Title:
FILTER CAKE CLEANUP AND GRAVEL PACK METHODS FOR OIL BASED OR WATER BASED DRILLING FLUIDS
Document Type and Number:
WIPO Patent Application WO2001061148
Kind Code:
A3
Abstract:
A method is disclosed of gravel packing a wellbore which has at least one aperture therein that provides a fluid flow path between the wellbore and an adjacent subterranean formation. At least a part of the formation adjacent to the open hole has a filter cake coated thereon that comprises a water and oil emulsion. The method of gravel packing comprises injecting into the wellbore a gravel pack composition that comprises gravel and a carrier fluid. The carrier fluid comprises an aqueous liquid having a pH that is outside the range at which the filter cake emulsion is stable. The aqueous liquid is present in an amount effective to invert the water in ooil emulsion in the filter cake when the carrier fluid comes into contact with the filter cake. As a result, gravel is deposited at or adjacent to the aperture in the wellbore and some of the filter cake is removed. The ramainder of the filter cake and the carrier fluid can be broken simultaneously by contact with a breaker fluid that contains at least one of a surfactant and a mutual solvent.
Inventors:
PARLAR MEHMET
PRICE-SMITH COLIN
TIBBLES RAYMOND J
KELKAR SHRIHARI
BRADY MARK E
MORRIS ELIZABETH W A
PRICE-SMITH COLIN
TIBBLES RAYMOND J
KELKAR SHRIHARI
BRADY MARK E
MORRIS ELIZABETH W A
Application Number:
PCT/EP2001/001697
Publication Date:
March 21, 2002
Filing Date:
February 15, 2001
Export Citation:
Assignee:
SOFITECH NV (BE)
SCHLUMBERGER CA LTD (CA)
COMPANIE DES SERVICES DOWELL S (FR)
SCHLUMBERGER CA LTD (CA)
COMPANIE DES SERVICES DOWELL S (FR)
International Classes:
C09K8/52; E21B33/14; E21B34/14; E21B43/04; (IPC1-7): E21B37/08; E21B37/06
Domestic Patent References:
| WO2000040667A1 | 2000-07-13 |
Foreign References:
| US6143698A | 2000-11-07 | |||
| GB2338254A | 1999-12-15 |
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