Global Patent Index - EP 0857855 B1

EP 0857855 B1 2002-09-11 - Downhole directional measurement system

Title (en)

Downhole directional measurement system

Title (de)

Bohrlochrichtungsmesssystem

Title (fr)

Système de mesure de la direction d'un puits de forage

Publication

EP 0857855 B1 (EN)

Application

EP 97300746 A

Priority

EP 97300746 A

Abstract (en)

[origin: EP0857855A1] A downhole directional measurement system to determine an inclination angle θ of a wellbore at a point in either a definable vicinity of the wellbore bottom or in a projected path of the wellbore. The system comprises: a first inclinometer (39) for measuring an inclination angle alpha , and producing an output signal indicative thereof, and a second inclinometer (80) for measuring an inclination angle beta , and producing an output signal indicative thereof. The system is capable of determining the inclination angle θ of the wellbore by extrapolation based upon said inclination angle alpha and said inclination angle beta . <IMAGE>

IPC 1-7 (main, further and additional classification)

E21B 47/022

IPC 8 full level (invention and additional information)

E21B 47/022 (2012.01)

CPC (invention and additional information)

E21B 47/022 (2013.01)

Designated contracting state (EPC)

FR GB NL

EPO simple patent family

EP 0857855 A1 19980812; EP 0857855 B1 20020911

INPADOC legal status


2017-05-31 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2017-03-01 [REG GB PE20] PATENT EXPIRED AFTER TERMINATION OF 20 YEARS

- Expiry date: 20170205

2016-05-31 [PGFP FR] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2016-01-25 [REG FR PLFP] FEE PAYMENT

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- Effective date: 20120901

2012-09-12 [REG NL V1] LAPSED BECAUSE OF NON-PAYMENT OF THE ANNUAL FEE

- Effective date: 20120901

2011-05-31 [PGFP NL] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2003-09-03 [26N] NO OPPOSITION FILED

- Effective date: 20030612

2003-03-21 [ET] FR: TRANSLATION FILED

2002-09-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): FR GB NL

2002-09-11 [REG GB FG4D] EUROPEAN PATENT GRANTED

2000-11-15 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000929

1999-04-28 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: FR GB NL

1999-04-28 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): FR GB NL

1998-10-21 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980820

1998-08-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): FR GB NL