基于压力波通信的注水井分层调控系统研究

Study on Separate Allocation System for Water Injection Well Based on Pressure Wave Communication

我国多数油田进入中高含水期,层间吸水差异变大,导致水驱动用程度低、层间和层内矛盾突出、自然递减大,整体开发效果差。而水驱中常规分层存在注水测试调配过程复杂、机械对接方式风险大、配套成本高和分注合格率下降快等问题,为此研究了基于压力波通信的注水井分层流量调配技术。通过建立基于压力波通信的注水井分层调配系统,以及采用集成化、小型化配水器在井下进行分层流量测调与数据录取,并提出压力波通信原理与算法,实现了分层注水的数字化监控,该技术在华庆油田应用150口井。技术应用表明,试验区分注合格率保持在95%以上,自然递减降低2.2%,含水上升率降低2.5%,5年累计增油3.7万t,开发效果持续提升。表明基于压力波通信的注水井分层流量调配技术,实现了地面与井下远程双向无线通信和井下分层流量自动调节、注水动态参数实时监测提取与远程传输。该技术为及时掌握超低渗透油藏分层测调与管理起着重要的支持作用。

With most oilfields in China entering the stage of medium to high water cut,the difference of water absorption between layers becomes larger,which leads to low degree of water drive,prominent contradictions between layers and inner layers,large natural decline,and poor development result.In conventional separate water injection,there are some problems such as complicated water injection testing and allocation process,high risk of mechanical docking,high supporting cost and rapid decrease of qualified rate of separate injection.Therefore,the separate flow allocation technology of water injection wells based on pressure wave communication was studied.The separate allocation system of water injection wells based on pressure wave communication was established.Integrated and compact water injection allocators were used to realize separate flow regulation and data acquisition downhole.Moreover,the principle and algorithm of pressure wave communication were presented,which realized the digital monitoring of separate water injection.This technology has been applied to 150 wells in Huaqing Oilfield.The applications showed that the qualified rate of separate injection was above 95%,the natural decline reduced by 2.2%,and the water cut rising rate reduced by 2.5%.The cumulative oil production in four years increased by 37000 tons,and the development effect has been improved continuously.It also shows that the technology based on pressure wave communication realize the remote two-way wireless communication between surface and downhole,automatic regulation of downhole stratified flow,real-time monitoring and extraction of dynamic parameters for water injection and remote transmission.The technology plays an important role in supporting the management of ultra-low permeability reservoir stratification.