[0001] The invention relates to a sealing tool for downhole sealing of a coiled tubing logging
plug. Additionally, the invention relates to a well system with such a sealing tool
and a method for downhole sealing of a coiled tubing logging plug. In addition, the
invention relates to a use of the sealing tool for sealing a coiled tubing logging
plug.
[0002] A deployment of an electrical submersible pump in an oil or water well is common
practice. Additionally, the use of an associated bypass-system is well known. The
bypass system was designed to allow access to a well below an electrical submersible
pump assembly in order that logging and/or well intervention operation could be performed
without the removal of the completion, thus enabling work to be carried out under
dynamic well conditions. Continual development of the system has maximized the operational
benefits and includes permanent downhole monitoring of the well parameter and electrical
submersible pump performance using the multi sensor system.
[0003] Bypass systems are available for an extensive range of casing weights and can be
supplied to suit all well environments, using a wide range of materials to suit individual
well chemistry and being internally coated to provide added protection and reduce
friction as required. Each bypass system is individually designed to provide the optimum
completion, affording full protection to the electrical submersible pump power cable
and auxiliary service lines whilst providing uninterrupted access to the well below
the electrical submersible pump.
[0004] Bypass-systems usually comprise a Y-Tool. The Y-Tool provides the facility by which
the electrical submersible pump assembly is deployed with bypass tubing to allow access
to the well in order that logging and/or intervention work may be carried out below
without retrieval of the completion. The Y-Tool provides a single connection to the
production string above and has a bypass connection below directly in line with the
production string to allow the passage of logging tools to the well below via the
bypass Tubing. The Y-tool comprises a fluid tubing and a further fluid tubing in which
the electrical submersible pump is arranged.
[0005] A further connection at the base of the Y-Tool allows the electrical submersible
pump assembly to be suspended. The Y-Tool has a groove on either side to allow the
passage of the electrical submersible pump power cable, or other auxiliary service
lines. These umbilicals are secured in the Y-Tool groove with clips thus ensuring
full protection during deployment. The internal profile of the Y-Tool is designed
to ensure a smooth flow path from electrical submersible pump discharge to production
tubing.
[0006] Bypass-systems are designed and built to suit specific well completion. A well completion
can be for example a cleanout logging operation and/or a means of running downhole
samplers below the electrical submersible pump on horizontal reservoir sections. For
performing such operations a coiled tubing logging plug is used.
[0007] The coiled tubing logging plug can be deployed in all standard bypass systems and
is used as a means of sealing between the fluid tubing, in particular a tubing nipple
bore, and the coiled tubing outside diameter. The plug can be used for various combinations
of coiled tubing strings and tubing nipple sizes. It is utilized successfully for
clean out operations, production logging runs and also as a means of running downhole
samplers below the electrical submersible pumps on horizontal reservoir sections.
[0008] The plug is attached to the coiled tubing string via a retaining sleeve and collets,
the latter being activated to a release position on engagement of the tubing nipple
profile.
[0009] On release of the retaining sleeve from the holding collets the plug is automatically
locked in the nipple profile. The plug cannot be released prior to engagement in the
nipple. Once locked in place the plug can only be released or unseated if the retaining
sleeve or sleeve is pulled into the plug from below and pin is sheared and/or a bottom
crossover shoulders the bottom edge of the collet lock on the coiled tubing plug.
This aligns up the collet locking fingers with the groove in the sleeve allowing them
to collapse and to unseat. Only if the tool string is pulled into the plug will it
be unseated.
[0010] When cleanout/logging operations are complete the electrical submersible pump is
switched off, and after a short period to allow equalization across the pump, the
tool string is pulled out of the hole. As the tool string with retaining sleeve or
sleeve or crossover engages the bottom of the plug, a pin is sheared and/or the bottom
crossover shoulders the bottom edge of the collet lock on the coiled tubing plug and
in turn allows the locking mechanism to collapse and the plug to be retrieved to surface
along with the tool string.
[0011] If the coiled tubing logging plug cannot be removed from the fluid tubing of the
bypass system, it is not possible to continue with the fluid extraction from the well.
It is necessary to remove the coiled tubing logging plug as otherwise a self-circulation
situation occurs in which the fluid is pumped within the bypass-system. This can lead
to self-circulating problems and, thus, to a damage of the electrical submersible
pump.
[0012] In such situations it is known to stop the fluid extraction and exchange the bypass-system
including the stuck coiled tubing logging plug. Said operation leads to high costs
for the company due interrupting the fluid extraction.
[0013] The object of the invention is to reduce the costs for situations in which the coiled
tubing logging plug cannot be removed from the fluid tubing.
[0014] The object is solved by a sealing tool for downhole sealing of a coiled tubing logging
plug, wherein the sealing tool comprises a sealing body that is configured to be removably
insertable into a through-hole of the coiled tubing logging plug and formed to prevent
a fluid flow through the through-hole of the coiled tubing logging plug, wherein the
sealing body has an outer contour that at least partially is complementary in form
with the through-hole of the coiled tubing logging plug.
[0015] Another object of the invention is to provide a method to reduce costs for situations
in which the coiled tubing logging plug cannot be removed from the fluid tubing.
[0016] The invention is solved by a method for downhole sealing of a coiled tubing logging
plug comprising the step of inserting an inventive sealing tool into a through-hole
of the coiled tubing logging plug.
[0017] According to the invention it was recognized that the provision of the inventive
sealing tool prevents the need to exchange the bypass-system. In particular, it has
been recognized that by provision of the sealing tool the fluid tubing of the bypass-system
can be sealed so that the fluid extraction operation can be performed by the electrical
submersible pump without the risk that a self-circulation situation will occur. In
particular, it was recognized that the coiled tubing logging plug cannot be removed
from the fluid tubing as a pin could not be sheared and/or the bottom crossover could
not shoulder the bottom edge of the collet lock on the coiled tubing plug and in turn
unlock the locking mechanism so that the plug cannot be retrieved or removed and remains
in its position. Thus, it is possible to insert the sealing tool into the coiled tubing
logging plug in order to seal the fluid tubing. In the end high costs can be saved
by avoiding the exchange of the bypass-system due to insertion of the sealing tool
into the through-hole of the coiled tubing logging plug.
[0018] According to the invention the sealing body is configured to be removably insertable
into a through-hole of the coiled tubing logging plug. This means, the sealing body
and the coiled tubing logging plug are separate components wherein the sealing body
can be inserted into the coiled tubing logging plug if it is needed. Additionally,
the sealing body can be removed from the coiled tubing logging plug if the operator
wants to unseal the fluid tubing of the bypass-system in order to access a well bore
below the fluid tubing into the lower completion.
[0019] The sealing body is formed such that it prevents a fluid flow through the through-hole
of the coiled tubing logging plug. This means, no fluid can flow from the fluid tubing
of the bypass-system through the coiled tubing logging plug arranged in the fluid
tubing into e.g. a production tubing fluidically connected to the bypass-system. Thereto,
at least a part of the outer contour of the sealing body is configured such that it
has a complementary form with a part of the through hole of the coiled tubing logging
plug. That means, the outer contour of said part of the sealing body is in contact
with an inner part of the coiled tubing logging plug such that no fluid, in particular
liquid, can pass through between said part of the sealing body and the part of the
coiled tubing logging plug.
[0020] Downhole sealing means that the sealing tool is adapted that the coiled tubing plug
can be sealed when it is arranged downhole in a fluid tubing of e.g. the bypass-system
in which the electrical submersible pump is arranged. The fluid can be a gas or liquid.
The liquid can be oil or water.
[0021] According to an embodiment of the invention the sealing body can be made from bulk
or solid material. In particular, the sealing body can be made from bulk or solid
material such that no fluid can flow through the sealing body. Thus, no fluid can
flow along the axial direction of the sealing tool between an end of the sealing tool
directed to the production tubing and another end offset to the producing tubing.
In the end, an easy shaped and formed sealing tool can be provided in order to ensure
the sealing function.
[0022] The sealing tool does not have any external ports or a meaning for hydraulics fluids
movement to enter through the tool or interact with parts of the coiled tubing logging
plug. The sealing tool does not have any fluid chambers to help release the collects
from the engagement area of the coiled tubing logging plug. Additionally, the sealing
tool does not allow annulus flow around it to pass through the coiled tubing plug
due to the fact that it generates a seal in the upper sub of the coiled tubing plug.
In addition, the sealing tool does not have any holes, ports or cavities so that no
fluid, in particular liquid, can pass through the tool. This is not possible as the
tool is from bulk or solid material. The sealing tool can be used to seal an upper
end of the coiled tubing logging plug.
[0023] The sealing body can have at least partially a cylindrical shape. As mentioned above,
the sealing body has an outer contour that at least partially is complementary in
form with the through-hole of the coiled tubing logging plug. Thus, it is ensured
that the sealing body can be inserted into the through hole of the coiled tubing logging
plug and to seal the coiled tubing logging plug.
[0024] The sealing body can comprise a first sealing body portion and a second sealing body
portion wherein the diameter of the first sealing body portion differs from the diameter
of the second sealing body portion. The diameter of the first sealing body portion
can be greater than the diameter of the second sealing body portion. The fist sealing
body portion can have a diameter in the range of 3,257 to 5,210 cm. The second sealing
body portion can have a diameter in the range of 3,175 to 5,080 cm.
[0025] The first sealing body portion and the second sealing body portion can be arranged
adjacent to each other along the axis of the sealing tool. For sealing the coiled
tubing logging plug the sealing tool passes through sections of the coiled tubing
logging plug that have different inner diameters. The sealing tool enables to seal
the coiled tubing logging plug at two sections of the coiled tubing logging plug having
different inner diameter. This is possible as the outer contour of each of said two
sealing body portions is complementary with the form of the respective part of the
coiled tubing logging plug. The first sealing body portion can seal an upper part
of the coiled tubing logging plug. The upper part can comprise an end of the coiled
tubing logging plug. The second sealing body portion can seal another part of the
coiled tubing logging plug that is arranged lower than the upper part of the coiled
tubing logging plug. The other part of the coiled tubing logging plug can be arranged
between the ends of the coiled tubing logging plug. "upper" and "lower" refer to gravity
direction.
[0026] The sealing body can comprise a tapering end portion. The second sealing body portion
can be arranged closer to the tapering end portion than the first sealing body portion.
The tapering end portion can be arranged at the end of the sealing tool offset to
the production tubing. The tapering end portion, in particular a cross section of
the tapering end portion, can decrease in a direction directed away from the remaining
part of the sealing body, in particular the second sealing body portion. That means
the tapering end portion decreases in the direction away from the production tubing.
The tapering end portion can have a rounded nose. In particular, the nose can be arranged
at the tip of the tapering end portion.
[0027] The tapering end portion has the advantage that the sealing tool can easily be inserted
into the through hole of the coiled tubing logging plug. Additionally, the tapering
end portion has the advantage that it helps to push any debris or leftover from coiled
tubing logging cuttings after cutting the coiled tubing logging which is explained
below more in detail. The rounded nose also ensures that the coiled tubing logging
plug is not damaged when the sealing tool is inserted into the through-hole of the
coiled tubing logging plug.
[0028] The sealing body can comprises a fishing portion for fishing the sealing tool. As
fishing it is understood the operation of removing the sealing tool form the coiled
tubing logging plug. The fishing portion is the part of the sealing body which is
coupled with a fishing tool during the fishing operation. The fishing portion can
be arranged at another end of the sealing body. Thus, the fishing portion is arranged
at the other end of the sealing body that is proximal to the production tube and/or
is opposite to the tapering end portion.
[0029] The sealing tool can comprise at least one sealing element arranged on the sealing
body. In particular, the sealing tool can comprises several sealing elements that
are arranged on the sealing body and that are arranged adjacent to each other along
an axial direction of the sealing body. The sealing element can be an O-ring and/or
can extend in circumferential direction of the sealing body. In particular, the sealing
element can be arranged in a groove of the sealing body. The first sealing body portion
comprises at least one sealing element and/or the second sealing body portion comprises
at least one sealing element.
[0030] The sealing tool can comprise four sealing elements. Two sealing elements can be
arranged on the second sealing body portion and thus seal an upper sub of the coiled
tubing logging plug, in particular can seal a flow tube of the upper sub of the coiled
tubing logging plug. The remaining two sealing elements can be arranged at the first
sealing body portion.
[0031] The sealing tool can be fixed within the coiled tubing logging plug by means of a
form-fit or friction connection. The sealing body can comprise a fixing portion for
fixing the sealing tool with the coiled tubing logging plug wherein the fixing portion
has a higher roughness than the remaining portion of the sealing body. The fixing
portion is configured such that the connection between the sealing tool and the coiled
tubing logging plug does not release during normal operation due to e.g. pressure
differences within the bypass-system. However, the connection between the sealing
tool and the coiled tubing logging plug is released if a fishing tool is coupled with
the fishing portion of the sealing tool and acts a releasing force on the sealing
tool. By provision of the fixing portion the sealing tool can be connected with the
coiled tubing logging plug in an easy way ensuring that the connection does not unintentionally
release. The fixing portion can also seal the coiled tubing logging plug. In that
case the seal is realized by a metal to metal connection between the fixing portion
and an upper end of the coiled tubing logging plug.
[0032] After the sealing tool is inserted into through-hole of the coiled tubing logging
plug the fishing portion is arranged outside the through-hole. This means, the fishing
portion is not arranged inside the through-hole of the coiled tubing logging plug.
Thus, a fishing tool can easily be connected with the fishing portion of the sealing
tool.
[0033] According to an embodiment of the invention the sealing body can comprise a spacer
portion for preventing that a sealing element gets into contact with a tubing wall
during the movement of the sealing tool towards the coiled tubing logging plug. Thus,
it can be prevented in an easy way that the sealing element or sealing elements is
or are damaged when the sealing tool is moved towards the coiled tubing logging plug
in order to insert the sealing tool into the coiled tubing logging plug. The spacer
portion can be arranged between the at least one sealing element and the fishing portion
of the sealing body. The tubing wall can be the wall of the production tubing.
[0034] The spacer portion can have a greater outer contour than the remaining part of the
sealing body. In particular, the diameter of the spacer portion can be greater than
the diameter of the remaining part of the sealing body. Thus, it can be secured in
an easy way that the sealing element does not contact the tubing wall. The spacer
portion can have a greater dimension than the through-hole of the coiled tubing logging
plug. Thus, the spacer portion is not inserted into the through-hole of the coiled
tubing logging plug but is arranged outside the through hole. That means, a part of
the sealing tool is arranged inside the through hole of the coiled tubing logging
plug whereas the spacer portion is arranged outside the coiled tubing logging plug.
As the spacer portion is arranged outside the through-hole it can also be used for
fishing the sealing tool for the case that the fishing portion is damaged and/or cannot
be coupled with the fishing tool. The spacer portion does not come in contact with
the coiled tubing logging plugwhen the sealing tool is inserted into the coiled tubing
logging plug.
[0035] A particular advantageous sealing tool is achieved if a distance between the spacer
portion and a seating part of the tapering end portion is between 50% to 90% of the
complete length of the sealing body. By choosing said length it can be secured that
the sealing element does not come in contact with the tubing wall. The length of the
sealing tool is its extension in axial direction of the sealing tool. The seating
part of the tapering end portion is the end of the tapering end portion that is directed
to the remaining part of the sealing body and that comes in contact with the tubing
wall during the movement of the sealing tool in e.g. the production tubing.
[0036] Of particular advantage is a well system comprising the coiled tubing logging plug
and a sealing tool according to the invention. The sealing tool is arranged in the
through-hole of the coiled tubing logging plug in order to prevent a fluid flow through
the through-hole of the coiled tubing logging plug.
[0037] The well completion system comprises a bypass-system, wherein the coiled tubing logging
plug is located at a seating element of a fluid tubing of the bypass-system. That
means, the sealing tool is in direct contact with the coiled tubing logging plug and/or
is not in direct contact with the fluid tubing. In particular, the sealing of the
coiled tubing logging plug, in particular the sealing of the through hole, can merely
be achieved by the sealing tool. The seating element can be a part of the fluid tubing
that protrudes in a radial inner direction from the remaining part of the fluid tubing.
The well system can be fluidically connected with the production tubing.
[0038] The bypass-system comprises a further fluid tubing. A pump of the well system, in
particular an electrical submersible pump, can be arranged in the further fluid tubing
and/or can be fluidically connected with the further fluid tubing. The further fluid
tubing is arranged partially parallel to the fluid tubing. The two tubings are fluidically
connected at an upper and lower end with each other.
[0039] An outer contour of a cross section of the sealing body is smaller than an outer
contour of a cross section of the coiled tubing logging plug. In particular, an outer
diameter of the sealing body is smaller than an outer diameter of the coiled tubing
logging plug. Additionally, the outer diameter of the sealing body, in particular
the first sealing body portion and the second sealing body portion, is smaller than
an inner diameter of the fluid tubing. In other words, the sealing tool cannot seal
the fluid tubing. The same applies if the sealing tool is used in the further tubing
in which the electrical submersible pump is arranged. The sealing tool can be coaxially
arranged with the coiled tubing logging plug after the sealing tool is arranged in
the through hole of the coiled tubing logging plug.
[0040] In the following, the method for sealing the coiled tubing logging plug is described.
After it is determined that the coiled tubing logging plug is stuck and cannot be
removed from the bypass-system a tube passing through the coiled tubing logging plug
can be cut. The tube passes completely through the coiled tubing logging plug. The
coiled tubing logging plug is fixedly seated on a seating element of the fluid tubing.
[0041] As a result of the cutting step a part of the cut tube falls downward due to gravity
force. The remaining part of the cut tube can be removed in the next step. Afterwards,
the sealing tool is inserted into the producing tubing and moved towards the coiled
tubing logging plug. The sealing tool is moved such that it enters the through-hole
of the coiled tubing logging plug and seals it so that no fluid can flow through the
coiled tubing logging plug. In particular, the sealing tool can be moved such into
the coiled tubing logging plug so that the fixation portion is fixed with the coiled
tubing logging plug. Then, the sealing tool cannot be moved anymore relative to the
coiled tubing logging plug. After the coiled tubing logging plug is sealed the electrical
submersible pump can be activated so that it pumps the fluid through the bypass systems
towards the production tubing.
[0042] According to an example a tool running procedures can be done using coiled tubing
or wireline assembly tacking into account the connection of the fishing portion. Once
the fishing operations deemed unsuccessful then the sealing tool can be inserted in
the coiled tubing plug to seal it allowing the well to flow via ESP. The sealing tool
designed for specific oil producing wells with Y tool completion design (artificial
lift completion) and meant to seal the coiled tubing plug or to seal the flow through
coiled tubing plug and allow production through production tubing and ESP pump side.
[0043] In the figures, the subject-matter of the invention is schematically shown, wherein
identical or similarly acting elements are usually provided with the same reference
signs. Here shows:
- Fig. 1
- shows a perspective view of the sealing tool according to an embodiment of the invention,
- Fig. 2
- shows a cross section of the sealing tool shown in fig. 1 and inserted into a coiled
tubing logging plug,
- Fig. 3
- shows the movement of the sealing tool within a production tubing towards the coiled
tubing logging plug,
- Fig 4
- shows a part of a well system in a state in which the coiled tubing logging plug is
stuck,
- Fig. 5
- shows the well system according to fig. 3 during the tube cutting,
- Fig. 6
- shows the well system according to fig. 3 after the tube is cut,
- Fig. 7
- shows the well system according to fig. 3 after the sealing tool is inserted into
the through hole of the coiled tubing logging plug,
- Fig. 8
- shows a well system with a bypass-system, the sealing tool according to the embodiment
shown in fig. 1 and the coiled tubing logging plug.
[0044] Fig. 1 shows a perspective view of the sealing tool 1 according to the invention
and fig. 2 shows a cross section of the sealing tool 1 inserted in a coiled tubing
logging plug 2, wherein only a part of the coiled tubing logging plug 2 is shown in
fig. 2. The sealing tool 1 and the coiled tubing logging plug 2 are arranged coaxially
to each other when the sealing tool 1 is inserted in the coiled tubing logging plug
2 as is shown in fig. 2.
[0045] The sealing tool 1 shown in fig.1 and 2 is used for downhole sealing of the coiled
tubing logging plug 2 that is shown in fig. 2. The sealing tool 1 has a sealing body
4 that is configured to be removably inserted into a through-hole 5 of the coiled
tubing logging plug 2. Additionally, the sealing body is 4 is formed such to prevent
a fluid flow through the through hole 5 of the coiled tubing logging plug 2. In particular,
it is prevented that fluid can flow through the coiled tubing logging plug 2 along
the axial direction A of the sealing tool 1 when the sealing tool 1 is inserted into
the coiled tubing logging plug 2. The sealing body 4 has a fist sealing body portion
4a and a second sealing body portion 4b wherein the first sealing body portion 4a
and the second sealing body portion 4b are arranged adjacent to each other along the
axial direction of the sealing tool 1. The first sealing body portion 4a has a greater
diameter than the second sealing body portion 4b.
[0046] The sealing body 4 is formed from bulk or solid material preventing any fluid flow
from the through hole 5 along the axial direction A when the sealing tool 1 is inserted
in the coiled tubing logging plug 2. Additionally, the sealing body 4 comprises four
sealing elements 9 that extend in circumferential direction around the sealing body
4. The sealing elements 9 are arranged in grooves of the sealing body 4, respectively.
The sealing elements 9 are arranged adjacent to each other in axial direction A. Two
of the sealing elements 9 that are arranged on the second sealing body portion 4b
are in contact with an upper sub of the coiled tubing logging plug 2, in particular
of a flow tube of the upper sub of the coiled tubing logging plug 2. The remaining
two sealing elements 9 that are arranged on the first body portion 4a are in contact
with a metal portion of the coiled tubing logging plug 2, in particular an upper end
of the coiled tubing logging plug 2. Thus, it is secured by the sealing elements 9
that no fluid can flow between the sealing tool 1 and the coiled tubing logging plug
2 when the sealing tool 1 is inserted in the coiled tubing logging plug 2. As is evident
from fig. 2 the first sealing body portion 4a and the second sealing body portion
4b come in contact with different parts of the coiled tubing logging plug, in particular
with the upper part of the coiled tubing logging plug. Said parts of the coiled tubing
logging plug have different inner diameters.
[0047] The sealing body 4 comprises a tapering end portion 6 that is arranged at an end
of the sealing tool 1. The tapering end portion 6 comprises a rounded nose 7 and decreases
in a direction away from the sealing elements 9. The tapering end portion 6 comprises
a seating part 13 at the end of the tapering end portion 6 that is connected with
the remaining sealing body4, in particular with the second sealing body portion 4b.
[0048] The sealing body 4 comprises a fixing portion 10 that has a different roughness than
the remaining part of the sealing body 4. The fixing portion 10 is used for connecting
the sealing tool 1 with the coiled tubing logging plug 2 as it is shown in fig. 2.
In particular, the sealing tool 1 is connected with the upper sub of the coiled tubing
logging plug 2. The connection is made such that the sealing tool 1 cannot move relative
to the coiled tubing logging plug 2. The fixing portion 10 is arranged at an end of
the first sealing body portion 4a that is distant to the second sealing body portion
4b.
[0049] The sealing tool 1 comprises a fishing portion 8 that is arranged at another end
of the sealing tool 1. In particular, the fishing portion 8 and the tapering end portion
6 are arranged at opposite ends of the sealing tool 1. The fishing portion 8 is connected
with a non-shown fishing tool if the connection between the sealing tool 1 and the
coiled tubing logging plug 2 shall be released. The fishing portion 8 remains outside
the coiled tubing logging plug 2 when the sealing tool 1 is inserted in the coiled
tubing logging plug 2.
[0050] The sealing body 4 comprises a spacer portion 11 that is arranged between the fishing
portion 8 and the sealing element 9. The spacer portion 11 has a greater diameter
than the remaining part of the sealing body 4. As can be seen in fig. 2 the spacer
portion 11 remains outside the through-hole 5 when the sealing body 4 is inserted
into the through-hole 5 of the coiled tubing logging plug 2. The distance between
the spacer portion 11 and the seating part 13 is so large that it is secured that
the sealing element 9 does not contact any tubing wall 12 when the sealing tool 1
is moved through the production tube 21.
[0051] The sealing body 4 including the spacer portion 11, the fishing portion 8, the fixing
portion 10 and the tapering end portion 6 is formed as one piece component. That means
said portions cannot be removed from each other without destroying the sealing body
4.
[0052] Fig. 3 shows the movement of the sealing tool 1 within a production tubing 21 towards
the coiled tubing logging plug 2 shown in fig. 2. The sealing tool 1 is moved along
an insertion direction I towards the non-shown coiled tubing plug 2. A non-shown tool
is provided that moves the sealing tool 1 towards the coiled tubing plug 2 within
the production tubing 21.
[0053] As is evident from fig. 3 the spacer portion 11 and the seating part 13 are in contact
with a tubing wall 12 of the production tubing 21. The sealing tool 1 is designed
such that the distance between the spacer portion 11 and the seating part 13 along
the axial direction of the sealing tool 1 is so long that the sealing elements 9 do
not come in contact with the tubing wall 12.
[0054] In the following, the method for sealing the coiled tubing logging plug 2 by means
of the sealing tool 1 is described. The method is described under usage of fig. 4
to 7.
[0055] Fig 4 shows a part of a well system 3 in a state in which the coiled tubing logging
plug 2 is stuck. This means that the connection between the coiled tubing logging
plug 2 and a fluid tubing 16 cannot be released so that the coiled tubing logging
plug 2 cannot be moved in removal direction R.
[0056] The coiled tubing logging plug 2 seats on a seating element 15 of the fluid tubing
16. A tube 19 extends through the complete coiled tubing logging plug 2, in particular
through the through-hole 5 of the coiled tubing logging plug 2. Fig. 4 shows only
a part of the tube 19.
[0057] After, it has been determined that the coiled tubing logging plug 2 is stuck, the
tube 19 is cut. The tube 19 can be cut at a portion that is arranged above the coiled
tubing logging plug 2. Fig. 5 shows the cutting position 20 at which the tube 19 is
cut.
[0058] One part of the cut tube 19 falls downwards due to gravitationally force. This part
is shown in Fig. 6 whereas the other cut tube part has been removed by moving it along
the removal direction R. Afterwards, the sealing tool 1 is inserted into the through-hole
5 of the coiled tubing logging plug 2 as it is shown in fig. 7. Thereto, the sealing
tool 1 has been moved along the insertion direction I.
[0059] Fig. 8 shows a well system 3 with a bypass-system 14, the sealing tool 1 and the
coiled tubing logging plug 2. The sealing tool 1 is arranged inside the coiled tubing
logging plug 2.
[0060] The bypass-system 14 comprises a Y-tool. The Y-tool comprises the fluid tubing 16
discussed above. Additionally, the bypass-system 14 comprises a further fluid tubing
17 that is arranged parallel to the fluid tubing 16. A pump 18 is arranged in the
further fluid tubing 17 wherein the pump 18 can be an electrical submersible pump.
The bypass-system 14 is fluidically connected with the production tubing 21.
[0061] The sealing tool 1 has an outer contour, in particular such a diameter, that there
is always a fluid connection between the production tubing 21 and the further fluid
tubing 17. However, the sealing tool 1 seals the fluid tubing 16 by sealing the coiled
tubing logging plug 2 so that there is no fluidic connection between the fluid tubing
16 and the production tubing 21 via the coiled tubing logging plug 2. As is evident
from fig. 8, the spacer portion 11 is arranged on one end of the coiled tubing logging
plug 2 and thus is not arranged within the through hole 5.
Reference signs
[0062]
- 1
- sealing tool
- 2
- coiled tubing logging plug
- 3
- well completion system
- 4
- sealing body
- 4a
- first sealing body portion
- 4b
- second sealing body portion
- 5
- through hole
- 6
- tapering end portion
- 7
- rounded nose
- 8
- fishing portion
- 9
- sealing element
- 10
- fixing portion
- 11
- spacer portion
- 12
- tubing wall
- 13
- seating part
- 14
- bypass-system
- 15
- seating element
- 16
- fluid tubing
- 17
- further fluid tubing
- 18
- pump
- 19
- tube
- 20
- cutting position
- 21
- production tubing
- A
- axial direction
- I
- insertion direction
- R
- removal direction
1. Sealing tool (1) for downhole sealing of a coiled tubing logging plug (2), wherein
the sealing tool (1) comprises a sealing body (4) that is configured to be removably
insertable into a through-hole (5) of the coiled tubing logging plug (2) and formed
to prevent a fluid flow through the through-hole (5) of the coiled tubing logging
plug (2), wherein the sealing body (4) has an outer contour that at least partially
is complementary in form with the through-hole (5) of the coiled tubing logging plug
(2).
2. Sealing tool (1) according to claim 1,
characterized in that
a. the sealing body (4) is made from bulk or solid material or
b. the sealing body (4) is made from bulk or solid material such that no fluid can
flow through the sealing body (4).
3. Sealing tool (1) according to according to claim 1 or 2, characterized in that the sealing body (4) comprises a tapering end portion (6).
4. Sealing tool (1) according to claim 3,
characterized in that
a. the tapering end portion (6) decreases in a direction directed away from the remaining
part of the sealing body (4) and/or in that
b. the tapering end portion (6) has a rounded nose (7).
5. Sealing tool (1) according to at least one of the claims 1 to 4,
characterized in that
a. the sealing tool (1) comprises at least one sealing element (9) arranged on the
sealing body (4) or in that
b. the sealing tool (1) comprises several sealing elements (9) that are arranged on
the sealing body (4) and are arranged adjacent to each other along an axial direction
(A) of the sealing body (4) and/or in that
c. the sealing body (4) comprises a first sealing body portion (4a) and a second sealing
body portion (4b) wherein the diameter of the first sealing body portion (4a) differs
from the diameter of the second sealing body portion (4b).
6. Sealing tool (1) according to at least one of the claims 1 to 5, characterized in that the sealing body (4) comprises a fixing portion (10) for fixing the sealing tool
(1)with the coiled tubing logging plug (2) wherein the fixing portion (10) has a higher
roughness than the remaining portion of the sealing body (4).
7. Sealing tool (1) according to at least one of the claims 1 to 6, characterized in that the sealing body (4) comprises a spacer portion (11) for preventing that a sealing
element (9) gets into contact with a tubing wall (12) during the movement of the sealing
tool (1) towards the coiled tubing logging plug (2).
8. Sealing tool (1) according to claim 7
characterized in that
a. the spacer portion (11) has a greater outer contour than the remaining part of
the sealing body (4) and/or in that
b. the spacer portion (11) is arranged between the at least one sealing element (9)
and the fishing portion (8) of the sealing body (4) and/or in that
c. a distance between the spacer portion (11) and a seating part (13) of the tapering
end portion (6) is between 50% to 90% of the complete length of the sealing body (4).
9. Well system (3) comprising a coiled tubing logging plug (1) and a sealing tool (1)
according to one of the claims 1 to 8, wherein the sealing tool (1) is arranged in
a through-hole (5) of the coiled tubing logging plug (2) in order to prevent a fluid
flowthrough the through-hole (5) of the coiled tubing logging plug (2).
10. Well system (3) according to claim 9,
characterized in that
a. the well system (3) comprises a bypass-system (14), wherein the coiled tubing logging
plug (2) is located at a seating element (15) of a fluid tubing (16) of the bypass-system
(14) and/or in that
b. the sealing tool (1) is in direct contact with the coiled tubing logging plug (2).
11. Well system (3) according to claim 9 or 10,
characterized in that
a. an outer contour of a cross section of the sealing body (4) is smaller than an
outer contour of a cross section of the coiled tubing logging plug (2) and/or in that
b. an outer diameter of the sealing body (4) is smaller than an outer diameter of
the coiled tubing logging plug (2) and/or in that
c. an outer diameter of the sealing body (4) is smaller than an inner diameter of
the fluid tubing (16).
12. Well system (3) according to at least one of the claims 9 to 11, characterized in that the spacer portion (11) is arranged outside the coiled tubing logging plug (2) when
the sealing tool (1) prevents a fluid flow through the through hole (5) of the coiled
tubing logging plug (2).
13. Method for downhole sealing of a coiled tubing logging plug (2) comprising the step
of inserting a sealing tool (1) according to one of the claims 1 to 8 into a through-hole
(5) of the coiled tubing logging plug (2).
14. Method according to claim 13, characterized in that a tube (19) passing through the coiled tubing logging plug (2) is cut before the
sealing tool (1) is inserted.
15. Use of the sealing tool according to at least one of the claims 1 to 8 for sealing
a coiled tubing logging plug (2).
Amended claims in accordance with Rule 137(2) EPC.
1. Sealing tool (1) for downhole sealing of a coiled tubing logging plug (2), wherein
the sealing tool (1) comprises a sealing body (4) that is configured to be removably
insertable into a through-hole (5) of the coiled tubing logging plug (2) and formed
to prevent a fluid flow through the through-hole (5) of the coiled tubing logging
plug (2), wherein
the sealing body (4) has an outer contour that at least partially is complementary
in form with the through-hole (5) of the coiled tubing logging plug (2), wherein
the sealing body (4) comprises a spacer portion (11) for preventing that a sealing
element (9) gets into contact with a tubing wall (12) during the movement of the sealing
tool (1) towards the coiled tubing logging plug (2), wherein the spacer portion (11)
is configured such to have a greater diameter than the through-hole of the coiled
tubing logging plug (2) wherein
the sealing body (4) comprises a first sealing body portion (4a) comprising at least
one sealing element and a second sealing body portion (4b) comprising at least one
sealing element, wherein the diameter of the first sealing body portion (4a) differs
from the diameter of the second sealing body portion (4b).
2. Sealing tool (1) according to claim 1,
characterized in that
a. the sealing body (4) is made from bulk or solid material or
b. the sealing body (4) is made from bulk or solid material such that no fluid can
flow through the sealing body (4).
3. Sealing tool (1) according to according to claim 1 or 2, characterized in that the sealing body (4) comprises a tapering end portion (6).
4. Sealing tool (1) according to claim 3,
characterized in that
a. the tapering end portion (6) decreases in a direction directed away from the remaining
part of the sealing body (4) and/or in that
b. the tapering end portion (6) has a rounded nose (7).
5. Sealing tool (1) according to at least one of the claims 1 to 4,
characterized in that
a. the sealing tool (1) comprises at least one sealing element (9) arranged on the
sealing body (4) or in that
b. the sealing tool (1) comprises several sealing elements (9) that are arranged on
the sealing body (4) and are arranged adjacent to each other along an axial direction
(A) of the sealing body (4).
6. Sealing tool (1) according to at least one of the claims 1 to 5, characterized in that the sealing body (4) comprises a fixing portion (10) for fixing the sealing tool
(1) with the coiled tubing logging plug (2) wherein the fixing portion (10) has a
higher roughness than the remaining portion of the sealing body (4).
7. Sealing tool (1) according to at least one of the claims claim 1 to 6
characterized in that
a. the spacer portion (11) has a greater outer contour than the remaining part of
the sealing body (4) and/or in that
b. the spacer portion (11) is arranged between the at least one sealing element (9)
and the fishing portion (8) of the sealing body (4) and/or in that
c. a distance between the spacer portion (11) and a seating part (13) of the tapering
end portion (6) is between 50% to 90% of the complete length of the sealing body (4).
8. Well system (3) comprising a coiled tubing logging plug (1) and a sealing tool (1)
according to one of the claims 1 to 7, wherein the sealing tool (1) is arranged in
a through-hole (5) of the coiled tubing logging plug (2) in order to prevent a fluid
flow through the through-hole (5) of the coiled tubing logging plug (2).
9. Well system (3) according to claim 8,
characterized in that
a. the well system (3) comprises a bypass-system (14), wherein the coiled tubing logging
plug (2) is located at a seating element (15) of a fluid tubing (16) of the bypass-system
(14) and/or in that
b. the sealing tool (1) is in direct contact with the coiled tubing logging plug (2).
10. Well system (3) according to claim 8 or 9,
characterized in that
a. an outer contour of a cross section of the sealing body (4) is smaller than an
outer contour of a cross section of the coiled tubing logging plug (2) and/or in that
b. an outer diameter of the sealing body (4) is smaller than an outer diameter of
the coiled tubing logging plug (2) and/or in that
c. an outer diameter of the sealing body (4) is smaller than an inner diameter of
the fluid tubing (16).
11. Well system (3) according to at least one of the claims 8 to 10, characterized in that the spacer portion (11) is arranged outside the coiled tubing logging plug (2) when
the sealing tool (1) prevents a fluid flow through the through hole (5) of the coiled
tubing logging plug (2).
12. Method for downhole sealing of a coiled tubing logging plug (2) comprising the step
of inserting a sealing tool (1) according to one of the claims 1 to 7 into a through-hole
(5) of the coiled tubing logging plug (2).
13. Method according to claim 12, characterized in that a tube (19) passing through the coiled tubing logging plug (2) is cut before the
sealing tool (1) is inserted.
14. Use of the sealing tool according to at least one of the claims 1 to 7 for sealing
a coiled tubing logging plug (2).