November 07 1

DRIVE HEADContentsVH100

V3 ManifoldBack-spin

Assembly processVH60

Oryx Seal

November 07 2

DRIVE HEAD

• Hold the rod string connected to the rotor

• Drive the rotation of the rotor

• Prevent back spin rotation

• Sealing around the polished rod between low pressure at the BOP outlet and outside’s atmosphere above the stuffing box.

Pulley-Belt

Motor

Bearing housing

Sealing

IBOP

Flow-tee

Well head

Rod string

Rotor

M

November 07 3

Kudu’s Drive Head

VH-60VH-100

100HP 11.6T 60H 8T

November 07 4

Others

Netzsch

Oil liftHydraulic engine

R&M Energy

Weatherford

November 07 5

Stuffing box

Bearing assembly

Well Head

Motor

Manifold

November 07 6

KUDU VH-100

Manifold V3

Stuffing box

Bearing assembly

Brake device

Flange fixed on the Well Head

Pulley-Belthousing

November 07 7

Stuffing box

Bottom bushing bronze

Seal

Ring lantern

Gland Packingretainer

Packing

Seal

Cap

Grease hose

• Watertight around the polished rod

November 07 8

Stuffing box

The cap

Grease hose

Packings

November 07 9

Drive Head

Radial thrustbearing

Axial bearing

Gear

Hex clamp

Hex shaft

Polished rod

Rotor brake

Pulley

Gear Pump

Manifold

Housingbearing

Radial thrustbearing

November 07 10

The drive head components

November 07 11

The drive head

November 07 12

The coverplate

November 07 13

The coverplate

Rollers assembly of upper radial bearing

Upper lip seal (nitrile)

Bolts

November 07 14

The rotor (brake)

November 07 15

The rotor (brake)

Brake pad

Rotor

Spacefor key stock

November 07 16

The brake device

November 07 17

The brake deviceTubes assybrake pressure& return

Brake pad

The oil pressureweights down the brake pad on the rotor

Wear indicator

November 07 18

The shaft

November 07 19

The shaft

Thrust axial bearingRollers assembly of lower radial bearing

Hollow shaft

November 07 20

The shaft

Gear for oil circuit

Set of the thrustbearing on the shaft

November 07 21

The thrust washer

November 07 22

The thrust washer

The thrust washer

Gear for oil circuit

One way (shaft clockwise) for lubingthe drive heads and the other forcompressing the oil brake circuit

November 07 23

The lip seals

November 07 24

The lip seal

Lowerlip seal

November 07 25

The manifold

November 07 26

The manifold V3

Hoses to thegear pump

Filter

Gear pump

Lubrication

Anti back-spindevice

Forwardmode

Back spin mode

Forwardmode

Back spin mode

For dispatching and cleaningthe oil

November 07 27

Test button

November 07 28

Back Spin

Initial state During production,Fluid level in annular decreases

Inside the tubing the fluid rises until the well he adRod string acts like a spring and store energy

Fluid w

eight

Torque due to the rod string twist

Production Stops

Nominal Torque

November 07 29

Back spin

• There’s a counter torque led by the liquid column weight and the rod string twist. When the Drive head stops for maintenance or otherreason, this counter torque has to be refrained to prevent a dangerous “back-spin”.

• However we need to release this energy to secure the area and enable any work on the well. This is the purpose of the back-spin device.

• The brake of the Drive head is driven by the pressure generated by the auxiliary pump spinning backwards. When the pump stops, the rod string starts spinbing backwards, the generated pressure by the auxiliary pump rises and the pads start to press on the brake disc. Then the backwards rotation decreases and the pressure on the pads is released.

• Thus the energy is slowly released.

November 07 30

Drive head assembly process

• 1) Fix the thrust washer in itslocation inside the drive head

• 2) Put the shaft on the thrustwasher, the gear for oilcircuit from shaft have to lead the gear from drive head

• 3) Thread the coverplate on the shaft and screw down the coverplate

1)

3)

November 07 31

Drive head assembly process

• 4) Put the key stock on theshaft on its location

• 5) Thread the rotor on the shaftand block it in rotation with thekey stock

• Add lube oil if the thread ishard

• Don’t thread the cap right to the end, let some space for inserting the brake device

5)

November 07 32

Drive head assembly process

• 6) Put the brake pad in thebrake device in its location andinsert all on the rotor

• 7) Thread down the brakedevice on the drive head anddisplace the rotor in the sametime

• 8) Don’t forget the wedges

7)

8)

November 07 33

Drive head assembly process

• 9) Put the manifold in itslocation and thread down itson the drive head

• 10) Connect all the lube oiltubes

9)

10)

November 07 34

Drive head assembly process

• 11) Put the oil gauge on itslocation, don’t forget theo’ring

• 12) Thread down thestand for pulley belthousing

11)

12)

November 07 35

Drive head assembly process

November 07 36

KUDU VH-60

Oryx Seal

Bearing assembly

Brake device

Flange fixed on the Well Head

Pulley-Belthousing

November 07 37

November 07 38

Oryx Seal

Accumulator(used as well for lubrication)

Pressure gauge

Articulated rotating assemblyAllows packing bore to follow the

Polished rod movement

Oryx ClampEnsure that rotating assemby rotates

with Polished rod

Oryx Packing Nut

Bearings

November 07 39

The polished rod is clamped there

This shape tightens theretainer on the rod

Rotates alongwith the

polished rodRope packing

Fixed part

Seal

Bearings

Lubricantunder lowpressure

This shape tightens theretainer on the rod

Spring

Rope packing

Seal

Rotates alongwith the

polished rod

Bushing bottom bronze

November 07 40

November 07 41

Pressure gauge

Accumulator

Pressure 1 – Pressure 2

2

1

Initially equals to ZeroPressure rise -> leak in the bottom part

Oil drain & pressure set using the valves 1 & 2

Groove to disablerotation

November 07 42

November 07 43

Gear pump

Break unit

Lub unit

Inner gearfixed to the

shaft

Outsidegear

Lub andbrake pump

Backward

Forward

November 07 44

Bearing housing

Hollow Shaft

Radial Thrust Bearing

Axial Bearing

Pump

Radial thust bearing

Ring

Seal

Gear for speed mesure

Tachymeter

Breather

November 07 45

November 07 46

Brake Device

Pads

Groove for wearindication

Ventilated brake