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Shale gas directional fracturing yield-increasing method

A directional fracturing and shale gas technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc. It can solve the problems that the distribution of shale gas cannot adapt to the transformation of shale gas reservoirs and the low permeability of reservoirs. , to achieve the effect of avoiding direction randomness, increasing penetration rate and reducing loss

Inactive Publication Date: 2019-03-12
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology

However, due to the characteristics of ultra-low reservoir permeability and various gas occurrence states of shale gas, the conventional fracturing method is fracturing in vertical wells, and the fractures generated by fracturing are uncontrolled and have a large randomness. The uneven distribution of shale gas in shale formations determines that conventional fracturing to form a single fracture stimulation technology can no longer adapt to the stimulation of shale gas reservoirs. It is necessary to explore and study new fracturing technology in order to obtain cost-effective development

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  • Shale gas directional fracturing yield-increasing method
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  • Shale gas directional fracturing yield-increasing method

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Embodiment Construction

[0019] Such as Figure 1-3 As shown, this embodiment relates to a shale gas directional fracturing stimulation method, comprising the following steps:

[0020] a. Drill the vertical well 1 and cement the well with the casing 2; the well shall be drilled with conventional technology, and the drilling depth should not exceed 3,500 meters. After the depth is greater than 3,500 meters, it is no longer suitable for mining due to geothermal problems method. When cementing with casing 2, it is preferable to use 5-inch or 5.5-inch casing for cementing, and the pressure-resistant grade parameter of casing 2 should not be less than 15,000 psi, and a high-pressure casing should be used.

[0021] b. Drill a number of thin radial wells 4 in different radial directions in different flat layers; according to the formation detection results, use the radial well drilling device to drill holes on the casing 2 in the preset direction, and then drill into the shale layer 3 A certain depth is dr...

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Abstract

The invention discloses a shale gas directional fracturing yield-increasing method. The method comprises the following steps of a, drilling a vertical shaftway, and utilizing a casing pipe for well cementation; b, drilling several fine branch radial shaftways in different radial directions at different flat layers; c, implementing a fracturing technology in all the fine branch radial shaftways insequence, and adopting a coiled tube for drainage. According to the method, by drilling the directional fine branch radial shaftways, the direction randomness of fracturing gaps generated by traditional fracturing modes can be avoided, exploitation on directional parcels is promoted, the construction efficiency is improved, and the exploitation amount is also increased. Carbon dioxide in a super-critical state is adopted in fractured prepad liquid so that carbon dioxide can quickly permeate into tiny pores, and shale gas in the pores is replaced; meanwhile, carbon dioxide serves as acid gas tocorrode a shale bed, communication among the adjacent pores is promoted, and the development of the pores can also be promoted; besides, added powder ceramsite can block the tiny pores, the loss of the fracturing liquid is reduced, and the development of large pores is promoted.

Description

technical field [0001] The invention relates to the technical field of shale gas exploitation, in particular to a shale gas directional fracturing stimulation method. Background technique [0002] my country's shale gas resources are relatively large, widely distributed, and have great exploration potential, far exceeding other unconventional natural gas. Its exploration and development has become a hot spot in natural gas exploration and development in the world. However, due to the characteristics of ultra-low reservoir permeability and various gas occurrence states of shale gas, the conventional fracturing method is fracturing in vertical wells, and the fractures generated by fracturing are uncontrolled and have a large randomness. The uneven distribution of shale gas in shale formations determines that conventional fracturing to form a single fracture stimulation technology can no longer adapt to the stimulation of shale gas reservoirs. It is necessary to explore and stu...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267
Inventor 李东元罗平亚付万春赵红蕾游艳平
Owner SOUTHWEST PETROLEUM UNIV
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