Slotted Casing

Slotted Casing

Slotted casing pipe is a method of cutting multiple longitudinal or spiral straight-arranged and staggered slits of certain specifications on oil casing or tubing in various ways. It is made by using a special ultra-thin cutting sheet and beam cutting, with a slit width (0.2-0.5mm). The cross-sections of the seams are rectangular, trapezoidal (trapezoid angle is 3-8 degrees) and special shapes (round holes), etc., which can ensure the permeability of 0.5%-10%. The layout of the seams can be processed according to user requirements.

Size

The minimum slot width for straight or keystone slots is 0.012 inches, and the maximum slot width is 0.25 inches.

1.5 Inch Long 2.0 to 2.5 Inch Long 2.5 Inch Long
0.012 inch wide 0.024 inch wide 0.078 inch wide
0.015 inch wide 0.025 inch wide 0.125 inch wide
0.016 inch wide 0.038 inch wide 0.250 inch wide
0.018 inch wide 0.048 inch wide
0.058 inch wide

Slotting patterns

Three distinct slot layouts have been created to accommodate distinct traits (shown below). In comparison to staggered and straight slot patterns, the gang slot design significantly improves the liner’s resistance to lateral buckling and collapse stresses.




Staggered Slotted Liner
Gang Slotted Liner
Straight Slotted Liner
Staggered slots are evenly distributed around the circumference with an offset
Gang slots are made up of many slots that are dispersed around the perimeter
Straight slotted liner features slot columns spaced evenly around the circumference without offset

Slot types

- Straight Slots

This slot type is cut perpendicular to the liner and has the same diameter from the inside to the outside of the wall. While straight slots are less expensive to build, they are less effective in containing sand than keystone slots.


- Keystone Slots
Keystone slots, or tapered slots, are cut at a little angle and are larger on the inside than on the outside, ensuring that any particle entering the slot can pass freely without clogging it.

While keystone slots are more expensive to manufacture than straight slots, they eliminate the danger of production losses caused by filled liner slots.

Specification table

Specification & Size of Tubing Slotted Liner
DN O.D. Weight W.T. End Processing
Non-upset coupling-thread Upset coupling-thread Steel Grade
Inch mm lb./ft. lb./ft. Inch mm H40 J55 L80 N80 C90 T95 P110
2 3/8 2.375 60.32 4.00 0.167 4.24 PU PN PN PN PN PN
4.60 4.70 0.190 4.83 PNU PNU PNU PNU PNU PNU PNU
5.80 5.95 0.254 6.45 PNU PNU PNU PNU PNU
6.60 0.295 7.49 P P P
7.35 7.45 0.336 8.53 PU PU PU
2 7/8 2.875 73.02 6.40 6.50 0.217 5.51 PNU PNU
7.80 7.90 0.276 7.01
8.60 8.70 0.308 7.82 PLB PLB PLBE PLB
9.35 9.45 0.340 8.64 PLB PLB PLBE PLB
10.50 0.392 9.96 PLB PLB PLB PLB
11.50 0.440 11.18 PLB
3 1/2 3.5 88.9 7.70 0.216 5.49 PN PN PN PN PN PN
9.20 9.30 0.254 6.45 PNU PNU PNU PNU PNU PNU PNU
10.20 0.289 7.34 PN PN PN PN PN PN
12.70 12.95 0.375 9.52 PNU PNU PNU PNU PNU
14.30 0.430 10.92 P P P
15.50 0.476 12.09 P P P
17.00 0.530 13.46 P P P
4 4 101.6 9.50 0.226 5.74 PN PN PN PN PN PN
11.00 0.262 6.65 PU PU PU PU PU PU
13.20 0.330 8.38 P P P
16.10 0.415 10.54 P P P
18.90 0.500 12.70 P P P
22.20 0.610 15.49 P P P
4 1/2 4.5 114.3 12.60 12.75 0.271 6.88 PNU PNU PNU PNU PNU PNU
15.20 0.337 8.56 P P P
17.00 0.380 9.65 P P P
18.90 0.430 10.92 P P P PLB
21.50 0.500 12.70 P P P PLB
23.70 0.560 14.22 P P P PLB
26.10 0.630 16.00 P P P PLB
P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral
- Specification & Size of Casing Slotted Liner
DN O.D. Weight W.T. End Machining Form
Steel Grade
Inch mm lb/ft kg/m Inch mm H40 J55 L80 N80 C90 P110
K55 T95
4 1/2 4.5 114.3 9.50 14.14 0.205 5.21 PS PS
10.50 15.63 0.224 5.69 PSB
11.60 17.26 0.250 6.35 PSLB PLB PLB PLB PLB
13.50 20.09 0.290 7.37 PLB PLB PLB PLB
15.10 22.47 0.337 9.56 PLB
5 5 127 11.50 17.11 0.220 5.59 PS
13.00 19.35 0.253 6.43 PSLB
15.00 22.32 0.296 7.52 PSLB PLB PLB PLBE PLB
18.00 26.79 0.362 9.19 PLB PLB PLBE PLB
21.40 31.85 0.437 11.10 PLB PLB PLB PLB
23.20 34.53 0.478 12.14 PLB
24.10 35.86 0.500 12.70 PLB
5 1/2 5.5 139.7 14.00 20.83 0.244 6.20 PS PS
15.50 23.07 0.275 6.98 PSLB
17.00 25.30 0.304 7.72 PSLB PLB PLB PLBE PLB
20.00 29.76 0.361 9.17 PLB PLB PLBE PLB
23.00 34.23 0.415 10.54 PLB PLB PLBE PLB
26.80 39.88 0.500 12.70
29.70 44.20 0.562 14.27
32.60 48.51 0.625 15.88
35.30 52.53 0.687 17.45
38.00 56.55 0.750 19.05
40.50 60.27 0.812 20.62
43.10 64.14 0.875 22.22
6 5/8 6.625 168.28 20.00 29.76 0.288 7.32 PS PSLB
24.00 35.72 0.352 8.94 PSLB PLB PLB PLBE PLB
28.00 41.67 0.417 10.59 PLB PLB PLBE PLB
32.00 47.62 0.475 12.06 PLB PLB PLBE PLB
7 7 177.8 17.00 25.30 0.231 5.87 PS
20.00 29.76 0.272 6.91 PS PS
23.00 34.23 0.317 8.05 PSLB PLB PLB PLBE
26.00 38.69 0.362 9.19 PSLB PLB PLB PLBE PLB
29.00 43.16 0.408 10.36 PLB PLB PLBE PLB
32.00 47.62 0.453 11.51 PLB PLB PLBE PLB
35.00 52.09 0.498 12.65 PLB PLB PLBE PLB
38.00 56.55 0.540 13.72 PLB PLB PLBE PLB
42.70 63.54 0.625 15.88
46.40 69.05 0.687 17.45
50.10 74.56 0.750 19.05
53.60 79.77 0.812 20.62
57.10 84.97 0.875 22.22
7 5/8 7.625 193.68 24.00 35.72 0.300 7.62 PS
26.40 39.29 0.328 8.33 PSLB PLB PLB PLBE PLB
29.70 44.20 0.375 9.52 PLB PLB PLBE PLB
33.70 50.15 0.430 10.92 PLB PLB PLBE PLB
39.00 58.05 0.500 12.70 PLB PLB PLBE PLB
42.80 63.69 0.562 14.27 PLB PLB PLB PLB
45.30 67.41 0.595 15.11 PLB PLB PLB PLB
47.10 70.09 0.625 15.88 PLB PLB PLB PLB
51.20 76.19 0.687 17.45
55.30 80.30 0.750 19.05
8 5/8 8.625 219.08 24.00 35.72 0.264 6.71 PS
28.00 41.62 0.304 7.72 PS
32.00 47.62 0.352 8.94 PS PSLB
36.00 53.57 0.400 10.16 PSLB PLB PLB PLBE PLB
40.00 59.53 0.450 11.43 PLB PLB PLBE PLB
44.00 65.48 0.500 12.70 PLB PLB PLBE PLB
49.00 72.92 0.557 14.15 PLB PLB PLBE PLB
9 5/8 9.625 244.48 32.30 48.07 0.312 7.92 PS
36.00 53.57 0.352 8.94 PS PSLB
40.00 59.53 0.395 10.03 PSLB PLB PLB PLBE
43.50 64.73 0.435 11.05 PLB PLB PLBE PLB
47.00 69.94 0.472 11.99 PLB PLB PLBE PLB
53.50 79.62 0.545 13.84 PLB PLB PLBE PLB
58.40 86.91 0.595 15.11 PLB PLB PLB PLB
59.40 88.40 0.609 15.47
64.90 96.58 0.672 17.07
70.30 104.62 0.734 18.64
75.60 112.50 0.797 20.24
10 3/4 10.75 273.05 32.75 48.74 0.279 7.09 PS
40.50 60.27 0.350 8.89 PS PSB
15.50 67.71 0.400 10.16 PSB
51.00 75.90 0.450 11.43 PSB PSB PSB PSBE PSB
55.50 82.59 0.495 12.57 PSB PSB PSBE PSB
60.70 90.33 0.545 13.84 PSBE PSB
65.70 97.77 0.595 15.11 PSB PSB
73.20 108.93 0.672 17.07
79.20 117.86 0.734 18.64
85.30 126.94 0.797 20.24
11 3/4 11.75 42.00 62.50 0.333 8.46 PS
47.00 69.94 0.375 20.24
54.00 80.36 0.435 8.46
60.00 89.29 0.489 9.53
65.00 96.73 0.534 11.05
71.00 105.66 0.582 14.42
13 3/8 13.375 339.73 48.00 71.43 0.330 8.38 PS
54.50 81.10 0.380 9.65 PSB
61.00 90.78 0.430 10.92 PSB
68.00 101.19 0.480 12.19 PSB PSB PSB PSB PSB
72.00 107.15 0.514 13.06 PSB PSB PSB PSB
16 16 406.4 65.00 96.73 0.375 9.53 PS
75.00 111.61 0.438 11.13 PSB
84.00 125.01 0.495 12.57 PSB
109.00 162.21 0.656 16.66 P P P P
18 5/8 18.625 473.08 87.50 130.21 0.435 11.05 PS PSB
20 20 508 94.00 139.89 0.438 11.13 PSL PSLB
106.50 158.49 0.500 12.70 PSLB
133.00 197.93 0.635 16.13 PSLB
P——Plain;S——Short-thread;L——Long-thread;B——Buttress thread;E——Extreme thread
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