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注水管理要求水力压裂布置最优化。在西西伯利亚的南Priobskoe油田,由于缺少直接的应力测量(垂直分布和方向)而需要确定最小主应力的方向与大小。砂岩产层之间不渗透泥岩的存在,使得为了最大化采收率而进行压裂的设计和油田的开发变得复杂。渗透率和渗透率各向异性在不同的深度是个未知量,这将影响油井的完成和油藏管理的决策。对若干砂岩和泥岩储层的微裂缝进行了地层评价(应力测试)。在应力测试中通过电缆地层测试器的双封隔器模块来隔离1m的储层,然后用井下泵注入钻井液来造一个水力裂缝。电缆双封隔器和标准探测器模块的组合可提供多个有关砂岩中渗透率和渗透率各向异性的评估。应力测试前后利用储层缩微图像数据来获取有关最小主应力方向的信息。由于西西伯利亚工作环境恶劣,造成从事详细的风险评估、工作计划、实时质量管理与决策的困难。对优化井数、井网、注水井选择和压裂设计中所获得的应力和渗透率数据进行了讨论。
Waterflood management requires hydraulic fracturing layout optimization. In the southern Priobskoe field in western Siberia, the direction and magnitude of the minimum principal stress needs to be determined due to the lack of direct stress measurements (vertical distribution and direction). The presence of impermeable mudstones between sandstone pay zones complicates the design of fracturing and the development of the field to maximize oil recovery. Permeability and permeability anisotropy are unknown at different depths, which will affect well completion and reservoir management decisions. Stratigraphic evaluation (stress test) of a number of micro-fractures in sandstone and mudstone reservoirs. A 1m reservoir was isolated by a cable packer’s dual packer module during the stress test and then a drilling fluid was injected into the downhole pump to create a hydraulic fracture. The combination of a cable double packer and a standard detector module provides several assessments of permeability and permeability anisotropy in sandstone. Before and after stress testing reservoir microforie data were used to obtain information about the direction of the minimum principal stress. Due to poor working conditions in West Siberia, it poses difficulties in conducting detailed risk assessments, work plans, real-time quality management and decision-making. Stress and permeability data obtained in optimizing well numbers, well patterns, injection well selection, and fracturing design are discussed.