Well cementation working solution prepared from red mud, slag and waste drilling fluids

Patent metadata

Field	Value
Publication number	US-10975284-B2
Application number	US-201816495391-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Feb 6, 2018
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A well cementation working solution prepared from red mud, slag and waste drilling fluids. The working solution is prepared from the following components in parts by weight: 100 parts of waste drilling fluids, 50-100 parts of slag, 5-50 parts of red mud, 4-7 parts of a suspension stabilizer, 1-7 parts of an activating aid, 0.5-5 parts of an anti-pollution agent and 0.4-3.5 parts of a diluent. The waste drilling fluids are waste waterborne drilling fluids. The slag is blast furnace slag or vanadium-titanium slag. The suspension stabilizer is sodium bentonite, carboxymethyl cellulose or a mixture of sodium bentonite and carboxymethyl cellulose. The activating aid is sodium metasilicate nonahydrate, sodium carbonate or a mixture of sodium metasilicate nonahydrate and sodium carbonate. The anti-pollution agent is sodium salicylate, potassium citrate or a mixture of sodium salicylate and potassium citrate. The diluent is sodium lignin sulfonate.

First claim

What is claimed is:

1. A well cementation working solution, comprising the following components in parts by weight:
100 parts of waste drilling fluids;
50-100 parts of a slag;
5-50 parts of an alkaline activator, wherein the alkaline activator consists of a non-dealkalized Bayer red mud;
4-7 parts of a suspension stabilizer;
1-7 parts of an activating aid;
0.5-5 parts of an anti-pollution agent; and
0.4-3.5 parts of a diluent;
wherein the well cementation working solution does not comprise sodium hydroxide and potassium hydroxide.

2. The well cementation working solution of claim 1 , wherein the waste drilling fluids are waste waterborne drilling fluids and the waste waterborne drilling fluids comprise a waterborne drilling fluid suitable for high temperature and high pressure drilling, wherein, the waterborne drilling fluid has a density ranging from 1.10 g/cm 3 to 2.05 g/cm 3 .

3. The well cementation working solution of claim 1 , wherein the slag is a blast furnace slag or a vanadium-titanium ore slag, the blast furnace slag is a S105 pulverized and water quenched blast furnace slag, and the vanadium-titanium slag has a particle diameter of 10-50 μm.

4. The well cementation working solution of claim 1 , wherein the suspension stabilizer is one item selected from the group consisting of sodium bentonite, carboxymethyl cellulose or a mixture of sodium bentonite and carboxymethyl cellulose.

5. The well cementation working solution of claim 1 , wherein the activating aid is one item selected from the group consisting of sodium metasilicate nonahydrate, sodium carbonate or a mixture of sodium metasilicate nonahydrate and sodium carbonate.

6. The well cementation working solution of claim 1 , wherein the anti-pollution agent is one item selected from the group consisting of sodium salicylate, potassium citrate or a mixture of sodium salicylate and potassium citrate.

7. The well cementation working solution of claim 1 , wherein the diluent is sodium lignosulfonate.

8. A method for using the well cementation working solution of claim 1 , comprising the step of applying the well cementation working solution to a well cementation of oil and gas wells.

9. The method according to claim 8 , wherein the waste drilling fluids are waste waterborne drilling fluids, and the waste waterborne drilling fluids comprises a waterborne drilling fluid suitable for high temperature and high pressure drilling, wherein, the waterborne drilling fluid has a density ranging from 1.10 g/cm 3 to 2.05 g/cm 3 .

10. The method according to claim 8 , wherein the slag is a blast furnace slag or a vanadium-titanium ore slag, the blast furnace slag is a S105 pulverized and water quenched blast furnace slag, and the vanadium-titanium slag has a particle diameter of 10-50 μm.

11. The method according to claim 8 , wherein the suspension stabilizer is one item selected from the group consisting of sodium bentonite, carboxymethyl cellulose or a mixture of sodium bentonite and carboxymethyl cellulose.

12. The method according to claim 8 , wherein the activating aid is one item selected from the group consisting of sodium metasilicate nonahydrate, sodium carbonate or a mixture of sodium metasilicate nonahydrate and sodium carbonate.

13. The method according to claim 8 , wherein the anti-pollution agent is one item selected from the group consisting of sodium salicylate, potassium citrate or a mixture of sodium salicylate and potassium citrate.

14. The method according to claim 8 , wherein the diluent is sodium lignosulfonate.

Assignees

• Univ Southwest Petroleum
• China Academy Of Building Res
• Cnpc Eng Tech Res & Dev Co Ltd

Inventors

• Cheng Xiaowei
• Long Dan
• Mei kaiyuan
• Liu Kaiqiang
• Zhang Gaoyin
• Qin Dan
• Gao Xianshu
• Jin Jianzhou
• Wen Zhaijun
• Yu Yongjin
• Zhang Chunmei
• Li Zaoyuan
• Zhang Xingguo
• Guo Xiaoyang

Classifications

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B28/26

  Silicates of the alkali metals · CPC title

• C04B24/18

  Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye · CPC title

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title

• C04B28/08 Primary

  Slag cements · CPC title