Field Application

EOR technology by dry gas injection after plugging removing by CO2 huff and puff: A case study of condensate gas reservoir in a block of Zhongyuan Oilfield

  • Xue YANG
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  • Research Institute of Exploration and Development, Sinopec Zhongyuan Oilfield Company, Puyang, Henan 457000, China

Received date: 2019-02-01

  Online published: 2020-07-03

Abstract

In order to further study the EOR effect of condensate gas reservoir in Zhongyuan Oilfield, the lower third member of Shahejie Formation of a block is taken as an example. Based on the theoretical support of material balance equation and state equation, laboratory experiments such as PVT phase state and physical simulation are carried out to reveal the development rule and deeply analyze the reasons of low production, even no production, of this gas reservoir, so as to recognizes the current situation. For the first time, a two-way EOR method by dry gas injection with pressure maintaining after plugging removing near wellbore area conforming to the geological characteristics of the condensate gas reservoir in this block is proposed. Physical simulation experiments of plugging removing by CO2 flooding for natural cores at injection end and extraction end are conducted respectively. The corresponding permeability after plugging removing is 60.44 % and 63.15 %, showing that the effect of plugging removing by CO2 injection is good. On this basis, experiment of core displacement with dry gas injection is conducted with the result that at the beginning, dry gas injection with pressure maintaining under the original formation pressure of 41.19 MPa for condensate gas reservoir can make the condensate oil recovery ratio up to 91.41 %; when the pressure decline to the plugging pressure of 21.14 MPa, using this method again, the recovery ratio can be 44.28 %. By the researches, the formation physical model of oil-water emulsification plugging, because that the near wellbore area pressure is lower than the dew point pressure in the development process, is further clarified, providing technical support for the benefit development of low permeability tight condensate gas reservoir in Zhongyuan Oilfield.

Cite this article

Xue YANG . EOR technology by dry gas injection after plugging removing by CO2 huff and puff: A case study of condensate gas reservoir in a block of Zhongyuan Oilfield[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(3) : 75 -79 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.03.011

References

[1] 马清杰, 闫娥, 蒲万芬, 等. 塔河托甫台区块注天然气与CO2提高采收率实验研究[J]. 科学技术与工程, 2017,17(8):14-20.
[1] MA Q J, YAN E, PU W F, et al. Experimental study on the natural gas and CO2 injection EOR processes in Tuofutai Block of Tahe Oilfield[J]. Science Technology and Engineering, 2017,17(8):14-20.
[2] 李士伦, 郭平, 王仲林, 等. 中低渗透油藏注气提高采收率理论及应用[M]. 北京: 石油工业出版社, 2007.
[2] LI S L, GUO P, WANG Z L, et al. Theory and application of gas injection and improved oil recovery in medium and low permeability reservoir[M]. Beijing: Petroleum Industry Press, 2007.
[3] 曾贤辉, 彭鹏商, 王进安, 等. 文72块沙三中油藏烃气驱室内实验[J]. 新疆石油地质, 2003,24(2):161-163.
[3] ZENG X H, PENG P S, WANG J A, et al. Lab test of hydrocarbon gas injection in middle Sba-3 Reservoir of Block Wen-72[J]. Xinjiang Petroleum Geology, 2003,24(2):161-163.
[4] 王进安, 袁广均, 张军, 等. 长岩心注二氧化碳驱油物理模拟实验研究[J]. 特种油气藏, 2001,8(2):75-78.
[4] WANG J A, YUAN G J, ZHANG J, et al. Experimental study on physical modelling of crude displacement with carbon dioxide drive for long core[J]. Special Oil & Gas Reservoirs, 2001,8(2):75-78.
[5] 李士伦, 张正卿, 冉新权, 等. 注气提高石油采收率技术[M]. 成都: 四川科学技术出版社, 2001: 96-102.
[5] LI S L, ZHANG Z Q, RAN X Q, et al. Gas injection technology for EOR[M]. Chengdu: Sichuan Science & Technology Publishing House, 2001.
[6] 舒梅. 白庙凝析气井反凝析伤害机理及CO2吞吐解除反凝析伤害的方法研究[D]. 成都:西南石油大学, 2001.
[6] SHU M. A study on mechanism of condensate injury and its removal method by CO2 for condensate gas wells in Baimiao[D]. Chengdu: Southwest Petroleum University, 2001.
[7] KOOTTUNGAL L. 2010 worldwide EOR survey[J]. Oil & Gas Journal, 2010,108(14):41-53.
[8] GREEN D W, WILLITS G P. Enhanced oil recovery[M]. Texas: Society of Petroleum Engineers, 1998.
[9] 田巍. 致密砂岩凝析气藏油气水多相渗流规律研究[D]. 北京:北京科技大学, 2015.
[9] TIAN W. Study on multiphase seepage of oil and gas in condensate gas reservoir of dense sandstone[D]. Beijing: University of Science and Technology Beijing, 2015.
[10] 高奕奕, 孙雷, 张庆生, 等. 低渗凝析气井反凝析、反渗吸伤害及解除方法[J]. 西南石油大学学报(自然科学版), 2005,27(2):45-49.
[10] GAO Y Y, SUN L, ZHANG Q S, et al. Retrograde condensate, reverse imbibition damage and removing methods for low permeability condensate gas wells[J]. Journal of Southwest Petroleum Institute, 2005,27(2):45-49.
[11] 胡雪涛. 油层物理[M]. 北京: 石油工业出版社, 2013: 275-278.
[11] HU X T. Physical of Petroleum Reservoir[M]. Beijing: Petroleum Industry Press, 2013: 275-278.
[12] 李雷寿. 近井带反凝析污染解决方法的研究[D]. 大庆:东北石油大学, 2011: 13-14.
[12] LI L S. Study on solution of anti-condensation pollution in near well belt[D]. Daqing: Northeastern Petroleum University, 2011.
[13] 高奕奕. 注气吞吐解除凝析气井近井地层反凝析、反渗吸堵塞机理及应用研究[D]. 成都:西南石油大学, 2004.
[13] GAO Y Y. Mechanism and application of anti-condensation and anti-osmosis blocking released by gas injection-huff and puff in near-well formation of gas-condensate wells[D]. Chengdu: Southwest Petroleum University, 2004.
[14] 周小平. 低渗凝析气井反凝析及水锁伤害机理和解除方法研究[D]. 成都:西南石油大学, 2006: 8-66.
[14] ZHOU X P. Study on mechanism of reverse condensate and water lock damage of low permeability condensate gas wells[D]. Chengdu: Southwest Petroleum University, 2006.
[15] 戴岑璞, 王自明. 低渗透凝析气藏的反凝析特征[J]. 天然气工业, 2007,27(11):79-81.
[15] DAI C P, WANG Z M. Retrograde condensation behaviors in low-permeability gas condensate reservoirs[J]. Natural Gas Industry, 2007,27(11):79-81.
[16] 袁士义, 叶继根, 孙志道. 凝析气藏高效开发理论与实践[M]. 北京: 石油工业出版社, 2003.
[16] YUAN S Y, YE J G, SUN Z D. Theory and practice of efficient development of condensate gas reservoir[M]. Beijing: Petroleum Industry Press, 2003.
[17] 彭松. 致密砂岩凝析气藏反凝析伤害机理及合理开发方式研究[D]. 成都:西南石油大学, 2015.
[17] PENG S. Study on mechanism of anti-condensation damage in condensate gas reservoir of dense sandstone[D]. Chengdu: Southwest Petroleum University, 2015.
[18] 李仕伦, 孙雷, 杜建芬, 等. 低渗致密气藏、凝析气藏开发难点与对策[J]. 新疆石油地质, 2004,25(2):156-159.
[18] LI S L, SUN L, DU J F, et al. Difficulties and measures for development of low permeability tight gas reservoirs and condensate gas reservoirs[J]. Xinjiang Petroleum Geology, 2004,25(2):156-159.
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