Abstract
In order to solve the problem of rapid decrease in oil production rate in the late stage of depletion development of tight reservoirs in the Mahu area, as well as issues such as shortage of CO2 gas source, high cost, and corrosiveness, a method of natural gas displacement is proposed to develop tight reservoirs. The mechanism, development characteristics, and influencing factors of natural gas displacement to improve tight oil recovery are discussed from the aspects of micro development mechanism and macro development effect through the experimental study of feldspar core displacement. The important operating parameters such as gas injection speed and gas injection timing are optimized. The experimental results show that the gas injection rate has a great influence on the recovery factor, and there is a gas injection rate (0.10 cm3/min). That is optimized for development efficiency. The determination of the minimum miscibility pressure of crude oil and natural gas of 44.61 MPa provides a theoretical basis for the development of a tight oil reservoir by natural gas injection. Through displacement experiments conducted under current formation pressures of 37 MPa, depleted to 31 MPa, and depleted 25 MPa, it was found that the best time for natural gas injection is under the current reservoir pressure. The results optimize the key injection parameters that can guide the field application and confirm the feasibility and potential of natural gas to enhance tight oil recovery. To provide a strong basis for field development.
Copyright 2023, IFEDC Organizing Committee.
This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20–22 September 2023.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Acknowledgments
The project is supported by National Science Fund for Excellent Young Scholars (grant no. 52222402); National Natural Science Foundation of China (grant no. 52234003); National Natural Science Foundation of China (grant no. 52074235); Sichuan Science and Technology Program (grant no. 2022JDJQ0009); Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance (no. 2020CX020202, 2020CX030202).
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Wang, Yc., Zhao, Yl., Zhang, Lh., Fan, Yt. (2024). Experimental Study on Improving Tight Oil Recovery by Injecting Natural Gas. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0264-0_25
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DOI: https://doi.org/10.1007/978-981-97-0264-0_25
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