One trip string completes perforation, unplugging and production, with single-well production increase ≥ 80%.
Based on the unique advantages of jet pumps, such as no moving parts, strong plugging resistance and high adaptability, combined with the characteristics of hydraulic abrasive jet perforation, our company has independently developed and perfected the integrated technology of "Hydraulic Abrasive Jet Perforation and Jet Unplugging & Sand Cleanup".
This technology organically integrates two originally independent stimulation treatments. With only one trip string, it achieves multiple functions including perforation, unplugging, sand cleanup and fluid flowback for production testing. It reduces operation steps, shortens operation time and lowers operation cost, forming an efficient combination of "perforation, unplugging, sand cleanup and fluid flowback for production" for various types of oil and gas wells.
The integrated process string for hydraulic abrasive jet perforation, cleaning, unplugging and production consists of tubing, pressure-controlled jet pump assembly, hydraulic abrasive jet perforating gun, check valve and other components.
Process Features:
High Efficiency: One trip downhole completes two tasks, significantly shortening construction time and reducing costs.
Low Formation Damage: Immediate unplugging minimizes secondary formation damage, especially protecting sensitive reservoirs.
Excellent Performance: New perforations are instantly opened, enabling deep reservoir communication and greatly enhancing perforation conductivity and stimulation results.
Strong Adaptability: Particularly advantageous in complex well conditions and special reservoirs (low pressure, low permeability, mature wells).
Safer and More Environmentally Friendly: Reduces operational steps, chemical usage, and tubing trips, improving environmental performance and operational safety.
Comparison with Conventional Perforation:
| Comparison Item | Hydrajet Perforation &Unplugging Integration | Conventional Bullet Perforation |
| Perforation Parameters | Penetration depth:1.0–1.5m,hole diameter:20–22mm,controllable precision | Penetration depth:0.3–1.0m,hole diameter:15–20mm,low precision |
| Reservoir Protection | No crushed/compacted zones,immediate negative-pressure unplugging (5–11MPa),minimal secondary damage | Causes formation compaction,fracture extension,and potential perforation fluid leakage/contamination |
| Wellbore Impact | No damage to casing/cement ring,extends wellbore life | May damage casing/cement ring,shortens wellbore life |
| Operational Efficiency | One-trip completion of perforation + unplugging,no string movement,direct production | Requires post-perforation scraping,well washing,and pump installation,frequent tripping |
| Adaptability | Strong,ideal for low-pressure,low-permeability,and mature wells | Broad,but underperforms in complex reservoirs |
| Safety &Eco-friendliness | High,reduces trips and chemical usage | Low,more operational steps and environmental risks |
| Comprehensive Cost | High equipment cost, low operation & maintenance/construction cost, and high long-term returns. | Low equipment cost, high operation & maintenance/construction cost, and limited stimulation effect. |
Applicable Reservoir Types and Well Patterns:
1. Oil and water wells where conventional bullet perforation fails to penetrate deeply or
achieves insufficient penetration depth:
① Wells completed with double-layer casing;
② Wells repaired with small-casing patches after damage to the production casing (with double-layer casing in the pay zone);
③ Wells re-perforated after cement plugging;
④ Wells severely contaminated during drilling.
2.High-angle wells, horizontal wells, sidetracked wells, and oil/water wells with high
dogleg severity, especially sidetracked wells.
3. Water injection wells with poor injectivity or significant variations in injection profiles.
4. Unconventional reservoirs: Oil wells in shale oil, tight formations, and ultra-low
permeability reservoirs.
5. Oil wells in sensitive reservoirs and high-permeability reservoirs with high clay content.
6. Coalbed methane (CBM) wells.
7. Geothermal wells.
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