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A kind of high temperature resistant compound strengthened gel plugging agent and preparation method thereof

A technology of plugging agent and high temperature resistance, which is applied in the field of drilling fluid plugging, which can solve the problems that the plugging agent is difficult to enter the leaky layer, the failure of sealing crack pores, and the collapse of the network structure, etc., so as to improve the high temperature resistance and improve the support and the effect of effective plugging time and high water expansion rate

Active Publication Date: 2021-09-28
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently adopted gel plugging technology has achieved relatively good results in field application, but there are still problems that the gel particles absorb water and expand too fast, making it difficult for the plugging agent to enter the leakage layer; the temperature resistance is insufficient, and the material will appear in high-temperature formations. Heated syneresis, network structure collapse, and thermal degradation occur, which will lead to insufficient residence time of the plugging material in the fracture pores, resulting in failure to seal the fracture pores

Method used

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  • A kind of high temperature resistant compound strengthened gel plugging agent and preparation method thereof
  • A kind of high temperature resistant compound strengthened gel plugging agent and preparation method thereof
  • A kind of high temperature resistant compound strengthened gel plugging agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The preparation of cross-linking agent WEG comprises steps:

[0058] (1) hydroxyethyl methacrylate and α-methylstyrene (mass ratio 4:1) monomer and 1g tert-butyl peroxybenzoate were dispersed in deionized water of 15ml and 5ml respectively with a total mass of 10g, Obtain solutions A and B;

[0059] (2) The required surfactant Maize 49 (polyoxyethylene stearate) and glyceryl monostearate are mixed in a mass ratio of 5:15 for a total of 40g to obtain a composite surfactant; The active agent was dissolved in 160ml of methylcyclohexane at 60°C to obtain a microemulsion;

[0060] (3) Using the dropping method, solution A and solution B are respectively added dropwise to the microemulsion successively. After the dropwise addition, continue to stir with a magnetic stirrer at a rate of 400r / min and react at a constant temperature of 60°C for 4h to obtain the microemulsion; to the microemulsion 2 g of dibenzoyl peroxide was added to the mixture, high-pressure nitrogen gas was...

Embodiment 2

[0062] A high-temperature-resistant composite strengthened gel plugging agent, which is prepared from the following raw materials in parts by mass: 20 parts of copolymerized reaction monomers; 1.0 parts of cross-linking agent WEG prepared by the method in Example 1; 0.2 parts of initiator; resin-based support Granules 1.0 parts.

[0063] The copolymerization reaction monomer is hydroxyethyl methacrylate, dimethylaminoethyl methacrylate and β-hydroxyethyl methacrylate, and the mass ratio is 4:2:1; the initiator is peroxygen Compound initiator cumene hydroperoxide; The resin-based support particles are boron phenolic resin particles (spherical particles, the average particle diameter is 32 μm, and the density is 1.41 g / cm 3 ) and bismaleimide resin particles (spherical particles with an average particle size of 30 μm and a density of 1.43 g / cm 3 ) combination, the mass ratio of boron phenolic resin particles and bismaleimide resin particles is 2:1.

[0064] The preparation met...

Embodiment 3

[0067] A high-temperature-resistant composite reinforced gel plugging agent, which is prepared from the following raw materials in parts by mass: 20 parts of copolymerized reaction monomers; 2.0 parts of crosslinking agent WEG prepared by the method in Example 1; 0.2 parts of initiator; resin-based support Granules 1.5 parts.

[0068] The copolymerization reaction monomer is hydroxyethyl methacrylate, dimethylaminoethyl methacrylate and β-hydroxyethyl methacrylate, and the mass ratio is 4:2:1; the initiator is peroxygen Compound initiator cumene hydroperoxide; The resin-based support particles are boron phenolic resin particles (spherical particles, the average particle diameter is 32 μm, and the density is 1.41 g / cm 3 ) and bismaleimide resin particles (spherical particles with an average particle size of 30 μm and a density of 1.43 g / cm 3 ) combination, the mass ratio of boron phenolic resin particles and bismaleimide resin particles is 2:1.

[0069] The preparation method...

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Abstract

The invention provides a high-temperature-resistant composite reinforced gel plugging agent and a preparation method thereof. The gel plugging agent of the present invention is prepared from the following raw materials in parts by mass: 15-35 parts of comonomer; 1.0-2.0 parts of crosslinking agent WEG; 0.1-0.5 parts of initiator; 0.5-2.0 parts of resin-based support particles ; The copolymerization monomer is polyoxyethylene ether, hydroxyethyl methacrylate, dimethylaminoethyl methacrylate, 2-ethyl methacrylate, β-hydroxyethyl methacrylate or N- A combination of three or more of vinylpyrrolidones. The leakage plugging agent of the invention has the characteristics of high temperature resistance and delayed expansion, can fully and smoothly enter formation cracks, and achieve the purpose of effectively sealing crack pores.

Description

technical field [0001] The invention relates to a high-temperature-resistant composite reinforced gel plugging agent and a preparation method thereof, belonging to drilling fluid plugging technology in the field of petroleum exploration and development. 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. In recent years, as the exploration and development of oil and gas resources continue to deepen into the formation, the problem of lost circulation has been paid more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44
CPCC09K8/44
Inventor 李伟王波张文哲李红梅王涛白英睿吕开河薛少飞
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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