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Method increasing shale gas fracturing crack complexity

A complex and air-pressure technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of small network fractures and increase the complexity of fracturing fractures, so as to increase the volume of stimulation and realize the effect of fracturing , the effect of increasing complexity

Active Publication Date: 2017-02-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In recent years, the scale of shale gas development in my country has been continuously expanding, and the level of shale gas fracturing technology has also been greatly improved. However, the probability of network fracture formation is is also very small
In the current technical situation, in order to achieve better fracturing effect, the complexity of fracturing fractures should be increased to the greatest extent

Method used

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  • Method increasing shale gas fracturing crack complexity

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Embodiment Construction

[0020] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0021] The inventor realized that to increase the complexity index of the fracture, the key is to allow the natural fracture to extend longer and wider. If possible, let the main seam turn more times. In the longitudinal direction, press open all bedding / grain seams as much as possible and allow them to maximize their respective extensions. As a result, the stimulated volume of three-dimensional fractures can be maximized vertically and ho...

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Abstract

A method increasing shale gas fracturing crack complexity comprises steps of reducing fracturing liquid viscosity with increase of stratum friability index, controlling sand adding time according to length of natural cracks and crack width extending range, and increasing either fracturing liquid viscosity, liquid volume, discharging volume or construction sand-liquid proportion or several of above to promote main cracks to turn time after time. By the use of the method, fracturing crack volume can be increased and segmental fracturing effect can be enhanced.

Description

technical field [0001] The invention relates to the field of oil exploitation, and more specifically, to a method for increasing the complexity of fracturing fractures in shale gas. Background technique [0002] Shale gas is an unconventional natural gas resource with great potential in recent years, and has become a hot field of oil and gas exploration and development in the world. Shale gas reservoirs are rich in organic matter and are typical self-generation and self-storage gas reservoirs. Compared with conventional natural gas reservoirs, the natural gas in it is mainly free gas and adsorbed gas, and is in-situ saturated and enriched in the micro-nano-scale pores-fractures and mineral particle surfaces of the shale reservoir system, with no obvious gas-water interface. , Large-area continuous accumulation, low porosity, low permeability and other characteristics, generally have no natural production capacity, and industrial production capacity must be formed through fr...

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Application Information

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IPC IPC(8): E21B43/267
Inventor 蒋廷学苏瑗卞晓冰卫然贾长贵
Owner CHINA PETROLEUM & CHEM CORP
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