Special Report: Pre-Caspian basin wells in salt-gypsum beds require an optimized drilling fluid

Drilling wells through the ultrathick, salt-gypsum beds in the pre-Caspian basin requires an optimized drilling fluid.The fluid must effectively inhibit salt-gypsum creep, salt dissolution, and hydration expansion in the water-sensitive formation to keep the borehole stable under high pressure and high temperatures.Pre-Caspian basinThe pre-Caspian basin has the most promising onshore deep oil and gas bearing zones in the former Soviet Union. Also it is already one of the world's most important oil producing areas.A large portion of the basin lies in the southern part of Kazakhstan, and the rest is in Russia. The basin, with a total area of 50,104 sq km (1,000 km from east to west and 500 ...

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