(014)Spacer Stack Calculations rev a

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

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

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What’s a Spring Carrier?
A series of springs that apply pressure to the top of the flow tube to stop it vibrating axially.

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Two types of Spring Carriers

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What makes up a Spacer Stack?
Spacers
5 sizes
1, 0.5, 0.25, 0.1, 0.05 inch

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What makes up a Spacer Stack?
Spacers
2” Baffle Plate

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

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Where does it go?
Flow Tube
Spacer Stack
HOS/HOC
Spring Stack
Spacer Stack

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What happens when it’s the right length?
Correct compression applied to the flow tube assembly.
Flow Tube
Spacer Stack
HOS/HOC
Spring Stack
Spacer Stack

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What happens if it’s too short?
Flow tube assembly can move up and down axially
Vibration damages tool
Tool failure
Flow Tube
Spacer Stack
HOS/HOC
Spring Stack
Spacer Stack

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What happens if it’s too long?
Flow tube can be crushed
Tool failure
Flow Tube
Spacer Stack
HOS/HOC
Spring Stack
Spacer Stack

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

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
What Do I Do With The Measurements?
Fill in the Spacer Stack Calculation Form (to view click link below)

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
HOC/HOS Bore Depth
Pin Ring
Pin
Ruler
A

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
HOC/HOS Bore Depth
50.35

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Flow Tube Length
B

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Flow Tube Length
50.35
35.65

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
A
B
Check Dimension C
C = A - B
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.
B
C

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
50.35
35.65
14.7

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Spring Stack Length and Type
D

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Spring Stack Length
50.35
35.65
14.7
5.60

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Pin Length
E

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Pin Length
50.35
35.65
14.7
5.60
4.40

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
D
Exact Height
(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
C
E
Spring Stack

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
50.35
35.65
14.7
5.60
4.40
5.325

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
Final Check Dimension F
F = E - Compression
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.
E
Spacers
F
Spring Stack
2” Baffle Plate

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
Calculations
50.35
35.65
14.7
5.60
4.40
5.325
4.40
3.775

© 2001, Halliburton Energy Services, Inc.
April 16, 2001
How much Compression?
Softmount 1200 and 650 System
0.625 inch or 16 mm
Softmount Slimhole System
0.400 inch or 10 mm

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

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

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

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