宽幅电潜泵举升工艺在致密油水平井应用分析

近几年来,鄂尔多斯致密油藏得到了大规模开采,水平井是主要开采方式,其产量为初期高,中后期递减快。大多数致密油水平井从前期排液到后期稳定生产,需要不断调整泵径,以适应产量变化要求。为了研究致密油藏水平井全生命周期的新型举升工艺,探索排采一体化生产运行模式,在鄂尔多斯致密油油藏(长7层)选择7口丛式水平井,进行宽幅电潜泵无杆采油试验。试验表明:彻底消除杆管偏磨,井口占地面积较少,智能化控制程度较高。宽幅电潜泵可满足150～10 m³/d的产量变化要求,实现了排采一体化。但是,试验中也频繁出现堵转停机、过载停机、高温停机等故障。结合4口井的宽幅电潜泵机组拆检结果,从结蜡、结垢、井下异物、气体段塞等角度分析故障原因。为宽幅电潜泵举升工艺在致密油水平井中推广应用提供参考。

Analysis on the Application of ESP FLEX Pump LiftingTechnology in Tight Oil Horizontal Wells

In recent years, the tight oil reservoirs in Ordos have been exploited on a largescale. Horizontal wells are the main method of exploitation. The output is high in the initial stage and decreases rapidly in the middle and late stages. Most of the tight oil horizontal wells need to continuously adjust the pump size from the early drainage to stable production in the later stage to meet the changing requirements of production. In order to study the new lift-up technology for the full life cycle of tight oil horizontal wells and explore the integrated production and operation mode of drainage and production, in the ordos tight oil reservoir(long 7 layers), 7 cluster horizontal Wells were selected to carry out the ESP FLEX pump rod free production test. The test results show that the eccentric wearing of rod and tube is eliminated, the area occupied by the wellhead is less, and the degree of intelligent control is higher. The wide-width electric submersible pump can meet the requirement of output variation of 150 ～ 10 m³/d and realize the integration of drainage and production. However during the test, the faults such as locked-turn stop, overload stop and high temperature stop frequently occurred. Combined with the disassembly and inspection results of the wide-width electric submersible pump unit in 4 wells, the fault causes were analyzed from the aspects of wax formation, scale formation, underground foreign matter and gas slug. It provides a reference for the application of wide width electric submersible pump lifting technology in tight oil horizontal wells.