Leak-proof lost-circulation control water-based drilling fluid composition and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-11542425-B1
Application number	US-202217727063-A
Country	US
Kind code	B1
Filing date	Apr 22, 2022
Priority date	Feb 24, 2022
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

The present disclosure a leak-proof lost-circulation control water-based drilling fluid composition and preparation method and use thereof.

First claim

The invention claimed is:

1. A method of preparing a modified calcium carbonate leak-proof lost circulation additive, including:
(1) contacting a purified calcium carbonate with a modifying agent to form a dispersion liquid;
(2) contacting the dispersion liquid with an activating agent to carry out a surface modification treatment, and subjecting the obtained mixture to a solid-liquid separation, drying and ultrasonic exfoliation treatment to produce a modified calcium carbonate leak-proof lost circulation additive;
wherein the modifying agent is polydimethylsiloxane, the activating agent is a fatty acid.

2. The method of claim 1 , wherein the purified calcium carbonate in step (1) is used in an amount of 5-10 g relative to 100 mL of the modifying agent.

3. The method of claim 1 , wherein the activating agent is used in an amount of 5-20 g relative to 100 mL of the modifying agent.

4. The method of claim 1 , wherein the activating agent in step (2) is one or more selected from the group consisting of stearic acid, oleic acid and cinnamic acid.

5. The method of claim 1 , wherein the conditions of the surface modification treatment comprise a temperature of 50-80° C. and a time of 2-6 hours.

6. The method of claim 1 , wherein the drying conditions comprise a temperature of 60-100° C. and a time of 2-6 hours;
wherein the conditions of the ultrasonic exfoliation treatment comprise an ultrasonic frequency of 3-4 MHz and a time of 50-70 min.

7. The method of claim 1 , wherein the preparation method further comprises: performing a purification treatment prior to the step (1), wherein the conditions of the purification treatment comprise: contacting a quick lime with hot water to perform a digestive treatment and obtain an emulsion; then subjecting the emulsion to a carbonization treatment and drying treatment to obtain a purified calcium carbonate.

8. The method of claim 7 , wherein the temperature of hot water is 80-90° C.

9. The method of claim 7 , wherein the emulsion has a concentration of 10-20%.

10. The method of claim 7 , wherein the conditions of the carbonization treatment comprise: a temperature of 600-1200° C.

11. The method of claim 7 , wherein the carbonization treatment is terminated when a pH of the suspension is neutral.

12. The method of claim 7 , wherein the modified calcium carbonate leak-proof lost circulation additive has a particle size distribution of 500 to 15,000 mesh.

Assignees

• Univ Southwest Petroleum

Inventors

• Bai Yang
• Wu Lingfeng
• Zhang Jing
• Li Wenzhe
• Luo Pingya
• Dai Feng
• Liu Jingping
• Wang Ren
• Li Daoxiong
• Xu Wen

Classifications

• C09C1/021 Primary

  Calcium carbonates · CPC title

• C09K8/24

  Polymers · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• C09K8/426 Primary

  for plugging · CPC title

• E21B33/13

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title