Low-permeability oilfield water attack composite fracturing process method

A technology of composite fracturing and process method, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling composition, etc., to achieve the effect of enhancing production increase, simple and feasible process, and expanding the radius of acidizing treatment

Inactive Publication Date: 2020-08-25
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, there is currently a lack of a water hammer composite fracturing process for low-permeability oilfields in China.

Method used

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  • Low-permeability oilfield water attack composite fracturing process method

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Embodiment

[0031] Such as figure 1 As shown, the device used in a low-permeability oil field water hammer composite fracturing process method of the present invention includes a hydraulic impactor 1, oil pipe 2, pipeline 3, casing valve 4, acidizing tank 5, diversion pipe 6, pump injection Pressure gauge 7, impact plate 8, mud pump 9, mud pool 10, impact chamber 11, plunger 12, perforated tailpipe 13, acidizing pump 14, pumping pressure data acquisition and displacement automatic control system 15.

[0032] The acidizing tank is connected to the acidizing pump through a pipeline, the mud pool is connected to the mud pump through a pipeline, and the two are connected to the inlet of the oil pipe through a tee. The upper end of the oil pipe is provided with a casing valve, and the lower end of the oil pipe is connected to a hydraulic impactor , the hydraulic impactor and the construction string connected with the oil pipe are arranged in the oil well. The acidification pump is connected w...

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Abstract

The invention discloses a low-permeability oilfield water attack composite fracturing process method. According to the method, high-density and strong-corrosion single-slug acid liquid is used for replacing well liquid to serve as impact liquid, the pressure starting rock breaking effect can be improved, corrosion and seam expansion are further achieved directly, and the pressure drop change of acid tank switching is overcome; in cooperation with a computer programming type acidizing pump, a variable-displacement pumping mode is adopted, further and effective combination of underground hydraulic impact with high pressure and short duration and ground hydraulic impact with low pressure and long duration is achieved, and therefore a crack net can be further formed; and meanwhile, the acidizing treatment radius is enlarged. The process method is simple, feasible and low in cost, construction equipment does not occupy too much space, the yield increasing effect is remarkable compared witha single measure, and the method has good application space in ocean platforms or well sites with limited construction space or water sources.

Description

technical field [0001] The invention belongs to the technical field of oil-water well acidification fracturing stimulation production and injection technology, and in particular relates to a low-permeability oilfield water hammer composite fracturing process method. Background technique [0002] The effective development of low-permeability oilfields is also an important part of the national energy strategy, and the production stimulation technology is an important part of oilfield development, and it is also a direct means to contribute to oil production and reduce foreign dependence. At present, hydraulic fracturing technology is the main technical method for increasing production of low-permeability oilfields at home and abroad. The United States has achieved energy independence through the revolution of shale gas through hydraulic fracturing. Changqing Oilfield, represented by domestic low-permeability oilfields, uses hydraulic fracturing Based on technical breakthroughs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27C09K8/72
CPCE21B43/26C09K8/72
Inventor 孙林黄波易飞杨万有邹信波陈维余刘帅李旭光匡腊梅熊培祺周际永杨军伟黄利平夏光
Owner CHINA NAT OFFSHORE OIL CORP
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