Radial well volume fracturing method

Abstract

The invention relates to the technical field of later-stage exploitation of oil and gas fields, and discloses a radial well volume fracturing method. The method comprises the following steps of 100, selecting a target layer of a well to be subjected to radial fracturing, and determining the horizontal maximum principal stress direction and the horizontal minimum principal stress direction of the target layer; 200, determining the fracturing displacement and the fracturing crack length; 300, determining the number of radial water jet holes according to the fracturing displacement and the fracturing crack length in the step 200; 400, performing directional windowing and radial water jet in the direction forming a certain angle with the horizontal minimum principal stress direction, and executing the jet process till all the radial water jet holes are completed; and 500, after the jet process is completed, executing the fracturing process until all fracturing strips are completed. By means of radial water jet in the vertical well, volume fracturing is achieved in the reservoir section, the purpose of similar horizontal well fracturing is achieved, the fracture swept area is enlarged, oil and gas reserves are effectively used, and compared with conventional one-time fracturing, the single-well yield of a low-permeability oil and gas well can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of post-exploitation of oil and gas fields, in particular to a radial well volume fracturing method. Background technique [0002] At present, most oil and gas fields in China have entered the late stage of exploitation, and it is necessary to tap the potential of old wells to find remaining oil and repeat fracturing and acidification of old wells to increase production to achieve the purpose of effective production. Radial well technology is one of the most effective ways to find remaining reserves in old wells. But for low-permeability oilfields, fracturing is still needed to obtain better development results. At present, the fracturing of radial wells is basically a simple one-time fracturing, the stimulation scale is small, multi-fracture fracturing has not been realized, and the production capacity cannot be effectively released. Contents of the invention [0003] The purpose of the present inventio...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of simple fracturing process and low production capacity in the prior art, and provide a radial well volume fracturing method. In a vertical well, the volume fracturing can be realized in the reservoir section with the help of radial water jets, and the approximate The purpose of fracturing horizontal wells is to expand the affected area of ​​fractures and effectively utilize oil and gas reserves. Compared with conventional primary fracturing, it can greatly increase the single well production of low permeability oil and gas wells

Images