Spacer Stack Calculations Objectives

1. LWD 1

Spacer Stack Calculations
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
1

2. Spacer Stack Calculations Objectives

At the completion of this presentation you should be able to:
1. Describe the purpose of the spacer stack.
2. Describe the measurements that are required.
3. Select the correct length of spacer stack within the tolerance of the system.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
2

3. What’s a Spacer Stack?

• A series of washers that fill the
space between the top of spring
carrier and the pin of the drill
collar above the tool.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
3

4. What’s a Spring Carrier?

A series of
springs that apply
pressure to the
top of the flow
tube to stop it
vibrating axially.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
4

5. Two types of Spring Carriers

650 spacer stack
#032810 solar
(Hardmount)
April 16, 2001
#412811 standard
(Softmount)
© 2001, Halliburton Energy Services, Inc.
5

6. Two types of Bottom Rings

April 16, 2001
© 2001, Halliburton Energy Services, Inc.
6

7. Slim Spring Carriers Slim hard Slim soft spring

Slim Spring Carriers
Slim hard
April 16, 2001
Slim soft spring
© 2001, Halliburton Energy Services, Inc.
7

8. Slim Bottom Rings Slim hard Slim soft

Slim Bottom Rings
Slim hard
April 16, 2001
Slim soft
© 2001, Halliburton Energy Services, Inc.
8

9. What makes up a Spacer Stack?

Spacers
– 5 sizes
– 1, 0.5, 0.25, 0.1,
0.05 inch
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
9

10. What makes up a Spacer Stack?

Spacers
2” Baffle Plate
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
10

11. What does it do?

• Applies the correct compression to
the top of the flow tube (1200, 650 &
Slimhole only) when the collar above
is installed.
– Too much compression will crush the flow
tube
– Too little compression allows axial movement
• Superslim uses an adjustable spacer.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
11

12. Where does it go?

Spacer Stack
Spring Stack
Flow Tube
HOS/HOC
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
12

13. What happens when it’s the right length?

• Correct
compression
applied to the
flow tube
assembly.
Spacer Stack
Spring Stack
Flow Tube
HOS/HOC
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
13

14. What happens if it’s too short?

• Flow tube
assembly can
move up and
down axially
• Vibration
damages tool
• Tool failure
April 16, 2001
Spacer Stack
Spring Stack
Flow Tube
HOS/HOC
© 2001, Halliburton Energy Services, Inc.
14

15. What happens if it’s too long?

• Flow tube can
be crushed
• Tool failure
Spacer Stack
Spring Stack
Flow Tube
HOS/HOC
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
15

16. Measurements

• Measure
– HOS/HOC bore depth from connection
face to pin ring
– Flow Tube length from bottom ring
shoulder to face of Fish Neck
– Spring stack length and type
– Drill collar pin length
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
16

17. What Do I Do With The Measurements?

• Fill in the Spacer Stack
Calculation Form (to view click
link below)
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
17

18. HOC/HOS Bore Depth

Ruler
A
Pin
Pin Ring
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
18

19. HOC/HOS Bore Depth

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
HOC/HOS Bore Depth
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
–
–
Check Dimension C = A – B
C =
=
=
D –
–
–
E –
–
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
+0.625"
=
–0.325"
=
=
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
19

20. Flow Tube Length

B
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
20

21. Flow Tube Length

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Flow Tube Length
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
=
=
D –
–
–
E –
–
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
+0.625"
=
–0.325"
=
=
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
21

22. Calculations

C
Check Dimension C
C=A-B
A
After installing the flow tube
assembly, measure from the face
of the HOS/HOC connection to the
top of the fish neck.
If this measurement equals C the
flow tube assembly is properly
seated.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
B
22

23. Calculations

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Calculations
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
= 14.7
=
D –
–
–
E –
–
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
+0.625"
=
–0.325"
=
=
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
23

24. Spring Stack Length and Type

D
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
24

25. Spring Stack Length

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Spring Stack Length
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
= 14.7
=
D –
–
E –
–
D
Spring Stack Length
5.60
–
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
–
+0.625"
=
–0.325"
=
=
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
25

26. Pin Length

E
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
26

27. Pin Length

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Pin Length
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
= 14.7
=
D –
–
5.60
–
E –
–
4.40
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
+0.625"
=
–0.325"
=
=
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
27

28. Calculations

E
C
Exact Height
D
(No spring stack compression)
=C-D-E
However, we must compress the spring
stack. The amount of compression must
be added.
Spacer Stack Height
= C - D - E + Compression
Spring Stack
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
28

29. Calculations

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Calculations
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
= 14.7
=
D –
–
5.60
–
E –
–
4.40
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
+0.625"
=
–0.325"
=
5.325 =
–0.625"
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
–0.625"
=
±0.1"
±0.1"
29

30. Calculations

E
Calculations
F
2” Baffle Plate
Final Check Dimension F
F = E - Compression
Spacers
After installing the flow tube, spring
stack, and spacer stack (includes 2”
baffle plate), measure from the face of
the HOS/HOC connection to the top of
the 2” baffle plate.
If this measurement is different from F
by more than the installation tolerance
STOP.
Spring Stack
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
30

31. Calculations

Top Pin
Top of 2"
Baffle Plate
Top of Pin Ring in
Sub & Shoulder of
Bottom Ring
Note: Measure the spring stack length while taking up slack in disk springs by hand. All measurements
in inches.
Top of Spring
Stack
Top of
Fishneck
Calculations
Slimhole
(Hard Mount)
650
System
1200
System
MWD Run No.
HOS/HOC Serial No.
HOS/HOC Bore Depth to Pin Ring
A
50.35
A
B
Flow Tube Length
B –
– 35.65
–
Check Dimension C = A – B
C =
= 14.7
=
D –
–
5.60
–
E –
–
4.40
–
D
Spring Stack Length
E
Top Pin Length
+0.325"
Compression
Spacer Stack Height = C – D – E + Compression
Top Pin Length
E
Compression
Check Dimension F = E – Compression
F
Installation Tolerance
April 16, 2001
=
=
–0.325"
=
=
±0.05"
© 2001, Halliburton Energy Services, Inc.
+0.625"
+0.625"
–0.625"
–0.625"
±0.1"
±0.1"
5.325 =
4.40
3.775 =
31

32. How much Compression?

• Softmount 1200 and 650 System
– 0.625 inch or 16 mm
• Softmount Slimhole System
– 0.400 inch or 10 mm
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
32

33. How much Compression?

• Hardmount 1200 System
– 0.450 inch or 11 mm
• Hardmount 650 System
– 0.200 inch or 5 mm
• Hardmount Slimhole System
– 0.300 inch or 8 mm
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
33

34. How accurate do I need to be?

• Softmount 1200 and 650 System
Installation Tolerance
– +/- 0.1 inch or +/- 3.0 mm
• Softmount Slimhole System
Installation Tolerance
– +/- 0.05 inch or +/- 1.0 mm
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
34

35. How accurate do I need to be?

• Hardmount
Installation Tolerance
Slimhole, 650, 1200 Systems
– + 0.05 / - 0.0 inch or + 1.0 / - 0.0 mm
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
35

36.

Drill Collar
Check Dimension F
2” Baffle Plate
Check Dimension C
Spacers
Spring Stack
Flow Tube
HOS/HOC
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
36

37. Spacer Stack Calculations Objectives

At the completion of this presentation you should be able to:
1. Describe the purpose of the spacer stack.
2. Describe the measurements that are required.
3. Select the correct length of spacer stack within the tolerance of the system.
April 16, 2001
© 2001, Halliburton Energy Services, Inc.
37