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13gotco international 11410 Spring Cypress Rd - Tomball, Texas 77377 USA Sales 281 591 1874 Fax 281 999 4251 1 800 OVERSHOT

Bumper Sub

The Gotco Fishing Bumper Sub is a highly dependable accessory tool. Suitable for all fishing operations, it has proven to be especially successful in surviving harsh down-hole applications. The tool design allows full torque and unrestricted fluid circulation at all times. Standard stroke is 20 inches; other stroke lengths are available on request.

Typical operations include releasing stuck drill pipe, drill collars, tubing, test tools, and safety joints. Also, the fishing bumper sub functions well when used with an overshot or spear.

Construction

The fishing bumper sub is constructed from specially heat treated high-strength alloy steel to withstand severe stress resulting from tension, jarring, and torque. A double-seal piston assures full circulation through the tool during fishing operations.

Assembly and Operation

The fishing bumper sub is installed in the fishing string immediately above the fishing tool or safety joint. To apply a sharp downward blow, mark the pipe at surface to indicate open and closed positions of bumper sub. Raise fishing string to open bumper sub and allow for some additional pipe stretch. Drop string sharply and stop with the brake approximately 4 to 6 inches above the closed position of bumper sub. As the fishing string springs downward, the bumper sub will deliver a sharp downward blow. To apply a solid downward blow, raise fishing string to open bumper sub plus exert a slight stretch in string. Drop full weight of pipe without braking to deliver a strong downward blow.

To apply an upward blow, mark pipe at surface to indicate open and closed positions of bumper sub. Raise fishing string to open bumper sub plus exert moderate strength in string. Drop string by the amount of pipe stretch only and catch it with the brake. As pipe recoils at the bottom of the hole, the bumper sub will deliver a sharp upward blow.

Standard Components

The fishing bumper sub is composed of five major parts:
  1. The Mandrel
  2. Kelly Sub
  3. Piston
  4. Barrel
  5. Top Sub
The mandrel includes a hex kelly that is engaged by the kelly sub to transmit torque. The barfrel has a precision honed I.D. to assure a positive seal with the piston.

Optional Components and Accessories

Stroke lengths up to 60 inches are available upon customer's request.

Download

For sizes, specifications, and ordering instructions download this page in PDF.
accessory tools
 
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  Larger view of the
  Gotco Bumper Sub
























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