Deep, hot wildcat drills fast and problem-free with conventional oil-base fluid

Without hole problems and at high rates of penetration (ROP), ChevronTexaco Corp. successfully drilled a deep, hot South Texas well, named Endeavour No. 2, under high temperature, high-pressure (HTHP) conditions using a conventional diesel oil-base fluid.Drilling to 21,500 ft with 480° F. bottomhole temperature is not easy under the best circumstances. Factor in the absence of equally deep offset wells, the last 6,000 ft of the well can become an HTHP guessing game.In an area where every offset well was plagued by lost circulation, stuck pipe, and radical fluctuations in HTHP fluid-loss rates, the company's Endeavour No. 2 avoided these hole problems, even during long periods of ...

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