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Plugging agent for petroleum drilling

A technology of oil drilling and plugging agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of unfavorable acidification and decontamination, easy pollution of oil and gas layers, and low acid solubility rate, and achieves a simple and easy preparation process. line, improve plugging effect, easy to acidify and remove plugging effect

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the plugging agents in the prior art are generally low in acid solubility, easy to pollute oil and gas layers when used in reservoir sections, and unfavorable for acidification and decontamination after oil and gas wells are put into production, the present invention proposes a plugging agent for oil drilling and its preparation method

Method used

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  • Plugging agent for petroleum drilling

Examples

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Effect test

Embodiment 1-4

[0024] First, each component A and component B shown in Table 1 is processed (such as grinding), and then the granular component A of 150~250 μm and the fine powder component B below 150 μm are screened with a standard sieve. Cut component C into 1~2mm short wires for later use.

[0025] Put each component into a high-speed universal mixer according to the formula of Example 1-4 shown in Table 1 and stir for a certain period of time, then take it out to obtain the leak-stopping agent of Example 1-4.

[0026] The acid solubility of the lost circulation plugging agents obtained in each embodiment in 15% hydrochloric acid was measured, and the results are shown in Table 1.

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Abstract

The invention provides a plugging agent for petroleum drilling. The plugging agent for petroleum drilling is composed of the following components: 60-80 parts of component A, namely, calcium carbonate and / or barium carbonate, 15-25 parts of component B, namely, lime powder and / or G-grade cement, and 5-15 parts of component C, namely, fibre materials, wherein preferably, the component A is particles with a particle size of 150-250 microns; the component B is powder with a particle size of greater than 0-150 microns; the length of the component C is 1-2 mm. The invention further provides preparation and application methods for the plugging agent. The plugging agent provided by the invention is simple in ingredients and preparation method, for example, the acid solubility can achieve more than 97.5%, thus facilitating acidification unplugging; the plugging agent can be independently used for plugging while drilling or matched with other bridging materials, and used in large and medium loss plugging work.

Description

technical field [0001] The invention relates to the field of oil drilling plugging, in particular to a plugging agent for oil drilling and a preparation method thereof. Background technique [0002] Lost circulation is one of the common downhole problems in oil drilling. Lost circulation not only consumes drilling time and loses drilling fluid, but also may cause a series of problems such as pipe sticking, blowout, and well wall instability. For reservoir lost circulation, fine particles in the drilling fluid will accumulate in the narrow throats of the oil and gas channels in the reservoir, thereby blocking part of the flow channels or making the flow channels smaller, thus reducing the flow of oil and gas. These solid-phase plugs are often unable to be discharged under the counter pressure difference generated by oil testing or oil production, thus causing permanent blockage and seriously affecting oil and gas production. [0003] In order to protect the reservoir, the de...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/42
CPCC09K8/03C09K8/032C09K8/50C09K2208/04C09K2208/08C09K2208/18
Inventor 刘四海刘金华张凤英高书阳陈曾伟王治法张国徐江
Owner CHINA PETROLEUM & CHEM CORP
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