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Abstract Because of the coring difficulty in deep-layer salt formation，artificial cores were made according to its field mineral composition. Creep tests were conducted which shows that the natural core and the artificial core with the same mineral composition had the same creep law. In light of this finding，further creep tests of the artificial core were carried under different confining pressures and same temperature，and the effects of contents of different mineral compositions on the creep were obtained. The test results showed that under the same stress and temperature condition，the steady-state creep rate of high-salt salt-gypsum formation was higher，while the high-gypsum salt-gypsum formation was lower. At the same time，the physico-chemical property analysis were conducted for natural core in Caspian Basin，which also verified the above conclusion. The test result was tested in two ultra-deep wells in Keshen block in Tarim oil field and was applied to determination of drill fluid density.
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Received: 08 June 2012
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2013, Vol. 32 
