Fracture Network Fracturing Technology

Abstract

The invention discloses a seamed net fracturing technological method. The method includes the following steps that 1, before fracturing, high-viscosity fracturing fluid (like linear gel) replaces a fractured interval in a wellhole; 2, low-viscosity fracturing fluid (like slickwater) is used in a wellhead, and the high-viscosity fracturing fluid in the wellhole is squeezed into the stratum at the pressure of being higher than formation fracture pressure; 3, after fracturing of the stratum, the low-viscosity fracturing fluid is used as fracturing fluid for construction; 4, the high sand ratio section where sand adding is to be ended or the final high sand ratio section is fractured, and the high-viscosity fracturing fluid is used for carrying sand; 5, sand adding is completed, clear water or the slickwater is used for replacement, and fracturing is ended. According to the method, the fluid with viscosity is used for fracturing the stratum first, an independent crack is formed by the stratum and the wellhole, it can be guaranteed that the crack has a sufficient width, a high-concentration propping agent is made to enter the crack smoothly, the supporting crack width of the root portion of the crack is increased, higher flow guiding capacity is achieved, and therefore higher oil and gas production is obtained.

Description

technical field [0001] The invention relates to a fracturing process for oil and gas field development and application, in particular to a fracture network fracturing process. Background technique [0002] With the development of shale gas, coalbed methane, and tight gas, fracturing technology has been applied more and more, and fracturing stimulation technology has become a necessary means to develop low-permeability and unconventional oil and gas reservoirs. Most of the current fracture network fracturing or volume fracturing techniques in shale gas development emphasize the number of fractures and contact area formed by fracturing in the formation, but do not consider the shape of the fracture root in the wellbore. There are also many fractures at the connection between the root of the fracture network and the wellbore, which not only affects the entry of proppant into the formation during fracturing, but also affects the output when it is put into production later. Con...

AI Technical Summary

Problems solved by technology

Most of the current fracture network fracturing or volume fracturing techniques in shale gas development emphasize the number of fractures and contact area formed by fracturing in the formation, but do not consider the shape of the fracture root in the wellbore