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Shale reservoir high brittleness optimization method

A shale reservoir, brittle technology, applied in the field of high brittle section selection of shale reservoir, can solve the problems of lack of pertinence and practicability

Inactive Publication Date: 2016-05-04
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0007] Scholars at home and abroad have proposed a variety of methods for the selection of highly brittle sections of shale reservoirs, but these methods are mainly based on rock mineral composition, rock mechanical parameters, rock firmness, and rock debris ratio, etc., and most of them lack pertinence and practicality

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  • Shale reservoir high brittleness optimization method
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  • Shale reservoir high brittleness optimization method

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Embodiment Construction

[0084] The practicability and effectiveness of the present invention are illustrated below with a practical example.

[0085] Western Sichuan shale gas is a pilot area for shale gas exploration and development in the Southwest Exploration Area, in which the “Xuwu” reservoir is the main shale gas reservoir, with shale gas reserves of 8423.02×10 8 m 3 ~11009.04×10 8 m 3 . There are 16 sublayers in this reservoir, and the exploration and development potential is huge. The volume fracturing of two horizontal wells and several vertical wells has been carried out in the early stage, and some achievements have been achieved, but it is still in the exploratory stage in general. The research on the selection of fracturing intervals is relatively difficult, and no good ideas and methods have been formed. method.

[0086] Taking the "Xuwu" reservoir of the shale gas reservoir in western Sichuan as an example, the method provided by the present invention is used to optimize the high ...

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Abstract

The invention discloses a shale reservoir high brittleness optimization method. The method successively includes the following steps: (A) calculating the dynamic Young modulus Ed and the dynamic Poisson's ratio vd of rocks in each section of a reservoir; (B) calculating the I type fracture toughness KIC of the rocks in each section of the reservoir; (C) calculating the brittleness index BI of the rocks in each section of the reservoir by utilizing results of a step (A) and a step (B); and (D) selecting out a layer section with the large brittleness index as a high brittleness layer section. The brittleness of shale reservoir rocks is affected by rock mechanics parameters of a shale and the anti-brittle failure capacity of the shale, the method defines that the brittleness index BI represents the brittleness of the rocks in each section; and a high brittleness shale section can be directly selected out through calculation of the brittleness index BI of the rocks in each section. The method can accurately select out the high brittleness section suitable for fracture in the shale reservoir, and then provides an effective guide for increasing production of the shale reservoir, so that hydraulic fracturing construction in the shale reservoir has pertinence and effectiveness.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for optimizing high brittle sections of shale reservoirs in the field of hydraulic fracturing. Background technique [0002] Hydraulic fracturing technology is an important measure for stimulation of low permeability oil and gas reservoirs. Hydraulic fracturing is to use the ground high-pressure pump group to pump the fracturing fluid into the formation with a displacement exceeding the absorption capacity of the formation to generate fractures, and then continue to inject the fracturing fluid with proppant (sand grains) to make the fracture continue to extend and in It is filled with proppant. When the fracturing fluid flows back, under the action of formation pressure, the proppant plays a role in supporting the fracture in the fracture and preventing the fracture from closing, thus forming a sand filling with a certain length in the...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/087
Inventor 卢聪郭建春罗扬白翔赵志红邓燕苟兴豪罗波许鑫
Owner SOUTHWEST PETROLEUM UNIV
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