Jiang Yun,Yang Xianyou,Li Yue,et al.Solutions for water block damage of tight gas reservoirs in Dabei-Keshen area[J].Journal of Shenzhen University Science and Engineering,2017,34(6):640-646.[doi:10.3724/SP.J.1249.2017.06640]





Solutions for water block damage of tight gas reservoirs in Dabei-Keshen area
1)中国石油勘探开发研究院, 北京 100083
2)中海石油(中国)有限公司天津分公司,天津 300459
3)中国石油西南油气田分公司川中油气矿,四川遂宁 629000
Jiang Yun1 Yang Xianyou1 Li Yue2 Shi Yang1 Xu Guoqing1 and Yu Yue3
1) Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, P.R.China
2) CNOOC(China)Co. Ltd. Tianjin Branch, Tianjin 300459, P.R.China
3) Chuanzhong Division of PetroChina Southwest Oil & Gas Field Company, Suining 629000, Sichuan Province, P.R.China
water block damage relative gas permeability water block index sensitivity analysis thermo-stable composite surfactant system cleanup of water block
TE 355
针对大北-克深区块致密砂岩储层易发生水锁伤害从而降低气井产能,研究目标区块水锁伤害机理及相应防治措施.基于气相相对渗透率建立水锁指数(water block index, WBI),分析水锁伤害程度及其影响因素,优选耐高温表面活性剂体系防治水锁伤害.结果表明,目标区块岩心水锁伤害程度属强水锁型(平均WBI为69.8%),基质渗透率、驱替压力均与 WBI呈负相关,含水饱和度、黏土矿物含量、流体黏度和表面张力均与WBI呈正相关,优选出耐温复配表面活性剂体系JY-2(由质量分数为0.05%的FC-25和质量分数为15%的甲醇组成)和JY-3(由质量分数为0.5%的HSC-25和质量分数为15%的甲醇组成),JY-3效果更好,可将目标区块岩心水锁指数 WBI从66.2%降至28.4%,达到解除水锁伤害目的.
Water block damage is likely to occur in tight gas reservoirs of Dabei-Keshen area and decreases production of gas wells. In order to investigate the mechanisms of water block and the corresponding measures, the water block index (WBI) is developed to appraise the damage degree of water block in approach of relative gas permeability, and composite surfactant system is optimized to clean up effects of water block damage through interfacial tension tests, wettability tests and spontaneous imbibition experiments. The results and conclusions are as follows: the average WBI for core samples from the targeted zone is 69.8%, belonging to the type of strong damage of water block. Sensitivity analysis shows matrix permeability and displacement pressure are in negative correlation with WBI, while water saturation, content of clays, fluid viscosity and interfacial tension are in positive correlation with WBI. In this work, thermo-stable surfactant systems JY-2(0.05% FS-31+15% methanol) and JY-3(0.5% HSC-25+15% methanol) are developed. JY-3 performs better in reducing WBI from 66.2% to less than 28.4%. Surfactants in the composite system contributes to reducing the interfacial tension and altering wettability, and methanol is beneficial to reducing water saturation through accelerating evaporation shortly. The synergy effect promotes the cleanup process of water block damage. The found mechanisms of water block damage and numerous experimental data provide us valuable insight on the economic and efficient development of gas fields.


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Foundation:National Science and Technology Major Project of China (2011ZX05046005)
Corresponding author:Professor Yang Xianyou.E-mail: yangxianyou@petrochina.com.cn
Citation:Jiang Yun, Yang Xianyou, Li Yue, et al.Solutions for water block damage of tight gas reservoirs in Dabei-Keshen area[J]. Journal of Shenzhen University Science and Engineering, 2017, 34(6): 640-646.(in Chinese)
引文:江昀,杨贤友,李越,等. 大北-克深区块致密砂岩气藏水锁伤害防治[J]. 深圳大学学报理工版,2017,34(6):640-646.
更新日期/Last Update: 2017-10-09