Distribution and Potential Tapping Strategies of Remaining Gas in Tight Sandstone Gas Reservoirs, Sulige Gas Field

Abstract

Abstract: The Su 36-11 block in the central area of Sulige gas field has been developed for 17 years, with high degrees of development and reserves producing. The strong reservoir heterogeneity in this block leads to uneven producing of reserves and complex distribution of remaining gas. Distribution determination and potential tapping of the remaining gas are crucial for maintaining stable production in the gas field. By accurately characterizing the reservoir architecture, the main factors influencing remaining gas distribution were identified, the distribution patterns of different types of remaining gas were determined, and corresponding strategies for recovering the remaining gas were proposed. The research results show that the gas-bearing sand bodies in the study area are mainly distributed in the 4th-order architecture units, such as channel bar and point bar, these sand bodies are significantly affected by various levels of flow barriers, with small overall scale, poor connectivity, width of 150-500 m and length of 300-800 m. The main NE-SW sand belt in the block has been developed the most, with low formation pressure, and the remaining gas is mainly distributed in the lower He 8 member in the northwestern part of the block. Remaining gas, whose distribution is mainly influenced by reservoir heterogeneity and uneven development, can be divided into five types: gas uncontrolled by well pattern, gas in composite sand body flow barrier, gas in secondary pay zone unexploited by horizontal well, gas in unperforated gas-bearing layer in vertical well, and gas unproduced. Four potential tapping measures were proposed, including well infilling, reperforation, sidetracking and potential tapping in existing wells. According to the adjusted development plan, it is predicted that stable production can be maintained for 7 years with the recovery efficiency reaching 45%.

Key words: Sulige gas field, tight sandstone, reservoir architecture, remaining gas reserves evaluation, remaining gas distribution, potential tapping, middle–late development stage, adjusted development plan

SHI Yaodong, WANG Liqiong, ZANG Yicheng, ZHANG Ji, LI Peng, LI Xu. Distribution and Potential Tapping Strategies of Remaining Gas in Tight Sandstone Gas Reservoirs, Sulige Gas Field[J]. Xinjiang Petroleum Geology, 2023, 44(zk(English)): 68-76.

References

[1] JIA Ailin,WEI Yunsheng,GUO Zhi,et al.Development status and prospect of tight sandstone gas in China[J]. Natural Gas Industry,2022,42(1):83-92.
[2] ZHANG Caili,LIU Xinshe,YANG Yajuan,et al.Petroleum exploration history and enlightenment of Changqing oilfield in Ordos basin[J]. Xinjiang Petroleum Geology,2021,42(3):253-263.
[3] HE Guanghuai,LI Jinbu,WANG Jiping,et al.New progress and outlook of development technologies in the Sulige gas field[J]. Natural Gas Industry,2011,31(2):12-16.
[4] TAN Zhongguo,LU Tao,LIU Yanxia,et al.Technical ideas of recovery enhancement in the Sulige gas field during the 13th FiveYear Plan[J]. Natural Gas Industry,2016,36(3):30-40.
[5] GUO Ping,JING Shasha,PENG Caizhen.Technology and countermeasures for gas recovery enhancement[J]. Natural Gas Industry,2014,34(2):48-55.
[6] JI Guang,JIA Ailin,MENG Dewei,et al.Technical strategies for effective development and gas recovery enhancement of a large tight gas field:A case study of Sulige gas field,Ordos basin,NW China[J]. Petroleum Exploration and Development,2019,46(3):602-612.
[7] DONG Shuo,GUO Jianlin,GUO Zhi,et al.Evaluation of remaining reserves and strategies of enhanced oil recovery for Su 6 block[J]. Fault-Block Oil & Gas Field,2020,27(1):74-79.
[8] FU Ninghai,TANG Haifa,LIU Qunming.Technologies for fine adjustment in the middle-later development stage of low permeability tight sandstone gas reservoirs[J]. Journal of Southwest Petroleum University (Science & Technology Edition),2018,40(3):136-145.
[9] HE Dongbo,JIA Ailin,JI Guang,et al.Well type and pattern optimization technology for large scale tight sand gas,Sulige gas field[J]. Petroleum Exploration and Development,2013,40(1):79-89.
[10] WANG Liqiong,WANG Zhiheng,MA Yulong,et al.Development technology and application of sidetracking horizontal wells in old wells in Sulige gas field[J]. Xinjiang Petroleum Geology,2022,43(3):368-377.
[11] WANG Jiping,REN Zhanli,SHAN Jingfu,et al.He 8 and Shan 1 members depositional system research in east of Sulige gas field[J]. Geological Science and Technology Information,2011,30(5):41-48.
[12] ZHANG Ji,MA Zhixin,WANG Wensheng,et al.Architecture unit anatomy of braided river reservoirs and distribution of effective sand bodies[J]. Special Oil & Gas Reservoirs,2017,24(2):1-5.
[13] ZHAO Zhongjun,LI Jinbu,MA Zhixin,et al.Quantitative characterization of braided river reservoir architecture units in Su 36-11 enhanced oil recovery test area[J]. Xinjiang Petroleum Geology,2017,38(1):55-61.
[14] MA Zhixin,WU Zheng,ZHANG Ji,et al.Static and dynamic information fusion based reservoir architecture characterization and 3D geological modeling technology for braided river reservoirs[J]. Natural Gas Industry,2022,42(1):146-158.
[15] JIA Yunchao,YIN Nanxin,LI Cungui,et al.Comparison and optimal analysis of reservoir modeling methods in sulige gas field:Taking Su 6 infill experimental block as an example[J]. Fault-Block Oil & Gas Field,2015,22(6):765-769.
[16] ZHU Jinli.Quantitative description of remaining gas distribution in strongly heterogeneous tight sandstone gas reservoirs and countermeasures to tap potential:Taking the northern old area of Block Su 11 in the Sulige gas field as an example[J]. Natural Gas Industry,2020,40(11):89-95.
[17] BU Tao,LI Zhongping,ZHAN Guowei,et al.Study on the types and distribution of remaining gas in low permeability sandstone gas reservoirs in the western Sichuan depression[J]. Natural Gas Industry,2003,23(Supp.):13-15.
[18] ZHANG Ji,SHI Hongran,LIU Yanxia,et al.A new method to evaluate the available reserve of tight sandstone gas reservoir with strong heterogeneity[J]. Special Oil & Gas Reservoirs,2018,25(3):1-5.
[19] HOU Kefeng,LI Jinbu,ZHANG Ji,et al.Evaluation and development countermeasures of undeveloped reserves in Sulige tight sandstone gas reservoir[J]. Lithologic Reservoirs,2020,32(4):115-125.
[20] CHENG Lihua,GUO Zhi,MENG Dewei,et al.Reserves grading classification and development countermeasures for low-permeability tight gas reservoirs in the Ordos basin[J]. Natural Gas Industry,2020,40(3):65-73.
[21] FEI Shixiang,YU Haojie,CHEN Cunliang,et al.Key technologies for horizontal well development in tight sandstone gas reservoirs:A case study of Upper Paleozoic in Sulige gas field[J]. Journal of Xi,an Shiyou University (Natural Science Edition),2022,37(4):26-35.