Hydraulic fracturing methods and equipment for fractured reservoirs

By constructing a fracture model and conducting pressure tests, the optimal sand concentration value was determined, which solved the problem that existing technologies could not accurately measure the relationship between sand concentration and conductivity in natural fractures, thus improving the design effect of hydraulic fracturing in fractured reservoirs.

CN116607925BActive Publication Date: 2026-05-26PETROCHINA 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
2022-02-08
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies cannot accurately measure the relationship between sand concentration and conductivity in natural fractures, making it impossible to determine the optimal sand concentration in hydraulic fracturing design of fractured reservoirs, which may lead to impaired conductivity or poor production enhancement.

Method used

By constructing a fracture model of a fractured reservoir, pressure tests were conducted using water at different injection pressures to obtain the correspondence between the sand-filled concentration value and the conductivity value of the sand-filled fracture. The optimal sand-filled concentration value corresponding to the target injection pressure was determined, and hydraulic fracturing was performed under this closure pressure.

Benefits of technology

It enables accurate measurement of the relationship between sand concentration and conductivity in natural fractures, providing a decision-making reference for sand fracturing operations and improving single-well production.

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Abstract

This invention provides a method and equipment for hydraulic fracturing fractured reservoirs. The method and equipment utilize simulated fractures to represent natural fractures. By varying the injection pressure, different closure pressures are simulated, and the relationship between the proppant concentration and the conductivity of the proppant-filled fractures under different closure pressures is obtained. This relationship is then used to determine the optimal proppant concentration for natural fracture filling, providing a basis for hydraulic fracturing design in fractured reservoirs. Fracturing design based on the experimentally obtained proppant concentration can maximize the conductivity of the proppant-filled fractures, thereby maximizing single-well production.
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