Gel particle plugging agent with self-healing characteristic as well as preparation method and application thereof

A gel particle and self-healing technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as complex preparation process, low pressure plugging temperature, and complex formula of smart gel particles

CN112250787AActive Publication Date: 2021-01-22CHINA UNIV OF PETROLEUM (EAST CHINA)

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Patent Information

Authority / Receiving Office: CN · China
Current Assignee / Owner: CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date: 2021-01-22

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Abstract

The invention provides a gel particle plugging agent with a self-healing characteristic. The gel particle plugging agent is prepared from the following raw materials in parts by mass: 15-35 parts of acopolymerization reaction monomer, 0.1-20 part of a surfactant A, 0.01-0.9 part of an initiator I, 0.01-0.1 part of a cross-linking agent and 0.5-5 part of cationic latex particles; wherein the copolymerization monomer comprises a hydrophilic monomer and a hydrophobic monomer, the hydrophilic monomer is a combination of acrylic acid and an acrylamide monomer, and the hydrophobic monomer is an acrylate monomer. The invention also provides a preparation method and a healing performance evaluation method of the gel particle plugging agent. The self-healing plugging material disclosed by the invention has the characteristic of recoverability after being damaged, is injected into stratum cracks in a particle form, and can form integral gel after being healed, so that the purpose of effectivelyplugging crack pores is achieved.

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Description

technical field

[0001] The invention relates to a gel particle plugging agent with self-healing properties, a preparation method and application thereof, and belongs to the technical field of oil and gas drilling. Background technique

[0002] Lost circulation is a common phenomenon in the process of oil drilling. According to statistics, the occurrence rate of lost circulation accounts for 20% to 25% of the total number of wells in the world. Lost circulation will not only cause huge economic losses to the drilling project, but also lead to a serious drop in well pressure, which will have a great impact on the stability of the inner wall of the oil well. In severe cases, it will lead to blowout accidents, which seriously threaten the safety of drilling operations. sex. Gel leak plugging technology is one of the commonly used and effective technologies for plugging leaky layers. The current gel plugging technology has achieved good results in field applications, but there a...

Claims

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