低渗透油藏不稳定产量递减分析  

Analysis of instable production decline for low permeability reservoir

作　　者：赵宏军[1] 廖新维[1,2] 王绍平 左冰心[4] 

机构地区：[1]中国石油大学(北京)石油天然气工程学院,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [3]中国石油长庆油田分公司采油二厂,甘肃庆阳745100 [4]中国石化吐哈油田公司鄯善采油厂,新疆鄯善838202

出　　处：《油气地质与采收率》2011年第2期87-89,116-117,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家基础研究项目"CO2的地质埋存及提高原油采收率(GCSEOR)"(2006CB705801);新世纪优秀人才计划(2007)

摘　　要：以不稳定渗流理论为基础,结合低渗透油藏非线性渗流特征,基于前人研究建立了考虑启动压力梯度的低渗透油藏垂直井在定井底流压下的产量数学模型。应用Laplace变换及Stehfest数值反演算法,编程并绘制出产量预测理论图版。对影响产量的无因次启动压力梯度和表皮系数进行了敏感性分析。结果表明,表皮系数对初期产量的影响较大,启动压力梯度主要影响后期产量,并且,随着表皮系数的增大,初期产量随之下降;随着启动压力梯度的增加,后期产量递减时间缩短,下降幅度变大。图版与生产数据拟合,以评价油井的措施效果。对油井产量递减进行有效分析,并提出了减缓产量递减的开发技术政策,为产量的科学预测及开发政策的制定提供了依据。Based on the theory of instability seepage, combining with non-linear flow characteristics of low permeability reservoir,and taking into account of threshold pressure gradient as well as the previous research results, the production mathematical model based on the vertical wells under the conditions of the constant flow pressure is established herein. The production forecast is mapped out by Laplace transform and Stehfest numerical inversion algorithms. The effects of the dimensionless start-up pressure gradient and the skin factor on the oil production are analyzed. The results show that the skin factor yields considerable effect on initial production, but the start-up pressure gradient affects post-production primarily. Moreover, with the skin factor increases, the initial production falls; as the starting pressure gradient increases, post-production decline time becomes shorter with an apparent decline. Finally, the plates are matched with production data to determine the reservoir parameters and evaluate the effectiveness of well treatments. Integrating theory with practice effectively on well production decline analysis, we propose the relevant technical policies to reduce the production decline. The research provides a strong basis for the scientific production forecasting and the formulation of development policy.

关 键 词：低渗透油藏 非线性渗流 启动压力梯度 理论图版 动态分析 

分 类 号：TE348[石油与天然气工程—油气田开发工程]