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GLOSSARY

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Zone isolation

A method of scaling off, temporarily, a producing formation while the hole is being deepened. A special substance is forced into the formation where it hardens allowing time for the well bore to be taken on down. After a certain length of time, the substance again turns to a liquid unblocking the producing formation.

Zone of lost circulation

An interval in a subsurface formation so porous or cut with crevices and fissures that the drilling mud is lost in the pores, cracks, or even a cavern, leaving none to circulate back to the surface.

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