DEVELOPMENT AND APPLICATION OF TEMPERATURE-CONTROL SHORT-CIRCUIT TYPE THERMAL WELL-FLUSHING WAX-REMOVAL LEAK-RESISTANCE STRING

This paper gives an introduction on the problems existing in hot-water well-flushing wax-removal in Kelamayi Oilfield.In order to solve these problems,the temperature-control short-circuit type thermal well-flushing wax-removal leak-resistance string is developed by using of temperature-control components.Indoor and field testing results show that it realizes the temperature-control short-circuit well-flushing by flushing fluid with certain temperature.The temperature-control packer is used to prevent flushing fluid from injuring oil formation by sealing the annulus between tubing and casing.Compared with conventional method,it can save 3O~5O percent of flushing fluid volume,and reduce by 30~50 percent of operating time.