On arrival at the well, the unit should be positioned in the following manner:
• The operator must be able to see the stuffing box and floor block from wire line unit controls.
• If in truck mounted unit, the truck should be braked and substantial chocks should be placed behind the rear wheels to prevent movement of unit while in operation.
Once the rope socket is made and lubricator sections are assembled, string of tools are connected and passed through the bottom end of the lubricator so that tool top is visible at the other end of lubricator. The rope socket is made up on the tool string. Any free wire between the rope socket and stuffing box is then drawn carefully back through the stuffing box until the self aligning union can be made up to join the stuffing box to the top of the lubricator( at no stage wire should get crimped or bent). The wire is then brought out side the lubricator and clamped.
Gin pole assembly helps in hoisting the lubricator on top of the BOP. The Gin pole assembly is mounted in the following ways:-
Ensure first that the telescopic section slide freely within one another.
Make sure that the pulleys and hoisting rope are unraveled and ready for use.
Hook the top pulley back to the eye in the top section of the Gin pole.
Place the Gin pole in the vertical position ensuring that the base of the Gin pole is resting over any of the nuts in the cross flange. Gin pole should not obstruct operation of any valve.
Then it must be securely chained and boomed.
The Gin pole is then extended ensuring that the extended sections are securely pinned to prevent sudden retraction when loaded with the lubricator weight.
The lubricator pulley should be maintained at ground level and then connected to the clamp in the lubricator.
The lubricator complete with stuffing box and tools is then hoisted by pulling the free end of the rope. The lubricator is hoisted to its vertical position above the BOP next the floor block is shackled to the weight indicator transducer. The weight indicator transducer is chained securely to the tree. The floor block should be close to the foot of tree.
With the floor block in place, the wire is passed through it and the wire is tensioned by wire line unit taking up the slack wire. The wire line clamp is removed carefully. The bore of the lubricator is then pushed off centre by the helper so that the gentle release of the break on the unit will lower the string to the tubing hanger flange and odometer on the unit is made Zero-Zero.
The tools for the particular wire line job to be under taken are attached to the bottom of the standard string of tools. The complete set of the tools are raised into the lubricator and the end of the lubricator is lowered into the top of BOP and self aligning union is made up. The bleed valve is slowly opened ensuring no sudden pressure surge is placed in the lubricator. When the pressure is equalized between tubing and lubricator, the master valve can be opened rapidly. At this point high lubricating oil is applied to the wire on the spool and also the wire leading up to floor sheave- this lubricates the stuffing box packing facilitating easy passage of wire.
At this point weight indicator should be adjusted to Zero. Going down the hole should be steady, keeping watchful eye on weight indicator. The unit should be braked immediately at the point of any obstruction so as to avoid coiling up or kink in the wire. The weight of the string of tools should be accurately noted before latching on any fishing neck in the mandrel or D-nipple. Loss in weight or gain in weight gives an indication whether the equipment is set in the nipple or retrieved out of the nipple. Any substantial loss in weight is alarming as it indicates loss of complete or part of the string of tools.
WIRELINE WINCHES
Wire line winches generally use the hydraulic circuit and are packed in two separate sections. One skid contains wireline reel and controls, and other section diesel engine, hydraulic pump and tanks. The hoses with quick couplings connect the two sections.
To operate the unit proceed as follows:
1. Place control valve in stop position.
2. Move reel select lever to the front or rear position as desired.
3. Shift 4-speed transmission to desired gear.
4. Release the brake lever from reel being used.
5. Control forward or reverse movement of the selected reel by mean of reel control valve.
6. Adjust tension on wireline by means of system pressure knob on panel. This relief valve can be set at a low pressure and then the wireline can be fed into the hole which operator maintains the control valve in “up” position. The control valve works as an effective brake system and the operator can slowly increase the system pressure setting as more wire feeds into the hole.
7. Adjust engine throttle to suit load conditions.
Truck Mounted Wire-line Unit
• Slick line units designed and built for all sizes of wire such as 0.082", 0.092", 0.108" and 3/16" diameters.
• Steardy pipe cage with compact and heavy-duty base skids and suitable lifting eyes.
• Line speed available from 2700 ft/min at surface to 1200 ft/min. at 20,000 ft.
Also, line pull available from 2800 lbs at surface to 5500 lbs at 20,000 ft.
• Smooth and reliable hydraulic open and closed loop system as per customer's choice.
• Level wind feature allows the operator to guide incoming line evenly on the reel.
• Pressure compensated hydraulic control to maintain the drum R.P.M. at varying loads.
• Precision RPM control from the operator console.
• Pressure compensation feature which ensures that line speed will remain same regardless of changes in load.
• Isolating valve in the suction line for trouble free maintenance.
• Suitable relief valves provided in the hydraulic system to avoid accident.
• Fail safe break to stop the drum automatically in the event of any failure in the hydraulic system or engine shut down.
• Triplex roller chain drive for smooth transferring of power to the reel drum.
• Single lever system for raising, lowering or stopping in the well if required.
Positive breaking of wireline tool is effected when the operation lever is in neutral position.
• Lock system to keep drum in steady position for long time in lowered condition of instrument.
• Quick release coupling for easy mounting of hydraulic hoses.
• Dual brake band to act on both sides of the drum which can be operated by hand or by foot as the convenience of the operator.