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CDS Lower Drive Assembly:External Drive AssemblyWhen the APPLY function is used, the actuator applies force against the connection collar,
which pushes against the push/pull collar. This applies pressure to the links, which are connected to the slip segments. The links move down, radially contracting the slip segments to
engage the dies onto the outside diameter of the casing. When the casing is gripped by the
CDS, it may be rotated, reciprocated or circulated.
When the RELEASE function is used, the actuator applies force in the opposite direction and the slip segments pull away from the casing
Internal Drive Assembly (ICDS)When the APPLY function is used, the actuator applies force to the connection collar, which pushes against the split collar. This in turn moves the grapples down, which expands the slip segments radially to engage the grapples onto the inside diameter of the casing.
When the casing is gripped by the CDS, it may be rotated, reciprocate or circulated.
When the RELEASE function is used, the actuator applies force in the opposite direction and the grapples pull away
the push/pull collar applies pressure to the links, which are connected to the slip segments. The links move down, radially contracting the slip segments to engage the dies onto the outside diameter of the casing
Dies sit inside of the slip segments. when the actuator applies the links move down, radially contracting the slip segments to engage the dies onto the outside diameter of the casing.
Mud Saver Function and Operation: mud saver valve is designed to reduce or eliminate the undesirable loss of fluid when making a connection and to save the rig time lost waiting for the Kelly hose to drain.
Placed inside of the Spear or Mandrel, the mud saver valve opens from pressure when the rig pumps are engaged, enabling circulation down
the drill string. The valve closes when circulation is stopped, trapping
the drilling fluid inside the CDS and Kelly hose, thus making drill string trips drier, faster, and safer.
The care and servicing by qualified personnel for the purpose of maintaining equipment in operating condition (must be performed before/after every job).
During the preventive maintenance must Inspect Test and Lubricate the following CDS Components:
• Threads
• Grapples (Underside) Internal CDS (ICDS)
• Slip Segments (Nipple on the back Side) External CDS (ECDS)
• Actuator Upper Bearings
• Actuator Lower Bearings
• Link Tilt Carrier
• Link Tilt Cylinders
• Low/High Actuator Pressure Test
• Spear
• Spearhead
• Service Loop
• HPU
• Shackles
• Elevators
• Control Panel
When the servicing for the external drive system is complete, reconnect the actuator and lower drive assembly.Label how much torque has been applied to tighten the connection.Ensure the spline lock is installed.
Corrective Maintenance:Can be defined as a maintenance task performed to identify, isolate, and rectify a fault so that the failed equipment can be restored to an operational condition.
Components that must checked for damage:
• Connection Collar and cut-outs
• Push/pull Collar
• Slips Links
• Slips Segments
• Dies/Grapples
• Actuator
• Spearhead
• Packer Cup
• Bolts and Miscellaneous
• External body/Mandrel
• Spear
• Crossovers
• Service Loop
• Control Panel
• HPU
To ensure the equipment operates properly and to prevent downtime, check the pressure and temperature gauges, all fluid levels, and flow meters daily.
When the lower drive assembly is shipped from the manufacturing shop, it is not tightened.
When it reaches its destination it must be tightened before operations begin. Ensure the mandrel is installed and the connection is correctly torqued, and that the spline lock is installed.
If the CDS will be used for drilling applications, ensure the torque limiting link tilt assembly (TESCO part number 860196 adjustable or 860195 non-adjustable) is installed.
Crossover Sub: Visually inspect the top and bottom connection threads and the bore for wear and
Corrosion
Die Lock Clamp: Visually inspect the dies for damage. Visually inspect the clamp body for damage, distortion or corrosion
It is CRITICAL that the actuator and the lower drive assembly (both internal and external) be tightened to a torque of 46,000 ft-lb (62 367 N·m) before the equipment is operated
Operational Maintenance during operation / Lube schedule:
Actuator Grease Application:
Caution: Do not pump too much grease into the bottom grease nipple; the spring chamber could fill with grease. Over time, this will hinder the operation of the actuator.
The two CDS levers must be used at the same time to operate the tool; the levers are moved in opposite directions. This procedure also applies to the levers for the slips and the elevators
Caution: This safety feature is required for all CDS control panels. It is prohibited to try and change the fluid sequences that alter the position of the levers
The internal drive assembly is available in several sizes. These smaller sizes have nine grapples:• 4-1/2 in.• 5-1/2 in.These larger internal drive sizes have five grapples:• 7 to 7-5/8 in.• 9-5/8 to 11-7/8 in.• 13-3/8 in.•16 in.• 18-5/8 in.•20 in.Both the five-grapple and nine-grapple internal casing drive systems are assembled in the same way. For illustrations of the part names used in this chapter, refer to the Casing Drive System Parts Lists that was shipped with the unit.
• Cycle the actuator into the open position. This will expose the pin-end of the actuator.• Apply thread compound to the pin-end of the actuator.• To ease further assembly, attach the mandrel to the pin-end of the actuator.
• Use a make-up/break-out tool to tighten the connection between the mandrel and the actuator with 46,000 ft-lb (62 367 N·m) of minimum torque. The limit however should not exceed 63,000 ft-lb (85 420 N·m).
Warning! The make-up/break-out tool must meet torque requirements. Qualified personnel ONLY are to operate the make-up/break-out tool
• Grease all slide areas of the mandrel with grease.• Prepare the grapples for installation. The 4-1/2 in. and 5-1/2 in. sizes require nine grapples; all other
sizes require five grapples. To prepare the grapples:• Ensure that the required number of grapples are available to be installed.• Ensure that the weight of the grapples corresponds correctly with the weight of casing.• Ensure that all the grapples are part of the same set by checking the serial numbers; the numbers
should be sequential
Warning! The larger size grapples (i.e. 9-5/8 in. and larger) are extremely heavy. Use proper lifting techniques and overhead equipment as needed to move them
• Insert the top of one grapple into the cut-out on the mandrel.• Slide the grapple under the bumper until the ramp profile on the back of the grapple rests evenly
against the corresponding ramp profile on the mandrel.
• Before connecting the drive to the actuator, remove the lock collar and cover the splines on both the actuator and drive with Kopr-Kote. Replace the lock collar as shown
• Make-up the connection between the drive and actuator.• Place the CDS actuator and the mandrel (or body of the external tool) on top of the Breakout Vise as
• Ensure the splined connecting lock collar is in position as shown in the following figure. • Use wire to secure the lock collar in place as shown in the following figure. This will keep it out of the
• Ensure the splined connecting lock collar is in position as shown in the following figure. • Use wire to secure the lock collar in place as shown in the following figure. This will keep it out of the
way during the torque-up procedure.
Use the standard make-up procedure as described in the “Make-up of Tool” section of the Breakout Vise manual
• If the lock collar they are aligned it should slide easily over the splines on the mandrel or external . .drive body. If this happens, this procedure is complete.
• If they are not aligned, note how much they will have to move to become aligned.• The following figure shows splines out of alignment.
• The splined connecting lock collar has two ears, one on each side. Attach two bungee cords, one to each ear. Ensure the tension created by the bungee cords will pull the splined connecting lock collar towards the mandrel or drive body when the splines are aligned.
• Install the second half of the split collar. Again, ensure that the roll pin on the split collar aligns evenly with the roll pin on the actuator.
• Install four 1/2 in. Hi-Collar lock washers and four 1/2 in. × 1-1/2 in. caps crews onto the split collar to join and lock the two halves together. Apply 75 ft-lb (101.69 N·m) of torque to tighten the caps crews.
• Install the second half of the connection collar.• Install four 1/2 in. Hi-Collar lock washers and four 1/2 in. x 1-1/2 in. caps crews onto the connection
collar. Apply 75 ft-lb (101.69 N·m) of torque to tighten the caps crews.• Install four cotter pins into the connection collar below the four caps crews
• Ensure that the spearhead is clean and free of any debris.• Install one N90-231 O-ring onto the spearhead.• Install a protector sleeve onto the spearhead.• Install a retaining ring onto the spearhead.• Apply a light film of grease to the spearhead and the protector sleeve.• Slide a packer cup onto the spearhead.• Slide a seat onto the spearhead. • Install two remaining N90-231 O-rings onto the spearhead. • The spearhead is now assembled and ready to be connected to the mandrel
IMPORTANT: we strongly recommend the continued usage of TESCO ULTREX lubricants, unless otherwise specified.
• Thread the spearhead assembly onto the mandrel.• The threads of this connection are very fine. Take special care not to misalign the connection and
damage the threads.• Use mechanical aid on any spearheads larger than 7 in. as they are too heavy to move by hand.• Insert a long bar through holes on bottom of the spearhead to tighten the spearhead assembly to the
mandrel. Apply 600 ft-lb (813.49 N·m) of torque to tighten.
Note: To calculate the torque, multiply the length by the force. For example, to achieve 600 ft-lb of torque on the spearhead, insert one end of a 6 ft. long bar through the holes on the bottom of the spearhead and apply 100 lb of force to the other end of the bar
• Place one spring plate on top of the slip; align the dowel holes.
• Place one retainer onto the top of the spring plate.
• Install four 1/2 in. hi-collar lock washers and four 1/2 in. × 1-3/4 in. caps crews through the retainer and the spring plate and into the slip. Apply 75 ft-lb (101.69 N·m) of torque to tighten the caps crews.
• Use eight 1/2 in. × 1-3/4 in. caps crews and eight 1/2 in. lock washers to secure the torque arrest block to the inside of the body. Apply 75 ft-lb (101.69 N·m) of torque to tighten the cap screws.
• Repeat Step for each of the two remaining torque arrest blocks.• Insert one snap ring onto each one of the cap screws that are securing the three torque arrest blocks.
Ensure that the flat edge of each snap ring is facing the outside and that each snap ring is seated properly.
• Feed a rope down through top of the body and attach one end to the top of one link
• Pull this rope to install and guide the slip into place inside the body.
• Remove the rope from the link.
• Repeat steps for each of the remaining two slips.
• Install three link pins through the holes in the push/pull collar and through the corresponding holes in each of the three links to secure the links to the push/pull collar.
•• Install three cotter pins into the three link pins. Insert the bumper into the body.
• Install two O-rings N90-2-339 onto the top of the mandrel.
• 2. Thread the mandrel into the body and apply 800 ft-lb (1084 N·m) torque to tighten.
Caution: Do not exceed 1,500 ft-lb.Caution: The threads on the male end of the mandrel are very fine. Use caution when pushing the mandrel through the bumper and into the body.Caution: Use mechanical aid on any spearheads larger than 7 in. as they are too heavy to move by hand.
• Thread the spearhead assembly onto end of the mandrel.
• Apply 600 ft-lb (813 N·m) torque to tighten the spearhead assembly to the mandrel.
Note: To calculate the torque, multiply the length by the force. For example, to achieve 600 ft-lb of torque on the spearhead, insert one end of a 6 ft. long bar through the holes on the bottom of the spearhead and apply 100 lb of force to the other end of the bar.
WARNING ! ONLY QUALIFIED PERSONNEL MAY OPERATE OVERHEAD EQUIPMENT.
WARNING ! SOME COMPONENTS OF THE CDS ARE EXTREMELY HEAVY. WHEN LIFTING USE: 1) PROPER LIFTING TECHNIQUES
2) OVERHEAD EQUIPMENT AS NEEDED (RATED APPROPRIATELY FOR TASK)
CAUTION : THE THREADS ON THE MANDREL/SPEARHEAD CONNECTION ARE VERY FINE. TAKE CARE NOT TO MISALIGN THE CONNECTION AND DAMAGE THREADS.
WARNING ! THE LINK TILT ASSEMBLY IS DESIGNED TO LIFT A SINGLE JOINT OF CASING, IN CERTAIN CASES THE LINK TILT ASSEMBLY CAN BE USED TO HOLD LOADS WITH A MAXIMUM
CAPACITY OF 10,000 lbs. USE EXTREME CAUTION
WARNING ! USE EXTREME CAUTION WHEN CHANGING SLIPS IN THE LOWER DRIVE ASSEMBLY AS HYDRAULIC FORCE LINGERS INSIDE ASSEMBLY. DO NOT PLACE HANDS INSIDE HOUSING.
DANGER ! ENSURE THAT ACTUATOR HYDRAULIC OPEN PRESSURE IS SET PROPERLY (700- 800 PSI). THIS WILL ENSURE THAT THE ACTUATOR DOES NOT OPEN ACCIDENTALLY.
KEEP RELEASE PRESSURE AS LOW AS POSSIBLE
WARNING : BEFORE BEGINNING OPERATION, REALIZE THAT THERE ARE LIMITS TO ALL PIECES OF EQUIPMENT INVOLVED IN THIS OPERATION: CROSSOVER SUB, TOP DRIVE SLIPS, CASING SIZE, GRADE, ELEVATORS, etc. CAREFULLY CONSIDER ALL LIMITING FACTORS BEFORE BEGINNING.
WARNING ! THE SLINGS AND SECUREMENTS USED TO LIFT THE CDS MUST BE CERTIFIED AND HAVE THE APPROPRIATE LOAD RATING. ENSURE THE CDS IS BALANCED AND LEVEL WHEN IT IS LIFTED.
WARNING ! ATTACH CERTIFIED SLINGS AND SECUREMENTS TO THE PROPER PAD EYES ON THE TRANSPORT STAND WHEN USING OVERHEAD EQUIPMENT.
WARNING ! SLIP SEGMENTS OF EXTERNAL DRIVES AND LARGE GRAPPLES OF INTERNAL DRIVES ARE EXTREMELY HEAVY. USE A SLIP SEGMENT WINCH OR A TUGGER MUST BE USED TO REPLACE THESE COMPONENTS. USE PROPER LIFTING TECHNIQUES AND OVERHEAD EQUIPMENT AS NEEDED TO MOVE THESE COMPONENTS.
BEWARE : DURING RIG UP, ENSURE THAT THE CONNECTION COLLAR ROTATES WITH THE TOP DRIVE. OTHERWISE THE GRAPPLES AND SPLIT COLLAR WILL WEAR PREMATURELY.
CAUTION : IF RETAINER RING IS INSTALLED, DO NOT REVERSE HOSES WHILE CDS IS IN WELL BORE.
CAUTION : THE FUNCTION TEST OF THE ACTUATOR MUST NOT BE DONE IN WELL BORE.
CAUTION : AS PER LUBRICATION SECTION OF THE MANUAL, IT IS CRITICAL TO GREASETHE BACK OF THE GRAPPLES EVERY TENTH JOINT. IF GREASE IS NOT APPLIED AND THE TOOL IS ALLOWED TO RUN DRY, THE FRICTION MAY CAUSE THE GRAPPLES TO STICK TO THE MANDREL AND THE TOOL WILL NOT RELEASE.
CAUTION : THE CROSSOVER SUB WHICH CONNECTS THE CASING DRIVE SYSTEM TO THE TOP DRIVE IS CONSIDERED OVERHEAD EQUIPMENT. DO NOT CONFUSE CROSSOVER SUB WITH OTHER SUBS FROM THE TOP DRIVE. DO NOT USE TOP DRIVE SUBS.
CAUTION : CHECK THE LOAD RATING OF THE SINGLE JOINT ELEVATORS BEFORE OPERATING LINK TILT.
CAUTION : ON LINK TILT ASSEMBLY, USE ONLY CERTIFIED SHACKLES AND CERTIFIED OVERHEAD EQUIPMENT.
WARNING ! IT IS THE RESPONSIBILITY OF THE CASING DRIVE SYSTEM SUPERVISOR TO DELIVER OPERATION INSTRUCTIONS AND BE ON THE DRILL FLOOR AT ALL TIMES DURING CDS OPERATION.
DANGER ! THE ACTUATOR IS UNDER SPRING PRESSURE. USE EXTREME CAUTION WHEN ASSEMBLING OR DISASSEMBLING THE ACTUATOR.
DANGER ! USE PROPER FALL PROTECTION WHILE WORKING AT OR OVER 6 ft. ABOVE THE FLOOR.
Use the following as a checklist for common rig up and operational problems:
• Check that the cross over sub diameter is such that it will fit through the grabber box opening.
• Ensure that the cross over sub is long enough to clear the top of the grabber box.
• Verify that the bolt holes on the anti-rotation bracket will align with the bolt holes on the bottom of the grabber box once the pipe guide is removed.
• Make sure you have the proper connection lock clamps available.
• Make sure the hydraulic fittings are compatible from the drive to the actuator. e.g.. (non Tesco top drive)
Rig Down Into the Transport Stand on the Rig Floor.• Position the links to touch the rig floor and remove the elevator from the links.
• Shorten the links and take out the pins, then shorten the links with the help of other crew members (minimum three rig personnel) to the shortest distance possible.
• Re-install the pins and ensure the pins are in the correct position and tight enough so that they do not become dislodged.
• Set the slips on the casing.
• Function the tool to release the casing, then extract it from the casing.
RIG DOWN:• Lift up the top drive / CDS to acceptable working height above rig floor level.
• Lift the rig-up stand / frame to the rig floor.
• Place the rig-up stand / frame in the vertical position.
• Lower the CDS to its rig-up stand / frame.
• Push the frame towards the CDS.
• Lock the clamps, ensuring they are properly secured and tightened.
• Break out the CDS from the top drive by disconnecting the CDS crossover sub
Note: The links may swivel as the anti-rotation bracket and safety slings have been removed. Take caution and avoid being too close to the links.
Note: The rig-up stand / frame should be placed on bars / beams / pipesNote: Ensure the CDS is fitted to its frame and ensure the CDS fits the grooves on its clamp.
RIG DOWN in the Rotary Table or the Casing Stump:• Install the final casing joint (job is finished).
• Ensure the rig floor is clean and free of any obstruction, debris, tools or equipment that may cause a tripping hazard or slip hazard.
• Function the link tilts to the FORWARD position while lowering the CDS to the rig floor.
• Set the slips on the casing.
• Remove everything attached to the anti-rotation bracket.
• Remove the anti-rotation bracket and safety slings attached to the top drive.
• Position the links to touch the rig floor.
• If extendable links are used, shorten the links and take out the pins, then shorten the links with the help of other crew members (minimum three rig personnel) to the shortest distance possible.
• Re-install the pins and ensure the pins are in the correct position and tight enough so that they do not become dislodged
RIG DOWN in the Rotary Table or the Casing Stump:• Function the tool to release the casing, then extract it from the casing.
• Break out of the connection to the top drive and leave the CDS tool in the stump of the casing or on the C plate in the rotary table.
• Hoist the top drive out of the way and install a lifting nubbin into the top of the tool.
• Attach rig hoisting equipment (tugger line or crane line).
• Hoist the CDS tool out of the casing and install a lay down line through the single joint elevators with sling to grapples OR to the external body area.
• Clear the area for unnecessary personnel as the CDS may swing or links may swivel. Take caution and maintain a safe distance.
• Stop the HPU, and disconnect the hydraulic hoses from the CDS. Release the pressure on the hoses by moving the lever on console. Ensure no object can drop during lifting or lowering.
• At the same time, pull the CDS tool out the V-door and lower the rig hoisting equipment, laying the tool into the transport stand or on the catwalk for later removal for transport.
RIG DOWN in the Rotary Table or the Casing Stump:• Secure the console, hoses and other equipment in a safe position.
• Lift the CDS and place on a transport stand / frame on another location.
• Position the CDS so that it is fitted to its frame and the CDS fits the grooves on its clamp.
• Lock the clamps or ratchet straps and ensure they are properly secured and tightened.
• Remove the lifting sub / nubbins from the CDS.
• Place a thread protector on the CDS.
• Attach two leg slings on the frame pad eyes.
• Position the CDS and transport frame in a location where it will be easy to lift
Note: In conditions when the links are not completely fitted to their lock frame, use the bypass hose to lower the links by releasing pressure in their cylinders
Retract the cylinder to tighten the connection between the tool and the actuator. Monitor the pressure gauge on the hydraulic source to tighten the connection to the required torque.
Warning! Monitor the pressure gauge on the hydraulic source: Ensure that the torque does not exceed the maximum torque when tightening components of the tool.
If operating the Casing Drive System in a cold environment, consider the possible effects of ice and snow on the equipment.
• If there is any ice on the outside of the casing when using the external lower drive assembly, the dies might slip.
• If the dies slip while a connection is being tightened, the surface of the dies will be scrubbed prematurely.
• If ice has accumulated on the dies, they might slip while being picked up on the hook load. Consequently, they could slide in the connection collar and possibly damage the slip segments.
• Use caution during operation if a joint in the rotary table is over-filled and mud is frozen to the outside of the joint.
If working with a CDS in a dirty environment, be sure to take the time to clean the dies.
• Clean away any excess grease build-up and/or varnish on the outside of the joint.
• If the dies slip while a connection is being tightened, the surface of the dies will be scrubbed prematurely.
• If debris has accumulated on the dies, they might slip while being picked up on the hook load. Consequently, they could slide in the connection collar and possibly damage the slip segments.
Use a paint marker to make it easier to use the CDS both during daytime and nighttime operation. Additional lighting may be required for night time operation.
• Apply a paint mark on the outside of the casing to make it easier to stop the lower drive assembly at the right place before energizing.(i.e., the casing should be touching the stop bumper).
Apply the mark to indicate the point at which the elevators should stop (approximately 80 in. on the external lower drive assembly. The distance between the stop bumper to the bottom of the external lower drive assembly is 41 in.). Refer to Figure on next slide.
• Apply a small amount of paint to the connection collar of the internal lower drive assembly to make it easier to see at night.
Stuck GrapplesIf the grapples become stuck, unscrew the internal CDS from the stump.Follow the procedure below:
1. Put a thread protector on the bottom of the joint.
2. With just the single joint of casing in the CDS, set the RELEASE pressure on the hydraulics to 1500 psi.
3. Confirm that the RELEASE lever is in the RELEASE position.
4. Gently spud the casing joint into the floor; very little force is necessary.
5. If the joint is shouldered up against the stop bumper, cut away the rubber on the stop bumper. If the joint is not shouldered up, go to the next step.
6. Release the CDS and lay the joint down.
7. Inspect the lower drive assembly and the joint for wear and/or damage.
8. Apply grease to the back of the grapples.Ref: TP-L&D-6.2.2-41 Rev 0
If the grapples do not retract fully on the up-stroke, inspect the CDS to isolate the cause.
To temporarily resolve the problem, install an O-ring around the grapples at the die area.
Alternatively, if no O-rings are available, apply a few lengths of electrical tape around the grapples at the die area. This will ensure that the grapples remain tight until the CDS can be inspected and/or serviced..
Caution: After completing cementing operations, trapped pressure inside the casing may prevent the actuator from retracting the grapples or dies. This may appear to the operator as actuator failure.
ECDS Actuator FailureIf the actuator fails during a job with the external lower drive assembly and it cannot be removed, follow the procedure below.
1. Set the casing in the slips.
2. Reduce the weight of the drive assembly on the casing.
3. Remove the connection collar.
4. Place a sling around the push/pull collar.
5. If possible, lower the drive assembly while pulling up on the sling. If the drive assembly cannot be lowered, pull up on the sling; keep the actuator level.
6. The slips should pull to the RELEASE position. If they do not pull into the RELEASE position, remove the link pins and lift up on one slip segment at a time.
7. Lift up on the drive assembly and the sling simultaneously.
8. Slack off on the sling to allow the grapples to resetRef: TP-L&D-6.2.2-41 Rev 0