Network crack diversion capability optimization method

A conductivity and fracture technology, applied in the field of conductivity optimization of network fractures formed by fracturing, can solve problems such as lack of optimization methods for conductivity, and achieve the effects of volume optimization, permeability optimization, and efficient support

Active Publication Date: 2017-04-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, at present, there is still a lack of optimization methods for what kind of network fracture conductivity is required for reservoirs, and the conductivity of each level of fracture in the network fractures, which has great blindness in actual fracturing design and construction.

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Embodiment Construction

[0018] The specific embodiment of the present invention will be described in detail below by taking a well as an example. details as follows:

[0019] 1. Parameter optimization of high permeability zone: The porosity of the shale gas well is 3.09%, the reservoir permeability is 0.8058mD, and the reservoir thickness is 27.5m. According to the equivalent seepage theory, the volume of the reservoir communicated by the fracture network is simplified as a high permeability zone, and the volume and permeability of the high permeability zone are optimized by using the optimal production rate. The optimized high permeability zone volume is 172.5×10 4 m 3 , the permeability of the high permeability zone is 3mD.

[0020] 2. Calculation of equivalent permeability of the fracture network: use the volume and permeability of the high permeability zone obtained in step 1, combined with the permeability of the reservoir, calculate with formula (1), and determine the equivalent fracture per...

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Abstract

The invention provides a network crack diversion capability optimization method, for the purposes of determining diversion capabilities needed by a main crack supported by a proppant and a self-support crack not supported by the proppant in network cracks, providing guidance for fracture optimization design, forming an efficiently supported crack network and improving the shale gas reservoir and the compact hydrocarbon reservoir fracture effect. According to the invention, complex network cracks are equivalent to simple crack bodies for optimization mainly based on a hydropower similar principle. First of all, reservoir stratums for crack network communication are equivalent to high-permeation bands, and the permeability of the high-permeation bands are optimized by use of output optimization; then according to the hydropower similar principle, equivalent crack permeability is optimized; and finally, diversion capabilities of the ceramsite support main crack and the self-support branch crack in the network cracks are respectively optimized, and thus the guidance is provided for the fracture optimization design.

Description

Technical field: [0001] The invention relates to hydraulic fracturing optimization technology for shale gas reservoirs and tight oil and gas reservoirs, in particular to a method for optimizing the conductivity of network fractures formed by fracturing. Background technique: [0002] With the deepening of exploration and development of oil and gas resources, unconventional oil and gas reservoirs such as shale gas and tight oil and gas reservoirs have become hot spots in exploration and development. Due to the extremely low permeability and porosity of these unconventional oil and gas reservoirs, they must rely on large-scale hydraulic fracturing to form a complex network of fractures for effective development. However, at present, there is still no optimization method for what kind of network fracture conductivity is required in the reservoir, and the conductivity of each level of fracture in the network fracture should be possessed, which has great blindness in actual fract...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B41/0092E21B43/26E21B43/267
Inventor 赵志红郭建春张晗卢聪
Owner SOUTHWEST PETROLEUM UNIV
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