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.

Product features of slotted casing:
1. Slotted casing is suitable for sand control in sand wells with a sand particle size greater than 0.3mm.
2. The edge of the slotted casing has good verticality, the cutting edge is smooth and burr-free, and the cutting seams are even.
3. The flow area is large, the 27/8" screen tube has 300 slits/1.5m, which is 2.4 times larger than the flow area of oil pipes of the same specification.
4. The overall performance stabilization treatment improves the corrosion resistance and performance of the slotted casing, which can extend its underground working life.
5. The slotted casing is made of J55 or N80 petroleum casing body, which has good strength and is not easy to deform.
6. The inner diameter of the slotted casing is large, making it easy to configure the pipe string.

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Size of Slotted casing

Slotted casing have straight and trapezoidal grooves with a minimum slot width of 0.012 inches and a maximum slot width of 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 of Slotted Casing

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 Casing
 Gang Slotted Casing
 Straight Slotted Casing
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 of Slotted Casing

- 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 of Slotted Casing

Specification & Size of Tubing Slotted casing
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 casing
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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