What is the difference between casing and liner?

What is the difference between casing and liner?

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.

What is a tieback liner?

A section of liner that is run from a liner hanger back to the wellhead after the initial liner and hanger system have been installed and cemented. A tieback liner may be required to provide the necessary pressure capacity during a flow-test period or for special treatments, and is typically not cemented in place.

What is Liner Top?

The Liner Top Packer is used as an isolation packer on the top of the liner system. It consists of a one-piece seal element with bonded metal back-up rings and is available with (XTS Top Packer) or without (ITS Top Packer) hold down slips.

What is production liner?

A production liner is a string of casing set across a production interval but does not extend all the way back the surface. Usually there is about a 500 ft (more or less) overlap between a liner and the casing string above. The production liner has the same function as a complete string of production casing.

What is the difference between drill pipe and tubing?

Drill pipes are durable steel pipes that conduct the force to the drill bit when drilling process. Casing refers to the casing pipe which is tubing that is set inside the drilled well to protect and support the well stream.

What is a liner hanger and tie-back?

The integrated liner hanger tieback system is a fully anchored metal-to-metal seal created by expanding the tieback directly to the liner system. A traditional tieback is typically a floating seal anchored by mechanical devices or cement.

What is a tie-back receptacle?

Tie-Back Receptacle attaches to the Liner Top Packer and provides a sealing bore. This polished bore is used to tie the well back to surface, provide a sealing bore for fracturing operations or for landing a second trip packer in case of a liner-top leak.

What is the difference between tubing and casing?

Tubing naturally has a smaller diameter than casing, except for the 4 1/2-inch diameter. Anything smaller is called tubing, anything larger is casing. From the surface to the bottom of the well, the casing telescopes down in size – there are various types of casing depending on their purpose and diameter.

What is a liner in the oil industry?

1. n. [Drilling] A casing string that does not extend to the top of the wellbore, but instead is anchored or suspended from inside the bottom of the previous casing string.

How many types of casings are there?

The five types of casing string are conductor casing, surface casing, intermediate casing, casing liner, and production casing.

What is well bore?

A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources, including oil, gas, or water. A wellbore is the actual hole that forms the well. A wellbore can be encased by materials such as steel and cement, or it may be uncased.

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