Well cementing process and gasified cements useful therein
First Claim
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1. A cement composition for cementing an oil or gas well comprising(a) a hydraulic cement;
- (b) water;
(c) a gas generating composition selected from the group consisting of;
I. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof;
an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, potassium dichromate, and mixtures thereof; and
a reaction rate control material selected from the group consisting of sodium sulfate, calcium sulfate hemihydrate, copper sulfate hemihydrate, copper sulfate, calcium hydroxide, and mixtures thereof;
II. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof;
an oxidizing agent selected from the group consisting of calcium peroxide, zinc peroxide, and mixtures thereof; and
,a reaction rate control material comprising copper sulfate;
III. a nitrogen gas generating material selected from the group consisting of an ammonium salt of an organic or inorganic acid, hydroxylamine sulfate, carbamide, azodicarbonamide, and mixtures thereof;
an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, and mixtures thereof;
a reaction rate control material comprising copper sulfate; and
,IV. a nitrogen gas generating material comprising azodicarbonamide;
an oxidizing agent comprising calcium peroxide; and
,a reaction rate control material comprising copper sulfate; and
,V. mixtures of I, II, III, or IV.
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Abstract
A composition for a method of cementing subterranean formations. The cementing composition comprises hydraulic cement, a nitrogen gas generating material, an oxidizing agent, and a reaction rate control material. The concentration of the nitrogen gas generating material is correlated with the pressure and temperature of the cement zone to be cemented so that the flow of gas from the formation into the borehole is suppressed or controlled.
189 Citations
20 Claims
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1. A cement composition for cementing an oil or gas well comprising
(a) a hydraulic cement; -
(b) water; (c) a gas generating composition selected from the group consisting of; I. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, potassium dichromate, and mixtures thereof; and a reaction rate control material selected from the group consisting of sodium sulfate, calcium sulfate hemihydrate, copper sulfate hemihydrate, copper sulfate, calcium hydroxide, and mixtures thereof; II. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of calcium peroxide, zinc peroxide, and mixtures thereof; and
,a reaction rate control material comprising copper sulfate; III. a nitrogen gas generating material selected from the group consisting of an ammonium salt of an organic or inorganic acid, hydroxylamine sulfate, carbamide, azodicarbonamide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, and mixtures thereof; a reaction rate control material comprising copper sulfate; and
,IV. a nitrogen gas generating material comprising azodicarbonamide; an oxidizing agent comprising calcium peroxide; and
,a reaction rate control material comprising copper sulfate; and
,V. mixtures of I, II, III, or IV. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A gas generating composition selected from the group consisting of:
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I. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, potassium dichromate, and mixtures thereof; and a reaction rate control material selected from the group consisting of sodium sulfate, calcium sulfate hemihydrate, copper sulfate hemihydrate, copper sulfate, calcium hydroxide, and mixtures thereof; II. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of calcium peroxide, zinc peroxide, and mixtures thereof; and
,a reaction rate control material comprising copper sulfate; III. a nitrogen gas generating material selected from the group consisting of an ammonium salt of an organic or inorganic acid, hydroxylamine sulfate, carbamide, azodicarbonamide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, and mixtures thereof; a reaction rate control material comprising copper sulfate; and
,IV. a nitrogen gas generating material comprising azodicarbonamide; an oxidizing agent comprising calcium peroxide; and
,a reaction rate control material comprising copper sulfate; and
,V. mixtures of I, II, III, or IV. - View Dependent Claims (11, 12)
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13. A method of cementing in an annulus between a well casing and a borehole comprising placing in said annulus a cement composition comprising a hydraulic cement, water, and a gas generating composition said gas generating composition selected from:
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I. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, potassium dichromate, and mixtures thereof; and a reaction rate control material selected from the group consisting of sodium sulfate, calcium sulfate hemihydrate, copper sulfate hemihydrate, copper sulfate, calcium hydroxide, and mixtures thereof; II. a nitrogen gas generating material selected from the group consisting of hydrazine, hydrazine sulfate, carbazide, and mixtures thereof; an oxidizing agent selected from the group consisting of calcium peroxide, zinc peroxide, and mixtures thereof; and
,a reaction rate control material comprising copper sulfate; III. a nitrogen gas generating material selected from the group consisting of an ammonium salt of an organic or inorganic acid, hydroxylamine sulfate, carbamide, azodicarbonamide, and mixtures thereof; an oxidizing agent selected from the group consisting of hydrogen peroxide, sodium peroxyborate tetrahydrate, sodium peroxyborate monohydrate, and mixtures thereof; a reaction rate control material comprising copper sulfate; and
,IV. a nitrogen gas generating material comprising azodicarbonamide; an oxidizing agent comprising calcium peroxide; and
,a reaction rate control material comprising copper sulfate; and
,V. mixtures of I, II, III, or IV. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification