Multi-segment multi-stage reciprocating fracturing method and apparatus of horizontal well

Abstract

The application provides a multi-segment multi-stage reciprocating fracturing method and apparatus of a horizontal well. The method comprises the following steps that: a fracturing tubular column is divided into n fracturing segments; the first fracturing segment is fractured to form a first first-stage fissure, the second fracturing segment is fractured to form a second first-stage fissure, and the first fracturing segment is fractured again to form a first second-stage fissure; the rest is operated in the same manner and thus the nth fracturing segment is fractured to form an nth first-stagefissure and the (n-1)th fracturing segment is fractured again to form an (n-1)th second-stage fissure; the rest is operated in the same manner and thus the first fracturing segment is fractured againto form a first n-stage fissure; the nth fracturing segment is fractured again to form an nth second-stage fissure and the (n-1)th fracturing segment is fractured again to form an (n-1)th third-stagefissure; the rest is operated in the same manner and thus second fracturing segment is fractured again to form a second n-stage fissure; the the rest is operated in the same manner and thus the nth fracturing segment is fractured again to form an nth n-stage fissure. Therefore, the interference on the fissure caused by the follow-up fracturing by the long fissure caused in the multi-segment fracturing of a horizontal well can be eliminated or weakened effectively.

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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