摘要
为实现高含水油藏CO_(2)驱采收率最高、CO_(2)封存量最大的多重目的,考虑CO_(2)注入成本、驱油及封存收益等指标,建立基于经济净现值(NPV)的高含水油藏CO_(2)驱油与封存联合优化目标函数,结合油藏数值模拟方法,运用随机扰动近似梯度算法(SPSA)对优化目标函数进行迭代求解。以胜利油田某高含水油藏为例,根据不同时刻油藏含水率不同的特点,设置不同转注CO_(2)时机,分别开展注水和注CO_(2)方案优化,对比2种注入方式下生产动态及NPV差异,分析注CO_(2)时机对累积产油量及CO_(2)封存量的影响,并确定最优转注CO_(2)时机;此外,设置不同CO_(2)注入价格、封存补贴方案,分析其对经济效益的影响。研究结果显示,为使高含水油藏CO_(2)驱项目盈利,转注时含水率应低于0.97;当CO_(2)注入价格为1.2元/m^(3),封存补贴为0.114元/m3时,高含水油藏转注CO_(2)时机越早,收益越高。
In order to achieve the multiple purposes of the highest CO_(2)flooding recovery and the largest CO_(2)storage in high water cut reservoirs,an objective function of collaborative CO_(2)flooding and storage optimization for high water cut reservoirs based on economic net present value(NPV)was established by considering CO_(2)injection cost,CO_(2)flooding and storage benefits.Combined with the reservoir numerical simulation method,we used simultaneous perturbation stochastic approximation(SPSA)to solve the objective function iteratively.Taking a high water cut reservoir in Shengli Oilfield as an example,the different injection timings of water transferring to CO_(2)were set according to the different characteristics of water cut in the reservoir at different times.The optimization of water injection and CO_(2)injection schemes was carried out,respectively,and the differences in production behavoir and NPV under the two injection methods were compared.The influence of gas injection timing on cumulative oil production and CO_(2)storage was analyzed,and the optimal gas injection timing was determined.In addition,the effects of different gas injection prices and CO_(2)storage subsidy schemes on their economic benefits were analyzed.The results show that the water cut should be lower than 0.97 during waterf transferring CO_(2)injection to make the CO_(2)flooding project profitable in high water cut reservoirs.The high project profit can be guaranteed as CO_(2)is injected earlier when the CO_(2)injection price is 1.2 yuan/m^(3),and the carbon subsidy is 0.114 yuan/m^(3).
作者
刘佳
孟凡坤
徐云峰
温成粤
李玉佳
LIU Jia;MENG Fankun;XU Yunfeng;WEN Chengyue;LI Yujia(Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan City,Hubei Province,430100,China;School of Petroleum Engineering,Yangtze University,Wuhan City,Hubei Province,430100,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2024年第3期186-194,共9页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金青年基金项目“低渗透油藏CO_(2)驱气窜通道表征识别与调控优化方法研究”(52104018)
中国石油天然气股份有限公司“十四五”前瞻性基础性重大科技项目“大型碳酸盐岩气田控水提高采收率关键技术研究”(2021DJ1505)。
