摘要
鉴于现有CO2驱油藏筛选标准缺乏体现未来生产效果的技术经济指标,向现有筛选标准中增补能够反映CO2驱经济效益的指标(单井产量相关指标),进而提出适合CO2驱的低渗透油藏筛选新方法。基于气驱增产倍数概念得出低渗透油藏气驱见效高峰期单井产量油藏工程预测方法,根据技术经济学原理得到反映CO2驱项目整个评价期盈亏平衡情况的经济极限单井产量确定方法,在此基础上提出了CO2驱低渗透油藏筛选新指标:若油藏工程方法预测气驱见效高峰期单井产量高于气驱经济极限单井产量,则目标油藏适合注气。进一步提出了气驱油藏4步筛查法:技术性筛选→经济性筛选→可行性精细评价→最优注气区块推荐。利用新方法重新评价了某油田17个区块CO2驱潜力,得到适合CO2驱的地质储量仅为传统方法的32.4%。建议按照新方法选择注气区块,确保项目的经济效益。
Since the existing gas flooding reservoir screening criteria lack economic indexes reflecting future dynamic production performances, indexes reflecting economic profits are added into the exiting criteria （related single well production indexes） to form a new method of selecting low permeability reservoirs suitable for CO2 flooding. Reservoir engineering methods of single well peak oil production rate （OPR） prediction for gas drive tight reservoirs is given by employing the concept of ＂OPR multiplier due to gas flooding＂ Based on the technical economics principles, the method calculating the economical limit OPR of CO2 flooding is also presented. On this basis, a new screening criterion of reservoirs suitable for CO2 flooding is proposed： if the peak OPR predicted by reservoir engineering method is higher than the economic limit OPR, the target reservoir is suitable for CO2 flooding. Furthermore, a four-step reservoirs screening method is advanced： technical screening, economic screening, feasibility evaluation, recommendation of optimal gas flooding blocks. The new screening criteria were applied to evaluate the CO2 flooding potential of seventeen blocks in an oilfield, which ended up with only 32.4% of the geologic reserves from conventional method suitable for CO2 flooding. It is recommended blocks suitable for CO2 flooding be selected according to the new criterion to ensure economic success.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第3期358-363,共6页
Petroleum Exploration and Development
基金
国家科技重大专项"CO2驱油与埋存关键技术"(2011ZX05016)
中国石油天然气股份有限公司专项"长庆油田低渗透油藏CO2驱油与埋存关键技术研究与应用"(2014E3606)
关键词
CO2驱
低渗透油藏
筛选标准
气驱增产倍数
油藏工程方法
经济极限单井产量
CO2 flooding
low permeability reservoir
screening criterion
oil production rate multiplier due to gas flooding
reservoir engineering method
single well economic limit oil production rate
