海上低渗油田剩余油挖潜技术研究与实践

Research and Practice on Tapping Potential of Remaining Oil in Offshore Low Permeability Oilfields

本文针对南海东部LFQ油田低渗储层开发后期面临低产能、低采出、高含水的开发难题,在油藏精细描述的基础上,利用数值模拟技术开展剩余油分布研究,结合海上油田开发特点,提出相适应的剩余油挖潜技术对策。研究结果表明:由于LFQ油田处于开发后期,井网相对完善,剩余油具有规模小、分布散等特点,利用调整井技术挖潜可进一步提高采收率,但经济效益偏低;而MRC储层改造技术充分利用现有生产井段,增大泄油面积,提高油井产能与油藏采收率,具有低成本、高收益等优势。因此,对于此类处于开发后期的海上低渗油田,推荐采用MRC储层改造技术开展剩余油挖潜。

Aiming at the problems of low production capacity, low production and high water cut in the late development of low permeability reservoir in the LFQ oilfield in the east of the south China sea, this paper studied the distribution of remaining oil by using numerical simulation technology on the basis of fine description of the reservoir, and put forward appropriate technical countermeasures for exploiting the potential of remaining oil based on the characteristics of offshore oilfield development. The results show that: because the LFQ oilfield is in the later stage of development, the well pattern is relatively perfect, and the remaining oil has the characteristics of small scale and scattered distribution, the recovery rate can be further improved by using the adjustment well technology, but the economic benefit is low. However, Maximum Reservoir Contact (MRC) technology makes full use of the existing production well sections, increases the drainage area, improves the well productivity and reservoir recovery, and has the advantages of low cost and high profit. Therefore, for such offshore low-permeability oil fields in the later stage of development, it is recommended to use MRC reservoir reconstruction technology to carry out residual oil exploration.