High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof

Patent metadata

Field	Value
Publication number	US-12497331-B2
Application number	US-202318315088-A
Country	US
Kind code	B2
Filing date	May 10, 2023
Priority date	Nov 20, 2020
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A high-strength Portland cement slurry for ultra-high-temperature cementing, a preparation method therefor and an application thereof. In parts by weight, the composition of the cement slurry comprises: 100 parts of Portland cement, 4-6 parts of a high temperature anti-cracking material, 80-105 parts of a high-temperature reinforcing material, 70-78 parts of water, 0.5-1.5 parts of a dispersant, 1-3 parts of a fluid loss reducer, 0.5-2.5 parts of a retarder and 0.2-0.5 parts of a defoamer; the high-temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin and aluminum sulfate, a combination of acid-washed quartz sand, metakaolin, feldspar and sodium sulfate, or a combination of acid-washed quartz sand, metakaolin, feldspar and calcium nitrite. The cement slurry has good settling stability, rapid strength development in low temperatures, high compressive strength of cement stone at a high temperature of 600° C., and stable development of long-term high-temperature compressive strength.

First claim

The invention claimed is:

1 . A high-strength Portland cement slurry for ultra-high temperature cementing, comprising by weight:
100 parts of Portland cement, 4-6 parts of a high temperature anti-cracking material, 80-105 parts of a high temperature reinforcing material, 70-78 parts of water, 0.5-1.5 parts of a dispersant, 1-3 parts of a fluid loss additive, 0.5-2.5 parts of a retarder, and 0.2-0.5 parts of a defoamer; wherein the high temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin, and aluminum sulfate in a mass ratio of 25-35:5-15:1, or a combination of acid-washed quartz sand, metakaolin, feldspar, and sodium sulfate in a mass ratio of 25-35:5-15:5-15:1, or a combination of acid-washed quartz sand, metakaolin, feldspar, and calcium nitrite in a mass ratio of 25-35:5-15:5-15:1.

2 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the Portland cement is one or two or more of Grade A, Grade B, Grade C, Grade D, Grade E, Grade F, Grade G, Grade H and Grade J Portland cements for cementing oil and gas wells.

3 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the high temperature anti-cracking material comprises a combination of two materials from basalt fiber, mullite, and sepiolite, and the mass ratio between the two materials is 1-3:1.

4 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 3 , wherein the mass ratio between the two materials constituting the high temperature anti-cracking material is 1:1.

5 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 2 , wherein the high temperature anti-cracking material comprises a combination of two materials from basalt fiber, mullite, and sepiolite, and the mass ratio between the two materials is 1-3:1.

6 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 5 , wherein the mass ratio between the two materials constituting the high temperature anti-cracking material is 1:1.

7 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the high temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin, and aluminum sulfate in a mass ratio of 30:10:1.

8 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the high temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin, feldspar, and sodium sulfate in a mass ratio of 30:10:10:1, or a combination of acid-washed quartz sand, metakaolin, feldspar, and calcium nitrite in a mass ratio of 30:10:10:1.

9 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the dispersant comprises an aldehyde-ketone condensate or a polycarboxylic acid-based dispersant.

10 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the fluid loss additive is an AMPS polymer-based fluid loss additive.

11 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the retarder is one or two or more of hydroxyethylidenediphosphonic acid, etidronic acid and ethylenediamine tetramethylene phosphonic acid.

12 . The high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , wherein the defoamer is dimethyl silicone and/or tributyl phosphate.

13 . A method for producing the high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 , comprising the steps of:
dry-mixing the high temperature anti-cracking material, the high temperature reinforcing material, the fluid loss additive, the dispersant and the Portland cement uniformly; wet-mixing the retarder, the defoamer and water uniformly; and adding the dry mixture to the wet mixture under stirring, and stirring them until uniform to obtain the high-strength Portland cement slurry for ultra-high temperature cementing.

14 . A method of a cementing operation, wherein the method uses the high-strength Portland cement slurry for ultra-high temperature cementing according to claim 1 ,
the cementing operation is a cementing operation at 600° C. or higher; in the cementing operation, the high-strength Portland cement slurry forms cement stone after a curing process.

Assignees

• China Nat Petroleum Corp
• Cnpc Eng Tech Res & Dev Co Ltd

Inventors

• Zhang Hua
• Jin Jianzhou
• Yu Yongjin
• Qu Congfeng
• Qi Fengzhong
• Xu Ming
• Liu Shuoqiong
• Wang Zhaohui
• Guo Yuchao
• Liu Jiliang
• Lyu Bin
• Ding Zhiwei
• Zhang Chi
• Liu Zishuai
• Ji Hongfei
• Xia Xiujian
• Li Yong
• Zhou Chongfeng
• Zhang Xiaobing

Classifications

• C04B2201/50

  for the mechanical strength · CPC title

• C04B2111/00724

  in mining operations, e.g. for backfilling; in making tunnels or galleries · CPC title

• C04B40/0039

  Premixtures of ingredients · CPC title

• C04B22/14

  containing sulfur in the anion, e.g. sulfides · CPC title

• C04B14/46

  Rock wool {; Ceramic or silicate fibres (C04B14/40, C04B14/42 take precedence)} · CPC title