海上中深层潜山油气藏高效开发策略与应用

Efficient development strategy and application of offshore medium-deep buried hill reservoirs

随着渤海地区渤中19-6油田千亿立方米级潜山凝析气藏的成功发现,渤海地区中深层潜山油田的开发引起了越来越多的关注。BZ油田是渤海地区最早投入开发的油田之一,也是我国首批对外合作开发的油田。该油田属于古生界碳酸岩潜山油田,埋藏深,地震资料分辨率低,储集空间为裂缝和基质双重介质,油气水关系复杂,属于中深层复杂油气藏,开发过程中面临诸多挑战。通过对该油田30年开发历程中开发策略及开发经验进行系统的思考回顾,总结了指导BZ油田高效开发的技术策略:(1)油气同采,均衡开发,保持油气界面稳定,合理挖掘油田潜力;(2)少井稳产、控制含水上升,不片面追求高采油速度,确保油田长期稳定生产;(3)滚动开发调整,逐层上返开发,保证产量接替。高效开发策略及技术的实施实现了BZ油田16年稳定生产,高峰年产气量3.2×108m3,为渤西南地区联网平稳供气奠定了基础,对其他海上类似中深层复杂油气藏的开发具有一定的指导和借鉴作用。

With the successful discovery of 100 billion square buried hill condensate gas reservoirs in Bozhong 19-6 oilfield,the development of medium-deep buried hill oilfields in Bohai area has attracted more and more attention.BZ oilfield is one of the earliest oilfields put into development in the Bohai Sea area,and also the first oilfields developed by foreign cooperation in China.The oilfield belongs to the Paleozoic buried hill oilfield,with deep burial,low resolution of seismic data,and its reservoir space is a dual medium of fracture and matrix.The oil-gas-water relationship is complex,and it belongs to the middle-deep complex oil and gas reservoir,which faces many challenges in the development process.Through a systematic review of the development strategy and experience of the oilfield in the past 30 years,the technical strategies guiding the efficient development of BZ oilfield are summarized as follows.(1)Oil and gas co-production,balanced development,maintaining stable oil and gas interface,reasonably tapping the potential of the oilfield.(2)Steady production of fewer wells,control of water cut rise,and not one-sided pursuit high oil production rate to ensure long-term stable production of the oilfield.(3)Progressive exploration and development,comprehensive adjustment,layer by layer upward to produce gas,to ensure production replacement.The implementation of efficient development strategy and technology has maintained stable production for 16 years in BZ oilfield,with a peak annual gas production of 320 million square meters,which has laid a foundation for stable gas supply through network in Southwest Bohai,and has a certain guidance and reference for the development of other offshore similar deep and medium-seated complex reservoirs.