A uniform stimulation method and system for tight reservoirs

Abstract

The invention provides a uniform reconstruction method and system of a tight reservoir. The method comprises the steps of performing extreme current limiting fracturing reconstruction on the reservoirto obtain a reservoir perforation reconstruction scheme and fracture data of the reservoir; preparing a temporary plugging agent corresponding to a fracture size demand and a fracture steering pressure demand; selecting fractures with a proportion of liquid inlet quantity accounting for total liquid quantity exceeding a first threshold value in the reservoir as primary temporary plugging fractures; selecting the corresponding temporary plugging agent for primary temporary plugging; and generating a reservoir fracturing reconstruction scheme according to the reservoir perforation reconstruction scheme and reservoir data after the temporary plugging. The uniform reconstruction method and system of the tight reservoir couple an extreme current limiting method and an inter-cluster steering method, the perforation reconstruction scheme is obtained by optimization by the extreme current limiting method, and the temporary plugging is performed on the fractures by the temporary plugging agentbased on perforation reconstruction, so that uniform distribution of the liquid quantity in a fracturing process is facilitated; uniform reconstruction of the fractures is realized; the fracturing effectiveness is improved; and the development efficiency of the reservoir is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a method and system for evenly transforming tight reservoirs. Background technique [0002] Tight oil and gas reservoirs are rich in reserves and have become an important energy substitute in my country. However, due to the low porosity and permeability of tight oil reservoirs, high oil and gas seepage resistance, and rapid energy depletion, conventional vertical well production methods can obtain low daily oil and gas production and slow down production speed. Fast, unable to obtain industrial oil and gas production stably and efficiently. [0003] Horizontal wells and staged fracturing methods have become the necessary means to exploit low-permeability and tight reservoirs. Horizontal wells and staged fracturing can reduce the seepage resistance of oil and gas migration to the bottom of the well, thereby reducing energy loss. Although the convent...

AI Technical Summary

Problems solved by technology

Although the conventional staged fracturing design method for horizontal wells can theoretically obtain multi-stage fractures, due to factors such as stress shadows, it is easy to cause uneven fluid distribution during the fracturing process, and multiple fractures cannot be opened.

In addition, due to the lack of formation fractures, only main hydraulic fractures can be formed after multi-stage fracturing, and complex fracture networks cannot be formed, thereby reducing oil and gas production

Images