Fracturing method of normal-pressure shale gas reservoir

A shale gas reservoir and fracturing technology, which is used in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problem of weak production stability, high drilling and development costs, and constraints on atmospheric pressure shale gas reservoirs. Commercial development process and other issues, to achieve large economic benefits, improve the effect of fracturing and improve the effect of reasonable design

Active Publication Date: 2018-12-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] So far, my country has not made a real breakthrough in the development of normal-pressure shale gas reservoirs. The production has been maintained at about 10,000-30,000 cubic meters per day, and

Method used

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Embodiment Construction

[0040] The present invention will be further described through specific examples below, and it should be understood that the scope of the present invention is not limited to the following exemplary examples.

[0041] Taking Well A (vertical depth 2300m, horizontal section length 1500m) of a certain normal pressure shale gas well A (vertical depth 2300m, horizontal section length 1500m) in Fuling, Chongqing, China as an example, volume fracturing was performed using the fracturing method provided by the present invention, including the following steps.

[0042] Step 1: Finely evaluate the small-scale micro-fracture system (natural fractures and bedding fractures) of the shale reservoir in Well A. Accurately evaluate reservoir lithology, physical properties, rock mechanics, in-situ stress profile, temperature and pressure characteristics and other parameters and micro-crack characteristics through well logging, mud logging, well test data, core data and various midway test data, ...

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Abstract

The invention provides a fracturing method of a normal-pressure shale gas reservoir. The fracturing method comprises the following steps that firstly, reservoir evaluation parameters are obtained; secondly, fracturing construction parameters are determined, specifically, the viscosity, the displacement and the using amount of fracturing liquid and the particle size and the using amount of proppingagents are determined; and thirdly, fracturing construction is conducted, specifically, the reservoir is subjected to segment-by-segment fracturing construction through a spiral-slug-type mixed particle size sand-adding mode. According to the fracturing method of the normal-pressure shale gas reservoir, the complexity index of cracks of the normal-pressure shale gas reservoir can be effectively increased, and the fracturing transformation effect of the normal-pressure shale reservoir is improved accordingly.

Description

technical field [0001] The invention relates to a fracturing method for normal-pressure shale gas reservoirs, belonging to the field of petroleum exploitation. Background technique [0002] Atmospheric pressure shale gas reservoirs refer to shale gas reservoirs with a formation pressure coefficient less than 1.1, and the resources of this type of gas reservoirs are huge in my country. Due to the low formation pressure coefficient and some inherent characteristics, the high-pressure shale formation fracturing technology is not suitable for the fracturing operation of normal-pressure shale gas reservoirs. For example, micro-fractures and bedding / texture fractures of different scales in normal-pressure shale gas reservoirs are generally narrow. The system cannot be effectively filled and supported, resulting in poor fracture complexity and post-fracture stabilization effects. Compared with high-pressure shale reservoirs, the fluid loss during fracturing in normal-pressure sha...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 蒋廷学肖博路保平卞晓冰王海涛刘红磊侯磊
Owner CHINA PETROLEUM & CHEM CORP
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