Stafford County Museum Collection


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Approximate Date

February 1941


This black and white photograph contains a description of a drill collar. Russell Walker ordered the photograph.

Physical Description

8" x 10" Glass-plate negative


Drills (Equipment)


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Gray Studio Glass Plate Negative Collection


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August 18, 1937. To Whom it may concern: This is a description of a drill Collar or Wash Collar description designed inclosed[sic]. Part Number (1) the drill collar or wash collar. Part " (2) the Reamers, any number or can be omitted. Part " (3) the ball to drop in after you get in the hole with the drill pipe before you put the Kelly Joint on the drill pipe and start to drilling, for the purpose of giving you the Volume down to where the tubes are installed in part five to be described later. This can either be a ball with holes in it or it can be a tapered plug with a oblong hole in it to fit in the part (4) and Part (6) as they will be described later[Illegible] and spring as used in mud pumps & screen. Part number (4). Is a tapered hole to fit part (3) and being a separate part from part (5) and directly in line with part (6). and part (4) and part (5) having a tapered thread to screw them tight in part (1) but the threads being different size taper they cannot screw up closer than one inch of each other or whatever the occasion requires. Part number (5) being the seat for all part number (7) as will be described later. part five will have a tapered hole in line which is part (3, and will be described later. Part (6) Is a tapered hole and is to be directly in line with part (3) as the occassion[sic] requires. Part (7) is the lines drawn down from part (5) and these are 6-1/2" tubes or holes or any size of the hole, being drilled in the ground. Therefore you have your volume down to part (4) and greater bottom hole pressure through the tubes and in this event your pump pressure through the tubes, and in this event your pump pressure is reduced a large percent and you still have perfect circulation around your bit and drill pipe as the occassion[sic] may require.


Drills (Equipment)


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