低产低效井合理间开制度研究

Research on the reasonable intermittent production system of low production and low efficiency wells

元城油田三叠系延长组中长6和长8油藏是典型的“低压、特低渗、中-低产”油藏,低产低效井较多,目前现场多采用间开12 h为主的生产方式,适应性差,制约着油田的开发效益。为解决上述问题,通过对低产低效井动液面的连续监测,研究了沉没度的变化规律以及泵效和沉没度之间的关系,确定了以泵效低于20%作为关井的临界点,以关井后液面上升速率小于1 m/h作为开井的临界点,依据该原则优化了不同层系、不同液量井的间开制度。实践表明,优化后的间开制度不仅能够保证单井产量基本不变,而且提高了抽油泵效,大幅度节约了电能,整体上提高了开发效益。

The Chang 6 and Chang 8 reservoirs in the Triassic of Yuancheng oilfield are typical“low pressure,ultra-low permeability,medium low production”reservoirs.There are many low production and low efficiency wells.At present,the field mainly adopts the production mode of 12-hour interval operation,which has poor adaptability and restricts the development benefit of the oilfield.Based on the continuous monitoring of liquid level in low production and low efficiency wells,the change rule of submergence and the relationship between pump efficiency and submergence was studied.The critical point of shut in is determined to be the pump efficiency less than 20%,and the critical point of open well is the rise rate of liquid level less than 1 m/h after shut in.According to this principle,the interval opening system of wells with different layers and different fluid volumes is optimized.The practice shows that the optimized system can not only ensure the output of a single well basically unchanged,but also improve the efficiency of the oil well pump,greatly saving the electric energy,and improving the development efficiency as a whole.