"Dynamic underbalance" technique for increased productivity
Minimize or eliminate perforation damage and increase productivity
PURE Perforating for Ultimate Reservoir Exploitation system optimizes the well dynamic underbalance—the transient underbalance just after creation of the perforation cavity. The software specifies a unique perforating system and optimum completion process. This controls the optimum dynamic underbalance rather than relying on the estimated reservoir pressure. This technique has been successfully performed in hard- and soft-rock formations, oil and gas reservoirs, and sandstones and carbonates.
Improve operating efficiency
An Alaskan water injection well was performing below expectations. The 90 ft of perforations were taking 17,500 B/D. Analysis of the well and reservoir conditions by PURE design software resulted in a job design using 3 3/8-in. guns and PowerJet deep penetrating shaped charges.Although only a 20-ft section was perforated, the injection rate increased to 25,000 B/D. The injection pressure remained approximately the same or slightly lower. The injection profile shows clearly the PURE perforations were taking 93% of the total flow for an improvement of 493% in the contribution rate.Two low-permeability (1-mD) gas wells in the Weber formation of Wyoming were perforated with PURE technology at initial overbalances of 3000 and 3700 psi. Both wells flowed naturally at 5.5 and 3.8 MMscf/D, respectively, without the acid stimulation usually needed to obtain clean perforations. The wells were tubing-conveyed perforating permanent completions.
Benefits
- Minimize or eliminate perforation damage and increase productivity
- Enhance acidizing and hydraulic fracturing operations and treatment results
- Minimize disruption of the cement/sandface hydraulic bond
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