Organic/inorganic composite gel plugging agent with rigid interior and flexible exterior, and preparation method thereof

A technology of inorganic compounding and leak-stopping agent, applied in dyeing organosilicon compound treatment, chemical instruments and methods, drilling composition, etc., can solve the problems of poor dispersibility and compatibility, insufficient temperature resistance, etc. The effect of strong resistance, high temperature resistance, and reduction of unnecessary losses

Active Publication Date: 2020-06-02
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned plugging agent still has the problem of insufficient temperature resistance; at the same time, directly adding conventional inorganic rigid particles to the organic gel system has the problem of poor dispersion and compatibility

Method used

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  • Organic/inorganic composite gel plugging agent with rigid interior and flexible exterior, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation of organic / inorganic composite rigid material includes steps:

[0047] (1) Dissolve 4g of γ-methacryloxypropyltrimethoxysilane (KH570) in 100 mL of ethanol-water mixed solvent to obtain solution A; the volume ratio of ethanol to water in the mixed solvent is 4:1, The pH of the mixed solvent was adjusted to 4 with acetic acid; 20 g of nano calcium carbonate was dispersed in 100 mL of ethanol to obtain dispersion B, and the average particle size of the nano calcium carbonate was 50 nm.

[0048] (2) Add dispersion B to solution A dropwise, pour it into a three-necked flask, pour nitrogen into it, heat to 70°C, stir and react for 5h at a stirring speed of 300r / min; then filter the reaction system with suction and remove the resulting product. Washed with water and ethanol for 3 times, then dried at 50° C. for 24 h, and the dried product was ground for 3 min at 30,000 r / min to obtain modified nano calcium carbonate.

[0049] (3) Disperse 6g styrene, 6g butyl methac...

Embodiment 2

[0051] An organic / inorganic composite internal rigid and external flexible gel plugging agent is prepared by including the following mass parts of raw materials: 30 parts of copolymerization monomer, 0.3 part of crosslinking agent, 4 parts of surfactant, and 0.2 part of initiator.

[0052] The copolymerization monomer is the organic / inorganic composite rigid material prepared in Example 1, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, and the mass ratio is 2:6:2:3; The initiator is potassium persulfate; the crosslinking agent is N,N-methylenebisacrylamide (BIS); the surfactant is sodium lauryl sulfate.

[0053] The preparation method of the above organic / inorganic composite internal rigid external flexible gel plugging agent includes the steps:

[0054] Disperse the comonomer, crosslinking agent, and surfactant in deionized water in sequence, and the mass ratio of comonomer and deionized water is 3:7; adjust the system with a sodium hydroxide aqueous solution w...

Embodiment 3

[0056] An organic / inorganic composite internal rigid external flexible gel plugging agent is prepared by including the following mass parts of raw materials: 30 parts of copolymerization monomer; 0.3 parts of crosslinking agent; 4 parts of surfactants; and 0.2 parts of initiators.

[0057] The copolymerization monomer is the organic / inorganic composite rigid material prepared in Example 1, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, and the mass ratio is 3:6:2:3; The initiator is potassium persulfate; the crosslinking agent is N,N-methylenebisacrylamide (BIS); the surfactant is sodium lauryl sulfate.

[0058] The preparation method of the above organic / inorganic composite internal rigid external flexible gel plugging agent includes the steps:

[0059] Disperse the comonomer, crosslinking agent, and surfactant in deionized water in sequence, and the mass ratio of comonomer and deionized water is 3:7; adjust the system with a sodium hydroxide aqueous solution w...

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Abstract

The invention provides an organic / inorganic composite gel plugging agent with rigid interior and flexible exterior, and a preparation method thereof. The gel plugging agent is prepared from, by mass,15-35 parts of a copolymerization monomer, 0.1-0.5 part of a cross-linking agent, 1-10 parts of a surfactant and 0.1-0.5 part of an initiator; the copolymerization monomer comprises an organic / inorganic composite rigid material and a vinyl monomer; the vinyl monomer is a combination of two or more of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and N-vinyl pyrrolidone; and the organic / inorganic composite rigid material is obtained by a polymerization reaction of gamma-methacryloxypropyltrimethoxysilane modified inorganic nanometer calcium carbonate, styrene and butyl methacrylate. The plugging agent has the advantages of high temperature resistance and strong stability, can fully and smoothly enter stratum cracks, and achieves the purpose of effectively plugging crack pores.

Description

Technical field [0001] The invention relates to an organic / inorganic composite internal rigid external flexible gel plugging agent and a preparation method thereof, and belongs to drilling fluid plugging technology in the field of petroleum exploration and development. Background technique [0002] Lost circulation is one of the common complex accidents in the oil drilling process. It will not only cause huge economic losses to the drilling project, but also affect the stability of the well wall. In severe cases, it will cause blowout accidents and threaten the safety of drilling operations. Inorganic rigid materials, such as calcium carbonate, silica, etc., are commonly used plugging materials. However, during the plugging process, the particle size and the crack size are difficult to match, and the plugging success rate is low. Gel plugging technology is one of the commonly used and effective technologies for plugging fractured malignant lost circulation. This technology inject...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09C1/02C09C3/12C08F292/00C08F212/08C08F220/18C08F285/00C08F220/06C08F220/56C08F220/58
CPCC09K8/46C09K8/426C09C1/021C09C3/12C08F292/00C08F285/00C08F212/08C08F220/06C08F220/56
Inventor 韩金良孙金声陈刚吕开河辛江白英睿杨干苗强袁洋
Owner PETROCHINA CO LTD
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