Multi-stage multi-stage reciprocating fracturing method and device for horizontal well

Abstract

The present application provides a multi-stage multi-stage reciprocating fracturing method and device for a horizontal well. The method includes the following steps: dividing the fracturing string into n fracturing sections. The first-level fractures are formed by fracturing the first fracturing stage. The second-level fractures are formed by fracturing in the second fracturing stage. The first fracturing section is refractured to form the first and second level fractures. By analogy, the nth level fracture is formed by fracturing the nth fracturing stage; the (n‑1)th level fracture is formed by refracturing the (n‑1) fracturing stage. By analogy, the first n-level fractures are formed by refracturing the first fracturing stage. The nth fracturing stage is refractured to form the nth second-level fracture; the (n‑1)th fracturing stage is refractured to form the (n‑1)th third stage fracture. By analogy, the second fracturing stage is refractured to form the second n-level fractures. By analogy, finally the nth fracturing segment is refractured to form nth grade fractures. The invention can effectively eliminate or weaken the interference of the longer fractures produced in the multi-stage fracturing of the horizontal well to the fractures produced in the subsequent fracturing.

Description

technical field [0001] The application belongs to the technical field of hydraulic fracturing for oil and gas stimulation measures, in particular to a multi-stage and multi-stage reciprocating fracturing method and device for a horizontal well. Background technique [0002] With the development of my country's petroleum industry, the development of low-permeability oil and gas reservoirs is gradually increasing. Horizontal wells are more and more applied to low-permeability oil and gas reservoirs because of their advantages such as strong penetration ability, large oil exposure area, and high degree of reservoir production. In the development of permeable oil and gas reservoirs. [0003] The staged fracturing technology of horizontal wells is an important technical measure to increase the production of oil and gas fields in my country. Reservoir stimulation through staged fracturing technology can significantly improve the seepage conditions of oil and gas around horizontal w...

AI Technical Summary

Problems solved by technology

When conventional multi-stage fracturing technology is used to fracturing a horizontal well, the long hydraulic fractures that have been produced will have a certain impact on the surrounding stress field within a certain range, thus changing the minimum value of the formation around the hydraulic fracture. The direction of the main in-situ stress will affect the result of subsequent hydraulic fracturing, and it is easy to cause the hydraulic fractures produced by subsequent fracturing to deviate from the expected fracture trajectory, that is, the subsequent hydraulic fractures will be deflected, resulting in actual hydraulic fractures and expected hydraulic fractures. large deviation

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