PROGRESSING CAVITY PUMP SYSTEMS - National Oilwell Varco

PROGRESSING CAVITY PUMP SYSTEMS

PROGRESSING CAVITY PUMP SYSTEMS
One Company, Unlimited Solutions
Since 1841, National Oilwell Varco® has been dedicated to ensuring customers receive the highest quality oilfield
products and services. National Oilwell Varco is a worldwide leader in the design, manufacture and sale of equipment
and components used in oil and gas drilling and production operations, the provision of oilfield services, and supply
chain integration services to the upstream oil and gas industry. NOV® also provides supply chain services through its
network of more than 200 distribution service centers located near major drilling and production activity worldwide.
We continue to build upon our unlimited, customer-focused solutions and are proud to deliver our Artificial Lift Systems
through the NOV Monoflo division.
NOV Monoflo
Artificial Lift Systems
Coverage
The NOV Monoflo division is a true partner and worldwide source for complete Artificial Lift equipment and packaged
solutions. Our Artificial Lift professionals collaborate with you to properly evaluate well conditions and provide customized
artificial lift solutions that will optimize your production.
• Professional Well Evaluation
• Surface and Subsurface Equipment
• Controllers and Production Automation
• All Production Accessories and Expendables
• Global Supply Chain and Service Solutions
LLOYDMINSTER, CANADA HOUSTON, TEXAS

Progressing Cavity Pump Systems
NOV Monoflo is a leader in the design, manufacture and
supply of progressing cavity pumps (PC Pumps) and artificial
lift solutions worldwide. With over 75 years of experience, 8
international sites and global distribution network, we provide
a range of PC Pump solutions that fulfill many oilfield production
needs. Our line of downhole PC Pumps are designed for use
in both oil production and dewatering applications where the
economics of production demand efficiency, reliability and low
life-cycle cost from the production equipment.
Common Applications
• Heavy Crude (aggressive geometry)
• Medium Crude
• Coal Bed Methane – CBM (specialized elastomers)
• Shale Oil and Water
• High GOR Wells
Features and Benefits
• Lower Capital Cost
The lack of expensive foundations, simple construction
and the compact surface drive units reduce start-up costs
which allow for more pumps to be installed and more oil
recovered.
• Lower Running Cost
Typically, a PC pump has an overall efficiency rating of 70%
which is significantly higher than alternative lift methods
and lowers the cost per barrel of recovered fluid.
• Reliable
The simple construction consists of only one moving part
downhole and has no standing or traveling valves to block.
The pump handles gas and solids without blocking and is
more resistant to abrasive wear.
• Environmentally Acceptable Profile
The low, unobtrusive profile of the quiet running surface
drivehead makes the PC pump ideal for environmentally
sensitive areas. Also, state of the art Leak Detection
Stuffing Boxes help protect the environment from spills.
www.nov.com/ArtificialLift
MonofloALS@nov.com

PROGRESSING CAVITY PUMP SYSTEMS
Progressing Cavity Pump Specifications
PUMP STATOR ROTOR INSERTABLE SLIMHOLED STATOR
PC Pump Series Displacement Lift Capacities Top Connection EUE Max O.D. Length Top Connector Pin Max O.D. Length Tubing Sizes Max O.D. Length
Metric Imperial Bbl/Day/100 RPM psi ft in in in in in in 2⅞” 3½” 4½” 5½” in in
2-1000 13-3300 13 1400 3300
49
64
2-2000 13-6550 13 2800 6550 1.9" Box 2.25 98 ¾ API Pin 1.04 113 • • • •
2-3000 13-9850 13 4200 9850 147 162
4-600 25-2000 25 852 2000
48
63
4-1200 25-4100 25 1704 4100 2⅞" Pin 3.1 98 ¾ API Pin 1.368 110 • • •
4-1800 25-6000 25 2556 6000 147 158
5-3000 28-9800 28 4200 9800 1.9" Box 2.25 98 ¾ API Pin 1.04 113 • • • •
7-1050 44-3450 44 1491 3450
147
162
7-1400
7-1750
44-4600
44-5750
44
44
1988
2485
4600
5750
1.9" Box 2.25
196
245
¾ API Pin 1.08
211
260
• • • •
7-2100 44-6900 44 2982 6900 294 309
9-1000 56-3300 56 1400 3300
98
113
9-1500
9-2000
56-4900
56-6550
56
56
2130
2800
4900
6550
2⅜" Box 2.76
147
196
⅞ API Pin 1.39
162
211
• • •
9-2500 56-8200 56 3550 8200 245 260
10-600
10-1200
10-1800
60-2000
60-4100
60-6000
60
60
60
852
1704
2556
2000
4100
6000
2⅞" Box
or 3½" Box
3.5
66
131
196
⅞ API Pin 1.677
80
146
211
• •
13-1500 82-5000 82 2130 5000 3½" Box 4.2 131 1 API Pin 2.450 146 •
15-1400
15-1800
95-4600
95-600
95
95
1988
2556
4600
6000
2⅞ Box or 3½" Box 3.5
172
222
⅞ API Pin 1.925
187
237
• •
16-840 100-2750 100 1192 2750
147
162
16-1120
16-1400
100-3650
100-4600
100
100
1590
1988
3650
4600
2⅜" Box 2.76
196
245
⅞ API Pin 1.39
211
260
• • •
16-1680 100-5650 100 2385 5500 294 309
21-660 131-2150 131 937 2150
147
162
21-880
21-1100
131-2900
131-3600
131
131
1249
1562
2900
3600
2⅜" Box 2.76
196
245
⅞ API Pin 1.39
211
260
• • •
21-1320 131-4350 131 1874 4350 294 309
24-900
24-1500
24-1800
24-3000
150-4100
150-5000
150-6000
150-10000
150
150
150
150
1278
2130
2556
4260
3100
5000
6000
10000
2⅞" Box
or
3½" Box
3.5
158
262
316
527
⅞ API Pin 1.790
173
277
331
542
• •
32-1500
32-1800
32-2700
200-5000
200-6000
200-8850
200
200
200
2130
2556
3834
5000
3½" Box x 2’ Weld Ext. or
6000
8850
4½" LTC Pin x 2’ Weld Ext.
4.5
292
346
507
1 API Pin 2.272
284
337
498
• 3.820
337*
390*
527*
40-750
40-1125
40-1500
250-2500
250-3750
250-5000
250
250
250
1065
1597
2130
2500
3750
5000
2⅞ Box
or 3½ Box
3.5
172
258
344
1 API Pin 1.810
187
273
359
• •
44-900
44-1400
44-1800
280-3100
280-4600
280-6000
280
280
280
1278
1988
2556
3100
3½" Box x 2’ Weld Ext. or
4600
6000
4½" LTC Pin x 2’ Weld Ext.
4.5
175
274
326
1 API Pin 2.200
166
265
317
• 3.820
219*
303*
370*
54-900 340-3100 340 1278 3100
266
257
310*
54-1200
54-1500
340-4100
340-5000
340
340
1704
2130
4100
5000
3½ Box x 2’ Weld Ext. or
4½ LTC Pin x 2’ Weld Ext.
4.5
346
427
1 API Pin 2.272
337
418
• 3.820
390*
471*
54-1800 340-6000 340 2556 6000 507 498 551*
64-520 400-1750 400 738 1750
185
176
229*
64-800
64-1040
400-2650
400-3450
400
400
1136
1476
2650 3½" Box x 2’ Weld Ext. or
3450 4½" LTC Pin x 2’ Weld Ext.
4.5
266
346
1 API Pin 2.259
257
337
• 3.820
316*
390*
64-1300 400-4350 400 1846 4350 427 418 471*
70-900
70-1350
70-1800
500-2700
500-4100
500-5300
440
440
440
1278
1917
2556
2700
3½" Box x 2’ Weld Ext. or
4100
6000
4½" LTC Pin x 4’ Weld Ext.
4.5
201
290
378
1⅛ API Pin 2.638
192
281
369
•
80-800 500-2700 500 1136 2700
201
192
80-1200
80-1600
500-4100
500-5300
500
500
1704
2272
4100 3½" Box x 2’ Weld Ext. or
5300 4½" LTC Pin x 2’ Weld Ext.
4.5
290
378
1⅛ API Pin 2.580
281
369
•
80-1800 500-6000 500 2556 6000 423 414
96-520 600-1750 605 738 1750
201
192
245*
96-800
96-1040
96-1300
600-2650
600-3500
600-4350
605
605
605
1136
1476
1846
2650
3½" Box x 2’ Weld Ext. or
3450
4350
4½" LTC Pin x 2’ Weld Ext.
4.5
290
378
467
1 API Pin 2.286
281
369
458
• 3.820
341*
378*
511*
96-1560 600-5350 605 2215 5100 555 546 599*
98-1200
98-1580
98-1800
615-4100
615-5200
615-6000
615
615
615
1704
2243
2556
4100
5200
6000
5½" LTC Pin
or 4½" Box
5.5
263
350
399
2⅜ PAC Pin 2.965
285
372
421
110-1600
110-1800
690-5300
690-6000
690
690
2272
2556
5300
6000
5½" LTC Pin
or 4½" Box
5.5
350
399
2⅜ PAC Pin 2.970
372
421
120-400
120-800
120-1000
120-1200
755-1350
755-2650
755-3400
755-4100
755
755
755
755
568
1136
1420
1704
1350
2650
3400
4100
3½" Box x 2’ Weld Ext.
also has optional
4 1/2" LTC Pin x 2' Weld Ext.
4.5
201
378
467
555
1 API Pin 2.275
192
369
458
546
• 3.820
245*
422*
511*
599*
130-1300
130-1625
820-4400
820-5380
820
820
1846
2307
4400
5380
5½" LTC Pin
or 4½" Box
5.5
350
438
2⅜ PAC Pin 2.913
372
460
150-600 940-2000 940 852 2000
378
369
422*
150-750
150-900
940-2500
940-3100
940
940
1065
1278
2500 3½" Box x 2’ Weld Ext. or
3100 4½" LTC Pin x 2’ Weld Ext.
4.5
467
555
1 API Pin 2.264
458
546
• 3.820
511*
599*
150-1200 940-4000 940 1704 4000 732 723 776*
165-1200
165-1800
1030-4100
1030-6000
1030
1030
1704
2556
4100
6000
6⅝" BTC Pin 6.6
301
402
2⅞ PAC Pin 3.990
322
428
200-1200
200-1800
1260-4100
1260-6000
1260
1260
1704
2556
4100
6000
7" LTC Pin 7.0
301
402
2⅞ PAC Pin 4.330
322
428
1
*Slimholed stators are only 4" longer than standard stators due to a welded on collar at the bottom. 1 All 3.82" OD slimholed stators will have 2 7/8" Box connections.

Rotors, Stators and Elastomers
Performance by Design
Rotors are available in alloy steel (4140) with hard chrome plating which provides resistance
to abrasion and wear. All pumps have 1:2 ratio lobe geometry and rotor chrome thickness
within 0.010 and 0.020 inches.
Through the use of advanced manufacturing technology and modern production techniques,
finite machining and plating of the rotor profile is maintained, ensuring that the design
performance is always achieved.
Elastomers
A range of stator elastomers is available allowing the pump to be selected for many
downhole fluid conditions as described below.
Rotors and Stators
Elastomer Type General Description and Application Temperature Limit Tensile Strength Tear Strength Abrasion Resistance H 2 S Resistance CO 2 Resistance Hardness (IRHD)
QS
(Soft Nitrile)
OD
(Soft Nitrile - Buna L)
RR
(Nitrile)
OBX
(High Nitrile)
OC
(Hydrogenated Nitrile)
• Very soft medium acrylonitrile content with good
oil and solvent resistance and excellent abrasion
resistance
• Typically used in very abrasive and high water cut
applications with low aromatic content fluids
• Soft medium acrylonitrile content with good oil
and solvent resistance and excellent abrasion
resistance
• Typically used in medium abrasive and high water
cut applications with low aromatic content fluids
• Medium acrylonitrile content with good oil and
solvent resistance
• Excellent abrasion resistance and mechanical
properties
• Typically used in abrasive and high water cut
applications with low to medium aromatic content
• High acrylonitrile content with improved oil and
solvent resistance and excellent mechanical
properties
• Higher acrylonitrile content provides extra
resistance to oils with medium to high aromatic
content
• High acrylonitrile content with similar properties
to OB but with improved resistance to hydrogen
sulfide (H S) and high temperature capability
2
80°C Good Good Excellent Good Poor 48-53
90°C Good Excellent Excellent Good Fair 60-65
100°C Good Excellent Excellent Good Good 68-72
100°C Excellent Excellent Excellent Good Fair 70-75
150°C Excellent Good Excellent Excellent Fair 69-75
www.nov.com/ArtificialLift
MonofloALS@nov.com

PROGRESSING CAVITY PUMP SYSTEMS
Two Run Insertable PC Pump
NOV Monoflo has an innovative, new insertable progressing cavity pump design that allows the
customer to insert a pc pump inside the production tubing and pressure test the tubing string with
one easy to use tool.
Features and Benefits
• There is no need for a service rig to
pull the production tubing to change a
downhole pump
• Pump changes can be done with a flushby
equipped for rod handling
• The unit minimizes the need to remove
production tubing, reducing the cost of
downhole gauge installations
• Allows for pressure testing the
production tubing as well as the primary
seal, while inserting the stator.
• The system has the ability to use any
progressing cavity pump without
performing any modifications.
• The system can pull the rotor out of the
well bore without unseating the primary
seal.
Mechanically Bonded Stator
Well temperatures can increase due to natural conditions and the use of
thermal stimulation techniques. These conditions challenge the viability of
the traditional chemically bonded pc pump stator.
One way to address this challenge is through new methods of anchoring the
elastomers into the stator tube. NOV Monoflo has developed elastomeric
stator technology to meet demands of high temperature wells.
The mechanically bonded stator is comprised of 3 main components (not
including the elastomer):
• Stator Tube
• Mechanical Bond Inserts
• End Caps
Available in two elastomer grades:
• OBX suitable for temperatures up to 110° C
• OC suitable for temperatures up to 150° C
Available sizes:
D32-900 (1 raw) D96-1040 (2 raw) D54-1800 (3 raw)
D44-900 (1 raw) D150-300 (1 raw) D64-1560 (3 raw)
D54-1200 (2 raw) D32-1800 (2 raw) D96-1560 (3 raw)
D64-1040 (2 raw) D44-1800 (2 raw) D150-600 (2 raw)
Rotor
Operating
Position
Insert Tool
Seating Nipple
Insert
Position
Stator
Tag-Bar
Torque Anchor
Seating Mandrel
with Primary Seal

NO-GO Tag Progressing Cavity Pumps
The NO-GO Tag system is a new advanced generation tool for rotor placement in progressing cavity
pumps. It provides all the functionality of a traditional bottom tag bar system with the following
advantages.
Features and Benefits
• Tags within the stator, leaving intake free of obstruction, allowing rotor to agitate solids
• Coilable through the pump by only pulling up polish rod
• Protects top end of stator elastomer by guiding coil entry through the pump
• Positive tag for proper rotor placement by guiding rotor through timed helical tag passage into
stator elastomer
• Unique integrated design eliminates flow losses and extra connections
• Tags using a conventional rod box
• Ability to land pump lower in well
• Eliminates costly mechanical tools below the pump while maintaining circulation clean-out
capabilities
Application
• Medium to heavy oil
• Wells producing solids (sand, coal fines, pyrite, etc.)
• Wells with history of intake plugging
• Wells with minimal cellar
Charge Pumps
Problem wells that produce slug sand, water, and/or gas can benefit from the use of a Charge Pump. These
pumps have 3 main parts:
• Production Pump - determines your lift capacity and final volume.
• Pup Joint - usually located between the two pumps and has additional holes or slots depending on the
application.
• Charge Pump - higher volume, lower pressure pump that maintains consistent wellbore fluid by mixing it
before entering the production pump.
Charge Pumps
Production Pump 10 15 24 32 40 44 54 64 70 80 96 120 150
Charge Pump 10 40 or 24 40 96 40 96 150
Specialty Components
• Perforated Stator - High Gas Rate Applications
• Hollow Rotor - Breaking up solids at intake
NO-GO Tag Insert
Bottom or Top View
www.nov.com/ArtificialLift
MonofloALS@nov.com

PROGRESSING CAVITY PUMP SYSTEMS
Hydraulic Driveheads
HTD
NOV Monoflo’s HTD hydraulic drivehead utilizes a bent axis motor that is
coupled to a hollow shaft bearing box by a belt and pulley system, which
transfers torque to the polished rod. Backspin is controlled through the
hydraulic system. The motors are available in a variety of displacements to
accommodate a wide variety of speeds and torques.
Features and Benefits of the HTD Hydraulic Drivehead
• Motor is available in various displacements
• Standard synchronous belt and sheave system
• Fully enclosed hinged belt guard
CG-33
Each model of the NOV Monoflo CG-33 hydraulic drivehead is a beltless top drive using
gears to transfer torque to the polished rod. The precision ground gears reduce
noise levels by up to five times in comparison to conventional belt drives,
making the CG-33 drivehead an ideal solution for use in populated areas. Each
CG-33 drive utilizes a radial piston motor designed to reduce internal friction
and run efficiently. These driveheads are fitted with a hydraulically activated
stuffing box that can withstand any progressing cavity pumping application.
Features and Benefits of the CG-33 Hydraulic Drivehead
• Enclosed gear housing eliminates need for belts, thus reducing field
maintenance
• Case hardened and precision ground gears drastically reduce noise levels.
• Gear drive utilizes a radial piston motor connected to the input gear, and
is available in various displacements
• Pressurized stuffing box prevents fluid from entering the seal chamber
extending the life of the seals
• Built in polished rod vise allows stuffing box seal change without removal of
drivehead or flush-by rig
Technical Specifications
Model HTD CG-33
Max. System Pressure 3600 psi (245 kPa) 3500 psi (24,132 kPa)
Max. System Temperature¹ 175 °F/ 80 °C 176 °F/80 °C
Polish Rod Size 1¼" (32 mm) 1¼" (32 mm)
Wellhead Connection 2d” EUE Pin or 38-3000
psi-R31 Flange
Thrust Bearing² Ca90-25,000 lbs /
ISO-96,300 lbs
Backspin Control Check valve on pressure side of
the motor.
Torque Control Adjustable pressure
compensator on pump.
38”-3000 psi-R31 Flange
Ca90-33,500 lbs /
ISO-129,000 lbs
Check valve on pressure side of
the motor.
Adjustable pressure
compensator on pump.
Model HTD CG-33
Variable Speed Control Adjustment knob on the pump. Adjustment knob on the pump.
Height Integral 31" (787 mm) 31" (787 mm)
Height Retrofit 47" (1194 mm) N/A
Width 29" (737 mm) 24" (610 mm)
Weight Integral 400 lbs (181 kg) 240 lbs (109 kg)
Weight Retrofit 450 lbs (204 kg) N/A
HTD Hydraulic Drivehead
CG-33 Hydraulic Drivehead
Bearing Box Grease Chevron Delo Grease EP NLGi2 1 tube (Chevron Ulti-Plex
Synthetic Grease)
¹ Maximum operating temperature may be limited by hydraulic oil. ² Ca90 load rating is for 90 million revolutions at 500 rpm. Reducing load by 50% increases life 10 times. Reducing speed by 50% doubles hours of life.

Electric Driveheads
NOV Monoflo provides a complete line of Electric Driveheads for all your production
needs.
Features and Benefits
• Robust frame
• Detachable stuffing box
• Operator-friendly guards and motor adjustments
• Easy-to-adjust door for simple belt tightening
• Accessible fill/drain spouts for easy oil changes
• Bearing box is designed with a three-bearing system (Models C-50, C-60, C-80,
and C-33M)
• Hollow shaft bearing box (Model N-25)
• Hydrodynamic brake (Models C-50, C-60, C-80, and C-33M)
• Hydraulically actuated caliper disc braking system (Model N-25)
• Brake reservoir for heat dissipation (Models C-50, C-60, C-80, and C-33M
• Service and technical support
Technical Specifications
Model C-50 C-60 C-80 C-33M N-25
Drive Type Direct Direct Direct Direct Direct
Shaft Type Hollow Hollow Hollow Hollow Hollow
Drive Style Bearing Box Bearing Box Bearing Box Bearing Bearing Box
Input Style Vertical Vertical Vertical Vertical Vertical
Drive Ratio 1:1 1:1 1:1 1:1 1:1
Backspin Control
Ratings
Hydrodynamic Hydrodynamic Hydrodynamic Hydrodynamic Caliper Disc
Max. Output Torque 2000 ft-lbs (2712 Nm) 2500 ft-lbs (3390 Nm) 3500 ft-lbs (4745 Nm) 1575 ft-lbs (2135 Nm) 600 ft-lbs (813 Nm)
Thrust Bearing 195,000 ISO lbf 227,000 ISO lbf 310,000 ISO lbf 45,100 ISO lbf 96,300 ISO lbf
Thrust Bearing¹ 50,500 Ca90 lbf 59,000 Ca90 lbf 80,400 Ca90 lbf 33,000 Ca90 lbf 25,000 Ca90 lbf
Maximum Speed 600 rpm 600 rpm 600 rpm 600 rpm 500 rpm
Horsepower Rating² 20 - 100 80 - 150 120 - 300 10 - 60 10 - 20
Frame Type Single Motor Dual Motor Dual Motor Single Motor Single
Polish Rod Size
1¼” or 1½”
(32mm or 38 mm)
1½” (38 mm)
1¼” or 2”
(38 mm or 51mm)
1¼” (32 mm) 1¼” (32 mm)
Max. Operating Temp. 212°F / 100°C 212°F / 100°C 212°F / 100°C 428°F / 220°C 180°F / 80°C
Dimensions
Height with Retro. Stuffing Box 50” (1270mm) 55” (1397mm) 64” (1626mm) 44” (1118mm) 34” (864mm)
Width 35” (889mm) 41” (1041mm) 42” (1067mm) 35” (889mm) 30” (762mm)
Input Shaft Size 3¼” (83 mm) 3¼” (83 mm) 4¼” (108mm) 3¼” (83 mm) 2½” (64 mm)
Weight 1350 lbs (612kg) 1700 lbs (771kg) 2100 lbs (953kg) 1350 lbs (612kg) 600 lbs (272kg)
¹ Ca90 load rating is for 90 million revolutions. Reducing load one half increases life 10 times. Reducing rpm by one half doubles hours of life.
² Maximum HP rating based on frame size only. Care must be taken in selecting motor and sheave combinations to ensure input rod torque is not exceeded.
N-25 Electric Drivehead
C-33M Electric Drivehead
C-50 Electric Drivehead
C-60 Electric Drivehead
C-80 Electric Drivehead
www.nov.com/ArtificialLift
MonofloALS@nov.com

PROGRESSING CAVITY PUMP SYSTEMS
Leak Free Stuffing Box
The NOV Monoflo Leak Free (LF) stuffing box is a pre-built assembly that has been exclusively
designed to simplify monitoring seal wear. It consists of a double mechanical seal supplied
in a single sealed cartridge.
Features and Benefits
• Designed with a two bearing system consisting of seal bearings designed to be
in one cartridge for easy replacement which results in less downtime during
maintenance
• Can be mounted directly on drivehead with or without a booth
• Utilizes a double mechanical seal supplied as a sealed cartridge, to deliver extended periods of leak free
operation and contains any leaked fluid inside the unit
• Double sealing mechanism performs an improved sealing function.
• Easy fitting of the cartridge arrangement with no setting requirement normally associated with conventional
mechanical seals; seal abuts bearing to set working length
• Positive drive from the spindle via key through sleeve of the mechanical seal
• All sealing faces are made from solid material for increased pressure and thermal stability
• Equipped with a leakage detection unit which provides a visible indication to any breach of the primary seal
and also ensures barrier fluid lubrication of the seal faces for maximum durability
• The leakage detection unit can be reset after seal replacement
Hydrodynamic Brake
The Hydrodynamic Brake consists of a stationary half (stator) and
a rotary half (rotor). The stator is bolted into the housing and the
rotor is coupled to the shaft. During normal operation the rotor spins
freely. When the unit goes into backspin, the rotor begins to rotate
in the counter clockwise direction. The working fluid is then forced
to the outside of the rotor and creates a circular flow path inside the
brake cavity. As the energized fluid from the rotor comes into contact
with the stationary fins of the stator, the energy is transferred to the
stator and then back to the working fluid as heat. A small amount of
working fluid is continually removed from the system and replaced
with new fluid. The working fluid contained in the drivehead reservoir
is used as the braking medium, which allows the energy stored in the
fluid column and rod string to safely dissipate without the drivehead
reaching excessive backspin speeds.
Features and Benefits
• Non-friction brake eliminates wear on brake components
• Brake capable of 2000 ft-lbs resisting torque at 250 hp
• Reliable and repeatable braking
• Backspin energy is absorbed by the working fluid
• Heat generated by braking is dissipated by the fluid reservoir
• Consistent braking with minimal maintenance throughout the
drivehead’s life
Brake Stator
Brake Rotor
Hydrodynamic Brake Curves

VFD Controller
The NOV Monoflo Progressing Cavity Pump Controller provides a
number of features specifically designed for operation of progressing
cavity pumps. The drive combines motor and pump control into a
single, compact package that increases production, improves energy
efficiency and enhances the reliability of both new and existing
pumping systems.
Multiple Constraint Optimization
At any instant during the life of a well, there is a single constraint
that limits production. Production can be maximized without
compromising efficiency or reliability by forcing the system to
operate at the constraint limiting production at each instant of time.
Determining the applicable limits and moving smoothly between
them in real time is a key advantage of the system. Models of all
the system elements are run in real time at the wellhead to detect
appropriate limits and enforce associated control strategies. At
different points in time, the system may be limited by motor voltage,
motor current, motor speed, motor torque, motor thermal capacity,
power demand, rod string torque, flow line pressure, fluid level, or
well inflow. Multiple constraint optimization is particularly beneficial
in applications with variable inflow conditions, such as those found in
coal-bed methane, high gas/oil ratio, and thermally stimulated wells.
Sensorless Operation
The drive uses a number of unique methods for precisely determining
performance parameters from models of the pumping system
elements without requiring external surface or downhole sensors.
Sensorless system variables including rod speed, rod torque, pump
speed, pump torque, fluid flow, fluid level, suction pressure, discharge pressure, and differential pressure can be
observed through the drive keypad/display or recorded as circle charts and time-based plots. Fluid level, pump flow,
and total production are displayed in selectable engineering units.
Sophisticated Modeling
Embedded mathematical models of the drive, motor, drive head, rod string, pump, flow line, tubing, casing, fluid, and
reservoir use component specifications and well completion information along with field setup parameters to monitor
pumping system operation. Identification routines automatically determine installation-dependent system parameters
including those of the motor, rod string, and pump. The models capture the thermal, mechanical, electrical, and
hydraulic behavior of the system to control the pumping process with greater precision than ever before.
Pump Speed Control
The drive provides a number of options for manual, remote, and automatic control of pump speed. Speed commands
can be selected from a number of sources including potentiometer adjustments, keypad presets, serial data
communications, and internal optimization controllers. The motor can be operated up to twice base speed at constant
power. This allows the overall gear ratio to be increased, thereby providing increased low-speed torque without loss
of maximum pump speed. Dual motors can be controlled from a single drive for operation of large pumps. The system
can be configured for optimization of fluid production, gas production, energy efficiency, and/or power flow.
www.nov.com/ArtificialLift
MonofloALS@nov.com

Corporate
Headquarters
7909 Parkwood Circle Drive
Houston, Texas 77036
United States
Phone: 713 375 3700
Fax: 713 346 7687
Sales
8708 West Little York Road
Suite 100
Houston, Texas 77040
United States
Phone: 281 854 0300
Fax: 281 854 0301
National Oilwell Varco has produced this brochure for general information only, and it is not
intended for design purposes. Although every effort has been made to maintain the accuracy and
reliability of its contents, National Oilwell Varco in no way assumes responsibility for liability for any
loss, damage or injury resulting from the use of information and data herein. All applications for the
material described are at the user’s risk and are the user’s responsibility.
All brands listed are trademarks of National Oilwell Varco.
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© 2012 National Oilwell Varco
D392004432-MKT-001 Rev. 02