What is a kelly bar?
What is a kelly bar?
Kelly bars (also called grief joints, kelly joints and kelly stems) are used during the execution of boreholes by hydraulic rotary drilling rigs. The bars themselves are hollow and attach to the top of the drill column. Many kelly bars can be applied to any type of piling rig that is available on the market.
What is a Kelly rod?
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 friction kelly bar?
Friction type drill Kelly bar is a kind of drill pipe type with international advanced six-ribs distribution technology composition. It is simple operation, drilling depth . it is suitable for soft soil layer and mud sand layer.
What is the function of Kelly?
The kelly is used to transmit rotary motion from the rotary table or kelly bushing to the drillstring, while allowing the drillstring to be lowered or raised during rotation.
What is Kelly down?
1. adj. [Drilling] Referring to the condition that occurs when the kelly is all the way down, so drilling progress cannot continue. A connection must be made, which has the effect of raising the kelly up by the length of the new joint of drillpipe added, so drilling can resume.
What is a drill rig Kelly Bar?
Kelly bars are key components in the execution of boreholes with hydraulic rotary drilling rigs. They transfer the torque of the rotary drive and the crowd pressure of the crowd system concurrently to the drilling tool.
What is kelly bushing height?
Kelly Bushing Height (KB): The height of the drilling floor above the ground level. Many wellbore depth measurements are taken from the Kelly Bushing. The Kelly bushing elevation is calculated by adding the ground level to the Kelly bushing height.
What does kelly bushing mean in drilling?
1. n. [Drilling] An adapter that serves to connect the rotary table to the kelly. The kelly bushing has an inside diameter profile that matches that of the kelly, usually square or hexagonal. It is connected to the rotary table by four large steel pins that fit into mating holes in the rotary table.
What is the use of a mousehole?
The main function of the mousehole is to hold pipe during stand building or breakdown. Mouseholes are designed to use the area below the drill floor and are flush-mounted with the drill floor on installation.
