Methods of cementing pipe in well bores and low density cement compositions therefor
First Claim
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1. A method of cementing pipe in a well bore penetrating a subterranean zone or formation which readily fractures at low hydrostatic pressures comprising the steps of:
- (a) providing a low density cement composition having enhanced compressive, tensile and bond strengths upon setting comprised of a hydraulic cement, sufficient water to form a slurry and hollow glass microspheres surface treated with a mixture of organosilane coupling agents present in an amount sufficient to produce a cement composition density in the range of from about 6 to about 12 pounds per gallon;
(b) placing said cement composition into the annulus between said pipe and the walls of said well bore; and
(c) allowing said cement composition to set therein.
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Abstract
The present invention provides methods of cementing pipe in well bores and low density cement compositions having enhanced compressive, tensile and bond strengths upon setting. The composition of the invention are basically comprised of a hydraulic cement, sufficient water to form a slurry and hollow glass microspheres surface treated with a mixture of organosilane coupling agents present in an amount sufficient to produce a cement composition density in the range of from about 6 to about 12 pounds per gallon.
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Citations
20 Claims
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1. A method of cementing pipe in a well bore penetrating a subterranean zone or formation which readily fractures at low hydrostatic pressures comprising the steps of:
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(a) providing a low density cement composition having enhanced compressive, tensile and bond strengths upon setting comprised of a hydraulic cement, sufficient water to form a slurry and hollow glass microspheres surface treated with a mixture of organosilane coupling agents present in an amount sufficient to produce a cement composition density in the range of from about 6 to about 12 pounds per gallon;
(b) placing said cement composition into the annulus between said pipe and the walls of said well bore; and
(c) allowing said cement composition to set therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of cementing pipe in a well bore penetrating a subterranean zone or formation which readily fractures at low hydrostatic pressures comprising the steps of:
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(a) providing a low density cement composition having enhanced compressive, tensile and bond strengths upon setting comprised of a hydraulic cement, sufficient water to form a slurry, hollow glass microspheres surface treated with a mixture of organosilane coupling agents present in an amount sufficient to produce a cement composition density of about 6 pounds per gallon, a gas present in an amount sufficient to foam said cement composition whereby said cement composition has a density of about 5 pounds per gallon or below and a mixture of foaming and foam stabilizing surfactants;
(b) placing said cement composition into the annulus between said pipe and the walls of said well bore; and
(c) allowing said cement composition to set therein. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification