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 Contents 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 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. Introduction 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
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.
Fig. 1 3
2. How it Works The Agitator system relies on three main mechanisms: 1. Power section 2. Valve and bearing section 3. Excitation section: • Running on jointed pipe = use a shock tool • Running on coiled tubing = coiled tubing does the shock tool’s job
Shock Tool
Power Section
Valve & Bearing Section
Fig. 2 4
AGITATOR
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)
P (psi)
P = pressure drop across valve plates t = time 1. Valve moves to one extremity TFA minimized = pressure peak t (sec)
P (psi) 2. Valve moves to center TFA maximized = pressure trough t (sec)
P (psi)
3. Valve moves to other extremity TFA minimized = pressure peak
t (sec) Fig. 3. Relative positions of valve plates 5
How It Works 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)
6
AGITATOR
Springs
Seal Area
Fig. 4 Shock Tool
7
3. Planning The Job 3.1 Operating Parameters Customers are requested to complete a simple Agitator prejob 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. Applications 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 Service If 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
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 Testing The tool should not be surface tested if the temperature is below 14ºF (-10ºC). There is a high risk of damaging the elastomer. Hot Hole Tools Testing The 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
Pulses converted to axial displacement
Shock Tool
Pulses act on pump open seal area
Agitator
Pulse generated at operating frequency
Power Section
Pressure Drop
Valve & Bearing Section
Fig. 5. Agitator 11
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” (3–10 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 Operator’s pulse detection screen.
12
AGITATOR
5.3 Advice While Drilling Weight on Bit The 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 32°F (0°C). Short duration below freezing will be unavoidable when transporting to the field or on stand-by but long term storage should be above 32°F (0°C). Assembled tools should not be stored in temperatures below 14ºF (-10ºC) 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 Agitator’s 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 6.1 Tool Operation Recognizing How the Tool is Working If 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.
Section through a 1:2 PDM
Section through a 5:6 PDM Fig. 6
15
Trouble Shooting Using the MWD Oscilloscope to Monitor Agitator Frequency The Agitator’s frequency can be monitored on the MWD oscilloscope (See Fig 7). Normally a spike will be apparent at the Agitator’s 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. Example MWD Trace 0.31
Amplitude
0.25 0.19 0.12 0.06 0.0
5.0
10.0
15.0
Frequency
20.0
25.0 Fig. 7
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).
16
AGITATOR
Example MWD Trace 0.31
Amplitude
0.25 0.19 0.12 0.06 0.0
5.0
10.0
15.0
Frequency
20.0
25.0 Fig. 8
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
17
18
12” AMMT pin/box
302°F (150°C)
9 Hz @ 40 gpm
600-800 psi
20,000 lbs
12” AMMT pin/box
Temp Range*
Operating frequency
Operational Pressure drop generated
Max Pull
Connections
* Higher temperatures available on request
20,000 lbs
40-80 gpm
Recommended Flow Range
600-800 psi
9 Hz @ 40 gpm
302°F (150°C)
40-80 gpm
90 lbs
6 ft
6 ft
80 lbs
2a”
Overall Length
28”
Weight
Tool Size (OD)
2a” PAC-DSI pin/box
85,000 lbs
600-800 psi
15 Hz @ 40 gpm
302°F (150°C)
40-80 gpm
100 lbs
5w ft
2d”
302°F (150°C)
40-140 gpm
125 lbs
7 ft
38” (HF)
302°F (150°C)
90-140 gpm
125 lbs
62 ft
3a”
302°F (150°C)
40-140 gpm
145 lbs
7 ft
3-a” (HF)
2a” PAC-DSI pin/box
85,000 lbs
500-700 psi
2a” REG pin/box
120,000 lbs
500-700 psi
160,000 lbs 2a” REG pin/box or 2d” REG pin/box
2a” REG pin/ box or 2d” REG pin/box
500-700 psi
150,000 lbs
450-700 psi
9 Hz @ 120 gpm 9 Hz @ 120 gpm 26 Hz @ 120 gpm 9 Hz @ 120 gpm
302°F (150°C)
40-140 gpm
100 lbs
7 ft
2d” (HF)
7. Specifications
7.1 Agitator Specifications
550-650 psi
500,000 lbs
4” GRANT PRIDECO 42” XH, 4” IF XT39 pin/box pin/box or NC46 pin/box
550-650 psi
302°F (150°C)
26 Hz @ 120 gpm
500-700 psi
230,000 lbs *depending 260,000 lbs on service connection
2a” IF, 2d” IF 2d” AMOH, 2d” REG 32” IF pin/box pin/box
Temp Range*
Operating frequency
Operational Pressure drop generated
Max Pull
Connections
302°F (150°C)
302°F (150°C)
375-475gpm
570,000 lbs
600-700 psi
1,600 lbs
11 ft
8”
42” IF pin/box
570,000 lbs
600-700 psi
302°F (150°C)
600-1100 gpm
2,000 lbs
12 ft
9s”
1,145,000 lbs
600-800 psi
7s” REG box up 6s” REG pin/box 7s” REG pin down or NC-56 pin/box or 6s” REG pin down
930,000 lbs
600-800 psi
16 Hz @ 900 gpm 12-13 Hz @ 900 gpm
302°F (150°C) 302°F (150°C)
400-600 gpm 500-1,000 gpm
1,000 lbs
9 ft
6w”
16-17 Hz @ 18-19 Hz @ 250 gpm 16-17 Hz @ 250 gpm 15 Hz @ 400 gpm 500 gpm 16-17 Hz @ 250 gpm
302°F (150°C)
150-270 gpm 250-330 gpm
150-270 gpm 250-330 gpm
90-140 gpm
900 lbs
Recommended Flow Range
498 lbs
310 lbs
6 ft
62”
240 lbs
8w ft
5” (High TORQUE)
Weight
8w ft
4w” (High Flow)
122 ft
3w”
Overall Length
Tool Size (OD)
AGITATOR
19
Specifications 28” Agitator Assembly X
ØE
B
ØI ØJ Z ØK
F
C A L
ØG D
ØH X Dim Description
In
mm
Dim Description
In
mm
A
28” Agitator
72.90
1852
ØH
Bottom Sub
1.00
25
B
Top Sub Length 7.90
201
ØI
Top Sub
1.25
32
C
Stator Length
57.00
1448
ØJ
Top Sub
1.45
37
D
Bottom Sub Length
8.00
203
ØK
Stator I.D.
1.75
44
ØE
Top Sub
2.12
54
L
Rotor
44.30 1125
ØF
Stator
2.12
54
X
12” AMMT Connection
ØG
Bottom Sub
2.12
54
Z
1.820” 10-3G Stub ACME Thread
20
AGITATOR
2a” Agitator Assembly X
ØE
B
ØI ØJ Z ØK
F
C A L
ØG D ØH X Dim Description
In
mm
Dim Description
In
mm
A
2a” Agitator
72.90
1852
ØH
Bottom Sub
1.00
25
B
Top Sub Length
7.90
201
ØI
Top Sub
1.25
32
C
Stator Length
57.00
1448
ØJ
Top Sub
1.45
37
D
Bottom Sub Length
8.00
203
ØK
Stator I.D.
1.75
44
ØE
Top Sub
2.38
60
L
Rotor
46.56 1183
ØF
Stator
2.38
60
X
12” AMMT Connection
ØG
Bottom Sub
2.38
60
Z
1.820” 10-3G Stub ACME Thread
21
Specifications 2d” Agitator Assembly
X
ØE B
ØI ØJ Z ØK ØF
C
M L
A
Y Z ØG D ØH X Dim Description
In
mm
Dim Description
In
mm
A
2d” Agitator
69.00 1753
ØI
Top Sub
1.25
32
B
Top Sub Length
8.00
ØJ Top Sub
2.06
527
C
Stator Length
53.00 1346
2.44
624
D
Bottom Sub Length
8.00
203
ØE Top Sub
2.88
73
ØF Stator
2.88
73
X
2a” PAC-DSI Connection
ØG Bottom Sub
2.88
73
Y
Sub ID Restricted from 0.550” to 0.90”
ØH Bottom Sub
1.25
32
Z
2.550” 8-3G Stub ACME Thread
22
203
ØK Stator I.D. L
Rotor
ØM Rotor OD
44.35 1126 1.10
28
AGITATOR
2d” Agitator Assembly (HF) X
ØE B
ØI ØJ Z ØK
Z M
C A
L
ØF
Y Z ØG
D
ØH X
Dim Description
In
A
2d” Agitator
85.60 2174
mm
Dim Description
In
mm
ØI
Top Sub
1.25
B
Top Sub Length 8.00
32
ØJ
Top Sub
2.06
C
Stator Length
52
70.00 1778
ØK
Stator I.D.
2.44
62
D
Bottom Sub Length
7.60
193
L
Rotor
61.20 1554
ØE
Top Sub
2.88
73
ØM
Rotor OD
1.12
ØF
Stator
2.88
73
X
2a” PAC-DSI Connection
ØG
Bottom Sub
2.88
73
Y
ØH
Bottom Sub
1.25
32
Z
203
28
Sub ID Restricted from 0.60” and 0.90” 2.550” Stub ACME Thread
23
Specifications 38” Agitator Assembly (HF) X
ØE B
ØI ØJ Z ØK
M
C A
L
ØF
Y Z ØG
D
ØH X Dim Description
In
Dim Description
In
mm
A
38” Agitator
85.85 2181
ØI
Top Sub
1.25
32
B
Top Sub Length
8.00
ØJ
Top Sub
2.06
52
C
Stator Length
70.00 1778
ØK
Stator I.D.
2.44
62
D
Bottom Sub Length
7.850 199
L
Rotor
61.20 1554
ØE
Top Sub
3.13
80
ØM
Rotor OD
1.12
ØF
Stator
3.13
80
X
2a” REG Connection
ØG
Bottom Sub
3.13
80
Y
Sub ID Restricted from 0.60” and 0.90”
ØH
Bottom Sub
1.25
32
Z
2.650” Stub ACME Thread
24
mm 203
-
28
-
AGITATOR
3a” Agitator Assembly ØE
Y
B
ØH
ØI
C M
A
L
ØJ
Z
D
ØG ØK X 3a” Agitator Assembly with 2d” REG Connection Dim
Description
In
mm
Dim
Description
In
mm
A
3a” Agitator
77.05
1957
ØI
Stator
2.75
70
B
Top Sub
15.75
400
ØJ
Bottom Sub
1.586 40
C
Stator
48.00
1219
ØK
Bottom Sub
1.50
D
Bottom Sub
13.30
338
L
Rotor
39.00 990
ØE
Top Sub
3.50
89
X
2d” Reg Pin Connection
ØF
Stator
3.38
86
Y
2d” Reg Box
ØG
Bottom Sub
3.50
89
Z
2.875” 8-3G Stub ACME
ØH
Top Sub
1.60
41
-
38
-
25
Specifications 3a” Agitator Assembly (HF) X
ØE B
ØI ØJ Z ØK
M
C A
L
ØF
Y Z ØG
D
ØH X Dim Description
In
Dim Description
In
mm
A
3a” Agitator
84.73 2152
ØI
Top Sub
1.6
41
B
Top Sub Length
8.00
ØJ
Top Sub
2.00
51
C
Stator Length
70.00 1778
ØK
Stator I.D.
2.44
62
D
Bottom Sub Length
6.73
1714
L
Rotor
61.20 1554
ØE
Top Sub
3.50
89
ØM
Rotor OD
1.12
ØF
Stator
3.38
86
X
2a” REG Connection
ØG
Bottom Sub
3.50
89
Y
ØH
Bottom Sub
1.50
38
Z
26
mm 203
Sub ID Restricted from 0.60” and 0.90” 2.875” Stub ACME Thread
28
-
AGITATOR
3w” Agitator Assembly X
ØE
ØK B
ØF L Z M
ØG
O
A
N C Y Z ØH D
Connection Option 2a” IF X
ØI ØJ
2d” IF 2d” AMOH
X
2d” REG Dim Description
In
mm
Dim Description
In
mm
A
3w” Agitator
151
3835
ØK
Top Sub ID
1.50
38
B
Top Sub Length
51.30 1303
ØL
Top Sub ID
2.13
54
C
49.60 1260
ØM
Stator ID
2.75
70
51.00 1296
N
Rotor Length
38.98 990
ØE
Stator Length Bottom Sub Length Top Sub OD
4.00
102
O
Rotor OD
1.12
ØF
Top Sub OD
3.75
95
P
Top Sub Fishing 12.00 305 Neck
ØG
Stator OD
3.75
95
X
See above table
ØH
Bottom Sub OD
3.75
95
Y
Sub ID Restricted between 0.725” and 0.875”
ØI
Bottom Sub OD
4.00
102
Z
Modified PAC Connection
ØJ
Bottom Sub ID
1.50
38
D
29
27
Specifications 4w” Agitator Assembly Standard and High Flow X
ØE B
ØI ØJ Z ØK
M
C A
L
ØF
Y Z ØG
D
ØH X
Dim Description
In
mm
A
105
2667 ØI
4w” Agitator
Dim Description Top Sub ID
In
mm
2.25
57
B
Top Sub Length 18
457
ØJ
Top Sub
3.35
85
C
Stator Length
1727 ØK
Stator ID
3.84
97
68
D
Bottom Sub
19
483
L
Rotor Length
54.07 1373
ØE
Top Sub OD
4.75
121
ØM
Rotor OD
1.64
ØF
Stator OD
4.75
121
X
32” IF Connection Sub ID Restricted from 1.00” to 1.35”
ØG
Bottom Sub OD 4.75
121
ØY
ØH
Bottom Sub ID 2.00
51
Z
28
42
4.3” - 4 TPI Tapered ACME Thread
AGITATOR
5” Agitator Assembly X
ØE
ØK
B
ØF
ØL Z ØM
C N
A
O ØG
Y Z
ØH
D
ØI ØJ
X
Dim Description
In
A
134.14 3407 ØJ
5” Agitator
mm
B
Top Sub Length 31.50 800
C
Stator Length
68
Dim Description Bottom Sub ID
In
mm
2.00
51
ØK
Top Sub ID
2.25
57
1727 ØL
Top Sub ID
2.75
70 98
D
Bottom Sub
34.64 880
ØM
Stator ID
3.84
ØE
Top Sub OD
5.00
127
N
Rotor Length
54.07 1373
ØF ØG
Flex Profile OD 4.00 Stator OD 5.00
102 127
O X
Rotor OD 1.64 42 XT 39 Connections Sub ID Restricted from 1.00” to 1.35” 4.3” - 4 TPI Tapered ACME Thread
ØH
Flex Profile OD 4.00
102
ØY
ØI
Bottom Sub OD 5.00
127
Z
29
Specifications 62” Agitator Assembly X
ØE
ØK ØF
B
ØL Z ØM
C N
A
O ØG
Y Z
D ØH ØI ØJ
X Dim Description
In
A
180.88 4594 ØJ
62” Agitator
mm
Dim Description Bottom Sub ID
In
mm
2.50
64
B
Top Sub Length 51.08 1297 ØK
Top Sub ID
2.50
64
C
Stator Length
Top Sub ID
2.50
64 127
83.00 2108 ØL
D
Bottom Sub
46.80 1189 ØM
Stator ID
5.00
ØE
Top Sub OD
6.50
Rotor Length
64.00 1628 2.30
165
N
ØF
Flex Profile OD 4.77
121
O
Rotor OD
ØG
Stator OD
6.50
165
X
XT 39 Connections
ØH
Flex Profile OD 4.77
121
ØY
Sub ID Restricted from 1.30” to 1.70”
ØI
Bottom Sub OD 6.50
165
Z
Service Connection (mod pac 1.5” TPF
30
58.4
AGITATOR
6w” Agitator Assembly X
ØE B
ØI ØJ Z ØK
M
C
L
A
ØF
Y Z D ØG ØH X
Dim Description
In
A
113.0 2870
6w” Agitator
B
Top Sub Length 18.0
C
Stator Length
mm 457
72.00 1829
Dim Description
In
mm
ØI
Top Sub
2.81
71
ØJ
Top Sub
4.63
118
ØK Stator ID
5.57
141
D
Bottom Sub
22.50 572
L
ØE
Top Sub OD
6.75
ØM Rotor OD
ØF
Stator OD
6.75
171
X
ØG
Bottom Sub
6.75
171
ØY
ØH
Bottom Sub
2.50
64
Z
171
Rotor
57
1448
2.57
65
42” IF Connection Sub ID Restricted from 1.00” to 1.35” 4.3” - 4 TPI Tapered ACME Thread
31
Specifications 8” Agitator Assembly X ØE ØI
B
ØJ Z ØK
A M C L
ØF
Y Z
D ØG ØH X
Dim Description
In
A
8” Agitator
152.26 3866
Dim
Description
In
mm
ØI
Top Sub
4.00
B
Top Sub Length 30.50
102
775
ØJ
Top Sub
5.40
C
Stator Length
137
88.2
2240
ØK
Stator ID
6.35
D
159
Bottom Sub
33.56
852
L
Rotor
72.91 1671
ØE
Top Sub OD
8.00
203
ØM
Rotor OD
2.77
ØF
Stator OD
8.00
203
X
ØG
Bottom Sub
8.00
203
ØY
ØH
Bottom Sub
3.50
89
Z
6s” REG Connection Sub ID Restricted from 1.00” to 2” 6.965” - Modified ACME Thread
32
mm
70
AGITATOR
9s” Agitator Assembly X
ØE B
ØI
ØJ Z ØK C
M
A
L
ØF
Z Y
D Connection Details X
O.D
6s” REG
8.00” 3.50”
I.D
7s” REG
9.62” 3.00”
ØG ØH X
Dim Description
In
A
9s” Agitator
145.30 3690
mm
Dim
Description
In
ØI
Top Sub
See above table
B
Top Sub Length 27.50
C
Stator Length
90.00
D
Bottom Sub
27.80
699
ØJ
Top Sub
6.80
172
2240
ØK
Stator ID
7.85
199
706
L
Rotor
70.60 1793
Rotor OD 4.09 104 Top & See above table Bottom Sub Sub ID Restricted from 2.00” to 2.50” 8.500” - Modified ACME Thread
ØE
Top Sub OD
See above table
ØM
ØF
Stator OD
9.62
X
ØG
Bottom Sub
See above table
ØY
ØH
Bottom Sub
See above table
Z
244
mm
33
Specifications Tool Frequency (Pulse Frequency) at any given flow rate Frequency (Hz) = Flow rate (gpm) x Constant (see table) 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 4w” Standard 4w” (HF) 62” 6w” 8” 9s”
Agitator Operating Frequencies 25
Operating Frequency (Hz)
23 21 19 17 15 13 11 9 7
5 100 200 300 400 500 600 700 800 900 1000 1100 1200
Flow Rate (gpm)
Agitator Operating Frequencies
2d” 34”, 3a”, 3w”
Operating Frequency (Hz)
28”, 2a” 2d”, 38”, 3a” (HF)
33 28 23 18 13 8
40 50 60 70 80 90 100 110 120 130 140
Flow Rate (gpm) 34
AGITATOR
7.2 Power Section Specifications and Guidelines General Elastomer/Mud Compatibility Rules Mud Type
Elastomer Type Nitrile
HSN (145/OBM)
HSN
Yes
No
Yes
OBM
Yes
<10% water content
Yes
Synthetic OBM (SOBM)
Yes
<10% water content
Yes
WBM
Stator/Rotor Selection Guidelines
Elastomer (Stator) Type
R&M Stator/Rotor Selection Guidelines
Standard HT XHT
Nitrile HSN
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
250 (121)
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
Elastomer (Stator) Type
Monoflo Stator/Rotor Selection Guidelines (Oil Based Mud)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
250 (121)
OB Elastomer RR Elastomer
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
35
Specifications
Elastomer (Stator) Type
Monoflo Stator/Rotor Selection Guidelines (Synthetic Based Mud)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
OB Elastomer RR & PRR Elastomer
250 (121)
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
Elastomer (Stator) Type
Monoflo Stator/Rotor Selection Guidelines (Water Based Mud)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
RR & PRR Elastomer
250 (121)
300 (149)
350 (177)
Downhole Temperature deg F (deg C)
Elastomer (Stator) Type
Monoflo Stator/Rotor Selection Guidelines (Aerated Fluids)
0 (0)
50 (10)
100 (38)
150 (66)
200 (93)
RR & PRR Elastomer
250 (121)
Downhole Temperature deg F (deg C)
36
300 (149)
350 (177)
AGITATOR
Chemicals/Fluids known to cause elastomer swelling: • Diesel, Crude Oils, Ester based muds • Oil based muds should have an aromatic content <2% • Drilling fluids which are too acidic (pH<4) or too alkaline (pH>11); fluids close to these boundaries can be used but circulation must be maintained to reduce damage to the elastomer. It is important to properly flush with soapy solution and service the tools as soon as possible. A remedial action when running in the above situation would be adjusting the power section “fit”. This is done by utilizing undersize rotors which allows the elastomer to swell, thus reducing stress on the elastomer. To be sure of elastomer compatibility and power section fit, NOV can conduct compatibility tests. Note: using an undersize rotor has the same effect as using an oversize stator.
37
Specifications Other factors to consider: • Elastomer Swelling High 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. • Aerated Fluids 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 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. • Particulate Content As the particulate content increases, erosion becomes a problem with elastomers and other components. The particulates should be limited to 2%. 38
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 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). • Very low/high ph Do not run chrome plated rotors if the level is <4 pH or >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
8. Reliability NOV Downhole has the capacity and flexibility to design, produce, and support the industry’s 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.
40
AGITATOR Index 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
41
Downhole Solutions
Drilling Solutions
Engineering and Project Management Solutions
Industrial Solutions
Corporate Headquarters
Lifting and Handling Solutions
7909 Parkwood Circle Drive Houston, Texas 77036 United States Phone: 713 375 3700 Fax: 713 346 7687 Production Solutions
For a complete list of NOV Downhole locations, visit us online: www.nov.com/downholelocations
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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.
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