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Thermoplastic elastic material for oil well cement and preparation method thereof

A technology of thermoplastic elasticity and oil well cement, applied in the field of materials, can solve the problems of failure to prevent fundamentally, poor dispersion of cement slurry, brittleness of cement stone and easy shrinkage, etc., to ensure long-term stable development, enhance elasticity and toughness, Effect of improving hardness and brittleness

Pending Publication Date: 2022-06-21
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research and application of foreign annulus sealing resins provide a brand-new solution to the problems of gas channeling after cementing and annular pressure, but the field is mainly used for workover and wellhead channeling of gas wells with problems of annular pressure. Gas treatment, well sealing and other operations failed to play a fundamental preventive role. In addition, the resin is expensive and contains biohazardous components; domestic research on elastic and tough additives mainly includes oil well cement self-healing agents and oil well cement plasticizers. , high temperature oil well cement stone elastic material, oil well cement elastic plastic agent, oil well cement toughening agent, water and oil double absorption resin, anti-gas channeling agent, inorganic organic interpenetrating network oil well cement anti-channeling agent, etc., mainly polymer , Composite particles of rigid materials, modified materials, or a mixture of physical mixtures of various materials. These materials have seen certain effects in application, but they have not significantly improved the inherent brittleness and easy shrinkage of cement stones.
[0004] Thermoplastic elastic materials (Thermoplastic Elastomers, referred to as TPE), is a kind of important composite new materials that are being widely researched and applied in polymer alloys, also known as the third generation of rubber, its performance is between rubber and plastic, in It has the high elasticity of rubber at room temperature, and the deformability of soft plastic at high temperature. It also has certain thermal expansion. It is an ideal material to improve the elasticity and toughness of cement stone. However, due to its hydrophobicity, its dispersion in cement slurry Poor, cannot be directly used in cement slurry

Method used

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  • Thermoplastic elastic material for oil well cement and preparation method thereof
  • Thermoplastic elastic material for oil well cement and preparation method thereof
  • Thermoplastic elastic material for oil well cement and preparation method thereof

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preparation example Construction

[0047] The present invention provides a preparation method of the thermoplastic elastic material for oil well cement according to any one of the above technical solutions, comprising:

[0048] A) mixing thermoplastic elastic material, reactive solvent and oil-soluble initiator, heating and stirring to obtain a first solution;

[0049] mixing water-soluble monomer, water, pH adjuster and water-soluble initiator to obtain a second solution;

[0050] B) mixing the first solution and the second solution, heating and stirring, to obtain a reaction product; after the reaction product is granulated, a thermoplastic elastic material for oil well cement is obtained.

[0051] The present invention has already clearly described the above-mentioned components and proportions, and will not be repeated here.

[0052] In the present invention, the thermoplastic elastic material, the reactive solvent and the oil-soluble initiator are mixed, heated and stirred to obtain the first solution.

...

Embodiment 1

[0066] Weigh 200 parts of A171 and 100 parts of TPU powder, place them in a four-necked flask with mechanical stirring, a thermometer, and a condenser, heat up to 120°C, and stir for about 30 minutes to dissolve completely and show a homogeneous solution; weigh 10 parts of acrylic acid and 20 parts of water, placed in an open container and fully dissolved to form a homogeneous aqueous solution, using 8.5 parts of potassium hydroxide; respectively, add 1.0 parts of benzoyl peroxide and 0.1 part of potassium persulfate and mix well; mix the two solutions, The temperature was maintained at 90° C. and the stirring was continued for 30 minutes to obtain a block product. After pulverization and granulation, a thermoplastic elastic material with a particle size of 74 μm to 125 μm was obtained.

Embodiment 2

[0068] Weigh 150 parts of KH570 and 100 parts of TPU powder, place them in a four-necked flask with mechanical stirring, a thermometer, and a condenser, heat up to 120°C, stir for about 30 minutes to dissolve completely, and be a homogeneous solution; take 20 parts of clothing Aconic acid and 40 parts of water were fully dissolved in an open container to form a homogeneous aqueous solution. Use 12 parts of sodium hydroxide; respectively add 0.75 parts of azobisisobutyronitrile and 0.2 parts of ammonium persulfate and mix well; mix the two solutions Mix uniformly, maintain the temperature at 90°C, and continue stirring for 30 minutes to obtain a block product. After pulverization and granulation, a thermoplastic elastic material with a particle size of 74 μm to 125 μm is obtained.

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Abstract

The invention provides a thermoplastic elastic material for oil well cement. The thermoplastic elastic material comprises the following raw materials in parts by weight: 100 parts of a thermoplastic elastic material; 100 to 200 parts of a reactive solvent; 10 to 50 parts of a water-soluble monomer; 20 to 100 parts of water; 1-44 parts of a pH regulator; 0.1 to 1 part of an oil soluble initiator; 0.1 to 1 part of a water-soluble initiator; the reactive solvent is one or more of aminopropyl triethoxy silane, 3-methacryloxy propyl trimethylsilane, vinyl trimethoxy silane or vinyl triethoxy silane, and the reactive solvent is one or more of triethoxy silane, 3-methacryloxy propyl trimethylsilane, 3-methacryloxy propyl trimethylsilane, 3-methacryloxy propyl trimethylsilane, 3-methacryloxy propyl trimethylsilane and 3-methacryloxy propyl trimethylsilane; the water-soluble monomer is one or more of acrylic acid, itaconic acid and 2-acrylamido-2-methyl propane sulfonic acid. According to the invention, the thermoplastic elastic material is mixed and dissolved with the reactive solvent, and is subjected to a polymerization reaction with the water-soluble monomer solution, so that the surface of the thermoplastic elastic material has hydrophilic groups, the thermoplastic elastic material has better temperature resistance, and the hardness, brittleness, elasticity and toughness of set cement are improved.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a thermoplastic elastic material for oil well cement and a preparation method thereof. Background technique [0002] Cementing operation is one of the most important links in oil and gas well drilling engineering. Its main purpose is to seal the oil layer, gas layer and water layer in the wellbore with cement ring, protect the oil and gas well casing, increase the life of the oil and gas well, and improve the oil and gas well. Yield. Cement stone is a hard and brittle material. Later operations such as casing pressure test, perforation, post fracturing stimulation, stress changes caused by temperature field fluctuations, formation compaction slip, etc. may cause cracks and cementation inside the cement sheath. Micro-annular gaps are generated on the surface, destroying the sealing integrity of the cement sheath, which leads to downhole oil and gas water channeling, casing annu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C08F222/02C08F230/08C08F283/02C08F220/58C08F2/44C08K5/544C09K8/508
CPCC08F283/006C08F283/02C08F2/44C08K5/544C09K8/5083C08F220/06C08F230/085C08F222/02C08F220/585
Inventor 李晓岚郑志军郭鹏杨朝光李艳马小龙
Owner 中石化石油工程技术服务有限公司
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