Slotted Liner

shows-a-pic-of-slotted-liner

Slotted Liner

A slotted liner is a steel pipe with screen slots cut into the pipe wall. The slots are cut along the length of the pipe, and they typically range in width from 0.020 to 0.250 inches. Slotted liners are manufactured to API 5CT specifications, and they are used in a variety of applications including oil and gas production, water injection, and geothermal wells. One of the key advantages of a slotted liner is that it can provide enhanced performance in high-sand content environments. The slots allow for increased communication between the wellbore and the formation, which can significantly improve hydrocarbon recovery rates. In addition, slotted liners can also be used to achieve zonal isolation in multi-zone completions. By properly selecting the slot size and spacing, it is possible to create a barrier between zones that will prevent fluid mixing and improve production efficiency.

Why choose tuspipe?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Slot Size of Slotted Liner

The slot size of the slotted liner, which includes the width and length of the slot, is customized to the customer’s specifications. 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 of Slotted Liner

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.

shows the slotting pattern of Staggered-Slotted-Liner

Staggered Slotted Liner

Staggered slots are evenly distributed around the circumference with an offset.

shows the slotting pattern of Gang Slotted Liner

Gang Slotted Liner

Gang slots are made up of many slots that are dispersed around the perimeter.

shows the slotting pattern of Straight Slotted Liner

Straight Slotted Liner

Straight slotted liner features slot columns spaced evenly around the circumference without offset.

Slot Types of Slotted Liner

TUSPIPE can laser-cut slots to customer specifications, either straight or keystone.

- 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.

shows the cut slot of Straight Slots
shows the cut slot of Keystone Slots

Slot density

The slot density of a pipe is defined as the number of slots per foot of pipe. It is determined by the pipe’s outer surface’s open area. The open region of a slotted liner has a significant role in diminishing its sand control capacity. In general, open land is between 2% and 4% of the total area.

After determining the open area, slot width, and liner diameter, the slot density per foot can be estimated using the following formula:

N = (12*π*D*C) / (100*W*L)

N stands for slot density or the number of slots per foot
D stands for the outside diameter of the liner in inch
C stands for open area, percentage
W stands for slot width in inch
L stand for the length of the slot in inch

For example, if the open area of a 4.5″ slotted liner is 3%, the slot width is 0.02 inches, and the slot length is 1.5′, what is the slot count per foot?

The required number of slots is shown below using the calculation above:

N = (12*π *4.5*3) / (100*0.020*1.5) = 172

Note: This is a straightforward calculation for a straight slot or a seamed keystone slot.

Dimensions and Sizes of Slotted Liner

- 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

Features of Slotted Liner

A slotted liner is a steel pipe with continuous, precision-cut slots along its entire length. The slots are cut using a high-pressure water jet and can be oriented horizontally or vertically. Slotted liner is manufactured in compliance with API 5CT standards and is available in a range of sizes, from 2-3/8″ to 4-1/2″. The number and size of the slots can be customized based on the application, but they are typically between 0.020″ and 0.250″ wide. The thickness of the steel pipe ranges from 3.18 mm to 16 mm.

The slotted liner has a number of features that make it an attractive choice for well-completion and sand control applications. The slots allow for improved flow performance and increased sand retention, while the steel pipe offers high resistance to corrosive fluids. Additionally, a slotted liner can be run on coiled tubing or jointed pipe, making it a versatile option for a variety of operations. A slotted liner can also be easily removed and replaced if necessary. When selecting a slotted liner for your operation, it is important to consider the desired flow rate, fluid properties, production profile, and allowable pressure drop. With proper selection and installation, a slotted liner can provide many years of reliable performance.

Applications of Slotted Liner

Slotted liners are well screens with perforations or slots that allow the passage of fluid while preventing the passage of sand and other particulates. They are used in a variety of applications, including well completion, well rehabilitation, and sand control. Slotted liners can be made of steel, stainless steel, aluminum, or plastic, and are available in a variety of sizes and slot configurations. In well completion, slotted liners are used to provide a path for fluid flow and to prevent the wellbore from collapsing. In well rehabilitation, slotted liners can be used to increase production by creating new wellbores or by restoring damaged wellbores. And in sand control, slotted liners are used to prevent the production of sand from wells. Slotted liners are an important tool for oil and gas production, and their applications are continuing to expand.

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