海上大液量井电泵气举衔接式采油系统设计

DESIGN OF COHESIVE SYSTEM BETWEEN ELECTRIC SUBMERSIBLE PUMP AND CONTINUOUS GAS LIFT IN HIGH PRODUCTIVITY WELL

针对潜油电泵检泵周期短、修井周期长,严重影响海上这种单井产量高且生产井少的油田产量这一生产技术难题,引入Hubert提出的潜油电泵与气举组合举升的思想,采用一趟管柱下潜油电泵与气举两种工艺进行衔接式生产,提高油井开采时率。依据相同排量条件下气举注气点深度与潜油电泵泵挂之间关系,提出了气举在上、电泵在下的常规管柱和电泵在上、气举在下的Y型管柱。并以油气水三相流入动态模型为基础,正确预测电泵井与气举井井筒压力温度剖面,建立了潜油电泵节点系统设计方法以及变地面注气压力法设计气举阀分布。海上某井实例模拟分析证实了潜油电泵与气举可采用同一油管柱,且当地层参数改变时,可择优选择其一系统工作,较好的保证了生产的连续性。对于海上同一平台既有电泵井又有高压气井解决类似的问题具有重要的现实意义。

The pump detection period of Electric Submersible Pump(ESP)is short and the frequency is high,which would have a serious effect on oilfield output for only a few high productivity wells in one oilfield.The combined artificial lift proposed by Hubert was presented.The ESP and gas lift valves were installed in one tubing string.In general case,ESP works and the gas lift is a reserve artificial lift.When ESP is checking,the gas lift begins to work.So the production time efficiency is increased.Accordion to the relationship between the injection point of gas lift and setting depth of ESP,two downhole strings were presented.If setting depth of ESP is deeper than the injection point,a new Y-type downhole string is given.Conversely,the conventional downhole string is used.Based on inflow performance relationship of oil-gas-water three phases,and respectively predicting pressure profile and temperature profile in ESP well and gas lift well,the technological design of ESP was given by use of the node analysis method,and Camco or Winkler method were used to design gas lift valve spacing.The field case analysis showed that ESP and gas lift could use one tubing string.This study results have the important reference to solve the similar problem in offshore oilfield which has ESP well and high pressure gas well.