What is casing in drilling rig?
Casing is typically hollow steel pipe used to line the inside of the drilled hole (wellbore) and is essential for protection of groundwater and aquifers in a drilling operation. The existing industry standard for oil and gas casing was established by the American Petroleum Institute (API) ‡ in Specification 5CT.
surface casing. First, the surface casing protects fresh-water aquifers onshore. Second, the surface casing provides minimal pressure integrity, and thus enables a diverter or perhaps even a blowout preventer (BOP) to be attached to the top of the surface casing string after it is successfully cemented in place.
- In oil drilling and borehole mining, a casing shoe or guide shoe is a bull-nose shaped device which is attached to the bottom of the casing string. A casing hanger, which allows the casing to be suspended from the wellhead, is attached to the top of the casing.
- Liner is a casing string that does not extend back to the wellhead, but is hung from another casing string. Liners are used instead of full casing strings to: Reduce cost. Improve hydraulic performance when drilling deeper.
- Casings are soft cylindrical containers used to contain sausage mixes (Fig. 314). Casings can be of natural origin or artificial. Natural casings are obtained from animal intestines derived from slaughtering. Manufactured artificial casings are made of cellulose, collagen or synthetic materials.
In petroleum production, the casing hanger is that portion of a wellhead assembly which provides support for the casing string when it is lowered into the wellbore. It serves to ensure that the casing is properly located. This is usually welded or screwed to the top of the surface casing string.
- The primary purpose of production casing is to isolate the zone containing natural gas from other subsurface formations. It's also used to pump hydraulic fracturing fluids into the producing formation without contacting other formations along the wellbore.
- Pertaining to a range of products, services and techniques designed to be run through, or conducted within, the production tubing of an oil or gas well. The term implies an ability to operate within restricted-diameter tubulars and is often associated with live-well intervention since the tubing is in place.
- Coil Tubing Operator. The Coil Tubing Operator is responsible for using continuous coiled tubing to perform insertion tasks like pumping fluids down the well to stimulate the flow of oil or gas.
Updated: 13th September 2018