# US 2013/0153221 A1 · Compositions and Methods for Well Completions

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- Number: US 2013/0153221 A1
- Document ID: US20130153221A1
- Status: Published application
- Kind: A1
- Application number: 13/814,724
- Filed: 2010-08-18
- Published: 2013-06-20
- Earliest claimed: 2010-08-18
- Assignees: Schlumberger Technology Corporation
- Inventors: Anthony Loiseau; Alice Chougnet-Sirapian; Elena Tomilina; Simon Gareth James
- Web page: https://patentgrep.com/patent/US20130153221A1

## CPC

- C04B 14/00: Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone (expanding or defibrillating materials C04B20/00)
- C04B 28/02: containing hydraulic cements other than calcium sulfates
- C09K 8/467: containing additives for specific purposes
- E21B 33/14: for cementing casings into boreholes
- C04B 2111/32: Expansion-inhibited materials
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

Incorporation of carbonaceous materials in a cement slurry increases the linear thermal-expansion coefficient of the set cement. When placed in a subterranean well having at least one casing string, cement sheaths with linear thermal-expansion coefficients similar to that of the casing will be subjected to lower compressive and tensile stresses during downhole-temperature changes. Such cement slurries are particularly advantageous in the context of thermal-recovery wells.

## Claims

### Claim 1

A method for adjusting the linear thermal-expansion properties of a cement slurry for placement in a subterranean well having at least one casing string, comprising:
incorporating a carbonaceous material in the cement slurry, such that the linear thermal-expansion coefficient of the set cement is higher than that of a set cement not containing the carbonaceous material.

### Claim 2 (depends on 1)

The method of claim 1, wherein the linear thermal-expansion coefficient of the set cement comprising the carbonaceous material is higher than that of a set cement not containing the carbonaceous material but lower or equal to 50·10−6/° C.

### Claim 3 (depends on 1)

The method of claim 1, wherein the carbonaceous material is one or more members of the list comprising delayed coke, fluid coke, calcined coke, asphalt, charcoal, coal, anthracite, graphite, flake coke, amorphous pitch coke, anode coke, tar coke, metallurgical coke, amorphous graphite, lignite, bituminous coal, sub-bituminous coal, exinite, vitrinite, intertinite, gilsonite, fine kolite, needle coke and activated carbon.

### Claim 4 (depends on 1)

The method of claim 1, wherein the carbonaceous-material concentration is between about 10% and 60% by weight of cement.

### Claim 5 (depends on 1)

The method of claim 1, wherein the carbonaceous-material particle size is between about 1 μm and 1200 μm.

### Claim 6 (depends on 1)

The method of claim 1, wherein the subterranean well is a thermal-recovery well.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cement slurry further comprises silica in an amount of from 20% to 60% by weight of cement.

### Claim 8 (depends on 1)

The method of claim 1, wherein the cement slurry further comprises one or more members of the list comprising accelerators, retarders, dispersants, fluid-loss additives, extenders, swellable materials, pozzolans, fibers and antifoam agents.

### Claim 9 (depends on 1)

The method of claim 1, wherein the cement slurry density is adjusted by adding one or more members of the list comprising glass microspheres, ceramic microspheres, composite microsphere components hematite, ilmenite, barite and manganese tetraoxide.

### Claim 10

A method comprising, adjusting linear thermal-expansion properties of a set cement placed in a subterranean well having at least one casing string with a carbonaceous material, and controlling thermal and mechanical stresses exerted upon the cement sheath in the well.

### Claim 11 (depends on 10)

The method of claim 10, wherein the linear thermal-expansion coefficient of the set cement is higher than that of a set cement not containing the carbonaceous material, and lower than or equal to about 50·10−6/° C.

### Claim 12 (depends on 10)

The method of claim 10, wherein the carbonaceous material is one or more members of the list comprising delayed coke, fluid coke, calcined coke, asphalt, charcoal, coal, anthracite, graphite, flake coke, amorphous pitch coke, anode coke, metallurgical coke, amorphous graphite, lignite, bituminous coal, sub-bituminous coal, exinite, vitrinite, intertinite, gilsonite, fine kolite, needle coke and activated carbon.

### Claim 13 (depends on 10)

The method of claim 10, wherein the carbonaceous-material concentration is between about 10% and 60% by weight of cement.

### Claim 14 (depends on 10)

The method of claim 10, wherein the carbonaceous-material particle size is between about 1 μm and 1200 μm.

### Claim 15 (depends on 10)

The method of claim 10, wherein the subterranean well is a thermal-recovery well.

### Claim 16 (depends on 10)

The method of claim 10, wherein the cement slurry further comprises silica.

### Claim 17 (depends on 10)

The method of claim 10, wherein the silica concentration is between about 20% and about 60% by weight of cement.

### Claim 18 (depends on 10)

The method of claim 10, wherein the cement slurry further comprises one or more members of the list comprising accelerators, retarders, dispersants, fluid-loss additives, extenders, swellable materials, pozzolans, fibers and antifoam agents.

### Claim 19 (depends on 10)

The method of claim 10, wherein the cement-slurry density is adjusted by adding one or more members of the list comprising glass microspheres, composite microsphere components, ceramic microspheres, hematite, ilmenite, barite and manganese tetraoxide.

### Claim 20

A method for controlling thermal and mechanical stresses in a cement sheath in a subterranean well, comprising:
i. installing at least one casing string in the well,
ii. forming a cement slurry containing at least one carbonaceous material in a quantity sufficient such that the set cement has a linear thermal-expansion coefficient higher than that of a set cement not containing the carbonaceous material, and lower than or equal to about 50·10−6/° C.; and
iii. placing the cement slurry in the well, adjacent to the casing string, and allowing it to set.