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Oil gas-responsive active self-repairing cement slurry system

A self-healing, cement slurry technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of wellbore integrity of the cement sheath, failure of interlayer isolation, etc., and the thickening time can be adjusted arbitrarily , prevention of casing annulus pressure, excellent anti-gas channeling performance

Active Publication Date: 2019-01-11
CHINA PETROCHEMICAL CORP +3
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Problems solved by technology

[0003] Pressure and temperature stimulation operations such as pressure testing, drilling plugs, perforating and fracturing stimulation, and gas testing and commissioning may cause micro-cracks and micro-annulus in the cement sheath of the wellbore, destroying the wellbore integrity of the cement sheath, and resulting in failure of the interlayer seal

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  • Oil gas-responsive active self-repairing cement slurry system
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  • Oil gas-responsive active self-repairing cement slurry system

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Embodiment Construction

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] The present invention is an active self-repairing cement slurry system that responds to oil and gas, according to the cement slurry density of 1.88g / cm 3 Prepared, which included Jiahua G grade oil well cement 800g, fresh water 360mL, modified polyvinyl alcohol polymer self-healing agent 20g, carboxypropyl methylcellulose fluid loss reducer 18g, polycarboxylic acid dispersant 4g, gluconic acid Sodium retarder 6mL and polyvinyl ether defoamer 4mL.

[0027] The preparation method of the above-mentioned active self-healing cement slurry system that responds to oil and gas: Weigh 800g of Jiahua G-grade oil well cement in a sample bag, add 20g of modified polyvinyl alcohol polymer self-healing agent, and mix well; the...

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Abstract

The invention relates to an oil gas-responsive active self-repairing cement slurry system. The system comprises, by weight, 100 parts of oil well cement, 43.0-47.0 parts of freshwater, 2.0-4.0 parts of a self-repairing agent, 1.0-2.0 parts of a fluid loss agent, 0.2-0.5 part of a dispersant, 0.2-1.0 part of a set retarder and 0.2-0.5 part of a defoamer. The oil gas-responsive active self-repairingcement slurry system has the advantages of good rheology, strong self-repairing ability, good elasticity and toughness, adjustable thickening time, stable performances, simple formula composition andsimple on-site construction, and can automatically plug oil gas channels without artificially intervening the ground when a shaft cement ring has micro-cracks and micro-annulus gaps to restore the completeness and the interfacial cementing ability of the cement ring in order to achieve the purpose of preventing the annular pressure of a sleeve.

Description

technical field [0001] The invention relates to the technical field of well cementing in unconventional oil and gas drilling and completion engineering, and more specifically relates to an active self-repairing cement slurry system that responds to oil and gas. Background technique [0002] Casing annulus pressure is a common phenomenon in the production process of oil and gas wells at home and abroad, especially in shale gas wells, affected by large-scale staged fracturing and other stimulation measures, the problem of casing annulus pressure is more prominent and serious. It endangers the safe production and efficient exploration and development of shale gas fields. At present, there are few measures to solve the problem of casing annulus underpressure after cementing, and the cost is high. The research on the prevention technology of casing annulus underpressure has been in the exploratory stage, and has broad research value and application prospect. [0003] Pressure an...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/487
CPCC04B28/00C04B2201/20C04B2201/50C09K8/426C09K8/487C04B2103/408C04B2103/22C04B2103/50C04B24/2623C04B24/26
Inventor 刘俊君张良万彭小平何吉标屈勇张家瑞卞江梁文利尚琼
Owner CHINA PETROCHEMICAL CORP
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