| For a reservoir, at last stage of water drive, the water content is very high. For enhancing the recovery ratio, available reserve and improving the oil displacement efficiency, the technology of the polymer flooding had been developed, and it now become more important than other technology. At Daqing oil field, the artificial lift of the polymer flooding are the beam unit, PCP and ESP, because of the high viscosity of produced fluid of the polymer flooding and high liquid level, the period of the pump inspection became short. For the high capacity well and enhanced producing ratio well after fracturing, before work over, it muse be killed. It will contaminate the formation, then drop the liquid producing capacity and the polymer flooding efficiency. The 253-parker and relevant self-contained valve designed and be used by the Daqing oil field is not suitable for the pump inspection of the polymer flooding, there are same problem at application on site.At other domestic oil field, Dagang, Shengli and Huabei,there are same problem with Daqing oil field for the snubbing service of the ESPAt the foreign oil field, the permanent parker and self-contained valve are used to achieve the goal of the snubbing service. Recently the removable parker and self-contained valve are applicated morely, but there are still problem with it's self-contained equipment. The relvant technology of the beam nuit haven't been developedFor keeping the layer energy, avoiding the formation contaminant, saving the cost of the well-killing and well-flushing and worker's health, a new technology of snubbing service must be developed to suit the polymer flooding. To solve the above problem, a new snubbing service technology were clarified in this paper, the removable parker, valve and other improved self-contained equipments were used to achieve the aim of the snubbing service, also offer the enough channel for technology of the fraturing, logging, well-flushing and acid treatment.
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