Methods involving cements that employ carbon dioxide as a reactant
AssigneeOxy Low Carbon Ventures, LLC
InventorsKenneth M. Cowan, Robert L. Zeller, III, Elias R. Callahan, III, James S. Willis
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Abstract
A method of cementing an annular space between a pipe string and a well bore, the method comprising the steps of (a) providing a cement composition including a calcium-deficient calcium silicate; (b) mixing the cement composition with water to form a cement slurry; (c) mixing the cement slurry composition with carbon dioxide form a foamed cement; and (d) placing the foamed cement in the annular space between the pipe string and the wellbore.
Claims19
A method of cementing an annular space between a pipe string and a well bore, the method comprising steps of:
- (a) providing a calcium-deficient calcium silicate which has been subjected to a step of grinding such that the calcium-deficient calcium silicate consists of ground calcium silicate, wherein the ground calcium silicate has a median particle size of less than 200 μm;
- (b) preparing a cement composition including the calcium-deficient calcium silicate consisting of the ground calcium silicate having the median particle size of less than 200 μm;
- (c) mixing the cement composition with water to form a cement slurry;
- (d) mixing the cement slurry with carbon dioxide to form a foamed cement;
- and
- (e) placing the foamed cement in the annular space between the pipe string and the wellbore.
A process for cementing a pipe string within a well bore to form a carbon dioxide capture and sequestration region within a cement casing, where the pipe string has a generally tubular configuration with a surface opening and a downhole opening opposite the surface opening, and a generally annular space existing between the pipe string and the well bore;
- the method comprising:
- (a) providing a first cement composition including a calcium-deficient calcium silicate;
- (b) mixing the first cement composition with water to form a first cement slurry;
- (c) providing a second cement composition including a calcium-rich calcium silicate;
- (d) mixing the second cement composition with water to form a second cement slurry;
- (e) placing the first cement slurry into a portion of the annular space to form a first generally annular column including the first cement slurry;
- and
- (f) placing the second cement slurry into a portion of the annular space to form a second generally annular column including the second cement slurry, where said first generally annular column forms a carbon dioxide sequestration region.
A cemented production well including a carbon dioxide capture and sequestration region within a cement casing, the cemented production well comprising:
- (a) a well bore;
- (b) a pipe string within said well bore;
- (c) a generally annular column of cement within at least a portion of the space between the pipe string and the well bore;
- (d) a first generally annular region within the generally annular column of cement, said first generally annular region including a calcium-deficient calcium silicate, wherein said first generally annular region is a carbon dioxide sequestration region which is reactive to carbon dioxide, wherein the calcium-deficient calcium silicate consists of ground calcium silicate with a median particle size of less than 200 μm;
- and
- (e) a second generally annular region within the generally annular column of cement, said second generally annular region including a calcium-rich calcium silicate.
Dependencies are inferred from the claim text.