A numerical simulation method and system that simulates the propagation of a fracture in a conglomerate

By establishing a heterogeneous equivalent fracture network model and combining it with unconventional fracture propagation models and numerical simulation techniques, the problem of rock heterogeneity in the simulation of hydraulic fracture propagation in conglomerate reservoirs in existing technologies has been solved. This has enabled accurate simulation and parameter optimization of complex fracture networks in conglomerate reservoirs, thereby improving reservoir utilization.

CN117371161BActive Publication Date: 2026-07-24PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-06-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies fail to adequately consider rock heterogeneity when simulating hydraulic fracture propagation in conglomerate reservoirs, fail to reflect the periphery characteristics of fracture propagation in conglomerate reservoirs, and are not suitable for macroscopic single-well or multi-well simulations, making it difficult to guide the optimization of actual fracturing parameters and affecting the degree of reservoir activation.

Method used

Using unconventional fracture propagation models and unconventional reservoir numerical simulation techniques, combined with the geological characteristics and geomechanical parameters of conglomerate reservoirs, a heterogeneous equivalent fracture network model was established. Considering fracturing fluid flow and proppant migration, the boundary element method was applied to calculate stress shadows, simulating the propagation of complex fracture networks and the interaction between hydraulic fractures and natural fractures.

Benefits of technology

It achieves accurate simulation of hydraulic fracturing in conglomerate reservoirs, can predict fracture propagation morphology, geometry and proppant distribution, improves simulation accuracy, and can be fitted and corrected with microseismic and tracer data to guide the optimization of fracturing parameters and improve recovery rate.

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Abstract

The present application relates to a kind of conglomerate reservoir hydraulic fracture propagation numerical simulation method and system, the method comprises the following steps: step S1, according to the geological feature parameter of conglomerate reservoir, establish the geological model of conglomerate reservoir;Step S2, according to the geomechanics parameter feature of conglomerate reservoir, establish the geomechanics model of conglomerate reservoir;Step S3, analysis conglomerate reservoir geomechanics parameter and geological feature parameter, obtain the stress direction and natural fracture distribution parameter;Step S4, analysis conglomerate reservoir fracturing process parameter, establish pump injection program;Step S5, the result obtained in combination with step S3 and step S4, carry out hydraulic fracturing complex fracture network propagation simulation calculation, obtain fracture simulation result.The present application can consider complex fracture network propagation and the interaction when hydraulic fracture tip and natural fracture intersect, determine whether hydraulic fracture is through or cut off;Can consider fracturing fluid flow and proppant migration, apply boundary element method to calculate stress shadow, consider fracture interference.
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Citation Information

Patent Citations

  • Sandy conglomerate oil deposit fracturing crack control design method

    CN106294890A

  • Method For Modeling Stimulated Reservoir Properties Resulting From Hydraulic Fracturing In Naturally Fractured Reservoirs

    US20170145793A1