A method for selecting a perforation position of a coal seam roof horizontal well for improving a coal seam fracturing reconstruction volume
By establishing a comprehensive evaluation index model for the location of perforations in horizontal wells in the coal seam roof, the problem of improper perforation location selection was solved, and the fracturing effect and coalbed methane recovery rate were improved.
Patent Information
- Application Number
- CN202111312381.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-11-08
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2041-11-08
AI Technical Summary
The existing technology lacks a sound theoretical basis for selecting the location of perforations in horizontal wells for fracturing in coal seams, which leads to increased pump pressure and difficulties in adding sand during fracturing operations, thus affecting the effectiveness of the fracturing.
A comprehensive evaluation index prediction model for the location of perforations in horizontal wells in the coal seam roof was established. The perforation locations were designed using data on the relative distance between the horizontal section of the horizontal well and the coal seam, data on clay content, data on cementing quality, and data on the distance between the perforation location and the casing coupling.
It increased the volume of horizontal well fracturing in the coal seam roof, reduced problems such as excessive pump pressure and difficulty in adding sand, and improved the recovery rate of coalbed methane.