How does a top drive system work?
A top drive is capable of drilling with three joints stands, instead of just one pipe at a time. Top drives typically decrease the frequency of stuck pipe, which contributes to cost savings. A top drive allows drillers to more quickly engage and disengage pumps or the rotary while removing or restringing the pipe.
What is a top drive Dolly?
A top drive system allows rotation and circulation while pulling out of a hole (back reaming). However, this operation cannot be performed with a Kelly system. A top drive is attached to a dolly track acting like a guide rail in a derrick. This allows straight movement up and down while drilling and tripping.
What rotates the drill string in a top drive system?
Used to rotate the drill string during the drilling process, the top drive is a motor that is suspended from the derrick, or mast, of the rig. These power swivels boast at least 1,000 horsepower that turn a shaft to which the drill string is screwed.
How much weight can a top drive typically hoist?
Hoisting capacity of this system is a full, 500 tons, using standard links and a drill pipe elevator or casing tools.
What is a top drive valve?
Upper top drive valves Intended for using as part of the upper power drive system for prompt overlap and pressurization of the drilling instrument tube channel in drilling the oil and gas wells, and also in maintenance and emergency works. (Mechanized control).
What is wash pipe in top drive?
The washpipe is rigidly mounted to the spindle of the top drive. Both rotary seals are mounted in seal carriers that have a journal bearing fit with the washpipe, and move laterally to accommodate washpipe runout.
What PPE is required to operate a hoist?
Before you start, you should use all the Personal Protective Equipment (PPE) normally required for a work area, including eye and hand protection, and a hard hat. Any time a load is lifted above 5 feet or shoulder height, there is a greater risk of head injury. Wearing a hard hat will minimize the risk.
How does a kelly drive work?
A kelly drive is a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table.
What is wash pipe in drilling?
The wash pipe is used when tubulars become stuck, where drilling mud is pumped down the wash pipe to wash away debris to free the stuck tubulars, allowing drilling operations to resume without disruption to the project.
What PPE is used when working on the overhead crane?
All crane operators, riggers and employees who work in the area where overhead cranes are in operation must wear the appropriate PPE, such as hard hats, safety glasses, work gloves and hard-toe boots.
What PPE should be used when rigging?
How do you handle an overhead load?
Centre the crane directly over the load before hoisting to avoid swinging the load.
- Do not allow anyone to ride on a load or hooks.
- Do not leave slings dangling from the load hook.
- Do not raise loads higher than necessary to clear objects.
- Do not move or pass a load over workers.
Which safety rules should be followed when using a crane?
Select the Right Crane for the Job. Ensuring safe crane operation begins with choosing the correct crane.
What is the most common hazard a rigger faces?
electrocution
The most common hazard that a rigger faces is electrocution? 3. Slings are made of which of the following materials? Wire rope.
What are rigger gloves for?
Rigger gloves are reinforced gloves, usually with a leather palm and a fabric back and a leather strap over the knuckles. They are usually one size fits all and, while they are designed to be used for rigging and cable pulling, they are suitable for a vast array of different tasks.
What is overhead load?
Overhead load. Human behaviour that is intended to be caused after understanding the safety sign’s meaning : Taking care to avoid being struck by or walking into an overhead load.
What is the most important consideration of load control?
Know the Weight of the Load Obviously, one of the most important things in maintaining load control is to ensure that you properly rig and lift the load according to its weight. Oftentimes, the item being lifted may have the weight marked on it.
Why choose Varco for your drilling rig?
Many leading inventions pioneered by Varco are holistic industry standards for modern drilling rigs, including our top drives, iron roughnecks, power slips, pipe-handling machines, and drawworks.
Who is Varco?
Varco is a recognized innovator in pipe-handling systems and the pioneer of the top drive. Beginning in metallurgy before moving into drill pipe-handling tools, Varco pioneered spinning wrenches and torque wrenches before integrating the two in the world’s first iron roughnecks.
Why choose Varco for Nov?
Access multiple NOV applications and services with one login. Varco is a recognized innovator in pipe-handling systems and the pioneer of the top drive. Beginning in metallurgy before moving into drill pipe-handling tools, Varco pioneered spinning wrenches and torque wrenches before integrating the two in the world’s first iron roughnecks.
What are Nov top drive systems?
Top Drive Systems As one of the most transformative developments in drilling history, NOV top drive systems are now the industry standard for both offshore and land drilling rigs.