天然气勘探与开发2024，Vol.47Issue(1)：55-62,8.DOI:10.12055/gaskk.issn.1673-3177.2024.01.007
四川盆地简阳—三台火山岩气藏出砂原因分析及防砂措施探索
Causes and control measures for sand production in volcanic gas reservoirs,Jianyang-Santai area,Sichuan Basin
戴强 1吴军 1罗磊 2邹波1
作者信息
- 1. 中国石油川庆钻探工程有限公司钻采工程技术研究院 四川成都 610052
- 2. 中国石油西南油气田公司勘探事业部 四川成都 610041
- 折叠
摘要
Abstract
There exists sand production during the drainage of volcanic gas reservoirs in Jianyang-Santai area,Sichuan Basin,causing testing-string blockage.It is necessary to probe some appropriate measures against this sand production.Thus,not only reservoir char-acteristics but single-well sand production were analyzed to find out sand-production causes.And then,borrowed the method to predict this production in unconsolidated sandstone formations,the possibility of sand production was discussed for volcanic gas wells.Final-ly,a technical parameter of oil-pressure control during this drainage was optimized and tested on site to evaluate measure availability.Results show that(i)there is rich clay mineral in rocks with weak cementation,low intensity,and underdeveloped fractures.And the bottomhole flowing-pressure difference during the drainage is too high or higher than the critical production-pressure difference of sand production,which may induce formation collapse and thus sand production;(ii)two methods of both log-based interval travel-time and combined modulus can qualitatively predict the probability of sand production in Jianyang-Santai volcanic gas reservoirs,and the other drag and empirical model formulas can also easily calculate the critical difference in various formation-testing intervals;and(iii)in-situ practice demonstrates that,being a main measure against sand production during oil testing of exploratory wells in Jianyang-Santai volcanic gas reservoirs,the approach of step-by-step constant-pressure-difference managed bleeding can mitigate sand-production risks with effect.关键词
四川盆地/简阳—三台火山岩气藏/火山碎屑熔岩/地层出砂/油压控制/中—晚二叠世Key words
Sichuan Basin/Volcanic gas reservoirs in Jianyang-Santai area/Pyroclastic lava/Sand production/Oil-pressure control/Middle-late Permian引用本文复制引用
戴强,吴军,罗磊,邹波..四川盆地简阳—三台火山岩气藏出砂原因分析及防砂措施探索[J].天然气勘探与开发,2024,47(1):55-62,8.
