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Casing Diameters of a Borehole Casing Diagram premium gas tight connections on a casing string. Casing is a large diameter pipe that is assembled and inserted into a recently drilled section of a borehole. Similar to the bones of a spine protecting the spinal cord, casing is set inside the drilled borehole to protect and support the wellstream.
Since casing strings are cemented in place, this is significantly more difficult and expensive than replacing the completion string. If in some instances the casing string cannot be removed from the well, it may be necessary to sidetrack the offending area and recomplete, which is also an expensive process.
The cost of a routine abandonment of a typical well in the United States is about $5,000 (~Texas average cost in year 2000). If a well has developed a leak that allows gas to flow up the outside of the well casing, finding and correcting the leak can push the cost of abandonment beyond $100,000.
CCL – casing collar locator (in perforation or completion operations, the tool provides depths by correlation of the casing string's magnetic anomaly with known casing features) CCLBD – construction / commissioning logic block diagram; CCLP – casing collar locator perforation; CCLTP – casing collar locator through tubing plug
Gas lift well: gas is fed into valves installed in mandrels in the tubing strip. The hydrostatic head is lowered and the fluid is gas lifted to the surface. Single-well alternate completions: in this instance there is a well with two zones. In order to produce from both the zones are isolated with packers.
A liner is a casing string that does not extend to the surface, being hung instead from a liner hanger set inside of the previous casing string but usually within about 300 feet (91 m) of its bottom. Other than the obvious cost savings, the liner installation allows larger drill pipe or production tubing to be used in the upper portions of the ...
Provide a means of casing suspension ... In general well heads are five nominal ratings of wellheads: 2, 3, 5, 10 and 15 (×1000) psi working pressure.
Cost decreases with depth, with no limit on depth of bore hole. ... Continuous drilling process without replacement of mechanical parts; Constant casing diameter;
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