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kwik-ZIP®

Centralizers in use

Inert Centralizer Systems for the Drilling Industry

Installation Guide for 155 and 380 Series Casing Centralizer

Installation Instructions

Each 155 Series kwik-ZIP® centralizer segment has an effective maximum coverage of approximately 6.1" (6.1" circumference). Each 380 Series segment covers a maximum circumference of approximately 14.96".

The tables below indicate the number of 155 Series and 380 Series kwik-ZIP® central segments required and the approximate setting position for various pipe diameters.

Size Table and Setting Guide

155 Series
380 Series
Outside Diameter
of Casing
(inches)
Number of Segments
Approximate Setting Guide Position
Outside Diameter
of Casing
(inches)
Number of Segments
Approximate Setting Guide Position
2.362
2
5
6.299
2
5
2.756
2
15
6.693
2
20
3.150
2
35
7.087
2
35
3.543
2
50
7.480
2
50
3.937
3
10
7.874
2
65
4.331
3
20
8.268
2
85
4.724
3
30
8.661
2
100
5.118
3
40
9.449
3
0
5.512
3
50
10.236
3
20
5.905
4
25
10.630
3
35
6.299
4
30
11.811
3
65
6.693
4
40
12.598
3
85
7.087
4
45
13.386
3
105

CAUTION: kwik-ZIP® centralizers should not be exposed to a naked flame or sparks from welding. Failure to shield the product whilst welding may result in ignition of the material or damage to the centralizer.

 

NOTE: Setting details shown are intended as a guide only. For casing and screen diameters not shown in the tables, use the formula outlined below to calculate the approximate setting position.

14.173
4
30
14.961
4
45
15.748
4
60
16.142
4
70
17.323
4
95
18.110
4
110
18.898
5
50
20.079
5
70
20.472
5
75
21.260
5
85
22.047
5
100
22.835
5
110
23.622
6
60
24.016
6
65
25.197
6
80
25.984
6
90
26.772
6
105
27.559
6
110
27.953
7
65
29.921
7
90

If the diameter of your casing is not listed on the above tables, the setting guide position listed for the diameter closest to that of your casing can be used as a guide. Alternatively, the following formula may be used to calculate the approximate setting guide position.

Where: D = Outside Diameter of Casing (inch)

Where: N = Number of kwik-ZIP® centralizer segments,

155 Series: Suggested Setting Guide Position = [({D+4} x 22/7) ÷ N] - 98

380 Series: Suggested Setting Guide Position = [({D+6} x 22/7) ÷ N] - 258

Centralizer segment diagram

Fastening tool locking reinforced tabs at rear of female couplingStep 1 - When you have established the appropriate setting guide position (see table), place the segments on a flat surface and insert the male section of each segment into the female coupling on the next segment, as indicated by the arrows in the above diagram (diagram shows 155 Series kwik-ZIP® Centralizer).

Step 2 - Line the leading edge of each female coupling up with the appropriate number on the Setting Guide.

Step 3 - Once all settings are set, they can be wrapped around the casing and the final joints can be fastened. This method allows the centralizer to be made up mostly by hand. The setting tool should only be required to tighten the last joint once the segments are fixed to the casing. It is recommended that this final installation occur when the casing is hanging in the mast.

NOTE: The setting tool locks in behind the reinforced tabs at the rear of the female coupling. Open the jaws on the setting tool enough to reach the nearest tool lug and tension the centralizer collars enough to ensure that they will not move on the casing. Do not over tension the collars.

Trimming excess length with snipsStep 4 - If necessary, adjust the bow height before fully tightening the last two couplings. This can be done by changing the distance between the top and bottom centralizer collars. (The bow height is preset to 1.18"; however, a rigid spacer under each bow ensures that the bows cannot collapse to less than 0.59").

Step 5 - Once the centralizer has been tightened with the fastening tool, ensure that any excess length on the setting guide section of each segment is trimmed. This is easily done with a pair of tin snips or garden clippers and will ensure that the centralizer does not snag on formation when the casing is installed in the well.

NOTE: Snips are provided with the setting tool kit. The excess collar length should be trimmed as close as possible to the coupling.

Regulations regarding the use of centralizers vary between states; however, it is considered best practice to use one centralizer for each length of casing and screen. The Ground Water Well License / Bore License (if applicable) in many states also requires one centralizer for each length of casing.

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Product Selection Guide

This installation Guide applies to the 155 Series and 380 Series kwik-ZIP® centralizers. The 155 Series is recommended for casing with an outside diameter between 2.36" and 6.3". Although the 155 Series can be used on casings with an outside diameter above 6.3", it is recommended that the 380 Series be used for casings with an outside diameter above 6.3".

The table below details recommended maximum formation temperatures:

Model and Pre-Set Bow Height
Max Formation Temperature
Recommended for Use on Casing OD Nominal Diameter Range
155 LT-D (1 3/16")
104° F
2" to 6"
155 HT-D (1 3/16")
176° F
2" to 6"
155 LT-E (2")
104° F
2" to 6"
155 HT-E (2")
176° F
2" to 6"
 
380 HT-D (1 3/16")
176° F
6" and above
380 HT-E (2")
176° F
6" and above
380 HT-F (4")
176° F
6" and above

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