Device and method for continuous and step-by-step hydraulic fracturing of directional long borehole in thick and hard coal seam
By designing multi-stage fracturing sandblasting equipment and packers, and using recyclable packers, the problems of low construction efficiency and sealing failure in existing directional long borehole continuous segmented hydraulic fracturing devices for thick and hard coal seams have been solved, achieving efficient and reliable layered fracturing effect and low-cost construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 安徽恒源煤电股份有限公司
- Filing Date
- 2026-05-21
- Publication Date
- 2026-07-17
AI Technical Summary
Existing directional long borehole continuous segmented hydraulic fracturing equipment for thick and hard coal seams suffers from problems such as complicated operation procedures, low construction efficiency, easy damage to packers, seal failure, and fracturing fluid leakage. It is difficult to meet the durability requirements for repeated use in segmented fracturing, thus increasing project costs.
The design employs a multi-stage fracturing blasting and packer system. By matching the ball dropper with the sliding sleeve and central tube of different diameters, the fracturing blasting and packer can be opened irreversibly in sequence during a single run of tubing. Combined with a retrievable packer, it has an unsealing and recovery function. The system uses slip teeth, one-way locking rings, and shear pins to ensure sealing performance and construction efficiency.
It improves construction efficiency, reduces the number of times the tubing string is pulled out and the operational risks, lowers the construction cost per well, has strong adaptability, avoids sealing failures and interlayer flow, and ensures the effect of stratified fracturing.
Smart Images
Figure CN122407152A_ABST