"ANALYSIS OF WELL COMPLETION COMPLICATIONS AND THEIR ELIMINATION IN THE KARACHAGANAK FIELD"

Abstract

"By examining well completion issues, the paper will demonstrate the importance and beneficial effects of using multi-stage selective acid treatment technology to regulate reservoir development. The original goals for the Karachaganak field were a review of the field’s operating conditions, the building of the first plant for producing gas and gas condensate, and the design of the production circuit. After the separation of products contract was signed, new goals were added, such as accelerating oil well commissioning, increasing gas condensate production over the long term, and pumping at least 40 % of the gas back into the layer. Numerous well completion techniques have been improved thanks to technical developments, including applying tubing while sealing metal-to-metal threaded connections, omitting the use of a circulation valve above the packer, and utilizing a downhole shut-off valve. The field development project’s Phase 2M got under way in 2003. An innovative well completion technique was used in the Karachaganak field, which used acid fracturing in an open hole with packers and circulation valves to separate the intervals. In 8 horizontal wells, the multistage stimulation approach has proved effective, saving both time and money. In one of the wells, selective stimulation was made achievable by an acid treatment plan that met zonal injectivity standards. Increased well productivity, flow distribution, gas, water, and drawdown control have all been benefited by multistage selective acid stimulation. "