Supporting Technology for Ultra-high Temperature Deep Well Drilling Fluid in Bohai Oilfield
With the increase of drilling depth,formation temperature becomes the main factor restricting the selection of drilling fluid system.Under high temperature conditions,the requirements for stable drilling fluid performance,well wall integrity and lubricant compatibility are relatively strict.The low biotoxicity and easily degraded high temperature resistant polymer,salt-resistant polymer PF-DFL180 and PF-DFL200 can meet the conditions,and the combination of high temperature resistant lubricant PF-LUBE220 can effectively reduce drilling torque.Through the field application summary of THERM DRILL and solid-free HTFLOW drilling fluid systems,combined with indoor evaluation,the drilling fluid system was optimized and upgraded,and the ultra-high temperature deep well drilling fluid technology for Bohai oilfield was formed.
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