Rock strength degradation induced by salt precipitation: A new mechanical mechanism of sand production in ultra-deep fractured tight sandstone gas reservoirs

IF 0.9 Q4 GEOSCIENCES, MULTIDISCIPLINARY AIMS Geosciences Pub Date : 2023-01-01 DOI:10.3934/geosci.2023032
Dujie Zhang, Yili Kang, Lijun You, Li Xiangchen
{"title":"Rock strength degradation induced by salt precipitation: A new mechanical mechanism of sand production in ultra-deep fractured tight sandstone gas reservoirs","authors":"Dujie Zhang, Yili Kang, Lijun You, Li Xiangchen","doi":"10.3934/geosci.2023032","DOIUrl":null,"url":null,"abstract":"<abstract> <p>I take a typical ultra-deep tight sandstone gas reservoir located in Tarim Basin as an example to investigate the rare sand production problem. The situation of sand production was presented, and then conventional analyses were conducted. Six tight sandstone core plugs were selected to conduct rock mechanical tests before and after salt precipitation. Ultimately, a mathematical model was established to investigate the mechanism of rock strength degradation. The results of sand production prediction indicated that sand production from rock skeletons should never appear, but the rock skeletons was observed in the sand samples, and thus the impact of salt precipitation was taken into account. The experiments proved salt precipitation caused a degradation in rock strength, and the difference between actual- and predicted critical sand production pressure drop based on the weakened rock strength reduced significantly. Furthermore, the stress intensity factor on the fracture tip induced by salt precipitation reached up to 1.22 MPa·m<sup>1/2</sup>, which was greater than the fracture toughness of tight sandstone, and it was used to explain the rock strength degradation. The results are helpful to the knowledge of the sand production problem in ultra-deep fractured tight sandstone gas reservoirs.</p> </abstract>","PeriodicalId":43999,"journal":{"name":"AIMS Geosciences","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"AIMS Geosciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3934/geosci.2023032","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

Abstract

I take a typical ultra-deep tight sandstone gas reservoir located in Tarim Basin as an example to investigate the rare sand production problem. The situation of sand production was presented, and then conventional analyses were conducted. Six tight sandstone core plugs were selected to conduct rock mechanical tests before and after salt precipitation. Ultimately, a mathematical model was established to investigate the mechanism of rock strength degradation. The results of sand production prediction indicated that sand production from rock skeletons should never appear, but the rock skeletons was observed in the sand samples, and thus the impact of salt precipitation was taken into account. The experiments proved salt precipitation caused a degradation in rock strength, and the difference between actual- and predicted critical sand production pressure drop based on the weakened rock strength reduced significantly. Furthermore, the stress intensity factor on the fracture tip induced by salt precipitation reached up to 1.22 MPa·m1/2, which was greater than the fracture toughness of tight sandstone, and it was used to explain the rock strength degradation. The results are helpful to the knowledge of the sand production problem in ultra-deep fractured tight sandstone gas reservoirs.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
盐沉降引起岩石强度退化:超深裂缝性致密砂岩气藏出砂新力学机制
& lt; abstract>本文以塔里木盆地某典型超深层致密砂岩气藏为例,研究其稀有出砂问题。介绍了出砂情况,并进行了常规分析。选取6个致密砂岩岩心塞,进行了盐沉淀前后的岩石力学试验。最后,建立了岩石强度退化的数学模型,探讨了岩石强度退化的机理。产砂预测结果表明,岩石骨架产砂不应出现,但在砂样中观察到岩石骨架,因此考虑了盐降水的影响。实验证明,盐降水导致岩石强度下降,岩石强度减弱后的临界出砂压降与实际值的差值显著减小。盐岩析出引起的裂隙尖端应力强度因子高达1.22 MPa·m<sup>1/2</sup>,大于致密砂岩的断裂韧性,可以用来解释岩石强度退化。研究结果有助于认识超深裂缝性致密砂岩气藏出砂问题。& lt; / abstract>
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
AIMS Geosciences
AIMS Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
7.70%
发文量
31
审稿时长
8 weeks
期刊最新文献
Digital infrastructure strategies: the case of the province of Caserta Geotechnical characterization of index and deformation properties of Stockholm clays Optimistic expectations and life satisfaction as antecedents of emigration attitudes among Bulgarian Millennials and Zoomers Point cloud registration: a mini-review of current state, challenging issues and future directions Design basis for Arctic infrastructure facilities
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1