Process for controlling gas migration during well cementing
AssigneeHalliburton Energy Services, Inc.
InventorsBach Dao, Ewout Biezen, Jan Pieter Vijn, Thien Pham
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Abstract
The present invention provides a cement composition and a process for using the cement composition to inhibit gas migration from a subterranean zone into the cement. The process comprises displacing a gelling additive, preferably comprised within a cement composition, into a well bore such that the gelling additive passes into the subterranean zone, and allowing the gelling additive to form a crosslinked gel in the subterranean zone to inhibit gas migration from the subterranean zone. The crosslinked gel acts as a barrier to gas in the subterranean zone and thereby inhibits the gas from passing into the cement and forming flow channels therein before the cement can set.
Claims26
A process for inhibiting gas migration from a subterranean zone into a well bore cement, comprising:
- (a) displacing a cement composition comprising a cement and a gelling additive into a well bore such that the gelling additive migrates from the cement composition into the surrounding subterranean zone and then forms a barrier;
- and
- (b) allowing the gelling additive to form a crosslinked gel in the subterranean zone to inhibit gas migration from the subterranean zone into the cement.
A process for inhibiting gas migration from a subterranean zone into a well bore cement, comprising:
- (a) displacing a cement composition comprising a cement and a gelling additive into a well bore such that the gelling additive passes into the subterranean zone;
- and
- (b) allowing the gelling additive to form a crosslinked gel in the subterranean zone to inhibit gas migration from the subterranean zone into the cement,
- wherein the cement composition further comprises an organic gelling agent capable of crosslinking the gelling additive and wherein the gelling agent is selected from the group consisting of a polyalkyleneimine, a polyfunctional aliphatic amine, an aralkylamine, a heteroaralkylamine, and combinations thereof, and wherein the gelling additive is a copolymer of at least one non-acidic ethylenically unsaturated polar monomer and at least one ethylenically unsaturated ester.
A process for inhibiting gas migration from a subterranean zone into a well bore cement, comprising:
- (a) displacing a cement composition comprising a cement and a gelling additive into a well bore such that the gelling additive passes into the subterranean zone;
- and
- (b) allowing the gelling additive to form a crosslinked gel in the subterranean zone to inhibit gas migration from the subterranean zone into the cement, wherein the gelling additive is a polymerizable monomer comprising at least one water soluble hydroxy unsaturated carbonyl.
A process for inhibiting gas migration from a subterranean zone into a well bore cement, comprising displacing a gelling additive into a well bore such that the gelling additive migrates from the cement composition into the surrounding subterranean zone and then forms a barrier;
- and allowing the gelling additive to form a crosslinked gel in the subterranean zone to inhibit gas migration from the subterranean zone into the cement.
Dependencies are inferred from the claim text.