Preparation method of the microcapsules for low-temperature well cementation to be used to control cement hydration heat

Patent metadata

Field	Value
Publication number	US-11786880-B2
Application number	US-202217750054-A
Country	US
Kind code	B2
Filing date	May 20, 2022
Priority date	Jun 15, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A preparation method of the microcapsules for low-temperature well cementation to be used to control cement hydration heat includes: (S1) a shell material, and added into deionized water, then the resultant mixture being stirred in a thermostat water bath so as to completely dissolve it into a homogeneous and stable shell material solution; (S2) a core material and an emulsifier being put into a three-necked flask and stirred in a thermostat water bath so as to uniformly emulsify and disperse them, forming a stable oil-in-water core material emulsion, while adjusting the pH value of the emulsion with a pH adjuster; (S3) the three-necked flask containing the core material emulsion being transferred to a water bath, and then the shell material solution being dropwise added into it with stirring, after reacting, a solid-liquid mixture being poured out so as to naturally cool it to room temperature.

First claim

What is claimed is:

1. A preparation method of the microcapsules for low-temperature well cementation to be used to control cement hydration heat, comprising the following steps in proper order:
S1: a shell material being weighted with 10-20 g, and added into 50-100 mL of deionized water, then the resultant mixture being stirred in a thermostat water bath at 45° C. so as to completely dissolve it into a homogeneous and stable shell material solution, said shell material being sodium silicate NaSiO 3 ·9H 2 O;
S2: 10-20 g of a core material and 0.02-0.1 g of an emulsifier being put into a three-necked flask and stirred in a thermostat water bath at 45° C. for 30-60 min so as to uniformly emulsify and disperse them, forming a stable oil-in-water core material emulsion, while adjusting the pH value of said emulsion to descend below 5.5 with a pH adjuster, where said core material is a binary composite phase-change material prepared by n-decanoic acid and lauryl alcohol, the preparation process of said binary composite phase-change material includes mixing n-decanoic acid with lauryl alcohol by mass ratio of 1:1, and stirring them evenly; said emulsifier is a mixture of alkylphenol polyoxyethylene ether-10 and cetyl trimethyl ammonium bromide, the mass ratio of the cetyl trimethyl ammonium bromide is 20-80%;
S3: said three-necked flask containing said core material emulsion being transferred to a water bath at 50-90° C., and then said shell material solution being dropwise added into it with stirring, after reacting for 2-3 hours, a solid-liquid mixture being poured out so as to naturally cool it to room temperature, thus said cooled solid-liquid mixture being processed by suction filtration, washed with ethanol and deionized water, respectively, to remove impurities, and finally being processed by freeze-drying.

2. The preparation method according to claim 1 , wherein in S2 said pH adjuster is hydrochloric acid HCl.

Assignees

• Univ Southwest Petroleum
• Yao Bai Special Cement Tech Research And Development Co Ltd

Inventors

• Zhang Chunmei
• Cai Jingxuan
• Wang Jia
• Cheng Xiaowei
• Liu Kaiqiang
• Wang Ping
• Xu Hao
• Dai Bibo
• Ke Baoyang
• Guo Xiaoyang
• Li Mingze
• Yang Song
• Xi Zheng

Classifications

• B01J13/043 Primary

  Drying and spraying · CPC title

• C04B20/0004

  Microcomposites or nanocomposites, e.g. composite particles obtained by polymerising monomers onto inorganic materials · CPC title

• C09K5/06 Primary

  the change of state being from liquid to solid or vice versa · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B40/0046 Primary

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title