P3
Postperforating treatment
Remove debris from existing perforations in permeable rocks and increase productivity or injectivity.
PURE
Clean perforations system
Overview
Maximize productivity by minimizing perforation damage with dynamic underbalance
Harness the power of dynamic underbalance to consistently minimize or even eliminate perforation damage.
The PURE™ clean perforations system is designed to optimize your well’s dynamic underbalance, the transient underbalance that happens right after creating the perforation cavity. With our proprietary design software, we can specify a custom perforating configuration and the optimal completion process for your well.
Unlike conventional methods that rely on estimated reservoir pressure, our approach generates and controls the dynamic underbalance. The PURE system has been successfully used in various environments, including hard- and soft-rock formations, oil and gas reservoirs, sandstones, and carbonates. Plus, it minimizes disruption to the cement or sandface hydraulic bond.
Our proprietary software designs a unique perforating and completion process tailored to generate and control the optimal dynamic underbalance for your specific well. It takes into account the reservoir, wellbore fluids, perforating hardware, and completion geometry.
Applications
- Hard- and soft-rock formations
- Oil and gas reservoirs
- Sandstones and carbonates
Benefits
Dynamic underbalance to clean perforations, improving productivity or injectivity
Minimal or no initial static underbalance requirement
Precise downhole pressure control
High data-rate pressure gauge for accurate readings
Diverse formations: hard and soft rock, oil, gas, sandstone, and carbonate
Minimized disruption of the cement and sandface hydraulic bond
Features
- Minimizes or eliminates perforation damage using dynamic underbalance
- Generates and controls dynamic underbalance independent of estimated reservoir pressure
- Uses proprietary software to design unique perforating and completion process
- Removes perforation debris and crushed-zone damage
- Ensures efficient communication between the reservoir and wellbore for enhanced operations
- Maximizes production through optimized perforation cleanup
- Conducts extensive experiments to validate dynamic underbalance effectiveness
The PURE clean perforations system optimizes the dynamic underbalance, the transient underbalance produced just after the perforation cavity is created. On the graphic, differential pressure (between the simulated wellbore pressure and the pore pressure) for tests 1 through 4 showed that the maximum dynamic underbalance varied from 400 to 1,300 psi.
How It Works
Remove perforation debris and crushed-zone damage
The PURE system’s perforation cleanup process doesn’t depend on the initial underbalance like conventional methods do. Extensive experiments at the SLB Productivity Enhancement Research Facility (PERF) have shown that it’s the maximum dynamic underbalance—not the initial underbalance before the guns fire—that governs perforation cleanup. To achieve this optimal dynamic underbalance, our design method considers the reservoir, wellbore, fluids, perforating hardware, and completion geometry.
Cleaner perforations mean better communication between the reservoir and wellbore, enhancing acidizing and hydraulic fracturing operations and, ultimately, maximizing production.
Case Studies
Helpful links
About SLB