海上油田丛式井网整体加密调整技术研究

Research on overall encryption adjustment technology of offshore oil field

以绥中36-1为代表的海上稠油油田已经进入开发中后期,逐步暴露出注采矛盾突出、层间和平面上储量动用差异大、单井控制储量过高、采油速度和采收率较低、综合含水上升快,产量递减快等问题,针对中国海油稠油开发面临的挑战,首次提出海上油田大规模综合调整研究,由于海上油田特殊的开发方式,陆地油田综合调整工作中成熟的研究思路和技术路线无法复制到海上油田,海上油田整体加密调整技术研究面临诸多技术难点,因此,本次研究结合绥中36-1油田I期自身特点和开发方式,针对油田开发存在的问题,创新性地提出一整套海上油田的整体挖潜和调整的技术思路和研究方法,完成绥中36-1油田I期整体加密调整方案,调整后油田井网由反九点面积注水井网转变成为行列注水井网,探索"定向井+水平井"开发模式,整体加密实施效果良好,油田水驱状况明显改善,水驱储量动用程度从调整前的80.5%提高到调整后的91.3%,采收率大幅度提高,预计提高采收率10.4%,整体加密调整技术必将在同类油田中推广应用。

Take SZ36-1 oilfield as an example,offshore fields of heavy oil have stepped into later stage in development life and revealed problems gradually for serious injection/production contradiction,big variation for producing reserves in interlayer and plane,much higher for well-controlled reserves,lower for both of oil production rate and oil recovery,changing fast for composite water cut rising and production decline.In view of the challenge for development of offshore fields of heavy oil in China,we put forward the study of comprehensive adjustment for offshore fields in large scale firstly.Because of the special development mode of offshore fields,the proven research thinking and technical route for comprehensive adjustment used by onshore oilfields could not be copied to offshore fields.The research technology of comprehensive adjustment for integral well pattern thickening faces many technical difficulties,so now this research makes a combination of self-characteristics and development mode of SZ36-1 oilfield to put forward a full suite of research thinking and research methods for integral potential tapping and adjustment,and completes the proposal of comprehensive adjustment for integral well pattern thickening in SZ36-1 oilfield phase I.A water injection well pattern of inverted nine spot is transformed into a well pattern of line drive after pattern adjustment to try a development modes of ＂direction well horizontal well network ＂.The implementation effect of integral well pattern thickening makes a good effect for greatly improved state of water flooding,improved from 80.5 % before adjustment to 91.3 % after adjustment for producing degree of water flooding,forecasting greatly improved recovery for 10.4 %.The technique of adjustment for integral well pattern thickening is sure to be popularized and applied among the similar oilfields.