Active self-healing cement slurry system in response to oil and gas
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A self-healing, cement slurry technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as failure of interlayer isolation, damage to the wellbore integrity of the cement sheath, etc.
Active Publication Date: 2021-07-06
CHINA PETROCHEMICAL CORP +3
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[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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[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 active self-repairing cement slurry system that responds to oil and gas, including oil well cement, fresh water, self-repairing agent, fluid loss reducer, dispersant, retarder and defoamer, and its proportion is based on the weight of oil well cement The benchmark calculation is: 100 parts of oil well cement, 43.0-47.0 parts of fresh water, 2.0-4.0 parts of self-healing agent, 1.0-2.0 parts of fluid loss reducer, 0.2-0.5 parts of dispersant, 0.2-1.0 parts of retarder, defoaming Dose 0.2‑0.5 parts. The active self-healing cement slurry system that responds to oil and gas of the present invention has the characteristics of good rheology, strong self-healing ability, good elasticity and toughness, arbitrarily adjustable thickening time and stable performance, simple formula composition and on-site construction, etc., and can be used in wellbore cement sheath When micro-cracks and micro-annulus appear, there is no need for manual intervention on the ground, the channel of oil and gas channeling is automatically blocked, the integrity of the cement sheath and the interface bonding ability are restored, and the purpose of preventing casing annulus from pressure is achieved.
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...
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