An artificial fracture evaluation method based on geological engineering integration

By combining Petrel and Flac3D software to establish a three-dimensional geomechanical model, and combining continuous medium damage mechanics and discrete element method, the shortcomings of artificial fracture assessment in existing technologies are solved, and comprehensive identification and efficient assessment of complex fracture networks are achieved.

CN117371077BActive Publication Date: 2026-06-05PETROCHINA CO LTD
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Patent Information

Application Number
CN202210763614.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-06-30
Publication Date
2026-06-05
Estimated Expiration
2042-06-30

AI Technical Summary

Technical Problem

Existing technologies fail to effectively consider changes in actual geological and rock mechanics parameters in artificial fracture assessment. They are also unable to comprehensively consider the effects of production/injection, dynamic initiation of multi-stage fractures, fluid flow, and temperature changes on stress disturbance. Furthermore, they lack comprehensive evaluation methods and have limited means of identifying post-compression fractures.

Method used

A three-dimensional geomechanical model was established by combining Petrel and Flac3D software, based on the integrated approach of geology and engineering. The hydraulic fracturing process was simulated by combining the continuous medium damage mechanics model and the discrete element method. The artificial fracture morphology was explained by the fracturing construction curve, taking into account both geological and mechanical factors.

Benefits of technology

It enables comprehensive identification of artificial fracture networks, improves the accuracy and efficiency of assessment, saves on microseismic monitoring costs, provides more realistic geostress field simulation, and can effectively interpret complex fracture networks.

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Abstract

The application discloses a kind of artificial fracture evaluation methods based on geotechnical engineering integration, belong to petroleum reservoir field.The application comprehensively uses geological model and one-dimensional rock profile to establish regional geostress field model, and the establishment of geostress model is different from the modeling method of transmission geological attribute body, and the effect of its geostress field is more real through the whole rock mass loading regional stress and the deformation generated by rock mass stress.The fracture network is divided into the fracture part formed by artificial fracture main fracture and the damage area composed of natural fracture and artificial microfracture, and the factors considered are more comprehensive by comprehensively using geological model, geomechanical model and damage coupling theory.The corresponding characteristics of fracturing operation curve are used for interpretation, and the complexity of fracture network of reformed fracture is identified according to the peak value change of interpretation characteristic curve.Compared with microseismic monitoring, millions of test interpretation costs are saved, and the artificial fracture supported can be well explained by combining damage coupling prediction model.
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