# US 11,898,089 B2 · Use of granite waste powder in lightweight oilwell cement systems; strength analysis

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- Number: US 11,898,089 B2
- Document ID: US11898089B2
- Status: Granted
- Kind: B2
- Application number: 17/900,360
- Filed: 2022-08-31
- Published: 2023-09-14
- Granted: 2024-02-13
- Earliest claimed: 2022-03-09
- Assignees: King Fahd University of Petroleum and Minerals
- Applicants: King Fahd University of Petroleum and Minerals
- Inventors: Salaheldin Elkatatny; Stephen Adjei
- Web page: https://patentgrep.com/patent/US11898089B2

## CPC

- C09K 8/48: Density increasing or weighting additives
- C09K 8/5045: {containing inorganic compounds}
- C04B 14/06: Quartz; Sand
- C04B 14/104: {Bentonite, e.g. montmorillonite}
- C04B 14/18: Perlite
- C04B 14/308: {Iron oxide}
- C04B 18/12: from quarries, mining or the like
- C04B 22/124: {Chlorides of ammonium or of the alkali or alkaline earth metals, e.g. calcium chloride}
- C09K 8/467: containing additives for specific purposes
- C09K 8/473: Density reducing additives, e.g. for obtaining foamed cement compositions
- C04B 28/04: Portland cements
- C04B 2103/408: {Dispersants}
- C04B 2103/50: Defoamers, air detrainers
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A method for treating a well in a hydrocarbon-producing subterranean production zone. The method for treating well-producing hydrocarbons from a subterranean production zone includes dry mixing a granite waste powder (GWP) in a form of rock aggregates and a cement to form a mixture. Then the mixture is added to the cement composition containing water, pre-hydrated sodium bentonite, calcium chloride, a dispersant, and an alcohol-based defoamer to form a cement slurry. The cement slurry is prepared at a density of from 13.5 pounds per gallon (ppg) to 14.5 ppg and contains the GWP in a range of from 5 wt. % to 20 wt. % of the cement slurry. 10 wt. % to 15 wt. % perlite is added into the cement slurry to form a ternary blend which is cured and then the cured product is injected into the well to seal the well at the subterranean production zone.

## Claims

### Claim 1

A method for treating a well in a hydrocarbon-producing subterranean production zone, comprising:
dry mixing granite waste powder (GWP) and cement to form a mixture;
wherein the GWP has a D50 diameter of from 10 μm to 100 μm; and
mixing the mixture with an aqueous composition containing water, pre-hydrated sodium bentonite, calcium chloride, a dispersant, and an alcohol-based defoamer to form a cement slurry;
wherein the cement slurry has a density of from 13.5 pounds per gallon (ppg) to 14.5 ppg and contains the GWP in a range of from 5 wt. % to 20 wt. % of the cement slurry; and
adding 10 wt. % to 15 wt. % of perlite into the cement slurry to form a ternary blend;
injecting the ternary blend into the well at the hydrocarbon-producing subterranean production zone;
curing the ternary blend to seal a wall of the well at the hydrocarbon-producing subterranean production zone; and
wherein the cured ternary blend has a compressive strength of from 30,000 pounds per square inch (psi) to 50,000 psi at an effective pressure of 15,000 psi in the well.

### Claim 2 (depends on 1)

The method of claim 1, wherein the curing takes place for approximately 48 hours; and
the GWP has a pozzolanic reaction with the cement during the curing producing a strength activity of from 100% to 110% compared to the cement.

### Claim 3 (depends on 2)

The method of claim 2, wherein the curing is at a bottomhole circulating temperature (BHCT) of 100 to 130° F., a bottomhole static temperature (BHST) of 160 to 170° F., and a bottomhole pressure (BHP) of 2550 to 2600 psi.

### Claim 4 (depends on 1)

The method of claim 1, wherein mixing the GWP and the cement to form the mixture includes blending at a speed of 20,000 to 25,000 rotations per minute (rpm).

### Claim 5 (depends on 1)

The method of claim 1, wherein the cement slurry consists of the pre-hydrated sodium bentonite, the calcium chloride, the dispersant, and the alcohol-based defoamer.

### Claim 6 (depends on 1)

The method of claim 1, wherein the ternary blend has a thickening time of from 120 minutes to 175 minutes which is measured at a BHCT of 100 to 130° F.

### Claim 7 (depends on 1)

The method of claim 1, wherein the cement has an amount of CaO of from 75 wt. % to 80 wt % of the cement, an amount of SiO2 of from 5 wt. % to 8 wt. % of the cement, and an amount of Fe2O3 of from 8 wt. % to 12 wt. % of the cement.

### Claim 8 (depends on 1)

The method of claim 1, wherein the GWP has an amount of SiO2 of from 60 wt. % to 65 wt. % of the GWP, an amount of Fe2O3 of from 15 wt. % to 21 wt. % of the GWP, and an amount of Al2O3 of from 7 wt. % to 14 wt. % of the GWP.

### Claim 9 (depends on 1)

The method of claim 1, wherein the perlite has an amount of SiO2 of from 70 wt. % to 75 wt. % of the perlite, an amount of Fe2O3 of from 1 wt. % to 2 wt. % of the perlite, and an amount of Al2O3 of from 9 wt. % to 15 wt. % of the perlite.

### Claim 10 (depends on 2)

The method of claim 2, wherein the cured ternary blend has a density of 3 to 4 g/cm3.

### Claim 11 (depends on 2)

The method of claim 2, wherein the GWP has a D50 diameter of from 20 μm to 50 μm.

### Claim 12 (depends on 1)

The method of claim 1, wherein the cement slurry has a sonic strength of from 650 psi to 1050 psi.

### Claim 13 (depends on 1)

The method of claim 1, wherein the ternary blend has a sonic strength of from 200 psi to 1575 psi.

### Claim 14 (depends on 1)

The method of claim 1, wherein the GWP is present in the cement slurry in a range of from 5 wt. % to 15 wt. % of the cement slurry; and
the perlite is present in the cement slurry in a range of from 10 wt. % to 15 wt. % of the cement slurry perlite.

### Claim 15 (depends on 14)

The method of claim 14, wherein the ternary blend comprises:
the cement in an amount of from 80 wt. % to 85 wt. % of the ternary blend, the GWP in an amount of from 5 wt. % to 15 wt. % of the ternary blend, the perlite in an amount of from 5 wt. % to 10 wt. % of the ternary blend, the CaCl2 in an amount of 1 to 2 wt. % of the ternary blend, the bentonite in an amount of at least 2 wt. % of the ternary blend, a defoamer mass of 0.5 to 2 g, and has a water to cement ratio of from 80% to 85%.

### Claim 16 (depends on 14)

The method of claim 14, wherein the ternary blend comprises:
the cement in an amount of from 55 wt. % to 65 wt. % of the ternary blend, the GWP in an amount of from 5 wt. % to 15 wt. % of the ternary blend, the perlite in an amount of from 5 wt. % to 10 wt. % of the ternary blend, the CaCl2 in an amount of 1 to 2 wt. % of the ternary blend, the bentonite in an amount of at least 2 wt. % of the ternary blend, a defoamer mass of 0.5 to 2 g, and a water to cement ratio of from 75% to 80%.

### Claim 17 (depends on 14)

The method of claim 14, wherein the ternary blend comprises:
the cement in an amount of from 45 wt. % to 55 wt. % of the ternary blend, the GWP in an amount of from 5 wt. % to 15 wt. % of the ternary blend, the perlite in an amount of from 10 wt. % to 15 wt. % of the ternary blend, the CaCl2 in an amount of 1 to 2 wt. % of the ternary blend, the bentonite in an amount of at least 2 wt. % of the ternary blend, a defoamer mass of 0.5 to 2 g, and a water to cement ratio of from 75% to 80%.

### Claim 18 (depends on 14)

The method of claim 14, wherein the perlite has a density of 2.60 to 3.5 g/cm3.

### Claim 19 (depends on 14)

The method of claim 14, wherein an amount of silica, alumina, and iron oxide in the ternary blend exceeds 70 wt. % based on the total weight of the ternary blend.

### Claim 20 (depends on 14)

The method of claim 14, wherein the perlite has a D50 diameter of from 70 μm to 100 μm.