and prevent collapse. After the casing has been emplaced, the well is pumped to recover the oil and gas. The first petroleum reservoirs exploited by humans were found as a result of seeps on the surface. The 1st oil well was drilled in Titusville,
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PA., in 1859. Oil wells eased petroleum recovery and initiated an oil boom, and within years, 1,000s of oil wells had been drilled. It was soon realized that a systematic approach to oil exploration was essential to prevent drilling dry holes. An oil or gas