Mechanical descaling operation
A scale diagnostic job confirmed the presence of scale across the
production tubulars and perforated interval, and a steep production decline had
been observed over six months, which prompted a mechanical descaling
High-pressure jetting cleanout was conducted with a 2 7/8-in Jet Blaster
engineered high-pressure jetting service tool and jetting sterling beads at 2.5
bbl/min while maintaining a differential pressure of 2,500 psi [17.2 MPa]
across the downhole jetting nozzles and with full fluid circulation at the
surface. This operation and subsequent cleanouts increased operational
efficiency by 30%.
Operational time reduced by 40%
After the mechanical descaling operation, an abrasive perforating
treatment was conducted to enhance injectivity for further stimulation
treatment. Real-time gamma ray depth correlation enabled by the ACTive PTC tool
saved an additional run. Abrasive perforating was performed at 3.75 bbl/min
liquid rate and 600 ft3/min gas rate while keeping the optimum
differential pressure across the ABRASIJET hydraulic pipe-cutting and
perforating service tool. The operational capabilities for mechanical descaling
and abrasive perforating operations were confirmed in sour gas wells with
bottomhole temperatures up to 310 degF [154 degC] by using the ACTive PTC tool.
The implementation of this technology reduced operational time by 40% for the
operator compared with standard practices.