TUSPIPE-LOGO-TIANJIN-UNITED-STEEL-PIPE-CO.,-LTD

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 inches long

2.0 to 2.5 inches long

2.5 inches 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

DNO. D.WeightW. T.End Processing
Non-upset coupling-threadUpset coupling-threadSteel Grade
inmmlb./ft.lb./ft.inmmH40J55L80N80C90T95P110
2 3/82.3860.340.1674.24PUPNPNPNPNPN
4.64.70.194.83PNUPNUPNUPNUPNUPNUPNU
5.85.950.2546.45PNUPNUPNUPNUPNU
6.60.2957.49PPP
7.357.450.3368.53PUPUPU
2 7/82.88736.46.50.2175.51PNUPNU
7.87.90.2767.01
8.68.70.3087.82PLBPLBPLBEPLB
9.359.450.348.64PLBPLBPLBEPLB
10.50.3929.96PLBPLBPLBPLB
11.50.4411.18PLB 
3 1/23.588.97.70.2165.49PNPNPNPNPNPN
9.29.30.2546.45PNUPNUPNUPNUPNUPNUPNU
10.20.2897.34PNPNPNPNPNPN
12.712.950.3759.52PNUPNUPNUPNUPNU
14.30.4310.92PPP
15.50.47612.09PPP
170.5313.46PPP
441029.50.2265.74PNPNPNPNPNPN
110.2626.65PUPUPUPUPUPU
13.20.338.38PPP
16.10.41510.54PPP
18.90.512.7PPP
22.20.6115.49PPP
4 1/24.511412.612.750.2716.88PNUPNUPNUPNUPNUPNU
15.20.3378.56PPP
170.389.65PPP
18.90.4310.92PPPPLB
21.50.512.7PPPPLB
23.70.5614.22PPPPLB
26.10.6316PPPPLB
P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral

- Specification & Size of Casing Slotted Liner

DNO. D.WeightW. T. End Machining Form
 Steel Grade
inmmlb/ftkg/minmmH40J55L80N80C90P110
K55T95
4 1/24.500114.39.514.140.2055.21PSPS
10.515.630.2245.69PSB
11.617.260.2506.35PSLBPLBPLBPLBPLB
13.520.090.2907.37PLBPLBPLBPLB
15.122.470.3379.56PLB
55.00012711.517.110.2205.59PS
1319.350.2536.43PSLB
1522.320.2967.52PSLBPLBPLBPLBEPLB
1826.790.3629.19PLBPLBPLBEPLB
21.431.850.43711.1PLBPLBPLBPLB
23.234.530.47812.14PLB
24.135.860.50012.7PLB
5 1/25.500139.71420.830.2446.2PSPS
15.523.070.2756.98PSLB
1725.30.3047.72PSLBPLBPLBPLBEPLB
2029.760.3619.17PLBPLBPLBEPLB
2334.230.41510.54PLBPLBPLBEPLB
26.839.880.50012.7
29.744.20.56214.27
32.648.510.62515.88
35.352.530.68717.45
3856.550.75019.05
40.560.270.81220.62
43.164.140.87522.22
6 5/86.625168.282029.760.2887.32PSPSLB
2435.720.3528.94PSLBPLBPLBPLBEPLB
2841.670.41710.59PLBPLBPLBEPLB
3247.620.47512.06PLBPLBPLBEPLB
77.000177.81725.30.2315.87PS
2029.760.2726.91PSPS
2334.230.3178.05PSLBPLBPLBPLBE
2638.690.3629.19PSLBPLBPLBPLBEPLB
2943.160.40810.36PLBPLBPLBEPLB
3247.620.45311.51PLBPLBPLBEPLB
3552.090.49812.65PLBPLBPLBEPLB
3856.550.54013.72PLBPLBPLBEPLB
42.763.540.62515.88
46.469.050.68717.45
50.174.560.75019.05
53.679.770.81220.62
57.184.970.87522.22
7 5/87.625193.682435.720.3007.62PS
26.439.290.3288.33PSLBPLBPLBPLBEPLB
29.744.20.3759.52PLBPLBPLBEPLB
33.750.150.43010.92PLBPLBPLBEPLB
3958.050.50012.7PLBPLBPLBEPLB
42.863.690.56214.27PLBPLBPLBPLB
45.367.410.59515.11PLBPLBPLBPLB
47.170.090.62515.88PLBPLBPLBPLB
51.276.190.68717.45
55.380.30.75019.05
8 5/88.625219.082435.720.2646.71PS
2841.620.3047.72PS
3247.620.3528.94PSPSLB
3653.570.40010.16PSLBPLBPLBPLBEPLB
4059.530.45011.43PLBPLBPLBEPLB
4465.480.50012.7PLBPLBPLBEPLB
4972.920.55714.15PLBPLBPLBEPLB
9 5/89.625244.4832.348.070.3127.92PS
3653.570.3528.94PSPSLB
4059.530.39510.03PSLBPLBPLBPLBE
43.564.730.43511.05PLBPLBPLBEPLB
4769.940.47211.99PLBPLBPLBEPLB
53.579.620.54513.84PLBPLBPLBEPLB
58.486.910.59515.11PLBPLBPLBPLB
59.488.40.60915.47
64.996.580.67217.07
70.3104.620.73418.64
75.6112.50.79720.24
10 3/410.750273.0532.7548.740.2797.09PS
40.560.270.3508.89PSPSB
15.567.710.40010.16PSB
5175.90.45011.43PSBPSBPSBPSBEPSB
55.582.590.49512.57PSBPSBPSBEPSB
60.790.330.54513.84PSBEPSB
65.797.770.59515.11PSBPSB
73.2108.930.67217.07
79.2117.860.73418.64
85.3126.940.79720.24
11 3/411.750 4262.50.3338.46PS
4769.940.37520.24
5480.360.4358.46
6089.290.4899.53
6596.730.53411.05
71105.660.58214.42
13 3/813.375339.734871.430.3308.38PS
54.581.10.3809.65PSB
6190.780.43010.92PSB
68101.190.48012.19PSBPSBPSBPSBPSB
72107.150.51413.06PSBPSBPSBPSB
1616.000406.46596.730.3759.53PS
75111.610.43811.13PSB
84125.010.49512.57PSB
109162.210.65616.66PPPP
18 5/818.625473.0887.5130.210.43511.05PSPSB
2020.00050894139.890.43811.13PSLPSLB
106.5158.490.50012.7PSLB
133197.930.63516.13PSLB
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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