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

doi:10.7657/XJPG20230506

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 exsisting 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

CLC Number:

TE122

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[J]. Xinjiang Petroleum Geology, 2023, 44(5): 554-561.

Figures/Tables 6

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Table 1.

Table 2.

References 21

[1]	贾爱林, 位云生, 郭智, 等. 中国致密砂岩气开发现状与前景展望[J]. 天然气工业, 2022, 42(1):83-92.
	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]	张才利, 刘新社, 杨亚娟, 等. 鄂尔多斯盆地长庆油田油气勘探历程与启示[J]. 新疆石油地质, 2021, 42(3):253-263.
	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]	何光怀, 李进步, 王继平, 等. 苏里格气田开发技术新进展及展望[J]. 天然气工业, 2011, 31(2):12-16.
	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]	谭中国, 卢涛, 刘艳侠, 等. 苏里格气田“十三五”期间提高采收率技术思路[J]. 天然气工业, 2016, 36(3):30-40.
	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]	郭平, 景莎莎, 彭彩珍. 气藏提高采收率技术及其对策[J]. 天然气工业, 2014, 34(2):48-55.
	GUO Ping, JING Shasha, PENG Caizhen. Technology and countermeasures for gas recovery enhancement[J]. Natural Gas Industry, 2014, 34(2):48-55.
[6]	冀光, 贾爱林, 孟德伟, 等. 大型致密砂岩气田有效开发与提高采收率技术对策:以鄂尔多斯盆地苏里格气田为例[J]. 石油勘探与开发, 2019, 46(3):602-612. doi: 10.11698/PED.2019.03.19
	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]	董硕, 郭建林, 郭智, 等. 苏6区块气藏剩余储量评价及提高采收率对策[J]. 断块油气田, 2020, 27(1):74-79.
	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]	付宁海, 唐海发, 刘群明. 低渗致密砂岩气藏开发中后期精细调整技术[J]. 西南石油大学学报(自然科学版), 2018, 40(3):136-145.
	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]	何东博, 贾爱林, 冀光, 等. 苏里格大型致密砂岩气田开发井型井网技术[J]. 石油勘探与开发, 2013, 40(1):79-89.
	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]	王丽琼, 王志恒, 马羽龙, 等. 苏里格气田老井侧钻水平井开发技术与应用[J]. 新疆石油地质, 2022, 43(3):368-377.
	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]	王继平, 任战利, 单敬福, 等. 苏里格气田东区盒8段和山1段沉积体系研究[J]. 地质科技情报, 2011, 30(5):41-48.
	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]	张吉, 马志欣, 王文胜, 等. 辫状河储层构型单元解剖及有效砂体分布规律[J]. 特种油气藏, 2017, 24(2):1-5.
	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]	赵忠军, 李进步, 马志欣, 等. 苏36-11提高采收率试验区辫状河储集层构型单元定量表征[J]. 新疆石油地质, 2017, 38(1):55-61.
	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]	马志欣, 吴正, 张吉, 等. 基于动静态信息融合的辫状河储层构型表征及地质建模技术[J]. 天然气工业, 2022, 42(1):146-158.
	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]	贾云超, 尹楠鑫, 李存贵, 等. 苏里格气田储层建模方法对比优选分析:以苏6加密实验区块为例[J]. 断块油气田, 2015, 22(6):765-769.
	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]	祝金利. 强非均质致密砂岩气藏剩余气分布定量描述与挖潜对策:以苏里格气田苏11区块北部老区为例[J]. 天然气工业, 2020, 40(11):89-95.
	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]	卜淘, 李忠平, 詹国卫, 等. 川西坳陷低渗砂岩气藏剩余气类型及分布研究[J]. 天然气工业, 2003, 23(增刊):13-15.
	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]	张吉, 史红然, 刘艳侠, 等. 强非均质致密砂岩气藏已动用储量评价新方法[J]. 特种油气藏, 2018, 25(3):1-5.
	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]	侯科锋, 李进步, 张吉, 等. 苏里格致密砂岩气藏未动用储量评价及开发对策[J]. 岩性油气藏, 2020, 32(4):115-125.
	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]	程立华, 郭智, 孟德伟, 等. 鄂尔多斯盆地低渗透—致密气藏储量分类及开发对策[J]. 天然气工业, 2020, 40(3):65-73.
	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]	费世祥, 余浩杰, 陈存良, 等. 致密砂岩气藏水平井开发关键技术:以苏里格气田上古生界为例[J]. 西安石油大学学报(自然科学版), 2022, 37(4):26-35.
	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.

剩余气分布区域		剩余气成因类型	挖潜措施	开发条件
已开发区	井间	井网未控制孤立有效砂体	井间加密	增采气收益大于经济成本
		复合砂体阻流带	老井侧钻	增采气收益大于经济成本
		投产未采出（含水淹滞留气）	优化生产制度，排水采气，增压开采	增采气收益高于内部收益率
	层间	水平井未动用次产层	小井眼加密，老井侧钻，	增采气收益大于经济成本
	层间	直定向井未射开气层	查层补孔	增采气收益大于经济成本
未开发区		未钻井开发	优化开发井型和井网	增采气收益高于内部收益率

剩余气类型	剩余气储量占比/%	预计建井/口	井均增产气量/10⁴ m³	累计产气量/10⁸ m³	采收率/%
井网未控制型	42.6	348	2 163	107.3	13.5
复合砂体阻流带型	27.6	147	2 163	107.3	13.5
复合砂体阻流带型	27.6	65	1 908	20.8	2.6
水平井未动用次产层型	4.8	44	1 908	20.8	2.6
直定向井未射开气层型	10.3	63	535	3.4	0.5
投产未采出型	14.7			222.6	28.3
合计	100.0	667		354.1	44.9