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The drill string is pushed against one side of the well bore. The force required to pull the string along the wellbore in this occurrence is a function of the total contact surface area, the pressure difference and the friction factor. Keyhole sticking occurs mechanically as a result of pulling up into doglegs when tripping.
A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.
Tripping pipe (or "Making a round trip" or simply "Making a trip") is the physical act of pulling the drill string out of the wellbore and then running it back in. This is done by physically breaking out or disconnecting (when pulling out of the hole) every other 2 or 3 joints of drill pipe at a time (called a stand ) and racking them ...
Engraved on the handle of the hatchet, the pin reads, "Death to Rum". [2] Gold or silver style safety pins were commonly used as tie and collar pins from the beginning of the 20th century. Such a safety pin was used to fasten the tie to the shirt and was an integral part of a man's clothing or school uniform, being especially useful on formal ...
This tackle involves the defender reaching his hand inside the ball carrier's collar, grabbing the collar (and usually, the collar of the shoulder pads), and pulling player straight down or backwards and down. The tackle has the potential to cause severe injuries to the tackled player's neck, legs and ankles.
A split pin, also known as a cotter pin, or cotter key in the US, [1] is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.
A collar pin (closely related to the collar bar and collar clip) is a piece of men's jewelry, which holds the two ends of a dress shirt collar together and passes underneath the knot of a necktie. Functioning in a similar way as a tabbed collar , it keeps the collar in place and lifts the knot to provide a more aesthetically pleasing arc to the ...
Variety of loose pogo pins and pogo pins in 3-pin assembly holders and with Pick and Place caps Sectional drawing of a pogo pin, showing the plunger, barrel, and spring. A pogo pin or spring-loaded pin is a type of electrical connector mechanism with spring plungers that is used in many modern electronic applications and in the electronics testing industry. [1]