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

A self-repairing material and well cementing technology, applied in the field of oil drilling, can solve the problems of cement sheath losing its sealing ability, reducing the production life of oil wells, and poor mechanical properties of cement stone, so as to reduce the elastic modulus, increase deformation ability, and high temperature effect

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 successiv

Method used

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

Examples

Experimental program
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Example Embodiment

[0054] Example 1

[0055] Add 100 parts by weight of polyisoprene particles (average particle size 1.5mm) to 1000 parts by weight of ethanol, add 10 parts by weight of water, 5 parts by weight of hydroxy-terminated polysiloxane, and 0.5 parts by weight of hydrochloric acid at 30°C Stir for 60 minutes, then continuously inject 90 parts by weight of water and 40 parts by weight of ethyl orthosilicate within 120 minutes, and stir at constant temperature for 5 hours to carry out hydrolysis and condensation reaction. After the reaction is completed, the product is suction filtered and dried to constant weight at a constant temperature of 50°C.

Example Embodiment

[0056] Example 2

[0057] Add 100 parts by weight of polyisoprene particles (average particle size 1.5mm) to 450 parts by weight of tetrahydrofuran, add 1 part by weight of water, 50 parts by weight of trimethoxysilane, and 0.1 parts by weight of ethylenediamine at 60°C Stir for 30 minutes, and then continuously inject 1 part by weight of sodium silicate within 60 minutes, and stir at constant temperature for 4 hours to carry out hydrolysis and condensation reaction. After the reaction is completed, the product is suction filtered and dried to constant weight at a constant temperature of 50°C.

Example Embodiment

[0058] Example 3

[0059] Add 100 parts by weight of polyisoprene particles (average particle size 1.5mm) to 200 parts by weight of ethanol, add 10 parts by weight of water, 25 parts by weight of hydroxyl-terminated polysiloxane, and 0.3 parts by weight of ethyl acetate at 60°C Stir for 30 minutes under the conditions, and then continuously inject 40 parts by weight of water and 90 parts by weight of trichlorosiloxane within 60 minutes, and stir at constant temperature for 4 hours to carry out hydrolysis and condensation reaction. After the reaction is completed, the product is suction filtered and dried to constant weight at a constant temperature of 50°C.

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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: 100 parts by weight of polyisoprene; 0.5 to 100 parts by weight of a precursor; 1-50 parts by weight of a coupling agent; 0.5 to 100 parts by weight of water; 100 to 1000 parts by weight of a solvent; and 0.1-0.5 partby weight of a catalyst. A nano SiO2 shell layer is generated on the surface of the polyisoprene by a sol-gel method; the coupling agent is introduced so that the polyisoprene and the nano SiO2 shelllayer are effectively linked, and the mechanical property and the heat resistance of the whole core-shell structure material are improved, so that the compatibility of the modified self-repairing nano composite material and a cement matrix is improved, and the modified self-repairing nano composite material has better comprehensive mechanical property and heat resistance in the cement matrix.

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): C04B24/26C09K8/467
CPCC04B40/0046C09K8/467C04B22/06C04B24/2611
Inventor 丁士东陶谦曾敏汪晓静刘建
Owner CHINA PETROLEUM & CHEM CORP
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