# US 11,898,415 B2 · Cement compositions and methods

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- Number: US 11,898,415 B2
- Document ID: US11898415B2
- Status: Granted
- Kind: B2
- Application number: 17/254,418
- Filed: 2019-06-28
- Published: 2022-05-05
- Granted: 2024-02-13
- Earliest claimed: 2018-07-02
- Assignees: Schlumberger Technology Corporation
- Applicants: Schlumberger Technology Corporation
- Inventors: Anatoly Vladimirovich Medvedev; Dominic Vincent Perroni; Laure Martin-Al-Khatib; Adam Ethan Keilers; Petr Kolchanov
- Web page: https://patentgrep.com/patent/US11898415B2

## CPC

- E21B 33/14: for cementing casings into boreholes
- C04B 28/02: containing hydraulic cements other than calcium sulfates
- C04B 28/04: Portland cements
- C09K 8/467: containing additives for specific purposes
- E21B 33/138: Plastering the borehole wall; Injecting into the formation
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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

## Abstract

Cement slurries are prepared that comprise water, a hydraulic cement and particles of an oil-absorbent material. The particles are present in an amount sufficient to alter a property of a non-aqueous drilling fluid. The cement slurry is placed in a subterranean well, whereupon the slurry contacts residual drilling fluid on casing and formation surfaces. The oil-absorbent material in the cement slurry may reduce the mobility of the drilling fluid, thereby improving zonal isolation.

## Claims

### Claim 1

A method for cementing a subterranean well, comprising:
preparing a cement slurry comprising water, a hydraulic cement and particles of an oil-absorbent material, wherein the particles absorb a non-aqueous component of a drilling fluid and alter rheological properties of the drilling fluid within the subterranean well, and wherein an amount of the oil-absorbent material particles varies, in portions of the cement slurry, between 0% by weight of the cement (BWOC) and 40% BWOC;
placing the cement slurry in the subterranean well and thereby creating a cement sheath in the subterranean well with a variable oil-absorbent material amount;
allowing the oil-absorbent material particles to contact the non-aqueous drilling fluid component, thereby altering the rheological properties of the drilling fluid and swelling the oil-absorbent material particles;
wherein the oil-absorbent material particles are elongated, having an aspect ratio between 1.1 and 2000 before the swelling and between 2.2 and 3500 after the swelling.

### Claim 2 (depends on 1)

The method of claim 1, wherein the oil-absorbent material comprises rubber, ground rubber, acrylonitrile butadiene, styrene butadiene, 2,1 bicycloheptene, alkylstyrene, or crosslinked substituted vinyl acetate copolymer, or combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the oil-absorbent material particles have a particle size between 1 μm and 850 μm.

### Claim 4 (depends on 1)

The method of claim 1, wherein the rheological properties of the drilling fluid altered by contact with the oil-absorbent material particles comprise flowability, and wherein the oil-absorbent material particles decrease the flowability of the drilling fluid.

### Claim 5 (depends on 1)

The method of claim 1, wherein the elongated particles interact in the subterranean well to form an interconnected network.

### Claim 6 (depends on 1)

The method of claim 1, wherein the oil-absorbent material particles are present in an amount between 5 lbm/bbl and 50 lbm/bbl.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cement slurry has a density between 10 lbm/gal and 24 lbm/gal.

### Claim 8 (depends on 1)

The method of claim 1, wherein the non-aqueous component comprises diesel, mineral oil, olefins, esters, synthetic paraffins, or refined paraffins, or combinations thereof.

### Claim 9

A method for establishing zonal isolation in a subterranean well, comprising:
preparing a cement slurry comprising water, a hydraulic cement, and particles of an oil-absorbent material, wherein the particles absorb a non-aqueous component of a residual drilling fluid present in the subterranean well along casing and formation surfaces thereof and alter rheological properties of the residual drilling fluid within the subterranean well, and wherein an amount of the oil-absorbent material particles varies, in portions of the cement slurry, between 0% by weight of the cement (BWOC) and 40% BWOC;
placing the cement slurry in the subterranean well and thereby creating a cement sheath in the subterranean well with a variable oil-absorbent material amount;
allowing the oil-absorbent material particles to contact the residual drilling fluid, thereby altering the rheological properties of the drilling fluid and swelling the oil-absorbent material particles, wherein the oil-absorbent material particles are elongated, having an aspect ratio between 1.1 and 2000 before the swelling and between 2.2 and 3500 after the swelling.

### Claim 10 (depends on 9)

The method of claim 9, wherein the oil-absorbent material comprises rubber, ground rubber, acrylonitrile butadiene, styrene butadiene, 2,1bicycloheptene, alkylstyrene, or crosslinked substituted vinyl acetate copolymer, or combinations thereof.

### Claim 11 (depends on 9)

The method of claim 9, wherein the oil-absorbent material particles have a particle size between 1 μm and 850 μm.

### Claim 12 (depends on 9)

The method of claim 9, wherein the rheological properties of the drilling fluid altered by contact with the oil-absorbent material particles comprise flowability, and wherein the oil-absorbent material particles decrease the flowability of the drilling fluid.

### Claim 13 (depends on 9)

The method of claim 9, wherein the elongated particles interact in the subterranean well to form an interconnected network.

### Claim 14 (depends on 9)

The method of claim 9, wherein the oil-absorbent material particles are present in an amount between 5 lbm/bbl and 50 lbm/bbl.

### Claim 15 (depends on 9)

The method of claim 9, wherein the cement slurry has a density between 10 lbm/gal and 24 lbm/gal.

### Claim 16 (depends on 9)

The method of claim 9, wherein the non-aqueous component comprises diesel, mineral oil, olefins, esters, synthetic paraffins, or refined paraffins, or combinations thereof.