A method for optimizing the design of flowback production after three-dimensional fracturing well pattern in shale oil

By establishing a flow simulation method that can simultaneously simulate the reflow and discharge of shale oil three-dimensional fracturing well network and optimized design with genetic algorithms, the problem that the existing technology is difficult to simulate flow characteristics throughout the cycle is solved, and the efficient development and optimization of shale reservoirs are achieved.

CN118657005BActive Publication Date: 2025-03-18CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Application Number
CN202411148823.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-21
Publication Date
2025-03-18
Estimated Expiration
2044-08-21

AI Technical Summary

Technical Problem

The existing technology is difficult to simulate the flow characteristics of the shale oil stereoscopic fracturing well network reflux and production process throughout the whole cycle. The numerical simulation method has the problem of poor convergence and long operation time.

Method used

By considering the effects of fracturing liquid filtration loss and suction replacement, a flow simulation method can be established that can simultaneously characterize the entire process of reflux and production, and combined with genetic algorithms, an optimization design method for post-pressure reflux production of shale oil three-dimensional fracturing well network is constructed.

Benefits of technology

The careful description of the return-discharge production process of shale reservoirs and the optimal design of the development plan of the three-dimensional fracturing well network are achieved, and the final recoverable reserves and development efficiency of single-well evaluation are improved.

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Abstract

The present invention discloses a shale oil three-dimensional fracturing well network post-pressure backflow production optimization design method, which belongs to the field of oil and gas field development technology, and includes the following steps: step 1, sorting out the basic parameters of shale oil reservoirs; step 2, establishing a mathematical model of the backflow production process of the fracturing horizontal wells in the shale oil reservoir; step 3, solving the mathematical model of the backflow production process of the fracturing horizontal wells in the shale oil reservoir based on the Newton-Raphson method; step 4, analyzing the dynamic nodes of the reservoir-wellbore-nozzle flow system; step 5, optimizing the nozzle working system based on the genetic algorithm; step 6, designing a three-dimensional fracturing well network backflow production plan for the shale oil reservoir. The present invention can realize the simulation of the backflow production process and the optimization of the production plan of the three-dimensional fracturing well network in the shale oil reservoir, and provide theoretical guidance and technical support for the three-dimensional development of shale oil reservoirs.
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