THE TECHNOLOGY OF HYDRO-SAND BLASTING PERFORATION IN WELLS WITH ABNORMALLY HIGH RESERVOIR PRESSURE USING COILED TUBING

Abstract

Areas of application of coil tubing or columns of flexible pipes are quite diverse. During the underground repair of wells carry out current and major repairs, impact on the reservoir and margin zone. The use of the flexible pipe column has made a positive change in the practice of drilling oil and gas wells, especially at their completion, as well as works on hydropower perforation. The article suggests the technology of hydro sandblasting perforation in wells with abnormally high formation pressures with the use of coiled tubing with pressure drawdown and overbalance, which will help to familiarize oil and gas industry specialists with the advanced technology of stimulated completion of productive horizons. Schemes of wellhead equipment and process equipment for hydro sandblasting perforation using coiled tubing in wells with abnormally high reservoir pressures have been developed and their operating principles have been described in detail. The proposed schemes are recommended to be used as typical for hydro sandblasting perforation with pressure drawdown and overbalance of the productive horizon. Conclusions are made concerning expediency of carrying out works on the technology described in the article with the purpose of prevention of sealing and swelling of the bottomhole zone rock in case of ingress of the sand-carrier fluid during the process of perforation.