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Novel fracturing pump-injection method

A fracturing pump, a new type of technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as complex process, and achieve the effect of good seepage channel into the well

Active Publication Date: 2015-12-02
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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AI Technical Summary

Problems solved by technology

Coupled with the relatively complicated process and the safety problems caused by the explosion, the application of this fracturing method has great limitations.

Method used

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Embodiment Construction

[0022] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0023] The invention discloses a novel fracturing pump injection method, by which a fracture network system with more efficient conductivity can be formed in a reservoir. In the present invention, the specific implementation process is as follows:

[0024] Install wellheads, connect fluid tanks, fracturing trucks, sand mixing trucks, sand transport trucks, instrument trucks, high-pressure manifolds and other related fracturing equipment 1, after passing the pressure test, start pumping the prefluid through the injection pipeline 2;

[0025] First, use high-viscosity fracturing fluid and large-particle proppants to perform conventional pumping and fracturing of the reservoir. The end screenout technology can be ...

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Abstract

The invention provides a novel fracturing pump-injection method. The novel fracturing pump-injection method specifically comprises the following several stages that 1, a main crack formation stage, namely a high-viscosity fracturing fluid is adopted to conduct conventional pump-injection fracturing on a reservoir and is in coordination with an end screening-out technology to form a main crack definite in crack length and crack width; 2, a branch crack initiation stage, namely a low-viscosity clear water or slick water fracturing liquid system is used for initiating and forming multiple branch cracks at the ends of the main crack and around the main crack in a periodic pulsing pump-injection fracturing mode; 3, a branch crack extending stage, namely a medium-viscosity fracturing liquid system is adopted to enable the crack lengths and the crack heights of the multiple branch cracks to be further increased in a large-displacement conventional pump-injection mode. By means of the novel fracturing pump-injection method, a crack network system formed by the main crack and multiple branch cracks at the tail ends can be formed in the tight reservoir, and an optimal seepage channel is provided for oil gas to flow into a shaft.

Description

Technical field [0001] The invention relates to a novel fracturing pump injection method proposed for the reconstruction of low-permeability tight reservoirs, and belongs to the field of oil and gas field development. Background technique [0002] Hydraulic fracturing is the most commonly used stimulation measure to develop low-permeability tight reservoirs. The choice of pump injection method is an important factor affecting the effect of hydraulic fracturing. [0003] Conventional fracturing generally only forms a single double-wing fracture, and the fracturing effect achieved is also relatively limited. In the actual process, in order to form a complex fracture network, the formation needs to have good congenital conditions, such as more natural fractures in the formation and small horizontal stress difference. Therefore, conventional fracturing methods have great limitations for the exploitation of low-permeability tight oil and gas reservoirs. [0004] In other fracturing met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27
Inventor 张广清周再乐
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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