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Self-repairing material for oil-gas well cementation and preparation method

A self-healing material and well cementing technology, applied in the field of oil drilling, can solve problems such as high price, poor mechanical properties of cement stone, damaged cement sheath, etc., to improve acid and alkali resistance, reduce elastic modulus, and increase deformation. effect of ability

Pending Publication Date: 2020-04-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The self-healing cement slurry system disclosed in US patents US7607482 and US7530396 is Selfhealing Cement, a product of a foreign company. The self-healing material is mainly ethylene / butadiene / carboxyl modified rubber, which has achieved good application results at home and abroad, but the price is extremely expensive
[0007] Due to poor cementing quality or poor mechanical properties of cement (hard and brittle), the annulus is under pressure, causing serious safety hazards and reducing the production life of the oil well
At the same time, in order to stabilize and increase production, various oilfields have successively carried out production increase measures such as water injection, fracturing, and acidification. Different operating processes will inevitably cause changes in the stress state of the downhole casing and cement sheath. The use of conventional cement slurry systems may easily lead to damage to the cement sheath. The cement sheath loses its sealing ability, which affects the later production. Therefore, it is necessary to develop a self-repairing material with excellent performance and economical feasibility, which can repair the damage of the cement sheath and improve the long-term sealing performance of the cement sheath.

Method used

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  • Self-repairing material for oil-gas well cementation and preparation method
  • Self-repairing material for oil-gas well cementation and preparation method

Examples

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Effect test

Embodiment 1

[0054]Add 100 parts by weight of ethylene-isoprene-styrene block copolymer particles (average particle diameter 1.5mm) into 1000 parts by weight of ethanol, add 10 parts by weight of water, 5 parts by weight of hydroxyl-terminated polysiloxane, 0.5 parts by weight hydrochloric acid, stirred at 30°C for 60 minutes, then continuously injected 90 parts by weight of water and 40 parts by weight of ethyl orthosilicate within 120 minutes, and stirred at constant temperature for 5 hours to carry out the hydrolysis and condensation reaction. After the reaction was completed, the product was suction-filtered, and dried at a constant temperature at 50° C. to a constant weight.

Embodiment 2

[0056] Add 100 parts by weight of ethylene-isoprene-styrene block copolymer particles (average particle diameter 1.5 mm) into 450 parts by weight of tetrahydrofuran, add 1 part by weight of water, 50 parts by weight of trimethoxysilane, 0.1 part by weight of ethyl Diamine was stirred at 60°C for 30 minutes, and then 1 weight part of sodium silicate was continuously injected within 60 minutes, and stirred at constant temperature for 4 hours to carry out hydrolysis and condensation reaction. After the reaction was completed, the product was suction-filtered, and dried at a constant temperature at 50° C. to a constant weight.

Embodiment 3

[0058] Add 100 parts by weight of ethylene-isoprene-styrene block copolymer particles (average particle diameter 1.5 mm) into 200 parts by weight of ethanol, add 10 parts by weight of water, 25 parts by weight of γ-glycidyl ether oxypropyl trimethyl Oxysilane, 0.3 parts by weight of ethyl acetate, stirred at 60°C for 30 minutes, then continuously injected 40 parts by weight of water and 90 parts by weight of trichlorosiloxane within 60 minutes, stirred at constant temperature for 4 hours, and carried out hydrolysis and condensation reaction. After the reaction was completed, the product was suction-filtered, and dried at a constant temperature at 50° C. to a constant weight.

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Abstract

The invention discloses a self-repairing material for oil and gas well cementation and a preparation method. The self-repairing material is prepared from the following raw materials in parts by weight: 100 parts of an ethylene-isoprene-styrene segmented copolymer, 0.5-100 parts of a precursor, 1-50 parts of a coupling agent, 0.5 to 100 parts of water, 100-1000 parts of a solvent and 0.1-0.5 part of a catalyst. According to the invention, the ethylene-isoprene-styrene segmented copolymer is subjected to physical modification; powder is physically coated with nano silicon dioxide so that non-porous coating is realized, the cementation characteristic between rubber particles and CSH gel is improved, the temperature resistance and stability of self-repairing particles are improved, the mechanical property of set cement is improved, the elastic modulus of the set cement is effectively reduced, and the strain rate of the set cement is increased.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a self-repairing material used in oil and gas well cementing and a preparation method. Adding cement stone can endow cement stone with self-healing ability when it encounters natural gas, and can reduce the elastic modulus of cement stone, which can meet the cementing requirements of high temperature and high pressure gas wells and staged fracturing wells, and is suitable for current high-yield gas wells, shale oil and gas, and tight oil and gas Application in wells and gas storage wells. Background technique [0002] As the gas well annulus under pressure becomes more and more common, the sealing quality and durability of the cement sheath are getting more and more attention in the industry. However, conventional cement stone is a brittle material. During the long-term production or operation of oil wells, the cement sheath is prone to cracks or micro-annulus, result...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B20/10C09K8/467
CPCC04B20/1066C09K8/467C04B24/2688C04B24/42
Inventor 周仕明王其春曾敏汪晓静高元
Owner CHINA PETROLEUM & CHEM CORP
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