What is drill collar in drilling?

1. n. [Drilling] A component of a drillstring that provides weight on bit for drilling. Drill collars are thick-walled tubular pieces machined from solid bars of steel, usually plain carbon steel but sometimes of nonmagnetic nickel-copper alloy or other nonmagnetic premium alloys.

What is the difference between drill string and drill pipe?

The drill pipe constitutes the majority of the drill string length. 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.

What is the length of drill collar?

The term drill collar derived from the short sub originally used to connect the bit to the drill pipe. Amodern drill collar is about 30 ft long, and the total length of the string of drill collars may range from about 100 to 700 ft or longer. The purpose of drill collars is to furnish weight to the bit.

What is the purpose of drill collar?

The primary purpose of a drill collar is to apply weight and force on the drill bit in order to help control direction and wellbore stability. However, that’s not the only benefit it brings to a drill string. Drill collars work to keep drill strings from buckling under pressure.

Which drill is more powerful?

1. Best Powerful Cordless Drill Kit—Dewalt. At 3.64 pounds, this Dewalt 20V MAX XR cordless drill is one of the most compact drills around. Made of steel, with 530 pounds of torque, and two speeds ranging from 0–450 and 1,500 RPM, this drill can still deliver on even the toughest jobs despite being lightweight.

What is the purpose of a drill collar?

use in rotary drilling pipe are extra-heavy sections called drill collars, which serve to concentrate the weight on the rotating bit. In order to help maintain a vertical well bore, the drill pipe above the collars is usually kept in tension. The drilling mud leaves the drill pipe through the bit in such a…

What is drill collar used for?

What is a float collar?

1. n. [Well Completions] A component installed near the bottom of the casing string on which cement plugs land during the primary cementing operation. It typically consists of a short length of casing fitted with a check valve.

How long is drill pipe?

27 to 32 feet
Drill pipe, is hollow, thin-walled, steel or aluminium alloy piping that is used on drilling rigs. It is hollow to allow drilling fluid to be pumped down the hole through the bit and back up the annulus. It comes in a variety of sizes, strengths, and wall thicknesses, but is typically 27 to 32 feet in length (Range 2).

How does drill collar work?

Drill Collars in Drilling Application Gravity works on a number of drill collars to offer enough downward force needed to break rocks with the drill bit. Apart from providing weight on the bit (WOB), drill collars also work as a shock absorber to dampen the vibration and shaking when drilling takes place.

Which is the best connection for a drill collar?

PAC connections continue to be very popular for 2-3/8 inch drill pipe as well as small diameter drill collars. They offer good clearance, but often at the price of alarmingly low tensile and torsional capacity. PAC’s are very poor selections for drill collars.

What kind of drill pipe is heavy weight?

Heavy weight drill pipe is a medium-weight drill pipe, (referred standards in API SPEC 7-1). It has bigger wall thickness than common drill pipe and smaller than drill collar. The tube is connected with special length-added drill pipe joint (integral heavy weight drill pipe is made up of tube and tool joint).

What are the dimensions of a drill pipe?

Drill Pipe Specifications 1 Drill Pipe Sizes and Weight 2 Mechanicl Properties and Capacity 3 2 3/8”, 2 7/8” and 3 1/2” Drill Pipe for Common Use.

What are the specifications of an API drill pipe?

The Drill Pipe Grade Specifications API Drill Pipe Grade Minimum Yield Strength (psi) Minimum Tensile Strength (psi) E-75 75,000 100,000 X-95 95,000 105,000 G-105 105,000 115,000 S-135 135,000 145,000