单井效益评价在低渗透油田开发中的应用

Application of Single Well Benefit Evaluation for Low Permeability Oilfield

低油价条件下大庆长垣外围低渗透、低丰度和低产油田面临着更严峻的挑战,做精做准经济效益评价,为科学决策保驾护航十分必要。本文应用单井效益评价系统对榆树林油田所有生产油井和地质区块进行了投入产出计算,并根据成本与收入的大小关系,对已开发区块及单井进行了效益类别划分,对比了不同开发方式和不同储层油井和区块的效益情况。对榆树林油田首个扶杨三类加密区块树322进行了加密前后指标对比,并计算了加密油井盈亏平衡的临界油价。对水驱转二氧化碳驱试验区树16进行了增油评价,计算了增油销售收入,分析了吨油操作成本的变化。最后对19口缝网压裂井进行了效益评价分析,计算了考虑措施增油所增加的四项操作成本的投入产出比。

Daqing peripheral oilfield developing low permeability,low abundance and low production reservoir may face more severe challenges when oil price decreases.It is necessary for us to do economic evaluation accurately to guarantee scientific decision-making.In this paper,we calculate the input and output of all producing wells and blocks in 2016 by using single well benefit evaluation system,then benefit grades for these wells and blocks are divided.In addition,development and benefit indexes for different reservoirs and flooding methods are analyzed.Based on the input-output calculation,three major stimulation and adjustment methods for developing low permeability reservoir are evaluated.First,only when oil price is higher than 70 dollars can well pattern infilling for Shu 322 block make profit.Second,converting water flooding to carbon dioxide flooding for Shu 16 block turned out to be a quite successful decision because of obvious production increase and oil unit operation cost decrease.Finally,a overall and reasonable model for calculating the added input for stimulation measure is quoted to evaluate network fracturing.It is shown that network fracturing is a cost-effective method for low permeability oilfield.