Research On The Design Theory And Method Ofartificial Lift Technology For Special Pump

With the continued exploitation of world oil, the production conditions of pumping wells become more and more complex. The sand production, gas content, heavy oil and deviated wells are all important problems that bring a lot of resistance to oil production. At present, there have been a variety of special pumps to meet the harsh production environment at home and abroad. The adverse effects of these factors must be eliminated in order to improve pump efficiency and protect the regular oil production.In this paper, the conventional pump, travelling barrel sand control pump, hydraulic feedback heavy oil pump, immersed pump and deep well pump are studied, and the force analysis of the pumps are conducted, the related force models are established and the software of optimization of lift technology for special pumps is compiled, which can be used to analyze the working conditions and optimize production parameters. Example shows that compared with conventional pumps, For the travelling barrel sand control pump, the load of the rod bottom and the system efficiency change small. Because of the special structures of hydraulic feedback heavy oil pump and immersed pump, there is a downward hydraulic feedback force at down stroke, which ensure their good adaptability for heavy oil well, Compared with the conventional pump, lever under the column load-stroke difference between the system efficiency decreases; For the deep well pump, when at up stroke, as the upper piston diameter is smaller, the action area of liquid column is smaller, the maximum load is reduced and the purpose of reducing load is achieved; when at down stroke, the action of submergence pressure is helpful for the downward of rod column and the load difference is reduced. Compared with the other four pumps in the conditions being equal, the deep well pump's load difference is smallest, and the system efficiency is biggest.