摘要
针对渤海油田测试井出砂,试井曲线出现径向复合特征,测试初期产能曲线难以准确校正,从直井不稳定渗流数学模型出发,分析径向复合情况下压力传播特点,推导出新的流动效率计算公式与地层压力分布解析式。以此为基础,得到径向复合情况下测试产能时间校正系数公式。校正后发现,在相同表皮系数下,流度比越大流动效率越低;流度比和内圈半径越大,对应的测试时间校正系数越低。实例应用结果表明,新公式计算得到的对应比采油指数与油田生产井投产后该层的平均比采油指数接近,更能准确校正测试出砂井的初期产能,可用于指导渤海油田相关油井产能评价。
The early productivity correction of test wells with sand production in Bohai Oilfield was challenged by the radial compound pattern which was showed in well test curve.Based on the mathematical model of unsteady flow in vertical well,a new flow efficiency calculation formula and an analytical formula for formation pressure distribution were derived by analyzing the pressure propagation under radial compound condition.And then,a time correction coefficient formula was obtained for well productivity testing under radial compound condition.The correction results show that the flow efficiency decreases with the increase of mobility ratio under equal skin factors.The testing time correction coefficient decreases with the increase of mobility ratio and inner radius.Field application shows a favorable agreement between the specific productivity index calculated by this new formula and the average specific productivity index of the oil wells after putting into production.This research can make the correction of the initial productivity of testing well with sand production more accurate,which could also provide certain guidance for the productivity evaluation of relevant wells in Bohai Oilfield.
作者
邓琪
张宏友
汪全林
陈晓祺
肖波
DENG Qi;ZHANG Hongyou;WANG Quanlin;CHEN Xiaoqi;XIAO Bo(Bohai Petroleum Research Institute,CNOOC(China)Tianjin Branch,Tianjin 300452,China)
出处
《油气井测试》
2019年第5期74-78,共5页
Well Testing
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”(2016ZX05058001)
关键词
测试
出砂
初期产能
表皮系数
时间校正系数
采油指数
产能评价
testing
sand production
early productivity
skin factor
time correction coefficient
oil productivity index
productivity evaluation
