Title:
COMPOSITIONS AND METHODS FOR TREATING LOST CIRCULATION
Document Type and Number:
WIPO Patent Application WO2004101463
Kind Code:
B1
Abstract:
A cement system for use in treating lost circulation includes a slurry of cement, water and a super-absorbent polymer which absorbs free water in the slurry to form a gel - ore preferably a solid-like structure - when placed in the well, and which releases the absorbed water to the cement hydration reaction as the cement sets. The absorption of water causes the slurry to develop a solid-like structure. In one embodiment, the superabsorbent is polyacrylamide or modified crosslinked poly(meth)acrylate. Also presented is a method of treating lost circulation by pumping the above-mentioned cement system.
Inventors:
ZUSATZ BENEDICTE (FR)
NILSSON FREDERIK (FR)
NILSSON FREDERIK (FR)
Application Number:
PCT/EP2004/005124
Publication Date:
February 17, 2005
Filing Date:
May 12, 2004
Export Citation:
Assignee:
SCHLUMBERGER SERVICES PETROL (FR)
SCHLUMBERGER TECHNOLOGY BV (GB)
SCHLUMBERGER HOLDINGS (VG)
SCHLUMBERGER CA LTD (CA)
SOFITECH NV (BE)
ZUSATZ BENEDICTE (FR)
NILSSON FREDERIK (FR)
SCHLUMBERGER TECHNOLOGY BV (GB)
SCHLUMBERGER HOLDINGS (VG)
SCHLUMBERGER CA LTD (CA)
SOFITECH NV (BE)
ZUSATZ BENEDICTE (FR)
NILSSON FREDERIK (FR)
International Classes:
C04B28/02; C04B40/06; C09K8/467; (IPC1-7): E21B33/13; C04B28/00
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