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

Active Publication Date: 2021-01-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the above two materials are self-healing gel plugging materials prepared based on metal coordination bonds and hydrogen bonds, and their pressure-bearing plugging temperature is relatively low.
Chinese patent document CN105504158A provides a re-crosslinkable smart gel particle under formation conditions and its preparation method and application. The smart gel particle is composed of acrylamide, anionic monomer, cationic monomer, N,N -Vinylpyrrolidone, pH adjusting agent, initiator, crosslinking agent Ⅰ, crosslinking agent Ⅱ, stabilizer, nano particle material and water. After the gel particles enter

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

Examples

Experimental program
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[0068] Example 1

[0069] A gel particle plugging agent with self-healing properties, comprising the following raw materials in parts by mass: 25 parts of copolymerization reaction monomers, 10 parts of surfactant A, 0.01 part of initiator I, and 0.04 part of cross-linking agent , 2 parts of cationic latex particles.

[0070] The copolymerization reaction monomer is a combination of octadecyl methacrylate, acrylic acid, and acrylamide, and the mass ratio of octadecyl methacrylate, acrylic acid, and acrylamide is 3:50:50.

[0071] The surfactant A is sodium lauryl sulfate.

[0072] The initiator I is an oxidation-reduction initiator, the oxidizing agent is ammonium persulfate, the reducing agent is sodium hydrogen sulfite, and the mass ratio of the oxidizing agent and the reducing agent is 1:1.

[0073] The crosslinking agent is N,N-methylenebisacrylamide.

[0074] The above-mentioned preparation method of the gel particle plugging agent with self-healing properties comprise...

Example Embodiment

[0093] Example 2

[0094] A gel particle plugging agent with self-healing properties, comprising the following raw materials in parts by mass: 35 parts of copolymerization reaction monomers, 10 parts of surfactant A, 0.05 parts of initiator I, and 0.02 parts of cross-linking agent , 2 parts of cationic latex particles.

[0095] The types of the copolymerization reaction monomer, surfactant A, initiator I, and crosslinking agent are as described in Example 1.

[0096] The preparation method of the above-mentioned gel particle plugging agent with self-healing properties is as described in Example 1, except that the amount of deionized water is 112 parts.

[0097] The method for evaluating the performance of the self-healing gel plugging material is as described in Example 1, and the performance of the self-healing gel plugging material is shown in Table 1.

Example Embodiment

[0098] Example 3

[0099] A gel particle plugging agent with self-healing properties, comprising the following raw materials in parts by mass: 15 parts of copolymerization reaction monomers, 10 parts of surfactant A, 0.01 part of initiator I, and 0.02 part of cross-linking agent , cationic latex particles are 1 part.

[0100] The types of the copolymerization reaction monomer, surfactant A, initiator I, and crosslinking agent are as described in Example 1.

[0101] The preparation method of the above-mentioned gel particle plugging agent with self-healing properties is as described in Example 1, except that the amount of deionized water is 50 parts.

[0102] The method for evaluating the performance of the self-healing gel plugging material is as described in Example 1, and the performance of the self-healing gel plugging material is shown in Table 1.

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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.

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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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F220/18C08F222/38C08F220/54C09K8/035C09K8/42
CPCC08F220/06C08F220/54C08F220/56C09K8/035C09K8/426C08F220/1818C08F222/385
Inventor 白英睿孙金声吕开河刘敬平黄贤斌王金堂金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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