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

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...

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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 the formation, under the formation conditions, the Re-cross-link between them to form a high-strength gel to achieve effective plugging. The above-mentioned method is to inject pre-cross-linked gel particles into the formation through the cross-linking agent I. Cross-linking forms an overall gel, but the formulation of the smart gel particles is complicated, and its preparation process is relatively complicated

[0005] The current research on self-healing gel plugging materials is still in its infancy, and it is necessary to develop new self-healing gel plugging materials based on different healing mechanisms

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