针对常规水平井调流控水筛管完井存在封隔器封隔长度短、封隔段数有限和深井封隔器下入困难等技术难点,开展了水平井砾石充填调流控水筛管完井技术研究.在分析水平井砾石充填调流控水筛管完井技术原理及技术难点的基础上,分析对比不同类型调流控水筛管的优缺点,选用节流嘴式调流控水筛管或流道式调流控水筛管;根据水平井砾石充填调流控水完井的要求,优选聚合物低密度砾石作为充填砾石,并通过试验评价了砾石充填层的封隔效果,结果表明,砾石充填层可以阻止进入井筒内流体的横向流动,起到封隔器的作用;给出了砾石充填工艺,形成了水平井砾石充填调流控水完井技术.该技术在塔河油田A水平井进行了现场试验,与试验前相比,该井产油量提高了411.8%,含水率降低了13.5百分点.研究结果表明,水平井砾石充填调流控水筛管完井技术可以提高调流控水筛管的调控精度,起到稳油控水作用,具有一定的推广应用价值.%Conventional completion techniques involving inflow-control screen in horizontal wells are characterized by short packing intervals,limited packing intervals,difficulties in the installation of packers in deep wells and other technical challenges.Under such circumstances,research has been conducted to develop completion techniques involving gravel-packing inflow-control screens in horizontal wells.Based on studies related to technical principles and technical challenges in completion techniques involving gravel-packing inflow-control screens in horizontal wells,the advantages and drawbacks of screens of various types were reviewed.Subsequently,screens with choke nozzles or those with flowing channels were deployed.In consideration of requirements for completion involving grave-packing inflow-control screens in horizontal wells,polymer gravels with lower densities were used as packing gravels.Tests were conducted to assess the packing performances of gravels.Relevant results showed the gravel-packing layers could effectively eliminate horizontal flow of fluids in the borehole.Consequently,the layers might serve as packers.By highlighting gravel-packing techniques,completion techniques involving gravel-packing inflow-control screens in horizontal wells were developed.Field applications were performed in the horizontal Well A in the Tahe Oilfield.Compared with those before application,the the well productivity was enhanced by 411.8%,where as the water-cut was reduced by 13.5percent.Research results showed the completion techniques involving gravel-packing inflow-control screens in horizontal wells could effectively enhance the accuracy of the screen to stabilize oil production and to minimize the water cut.Such innovative technologies may be deployed more extensively to enhance production performances.
展开▼
