水平井地质导向技术在港西底水稠油油藏中的推广应用

Application of horizontal well geosteering technology in heavy oil reservoir with bottom water in GX oilfield

针对国内一些老油田已处于开发中后期,受单井控制储量、底水、原油粘度等因素影响,常规井出现初期产量低、递减快、采收率低等问题,开展了水平井地质导向的适用性研究,其核心技术是运用“蛙泳法”计算地层动态倾角,以确保水平段“甜点”长度能够达到设计预期,进而提高储层钻遇率及底水稠油油藏动用程度。在优质储量区部署2口水平井,初期产量均在30 t/d以上,含水率低于10%,投产效果好,很大程度上提高了采收率,取得了良好的经济效益。

Due to some old oil fields have been in the middle and late stages of development,and the influence factors of single well control reserves,bottom water,crude oil viscosity and other factors,conventional wells have problems such as low initial production,rapid decline and low recovery.This paper has carried out the study on the applicability of horizontal well geosteering,and its core technology is to use the"breaststroke method"to calculate the dynamic dip angle of the formation to ensure that the"sweet spot"length of the horizontal section can meet the design expectation,and improve the drilling rate of the reservoir and the production degree of the heavy oil reservoir with bottom water.Two horizontal wells are deployed in high⁃quality reserves area,with initial production of more than 30 tons per day and water cut of less than 10%.The production effect is good,greatly improving the recovery factor and achieving good economic benefits.