Abstract
To unlock Mishrif reservoir potential in West Kuwait, a new development strategy involving analysis with Distributed Temperature Sensing (DTS) and downhole intervention with instrumented coiled tubing (Active CT) followed by high-rate stimulation by bull-heading has been applied to the tight carbonate formation. The goal was to find a cost-effective stimulation strategy that would increase the number of productive wells through an integrated production enhancement project approach.
The operation encountered various challenges, primarily driven by a high-permeability areas across the open hole, which was detected by DTS. Modifications were made to the CT stimulation procedure, including diversion techniques such as high-pressure jetting, dual injection and the pumping of a near-wellbore fully degradable diverter composed of a customized blend of multimodal particles and degradable fibers to temporarily isolate the highly permeable streaks. Real-time downhole telemetry had a paramount importance in ensuring the injection rate was kept below preset pressure limits and in monitoring downhole dynamics for optimal use of the high-pressure jetting tool. In most of the interventions, following the CT stimulation, a second post-stimulation DTS log was conducted to evaluate the fluid coverage and effectiveness of the diversion strategy allowing for further adjustment of the bullhead stimulation program for an optimum fluid coverage and avoiding the high-intake zones.
