油藏渗透率与水淹程度对微生物驱油效果的影响  

The Effect of Reservoir Permeability and Watered-Out Severity on Microbial Enhanced Oil Recovery

作　　者：陈晔[1] 董汉平[1,2] 汪玉琴 李红 李亚楠[2] 谢玉银 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]中国石油新疆油田分公司实验检测研究院,新疆克拉玛依834000 [4]中国石油大学提高采收率研究院,北京102249

出　　处：《新疆石油地质》2013年第6期689-692,共4页Xinjiang Petroleum Geology

基　　金：国家863项目(2013AA064402)

摘　　要：为了探究油藏渗透率与水淹程度对微生物驱油效果的影响，采用一系列不同渗透率岩心，模拟新疆克拉玛依油田六中区油藏条件（渗透率39．7—505．5mD）注入高产表面活性剂菌WJ-1，同时对注菌后二次水驱采出液的表面张力与界面张力进行检测，对比分析了不同渗透率环境下微生物提高采收率、呆出液的表面张力与界面张力的变化特征。将相同渗透率岩心一次水驱至含水率5％，35％，65％，98％分别代表不同水淹程度的油藏环境，注入WJ-1对比二次水驱后微生物提高采收率的效果。实验结果表明，微生物采油效果随油藏渗透率的增大而显著提高，在505．5mD高渗透岩心中效果最好，提高原油采收率5．42％，采出液的表面张力由72．0mN／m降低至70mN／m，界面张力由12．0mN／m降低至5．9mN／m；微生物采油效果随油藏水淹程度的升高而降低，含水率5％时注入微生物可提高采收率21．98％．To investigate the influences of reservoir permeability and watered-out severity on indigenous microbial enhanced oil recovery （IMEOR）, indigenous pseudomonas aeruginosa W J-l, a high-yield biosurfactant strain, was injected into the core samples of different val- ues of permeability （37.9-505.5 roD） after primary water flooding in the reservoir condition of District-mid-6 in Karamay oilfield, and then the surface tension （ST） and oil-water interracial tension （IFT） of produced fluid after secondary water flooding were measured to cmTelate and analyze the variations of the IMEOR, ST and IFT. In addition, the core samples with same permeability was flooded by primary water injection to reach the water cuts of 5%, 35%, 65% and 98%, which mean non-watered-out, weak watered-out, medium watered-out and heavily watered-out reservoir environments, respectively, with which the WJ-1 biosurfaetant was injected into the same core samples to cor- relate the effect of such a IMEOR. The experimental results show that the effect produced by the [MEOR process distinctly increases with the reservoir permeability increasing. Compared with low-pemleability core samples, the high-permeability core sample of 505.5 mD has the best effect by using the IMEOR process, with additional EOR of 5.42%, low ST of 70.0 mN/m reducing from 72.0 mN/m and low IFT of 5.9 mN/m reducing from 12.0 mN/m. Also, the effect by IMEOR process reduces with the increasing of reservoir watered-out severity. In- jecting the WJ- 1 biosurfactant into the core samples when the water cut in the produced fluid reaches 5% after primary water flooding, 21.98% of additional EOR can be gained.

关 键 词：微生物提高采收率 渗透率 水淹程度 表面张力 界面张力 

分 类 号：TE357.9[石油与天然气工程—油气田开发工程]