摘要
已有特低渗透油藏开发效果评价方法体系中未考虑流体渗流特征、流体性质、经济效益等因素,不适用于特低渗透油藏开发效果的评价,且权重计算方法过于单一,导致权重值不合理,评判结果不准确。针对这些问题,考虑特低渗透油藏条件和渗流特征,结合开发技术政策及经济效益等因素,引入启动压力梯度、压敏效应、原油黏度、吨油操作成本等指标,建立九大系统,共46个指标,形成了特低渗透油藏开发效果评价体系,利用隶属度区间分布计算方法和主客观组合赋权法,建立了特低渗透油藏开发效果综合评价模型。评价结果表明,2016年A区块综合评价结果为“中”,结合评价结果,实施补孔、转注、压裂、改善管理方式、优化投入等措施,截至2018年底,区块可采储量采油速度由1.27%上升至1.35%,压力保持水平由62%上升至68%,水驱控制程度由58.6%上升至79.7%,投入产出比由1.00∶1.17提高至1.00∶1.21。该研究成果可为大庆长垣外围特低渗透油藏开发规划提供技术支持。
The fluid flow mechanism,fluid properties,economic benefit and other factors have not been taken into consideration in the available evaluation system for the ultra-low permeability oil reservoir development performance,which is limited in the development performance evaluation of ultra-low permeability oil reservoir.In addition,the weighting calculation method is too singular to gain reasonable weight value,which usually leads to inaccurate evaluation.Based on the ultra-low permeability oil reservoir conditions and fluid flow mechanism,the starting pressure-gradient,pressure sensitivity,viscosity,operating costs of unit ton oil and other indexes were introduced by combining with technical development policies and economic benefits.A comprehensive evaluation system for the ultra-low permeability oil reservoir development performance was established with 9 series and 46 indexes.Comprehensive evaluation indicates that Block A is“Medium”level,which recommends re-perforation,well conversion,fracturing,management improvement,input optimization,etc.By the end of 2018,the block recovery rate of recoverable reserve increases from 1.27%to 1.35%,the formation pressure maintenance level increases from 62%to 68%,the waterflooding producing level increases from 58.6%to 79.7%,and the input-output ratio increases from 1.00∶1.17 to 1.00∶1.21.This research could provide certain technical basis for the development planning of peripheral ultra-low permeability oil reservoirs in Changyuan.
作者
李承龙
苗志国
李照永
张宇
Li Chenglong;Miao Zhiguo;Li Zhaoyong;Zhang Yu(Institute of Exploration and Development of PetroChina Daqing Oilfield Limited Company,Daqing,Heilongjiang 163712,China;Daqing Normal University,Daqing,Heilongjiang 163712,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2019年第4期97-102,共6页
Special Oil & Gas 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)、“低渗、特低渗复杂油藏规模有效动用关键技术”(2017ZX05013-006)
关键词
特低渗透油藏
开发效果
综合评价
隶属度区间函数
主客观组合赋权法
大庆长垣外围
ultra-low permeability oil reservoir
development performance
comprehensive evaluation
member degree interval function
subjective-objective combination weighting method
Out-ring of Changyuan in Daqing Oilfield
