特低渗透扶杨油层技术动用下限研究

Study on Lower Limit of Producing of Ultra-low Permeability Reservoir in Fuyang Formation

大庆外围油田扶杨油层为低孔特低渗透储层,开发难度大、经济效益差是制约扶杨油层储量动用程度的瓶颈。在认真分析特低渗透储层出油能力和产油状况的基础上,针对特低渗透储层存在启动压力梯度以及具有非线性渗流的特点,提出了应用试上限定下限的试油趋近法、可动孔喉半径法及拟启动压力法综合确定特低渗透扶杨油层技术动用下限的新技术新方法,应用上述三种方法并结合矿场资料进行综合确定地层原油粘度在4mPa·s条件下,特低渗透扶杨油层的技术动用下限渗透率为0.5×10^(-3)μm^2。

Fuyang formation of Daqing periphery oilfield are characterized by ultra-low permeability and low porosity with great development difficulties and low economic benefit is the bottleneck that restricts the Fuyang formation reserve put to use effectively. Based on the analysis on capacity and production of ultra-low permeability reservoir seriously, directly against threshold starting pressure and non-linear vadose in ultra-low permeability reservoir,a series of new methods such as production test approaching method ( determine lower limit by testing upper limit) , movable radius of pore throats and proposal threshold starting pressure method were put forward to eomprehansive determine the technical lower limit of producing of ultra-low permeability reservoir- Fuyang formation. Combining three methods metioned above with field data determine the condition of crude oil viscosity under 4 mPa · s, the technical lower limit of producing of ultra-low permeability reservoir- Fuyang formation is 0.5×10-3·m2.