High temperature resistant portland cement slurry and production method thereof

Patent metadata

Field	Value
Publication number	US-2019241792-A1
Application number	US-201916260055-A
Country	US
Kind code	A1
Filing date	Jan 28, 2019
Priority date	Feb 2, 2018
Publication date	Aug 8, 2019
Grant date	—

Abstract

The invention provides a high temperature resistant Portland cement slurry and a production method thereof. The high temperature resistant Portland cement slurry comprises the following components by weight: 100 parts of an oil well Portland cement, 60-85 parts of a high temperature reinforcing material, 68-80 parts of fresh water, 1-200 parts of a density adjuster, 0.1-1.5 parts of a suspension stabilizer, 0.8-1.5 parts of a dispersant, 3-4 parts of a fluid loss agent, 0-3 parts of a retarder and 0.2-0.8 part of a defoamer. The high temperature resistant Portland cement slurry has a good sedimentation stability at normal temperature, and develops strength rapidly at a low temperature. The compressive strength is up to 40 MPa or more at a high temperature of 350° C., and the long-term high-temperature compressive strength develops stably without degradation. Therefore, it can meet the requirements for field application in heavy oil thermal recovery wells, reaching the level of Grade G Portland cement for cementing oil and gas wells.

First claim

1 . A high temperature resistant Portland cement slurry, characterized in that the high temperature resistant Portland cement slurry comprises the following components by weight: 100 parts of an oil well Portland cement, 60-85 parts of a high temperature reinforcing material, 68-80 parts of fresh water, 1-200 parts of a density adjuster, 0.1-1.5 parts of a suspension stabilizer, 0.8-1.5 parts of a dispersant, 3-4 parts of a fluid loss agent, 0-3 parts of a retarder and 0.2-0.8 part of a defoamer;
the high temperature reinforcing material is formed by mixing a reinforcing material A, a reinforcing material B, a reinforcing material C, a reinforcing material D, a reinforcing material E and a reinforcing material F in a mass ratio of 40-60:1-3:2-6:1-5:2-4:1-3; wherein the reinforcing material A, the reinforcing material B, the reinforcing material C, the reinforcing material D, the reinforcing material E and the reinforcing material F comprise at least 4 reinforcing materials different from each other; the reinforcing material A comprises any one of silicate minerals and mica flakes; the reinforcing material B comprises any one of aluminates, aluminum-containing minerals, mullite, magnesium silicate minerals, and calcium hydroxide; the reinforcing material C comprises any one of mineral fibers and whiskers; the reinforcing material D comprises any one of apatite and sulfates; the reinforcing material E comprises any one of aluminates, aluminum-containing minerals, mullite, magnesium silicate minerals, and calcium hydroxide; the reinforcing material F comprises any one of aluminates, aluminum-containing minerals, mullite, magnesium silicate minerals, and calcium hydroxide.

2 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the oil well Portland cement comprises one or more of Grade A, Grade G, and Grade H.

3 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the reinforcing materials have a particle diameter of 0.005 mm to 0.15 mm.

4 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the high temperature reinforcing material can withstand a temperature of 350° C. or higher and can allow the Portland cement to withstand a pressures of 40 MPa or more at a temperature of 350° C. or higher.

5 . The high temperature resistant Portland cement slurry according to claim 3 , characterized in that the high temperature reinforcing material is formed by mixing 4-6 different reinforcing materials.

6 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the apatite comprises phosphate minerals.

7 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the aluminum-containing minerals comprise metakaolin and/or plagioclase.

8 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the density adjuster comprises one or more of glass microbeads, floating beads, barite, and iron ore powder.

9 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the suspension stabilizer comprises one or more of attapulgite, diatomaceous earth, xanthan gum and Welan gum.

10 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the dispersant comprises a sulfonated acetone-formaldehyde polymer.

11 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the fluid loss agent comprises 2-acrylamido-2-methylpropane sulfonic acid polymer or polyvinyl alcohol based polymer.

12 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the retarder comprises 2-acrylamido-2-methylpropane sulfonic acid polymer or phosphoric acid based polymer.

13 . The high temperature resistant Portland cement slurry according to claim 1 , characterized in that the defoamer comprises tributyl phosphate.

14 . A method for producing the high temperature resistant Portland cement slurry according to claim 1 , comprising the steps of:
dry mixing the high temperature reinforcing material, the fluid loss agent, the suspension stabilizer, the dispersant and the Portland cement to obtain a dry blend; wet mixing the retarder, the defoamer and fresh water to obtain a wet blend; and adding the dry blend to the wet blend and stirring uniformly to obtain the high temperature resistant Portland cement slurry.

15 . A method of cementing heavy oil thermal recovery wells, comprising:
providing the high temperature resistant Portland cement slurry of claim 1 ; and applying the Portland cement slurry of claim 1 to a heavy oil thermal recovery well.

Assignees

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

Inventors

• Zhang Hua
• Jin Jianzhou
• Liu Shuoqiong
• Qi Fengzhong
• Yu Yongjin
• Xu Ming
• Yuan Jinping
• Ding Zhiwei
• Zhou Chongfeng
• Zhang Chi
• Liu Zishuai
• Feng Yusi
• Guo Yuchao

Classifications

• C04B2111/763

  High temperatures · CPC title

• C04B2103/0035

  Type G · CPC title

• C04B14/043

  Alkaline-earth metal silicates, e.g. wollastonite · CPC title

• C04B14/066

  Precipitated or pyrogenic silica · CPC title

• C09K8/487

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title