低渗孔隙型碳酸盐岩稠油油藏开发对策——以叙利亚O油田为例

Development strategies for low-permeability carbonate heavy oil reservoirs: A case study from O oilfield in Syria

叙利亚O油田SH_B油藏为典型的低渗孔隙型块状碳酸盐岩稠油油藏,因"低渗、油稠"等突出特点,在现行的井网和开采方式下油藏开发效果差,主要表现为"三低",即储量动用程度低、单井产量低和油藏采收率低,尚无一套经济有效、可实施的开发方案。目前,低渗稠油油藏开发在国内外没有成功案例,也没有成熟技术及经验可借鉴,如何经济有效开发属世界级难题。为此,以"提高开发效益,实现有效开发"为目标,针对低渗稠油油藏面临的"三低"问题,应用油藏工程方法、数值模拟和经济评价技术,系统开展了开发方式、井型井网井距、水平段长度及水平井热采参数等优化研究,形成了低渗碳酸盐岩稠油油藏开发对策研究方法,针对性地提出了SH_B油藏的开发对策。优化确定的油藏开发技术对策为开发方案编制奠定了基础,也为国内外类似油藏开发提供了借鉴。

Reservoir SH_B of O oilfield in Syria is atypical porous carbonate heavy oil reservoir with low-permeability. It strikingly features in low permeability and high viscosity .Under the present well patterns and development models ,the development effect here is poor and it is manifested by three-low parameters：low ratio of produced reserves to proved reserves ,low single well production and low recovery .No cost-effective and enforceable development plan has been pro-posed.Presently,there is no successful case on low-permeability heavy oil reservoir development and no mature technolo-gy and experience for reference .The development of this kind of reservoir is still a world-class challenge .In order to im-prove development benefits and realize effective development ,reservoir engineering theories and methodologies ,numerical simulation and economic evaluation techniques are used to study and optimize systematically the development models , well types,well patterns,well spacing,lateral length,and thermal recovery parameters of horizontal well .Research me-thods for developing carbonate heavy oil reservoir are suggested ,and development strategy specifically for reservoir SH_B is proposed .The optimized development technical policy lays a foundation for development planning and provides a refe -rence for domestic and foreign analogous reservoirs .