鄂尔多斯盆地长7致密油启动压力梯度变化规律研究  

Study on Variation of the Starting Pressure Gradient of Chang 7 Tighet Oil in Erdos Basin

作　　者：樊建明[1,2] 李卫兵[1,2] 韩会平[1,2] 李世辉[3] 杨子清[1,2] 

机构地区：[1]中国石油长庆油田公司勘探开发研究院,西安710018 [2]低渗透油气田勘探开发国家工程实验室,西安710018 [3]中国石油长庆油田公司第四采油厂,靖边718500

出　　处：《科学技术与工程》2014年第28期27-31,共5页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05013-004);中国石油天然气股份公司重大专项(2011E-2602)资助

摘　　要：针对致密油岩心驱替实验时常规压差流量法,流量和压力误差较大的问题,提出采用低压定压装置作为压力源进行驱替、光电式微流量检测计计量流量的新方法。实验结果表明：单相水启动压力梯度和束缚水状态下油启动压力梯度都随气测渗透率的降低而增大,且在相同渗透率条件下,束缚水状态下油启动压力梯度大于单相水启动压力梯度;对于储层渗透率介于（0.1~0.3）×10-3μm2的长庆油田下一步稳产致密油资源,单相水下的拟启动压力梯度平均值为0.31 MPa/m,真实启动压力梯平均值为0.18 MPa/m,启动压力梯度为渗透率大于0.3×10-3μm2的储层相应启动压力梯度的10倍以上;束缚水下的拟启动压力梯度平均值为3.19 MPa/m,真实启动压力梯平均值为0.58 MPa/m,启动压力梯度为渗透率大于0.3×10-3μm2的储层相应启动压力梯度的5倍以上,掌握致密油启动压力变化规律对于制定合理的开发技术政策有至关重要的意义。For dense oil core flooding experiments, the conventional pressure problem-flow method with big error on flow and pressure, a new method was put forward using the low pressure constant pressure device as a source of pressure of displacement, the photoelectric micro mass flow meter for measuring flow. The experimental results show that： the starting pressure gradient of single phase water and the starting pressure gradient of bound water increase with the reduce of gas permeability, and in the same conditions, the starting pressure gradient of bound water state oil is greater than the single-phase water; the tight oil reservoir permeability between （0. 1 -0. 3 ）×10-3μm2 is the stable production resources to Changqing Oilfield infurture, the start-up pressure gradient of single phase water is 0. 31 MPa/m, the real starting pressure gradient is O. 18 MPa/m, the starting pressure gradient islO times greater than 0. 3 ×10-3μm2 permeability reservoir; the average value of the start-up pressure gradient of the bound water is 3.19 MPa/m, the real starting pressure gradient is O. 58 MPa/m, the starting pressure gradient for permea- bility is 5 times greater than the corresponding reservoir which permeability is greater than 0. 3×10-3μm2, hold tight oil start-up pressure change is essential for the development technology.

关 键 词：致密油 启动压力梯度 微流量检测 鄂尔多斯盆地 

分 类 号：TE311[石油与天然气工程—油气田开发工程]