The Experts below are selected from a list of 23157 Experts worldwide ranked by ideXlab platform
Jie Chen - One of the best experts on this subject based on the ideXlab platform.
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research on Gas Leakage and collapse in the cavern roof of underground natural Gas storage in thinly bedded salt rocks
Journal of energy storage, 2020Co-Authors: Wei Liu, Deyi Jiang, Zhixin Zhang, Jinyang Fan, Jie ChenAbstract:Abstract In the thinly bedded salt rocks, the roofs of salt cavern Gas storage may have different lithology, some cavern roofs of these caverns may be damaged and lose tightness. Thus it is significant to study the characteristic of the Gas Leakage through the cavern roof of the Gas storage cavern in bedded salt rocks. To approach such a goal, the Gas Leakage through a cavern roof and the induced collapse are investigated in this study. At first, the salt cavern of ZJ-block of Huai'an salt mine is selected as the potential Gas storage site, which has a roof consisting of salt rock, a thin gypsum layer, and thick argillaceous siltstone. And then, the porosity and permeability of rock samples of the roof strata are measured in the laboratory. Thirdly, a numerical simulation model is established based on the geo-conditions of the ZJ-block. The Gas seepage and cavern tightness under three different cavern roof conditions are simulated and analyzed. The results show that, if the cavern roof is integral, the main Gas seepage channels of the cavern are the interlayers, and the tightness of Gas storage salt cavern is satisfactory once the permeability of interlayers is around 10−17 m2 or lower. After the salt rock layer of the roof is damaged and a partial gypsum layer is exposed, the Gas Leakage amount can increase about one order of magnitude. But the seepage rate and pore pressure both change slowly in the roof. Thus the operators have sufficient time to survey the accidents and transfer the Gas away. However, after the thin gypsum layer is damaged and results in the exposure of argillaceous siltstone, the Gas seepage sharply increases. Including the Leakage amount, the seepage range, and the pore pressure are all increased much than that of the above two conditions. Due to the serious consequence of storage safety, this condition should be absolutely avoided. To ensure the roof safety and tightness of Gas storage, it is suggested that the reasonable construction of a cavern roof is the prerequisite, and the internal pressure monitoring, as well as sonar measuring, should be engaged regularly during the operation period.
Jun Xiong - One of the best experts on this subject based on the ideXlab platform.
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Gas Leakage mechanism in bedded salt rock storage cavern considering damaged interface
Petroleum, 2015Co-Authors: Jun Xiong, Xiaolan Huang, Hongling MaAbstract:During the long-time operation of salt rock storage cavern, between its formations, damaged interfaces induced by discontinuous creep deformations between adjacent layers will possibly lead to serious Gas Leakage. In this paper, damaged interfaces are considered as main potential Leakage path: firstly in meso-level, Gas flow rule along the interface is analyzed and the calculation of equivalent permeability is discussed. Then based on porous media seepage theory, Gas Leakage simulation model including salt rock, cavity interlayers and interface is built. With this strategy, it is possible to overcome the disadvantage of simulation burden with porous-fractured double medium. It also can provide the details of Gas flowing along the damaged zones. Finally this proposal is applied to the salt cavern in Qianjian mines (East China). Under different operation pressures, Gas distributions around two adjacent cavities are simulated; the evolvement of Gas in the interlayers and salt rock is compared. From the results it is demonstrated that the domain of creep damage area has great influence on Leakage range. And also the Leakage in the interface will accelerate the development of Leakage in salt rock. It is concluded that compared with observations, this new strategy provides closer answers. The simulation result proves its validity for the design and reasonable control of operating pressure and tightness evaluation of group bedded salt rock storage caverns.
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numerical simulation of Gas Leakage in bedded salt rock storage cavern
Procedia Engineering, 2011Co-Authors: Xiaolan Huang, Jun XiongAbstract:Abstract Storage of hydrocarbons in underground salt caverns created by solution mining has been commonly and successfully used for several years in developed country. Sealing performance is an important technique and safety index for salt rock Gas storage. Considering the unique stratigraphic characteristics of the bedded salt rocks in China, interlayer has great influence on the tightness of salt carven. It is likely that stored natural Gas will escape along the interface of interlayer. It is the key problem to establish the permeability model and to provide corresponding numerical simulation which is suitable for bedded salt rock. In the paper, based on seepage theory in porous media, evolvement equation of Gas permeability is established. The salt cavern in Jintan salt mines is taken as engineering background; during the operating period, the pressure distribution and Gas leak distance at interface and layers with different operating pressures are studied. It is demonstrated that the Gas infiltration velocity along the damaged interface is much faster than the salt rock and mudstone interlayer, and damaged interface is the main Gas Leakage path. Moreover, with the bigger operation pressure, natural Gas spreads much faster at the beginning years. The simulation results prove scientific basis for the design and reasonable control of operating pressure and tightness evaluation of bedded salt rock storage cavern.
J E Houseworth - One of the best experts on this subject based on the ideXlab platform.
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comment on potential for environmental impact due to acid Gas Leakage from wellbores at eor injection sites near zama lake alberta by d m leneveu 2012
Greenhouse Gases-Science and Technology, 2012Co-Authors: J E HouseworthAbstract:Comment on “Potential for environmental impact due to acid Gas Leakage from wellbores at EOR injection sites near Zama Lake, Alberta”, by D.M. LeNeveu (2012) James E. Houseworth Preston D. Jordan Earth Sciences Division Lawrence Berkeley National Laboratory Berkeley, CA 94720 USA Abstract This comment concerns the potential hazards identified by LeNeveu 1 concerning acid Gas injection at the Zama Lake oil and Gas field in northwestern Alberta. Acid Gas is injected both as an enhanced oil recovery method and for geologic disposal. The results found by LeNeveu 1 suggest a high likelihood for serious and widespread release of H 2 S by Leakage through wellbores. We critically examine LeNeveu’s 1 assumptions regarding well Leakage response, wellbore seal degradation, and wellbore permeability, and identify more realistic and defensible assumptions. Utilizing these more credible assumptions leads to expectations for greater atmospheric dispersal and reduced acid Gas Leakage rates as compared to the findings by LeNeveu 1 . 1. Introduction The paper by LeNeveu 1 addresses potential hazards associated with the use of acid-Gas injection for enhanced oil recovery (EOR) coupled with geologic disposal of the acid Gas at the Zama Lake oil and Gas field in northwestern Alberta. The paper is useful in that it motivates further consideration of and planning for the possibility of acid-Gas Leakage via wells long after field operations have ceased. With injected acid Gas at Zama Lake composed of 70% CO 2 and 30%
D M Leneveu - One of the best experts on this subject based on the ideXlab platform.
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potential for environmental impact due to acid Gas Leakage from wellbores at eor injection sites near zama lake alberta
Greenhouse Gases-Science and Technology, 2012Co-Authors: D M LeneveuAbstract:The potential for environmental impact from future Leakage of toxic hydrogen sulfide (H2S) at an enhanced oil recovery (EOR) and acid Gas sequestration site near Zama Lake, Alberta, is examined. Over 800 pinnacle reefs are potentially suitable for EOR by injection of acid Gas. Leakage rate as a function of time through a reference wellbore is determined for various scenarios including Leakage through the annulus of the wellbore and Leakage through the central plug seal of the wellbore with an intact and failed wellbore casing. Potential plumes of H2S in the air and in shallow aquifers emanating from a single reference wellbore and from 350 wellbores are modeled. Leakage rates from the 350 wellbores are calculated from randomly sampled wellbore seal failure times, reservoir permeability, and initial amounts of acid Gas, and from reference values of other reservoir parameters. Results indicate that for hundreds of years after injection, the entire Zama Lake area of 12 000 km2 could have lethal concentrations of H2S over each of the leaking wellbores. The shallow aquifers over the entire Zama area and over 30 kilometres in the direction of aquifer flow could be undesirably tainted with dissolved H2S. The entire Zama Lake area and hundreds of kilometres beyond could become uninhabitable for more than 1000 years after injection due to toxic plumes of H2S in the air and in shallow aquifers. This analysis has implications for the potential use of acid Gas for EOR and for subsurface sequestration in general in areas with large numbers of abandoned wells. © 2012 Society of Chemical Industry and John Wiley & Sons, Ltd
Wei Liu - One of the best experts on this subject based on the ideXlab platform.
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research on Gas Leakage and collapse in the cavern roof of underground natural Gas storage in thinly bedded salt rocks
Journal of energy storage, 2020Co-Authors: Wei Liu, Deyi Jiang, Zhixin Zhang, Jinyang Fan, Jie ChenAbstract:Abstract In the thinly bedded salt rocks, the roofs of salt cavern Gas storage may have different lithology, some cavern roofs of these caverns may be damaged and lose tightness. Thus it is significant to study the characteristic of the Gas Leakage through the cavern roof of the Gas storage cavern in bedded salt rocks. To approach such a goal, the Gas Leakage through a cavern roof and the induced collapse are investigated in this study. At first, the salt cavern of ZJ-block of Huai'an salt mine is selected as the potential Gas storage site, which has a roof consisting of salt rock, a thin gypsum layer, and thick argillaceous siltstone. And then, the porosity and permeability of rock samples of the roof strata are measured in the laboratory. Thirdly, a numerical simulation model is established based on the geo-conditions of the ZJ-block. The Gas seepage and cavern tightness under three different cavern roof conditions are simulated and analyzed. The results show that, if the cavern roof is integral, the main Gas seepage channels of the cavern are the interlayers, and the tightness of Gas storage salt cavern is satisfactory once the permeability of interlayers is around 10−17 m2 or lower. After the salt rock layer of the roof is damaged and a partial gypsum layer is exposed, the Gas Leakage amount can increase about one order of magnitude. But the seepage rate and pore pressure both change slowly in the roof. Thus the operators have sufficient time to survey the accidents and transfer the Gas away. However, after the thin gypsum layer is damaged and results in the exposure of argillaceous siltstone, the Gas seepage sharply increases. Including the Leakage amount, the seepage range, and the pore pressure are all increased much than that of the above two conditions. Due to the serious consequence of storage safety, this condition should be absolutely avoided. To ensure the roof safety and tightness of Gas storage, it is suggested that the reasonable construction of a cavern roof is the prerequisite, and the internal pressure monitoring, as well as sonar measuring, should be engaged regularly during the operation period.
