EP 0403025 A3 19910529 - METHOD OF DRILLING AND LINING A BOREHOLE
Title (en)
METHOD OF DRILLING AND LINING A BOREHOLE
Publication
Application
Priority
GB 8913647 A 19890614
Abstract (en)
[origin: EP0403025A2] A method of drilling and lining a borehole (1) comprises the steps of drilling a borehole while a drilling fluid (13) is circulated through the bores (4, 5) of a multibore drill pipe string and an over-retarded cement slurry (12) is kept substantially stationary in a pipe-formation annulus (11) surrounding said string (2), whereupon after retrieval of the drilling assembly from the borehole the cement (12) is allowed to set to an annular lining of solid cement alongside the borehole wall (1).
IPC 1-7
IPC 8 full level
E21B 21/12 (2006.01); E21B 33/138 (2006.01)
CPC (source: EP)
E21B 21/12 (2013.01); E21B 33/138 (2013.01)
Citation (search report)
- [A] EP 0305834 A2 19890308 - MTS MINITUNNELSYSTEME GMBH [DE]
- [A] EP 0229425 A2 19870722 - SHELL INT RESEARCH [NL]
- [A] US 4519452 A 19850528 - TSAO YUH-HWANG [US], et al
- [AD] US 4718503 A 19880112 - STEWART ROBERT B [NL]
- [AP] EP 0346961 A2 19891220 - SHELL INT RESEARCH [NL]
Designated contracting state (EPC)
DE GB NL
DOCDB simple family (publication)
EP 0403025 A2 19901219; EP 0403025 A3 19910529; EP 0403025 B1 19940831; CA 2018754 A1 19901214; CA 2018754 C 20040302; DE 69011972 D1 19941006; DE 69011972 T2 19950216; GB 8913647 D0 19890802
DOCDB simple family (application)
EP 90201532 A 19900613; CA 2018754 A 19900612; DE 69011972 T 19900613; GB 8913647 A 19890614