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US 2016/0096988 A1Published application
Methods for Servicing Subterranean Wells
AssigneeSchlumberger Technology Corporation
InventorsLijun Lin, Quanxin Guo, Brent Busby, Philip F. Sullivan
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Abstract
Pumpable process-fluid compositions comprise polyacrylamide, a non-metallic crosslinker and a pH-adjustment material. Such compositions have utility in the context of controlling lost circulation in subterranean wells. Upon entering at least one lost circulation zone, the compositions crosslink, thereby forming a barrier that minimizes or stops fluid flow from the wellbore into the lost circulation zone.
Claims8
A method for controlling lost circulation in a subterranean well having at least one lost circulation zone, comprising:
- i. preparing a process fluid composition comprising at least 1 wt % polyacrylamide, a non-metallic crosslinker and a pH adjustment agent;
- ii. allowing crosslinking of the polyacrylamide to take place;
- iii. freeze drying the crosslinked composition;
- iv. pumping the composition down the wellbore and into at least one lost circulation zone;
- and
- v. exposing the composition to water in the lost circulation zone, thereby hydrating and thickening the freeze dried composition, thereby blocking the lost circulation zone;
- wherein, the non-metallic crosslinker comprises a polylactam.
4 more elements
Dependencies are inferred from the claim text.