Methods and compositions for forming permeable cement sand screens in wells
AssigneeHalliburton Energy Services, Inc.
InventorsPhilip D. Nguyen, David L. Brown, Johnny A. Barton
Life of this patent
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Abstract
Methods of forming a permeable cement composition in a well bore adjacent to a fluid producing zone therein and cement compositions for forming permeable cement sand screens in well bores are provided. A cement composition of the invention is comprised of a hydraulic cement, a particulate cross-linked aqueous gel having a size in the range of from about 100 microns to about 3000 microns containing an internal temperature activated breaker, a particulate dehydrated cross-linked aqueous gel having a size in the range,of from about 40 microns to about 500 microns containing an internal temperature activated breaker and water present in an amount sufficient to form a slurry.
Claims33
A method of forming a permeable cement composition sand screen in a well bore adjacent to a fluid producing zone therein comprising the steps of:
- (a) preparing a cement composition comprised of a hydraulic cement, a particulate cross-linked aqueous gel having a size in the range of from about 100 microns to about 3000 microns containing an internal temperature activated breaker which causes said gel to break into a liquid, a particulate dehydrated cross-linked aqueous gel having a size in the range of from about 40 microns to about 500 microns containing an internal temperature activated breaker which causes said gel to break into a liquid, and water present in an amount sufficient to form a slurry;
- (b) placing said cement composition prepared in step (a) in said well bore adjacent to said fluid producing zone therein and allowing said cement composition to set and said particulate cross-linked aqueous gels containing internal temperature activated breakers to break whereby a permeated set cement composition is formed in the fluid producing zone in said well bore;
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- (c) introducing an aqueous acid solution into contact with said permeated set cement composition whereby the aqueous acid solution flows through the permeations in said set cement composition and dissolves any portions of said set cement composition blocking said permeations.
A method of forming a permeable cement composition sand screen in a cased well bore adjacent to an open-hole fluid producing zone therein below the casing comprising the steps of:
- (a) placing an expandable slotted pipe in said fluid producing zone;
- (b) expanding said slotted pipe to the size of said casing in said well bore;
- (c) preparing a cement composition comprised of a hydraulic cement, a particulate cross-linked aqueous gel having a size in the range of from about 100 microns to about 3000 microns containing an internal temperature activated breaker which causes said gel to break into a liquid, a particulate dehydrated cross-linked aqueous gel having a size in the range of from about 40 microns to about 500 microns containing an internal temperature activated breaker which causes said gel to break into a liquid, and water present in an amount sufficient to form a slurry;
- (d) placing said cement composition prepared in step (c) in said well bore adjacent to said fluid producing zone within said expanded slotted pipe therein, between said expanded slotted pipe and said open-hole well bore and within voids or fractures in said producing zone;
- (e) allowing said cement composition to set and said particulate cross-linked aqueous gels containing internal temperature activated breakers to break whereby a permeated set cement composition is formed in said open-hole producing zone;
- (f) drilling out said set cement composition within said expanded slotted pipe;
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- (g) introducing an aqueous acid solution into contact with said permeated set cement composition whereby the aqueous acid solution flows through the permeations in said set cement composition and dissolves any portions of said set cement composition blocking said permeations.
Dependencies are inferred from the claim text.