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A METHOD OF CALCULATING PRESSURE DROP AT THE INLET OF PUMP DURING NEGATIVE PRESSURE PRODUCTION

Zhang Jifen(Daqing Petroleum Institute)  
Negative pressure production is an effective technology used in oil production engineering to increase productivity.The essence of negative pressure production technology is to induce a negative pressure at the inlet of a pump through rapid dischage within the fully filled tubular system.To calculae the value of negative pressure during negative oil production proccss,is on the theoretical basis of productivity prediction,production effectiveness analysis and evaluation:it is also an important problem that needs urgent solution for oil production engineers.In this paper,on the basis of the principlc of fluid mechanics and the practical situation of negative pressure production in the oil field,the basic equations describing the proccss of negative pressure production are given and solved.The formulae calculating pressure drop at the inlet of pump is developed. Combing with the specific well data in Liaohe oil field,the negative pressure formed instantaneously at the inlet of the prmp is calculated.So the results can be rsed to direct the design and the productivity prediction of negative pressure production engineering in the oil field.
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