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Oil-based gel leak stopping slurry

An oil-based gel and plugging slurry technology, which is applied in the field of oil drilling, can solve the problems of large leakage loss, oil-based drilling fluid failure, and inability to plug the wellbore, so as to improve the success rate and increase the bearing capacity. The effect of moderate pressure and strength

Active Publication Date: 2015-12-30
YANGTZE UNIVERSITY +1
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Problems solved by technology

[0008] The above-mentioned gel plugging systems are all water-based gel systems, and the use of oil-based drilling fluids will cause oil-based drilling fluids to fail, resulting in failure to plug leaks or even scrapping the wellbore; and conventional plugging materials are bridge plugging Leakage materials have certain limitations, and special plugging techniques are required for large leaks and lost-return leaks

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Embodiment Construction

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] The preparation method of this plugging slurry is:

[0026] (1), under high-speed stirring, add solidifying agent in described base oil, stir 5 minutes;

[0027] (2), under high speed stirring, add described clear water, stir for 5 minutes;

[0028] (3), under high-speed stirring, add described activator, stir for 5 minutes;

[0029] (4), under high-speed stirring, add the corresponding amount of weighting agent, and stir for 20 minutes.

[0030] The consumption of each embodiment is as follows:

[0031] ...

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Abstract

The invention provides an oil-based gel leak stopping slurry. The slurry comprises, by weight, 35-70 parts of base oil, 5-25 parts of a curing agent, 0.1-1 part of an activator, 0.5-4 parts of water and 0-60 parts of a weighting agent. The oil-based gel leak stopping slurry has the advantages of simple formula, onsite preparation and construction benefiting, effective inhibition of invasion of a stratum fluid, maintenance of the trend of gradual enhancement with time after leakage layer injection, improvement of the bearing ability of the leakage layer, solving of the loss problem of a loss return type loss well, and improvement of the one-time leak stopping success rate.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to an oil-based gel plugging slurry. Background technique [0002] Oil-based drilling fluid refers to the drilling fluid with oil as the continuous phase, which has many advantages such as high temperature resistance, salt and calcium intrusion resistance, good borehole wall stability, good lubricity, and little damage to oil and gas layers. It has been widely used in the operations of shale gas and deep and complex wells. [0003] Lost circulation is a vicious and complicated situation in the drilling process. Once a lost circulation occurs, it will prolong the drilling time and lose the drilling fluid, especially the oil-based drilling fluid. Complicated situations and accidents such as blowout, collapse, stuck pipe, etc., even lead to the scrapping of the wellbore. [0004] Chinese invention patent "a gel plugging agent and its preparation method" (application number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/48C09K8/32
CPCC09K8/32C09K8/48
Inventor 许明标周贤海艾军赵明琨
Owner YANGTZE UNIVERSITY
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