|STARLINE CASING JACKS ARE HYDRAULIC DRIVEN SET OF CYLINDERS USED TO LIFT AND/OR LOWER HEAVY STRINGS OF CASING, TUBING OR DRILL PIPE.
THEY ARE DESIGNED AND MANUFACTURED TO HANDLE THE SEVERE CONDITIONS OF CASING WORK. OUR STANDARD JACKS CONSISTS OF 4 CYLINDERS, THIS KEEPS THE OVERALL
SIZE TO A MINIMUM.
THEY CAN BE OPERATED RUNNING ALL 4 JACKS OR JUST 2. PROFITS ARE THE BOTTOM LINE AND USING OUR JACKS SAVES TIME, LOWERS COST AND
ARE SAFER THAN OTHER METHODS.
**STARLINE IS THE ONLY COMPANY NOW OFFERING A WRAP-AROUND VERSION.**
CASING JACKS CAN BE USED TO DO THE FOLLOWING:
- REMOVING WELLHEAD SLIPS
This requires that the pipe string be lifted to take the string weight off the wellhead slips.
The force required to move the pipe upward may be greater than the safe pull force of the
workover rig and sometimes even greater than a drilling rig. The Starline jack can be used
to safely apply the necessary pull force.
This is a method of determining the free-point of a pipe string. The free-point being the
down-hole location of a point above which the pipe can be parted and pulled without
exceeding the safe pull force of the pipe. Experience has shown that the free-point
determination is subject to the limitations of the equipment and procedure. Our jacks can
be equipped with instrumentation to accurately measure and apply necessary forces and to
accurately measure the pipe stretch resultant from these forces to get the maximum
amount of pipe out of the hole.
- WORKING THE CASING
In order to maximize the recovery of casing it is important to work the casing. Working the
casing involves lifting and lowering the casing using our jack as well as lifting and dropping
the pipe using the work-over rig. This process conditions the hole and allows greater pipe
movement up and down the hole. This process is continued until the casing no longer moves
downward. The casing is then in a worked down condition. Sometimes it is necessary to move
the casing up and down using our jack in order that the rig can pick up the casing enough to
work the pipe down effectively. The casing can be marked to monitor pipe movement. A
free-point procedure can be performed to determine the amount of free pipe when the
casing quits moving upward or downward.
- PARTING THE PIPE
The pipe string is parted by backing off, cut mechanically, by an explosive shaped charge in
the body of the pipe, by shaped charge splitting the collar or by using dynamite or nitro
explosives located in the collar. Our jacks can provide a precise and constant pull force.
Manufactures of explosive devices used to part pipe recommend that the pipe be in tension
by at least 1.3 times the weight of the pipe being shot off. Sometimes it requires that the
pull force required to finish parting the pipe approach the safe pull force of the pipe. When
parting the pipe using a mechanical cutter, our jack can hold the pipe using a rotational
bearing to prevent subsidence. Our jack fitted with a rotating bowl, has been used to
unscrew casing patches.
- RUNNING THE PIPE
Starline jacks have been used to run pipe when a work-over rig or a drilling rig could not
safely handle the string weight.