Abstract: It is necessary to combine business conceptions with technological application for development of offshore low-grade oil reservoirs. Taking Nanpu 35-2 Oilfield for instance, the profit-loss balance curve analysis method is used to analyze economic performance of offshore heavy oil thermal production. Based on the results from the first round of thermal production in the testing zone of Nanpu 35-2 Oilfield, the production of most wells are only close to the profit-loss balance curve of economic development (IRR=12%, NPV=0), when the investment for platform engineering and drilling of modular rig are taken into account. On the condition that the investment for platform engineering is not taken into account, the output of all thermal production wells is above the profit-loss balance curve for economically-effective development following the first round of thermal recovery. If the oilfield has some advantageous conditions and the follow-up thermal production wells no longer share the engineering investment, the existing technology can meet the demand for economic development. The profit-loss balance curve method is recommended for reference. Namely, the stimulation operation can be used to keep economic performance of thermal production wells when the output of producing wells is below the profit-loss balance curve. Key words:

Key words: offshore, heavy oil field, thermal production, economic performance, profit-loss balance curve, systematic analysis

摘要： 开采海上低品位油藏需经营理念与技术应用有机结合,以南堡35-2油田为例,应用盈亏平衡曲线分析法对海上稠油热采经济效益进行了系统分析。结果表明,海上油田在考虑平台工程投资、按模块钻机实施钻井的条件下,从南堡35-2油田热采试验区第一轮次热采增产效果来看,大多数井的产量只是接近了经济开发的盈亏平衡曲线(IRR=12%,NPV=0);在不考虑平台工程投资的情况下,第一轮作业后全部热采井产量均在经济有效开发的盈亏平衡曲线之上;如果在油田具备"以优带劣"开发的条件,后续的热采井不承担工程投资分摊,现有技术可以满足经济开发要求;推荐参考盈亏平衡曲线方法,对热采井增产轮次作出科学安排,即在油井产量低于盈亏平衡曲线后,可以考虑实施增产作业,以保持热采井的经济性。

关键词: 海上, 稠油油田, 热力开采, 经济效益, 盈亏平衡法