Development Of Fixed Sealing Special Type Oil Pump

At present, with the development of heavy oil reservoir of liaohe oilfield, distribution of high pour-point and high heavy oil Wells is scattered, unable to form a gas injection pipe network, only by the method of mixed liquid in the production. Used in the production process of hollow subsurface pump is not suitable for the use of high condensation of heavy oil Wells, widespread pump efficiency is low, the problem such as short pump inspection cycle.Aiming at the demand of high pour-point and high stability of heavy oil well production,a fixed sealed special hollow subsurface pump is developed, using the separation of gland and plunger way to solve the problem of paraffin deposit, at the same time has the characteristics of sand control and easy to install. Material selection of structural innovation and can reduce cost, and can increase the service life of pump.According to the production data of high pour-point and high viscous crude Wells completed the fixed special sealed hollow pump barrel and plunger pump, turn out oil joint and the fixed seal valve assembly structure design and parameter determination, through the well under the high production plant for actual use, found the pump failure, sand card and pump barrel deformation problem. Through analysis and experiment, find out the reason of the pump failure is caused by poor cementing quality, and gives the Suggestions; Can design a next stroke closure at the top of the pump barrel pump cover system; Reverse in the form of experiment proves that the pump barrel is the main reason of the deformation caused by carbonitriding process stress response.This paper mainly introduces the fixed sealed special structure design of hollow rod pump, pump efficiency and the actual products analysis, experiment data and Suggestions for improvement. A can be used for the high condensation is developed, high efficient production of heavy oil well fixed sealed special hollow subsurface pump.