CRI Performance Optimization
2012
Environmental friendly field development is a key target for Sakhalin Energy in this tough operating
environment. During three years of cuttings injection in a Cuttings Re-injection (CRI) well, injection
rate decreased twice, leading to two screen outs and consequent perforation of back-up zones.
However domain capacity modeling indicated that injection of a bigger slurry volume should be
possible contrary to reality. Using historical data records (injection pressure, volume and rate), and
step rate injectivity test, an analysis was performed to understand what injection rate is a key
parameter to optimize domain capacity. However the existing injection pumps (1 primary, and 1
backup) were limited to an optimal rate of 2 bpm each. Putting the two injection pumps in parallel
made it possible to achieve the optimal injection rate of about 4 bpm, thereby lowering injection
pressure, and making injection performance mimic domain model expectation.
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