内源微生物激活剂在人造长岩心中的分布规律

Distribution of activator for endogenous microbe in large-scale oil recovery experiments

为了明确油藏微生物激活剂组分在油藏中的分布规律,以5 600 mm的人造岩心为物理模型,研究了沾3现场激活剂配方在长时间水驱过程中的动态变化规律,分别在不含微生物消耗和含微生物消耗的情况下,拟合出内源微生物激活剂组分的长距离运移衰减方程。研究表明:长岩心运移实验中,硝酸盐、磷酸盐、玉米浆3种组分随运移距离增加都呈现出衰减趋势,峰值浓度和衰减速度不断降低。长岩心对于激活剂各组分的吸附能力有一定的差别,吸附能力由小到大依次是N、P、玉米浆,微生物对于激活剂各组分的消耗比例由小到大依次是玉米浆、N、P。在开始注入阶段,带微生物消耗的激活剂运移损耗巨大并出现色谱分离现象,当激活剂运移到2.5 m的位置时,基本消耗殆尽。因此,常规注入方式很难使激活剂有效进入到油藏深处。

We studied activator （a nutrients-containing medium for endogenous microbe） distribution in a series of flooding experiments in a large-scale sand-pack column （5 600 mm ）. The distribution and transportation of the nutrients in the activator were observed by microbial consumption whereas the control was done in experiments with previously sterilized column. The nutrients in the activator including nitrate, phosphate, corn syrup decreased with the distance of migration. The components of nutrient had dirt^rent adsorption capacity by the sand-pack, with the order of N 〈 P 〈 corn syrup. With the consumption of nutrients by endogenous microorganisms ,the order of consumption was corn syrup〈N〈P. At the beginning of the injection with the activator, with the consumption of nutrients by microorganisms and nutrients migration ,huge decrease of the nutrients appeared. When the activator migrated into 2.5 m depth, nutrients were hardly detectable. Therefore, the conventional injection of activator is difficult to enter effectively into reservoir depths.