EP 3510233 B1 20220316 - EXTENDED DIRECTIONAL DRILLING
Title (en)
EXTENDED DIRECTIONAL DRILLING
Title (de)
ERWEITERTE DIREKTIONALE BOHRUNG
Title (fr)
PROLONGÉE DIRECTIONNEL FORAGE
Publication
Application
Priority
- DE 102016217313 A 20160912
- EP 2017072883 W 20170912
Abstract (en)
[origin: WO2018046757A2] The present invention relates to drilling (particularly horizontally) a borehole in ground. In order to provide an extension in particular in term of run length of a drilling in ground in comparison to conventional trenchless approaches, a buoyancy enhanced drillpipe module is proposed, comprising a pipe, a first and a second connection unit fixed to the respective ends of the pipe, the connection units each allowing a connection of the drillpipe module respectively with another drillpipe module, and a passage for drilling fluid, wherein at least in a part of the space between the first and second connection unit a buoyancy unit is provided, wherein, for a drilling fluid having a density in the range of 1.0 to 1.1 kg/l and/or a debris laden drilling fluid having a density in the range of 1.1 to 1. 5 kg/l, the buoyancy unit has a lower density than the drilling fluid and wherein the drillpipe module is dimensioned such a ratio between an absolute value of an effective weight force per meter of the drillpipe module in debris laden drilling fluid, with drilling fluid in the passage, and a total cross section of those elements of the drillpipe module that are due to transfer axial force is < 10,000 N/m³.
IPC 8 full level
E21B 7/04 (2006.01)
CPC (source: EP)
E21B 7/046 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2018046757 A2 20180315; WO 2018046757 A3 20180419; DK 3510233 T3 20220411; EP 3510233 A2 20190717; EP 3510233 B1 20220316
DOCDB simple family (application)
EP 2017072883 W 20170912; DK 17780629 T 20170912; EP 17780629 A 20170912