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Reservoirs at Zichang Eastern Mountain2 gas sub-layer in Yanchang gas field is developed well, whose sand body distributes to a large area, and contiguous is better, while, the reservoirs of that have the features of "three low and one big" (low porosity and low permeability, low pressure, big heterogeneity), and contain high salinity formation water, whose underground geological conditions are complex, a number of factors affecting the reservoir capacity. Appling gray correlation analysis methods, the main controlling factors to influence the capacity of Shan 2 gas reservoir at the Zichang Eastern Mountain have been determined., which proposes a guidance for the next step of formation selection for fracturing and gas test and fracturing transformation technology. Source

Wang X.,Shaanxi Yanchang Petroleum Group Co. | Wu J.,Research Institute of Shaanxi Yanchang Petroleum Group | Zhang J.,Research Institute of Shaanxi Yanchang Petroleum Group
Natural Gas Industry | Year: 2014

China boasts of abundant terrestrial shale gas resources. Compared with marine shale, terrestrial shale has smaller thickness, lower content of brittle minerals, higher content of clay minerals, and lower pressure. Hence, the development technology for marine shale gas, especially the fracturing technology, is not entirely applicable to terrestrial shale. To this end, aimed at the reservoir characteristics and fracturing difficulties, the features of liquid CO2 foam and CO2 energized fracturing technology were analyzed, and their application tests were carried out in the gas shale in the Chang-7 Member of Mesozoic Yangchang Fm in the Ordos Basin. The application results showed that pure liquid CO2 at a discharge rate of 2.0 m3/min was capable of fracturing shale gas reservoirs in Chang-7 Member with a rapid liquid unloading, and ignition could be conducted after 24 h. Meanwhile, CO2 energized fracturing greatly improved the fracturing fluid flowback speed and rate to shorten the liquid unloading period, which all benefited the terrestrial shale gas exploration and development. Moreover, based on the analysis of the state-of-the-art of fracturing technologies and facilities in China, the application prospect and development idea were presented of the CO2 fracturing technology applied in terrestrial shale gas development. Source

Younian Y.,Shaanxi Yanchang Petroleum Group Co.
Petroleum Refinery Engineering | Year: 2014

The waste heat recovery process, technical features, commercial applications, energy savings and return of capital investment of four power generation projects using recovered waste heat of Yulin Refinery of Shaanxi Yanchang Petroleum (Group) Co., Ltd. are introduced. The flare flue gas which was vented after combustion in the past years is recovered and desulfurized, and is then sent to two 2 × 75 t/h steam boilers and one 35 t/h steam boiler for steam generation. The steam is fed to two 10 MW waste heat power stations and one 3 MW + 6 MW power station so as to recover the waste heat from medium - pressure and low-pressure steams of the refinery; The "3-component flue gas expander train" with 5. 35 MW main air blower is operated to recover the waste heat from regenerator' s high-temperature flue gas of a 600,000 TPY FCCU; A "4-component flue gas expander train" with 31. 5 MW main air blower is installed to recover the waste heat from the high-temperature flue gas from FCCU regenerator and from medium-pressure steam. A complete waster heat recovery process has been developed and utilized to recover the waste heat from HT flue gas, steam and flare gas for power generation. The annual saving from electricity is about 177 million Yuan (RMB). Source

Li J.,Shaanxi Yanchang Petroleum Group Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2016

There is a serious abnormal phenomena (weak reaction) in 200 kt/a polypropylene unit of Yan'an petrochemical plant. The influencing factors, including catalyst, hydrogen source, propylene tail gas recovery system, deactivation system, propylene feedstock, and so on, are analyzed. It is confirmed that relatively higher content of water and CO in propylene feedstock is attributed to the weak reaction phenomena. By strengthening the regeneration of molecular sieve and adjusting the operation of dethanizing column and stripping column, the contents of water and CO in propylene feedstock all can reach the requirements of index. The polymerization reaction is gradually improved and the device is returned to normal conditions. © 2016, China National Chemical Information Center. All right reserved. Source

Xiao J.,CAS Dalian Institute of Chemical Physics | Pan X.,CAS Dalian Institute of Chemical Physics | Guo S.,CAS Dalian Institute of Chemical Physics | Guo S.,Shaanxi Yanchang Petroleum Group Co. | And 2 more authors.
Journal of the American Chemical Society | Year: 2015

An increasing number of experimental studies have demonstrated that metal or metal oxide nanoparticles confined inside carbon nanotubes (CNTs) exhibit different catalytic activities with respect to the same metals deposited on the CNT exterior walls, with some reactions enhanced and others hindered. In this article, we describe the concept of confinement energy, which enables prediction of confinement effects on catalytic activities in different reactions. Combining density functional theory calculations and experiments by taking typical transition metals such as Fe, FeCo, RhMn, and Ru as models, we observed stronger strains and deformations within the CNT channels due to different electronic structures and spatial confinement. This leads to downshifted d-band states, and consequently the adsorption of molecules such as CO, N2, and O2 is weakened. Thus, the confined space of CNTs provides essentially a unique microenvironment due to the electronic effects, which shifts the volcano curve of the catalytic activities toward the metals with higher binding energies. The extent of the shift depends on the specific metals and the CNT diameters. This concept generalizes the diverse effects observed in experiments for different reactions, and it is anticipated to be applicable to an even broader range of reactions other than redox of metal species, CO hydrogenation, ammonia synthesis and decomposition discussed here. © 2014 American Chemical Society. Source

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