Li J.,China Institute of Technology |
Xie G.,Xinjiang Oilfield Co.
Well Testing | Year: 2014
Perforation technology to Horizontal well plays a very important role in the gas storage construction, and Nitrogen pressuring perforation provides a guarantee for the perforating operation with long horizontal section. Among those perforating methods, nitrogen positive-pressure perforating tech, combing with positive-pressure perforating, negative pressure reverse impact and gas fracturing, improves productivity and removes pollution, and has widely usages in perforation of the horizontal well. The key work for nitrogen positive-pressure perforating is to determine nitrogen pressure value. Therefore, study on the rising pressure time for pressure perforating is particularly important. Three ways are introduced that are the nitrogen being injected into tubing and casing simultaneously, nitrogen truck pumped into casing, and tubing being seal, and the finally of liquid nitrogen being injected from casing, when coming into minimum ignition pressure, meanwhile pump truck and liquid nitrogen car are pressuring ignition, the rising pressure time models of minimum ignition pressure to maximum ignition pressure are established in different ways. Combing various parameters of horizontal well, the third way is selected to the most optimal scheme at present, which gives some theoretical basis for nitrogen pressure perforating of horizontal well.
Li D.,China University of Geosciences |
He D.,China University of Geosciences |
Tang Y.,Xinjiang Oil Field Company |
Fan C.,China University of Geosciences |
Kong Y.,Xinjiang Oil Field Company
Acta Petrologica Sinica | Year: 2012
Carboniferous tuff in the Di'nan uplift widely developed at the southern edge of the Luliang Uplift in Junggar Basin. This paper fully reports the Carboniferous tuff from Well Dixi-14 about the study of zircon SHRIMP U-Pb dating, geochemistry and tectonic environment. Zircon samples have obvious oscillatory zoning characteristics, and SHRIMP zircon U-Pb ages (337. 2Ma) reveal that the tuff formed in Early Carboniferous. Volcanic rocks have the uniform characteristics with high SiO2 (63. 47% - 77. 36%), low TiO2 (0. 19% - 1. 01%), Na2O (0. 98%-4. 01%) content and Mg# value (21-53), and K2O/Na2O ratio range from 0. 56 to 2. 09, A/CNK > 1. Besides, Σ REE are relatively high, and the tuff has significant negative Eu anomalies, and La/Nb ratio has a range from 1. 71 to 3. 74. Trace element diagram standardized by primitive mantle are characterized that LILE (Rb, Th, Ba, etc.) is relatively enriched, while HFSE (Nb, Ta), particular Sr, P and Ti element is relatively depleted. Geochemical characteristics above show that Carboniferous tuff in the south side of Di'nan uplift have crust source characteristics, which demonstrates that the tuffs were the products of active continental margin. Furthermore, comprehensive stratigraphic column of Well Dixi-14 show that the deep and shallow tuff have similar geochemical characteristics, and shallow tuffs have relatively lower SiO2 content than deep ones. Combined with analysis from SHRIMP zircon U-Pb ages of volcanic rocks and the regional geological setting, we consider that the Ludong area was still in the subduction-related environment in Early Carboniferous, and the closure time of Kalameili ocean basin was no earlier than 337. 2Ma. The ocean basin which represented by Kalamaili-San'gequan (Luliang Uplift)-Darbute tectonic belt showed a scissors-type closure model from east to west since Early Carboniferous, and lower volcanic rocks of Batamayineishan Formation were products of the Early Carboniferous arc magma, which supports the view that Junggar Basin have arc splicing basement. There existed a porential pattern of multi-island tectonic framework in Junggar area in Carboniferous. View from the genesis of Early Carboniferous volcanic rocks of Di'nan uplift and tectonic setting around the Junggar Basin, the arc-arc amalgamation may be the main body of basement of Junggar Basin. In addition, no old zircon has been discovered from these studied samples, suggesting that there may not exist the Precambrian basement in the Junggar Basin.
Li H.,Gansu Electric Power Company |
Yu J.,Xinjiang Oilfield Company
Gaoya Dianqi/High Voltage Apparatus | Year: 2014
Taking two defects in the hydraulic mechanism of a 800 kV pot-type breaker for example, the working principle of the mechanism is introduced, and the implementation of the check and repair process is analyzed in detail. The defects are found to be caused by larger air content in hydraulic oil. As a result, vacuumizing and oil feeding are adopted to eliminate the defect. In addition, some countermeasures are put forward to prevent this kind of defects, such as strictly implementing the check and repair process, optimizing the design of the hydraulic mechanism, and testing oil, etc.
Bizhu H.,Chinese Academy of Geological Sciences |
Menglin Z.,Xinjiang Oilfield Company
Acta Geologica Sinica | Year: 2016
The formation and evolution of basins in the China continent are closely related to the collages of many blocks and orogenic belts. Based on a large amount of the geological, geophysical, petroleum exploration data and a large number of published research results, the basement constitutions and evolutions of tectonic–sedimentary of sedimentary basins, the main border fault belts and the orogenesis of their peripheries of the basins are analyzed. Especially, the main typical basins in the eight divisions in the continent of China are analyzed in detail, including the Tarim, Ordos, Sichuan, Songliao, Bohai Bay, Junggar, Qiadam and Qiangtang basins. The main five stages of superimposed evolutions processes of basins revealed, which accompanied with the tectonic processes of the Paleo–Asian Ocean, Tethyan and Western Pacific domains. They contained the formations of main Cratons (1850–800 Ma), developments of marine basins (800–386 Ma), developments of Marine–continental transition basins and super mantle plumes (386–252 Ma), amalgamation of China Continent and developments of continental basins (252–205 Ma) and development of the foreland basins in the western and extensional faulted basin in the eastern of China (205–0 Ma). Therefore, large scale marine sedimentary basins existed in the relatively stable continental blocks of the Proterozoic, developed during the Neoproterozoic to Paleozoic, with the property of the intracontinental cratons and peripheral foreland basins, the multistage superimposing and late reformations of basins. The continental basins developed on the weak or preexisting divisional basements, or the remnant and reformed marine basins in the Meso–Cenozoic, are mainly the continental margins, back–arc basins, retroarc foreland basins, intracontinental rifts and pull–apart basins. The styles and intensity deformation containing the faults, folds and the structural architecture of regional unconformities of the basins, responded to the openings, subductions, closures of oceans, the continent–continent collisions and reactivation of orogenies near the basins in different periods. The evolutions of the Tianshan–Mongol–Hinggan, Kunlun–Qilian–Qinling–Dabie–Sulu, Jiangshao–Shiwandashan, Helanshan–Longmengshan, Taihang–Wuling orogenic belts, the Tibet Plateau and the Altun and Tan–Lu Fault belts have importantly influenced on the tectonic–sedimentary developments, mineralization and hydrocarbon reservoir conditions of their adjacent basins in different times. The evolutions of basins also rely on the deep structures of lithosphère and the rheological properties of the mantle. The mosaic and mirroring geological structures of the deep lithosphère reflect the pre–existed divisions and hot mantle upwelling, constrain to the origins and transforms dynamics of the basins. The leading edges of the basin tectonic dynamics will focus on the basin and mountain coupling, reconstruction of the paleotectonic–paleogeography, establishing relationship between the structural deformations of shallow surface to the deep lithosphère or asthenosphere, as well as the restoring proto–basin and depicting residual basin of the Paleozoic basin, the effects of multiple stages of volcanism and paleo–earthquake events in China. © 2016 Geological Society of China
Sun X.,China University of Petroleum - East China |
Zhang Y.,China University of Petroleum - East China |
Li K.,Xinjiang Oilfield Company |
Gai Z.,China University of Petroleum - East China
Fuel | Year: 2016
The main purpose of this study is to improve the numerical evaluation of gas injection enhanced coalbed methane (ECBM) recovery by establishing a new mathematical coalbed methane (CBM) simulation model, in which the two-dimensional Peng–Robinson equation of state (2D PR EOS) model and the Maxwell-Stefan bidisperse pore diffusion (MS-BPD) model for multicomponent gas adsorption and diffusion are implemented. First, the extended Langmuir, ideal adsorbed solution and 2D PR-EOS models were investigated and compared with the experimental data of pure and mixed gas for modeling multicomponent gas adsorption behavior. Then, the MS-BPD model was developed based on the 2D PR-EOS model, bidisperse diffusion mechanisms, and Maxwell-Stefan diffusion theory, which provided an improved simulation of multicomponent gas diffusion behavior. On the basis of previous research, we developed a new CBM simulation model to analyze the effects of injection gas composition on the gas injection ECBM recovery process. The results indicate that mixed-gas injections are able to enhance methane recovery. The optimum composition of injected gas is 75% N2 and 25% CO2, which increases methane recovery by 25% over the pressure depletion production process. This CBM simulation model will provide an effective technical approach for research and development of CBM by gas injection. © 2016 Elsevier Ltd
Zhou W.-D.,China University of Petroleum - East China |
Li L.-P.,China University of Petroleum - East China |
Kong C.-X.,Xinjiang Oilfield Company |
Wang J.-S.,China University of Petroleum - East China
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2013
In order to improve the reaming efficiency of radial horizontal well bore, the elliptical exit nozzle was introduced into the abrasive jet reaming technology. The Realizable κ-ε turbulence model was applied to the simulation of the nozzle with elliptical exit. Numerical results were compared with results of conical nozzle. The results show that the jet has a certain spreading and the diffusion angle on short shaft section is greater than that on the longitudinal profile. The jet velocity in the nozzle and the outlet velocity gradually decrease along with the length-width ratio increasing, while increase with the outlet diameter increasing. When the nozzle entrance velocity and outlet diameter are the same, the outlet axial velocity of the nozzle is less than that of the conical nozzle. When dimensionless nozzle distance is greater than 11.3, the jet velocity is greater than that of the conical nozzle. The nozzle export section width increases with the distance from nozzle increasing, and the reaming width of the elliptical exit nozzle is greater than that of conical nozzle under the same conditions. The jet has self-moldability. The numerical results agree well with the experimental results of abrasive jet reaming.
Yin S.,China University of Petroleum - Beijing |
Wu S.,China University of Petroleum - Beijing |
Xu C.,Xinjiang Oilfield Company |
Zhang L.,China University of Petroleum - Beijing |
Feng W.,China University of Petroleum - Beijing
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2014
In order to identify the internal percolation differences of sand-gravel braided river under the control of the lithofacies association and architecture unit, this study used the lithofacies association and hierarchical bounding surfaces, and took the porosity permeability data and statistical material of samples into consideration, and then analyzed the lithofacies association, architecture bounding surface and architecture unit of Heiyoushan 35 outcrop section. And also, the study proposed the percolation difference styles under the control of the lithofacies association and architecture unit. The results show that different styles of percolation geological characteristics are controlled by different lithofacies association and architecture unit, which are caused by different accretion styles and infilling patterns of channel deposits. In the process of channel lateral migration and accretion, one sequence, which passes from conglomerate-coarse sandstone facies laterally or upwardly to horizontal bedding argillaceous siltstone facies, is formed, leading to the permeability lateral uniformed distribution and decreasing upward. However, in the process of sandy channel filling, another sequence, which passes from large tabular cross bedding conglomerate coarse sandstone facies to horizontal bedding argillaceous siltstone, is formed, leading to a homogeneous style of permeability which unobvious reduces towards the channel edge and bottom. Nevertheless, in the process of sandy-gravel channel filling, the third sequence is proposed, which passes from large tabular cross bedding fine conglomerate facies to coarse sandstone facies to horizontal bedding argillaceous siltstone facies, and the permeability decreases from center to all around.
Yang H.,Xinjiang Oilfield Company
Drilling Fluid and Completion Fluid | Year: 2010
In this paper, the so called Ultimate Depth of foam drilling was defined. Based on some sticking cases of foam drilling in Xinjiang oilfield and the mechanism of carrying and suspending cuttings by foam, the existence of Ultimate Depth was demonstrated. The result shows that the performance of carrying cuttings should be evaluated while the depth is more than 4,000 m, and some measures of improving carrying performance should be taken.
Yang H.,Xinjiang Oil Field Company
Drilling Fluid and Completion Fluid | Year: 2010
The bottom-hole pressure of underbalanced drilling (UBD) is restricted between formation pore pressure and formation collapse pressure, which is in condition to satisfy control and disposal capability of operational equipments. As for oil & gas reservoirs with higher stress sensitivity, the bottom-hole pressure must avoid the reservoir occurring stress sensitivity damage. We analyze the formation stress condition with the elastic mechanics, then introduce a new variable, rock damage ratio, and establish the mathematical model between reservoir permeability and rock damage ratio by the core flooding test. According to experiences and experiment data, the critical rock damage ratio is confirmed. Then, the bottom-hole pressure avoiding the reservoir stress sensitivity damage is obtained. The veracity of the design method is validated by simulation of case history (Hu-3 well).
Yu X.,Lanzhou University of Technology |
Xia X.,Xinjiang Oilfield Company |
Chen X.,Lanzhou University of Technology
Proceedings - 2011 10th IEEE/ACIS International Conference on Computer and Information Science, ICIS 2011 | Year: 2011
Telemedicine can be defined as the delivery of health care and sharing of medical knowledge over a distance using telecommunication. This paper introduced the new technology of RuBee, RuBee fills the drawback of RFID tags which have no network and cannot be programmable, which has made tremendous progress for the development of the telemedicine. A brief introduction of the RuBee protocol, and analyzed the design of RuBee Router and its application in the Telemedicine System. Provide a snapshot of the applications of electronic patient record, emergency telemedicine and home monitoring etc. in wireless telemedicine systems. © 2011 IEEE.