深层稠油油藏微生物吞吐技术研究与应用

Research and Application of the Technology for Microbial Huff and Puff in Deep Heavy Oil Reservoir

杜 勇 段志刚

DU Yong，DUAN Zhigang

针对深层稠油油藏桩 139块部分井注汽压力高、 且二次 DC冷采效果不好的低液低产现状， 开展了微生物吞吐采油技术研究与应用。根据试验井所处的油藏特征和原油性质， 优选了微生物复合吞吐体系主要成分， 并按设计的注入段塞应用于桩西油田和太平油田。结果表明， 采用激活剂 II （0.4%糖蜜+0.2%玉米浆干粉+0.2%糊精+0.2% NaNO3 +0.02%（NH4 ） 2HPO4 ）、 含地芽孢杆菌属的外源菌液和 0.1%槐糖脂类生物表面活性剂配制的微生物复合吞吐体系， 在 pH值为 5的条件下， 乳化原油效果好， 产气量较大。在矿场以 6 m3 /h注入主段塞 200 m3 的微 生物复合吞吐体系后， 原油黏度降幅 50.1%， 增油有效期 166 d， 累计增油 915 t， 投入产出比 1∶9.07， 经济效益明显提高。表2参14

Aiming at the problem of low liquid and low yield in Zhuang 139 block wells in deep heavy oil reservoir，which did not get good results of the second cycle of DC as a result of high pressure of steam injection，the technology for microbial huff and puff in deep heavy oil reservoir was studied. According to the reservoir characteristics and crude oil properties of test well，the main components of microbial complex huff and puff system were optimized，which was applied to Zhuangxi oilfield and Taiping oilfield by designed injection slug. The results showed that by using microbial compound system that consisted of activator II（0.4% molasses+0.2% corn pulp dry powder+0.2% dextrin+0.2% NaNO3 +0.02%（NH4 ） 2HPO4 ），inoculating microbes containing bacillus polymyxa. and 0.1% surface active agent of Sophora japonica lipid biologic surfactant，the effect of emulsified crude oil was good and gas production was great under the pH value of 6. The viscosity of crude oil reduced by 50.1%，the oil increase period was 166d，the cumulative oil increased 915 t，the input-output ratio was 1∶9.07，and the economic benefit was obviously improved after microbial compound system was injected in field with 6 m3/h injection speed and 200 m3 main slug