Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery

doi:10.3969/j.issn.1006-6535.2025.06.010

Abstract

Abstract: During test production in the Sha-1 section of the Tianfu gas field,some wells encountered water,but it remains unclear whether movable formation water is present and how it affects recovery.To address this,study was made on the fluvial channel sandstone gas reservoir of the Tianfu Sha-1 section using laboratory gas-drive-water experiments,analysis of sealed core data and CT scanning to assess reservoir water mobility and movable intervals,clarifying the occurrence state of formation water in the porous medium.We also established a high-temperature high-pressure experimental simulation of movable water′s effect on gas-water two-phase deliverability was to evaluate how movable water influenced recovery.The study showes that the water saturations of three sealed cores(X211, X206, X212)all exceeded the irreducible water saturation of the experimental cores,indicating a coexistence of gas and water in the reservoir;average movable water saturations were 21.31%,18.41% and 7.93% respectively.After gas-drive tests,gas preferentially swept large pores,while formation water mainly occupies small pores-tighter reservoirs retained more water with higher bound-water saturation.At the same decline rate,as water saturation increased,gas recovery decreased,and movable water has a greater impact on low-permeability reservoirs.These results are significant for evaluating movable water and calibrating recovery in similar gas reservoirs.

Key words: fluvial channel sandstone, tight sandstone, formation water, water saturation, recovery factor, Tianfu gas field

CLC Number:

TE343

LI Mingqiu, ZHANG Guangdong, YU Peng, WANG Huiqiang, XU Weichong, SHI Erhan, FENG Yan. Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery[J]. Special Oil & Gas Reservoirs, 2025, 32(6): 86-91.

References

[1] 位云生,邵辉,贾爱林,等.低渗透高含水饱和度砂岩气藏气水分布模式及主控因素研究[J].天然气地球科学,2009,20(5):822-826.
WEI Yunsheng,SHAO Hui,JIA Ailin,et al.Gas water distribution model and control factors in low permeability high water saturation sandstone gas reservoirs[J].Natural Gas Geoscience,2009,20(5):822-826.
[2] 叶礼友,高树生,熊伟,等.可动水饱和度作为低渗砂岩气藏储层评价参数的论证[J].石油天然气学报,2011,33(1):57-59.
YE Liyou,GAO Shusheng,XIONG Wei,et al.Demonstration of mobile water saturation as evaluation parameter of low permeability sandstone gas reservoir[J].Journal of Oil and Gas Technology,2011,33(1):57-59.
[3] ZHANG J,LI X,SHEN W,et al.Study of the effect of movable water saturation on gas production in tight sandstone gas reservoirs[J].Energies,2020,13(18):4645.
[4] JIANG Meiling,FANG Haixu,Liu Yang,et al.On movable fluid saturation of tight sandstone and main controlling factors-case study on the Fuyu oil layer in the Da′an Oilfield in the Songliao Basin[J].Energy,2023,267:126476.
[5] JESSEN K,TANG G Q,KOVSCEK A R.Laboratory and simulation investigation of enhanced coalbed methane recovery by gas injection[J].SPE Annual Technical Conference and Exhibition,2008,73(2):141-159.
[6] 王勇飞,衡勇.中江气田河道砂岩优质储层特征及主控因素[J].西南石油大学学报(自然科学版),2023,45(2):11-20.
WANG Yongfei,HENG Yong.Characteristics and main controlling factors of high quality channel sandstone reservoir in Zhongjiang Gas Field[J].Journal of Southwest Petroleum University(Science & Technology Edition),2023,45(2):11-20.
[7] 万玉金,孙贺东,黄伟岗,等.涩北气田多层气藏储量动用程度分析[J].天然气工业,2009,29(7):58-60.
WAN Yujin,SUN Hedong,HUANG Weigang,et al.Reserves producing level analysis of multilayer gas reservoir in the Sebei Gas Filed[J].Natural Gas Industry,2009,29(7):58-60.
[8] 生如岩,冯其红.有限底水驱气藏气水均衡同采的实例评价[J].天然气工业,2011,31(2):63-65.
SHENG Ruyan,FENG Qihong.Cases analysis and evaluation of gas-water proportionally simultaneous production for limited bottom water-drive gas reservoirs[J].Natural Gas Industry,2011,31(2):63-65.
[9] 肖鹏,刘洪,于希南,等.水驱气藏采收率计算及影响因素分析[J].重庆科技学院学报(自然科学版),2013,15(1):116-119.
XIAO Peng,LIU Hong,YU Xi′nan,et al.Compution and analysis on affecting factors of recovery ratio of water-drive gas reservoir[J].Journal of Chongqing University of Science and Technology(Natural Science Edition),2013,15(1):116-119.
[10] 李奇,高树生,叶礼友,等.致密砂岩气藏渗流机理及开发技术[J].科学技术与工程,2014,14(34):79-87.
LI Qi,GAO Shusheng,YE Liyou,et al.The research of percolation mechanism and technical countermeasures of tight sandstone gas reservoirs[J].Science Technology and Engineering,2014,14(34):79-87.
[11] 胡勇,李熙喆,李跃刚,等.低渗致密砂岩气藏提高采收率实验研究[J].天然气地球科学,2015,26(11):2142-2148.
HU Yong,LI Xizhe,LI Yuegang,et al.Enhanced gas recovery of the low permeability and tight sandstone gas reservoir[J].Natural Gas Geoscience,2015,26(11):2142-2148.
[12] 张国龙,何志强,朱建钧,等.凝析气藏衰竭式开发影响因素实验[J].大庆石油地质与开发,2016,35(1):62-65.
ZHANG Guolong,HE Zhiqiang,ZHU Jianjun,et al.Experiments on influence factors of condensate gas reservoirs depletion development[J].Petroleum Geology & Oilfield Development in Daqing,2016,35(1):62-65.
[13] WANG Fengjiao,LIU Yikun,HU Chaoyang,et al.Experimental study on feasibility of enhanced gas recovery through CO₂ flooding in tight sandstone gas reservoirs[J].Processes,2018,6(11):214.
[14] 朱文卿,高树生,沈杰,等.致密砂岩气藏气水层识别新方法——以苏76井区为例[J].天然气地球科学,2019,30(11):1629-1638.
ZHU Wenqing,GAO Shusheng,SHEN Jie,et al.A new method for identifying gas-water layer in tight sandstone gas reservoirs:case study of Su76 well area[J].Natural Gas Geoscience,2019,30(11):1629-1638.
[15] 张刚,温佳霖,韩迎鸽,等.特低渗透油藏产量变化规律及影响因素分析——以鄂尔多斯盆地定1780长1油藏为例[J].非常规油气,2020,7(1):50-58.
ZHANG Gang,WEN Jialin,HAN Yingge,et al.Analysis of production change rule and influence factors for ultra-low permeability-a case study of Chang-1 Reservoir in Ding 1780 Block, Ordos Basin[J].Unconventional Oil & Gas,2020,7(1):50-58.
[16] 王雯娟,鲁瑞彬,雷霄,等.高温高压低渗气藏可动水饱和度及水气比定量评价方法[J].中国海上油气,2022,34(3):91-97.
WANG Wenjuan,LU Ruibin,LEI Xiao,et al.Quantitative evaluation method of movable water saturation (MWS) and water gas ratio (WGR) in high temperature high pressure (HTHP) and low permeability gas reservoirs[J].China Offshore Oil and Gas,2022,34(3):91-97.
[17] 王琴,王攀荣,张骞,等.海上低渗高含水气藏基于可动水的产能评价方法[J].长江大学学报(自然科学版),2024,21(4):95-103.
WANG Qin,WANG Panrong,ZHANG Qian,et al.A productivity evaluation method based on movable water for offshore low permeability and high water content gas reservoirs[J].Journal of Yangtze University(Natural Science Edition)2024,21(4):95-103.
[18] 付德奎.普光地区千佛崖组致密砂岩-页岩气藏开发技术对策[J].断块油气田,2024,31(1):11-17.
FU Dekui.Development technical countermeasures of tight sandstone and shale gas reservoirs in Qianfoya Formation of Puguang Area[J].Fault-Block Oil & Gas Field,2024,31(1):11-17.
[19] 赵俊威,陈恭洋,赵星,等.川西新场地区须二段致密砂岩气藏气水分布特征及主控因素[J].断块油气田,2024,31(3):379-386.
ZHAO Junwei,CHEN Gongyang,ZHAO Xing,et al.Gas-water distribution characteristics and main controlling factors of tight sandstone gas reservoir in the second Member of Xujiahe Formation in Xinchang Area, western Sichuan[J].Fault-Block Oil & Gas Field,2024,31(3):379-386.
[20] 唐友军,徐文畅,王小娟,等.川中简阳须家河组地层水化学特征和成因——来自水化学和锶同位素的证据[J].断块油气田,2024,31(3):444-452.
TANG Youjun,XU Wenchang,WANG Xiaojuan,et al.Hydrochemical characteristics and genesis of Xujiahe Formation formation water in Jianyang,central Sichuan:evidence from hydrochemistry and strontium isotope[J].Fault-Block Oil & Gas Field,2024,31(3):444-452.
[21] 邹辰,吴永辉,梁兴,等.渝西地区走滑断裂活动背景下地层水对页岩气富集的控制作用[J].大庆石油地质与开发,2023,42(3):11-19.
ZOU Chen,WU Yonghui,LIANG Xing,et al.Control effect of formation water on shale gas enrichment in the background of strike-slip fault activity in western Chongqing[J].Petroleum Geology & Oilfield Development in Daqing,2023,42(3):11-19.