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Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The hydraulic properties and oil displacement properties o£ ultra-high molecular weight copolymer (HMWP) formed by the AMPS monomer and ultra-high molecular weight conjugated polymer (AP-P5) formed by the conjugate monomer were studied. しaboratory experiments showed that the introduction of AMPS monomer and conjugate monomer could significantly improve the viscosity and viscoelastic properties of polymer. At a concentration of 2 000 mg/L, the viscosity of AP-P5 and HMWP increased by 25〇. 〇% and 85. 1%, the viscoelastic composite modulus increased by 36. 7% and 34.3%, respectively, and the 60 d viscosity retention rate were 6〇. 9% and 82.6%, respectively, relative to the conventional polymer. Static adsorption experiments showed that when the concentration of HMWP exceeded 200 mg/L, the adsorption capacity reached balance, while that of AP-P5 increased with the increase of the eoneentration. The results of oil displacement experiments showed that the recovery improvement of AP-P5 and HM. WP was 11. 〇% and 15. 7%, respectively. Therefore, the introduction of AMPS monomer is more eondueive to the improvement of polymer flooding effect in the high-temperature and high-salt reservoirs. Field tests showed that the effect of decreasing produced water and increasing oil was remarkable for HMWP, which can provide a technical support for greatly improving oil recovery in the high temperature and high salt reservoirs in Shengli oilfield. [ABSTRACT FROM AUTHOR]

After years of water injection development, the Jidong Oilfield has entered a stage of ultra-high water content, with problems such as increased water injection pressure and poor development effectiveness. In response to this issue, The target rock core to analyze the content and particle size distribution of clay minerals, and combines two-dimensional nuclear magnetic resonance technology were used to conduct high magnification water washing experiments to study the changes in reservoir physical properties and their causes. The experimental results show that core 8-2 and core 16-1 are defined as medium sandy fine sandstone and medium sandy fine sandstone with silt, respectively, with clay mineral content of 2. 41% and 2. 57% . As the water injection ratio increases, the nuclear magnetic porosity exhibits a pattern of first decreasing and then increasing; With the increase of water injection ratio, the permeability (water) fluctuates, with a large decrease in the early stage and a brief increase in the later stage before continuing to decrease. The damage during the water injection process mainly occurs in medium and large pores, and the degree of damage to core 8-2 is greater than that to core 16-1. The signal variation pattern of free water in the 2D nuclear magnetic spectrum of rock core is consistent with the signal intensity variation pattern of medium and large pores in the T2 nuclear magnetic spectrum. Research suggests that during the water injection process, particles and clay minerals in the cement are easily washed away and transported to the pore throat, causing blockage and causing certain damage to the pore throat, leading to a decrease in permeability (water) . Therefore, water injection wells face difficulties in water injection and an increase in water injection pressure, which affects the development effect of the oilfield. [ABSTRACT FROM AUTHOR]

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The proppant placement rule in complex fractures is relatively complex. At present, most of the research are based on numerical simulation methods, which are time-consuming and laborious. The numerical simulation method was used to study the influence of injection rate, fluid viscosity, sand ratio, particle size and density on the placement effect. And on this basis, the neural network prediction model of effective proppant support area in fractures was established by using neural network and experimental data. The results show that there are different reasonable ranges in these factors, and exceeding this range can lead to poor laying effect. The variation laws in different levels of cracks are different, and the proppant laying of the main and secondary joints are mutually affected. After the height of the sand embankment of the main joint before branching exceeds a certain height, the higher the sand embankment height, the smaller the sand embankment area of the secondary joint is,and the maximum sand embankment area of the main and secondary joints appear at different times. There is 3. 42% ~ 6. 46% error between the numerical calculation result and the model prediction result which is obtained from the prediction model of effective support area in cracks based on back propagation (BP) neural network. The area of sand dike formed after proppant migration in the fractures is predicted accurately and quickly. The research is of great significance to the fracturing development of unconventional resources. [ABSTRACT FROM AUTHOR]

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Oilfield Development in Daqing is the property of Editorial Department of Petroleum Geology & Oilfield Development in Daqing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective The safe and efficient of hydrogen storage is of great significance to the development of clean energy industrialization. Aquifer, which is widely distributed and has huge storage potential, is a potential body for safe and efficient underground storage of hydrogen. The feasibility of hydrogen storage in underground aquifers is analyzed. Methods By investigating domestic and foreign literature on hydrogen storage of aquifer, on the basis of clarifying the influence of hydrogen physical and chemical properties on aquifers, the existing cases of underground hydrogen storage are analyzed, and the influences of various factors on hydrogen storage of aquifer are explored. Results The sandstone with low carbonate and sulfate cement content and the geological conditions with no calcite in the cap rock are more suitable for underground hydrogen storage, and it is advantageous to store hydrogen in the reservoir rich in clay minerals; The influence of microorganisms should be considered for underground hydrogen storage; Both carbon dioxide and nitrogen can be used as cushion gases. At the moment when China is making a major strategic decision on the "dual carbon" goal, the research on carbon dioxide as a cushion gas should be emphasized. Conclusions At present, there are no examples of pure hydrogen storage in underground aquifers, but the related numerical simulation researches and influence factors analysis demonstrate the feasibility of hydrogen storage in aquifers. [ABSTRACT FROM AUTHOR]

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Oilfield Development in Daqing is the property of Editorial Department of Petroleum Geology & Oilfield Development in Daqing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of China University of Petroleum is the property of China University of Petroleum and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Petroleum Geology & Recovery Efficiency is the property of Petroleum Geology & Recovery Efficiency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)