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A kind of organic/inorganic composite internally rigid and externally soft gel plugging agent and preparation method thereof

A technology of inorganic compounding and plugging agent, which is applied in the direction of dyeing organosilicon compound treatment, chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient temperature resistance, poor dispersion and compatibility, and achieve durability Improved high temperature capability, strong stability, and improved high temperature resistance

Active Publication Date: 2022-05-03
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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  • A kind of organic/inorganic composite internally rigid and externally soft gel plugging agent 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 100mL of ethanol-water mixed solvent to obtain solution A; the volume ratio of ethanol and water in the mixed solvent is 4:1, And adjust the pH of the mixed solvent with acetic acid to be 4; disperse 20g of nano-calcium carbonate in 100mL of ethanol to obtain dispersion B, and the average particle diameter of the nano-calcium carbonate is 50nm.

[0048] (2) Add dispersion B to solution A dropwise, pour into a three-necked flask, feed nitrogen, heat to 70°C, stir and react at a stirring speed of 300r / min for 5h; Wash with water and ethanol for 3 times, then dry at 50°C for 24h, and grind the dried product for 3min at 30000r / min to obtain modified nano-calcium carbonate.

[0049] (3) 6g styrene, 6g butyl methacrylate, 2g step (2) gained modified nano-calcium carbonate are dispersed in 56g mass concentration and are in t...

Embodiment 2

[0051] An organic / inorganic composite internally rigid and externally flexible gel plugging agent is prepared from the following raw materials in parts by mass: 30 parts of a copolymerization monomer, 0.3 parts of a crosslinking agent, 4 parts of a surfactant, and 0.2 parts of an initiator.

[0052] The copolymerization reaction 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-mentioned organic / inorganic composite inner rigid outer soft gel plugging agent comprises the steps of:

[0054] Disperse the comonomer, crosslinking agent, and surfactant in deionized water successively, and the mass ratio of the comonomer and deionized water is 3:7; it is 15% sodium hydroxi...

Embodiment 3

[0056] An organic / inorganic composite internally rigid and externally flexible gel plugging agent is prepared from the following raw materials in parts by mass: 30 parts of a copolymerization monomer; 0.3 parts of a crosslinking agent; 4 parts of a surfactant; and 0.2 parts of an initiator.

[0057] The copolymerization reaction 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-mentioned organic / inorganic composite inner rigid outer soft gel plugging agent comprises the steps of:

[0059] Disperse the comonomer, crosslinking agent, and surfactant in deionized water successively, and the mass ratio of the comonomer and deionized water is 3:7; it is 15% sodium hydroxi...

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Abstract

The invention provides an organic / inorganic composite inner rigid outer soft gel plugging agent and a preparation method thereof. The gel plugging agent of the present invention comprises the following raw materials prepared in parts by mass: 15-35 parts of comonomers, 0.1-0.5 parts of crosslinking agents, 1-10 parts of surfactants, and 0.1-0.5 parts of initiators; Said comonomer comprises organic / inorganic composite rigid material and vinyl monomer, said vinyl monomer is acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid or N-vinyl A combination of two or more of pyrrolidone, the organic / inorganic composite rigid material is inorganic nano-calcium carbonate modified with γ-methacryloxypropyl trimethoxysilane and styrene, butyl methacrylate Ester polymerization reaction. The lost circulation agent of the present invention has the advantages of high temperature resistance and strong stability, can fully and smoothly enter formation fractures, and achieves the purpose of effectively sealing fracture pores.

Description

technical field [0001] The invention relates to an organic / inorganic composite inner rigid outer soft gel plugging agent and a preparation method thereof, which belongs to the 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 process of oil drilling. 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 lead to blowout accidents and threaten the safety of drilling operations. Inorganic rigid materials, such as calcium carbonate, silicon dioxide, etc., are commonly used plugging materials, but their particle size and fracture particle size are difficult to match during the plugging process, and the plugging success rate is low. Gel plugging technology is one of the commonly used and effective technologies for plugging malignant lost circulation in fractures. ...

Claims

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Application Information

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Patent Type & Authority Patents(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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