A cutting-core-wellbore-reservoir multi-scale 3-D fracturing evaluation method for shale reservoirs

A shale reservoir, multi-scale technology, applied in wellbore/well components, earthwork drilling, etc., can solve the problems of severe geological structure, lack of gas, large differences in physical properties and heterogeneity of shale reservoirs, etc. , to shorten the drilling cycle, reduce the recovery time, and save the drilling cost.
CN105156103BActive Publication Date: 2018-06-05SOUTHWEST PETROLEUM UNIV +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2018-06-05

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Abstract

The invention relates to a debris-core-borehole-reservoir multiscale shale reservoir three-dimensional fracturing evaluation method. The method comprises the steps of: (S1) calculating mineral content brittleness indexes in a shale coring position; (S2) building relations among an internal friction angle, I type and II type fracture toughness and rock mechanical parameters; (S3) building shale fracturing evaluation models comprehensively considering a mineral content, elastic parameters, the internal friction angle, a critical strain energy release rate and the rapture toughness; (S4) applying a support vector machine algorithm to obtain a cluster analysis mode between a reservoir fracturing performance and the elastic parameters; and (S5) applying the cluster analysis mode and a reservoir three-dimensional elastic parameter data body to obtain a debris-core-borehole-reservoir multiscale shale reservoir three-dimensional fracturing model. The method can be applied to obtain the fracturing performance of any space position in a shale reservoir, so that the well position selection blindness is prevented, and the fracturing modification effect and the after-pressing yield are improved.
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Description

technical field

[0001] The invention belongs to the technical field of shale oil and gas development, and in particular relates to a three-dimensional fracturing evaluation method for shale reservoirs with multiple scales of cuttings-core-wellbore-reservoir. Background technique

[0002] With the continuous and rapid growth of my country's national economy, the demand for energy has increased sharply, and the contradiction between supply and demand of oil and natural gas resources has become prominent. my country's shale gas resources are very rich. According to the latest research results of the Oil and Gas Center of the Ministry of Land and Resources in 2012, the recoverable resources of shale gas in my country are 25 trillion cubic meters, and the development potential is huge. With the successful development of typical shale gas fields such as Barnett and Eagle Ford in the United States and Fuling in my country, shale gas is expected to become an important alternative en...

Claims

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