Introduction to Casing Pipe in Drilling Technology

Overview

During the drilling process, in order to maintain the stability of the wellbore and avoid formation rupture, a series of casing pipes are usually installed on the wellbore wall. The role of the casing pipe is to strengthen the wellbore wall, fix the wellhead and maintain the stability of the wellbore. It is also used to separate different strata to prevent the mixing of oil, gas, water and other substances.

Types

Common types of casing pipe include production casing pipe, tail pipe, cementing casing, liner pipe, operating casing, etc. Casing pipe belongs to octg pipe, mostly made of seamless steel pipe. Production casing is mainly used for the output of oil and gas wells, while tail pipe is usually used to move drilling rigs or other equipment during the wellhead trip. Cementing casing is mainly used for cement cementing treatment. Liner pipe is mainly used to protect the wellbore wall and prevent wellbore collapse. Operating casing is mainly used for some special operations, such as removing sediments.

Manufacturing materials

Casing pipe is generally made of high-strength steel or drill pipe. Depending on the depth of the well and working conditions, the strength and corrosion resistance of the material are also different. In some special cases, composite materials such as titanium alloy, nickel alloy or fiberglass are also used.

Installation method

The installation of casing pipe is generally divided into two ways: casing pipe lowering and floating casing pipe. During the casing pipe lowering process, the drill pipe is gradually driven into the formation, and the casing pipe is installed layer by layer until the wellbore is completely closed. The floating casing suspends the casing pipe part in the drilling fluid to maintain the stability of the wellbore, and installs it layer by layer into the wellbore wall through the drill pipe.

Application prospects

Casing pipe plays an important role in modern drilling technology, and its application prospects are also increasingly broad. With the development of drilling technology, more new types and materials of casing will also be applied to the well to adapt to different working conditions and well depth requirements.

Summary

This article mainly introduces the casing pipe in drilling technology, including the types, functions, manufacturing materials and installation methods of casing pipe. Casing pipe plays an important role in the drilling process and is an important equipment to ensure wellbore stability and production safety.