Publications

DL-1A well has been drilled vertically with Total Depth of 11,350 ft. MD and penetrated T Sand Formation. The bottom-hole temperature is 375°F while the bottom-hole pressure is 7,500 psi. The same sand formation has been tested in RD-1, and resulted in low gas rate. Refer to reference well RD-1 and well log analysis, DL-1A sand formation is known as low productivity risk, thus well stimulation is required to enhance productivity. Hydraulic Fracturing is the most common well stimulation applied to sandstones with low permeability in order to improve well productivity. Special fracturing fluid and proppant are required to satisfy HPHT environment. High temperature requires special fracturing fluid that will not breakdown at temperatures of 375°F. Fluid rheology tests show that special designed fracturing fluid for HPHT has capability to transport proppant at temperatures of up to 375°F. The proppant is intended to hold the stress which is expected to be around 10,000 psi. Proppant crush test has been conducted for intermediate strength bauxite proppant and it complied with API RP-56/58/60. Main fracturing at lower-sand experienced premature screen-out with total pumping of 15% proppant from the volume design. In upper-sand, fracturing was successfully conducted by pumping all 78,184 lbs of proppant at 18 bbl per minute of pumping schedule. Some improvements were applied during the fracturing in upper sand such as: double perforations, to get higher perforation densitywhichsignificantly reduced entry friction, and less aggressive sand concentration. This paper is intended to share the laboratory testing, treatment design, implementation and challenges in job execution of hydraulic fracturing in gas wells with low permeability under HPHT conditions. The paper is a case study of sandstone-fracturing pilot project in DL-1, a HPHT well, which is still uncommon for hydraulic fracturing projects in Indonesia. Keywords: hydraulic fracturing, high pressure high temperature (HPHT), low permeability, sandstone