微生物驱后油田采出液地面增殖技术

Surface Multiplication Technology of Produced Water after MEOR

任付平 余吉良 陈京生 霍然 邵忠华 刘倩 吴应德

REN Fuping YU Jiliang CHEN Jingsheng HUO Ran SHAO Zhonghua LIU Qian WU Yingde

利用微生物驱后油田采出液中的有益菌群，在室内开展了微生物驱采出液地面增殖技术研究。该方法可使回注的采出液菌数由6.4×105个/mL增至3.6×108/mL；采出液中的有益菌群烃氧化菌、发酵菌、反硝化菌菌数增加3率4 个数量级，有害菌硫酸盐还原菌菌数降低1 个数量级；向微生物驱采出液中添加营养剂和油田混合油，乳化液表面张力降低35.4%，原油黏度降低43.0%。通过整体提高注入液菌数，可使采出液菌数增至107个/mL，采收率在原微生物驱的基础上增加10.67 百分点。利用现场污水处理流程中的处理容器开展了现场试验，措施后回注采出液菌数提高到5.8×108个/mL，采出液菌数达到3.0×106个/mL，阶段累计增油2.005 万吨，投入产出比为1∶3.2。图4 表2 参14

Surface multiplication experiment after MEOR was carried out using beneficial bacterial in produced water. The concentration of bacteria increased from 6.4 × 105 cells/mL to 3.6 × 108 cells/mL and that of the beneficial bacterium including hydrocarbon bacteria，fermentation bacteria and denitrifying bacteria increased 3—4 levels per milliliter after surface fermentation. And the same time，that of the baleful bacterium，sulfate reducing bacteria，decreased 1 level per milliliter. After nutrition and mixed oil were added to produced water after MEOR，the surface tension of oil-water emulsion decreased 35.4%，and the oil viscosity decreased 43.0%. When physical model experiment carried out ， the bacterial count in produced water reached to 107 cells/mL，and the oil recovery increased 10.67 percent point on the basis of original microbial enhanced oil recovery method. In combination with the surface multiplication technology and oilfield sewage disposal system，and after the new microbial flooding was carried out，the whole bacteria concentration of reinjection produced fluid increased to 5.8×108 cell/mL，and that of produced liquid increased to 3.0×106 cell/mL，cumulative quantity of oil was 20050 tons，the ratio of input to output was 1∶3.2.