Scour-resistant interface enhancer used for well cementing of coalbed methane wells, preparation method, and application

Patent metadata

Field	Value
Publication number	US-11820936-B2
Application number	US-202318097190-A
Country	US
Kind code	B2
Filing date	Jan 13, 2023
Priority date	Jan 14, 2022
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A scour-resistant interface enhancer, a preparation method, and an application thereof are provided. The scour-resistant interface enhancer is a compound solution prepared by using a 0.1% surfactant CAEO-15 and a 0.3% silane coupling agent as solutes and using clear water and absolute ethanol as solvents, where the mass ratio of clear water to absolute ethanol is 9:1. The scour-resistant interface enhancer of the present invention used as pre-flush for well cementing of coalbed methane wells has good wettability modification effect, shows scour-resistant effect against cement slurry, exhibits good compatibility with cement slurry system, and can significantly improve the cementing strength and air tightness of two interfaces of coal bed and effectively enhance the cementing quality of coalbed methane wells.

First claim

What is claimed is:

1. A scour-resistant interface enhancer, wherein the scour-resistant interface enhancer is a compound solution prepared by using a surfactant, said surfactant consisting of coconut amide ethoxylate-15 (CAEO-15), and using a silane coupling agent as solutes, and using a mixture of clear water and absolute ethanol as a solvent;
a mass percentage of the surfactant CAEO-15 is 0.1%; and a mass percentage of the silane coupling agent is 0.3%.

2. The scour-resistant interface enhancer according to claim 1 , wherein a mass ratio of the clear water to the absolute ethanol is 9:1.

3. A preparation method of the scour-resistant interface enhancer according to claim 1 , comprising the specific steps of:
(1) mixing the clear water and the absolute ethanol in proportion to obtain a solution I;
(2) adding the surfactant to the solution I, dropwise adding the silane coupling agent under a low-speed stirring, and continuing the low-speed stirring for 15 min to obtain the scour-resistant interface enhancer.

Assignees

• Univ China Petroleum East China
• Guizhou Engineering Res Institute Of Oil & Gas Exploration And Development

Inventors

• Guo Shenglai
• Bu Yuhuan
• Lu Chang
• Zhao Lingyun
• Wei Yuanlong
• Zhao Qi
• Liu Huajie
• Wang Qiang
• Guo Xinyang

Classifications

• C09K8/487 Primary

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

• C09K8/584

  characterised by the use of specific surfactants · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B28/04 Primary

  Portland cements · CPC title

• C04B20/1051

  Organo-metallic compounds; Organo-silicon compounds, e.g. bentone · CPC title