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What are the components of a drill string?

What are the components of a drill string?

The “drill string” is composed of “knobbies,” drill pipe, a bottom-hole assembly (see the BHA tool sheet), and a bit (see the Core Bit tool sheet). It is used to deploy and retrieve (i.e., “run” and “pull”) all of ODP’s coring/drilling BHAs, reentry structures, completion hardware, and associated equipment.

What is meant by drill string?

A drill string is a pipe made from a series of steel tubes, that is attached to the drilling tool and which turns during drilling to make a hole. The drill string is formed from thirty-foot lengths of steel tubing screwed together to form a pipe that connects the drill bit to the drilling rig.

What is the function of drill string?

A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied to the assembled collection of the smuggler pool, drill collars, tools and drill bit.

How many meters is a drill string?

Drill pipe comes in three ranges of length. Range one is 18 to 22ft, or 5.5 to 6.7m. Range two is 27-30ft or 8.2 to 9.1 meters.

What is the difference between drill collar and drill pipe?

Much like drill pipe, drill collars are made in 31ft lengths and are screwed together vertically on the drilling rig. In contrast, to drill pipe, drill collars are thick-walled and heavy, with very limited flexibility. Drill collars are used at the bottom of the drill string, just above the drill bit.

What does MD stand for in drilling?

In the oil industry measured depth (commonly referred to as MD, or just the depth), is the length of the borehole. In conventional vertical wells, this coincides with the true vertical depth, but in directional or horizontal wells, especially those using extended reach drilling, the two can deviate greatly.

Major components that comprise a drill string are drill pipe, jar, drill measurement tool (MWD Tool), drill stabilizers, rotary steerable, drill hole opener, and drill motor.

What is the difference between drill string and BHA?

The drillstring means the tubulars and the accessories used to run the drill bit to the bottom. The drill string is composed of drill pipe, heavy weight drill pipe, drill collars and other components like stabilizers and drilling jars. The bottom hole assembly BHA is the components used above the bit without taking in consideration the drill pipe.

What are the parts of a drill pipe?

It is seamless with threaded connections. The drill pipe has two tool joints, one female is called a box and the other male is called pin. The outer diameter of the tool joint is larger than the body of the drill pipe to accommodate the threads. One drill pipe is called a single or a joint.

How to extend the life of a drill string?

The same skill was utilized in formulating suggested practices in the care and handling of pipe on the surface, while making trips in and out of the hole and while drilling. With this information, contractors and operators can extend drill-string life and realize inprove project economics.