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1. n. [Drilling]
Large-diameter pipe lowered into an
and cemented in place. The well designer must design casing to withstand a variety of forces, such as collapse, burst, and tensile failure, as well as chemically aggressive brines. Most casing joints are fabricated with male threads on each end, and short-length casing couplings with female threads are used to join the individual joints of casing together, or joints of casing may be fabricated with male threads on one end and female threads on the other. Casing is run to protect
formations, isolate a zone of
or isolate formations with significantly different pressure gradients. The operation during which the casing is put into the wellbore is commonly called "running pipe." Casing is usually manufactured from plain carbon steel that is heat-treated to varying strengths, but may be specially fabricated of stainless steel, aluminum, titanium, fiberglass and other materials.
cement bond log
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2. n. [Well Completions]
Steel pipe cemented in place during the construction process to stabilize the wellbore. The casing forms a major structural component of the wellbore and serves several important functions: preventing the
wall from caving into the wellbore, isolating the different formations to prevent the flow or
, and providing a means of maintaining control of formation fluids and pressure as the well is drilled. The
provides a means of securing
control equipment and downhole
equipment, such as the drilling
. Casing is available in a range of sizes and material grades.