裂缝碳酸盐岩油藏开发后期精细描述与挖潜技术

FINE DESCRIPTION AND POTENTIAL TAPPING TECHNOLOGY DURING LATE DEVELOPMENT STAGE OF FRACTURED CARBONATE ROCK RESERVOIR

任丘潜山油藏是我国最大的裂缝性碳酸盐岩块状底水低饱和油藏,经过30多年开采,已进入高含水后期低速缓慢递减阶段,搞清剩余油分布特点对后期挖潜与改善开发效果意义重大。本文在裂缝储层预测基础上,开展水锥间剩余油分布规律研究。运用新建地质模型,结合生产动态,开展单井和区块数值模拟研究,建立单井和多井双孔单渗模型,研究不同时期油水界面变化形态,研究水锥的演变过程和形成机理,确定现阶段油水界面和水锥形态,初步计算在裂缝系统油水界面以上剩余地质储量,进行水锥间剩余油富集区复杂水平井或其他有效动用途径的可行性研究,提出经济有效的挖潜方式。

Renqiu buried hill is the largest fractured and low-saturated carbonate rock reservoir with massive bottom water.After thirty years＇ development,the reserve has entered into the late stage,which declines slowly in high water cut.Therefore,it is a great significance to figure out the remaining oil distribution for the late potential tapping and improvement of development response.On the basis of fracture prediction,this paper studies the remaining oil distribution rule between the water cones.With the digital simulation research connected with the new geologic model and production performance,the double porosity model in single permeability has been built.Through the research on the changing of oil-water contact in different phases and the research on the evolution process and formation mechanism of water cones,the depth of oil-water contact and the shape of water cones at the present stage are defined.At the same time,the remaining geological reserve over oil-water contact in fracture system is basically calculated.Finally,with the feasibility study to exploit the remaining oil between the water cones by complex horizontal well and other effective methods,the economical and effective tapping modes are proposed.