Method and device for determining crack initiation pressure of multi-cluster temporary plugging fracturing of horizontal well

By correcting the traditional single-cluster fracture pressure calculation model and considering the stress interference between multiple clusters of fractures, a new model of temporary blocking fracturing and fracture pressure calculation of horizontal wells of shale gas reservoirs was established, which solved the problem of failure to accurately predict fracture pressure in the existing technology, and achieved more accurate fracturing effect and controllability of project implementation.

CN119712051APending Publication Date: 2025-03-28CHINA NAT PETROLEUM CORP
7 Cites 0 Cited by

Patent Information

Application Number
CN202311280690.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The prior art is difficult to accurately predict the cracking pressure required for the cracking of the perforation clusters that do not crack when the horizontal wells of shale gas reservoir are temporarily blocked in sections, resulting in unsatisfactory fracturing results.

Method used

By comprehensively considering the stress interference between multiple clusters of fractures, the rupture pressure calculation model in the traditional single cluster situation is corrected, a new shale gas reservoir temporary blocking fracturing and fracture pressure calculation model is established in the horizontal well segmented multi-cluster horizontal well, and the fracture pressure of the unbreakable perforation cluster is calculated.

Benefits of technology

The accurate calculation of the fracturing pressure of the shale gas reservoir horizontal well is achieved in sections, multiple clusters of temporary blocking fracturing and cracking is improved, and the fracturing effect and controllability of project implementation is improved.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a method and a device for determining crack initiation pressure of multi-cluster temporary plugging fracturing of a horizontal well. The method comprises the following steps: collecting crustal stress data and engineering data of a target gas well; according to the crustal stress data and the engineering data, the half lengths and net pressures of N fractured and extended fractures in the fracturing section of the target gas well are calculated respectively; calculating an induced stress field component of each fractured extension crack according to the crack extension half length and the crack net pressure of the fractured extension crack; according to the induced stress field components of the N fractured extension fractures, determining the stress field component of the non-crack initiation perforation cluster after interference in the target gas well fracturing section; and calculating the crack initiation pressure of the non-crack initiation perforation cluster at the beginning of temporary plugging according to the stress field component of the non-crack initiation perforation cluster after interference.
Need to check novelty before this filing date? Find Prior Art