CEMENT SLURRIES, CURED CEMENT AND METHODS OF MAKING AND USE THEREOF

• US 20200131427A1
• Filed: 11/06/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Application

• Current Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia)
• Original Assignee: Saudi Arabian Oil Company (Government of Saudi Arabia)
• Inventors: Alsaihati, Zainab, Al-Yami, Abdullah, Wagle, Vikrant, Al-Awadh, Abdullah, Alhelal, Abdulaziz, Alhareth, Nasser
• Granted Patent: US 10,844,272 B2
• Time in Patent Office: Days
• CPC Class Codes: C04B 14/04 Silica-rich materials; Silicates
• CPC Class Codes: C04B 14/14 Minerals of vulcanic origin granite C04B14/048
• CPC Class Codes: C04B 22/062 of the alkali or alkaline-earth metals
• CPC Class Codes: C04B 22/064 of the alkaline-earth metals
• CPC Class Codes: C04B 2201/20 for the density
• CPC Class Codes: C04B 28/021 Ash cements, e.g. fly ash cements fly ash as filler C04B18/08; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration alkali-activated combustion residues as such C04B7/243; mixtures of the lime-pozzuolane type C04B28/18; Kiln dust cements
• CPC Class Codes: C04B 28/04 Portland cements
• CPC Class Codes: C04B 28/14 containing calcium sulfate cements gypsum-paper plates E04C
• CPC Class Codes: C04B 28/18 containing mixtures of the silica-lime type
• CPC Class Codes: C04B 7/02 Portland cement
• CPC Class Codes: C04B 7/13 Mixtures thereof with inorganic cementitious materials, e.g. Portland cements
• CPC Class Codes: C04B 7/32 Aluminous cements
• CPC Class Codes: C09K 8/46 containing inorganic binders, e.g. Portland cement
• CPC Class Codes: C09K 8/473 Density reducing additives, e.g. for obtaining foamed cement compositions
• CPC Class Codes: E21B 33/14 for cementing casings into boreholes

Abstract

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurries have, among other attributes, increased yield point, reduced density, improved mechanical properties, increased resistance to H₂S, and may be used, for instance, in the oil and gas drilling industry. The cement slurry comprises cement precursor material, Saudi Arabian volcanic ash, and an aqueous solution. The Saudi Arabian volcanic ash comprises SO₃, CaO, SiO₂, Al₂O₃, Fe₂O₃, MgO, and K₂O and the cement slurry is free of any other SiO₂ additive.

Claims

1. A method of cementing a casing in a wellbore comprising:

mixing cement precursor material, Saudi Arabian volcanic ash acquired from Saudi Arabia, and an aqueous solution to form a cement slurry, in which the Saudi Arabian volcanic ash comprises SO₃, CaO, SiO₂, Al₂O₃, Fe₂O₃, MgO, and K₂O and the cement slurry is free of any other SiO₂ additive;

introducing the cement slurry into an annulus between the casing and the wellbore; and

curing the cement slurry to cement the casing in the wellbore.

2. The method of claim 1, in which the Saudi Arabian volcanic ash has a particle size of from 20 to 30 μ

m.

3. The method of claim 1, in which the Saudi Arabian volcanic ash is free of TiO₂.

4. The method of claim 1, in which the Saudi Arabian volcanic ash comprises from 0.05 wt. % to 0.2 wt. % SO₃.

5. The method of claim 1, in which the Saudi Arabian volcanic ash comprises:

from 0.05 wt. % to 0.2 wt. % SO₃;

from 5 wt. % to 10 wt. % CaO;

from 40 wt. % to 50 wt. % SiO₂,

from 10 wt. % to 20 wt. % Al₂O₃;

from 10 wt. % to 15 wt. % Fe₂O₃;

from 5 wt. % to 10 wt. % MgO; and

from 0.5 wt. % to 5 wt. % K₂O.

6. The method of claim 1, in which the cement slurry comprises from 8 to 60 wt. % BWOC Saudi Arabian volcanic ash.

7. The method of claim 2, in which the cement precursor material comprises one or more components selected from the group consisting of calcium hydroxide, silicates, belite (Ca₂SiO₅), alite (Ca₃SiO₄), tricalcium aluminate (Ca₃Al₂O₆), tetracalcium aluminoferrite (Ca₄Al₂Fe₂O₁₀), brownmilleriate (4CaO.Al₂O₃.Fe₂O₃), gypsum (CaSO₄.2H₂O) sodium oxide, potassium oxide, limestone, lime (calcium oxide), hexavalent chromium, trivalent chromium, calcium aluminate, and combinations thereof.

8. The method of claim 1, in which the cement slurry has a density of from 110 to 160 lb/ft³ and a yield point of from 5 to 70 lbf/100 ft².

9. The method of claim 1, in which the method further comprises adding one or more additives selected from the group consisting of dispersants, fluid loss control agents, retarders, expansion additives, antifoaming agents, stabilizers, accelerators, extenders, weighting agents, lost circulation control agents, surfactants, gypsum, hematite, manganese tetroxide, silica flour, and silica sand.