FISHING TOOLS - National Oilwell Varco
FISHING TOOLS - National Oilwell Varco
FISHING TOOLS - National Oilwell Varco
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Surface Bumper Jars<br />
Bowen ® Surface Bumper Jar<br />
Sold Export Only<br />
The NOV Downhole Bowen ® Surface Bumper Jar is designed to be installed in the drill<br />
string at the surface during fishing operations which require downward jarring impacts against<br />
a fish at the point where it is stuck. By a simple adjustment it may be set to vary the jarring<br />
force. The stroke of the tool is 48 inches, allowing the fish to be hammered down much farther<br />
than could be done with a conventional rotary jar. This tool provides many other outstanding<br />
advantages.<br />
It is unique in that it is used only on the surface to release a stuck fish. Due to this intermittent<br />
usage, the service life of this tool is greatly extended when compared with conventional<br />
bumper subs.<br />
The Bowen ® Surface Bumper Jar may be used to great advantage where the downhole drilling,<br />
fishing or washover running string becomes stuck, and a heavy downward force is required<br />
to release it. It is often used to free keyseated drill pipe and drill collars, and to initiate abrupt<br />
jarring impacts down the string to actuate Drilling Bumper Subs, Bumper Safety Joints and<br />
other similar downhole bumping tools. It is also useful for transmitting very heavy downward<br />
forces to release grappling tools such as Overshots or Spears when the grapples or slips<br />
have become imbedded in the fish or have become fouled due to repeated and prolonged<br />
downhole jarring. In many instances it has been successfully used where all previous methods<br />
have failed.<br />
Full torque may be utilized in either direction, and full circulation may be maintained through<br />
the tool during its operation.<br />
Basically, the Bowen ® Surface Bumper Jar consists of a hexagonal Mandrel Assembly working<br />
in a Bowl Assembly. The length of the stroke is important since, when using the tool, it is not<br />
necessary that the two striking surfaces meet as with conventional downhole jarring tools.<br />
RECOMMENDED SPARE PARTS:<br />
(1) 2 Washpipes<br />
(2) 1 Seal Insert<br />
(3) 1 Friction Mandrel<br />
(4) 1 Control Ring<br />
(5) 1 Friction Slip<br />
(6) 1 Control Ring Plug<br />
(7) 4 Non-Extrusion Rings<br />
(8) 4 Seal Protector Rings<br />
(9) 6 Packing Sets<br />
Send for Bowen ® Technical Manual No. 4300 which includes complete descriptions of construction, operation,<br />
maintenance, and parts listing for Bowen ® Surface Bumper Jars.<br />
Bowen ® Surface Bumper Jars<br />
Size and Connections *<br />
Outside Diameter (inches) 7<br />
Inside Diameter (inches) 1 7/8<br />
Total Stroke (inches) 48<br />
Overall Length 11’ 11”<br />
Complete Assembly Part No. 74520<br />
Weight 1160<br />
*Connection to be specified by customer.<br />
<strong>FISHING</strong> <strong>TOOLS</strong><br />
Bowen ® Surface Bumper Jar<br />
Top Sub<br />
Knocker Sub<br />
Bowl Extension<br />
Mandrel<br />
Washpipe<br />
Seal Insert<br />
Control Ring Plug<br />
Friction Mandrel<br />
Friction Slip<br />
Bowl<br />
Friction Slip Spacer<br />
Bottom Sub<br />
31
Change language