drilling with casing 04

8/22/2019 Drilling With Casing 04

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13-3/8BBL

DrillShoeDS133170HDZ

Recommended Running Procedure

07March02

General Information and Recommendations

The central portion of the nose of the tool is constructed from aluminium alloy, which is fully

drillable with any type of oilfield drill bit. This is set with a combination of small Thermally Stable

Diamond cutting elements and high density, HVOF tungsten carbide on the front of the blades.

The outer flanks have PDC cutters.

This tool is very aggressive and will drill quickly with low WOB. Aggressive Drilling Tools can

generate high torque for low weight. It is recommended that WOB be kept to a minimum until

the torque response of the DrillShoe is known.


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On no account should the tool be set on bottom unless

full pump rate and rotation have been achieved.

Preparation Prior to Running

Unpack the tool and make the following checks:

Check and record the serial number, tool size and type Confirm no damage to aluminium nose or cutting structure Check that the ports / nozzles are clear Remove thread protector and check for damage Confirm that there is no debris inside the toolMaking-Up to the Casing Drilling String

Stand the DrillShoe box-up on a rubber mat or wooden board Clean and dr connections to be made p


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Initiating the Drilling Process in Open Hole

Run the casing and drill shoe conventionally until you reach 10-30 feet above the mudline

Install water head bushing (cross over sub) Pick up one stand of drill pipe and make connection to waterhead 31 x 3 = 93 plus

water head bushing 3 = 96 feet bushing (cross over sub) and top drive, (or connect

directly from the casing to the water head bushing to the top drive)

Start pumps to 850-1200 GPM and note the pressure before the drill shoe reachesbottom.

Pump at high flow rate Bring rotary speed up to 30-40 RPM and begin rotating slowly until you reach the mud

line

Zero the weight indicator, record pump pressure and torque Run down slowly to tag bottom, carefully monitoring WOB, torque and pressure Tag

bottom lightly and start to drill as normal with low weight 1 - 2k and RPM 30 - 40 for

the first 20 30 feet until a bottom hole pattern is established

It i d d th t th first fe metres or one joint be drilled do n ith


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On no account should the tool be set on bottom unless

full pump rate and rotation have been achieved.

Drilling Ahead

Always kick in the pumps and rotate before going to bottom Reset weight indicator to zero. Increase weight gradually to achieve desired ROP Use low weight on Drill shoe 2-5K Remember that excessive WOB will reduce tool

life Monitor pump pressure carefully, an increase may indicate bit balling. Pick up off

bottom, rotate at max rpm, and stop and start the pumps several times to try to wash the

DrillShoe clean of cuttings, pump high viscosity pill 10 barrels to clean cutting structure

Drill down the first joint of casing as per normal drilling to leave a small rat hole when theslips are set, (this is to have some space for cuttings to settle without blocking the jets)

M ki ti


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Weatherford Casing Drilling Spear Assembly

Operational Procedures for 13 3/8 Drillshoe

1. Run in hole with Shoe Joint and casing as per casing running procedures onejoint before drill out point.

2. Pick up Casing Drilling Spear Assembly with pick up line. Lower Casing Drilling Spearassembly into casing joint in the rotary table. Stop Ring on spear will land out on the

casing collar.

3. Make up Casing Drilling Spear Assembly to the Top Drive System. Use normal make-up torque for this connection.

4. After make-up of Top Drive, slack off to ensure stop ring is landed out on top of casingcollar. Turn the Casing Drilling Spear Assembly +- turn to the left (until the stop ring

b i t t ) t t i l iti


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11.Start drilling down casing. Special caution should be taken for the first 2 or 3 joints ofcasing. Casing joints should be back reamed as hole conditions dictate.

12.The first 1-2 joints should be drilled with low RPM 30-40 and low weight 2-4 K13.After drilling in the first 1-2 joints WOB should be increased to 5-10K and RPM

increased to 50-80 RPM

14.The optimal parameters will probably be 50 RPM and constant WOB of 5K.15. The design of the drillshoe does not lend itself to High RPM and WOB, this will only

cause premature wear and slow ROP.

16.Caution: Elevators should be unlatched and pulled free of rotating casing while drillingcasing down.

17 O j i t f i h b d ill d d S t li l k ff t t i i


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Important Note

Dependent on the type of float being used the casing can hold a large volume of air that can

be circulated after each connection, when this is pumped through the system it may appear

to be gas circulating up around the outside of the casing each time it comes to the surface.

The preferred option is a float collar that allows the casing to be completely filled after each

connection; this will alleviate the air bubble that inhibits cooling and cutting removal and the

possibility of unloading the backside of the casing.

The limiting factor of drilling with casing is the drilling torque should never exceed the make

up torque of the casing.

To obtain the best performance try and maintain a torque figure of 5K while drilling,

however in most cases the normal parameters listed below should be tried first.


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Normal Drilling

RPM 40-60

WOB 5 - 7.5 K

Torque less than make up torque of casing

GPM 800 - 1200Pressure drop 500 - 1200 PSI

Hard Drilling

RPM 30-50

WOB 7.5 - 10 K

T l th k t f i


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Make up procedures

The connection was coated with epoxy and screwed into place


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Making up the drill shoe


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Making up float collar


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Running in the hole


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Locking bushing


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DS133170HDZ13-3/8x 17 DrillShoe SpecificationsOD 17 (432mm)

Casing Size 13-3/8 (340mm)

Connection As per Purchase Order

Casing Weight As per Purchase OrderCasing ID As per API 5CT

Casing Drift As per API 5CT

Length 2.31 ft (705mm)

Tool Weight 425 lb (193kg)

Shipping Weight 512 lb (233kg)

Number of Blades 3Number of Nozzles 6

Cutting Structure (on Nose) 340 off 3mm Thermally Stable Diamond cubes

Cutting Structure (on Body) 18 off 13mm PDC Discs

Gauge Length 12 (305mm)

Gauge Protection QuikTip Tungsten Carbide Brickettes

TFA As per nozzle selection2 2


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drilling with casing 04

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