摘要
液体与气体的物态差别显示:采收率方面,页岩气藏中非常成功的"广密压裂"(即所谓"体积压裂")不适用于致密油藏。采用广密压裂开发致密油藏实为"远采近甩",而且更为严重的是甩掉后极难收回。业内科研工作者尚未意识到水力碎裂区的原油会被囚禁这一严重不利,仅从能大幅度提高单井产能方面便公认广密压裂为开发致密油藏的有效手段,会对我国致密油藏即将来临的大规模开发造成错误指导。建议探寻不以降低采收率为代价的提高单井产能的开发手段。
Compared with natural gas flowing in porous media,oil flowing in porous media does not have pressure difference resulted from volumetric expansion between interior and surfaces of rubble.Meanwhile numerical value of pressure difference is very small between upstream ‘stagnation point'and downstream ‘stagnation point'produced by oil or gas flowing around rubble.Thus oil flowing in pores of rubble nearly stop because of extremely small pressure gradient.Similar analysis shows that oil can hardly flow in pores in most space of narrow peninsula-like parts or those with‘necks'.Therefore,the fracture network zone becomes a by-passed oil zone,and the recovery efficiency is inversely proportional to the coverage of the fracture network.Hence,successful‘3D-Shattered Fracturing(3DSF)'in shale gas reservoir can't be applied to develop tight oil reservoir.It's suggested that researchers should try to find more proper methods to improve single well productivity without reducing recovery efficiency.
出处
《内蒙古石油化工》
CAS
2015年第17期146-147,共2页
Inner Mongolia Petrochemical Industry
关键词
渗流力学
渗流运动学
页岩气藏
广密压裂
采收率
物态方程
能量最小原理
滞油区
Mechanics of fluids in porous media
Kinematics of fluids in porous media
Shale gas reservoir
3D-Shattered Fracturing
Recovery efficiency
Equation of state
Principle of minimum energy
By-passed oil zone
