特低渗透油藏考虑变启动压力梯度的产量计算模型  

Production calculation model of ultra-low permeability reservoir considering variable start-up pressure gradient

作　　者：董郝 李承龙[2,3] DONG Hao;LI Chenglong(No.6 Oil Production Plant of Daqing Oilfield Co.Ltd.,PetroChina,Daqing 163114,China;Exploration and Development Research Institute of Daqing Oilfield Co.Ltd.,PetroChina,Daqing 163712 China;Heilongjiang Provincial Key Laboratory of Reservoir Physics&Fluid Mechanics,Daqing 163712,China)

机构地区：[1]中国石油大庆油田有限责任公司第六采油厂,黑龙江大庆163114 [2]中国石油大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]黑龙江省油层物理与渗流力学重点实验室,黑龙江大庆163712

出　　处：《复杂油气藏》2021年第3期77-80,共4页Complex Hydrocarbon Reservoirs

基　　金：国家科技重大专项“外围油田改善开发效果及提高采收率技术研究与应用”(2016E-0209)。

摘　　要：特低渗透油藏流体呈非线性流动,受压敏效应作用,渗透率发生变化,从而导致启动压力梯度变化。目前已有的产量计算方法未同时考虑变启动压力梯度和压敏效应的问题,计算结果与实际情况偏差较大,适用性较差。针对这些问题,基于特低渗透油藏渗流理论,利用压敏效应公式等,建立了变启动压力梯度的产量计算模型,并以朝阳沟油田C区块为例,分析了压敏效应和变启动压力梯度对产量的影响。结果表明,利用所建模型计算C区块累计产量,计算精度提高了4.17%,其中27口采油井产量计算误差小于5%,模型计算结果更符合矿场实际情况。研究成果完善了特低渗透油藏渗流理论,可为特低渗透油藏的有效动用提供理论基础。The fluid flow in ultra-low permeability reservoir is nonlinear,and the permeability changes due to the pressure sensitive effect,which causes the start-up pressure gradient to change.At present,the existing production calculation methods do not take into account the problems of variable starting pressure gradient and pressure-sensitive effect at the same time,so the calculation results deviate greatly from the actual situation,and the applicability is poor.In terms of these problems,based on the percolation theory of ultra-low permeability reservoirs,a production calculation model with variable starting pressure gradient was established by using the pressure-sensitive effect formula.Taken Block C of Chaoyanggou Oilfield as an example,the influence of pressure-sensitive effect and variable starting pressure gradient on production was analyzed.The results show that the accuracy of the model has increased by 4.17%,and the calculation error of the production of 27 oil wells is less than 5%.And the calculation result of the model is more in line with the actual situation.The research results have perfected the percolation theory of ultra-low permeability reservoirs and can provide a theoretical basis for the effective production of ultra-low permeability reservoirs.

关 键 词：特低渗透油藏 变启动压力梯度 压敏效应 朝阳沟油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]