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RISS 인기검색어
- 검색키워드
- 저자 : Zhaobiao Yang (검색결과 3 건)
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Zhaobiao Yang,Congcong Wu,Yong Qin,Geng Li,Zonghao Qin 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.4
The geochemical information of produced water from coalbed methane (CBM) wells is abundant in geological significance. Based on the conventional ions, hydrogen and oxygen isotopes (δD and δ18O) and trace element tests of 27 produced water samples from CBM wells, the geochemical identification of the source and environment of produced water from CBM wells and its productivity significance have been analysed. The following conclusions have been drawn: CBM produced water can be divided into three categories, namely, polluted water from frac fluids, polluted surface water and formation water. The formation water has low Cl– concentration, low total dissolved solids (TDS) concentration, and light δD and δ18O. The water polluted by frac fluid has high Cl– and TDS concentrationt, and heavy δD and δ18O. The polluted surface water has high SO42– and light δD and δ18O. CBM groundwater environments can be divided into confined and unconfined systems. The confined system is characterized by low Na+/Cl– value, high (Cl– – Na+)/Mg2+ value, a general absence of SO42–, high Sr and Ba and low F. The unconfined system is characterized by high Na+/Cl– value, low (Cl– – Na+)/Mg2+ value, low SO4 2–, low Sr and Ba and high F. Constructing a cross plot with the new D drift index (d’) value and Cl– concentration can further identify four types of source-water environments: an unconfined formation water system, an unconfined surface water system, a confined system heavily polluted by frac fluids, and a confined system only slightly polluted by frac fluids. The unconfined system often produces more formation water and has high CBM production. The confined system often produces water more heavily polluted by frac fluids and is low in CBM production. The fitting formulas of hydrochemical productivity have been established for daily CBM and water production of CBM wells.
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Analysis of multi-coalbed CBM development methods in western Guizhou, China
Zhaobiao Yang,Yong Qin,Tongsheng Yi,Jun Tang,Zhengguang Zhang,Congcong Wu 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.2
After more than 20 years of development, the exploration and production of multi-bed coalbed methane in western Guizhou is now in a key growth phase. Based on geological characteristics of CBM and requirements of main development engineering in this area, we have looked into suitable fracturing and drainage modes for this area. This study shows that the Liupanshui coalfield has a high stress field, so staged fracturing with large discharge and high volume of fracturing fluid and sand and increase of the used quantity of high strength ceramic beads is effective for this kind of multi-bed coal reservoir. In contrast, Zhina coalfield has a relatively low stress field, and the Qianbei coalfield has transitional stress conditions. Separate layer fracturing by sleeve diverter in the Zhijin block ensures effective fracturing of multi-production layers. This method enhances fracturing efficiency and decreases fracturing cost and is therefore recommended for the whole area. Coiled tubing fracturing widely used in other countries is recommended for the Zhina and Qianbei coalfields. Commingled drainage and production is considered the best choice for the development of multi-bed CBM reservoirs. The basic geologic conditions for commingled drainage production of multiple layers are that the main productive layers can be ensured to produce gas preferentially and smoothly and the critical desorption pressure liquid level of other productive layers are above the roof depth of the main productive layers. On this basis, all the layers can be produced in an orderly manner by regulating the casing pressure and liquid level depth in different draining phases.
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DNA Microarray-Based Global Transcriptional Profiling of Yersinia pestis in Multicellularity
Jingfu Qiu,Zhaobiao Guo,Haihong Liu,Dongsheng Zhou,Yanping Han,Ruifu Yang 한국미생물학회 2008 The journal of microbiology Vol.46 No.5
Yersinia pestis, the causative agent of plague, has a feature of forming multicellular aggregates at liquid-air interface around the wall of glass tube. In this study, we employed the whole-genome DNA microarray of Y. pestis to investigate the global transcriptional profile in multicellularity compared with that in its planktonic growth. A total of 177 genes were differentially expressed in Y. pestis during early stage of multicellular formation; Seventy genes of them were up-regulated while 107 down-regulated. In addition to a large number of genes encoding unknown functions, most of the induced genes encode cell envelope and transport/binding proteins. The up-regulation of amino acid biosynthesis, the differentially altered genes that are involved in virulence, and the cold shock protein genes were for the first time reported to be associated with the multicellular formation. Our results revealed the global gene expression of Y. pestis were changed in the formation of multicellularity, providing insights into the molecular mechanism of multicellular behaviour, which need investigating further.
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