气顶边水油藏水平井垂向位置优化研究  

Longitudinal Position Optimization of Horizontal-Wells in the Gas-Cap Oil Reservoir with Edge-Aquifer

作　　者：房娜 刘宗宾 祝晓林 王欣然 宫平志 Fang Na;Liu Zongbin;Zhu Xiaolin;Wang Xinran;Gong Pingzhi(CNOOC(China)Tianjin Branch,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司

出　　处：《特种油气藏》2019年第4期91-96,共6页Special Oil & Gas Reservoirs

基　　金：“十三五”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”(2016ZX05058—001)

摘　　要：针对气顶边水油藏油气水三相共存,流体界面运移规律复杂,水平井垂向位置难以确定的问题,以渤海锦州A油田为例,基于油藏工程法建立了不同气顶指数和水体倍数下流体界面移动模型,总结了油气界面和油水界面移动规律。在此基础上,绘制不同开发阶段水平井合理垂向位置图版,并结合数值模拟、矿场实践验证了该方法的有效性。结果表明:水平井合理的垂向位置主要受气顶、边水能量和地层压力的影响;在不同的开发阶段部署调整井时,应考虑油气界面和油水界面运移速度的差异,不断优化水平井垂向位置,避免油井过早气窜、水锥。该方法有效指导了锦州A油田二期加密需求,预计可提高采收率6.8个百分点。该研究可为气顶边水油藏水平井的部署提供一定的借鉴。The A oilfield in Jinzhou of Bohai was taken to study the deployment of horizontal-well longitudinal position due to the complex fluid interface migration pattern in the gas-cap oil reservoir with edge-aquifer results from the oil-gas-water three-phase co-existence.A fluid interface migration model with under various gas-cap indexes and aquifer volume ratios was established according to the reservoir engineering method.The corresponding reasonable longitudinal horizontal-well position plate was prepared in different waterflooding development stages.This study was verified by numerical simulation and field practice.Result indicates that the reasonable longitudinal horizontal-well position is mainly dependent on the gas-cap,edge-aquifer energy and formation pressure.During the development deployment adjustment,the migration speed difference in the oil-gas and oil-water interfaces should be taken into consideration to continuously optimize the longitudinal horizontal-well position and prevent well from early gas breakthrough and water coning.This method provides an effective guidance for the second well infilling of A oilfield in Jinzhou.It is expected to enhance the recovery factor of 6.8 percentage points.It can also supply certain reference for the horizontal-well deployment in the gas-cap oil reservoir with edge-aquifer.

关 键 词：气顶 边水 水平井 垂向位置 油气界面 油水界面 窄油环 渤海油田 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程]