Stratum transformation method

A stratum and reservoir technology, applied in the field of stratum reformation and tight sandstone gas reservoirs, can solve problems such as easy sand plugging, high reservoir fracture pressure, and large fracturing fluid loss, so as to reduce construction difficulty and reduce Burst pressure, improved targeted effect

Pending Publication Date: 2022-05-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

For example, the fracture pressure of the reservoir is high, and some wells are difficult to effectively open the reservoir, and the phenomenon of layer or section loss occurs in engineering; the fracturing fluid has a large a

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Embodiment Construction

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] The present application relates to a formation stimulation method, which is especially suitable for tight sandstone gas reservoirs with a depth of not less than 4000 meters. In this method, step 1 is performed first, and the reservoir is refined and segmented according to the reservoir conditions. Refinement treatment can help to clarify the stimulation horizon and improve the pertinence, thereby increasing the stimulation volume and improving the effect of reservoir stimulation. Then, step 2 is carried out to perform perforating operations according to the segments to form perforations in the divided segments. After the perforation is completed, the fracturing string is run for the third step, the fracturing operation. For each segment, before the main fracture is formed, the pre-acid is pumped into the fracturing string to be used for the contamination of the ...

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Abstract

The invention provides a stratum transformation method, which comprises the following steps of: 1, performing refined segmentation on a reservoir according to reservoir conditions; 2, perforation operation is carried out to form perforations in all the divided sections; 3, fracturing operation is conducted through a fracturing pipe column, in the step 3, pre-acid is pumped into the fracturing pipe column to be used for corrosion of pollution of slurry and cement slurry to a fracture system in the drilling and completion process before main fractures are formed for the divided sections, according to the stratum transformation method, the reservoir is segmented firstly, the transformation layer position can be defined, and the stratum transformation efficiency can be improved; and in the subsequent fracturing operation process, the pre-acid is pumped to corrode the pollution of slurry and cement slurry to a crack system in the drilling and completion process, meanwhile, the fracturing pressure is reduced, the construction difficulty is reduced, the reservoir transformation effect is improved, and the yield is increased.

Description

technical field [0001] The invention relates to the field of oil and gas development engineering, in particular to a stratum modification method, which is especially suitable for tight sandstone gas reservoirs with a depth of not less than 4000 meters. Background technique [0002] For unconventional oil and gas reservoirs, such as tight sandstone oil and gas reservoirs, fracturing can be used to communicate the reservoirs to increase productivity. [0003] However, in the prior art, some problems often occur in the process of fracturing the reservoir reformation. For example, when the fracture pressure of the reservoir is high, it is difficult for some wells to effectively fracturing the reservoir, and the phenomenon of layer or section loss occurs in the project; the filtration of fracturing fluid is large, and sand fracturing is prone to sand blocking, which increases the construction risk; The reformation horizon is not clear, the reservoir reformation is not sufficient...

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Application Information

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IPC IPC(8): E21B43/26E21B47/00
CPCE21B43/26E21B47/00
Inventor 刘林王兴文杨衍东尹琅林立世颜晋川刘琦王峻峰
Owner CHINA PETROLEUM & CHEM CORP
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