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Daqing, China

Ai M.-Q.,CAS Shenyang Institute of Applied Ecology | Ai M.-Q.,University of Chinese Academy of Sciences | Li H.,CAS Shenyang Institute of Applied Ecology | Liu X.-B.,Oilfield Co. | And 5 more authors.
Chinese Journal of Applied Ecology

By the methods of molecular biology, this paper studied the bacterial community structure in the production waters from polymer-flooded, water-flooded, and transition zone ' s oil reservoirs in Daqing Oilfield of Northeast China. The total DNA was extracted from the three production waters, and the 16S rDNA clone libraries of the waters were constructed. About 200 positive clones were randomly selected from each library, and analyzed with amplified ribosomal DNA restriction analysis (ARDRA). The selected 596 positive clones were clustered into 85 operational taxonomie units (OTUs) , with 28 OTUs in polymer-flooded library, 41 in water-flooded library, and 33 in transition zone ' s library. Sequences analysis of the libraries showed that the dominant bacterial groups in the production waters were Acinetobacter, Arcobacter, Firmicutes, Pseudomonas, and Sulfurospirillum. Polymer-flooded sample had the simplest bacterial composition, with the dominant (85% ) of Acinetobacter, and part (7% ) of Pseudomonas. Water-flooded sample was also dominated by Acinetobacter (62% ), while Pseudomonas and Sulfurospirillum occupied 20% and 6% of the total, respectively. Different from the former two, the transition zone ' s sample was dominated by Arcobacter (50% ) , followed by Acinetobacter (19%) and Firmicutes (18%). Source

Zeng B.Y.,Northeast Petroleum University | Ma S.Z.,Northeast Petroleum University | Wang W.G.,Northeast Petroleum University | Cheng J.Y.,Oilfield Co.
Advanced Materials Research

The distribution of oil and water in Xinmiaoxi-Xinbei area Fuyu reservoir is very complicated and the variation of productivity is very large The distribution on the whole is continuous,but there are special hydrocarbon accumulation characteristics that lower place oiliness but high location multi-water From the six major geological factors: source, reservoir and cap rock, trap, migration,and preservation condition, synthetically considering the distribution of mature source rock, underwater distributary channel's distribution, the matching relation of fault and sand, single trap and inherited palaeostructure, combined with the distribution regular of reservoir to study the enrichment regularity of research Finally find that this research area has a accumulate characteristics, that is, ancient tectonic controlled potential, the single trap reservoir control the reservoir, lithology control boundary, single sand bodies control layer Among these, the high ancient structure formed before the peak of hydrocarbon expulsion is the advantage point oil and gas migration, is also the main control factors of continuous distribution of oil and gas; Single trap is the main controlling factor of the complex oil-water distribution that high position is water and low position is oil, and then we can determine the cause of the complex regularities of oil-water distribution. © (2014) Trans Tech Publications, Switzerland. Source

Li G.,CAS Shenyang Institute of Applied Ecology | Guo S.,CAS Shenyang Institute of Applied Ecology | Wang S.,CAS Shenyang Institute of Applied Ecology | Lu B.,Oilfield Co.
Petroleum Science and Technology

An aged emulsion from polymer flooding was dewatered using demulsification and centrifugal separation, and factors of influence on electrical dehydration were investigated. The lowest moisture (0.12%) was achieved at 16000 rpm separated separation. In recycled oil, there were significantly decreases in content of nitrogen, impurities, and iron. The results of simulative electrical dehydration showed that a small amount of separated wastewater (10%) could increase current continually. However, the recycled oil can achieve a satisfactory result of dehydration even mixed with 30% wastewater. It indicated that polymer, impurities, resins, and asphaltene contributed to the electric field collapse of the electric dehydrator. © 2014 Taylor & Francis Group, LLC. Source

The characteristics of petrochemistries, microelements and rare earth elements of sandstone samples from Chang9-10 members of Yanchang Formation of lingl well are systematically studied. By using structural distinguished figures of different macroelements and microelements, the source area structural attributes of lingl well are analyzed and discussed. The results show that; The microelement content in sandstone samples of Yanchang Formation from lingl well area is stable; In microelement distribution curves, light rare earth elements (LREE) are evidently concentrated but heavy rare earth elements (HREE) are depleted; According to the structural distinguished figures of different macroelements and microelements, the structural backgrounds of source area are mainly active continental margin and islands; The Lingl well area is located in hinterland in Odors basin, its sediments are mixed provenance, and its evolution course is controlled by Qinling orogenis belt which results from combination Huabei plate with Yangtze plate. To late Triassic, Qinling orogenis belt became stable source area of Lingl well. Source

Oilfield Inc. | Date: 1978-01-10


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