J55|N80 Slotted Liner

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Product  Descriptions :J55|N80 Slotted Liner

Slotted liners are used in gravel packed completions to prevent the production of gravel pack sand or can be used in stand-alone service when the formation grain size is large. Slot widths are often referred to in terms of "gage" or "gauge". Slot or screen gage is simply the width of the opening in inches multiplied by a 1,000. For instance, a 12 gage screen has openings of 0.012 inches. Slotted liners are manufactured by machining slot openings through oil-field tubulars with small rotary saws. Slotted liners are fabricated in a variety of patterns as illustrated in Figure.

The minimum slot widths that can be achieved is about 0.012 inches; however, slots widths cut below 0.030 inches in thickness involve higher costs because of excessive machine down time to replace broken saw blades that become overheated, warped and break. While the slotted liners are usually less costly than wire-wrapped screens, they have a smaller inflow area and experience higher pressure drops during production.

Slotted liners also plug more readily than screens and are used where well productivity is low and economics cannot support the use of screens. The single slot staggered pattern is generally preferred because a greater portion of the original strength of the pipe is preserved. The staggered pattern also gives a more uniform distribution of slots over the surface area of the pipe. The single slot staggered pattern is slotted with an even number of rows around the pipe with a typical 6 inch longitudinal spacing of slot rows.

SLOTTED LINER GEOMETRIES

The slots can be straight or keystone shaped as illustrated in Figure. The keystone slot is narrower on the outside surface of the pipe than on the inside. Slots formed in this way have an inverted "V" cross-sectional area and are less prone to plugging since any particle passing through the slot at the OD of the pipe will continue to flow through rather than lodging within the slot.

STRAIGHT AND KEYSTONE SHAPED SLOTS

The length of the individual slots is gauged on the ID of the pipe. Usual practice dictates 1½ inch long slots for slot widths 0.030" and under, 2 inch long slots for slot widths between 0.030 to 0.060 inches and 2½ inch long slots for slot widths 0.060 inches and larger (see Figure 6.4). Slot width tolerance is generally 0.003 inches for widths 0.040 inches and wider and 0.002 inches for widths less than 0.040 inches.

STANDARD SLOT LENGTHS

Slotted liners are generally designed to have a 3 percent open area relative to the OD surface area of the pipe although open areas up to 6 percent are feasible in some cases. The number of slots per foot required to achieve a given open area is calculated with the equation below.

where: N = required slots/foot (if N < 32, round up to the nearest multiple of four, if N > 32, round up to the nearest multiple of 8) Pie = constant (3.1416) D = outer diameter of pipe (inches) C = required open area (percent) W = slot width (inches) L = length of slot measured on ID of pipe (inches)


Dalipal Company is one of the most famous enterprises of china professionally producing pipeline and oil casing.We can supply API 5CT series of pipeline and oil casing with all kinds of specifications and materials.We have first-class production equipment and technology.

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Q:What does "spiral welded steel pipe" DN325*10 mean?
Labeling is wrong: it should be said for 325*10, the diameter of pipe wall thickness of 10, 325;For example, the nominal diameter shall be: DN300.
Q:Heating system DN40 and DN32 welded steel pipe how to connect?
As for the flange connection: low pressure pipeline is generally not used in this way, can be divided into threaded flanges and flange welding flange, and the flange connecting pipes of different diameters, only the welded flange to diameter, said in a low pressure pipeline which has low pressure pipe connection make an unnecessary move, this is not much, but there are also people with non the standard flange for connecting different pipe diameter, which is not consistent with the technical specification!
Q:Is there any difference between HFW steel pipe and ERW steel pipe?
ERW steel is high frequency ERW pipe, English Electric Resistance Welding, referred to as the abbreviation of machined steel in diameter and wall thickness of the pipe size range, with greater flexibility, especially in production
Q:What are the uses of welded steel pipes?
Low pressure fluid conveying galvanized steel tube (GB/T3091-1993) is also called galvanized pipe, commonly known as white tube. It is used for hot water, gas, air, oil, heating, steam, warm water and other generally low pressure fluid or other hot dip galvanizing (furnace welding or welding) steel pipe. The wall thickness of the steel pipe is divided into ordinary galvanized steel pipe and thick galvanized steel pipe. The end of the pipe is divided into non - threaded galvanized steel pipe and threaded galvanized steel pipe. The specification of steel pipe is expressed by nominal caliber (mm). The nominal diameter is the approximate value of the inner diameter. Usually used in inches, such as 11/2.
Q:Are metal spiral tubes the same as metal bellows?
Hello. The two are not the same. The difference lies in. The pitch of a spiral pipe is much larger than that of a bellows. The maximum material thickness of the spiral tube is much thicker than that of the bellow. The diameter of a spiral tube can be very large. But the bellows can't be too big in diameter.
Q:How big is the seamless steel tube of DN50?
DN refers to the nominal diameter, the outer diameter is 60.3mm
Q:What's the difference between No. 20 steel pipe and 27SiMn Steel Pipe?
Cold plastic deformation and for bending, rolling, bending and hammer arch processing, arc welding and contact welding welding performance is good, when the thickness is small, prone to strict requirement of shape crack or complex shape parts. The cold or normalizing condition of cutting is better than that of annealing. It is generally used to make the material with little force and high toughness.
Q:What does GALV mean in a steel tube?
Steel pipe is not only used to transport fluid and powder solid, exchange heat energy, and manufacture mechanical parts and containers, but also is an economic steel. It can reduce weight and save 20 to 40% of metal by using steel pipe to make building structure, network frame, prop and mechanical support. Moreover, it can realize factory mechanization construction. Using steel pipe to manufacture road bridge can not only save steel, simplify construction, but also greatly reduce the area of coating protective layer, save investment and maintenance cost.
Q:How to distinguish seamless pipe and welded pipe?
If there is a weld seam in the fracture surface, whether it is inside or outside the pipe, then it is the welded pipe
Q:What is the outer diameter and wall thickness of the welded steel pipe of national standard DN250?
DN (nominal diameter) 250 is generally the industry said 273, welded steel pipe (spiral steel pipe) thickness is generally between 6-8mm, more common.

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