Table of Contents
What is a drill string used for?
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.
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 does a drill string consist of?
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 equip- ment.
How long is a stand of drill pipe?
The Drill String is made up of several sections of Drill Pipes. The term “stand” consists mainly of two or three drill pipes joints which will have a length around 60 to 90 feet. every joint of pipe is referred to as a “single”.
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 are drill collars?
Drill collars are thick-walled tubulars that are used at the bottom of the drill string (see Figure 4-1). Their principal purpose in the drill string is to provide the axial force needed to advance the drill bit (see Figure 2-2). When drilling a vertical borehole, the axial force is the weight of the drill collars.
What are the different grades of drill pipe?
PS-1 specifies wall thickness, impact strength, and yield strength requirements specific to the material grade….API Grade Drill Pipe.
| 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 |
What is range 3 drill pipe?
Drill pipe tubes are furnished in the following API length ranges: • Range 1: 18-22 ft; • Range 2: 27-30 ft; • Range 3: 38-45 ft.
What does brushless mean on a drill?
A drill with a brushless motor adjusts its speed, torque, and power supply to match the task at hand. It’ll sense if you’re driving screws into a light material like drywall or a dense material like mahogany, and use only enough power to accomplish the job.
What is a good torque for a drill?
Newton Metres (Nm) on drills: 4 to 15Nm is fine for all of those smaller screw driver tasks around the home. 15 to 35Nm is a great all-rounder to drill and drive medium sizes screws and hole drilling. 35Nm upward will tackle all of those more serious project with bigger screws and holes.
Why do we use drill collar?
The drill collar is used to concentrate a heavy mass near the lower end of the drill column. A drill collar is a thick tubular piece at the bottom of a drillpipe, which concentrates the weight on the rotating drill bit.
What is the difference between drill collar and heavy weight drill pipe?
Heavy weight drill pipe is the most commonly used in the vertical section of the hole and provides weight on the bit for directional drilling while maintaining more flexibility than a drill collar. The function of the HWDP is to provide a flexible transition between the drill collars and the drill pipe.
What is the “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 equip- ment.
What is drdrill pipe?
Drill pipe is the smallest piece of the Drill String (OD to ID / wall thickness) and represents the least weight in pounds per foot. It is being pulled to TD by the heavier string below it.
What is drill stem?
Drill stem is all those members between the swivel and the bit, and it includes drill string, kelly or top drive, subs, drill collars, heavy weight drillpipe, stabilizers, shock absorbers, reamers and any other in-hole equipment used generally or part-time during drilling operations.
How does a drill bit work?
The drill string is supported by the top drive (in the derrick), which rotates the drill string at the surface to drive the bit and allow the drill string to advance downhole.