Dagang Oilfield Oil Technology Research Institute independently developed a new type of tubing string to avoid the existence of the original string of many problems in the two wells test results better, and its core components bidirectional pump and double Versaille pump, both have won the national Utility model patents. At present, the conventional sucker rod of Dagang Oilfield consists of ordinary sucker-pump and oil drain, but there are some defects in the function of the pipe string. Ordinary pump can not be carried out positive cycle washing well, check the pump red sand can only be made after the original well string can be washed under the tubing operations, time-consuming work. On the other hand, the blow-offs on the pipe string are often mistakenly opened due to the performance and quality problems to stop the check-up pump, causing unnecessary losses and investment to the oilfield production and workover work. To this end, Dagang Oil Production Technology Research Institute has developed two new pumping string. One for the two-way through the tubing string, the main supporting tools for the two-way through the pump, compared with the ordinary pumping string, with positive circulation well washing, but also can deepen the original well string for positive red sand, column can be achieved Do not install the drain to workover oil drain effect. The other is a double Versaille pumping string, the main supporting tool for the double Versaille pump. Compared with ordinary pump, the pump can not only prevent sand blockage, wax blockage and air lock, but also has the advantages of large inlet hole area, positive and anti-flushing wells, prolonging inspection pump cycle and improving pump efficiency.
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