摘要
河50断块丛式井组为全国最大的陆基平台井组,1989年投入开发,共有油水井45口,其中斜井43口,最大井斜角在19°～63°之间,现已进入高含水期,产能建设亟需进行调整开发。该断块探明含油面积2.6km2,地质储量1052×104t,可采储量242×104t,呈扇状分布,属稀油低渗、低饱和高压岩性构造油藏,具有天然能量充足、产量递减快的特点。由于老区采油地层压力亏空,调整井钻井过程中易出现井漏、井涌、坍塌等复杂情况,加之老区井网密集、斜井众多,井身轨迹控制困难,防碰难度大,对钻井技术、油气层保护和固井质量提出了更高的要求。对此,制定了井身轨迹控制与防碰技术措施;优选了适宜不同地层的钻井液体系;形成了井壁稳定与承压堵漏技术、固井技术和油气层保护技术。实钻效果表明:河50丛式井组调整井钻井技术有效解决了该区块井漏、井塌、缩径及固井时水泥浆漏失等井下复杂情况,井身质量和固井质量合格率均为100%。
The muhiwell cluster of fault block He50 is the biggest one on landbased platform.There has been 45 oil and water wells since putting into production in 1989.Among them,there has been 43 inclined wells with 19°to 63°of maximum angle of inclination.The block has entered high water cut period,and production pattern should be adjusted immediately.It is the lithostructural thin oil reservoir with low permeability,low oil saturation and high pressure,distributed as a fan.It has the features of enough natural energy and rapid pro- duction decline with 2.6km2 of proven oil-bearing area,1052×104t of OOIP and 242×104t of recoverable reserves.In mature oilfields,some complex situations of circulation loss,well kick,and borehole collapse and so on easily happened during the drilling process of the adjustment wells for inefficient formation pressure for oil production.Well technology, reservoir pattern was dense and the inclined wells were more in the mature oilfields,so drilling protection and cement job quality must be enhanced. The measures of wellbore trajectory control and collision protection were mized.The technologies formed.Actual drilling the complex problems taken.Drilling fluid systems suitable for different formations were optimized.The technologies of hole stability and sealing by formed.Actual drilling results show the complex problems of circulation rate of wellbore quality and cement pressurization ,cementing and reservoir protection were that：adjustment wells in multiwall loss,borehole collapse and mud job quality were both 100%. cluster HeS0 were applied in solving loss when reducing and cementing,and
出处
《中外能源》
CAS
2010年第2期47-51,共5页
Sino-Global Energy
关键词
河50断块
丛式井组
调整井
钻井
fault block He50
multiwell cluster
adjustment well
oil drilling
