Fracturing production increasing method for deep shale gas

A technology for shale gas and shale gas exploitation, which is applied in earthwork drilling, extraction fluid, wellbore/well components, etc., can solve problems such as the difficulty of artificial fractures, reduce horizontal stress difference, reduce friction, and ground The effect of construction pressure reduction

Active Publication Date: 2019-03-19
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to provide a deep shale gas fracturi

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  • Fracturing production increasing method for deep shale gas
  • Fracturing production increasing method for deep shale gas
  • Fracturing production increasing method for deep shale gas

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[0029] In the following description, for illustrative purposes, many specific details are set forth in order to provide a comprehensive understanding of one or more embodiments. However, it is obvious that these embodiments can also be implemented without these specific details. In other examples, for the convenience of describing one or more embodiments, well-known structures and devices are shown in the form of block diagrams.

[0030] The shale in a deep shale gas development operation area is located 3900m underground, the thickness of the rock layer is 210m, and the temperature in the middle of the rock layer is 120℃. In the following, three fracturing units are taken as examples to illustrate the fracturing stimulation method for deep shale gas provided by the present invention:

[0031] Step S1: The measured horizontal maximum principal stress direction is 90° North-East, and the vertical wells A1 and A2 are drilled sequentially along this direction. The distance between th...

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Abstract

The invention provides a fracturing production increasing method for deep shale gas, which divides a deep shale gas exploitation area into at least three fracturing units, wherein each fracturing unitcomprises five straight wells and two horizontal wells; the fracturing production increasing method for the deep shale gas comprises the following steps: fracturing the two fracturing units positioned on the two sides; S11, performing hydraulic fracturing operation on the straight wells to generate cracks with single shape in the same direction as the horizontal maximum principal stress; S12, performing pumping bridge plug fracturing operation in staggered sequence on horizontal wells to generate network fractures in a reservoir, and the fracturing fluid adopted by the pumping bridge plug fracturing operation is liquid nitrogen carrying proppant; S2, fracturing the horizontal wells of the middle fracturing unit and a straight well positioned between the horizontal wells to generate network cracks. According to the fracturing production increasing method, complex network fractures interwoven with artificial fractures and branch fractures can be generated, the volume and the seepage area of the reformed reservoir can be increased, and the purpose of improving the recovery ratio of the shale gas reservoir can be achieved.

Description

technical field [0001] The invention relates to the technical field of shale gas exploitation, in particular to a multi-stage fracturing method for deep shale gas horizontal wells, which generates complex network fractures in which artificial fractures and branch fractures interweave and increases the volume and seepage of the reformed reservoir Area, to achieve the purpose of improving the recovery rate of shale gas reservoirs. Background technique [0002] The exploration and development of unconventional shale gas resources has become a research hotspot today, and the continuous breakthroughs in supporting horizontal wells and multi-stage fracturing technology have enabled the United States, Canada and other countries to successfully realize large-scale commercial development, which has greatly promoted the global oil and gas industry. Changes in resource structure, mining methods, technological innovation, etc. my country has established shale gas industrial production ...

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Application Information

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IPC IPC(8): E21B43/26E21B43/30
CPCE21B43/26E21B43/305
Inventor 曲海刘营张硕魏秦文林魂吴康军
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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