气驱开发油藏井网密度数学模型

摘要

Optimal well spacing in gas flooding reservoirs has been studied based on gas flooding recovery factor computation method which is postulated for the first time. Relationship between total net present value during appraisal period and well spacing is studied by employing technical economic analysis. Mathematical models of economic optimal well spacing and economic limit well spacing in gas flooding reservoirs have been first presented by using Stagnation point method for extremum, which incorporate oil and associated gas production, commodity rate of oil, recycled ratio of produced gas, composition of recycled gas, sales tax, resources tax, special oil gain levy, repayment period of fixed assets investment, loan rate of fixed assets investment, discount rate, and other parameters. Practical application indicates that well spacing models above are reliable.%井网密度对气驱开发效果有决定性影响.首次提出了考虑当前采出程度和混相程度的气驱采收率计算公式.以气驱采收率计算为基础,从技术经济学观点考察了注气项目在评价期内的投入产出情况.建立了气驱井网密度与净现值之间联系.利用驻点法求极值方法得到了气驱开发油藏的经济最优井网密度和经济极限井网密度的数学模型.研究成果对于注气潜力评价和油藏注气开发实践有重要指导意义.