Advanced energy storage fracturing method

Abstract

The invention discloses an advanced energy storage fracturing method. The advanced energy storage fracturing method comprises the following steps that firstly, a pressure detection device is lowered,secondly, shaft bottom data are collected, thirdly, water is injected into the shaft bottom, fourthly, ifthe converted pressure coefficient is smaller than the stratum stop injection pressure coefficient, the third step is returned, if the converted pressure coefficient is larger than the stratum stop injection pressure coefficient, the injection of clear water is stopped, at this time, the near wellbore pore pressure is increased, pore microfractures are expanded, the effective stress of rock is lowered, thus fracture fracturing of a main fracturing reservoir in later stage is lower, the fracture network density is larger, fracturing fluid is easier to flow back, and thus the single well yield is greatly increased; and fifthly, a main fracturing pipeline is connected to conduct main fracturing in later stage. The near wellbore pore pressure is improved, the pore microfractures are expanded, the effective stress of the rock is lowered, the purposes of advanced energy storage and expansion are achieved, thus fracture fracturing of the main fracturing reservoir in later stage is lower, the fracture network density is larger, fracturing fluid is easier to flow back, and thus the single well yield is greatly increased.

Description

technical field [0001] The invention belongs to the field of petroleum fracturing, and in particular relates to an advanced energy storage fracturing method. Background technique [0002] Hydraulic fracturing is the main technology for increasing production of tight oil and gas reservoirs. It aims to create an artificial fracture system in the reservoir. With the development of design concepts and material tools, it has formed hybrid fracturing, foam fracturing, volume fracturing, and vertical well fractures. Various fracturing technologies such as layered fracturing and multi-stage fracturing of horizontal wells. However, the existing technologies all emphasize real-time operations, and there are no other processes between perforation and fracturing. At this stage, the reservoir stress state, seepage pattern, and fracture pores do not change. If the reservoir pore pressure is increased at this time, the original pores and fractures will be affected. Expansion will greatly ...

AI Technical Summary

Problems solved by technology

However, the existing technologies all emphasize real-time operations, and there are no other processes between perforation and fracturing. At this stage, the reservoir stress state, seepage form, and fracture pores do not change. If the reservoir pore pressure is increased at this time, the primary pores and fractures will be affected. Expansion will greatly improve the efficiency of main fracturing in the later stage, and bring about a multiplier effect of increasing production with half the effort