Secondary Completion in Water-Injection (RPM) Wells
A technology for retrofitting or upgrading a well after its initial commissioning or after a workover: installing additional equipment or redesigning the bottomhole zone to optimize injectivity and the distribution of injected water across the layers.
Advantages
- Higher well injectivity. Achieved by optimizing the bottomhole-zone design and eliminating low-permeability zones.
- Precise injection distribution across layers. Water can be delivered selectively to the required intervals, including in multi-layer reservoirs.
- Lower risk of water breakthrough. Control over the direction of filtration flows prevents premature watering of producing wells.
- Longer well service life. Achieved by isolating problem intervals (e.g. zones with high corrosion or sand production) and using protective assemblies.
- Operational flexibility. Injection modes can be changed promptly and individual layers switched off and on without a major workover.
- Economic efficiency. Lower costs than drilling new injection wells while maintaining or increasing injection volumes.
Specifications
- maximum outer diameter: 122 mm
- differential pressure rating: up to 35 MPa
- validation: V3
- polished-bore receptacle length: 1700 mm
- setting method: hydraulic
- size range (casing): 146
Application area and experience
- RPM injection wells. Mature fields with declining production and a need to maintain reservoir pressure.
- Multi-layer reservoirs. Where differentiated injection is required across intervals with different reservoir properties.
- Areas with heterogeneous reservoir structure. Injection has to be redistributed to engage poorly drained zones.
- Wells after a workover. After a major workover, injectivity is restored or the operating scheme revised.
- Complicated conditions. High water cut, mechanical-impurity production, corrosion — specialized completion assemblies are required.
