Pre-Caspian basin wells in salt-gypsum beds require an optimized drillino fluid

Yan Jin, Mian Chen, Kangping Chen, Henglin Yang, Yingjian Xiao, Shidong Ding

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Drilling wells through the ultra-thick, salt-gypsum beds in the preCaspian basin requires an optimized drilling fluid. The pre-Caspian basin has the most promising onshore deep oil and gas bearing zones in the former Soviet Union. The basin has widely spread, ultra-thick, salt-gypsum beds in the Sagiski, Federovskoye, Adaiski, Ural-Volga, and Kolzhan-Uyaly blocks and well developed salt dome structures. Drilling of the thick salt beds, 2,000-4,000 m can lead to plastic flow of the salt, which threatens drilling safety. Proper drilling fluid density is then determined from the on-site borehole shrinkage rate required for safe drilling. This method includes creep parameters measured in the laboratory and complicated shrinkage-rate calculations of salt rocks. Analysis of borehole well rock deformation properties in deep salt beds requires an understanding of the short-term mechanical behavior of salt rock because such behavior determines the mechanisms for long-term rock deformation.

Original languageEnglish (US)
Pages (from-to)46-53
Number of pages8
JournalOil and Gas Journal
Issue number4
StatePublished - Feb 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology


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