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AGITATOR HANDBOOK
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AGITATOR TOOL HANDBOOK
This handbook is intended to be an aid to the operator and is solely provided for information and illustration purposes.
Please feel free to contact any of our locations with questions not answered in this handbook.
The technical data and text in this handbook is subject to change without notice.
NOV Downhole is the largest independent downhole tool and equipment provider in the world. We have the expertise to optimize BHA selection and performance, supporting over 150 locations in more than 80 countries.
Our complete range of solutions for the bottom hole assembly and related equipment includes:
Drill Bits Drilling Motors Borehole Enlargement Drilling Tools and Products Coring Services Fishing Tools Intervention and Completion Tools Service Equipment Advanced Drilling Solutions We take pride in delivering superior performance and reliability. Our objective is to exceed our customers expectations, improve their economics and be an integral part of their strategies.
AGITATOR
1. Introduction ...................................................................2 1.1 Drilling ............................................................2
1.2 Intervention and Coiled Tubing .........................3
2. How It Works ................................................................4
Planning the Job ...............................................................8 3.1 Operating Parameters ......................................8
3.2 Drilling/Completion Fluids ................................8
3.3 MWD ...............................................................8
4. Applications ..................................................................9 4.1 Drilling Applications .........................................9
4.2 Non-Drilling Applications .................................9
4.3 Optimization Service .......................................9
5. Drilling Procedures (Jointed Pipe) ..............................10 5.1 Surface Testing .............................................10
5.2 Testing with MWD Systems ...........................12
5.3 Advice While Drilling ......................................13
5.4 Tool Storage and Handling .............................14
6. Trouble Shooting ........................................................15 6.1 Tool Operation ...............................................15
7. Specifications ............................................................18 7.1 Agitator Specifications ...................................18
7.2 Power Sections
Specifications and Guidelines.........................35
7.3 Dog Leg Severity (DLS) .................................39
7.4 Shock Tool Selection .....................................39
8. Reliability ...................................................................40
Contents
The information contained within this handbook is believed to be accurate and is based upon run histories and empirical data. However, NOV makes no warranties or representations to that effect. All information is furnished in good faith, and the use of this information is entirely at the risk of the user.
1
1.1 Drilling
The Agitator gently oscillates the BHA or drillstring to substantially reduce friction. This means improved weight transfer and reduced stick-slip in all modes of drilling, but especially when oriented drilling with a steerable motor. As well profiles become more tortuous and the limits of extended reach boundaries are explored, the Agitator provides a simple means of expanding the operating window of conventional steerable motor assemblies.
Smooth weight transfer and exceptional tool face control is now possible with PDC bits, even in significantly depleted formations after large azimuth changes. Extended intervals can be achieved and the lack of requirement to work the BHA - to obtain and maintain tool face - provides significant ROP improvements.
The Agitator is compatible with all MWD systems and provides a viable means of extending long reach targets while improving ROP, reducing roller cone bit runs and minimizing the chance of differential sticking.
MWD/LWD Compatibility Does not damage MWD tools or corrupt signals Reduces lateral and torsional vibration Run above or below MWD No impact force to bit or tubulars
Bit Friendly Can be used with roller cone bit or fixed cutter bits No impact forces to damage teeth or bearings Extends PDC life through controlled weight transfer; no spudding
Directional Enhancement Prevents weight stacking and allows excellent tool face control Provides means of sliding at increased ROP and lower weight off hook Allows weight transfer with less drill pipe compression
1. Introduction
2
AGITATOR
The Agitator allows steerable motors to expand the boundaries of extended reach drilling, and enhances their efficiency in less complex applications.
1.2 Intervention and Coiled Tubing
Friction also plagues intervention work. The Agitator has been used to convey memory logs, perforating guns and to slide stuck tubing sleeves at the end of tortuous completion strings. It has also proven beneficial in running liners and in the retrieval of stuck assemblies.
Note: Please contact NOV for up to date information.
3
Fig. 1
2. How it Works
Power Section
Shock Tool
The Agitator system relies on three main mechanisms:1. Power section2. Valve and bearing section3. Excitation section:
Running on jointed pipe = use a shock tool Running on coiled tubing = coiled tubing does the shock tools job
Valve & Bearing Section
Fig. 24
AGITATOR
P (psi)
t (sec)
1. Valve moves to one extremity TFA minimized = pressure peak
P = pressure drop across valve plates
t = time
t (sec)
P (psi)
2. Valve moves to center TFA maximized = pressure trough
P (psi)
t (sec)
3. Valve moves to other extremityTFA minimized = pressure peak
Fig. 3. Relative positions of valve plates
The power section drives the valve section producing pressure pulses which in turn activate the shock tool or act on the coiled tubing. It is the axial motion of the shock tool or coiled tubing which breaks static friction.
The unique valve system is the heart of the tool; it converts the energy available from the pumped fluid into a series of pressure fluctuations (pressure pulses). This is done by creating cyclical restrictions through the use of a pair of valve plates. The valve opens and closes with the result that the total flow area (TFA) of the tool cycles from maximum to minimum.
At minimum TFA, the pressure is high and at maximum TFA, the pressure is low. (See Fig. 3)
5
The frequency of these pressure pulses is directionally proportional to the flow rate. Refer to the tool specifications to see the frequency/flow rate relationship for each tool size. The size of the valve plates is configured based on operational parameters to optimize performance and ensure that the pressure drop is always within specification.
The Agitator itself only creates pressure pulses. In order to transform this hydraulic energy into a useful mechanical force in jointed pipe operations, a shock tool is placed above the Agitator tool in the BHA or drill string as in Fig 2. In coiled tubing operations only the Agitator is required; the coiled tubing expands and contracts as the pressure pulses act on it.
The shock tool contains a sealed mandrel which is spring loaded axially, (see Fig. 4). When internal pressure is applied to the shock tool the mandrel will extend due to pressure acting on the sealing area (also known as the pump open area) within the tool. If the pressure is removed, the springs return the mandrel to its original position. When used directly above the Agitator, the pressure pulses cause the shock tool to extend and retract, thus producing an axial oscillation. The Agitator system may be positioned anywhere in the drillstring to focus energy where it will be most effective.
Agitator System - Overview
The Agitator System consists of a power section which drives a valve
The valve creates pressure pulses. Their frequency is directly proportional to the flow rate
Shock Tool: A shock tool converts pressure pulses into axial movement (in coiled tubing applications a shock tool is not required)
How It Works
6
AGITATOR
Fig. 4 Shock Tool
7
Springs
Seal Area
3. Planning The Job
3.1 Operating Parameters
Customers are requested to complete a simple Agitator pre-job check sheet to ensure that the tool is set-up correctly, including: Flow rate Fluid weight and type (See section 3.2) Pressure drop available to the Agitator Downhole temperature Inclination and azimuth Drilling/intervention plan and/or well type Planned BHA configuration
The valve plates will be selected based upon flow rate, fluid weight and pressure drop available to the Agitator. The flow rate and mud weight ranges should be kept as accurate as possible to aid best tool set-up. Hydraulics software is used to aid tool set-up and produce an operating chart for the job.
3.2 Drilling/Completion Fluids
Drilling/completion fluids information is required to ensure that the power section elastomer and the rotor will be compatible with the operating environment: Brand and manufacturer Type/composition Chlorides concentration PH level Mud oil/water ratio (%) MSDS sheets for all completion fluids and additives
Downhole operating temperatures will also influence choice of power section.
3.3 MWD
The Agitator is compatible with all MWD systems. Pre-job planning is advised to avoid any problems at the rig site, however. Where the MWD frequency can be altered please contact NOV for advice. Also see Section 7.1 for Agitator frequency information.
8
AGITATOR
4.1 Drilling Applications
Applications and tool positioning:
Above motor, below MWD Above motor and MWD Vertical rotary assembly Andergauge adjustable stabilizer assembly Up hole on drill pipe (See 4.3 Optimization Service) Dual Agitator assembly (See 4.3 Optimization Service) TTRD Coiled Tubing drilling
4.2 Non-Drilling Applications
Coiled Tubing Intervention: - Extended reach
- Stimulation - Manipulation - Scale/fill removal - Logging
Fishing Running liners Cementing
4.3 Optimization ServiceIf provided with full well information, NOV can provide an optimization service to ensure that the placement of the Agitator is optimized for jointed pipe operations.
Torque and drag analysis Determine effective friction factors
4. Applications
9
5. Drilling Procedures (Jointed Pipe)
5.1 Surface Testing
Make up the tool in the BHA; do not grip on stator body whilst making up.
For BHA placement in jointed pipe applications the Agitator will normally be positioned between the mud motor and the MWD system. (see 4. Applications and 5.3 Tool Positioning).
The shock tool is placed directly above the Agitator main body. (See Fig 5)
The Agitator and shock tool may be tested on surface to test the movement of the shock tool.
The Agitator frequency is directly proportional to flow rate. During the surface test, strong rig vibrations may be apparent. If this is the case, it may be necessary to test with a lower flow rate. At lower flow rates the movement on the shock tool will be reduced.
Movement should be seen at the top of the shock tool during the surface test. Movement is generally in the range 8 - a (3 10 mm). If there is very little weight below the shock tool, movement may not commence until a reasonable flow rate has been achieved.
Cold Climates TestingThe tool should not be surface tested if the temperature is below 14F (-10C). There is a high risk of damaging the elastomer.
Hot Hole Tools TestingThe power section will be fitted with a relaxed interference fit to ensure correct performance under hot conditions. On surface (lower temperatures) the elastomer will not swell and a higher then specified pressure drop will be experienced.
Note: Contact NOV for Operating Procedures relating to coiled tubing drilling and intervention operations.
10
AGITATOR
Fig. 5. Agitator
11
Pressure Drop
Shock Tool
Pulses act on
pump open seal area
Pulse generated
at operating frequency
Pulses converted to
axial displacement
Agitator
Power Section
Valve & Bearing Section
Drilling Procedures
5.2 Testing with MWD Systems
Check with the MWD Field Engineers whether they will be testing just to see pulses (Pulse Only Test), a more comprehensive test (Full MWD Test), or if they will test the MWD 656 984 ft (200 300 m) downhole (Shallow Hole MWD Testing).
Pulse Only Test (at Surface)
This can be done with the Agitator in the BHA. Test the flow rate required by the MWD (this should be more than sufficient to activate the Agitator system). There will be easily recognizable oscillations in the BHA. If the shock tool is visible, there will be an obvious 8 - a (310 mm) axial movement.
Full MWD Test (at Surface)
NOV recommends testing the Agitator separately from the MWD string. Once the test has been successfully completed, the Agitator can then be picked up and tested.
Bring the pumps up steadily until vibrations can be felt, or movement seen in the shock-tool. There is no need to pump at full drilling rate for the Agitator test. As soon as vibrations are seen, the test is successful and the pumps can be turned off.
Shallow Hole MWD Testing
Where an MWD test is to be done at a depth of typically 656 984 ft (200 300 m), NOV recommends the Agitator and motor are tested at surface, as above. The MWD string can then be picked up and run into the hole for a normal test.
There is no minimum duration for testing if vibration is seen, then the test is good.
Additional confirmation can be seen on the MWD Operators pulse detection screen.
12
AGITATOR
5.3 Advice While Drilling
Weight on BitThe Agitator can be more effective at overcoming weight stacking problems when lower WOB is used. With a higher WOB the springs in the shock tool are compressed, reducing the effectiveness of the Agitator. In low inclination wells ensure that the shock tool is in compression and avoid bit bounce.
Tool Positioning
In highly tortuous well designs, or where it can be proven that weight stacking is occurring further up the hole, it may be beneficial to run the Agitator system higher in the drill string. Please contact your local NOV office for further assistance.
Operational Effectiveness
The optimum effectiveness of the tool depends on mud flow rate. The tool will have been specifically configured for the job in hand and should be run at its optimum flow rate for maximum performance. The tool will be more aggressive at higher flow rates. The Pre-Job Check Sheet will contain drilling parameters specific to your job.
Note: Check with your local NOV office if there will be significant changes in drilling parameters.
13
5.4 Tool Storage and Handling
Cold Climate Storage Guidelines
Stators should be stored in an environment above 32F (0C). Short duration below freezing will be unavoidable when transporting to the field or on stand-by but long term storage should be above 32F (0C). Assembled tools should not be stored in temperatures below 14F (-10C) for periods exceeding one week.
Hot Climate Storage Guidelines
Stators should not be stored in direct sunlight. Cover tools with a tarp if stored outdoors.
Post-Job Handling
Flush tool with clean water first then apply a soapy solution, e.g. washing-up liquid. The Agitators power section cannot be rotated by external force; hang tool vertically (pin connection down); pour solution in the top (box connection) and allow to filter down through the power section. Alternatively, pump fresh water though the tool.
14
AGITATOR
6. Trouble Shooting
Section through a 1:2 PDM
Section through a 5:6 PDM
Fig. 6
15
6.1 Tool Operation
Recognizing How the Tool is WorkingIf the Agitator is under-performing then the following factors should be considered:
Mud weight and flow rate vs. planned: Check these parameters against the operating chart.
BHA position reposition the Agitator or add a second tool (See 4.3 Optimization Service)
Temperature and mud type: actual vs. planned Hours in hole LCM pumped Agitator has same capabilities as a
drilling motor.
Elastomer Over Shakers
More than likely to be the drilling motor. The Agitator power section is not required to generate torque therefore is less stressed and less likely to fail. The Agitator power section is a 1:2 lobe style section whereas most motors are multilobe. (See Fig. 6) Therefore close observation of the elastomer pieces should reveal whether it is the Agitator or a multilobe molding.
Frequency Fig. 7
0.31
0.25
0.19
0.12
0.06
Ampl
itude
Example MWD Trace
0.0 5.0 10.0 15.0 20.0 25.0
Trouble Shooting
16
Using the MWD Oscilloscope to Monitor Agitator Frequency
The Agitators frequency can be monitored on the MWD oscilloscope (See Fig 7). Normally a spike will be apparent at the Agitators operating frequency which verifies tool operation. Fig.7 shows spike at approx. 17 Hz.
The operating frequency can vary by up to 2Hz from tool to tool so do not be alarmed if the frequency is not exactly as calculated. Changes in temperature can also affect the tool frequency.
Signal Loss
The Agitator will still be operating even if a signal reduction or loss is experienced. This is not unusual, and only if accompanied by a large pressure change should there be cause for concern. Signal loss is likely to be caused by: Harmonics Attenuation
Often the signal will return through time/depth if caused by harmonics. If down due to attenuation then the signal will generally decrease with depth (See Fig 8).
Frequency Fig. 8
Ampl
itude
0.31
0.25
0.19
0.12
0.06
0.0 5.0 10.0 15.0 20.0 25.0
Example MWD Trace
AGITATOR
17
The MWD software and hardware set-up itself will affect the oscilloscope display. Check the following when comparing signals: Axis scale and units Harmonics Filters
Tool
Siz
e (O
D)28
2a
2d
2d
(H
F)38
(H
F)3a
3-
a
(HF)
Over
all L
engt
h6
ft6
ft5w
ft7
ft7
ft62
ft7
ft
Wei
ght
80 lb
s90
lbs
100
lbs
100
lbs
125
lbs
125
lbs
145
lbs
Reco
mm
ende
d Fl
ow R
ange
40
-80
gpm
40-8
0 gp
m40
-80
gpm
40-1
40 g
pm40
-140
gpm
90-1
40 g
pm40
-140
gpm
Tem
p Ra
nge*
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)
Oper
atin
g fr
eque
ncy
9 Hz
@ 4
0 gp
m9
Hz @
40
gpm
15 H
z @
40
gpm
9 Hz
@ 1
20 g
pm9
Hz @
120
gpm
26 H
z @ 1
20 g
pm9
Hz @
120
gpm
Oper
atio
nal P
ress
ure
drop
ge
nera
ted
600-
800
psi
600-
800
psi
600-
800
psi
500-
700
psi
500-
700
psi
450-
700
psi
500-
700
psi
Max
Pul
l20
,000
lbs
20,0
00 lb
s85
,000
lbs
85,0
00 lb
s12
0,00
0 lb
s15
0,00
0 lb
s16
0,00
0 lb
s
Conn
ectio
ns12
AM
MT
pin/
box
12
AMM
T pi
n/bo
x2a
PA
C-DS
I pi
n/bo
x2a
PA
C-DS
I pi
n/bo
x2a
RE
G pi
n/bo
x
2a
REG
pin/
box
or 2
d
REG
pin/
box
2a
REG
pin/
box
or 2
d
REG
pin/
box
* Hi
gher
tem
pera
ture
s av
aila
ble
on re
ques
t
7. Specifications
7.1 Agitator Specifications
18
Tool
Siz
e (O
D)3w
4w
(H
igh
Flow
)5
(Hig
h TO
RQUE
)62
6w
8
9s
Over
all L
engt
h12
2 ft
8w ft
8w ft
6 ft
9 ft
11 ft
12 ft
Wei
ght
240
lbs
310
lbs
498
lbs
900
lbs
1,00
0 lb
s1,
600
lbs
2,00
0 lb
s
Reco
mm
ende
d Fl
ow R
ange
90
-140
gpm
15
0-27
0 gp
m
250-
330
gpm
150-
270
gpm
25
0-33
0 gp
m37
5-47
5gpm
400-
600
gpm
500-
1,00
0 gp
m60
0-11
00 g
pm
Tem
p Ra
nge*
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)30
2F
(150
C)
302
F (1
50C
)
Oper
atin
g fr
eque
ncy
26 H
z @
120
gpm
18-1
9 Hz
@ 2
50 g
pm
16-1
7 Hz
@ 2
50 g
pm16
-17
Hz @
250
gpm
15 H
z @ 4
00 g
pm16
-17
Hz @
50
0 gp
m16
Hz @
900
gpm
12-1
3 Hz
@ 9
00 g
pm
Oper
atio
nal P
ress
ure
drop
ge
nera
ted
500-
700
psi
550-
650
psi
550-
650
psi
600-
700
psi
600-
700
psi
600-
800
psi
600-
800
psi
Max
Pul
l23
0,00
0 lb
s *d
epen
ding
on
ser
vice
con
nect
ion
260,
000
lbs
500,
000
lbs
570,
000
lbs
570,
000
lbs
930,
000
lbs
1,14
5,00
0 lb
s
Conn
ectio
ns2a
IF,
2d
IF
2d
AM
OH, 2
d
REG
pin/
box
32
IF p
in/b
ox4
GRA
NT P
RIDE
CO X
T39
pin/
box
42
XH, 4
IF
pi
n/bo
x or
NC4
6 pi
n/bo
x
42
IF
pin/
box
6s
REG
pin/
box
or N
C-56
pin
/box
7s
REG
box
up7s
RE
G pi
n do
wn
or 6
s
REG
pin
dow
n
AGITATOR
19
LC
A
B
D
KZ
J
I
X
X
H
G
E
F
Dim Description In mm Dim Description In mm
A 28 Agitator 72.90 1852 H Bottom Sub 1.00 25
B Top Sub Length 7.90 201 I Top Sub 1.25 32
C Stator Length 57.00 1448 J Top Sub 1.45 37
D Bottom Sub Length 8.00 203 K Stator I.D. 1.75 44
E Top Sub 2.12 54 L Rotor 44.30 1125
F Stator 2.12 54 X 12 AMMT Connection
G Bottom Sub 2.12 54 Z 1.820 10-3G Stub ACME Thread
20
Specifications
28 Agitator Assembly
LC
A
B
D
KZ
J
I
X
X
H
G
E
F
Dim Description In mm Dim Description In mm
A 2a Agitator 72.90 1852 H Bottom Sub 1.00 25B Top Sub Length 7.90 201 I Top Sub 1.25 32
C Stator Length 57.00 1448 J Top Sub 1.45 37
D Bottom Sub Length 8.00 203 K Stator I.D. 1.75 44
E Top Sub 2.38 60 L Rotor 46.56 1183
F Stator 2.38 60 X 12 AMMT Connection
G Bottom Sub 2.38 60 Z 1.820 10-3G Stub ACME Thread
AGITATOR
21
2a Agitator Assembly
Specifications
Dim Description In mm Dim Description In mm
A 2d Agitator 69.00 1753 I Top Sub 1.25 32
B Top Sub Length 8.00 203 J Top Sub 2.06 527
C Stator Length 53.00 1346 K Stator I.D. 2.44 624
D Bottom Sub Length 8.00 203 L Rotor 44.35 1126
E Top Sub 2.88 73 M Rotor OD 1.10 28
F Stator 2.88 73 X 2a PAC-DSI Connection
G Bottom Sub 2.88 73 Y Sub ID Restricted from 0.550 to 0.90H Bottom Sub 1.25 32 Z 2.550 8-3G Stub ACME Thread
22
2d Agitator Assembly
L
D
C
A
B
M
Y
Z
X
X
I
J
K
Z
H
G
F
E
Dim Description In mm Dim Description In mm
A 2d Agitator 85.60 2174 I Top Sub 1.25 32
B Top Sub Length 8.00 203 J Top Sub 2.06 52
C Stator Length 70.00 1778 K Stator I.D. 2.44 62
D Bottom Sub Length 7.60 193 L Rotor 61.20 1554
E Top Sub 2.88 73 M Rotor OD 1.12 28
F Stator 2.88 73 X 2a PAC-DSI Connection
G Bottom Sub 2.88 73 Y Sub ID Restricted from 0.60 and 0.90H Bottom Sub 1.25 32 Z 2.550 Stub ACME Thread
AGITATOR
23
2d Agitator Assembly (HF)
L
X
Z
Y
D
C
A
B
M
Z
H
G
F
I
X E
J
K
Z
Dim Description In mm Dim Description In mm
A 38 Agitator 85.85 2181 I Top Sub 1.25 32
B Top Sub Length 8.00 203 J Top Sub 2.06 52
C Stator Length 70.00 1778 K Stator I.D. 2.44 62
D Bottom Sub Length 7.850 199 L Rotor 61.20 1554
E Top Sub 3.13 80 M Rotor OD 1.12 28
F Stator 3.13 80 X 2a REG Connection
G Bottom Sub 3.13 80 Y Sub ID Restricted from 0.60 and 0.90
H Bottom Sub 1.25 32 Z 2.650 Stub ACME Thread - -
24
38 Agitator Assembly (HF)
Specifications
L
D
C
A
B
M
X
Z
Y
H
G
F
I
X E
J
KZ
Dim Description In mm Dim Description In mm
A 3a Agitator 77.05 1957 I Stator 2.75 70
B Top Sub 15.75 400 J Bottom Sub 1.586 40
C Stator 48.00 1219 K Bottom Sub 1.50 38
D Bottom Sub 13.30 338 L Rotor 39.00 990
E Top Sub 3.50 89 X 2d Reg Pin Connection
F Stator 3.38 86 Y 2d Reg Box - -
G Bottom Sub 3.50 89 Z 2.875 8-3G Stub ACME
H Top Sub 1.60 41
AGITATOR
3a Agitator Assembly
25
3a Agitator Assembly with 2d REG Connection
Y
H
X
I
K
G
J
C
A
B
D
L
M
Z
E
Dim Description In mm Dim Description In mm
A 3a Agitator 84.73 2152 I Top Sub 1.6 41
B Top Sub Length 8.00 203 J Top Sub 2.00 51
C Stator Length 70.00 1778 K Stator I.D. 2.44 62
D Bottom Sub Length 6.73 1714 L Rotor 61.20 1554
E Top Sub 3.50 89 M Rotor OD 1.12 28
F Stator 3.38 86 X 2a REG Connection
G Bottom Sub 3.50 89 Y Sub ID Restricted from 0.60 and 0.90
H Bottom Sub 1.50 38 Z 2.875 Stub ACME Thread - -
3a Agitator Assembly (HF)
26
Specifications
L
D
C
A
B
E
KZ
I
X
J
M
X
Z
Y
H
G
F
Dim Description In mm Dim Description In mm
A 3w Agitator 151 3835 K Top Sub ID 1.50 38
B Top Sub Length 51.30 1303 L Top Sub ID 2.13 54
C Stator Length 49.60 1260 M Stator ID 2.75 70
D Bottom Sub Length 51.00 1296 N Rotor Length 38.98 990
E Top Sub OD 4.00 102 O Rotor OD 1.12 29
F Top Sub OD 3.75 95 P Top Sub Fishing Neck 12.00 305
G Stator OD 3.75 95 X See above table
H Bottom Sub OD 3.75 95 Y Sub ID Restricted between 0.725 and 0.875
I Bottom Sub OD 4.00 102 Z Modified PAC Connection
J Bottom Sub ID 1.50 38
Connection Option
X
2a IF
2d IF
2d AMOH
2d REG
AGITATOR
3w Agitator Assembly
C
A
B
D
N
H
G
F
EX
K
O
YZ
ZM
L
JI
X
27
Dim Description In mm Dim Description In mm
A 4w Agitator 105 2667 I Top Sub ID 2.25 57
B Top Sub Length 18 457 J Top Sub 3.35 85
C Stator Length 68 1727 K Stator ID 3.84 97
D Bottom Sub 19 483 L Rotor Length 54.07 1373
E Top Sub OD 4.75 121 M Rotor OD 1.64 42
F Stator OD 4.75 121 X 32 IF Connection
G Bottom Sub OD 4.75 121 Y Sub ID Restricted from 1.00 to 1.35
H Bottom Sub ID 2.00 51 Z 4.3 - 4 TPI Tapered ACME Thread
28
4w Agitator Assembly Standard and High Flow
Specifications
L
D
C
A
F
BI
X
J
M
Z
Y
G
E
KZ
X
H
Dim Description In mm Dim Description In mm
A 5 Agitator 134.14 3407 J Bottom Sub ID 2.00 51
B Top Sub Length 31.50 800 K Top Sub ID 2.25 57
C Stator Length 68 1727 L Top Sub ID 2.75 70
D Bottom Sub 34.64 880 M Stator ID 3.84 98
E Top Sub OD 5.00 127 N Rotor Length 54.07 1373
F Flex Profile OD 4.00 102 O Rotor OD 1.64 42G Stator OD 5.00 127 X XT 39 Connections
H Flex Profile OD 4.00 102 Y Sub ID Restricted from 1.00 to 1.35I Bottom Sub OD 5.00 127 Z 4.3 - 4 TPI Tapered ACME Thread
AGITATOR
29
5 Agitator Assembly
M
ON
D
C
A
B
X
Z
Y
E
Z
X
K
L
F
G
H
I
J
Dim Description In mm Dim Description In mm
A 62 Agitator 180.88 4594 J Bottom Sub ID 2.50 64
B Top Sub Length 51.08 1297 K Top Sub ID 2.50 64
C Stator Length 83.00 2108 L Top Sub ID 2.50 64
D Bottom Sub 46.80 1189 M Stator ID 5.00 127
E Top Sub OD 6.50 165 N Rotor Length 64.00 1628
F Flex Profile OD 4.77 121 O Rotor OD 2.30 58.4
G Stator OD 6.50 165 X XT 39 Connections
H Flex Profile OD 4.77 121 Y Sub ID Restricted from 1.30 to 1.70
I Bottom Sub OD 6.50 165 Z Service Connection (mod pac - 1.5 TPF
30
62 Agitator Assembly
Specifications
M
ON
D
C
A
B
X
Z
Y
E
Z
X
K
L
F
G
H
IJ
LD
C
A
B
K
I
X
ZJ
M
H
F
E
G
X
Z
Y
Dim Description In mm Dim Description In mm
A 6w Agitator 113.0 2870 I Top Sub 2.81 71
B Top Sub Length 18.0 457 J Top Sub 4.63 118
C Stator Length 72.00 1829 K Stator ID 5.57 141
D Bottom Sub 22.50 572 L Rotor 57 1448
E Top Sub OD 6.75 171 M Rotor OD 2.57 65
F Stator OD 6.75 171 X 42 IF Connection
G Bottom Sub 6.75 171 Y Sub ID Restricted from 1.00 to 1.35
H Bottom Sub 2.50 64 Z 4.3 - 4 TPI Tapered ACME Thread
AGITATOR
31
6w Agitator Assembly
Dim Description In mm Dim Description In mm
A 8 Agitator 152.26 3866 I Top Sub 4.00 102
B Top Sub Length 30.50 775 J Top Sub 5.40 137
C Stator Length 88.2 2240 K Stator ID 6.35 159
D Bottom Sub 33.56 852 L Rotor 72.91 1671
E Top Sub OD 8.00 203 M Rotor OD 2.77 70
F Stator OD 8.00 203 X 6s REG Connection
G Bottom Sub 8.00 203 Y Sub ID Restricted from 1.00 to 2
H Bottom Sub 3.50 89 Z 6.965 - Modified ACME Thread
32
8 Agitator Assembly
Specifications
L
C
A
D
B
M
I
J
X
KZ
Z
X
Y
F
H
G
E
CA
D
B
L
X
M
X
I
F
E
G
KZ
J
H
Y
Z
Dim Description In mm Dim Description In mm
A 9s Agitator 145.30 3690 I Top Sub See above table
B Top Sub Length 27.50 699 J Top Sub 6.80 172
C Stator Length 90.00 2240 K Stator ID 7.85 199
D Bottom Sub 27.80 706 L Rotor 70.60 1793
E Top Sub OD See above table M Rotor OD 4.09 104
F Stator OD 9.62 244 X Top & Bottom Sub See above table
G Bottom Sub See above table Y Sub ID Restricted from 2.00 to 2.50
H Bottom Sub See above table Z 8.500 - Modified ACME Thread
X O.D I.D
6s REG 8.00 3.50
7s REG 9.62 3.00
AGITATOR
33
9s Agitator Assembly
Connection Details
Agitator Size Constant
28, 2a 0.225
2d 0.375
2d, 38, 3a (HF) 0.075
34, 3a, 3w 0.217
4w, 5 0.075
4w (HF), 0.067
62 0.038
6w 0.033
8 0.018
9s 0.013
Agitator Operating Frequencies
Agitator Operating Frequencies
25
23
21
19
17
15
13
11
9
7
5100 200 300 400 500 600 700 800 900 1000 1100 1200
Oper
atin
g Fr
eque
ncy
(Hz)
Flow Rate (gpm)
33
28
23
18
13
8
40 50 60 70 80 90 100 110 120 130 140Ope
ratin
g Fr
eque
ncy
(Hz)
Flow Rate (gpm)
2d
34, 3a, 3w
28, 2a
2d, 38, 3a (HF)
4w Standard4w (HF)626w89s
34
Tool Frequency (Pulse Frequency) at any given flow rate
Frequency (Hz) = Flow rate (gpm) x Constant (see table)
Specifications
Mud Type Elastomer Type
Nitrile HSN (145/OBM) HSN
WBM Yes No Yes
OBM Yes
Elas
tom
er (S
tato
r) Ty
pe
Monoflo Stator/Rotor Selection Guidelines(Synthetic Based Mud)
OB Elastomer RR & PRR Elastomer
Elas
tom
er (S
tato
r) Ty
pe
Monoflo Stator/Rotor Selection Guidelines(Water Based Mud)
RR & PRR Elastomer
Elas
tom
er (S
tato
r) Ty
pe
Monoflo Stator/Rotor Selection Guidelines(Aerated Fluids)
RR & PRR Elastomer
Downhole Temperature deg F (deg C)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
250 (121)
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
250 (121)
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
250 (121)
300 (149)
350 (177)
36
Specifications
AGITATOR
Chemicals/Fluids known to cause elastomer swelling:
Diesel, Crude Oils, Ester based muds Oil based muds should have an aromatic content
38
Other factors to consider:
Elastomer SwellingHigh temperatures will cause elastomer swelling. Undersize rotors must be fitted in a high temperature environment. See selection guideline graph for general rotor choice guidelines. Note that muds known to cause swelling (low aniline point), coupled to a high temperature, may require extra swelling allowance and/or a special elastomer.
The Agitator will have reduced efficiency in aerated fluids due to the compressible nature of gas. Care should also be taken when running the tool in low liquid content to reduce the wear of the power section and components. Lubrication should be added to reduce friction. This will extend life of all components. Lubricants should be thoroughly mixed with water and injected into the drilling medium at a rate of no less than 5% of the drilling medium volume.
Aerated drilling fluids can cause over speeding of the power section which will increase temperature and could lead to premature failure. Ensure sufficient lubricant is added. Generally fluids with >75% liquid content should not cause a problem. Note: the Agitator power section cannot be slowed down by applying WOB as per a drilling motor, since it has no drive output (bit box). The motor may be controlled in such applications but separate consideration must be given to the Agitator.
Explosive decompression of the elastomer can be an issue in aerated fluids; ensure float equipment is installed in the string below the tool in such environments. When explosive decompression is known to be a problem do not run the tool again.
As the particulate content increases, erosion becomes a problem with elastomers and other components. The particulates should be limited to 2%.
Specifications
Aerated Fluids
Explosive Decompression
Particulate Content
AGITATOR
Rotor/Mud Compatibility Rules
The rotor coating material must be compatible with the fluid. Failure to ensure this could lead to rotor damage, in turn leading to stator elastomer damage. The standard rotor coating material is chrome. Environments known to be incompatible with chrome are:
Chloride content
Very low/high ph Do not run chrome plated rotors if the level is 11 pH.
For use in such environments uncoated stainless steel rotors or a tungsten carbide type coating is recommended.
Best practice is to properly flush the tool regardless of mud type.
7.3 Dog Leg Severity (DLS)
Please contact NOV for specific advice.
7.4 Shock Tool Selection
NOV will recommend a shock tool which has been carefully selected and assessed to ensure good performance. Not all shock tools are compatible with the Agitator.
39
When the drilling fluid contains a chloride concentration over 30,000 ppm (30,000 mg/l) the tool must be properly flushed and serviced as soon as possible.Do not run chrome plated rotors in chloride concentrations of > 100,000 ppm (100,000 mg/l).
40
NOV Downhole has the capacity and flexibility to design, produce, and support the industrys leading selection of friction-reduction technology, as well as the expertise to assist our customers to develop their own proprietary technologies.
We understand that our customers must be able to absolutely rely on their supplier to meet their needs wherever they are, and we strive to be the one company that does just that.
Whether it is our commitment to innovation, the quality of our engineering designs, or the availability and performance of our tools and services, being reliable means upholding our commitments every time.
Reliability is core to our organization and our offer. We have high expectations for ourselves, and we will strive to meet your expectations every time.
8. Reliability
AGITATOR
41
1. Introduction ...................................................................2 1.1 Drilling ............................................................2
1.2 Intervention and Coiled Tubing .........................3
2. How It Works ................................................................4
Planning the Job ...............................................................8 3.1 Operating Parameters ......................................8
3.2 Drilling/Completion Fluids ................................8
3.3 MWD ...............................................................8
4. Applications ..................................................................9 4.1 Drilling Applications .........................................9
4.2 Non-Drilling Applications .................................9
4.3 Optimization Service .......................................9
5. Drilling Procedures (Jointed Pipe) ..............................10 5.1 Surface Testing .............................................10
5.2 Testing with MWD Systems ...........................12
5.3 Advice While Drilling ......................................13
5.4 Tool Storage and Handling .............................14
6. Trouble Shooting ........................................................15 6.1 Tool Operation ...............................................15
7. Specifications ............................................................18 7.1 Agitator Specifications ...................................18
7.2 Power Sections
Specifications and Guidelines.........................35
7.3 Dog Leg Severity (DLS) .................................39
7.4 Shock Tool Selection .....................................39
8. Reliability ...................................................................40
Index
2013 National Oilwell Varco
All rights reserved.
D392001828-MKT-001-REV05
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 users risk and are the users responsibility.
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Houston, Texas 77036
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Phone: 713 375 3700
Fax: 713 346 7687
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www.nov.com/downholelocations
[email protected] w w w . n o v . c o m
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