渤海Q油田底水油藏有效注水及加密调整  

Effective water injection and infill adjustment in bottom water reservoir of the Q Oilfield in the Bohai Sea

作　　者：章威 李功 王美楠 张运来 阳晓燕 ZHANGWei;LI Gong;WANG Meinan;ZHANG Yunlai;YANG Xiaoyan(Tianjin Branch of CNOOC(China)Limited,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《复杂油气藏》2024年第4期449-454,共6页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”(2016ZX05058001)。

摘　　要：渤海Q油田属于典型的河流相沉积,底水油藏占该油田储量的40%左右,目前综合含水94%,处于特高含水阶段。开发过程中面临储层结构复杂、注水效果差、挖潜难度大等难题,急需开展特高含水期底水油藏精细注水及调整挖潜技术研究。针对以A区为代表的夹层发育底水油藏,基于储层结构精细解剖,利用油藏工程和数值模拟相结合的方法,纵向上注水井依托夹层实施层内分段注水,有效解决了底水油藏注水难题。针对以B区为代表的无夹层刚性底水油藏,利用高精度油藏数值模型,研究了水驱波及体积变化规律,形成了水平井井间波及系数图版,提出了水平井布井界限参数。研究成果应用于渤海Q油田底水油藏后,实现了底水油藏连续稳产6 a,A区自然递减率由35%下降至18%,B区主力砂体采收率提高了5个百分点,开发效果显著提升,为类似底水油藏特高含水期开发提供借鉴。The Q Oilfield in the Bohai Sea is characterized by typical fluvial sedimentation,with bottom water reservoirs accounting for about 40%of the oilfield′s reserves.Currently,the comprehensive water cut is 94%,indicating that it is in the stage of extra-high water cut.During the development process,the oilfield faces challenges such as complex reservoir structures,poor water injection effects,and significant difficulties in tapping potential.Therefore,it is urgent to conduct research on fine water injection and adjustment tapping technology for bottom water reservoirs during the extra-high water cut period.For the interlayer-developed bottom water reservoir represented by Zone A,based on a detailed dissection of the reservoir structure and utilizing a combination of reservoir engineering and numerical simulation methods,staged water injection within the layer was implemented to vertical water injection wells relying on the interlayer,effectively addressing the issue of effective water injection in bottom water reservoirs.For the rigid bottom water reservoir without interlayers represented by Zone B,a high-precision reservoir numerical model was used to study the variation of sweep volume during water drive,resulting in the formation of a sweep coefficient chart between horizontal wells and the proposal of layout boundary parameters for horizontal wells.After applying the research results to the bottom water reservoirs of the Q Oilfield in the Bohai Sea,continuous stable production was achieved for six years.The natural decline rate in Zone A decreased from 35%to 18%,and the recovery rate of the main sand body in Zone B increased by 5 percentage points,significantly improving the development effect and providing a reference for the development of similar bottom water reservoirs in the stage of extra high water cut.

关 键 词：底水油藏 特高含水期 精细注水 调整挖潜 波及系数 

分 类 号：TE341[石油与天然气工程—油气田开发工程]