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Oilfield Drilling Chemicals Oilfield drilling is a process of boring hole into to the earth crust for natural gas and oil. To do this, a long bit attached to a "drilling string" is used. The bit varies in diameter from five to 50 inches. After each section is drilled, a steel pipe slightly smaller than the hole diameter is dropped in and often cement is used to fill the gap.This "casing" with cement is used to give some structural integrity to the hole and to isolated high-pressure ar …