) 2) ( ) TE348 A DOI / A GLOBAL-ORIENTED METHOD TO MEASURE THE THRESHOLD PRESSURE GRADIENT IN MICR

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1 ) 2) ( ) TE348 A DOI / A GLOBAL-ORIENTED METHOD TO MEASURE THE THRESHOLD PRESSURE GRADIENT IN MICRO-CHANNELS 1) WAN Haiyan 2) (Geological Scientific Research Institute of Shengli Oilfield Co. Ltd., Sinopec, Shandong, Dongying , China) Abstract A global oriented method of measuring of the threshold pressure gradient (TPG) in micro-channels was studied in this paper, in order to more accurately measure the TPG in the low permeability porous media. The method includes the static measurement and the steady flow experiments, and can be defined as the global-oriented method to measure the threshold pressure gradient, which can be used to analyze the pressure responses when the deionized water changes from the static state to the steady flow state in micro-channels. The experiments indicate that the threshold pressure gradient in the steady flow experiments is 14.5 times of that obtained by the static method, which shows that the previously published experimental values are too large, and are difficult to be used in the oil development. The results show that the global-oriented method of measuring the TPG can be applied for low permeability cores to obtain more precise parameters, and the TPG is verified when the liquid flows in micro-channels. Key words micro-scale effect, micro-channel, the threshold pressure gradient, low permeability reservoir [1-2]. Darcy [3-7]. v p ) 2) slofwhy@163.com

2 (real-threshold pressure gradient, RTPG) ( 1 a ) ( ) [8-9] 1 c -- (pseudo-threshold pressure gradient, PTPG) 0, p G P v = K (1) µ p(1 G P/ p ), p > G P, v m/s K µm 2 µ Pa s p Pa G P Pa/m. [10] [11].. 0 ( [12] ).. ( ) [13] [13]. 1.1 (1) (2) U (3) ; (4) (5)

3 (6), (4) (5) (7), G = ρg h (2) L, G Pa/m ρ kg/m 3 g m/s 2 h m L m µm kpa/m. 20 µm 1. 1 L/ h/ P / dp / dp / dl dl mm mm Pa (kpa m 1 ) (kpa m 1 ) Poiseuille [14-15] ( ). 3 3 [15] µm 4

4 3 65 (threshdd pressure gradient, TPG) 0.24 MPa/m kpa/m TPG µm.. 5. (1) (2) ( ) µm. (1) (2) (3) ; (4) (10): (Luo Pingya. Research on several issues of the exploration and development on the low-permeability oil and gas resources. World Petroleum Industry, 1998, 5(10): (in (3) (Ren Xiaojuan, Yan Qinglai, He Qiuxuan, et al. The experiment study of characteristics of gas flow in tight formation. Journal of Xi an Petroleum Institute, 1997, 12(3): (in (1) 9-14 (Huang Yanzhang. Nonlinearity transfusion characteristics of low-permeability reservoir. Special Oil & Gas Reservoirs, 1997, 4(1): 9-14 (in 6 ( ) (5) (Xu Shaoliang, Yue Xiang an. Experimental study of low velocity nonlinearity flow characteristic. Journal of China University of Petroleum (Edition of Natural Science), 2007, 31(5): (in (4) (Wang Ruifei Shen Pingping Song Ziqi, et al. Microcosmic pore throat characteristic of ultra-low permeability in sandstone reservoir stratum. Acta Petrolei Sinica, 2009, 30(4): (in , 22(03) (Song Fuquan, Liu Ciqun, Wu Baizhi. The fast transient measurement of threshold pressure gradient. Acta Petro Sinica, 2001, 22(3): (in 9. / (3) (Zhu Weiyao, Liu Jinzi, Song Hongqing. Calculation of effective startup degree of non-darcy flow in low or ultra-low permeability reservoirs. Acta Petro Sinica, 2010, 31(3): (in ( 45 )

5 K K 3 PIV 1cSt 0 25 K. 1 Birikh RV. Thermocapillary convection in a horizontal layer of liquid. Journal of Applied Mechanics and Technical Physics, 1966, 7(3): Smith MK, Davis SH. Instabilities of dynamic thermocapillary liquid layers. Part 1. Convective instabilities. Journal of Fluid Mechanics, 1983, 132: Smith MK, Davis SH. Instabilities of dynamic thermocapillary liquid layers. Part 2. Surface-wave instabilities. Journal of Fluid Mechanics, 1983, 132: Riley RJ, Neitzel GP. Instability of thermocapillary buoyancy convection in shallow layers. Part 1. Characterization of steady and oscillatory instabilities. Journal of Fluid Mechanics, 1998, 359: Burguete J, Mukolobwiez N, Daviaud F, et al. Buoyantthermocapillary instabilities in extended liquid layers subjected to a horizontal temperature gradient. Physics of Fluids, 2001, 13(10): ,,. --., 2004, 36(6): (Duan Li, Kang Qi, Hu Wenrui. Experimental study on the influence of the depth of liquid layer to free surface in buoyant--thermcapillary convection. Chinese Journal of Theoretical and Applied Mechanics, 2004, 36(6): (in [ ]. :, 2006 (Chen Jie. Experimental study on buoyant-thermocapillary convection stability using PIV. [Master Thesis]. Beijing: Institute of Mechanics, Chinese Academy of Sciences, 2006 (in 8 Kawamura H, Tagaya E, Hoshino Y. A consideration on the relation between the oscillatory thermocapillary flow in a liquid bridge and the hydrothermal wave in a thin liquid layer. International Journal of Heat and Mass Transfer, 2007, 50: Riley RJ, Neitzel GP. Instability of thermocapillary buoyancy convection in shallow layers. Part 1. Characterization of steady and oscillatory instabilities. Journal of Fluid Mechanics, 1998, 359: ( : ) ( 65 ) (4) 1-4 (Liu Yuewu, Ding Zhenhua, He Fengzhen, et al. Three kinds of methods for determining the start-up pressure gradients in low permeability reservoir. Well Testing, 2002, 11(4): 1-4 (in (4) (Deng Ying er, Liu Ciqun. Mathematical model of nonlinear flow law in low permeability porous media and its application. Acta Petrolei Sinica, 2001, 22(4): (in (3) (Song Fuquan. Research of the size effect of liquid flow in low permeability porous media and microchannels. Nature Magazine, 2004, 26(3): (in 13 Song FQ Jiang RJ Bian SL. Measurement of threshold pressure gradient of microchannels by static method. Chinese Physics Letters (7) (3): (Li Zhanhua, Zhou Xingbei, Zhu Shannong. Flow characteristics of nonpolar organic liquid swith small molecules in a microchannel. Acta Mechanica Sinica, 2002, 34(3): (in 15 Jiang RJ Song FQ. Flow characteristics of deionized water in microtubes. Chinese Physics Letters 23(12) ( : )

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