Microbial Degradation Of The Resin And Asphaltene Indoor And Field Test Of Extra Thick

In many oil and gas fields of our country, heavy oil is widely distributed, which is mostly existed in shallow reservoirs. Because of the existence of colloid & asphaltene, the viscosity of heavy oil is mostly so high. Microbial enhanced oil recovery technology is an economic and effective measure, which is important to the continuous development of constructing well. This paper is based on colloid & asphaltene of extra-extra-heavy oil components constituting the majority in the District 9 of Karamay, specially developing microbial huff & puff indoor research and field test. The twice plot field trials were treated by microbial huff & puff in Karamay oil field and some achievements were obtained.1. This paper selects suitable bacteria to effectively treat extra-extra-heavy oil of Karamay by means of indoor bacteria research method and the bacteria can degrade colloid & asphaltene of extra-extra-heavy oil remarkably, which has the capability of emulsification and decentralization.2. DNA trial show 97a has a length of 700 bp differential strip and 98a has a length of 686bp differential strip. They have the same commonness, that is to say, they both have a length of 479 bp strip.3. Single core model oil-displacing experiment shows that the oil recovery of microbial flooding is 10.93% higher than that of water flooding under the same conditions. Flat model oil-displacing experiment shows that oil recovery is enhanced by 8.33% in 98715 well and 8.97% in 98725 well differently after bacteria treatment.4.The results of Microbial huff & puff field trial show a 100% success, the cumulative incremental oil is 939t.The second constructing measure efficiency show a 93.3% success, the cumulative incremental oil is 1189t.The effects of bacteria last more than 3 months and the input-output ratio is more than 1:2.406 and 1:6.63. Judged from economic effect, the two measures are successful. So, microbe huff & puff technology is considered to be feasible and economical. Microbe huff & puff technology provides a new way for Karamay extra-heavy oil field after steam huff & puff or steam flooding.