一种基于流管法的低渗透油藏产能预测方法  

Productivity prediction in low permeability reservoir based on flow tube method

作　　者：安然 冯松林 钟珣 李凯凯 董传宾 AN Ran;FENG Songlin;ZHONG Xun;LI Kaikai;DONG Chuanbin(Oil Production Plant 6 of PetroChina Changqing Oilfield Company,Xi'an Shaanxi 710000,China;Yangtze University,Wuhan Hubei 430100,China)

机构地区：[1]中国石油长庆油田分公司第六采油厂,陕西西安710000 [2]长江大学,湖北武汉430100

出　　处：《石油化工应用》2022年第8期76-79,共4页Petrochemical Industry Application

摘　　要：对于低渗透油藏,储层流体流动具有典型的非线性渗流特征,考虑油藏启动压力梯度,运用流线积分法和计算单元分析法,推导出低渗透油藏五点法井网开发条件下油水两相渗流时的产能计算公式。根据时间离散原理,结合井网几何参数等给出了单井产能随时间变化的预测方法。分析了油水两相产能的主要影响因素,结果表明,定注采压差生产时,随着地层平均含水饱和度的增大,单井产油量减小,产水和产液量增大。与传统的只考虑单相渗流的低渗透油藏产能计算方法相比,该方法更符合油藏开发中后期的实际,可以为油藏开发后期井网调整提供思路。Non-linear seepage flow is one of the typical flow characteristics in low permeability reservoirs.Based on the study of the starting pressure gradient,a formula of calculating the oil-water two phase productivity of five-spot well pattern is derived which using the flow line integral method and computational unit analysis.According to time-discrete principles,combined with the geometric parameters of well patterns,the oil well productivity prediction methods change over time are presented.The main factors affecting oil-water two-phase production capacity are analyzed,the results show that when the injection and production pressure difference is given,with the increase of average formation water saturation,the well production of oil decreases,while the production of water and fluid increase.Compared with conventional methods which only considering single phase flow in low permeability reservoir productivity calculation,the method given in this paper is more in line with the late stage of actual reservoir development,it can also provide directions for well pattern adjustment in the later stage of reservoir development.

关 键 词：启动压力梯度 流线积分法 面积井网 产能预测公式 

分 类 号：TE312[石油与天然气工程—油气田开发工程]