Drilling 20,000'+ high-pressure gas wells in southeastern Oklahoma (figure 1) presented numerous organizational, operational, and technological problems. Long open-hole sections between surface problems. Long open-hole sections between surface pipe shoe and intermediate pipe setting depth pipe shoe and intermediate pipe setting depth presented a number of problems. Among them were presented a number of problems. Among them were hole stability, corrosive gas influxes, over- and under-pressured formations and drill string fatigue. Deep high pressure sections below intermediate casing required high-strength tubulars and wellhead equipment. Industry shortages of materials and equipment plus inexperienced personnel compounded the difficulties. personnel compounded the difficulties.

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