KS-HZ, onshore producer well, is the first horizontal well of one of operators in Sumatera, Indonesia. The well has been drilled since early 2020 but suspended due to drilling problems. The operator then decided to side-track drill and complete the well with multistage hydraulic fracturing. This project is planned to unlock oil potential from Telisa Formation (less than 3 mD permeability) and boost production performance. Transverse multistage hydraulic fracturing technique is widely used to enhance production from low to medium permeability formation, but it can be quite a challenge when applied to thin T formations (40 feet of thickness) that have soft and shaly sandstone properties. In this well, without adequate completion technology approach and over flushing the proppant in each single stage will have negative impact on production performance.
This paper will describe consideration of multistage fracturing design, a technology approach that used in the completion execution, and efficiency improvement. This includes coiled tubing (CT) and fracturing operations that covers: CT memory logging, CT wellbore clean up, stage optimization, stage spacing, CT abrasive jetting perforation, hydraulic fracturing, CT milling, and CT clean-out. In addition, the utilization of fiber optic enabled CT with pressure, temperature, tension and compression, and gamma ray modules enables operator to monitor real-time downhole parameter for accurate perforation depth placement within the small gap window. It will also help to calibrate frac design on each stage from the advantage of live downhole pressure monitoring during Diagnostic Fracture Injection Test (DFIT) analysis. CT abrasive jetting perforation was also selected to maximize reservoir contact and to reduces near-wellbore friction that minimize the possibility of proppant screen out.
A total of 7 stages of propped hydraulic fracturing method has been successfully placed without any placement failure. Approximately 881,000 lbs of proppant pumped into the Telisa Formation.
As a final point, this first deployment of multistage hydraulic fracturing with fiber optic enabled Coiled Tubing is proven to be unique solution to help the operator to gain additional production from challenging Telisa formation. This success elevates operator's confidence for future project and becomes golden experience for the nation to develop future multistage fracturing in same Telisa Formation across Sumatera Island.