Specifications

Maximum flow capacity
Lowest operation cost
Maximum life for water or oil well
Collapse strength similar to casing pipe

Pipe based Johnson water well screen

 

Pipe based screens are used in water wells in many parts of the world and are common in oil field work because of their strength and durability in non-vertical borehole applications. the assembly for this screen is made by perforating a base peple and then mounting a continuous slot screen over it via one of three methods: 1) winding trapezoid-shaped wire directly onto a pipe(wrap-on pipe); 2) winding wire over longitudinal rods mounted around a pipe's circumference(pipe base); or 3) slipping a separate continuous slot well screen jacket over a pipe(screen jacket). winding wire over longitudinal rods is superior to the wrap-on pipe design because the rods hold the wire away from the pipe surface, blocking fewer of the base-pipe openings.

The pipe based screen has two sets of openings, the outer continuous slot and the holes drilled in the pipe base. The open area of the pipe base generally is less than that of the outer screen open area, and the inner pipe has a maximum open area of 10%. Hydraulic performance of the assembly depends on the open area in the pipe base, which usually is made of steel and has an outer screen made of stainless steel. This bimetal contact typically supports some electrolytic action and causes corrosion of the steel pipe. One way to prevent corrosion is to use pipe and screen made of the same metal- the cost might be somewhat higher, but the product is more durable.

 

• High flow capacity. The jacket is made of rod based  continuous slot well screen, this allow more water or oil to enter at much lesser frictional head loss and the efficiency of well is improved appreciably.
• Perfect integral strength and strong anti-deformation ability
  The internal part of filtration jacket is supported by base pipe and the outer protective shroud can be fixed outside the filtration jacket if necessary. The integral strength of base pipe with drilled holes is merely 2~3% less than standard casing or tubing. So it can withstand compression deformation from stratum with sufficient integral strength. Even if local deformation occurs, the gap of compressed part will not be enlarged. It has been proved to be highly reliable on sand control.
• More choice: The screen jacket material can be stainless steel or low carbon steel,it is can as per your requirement
• Slot with high density, low flow resistance .Slot density are 3~5 times as traditional slotted screen, with low flow resistance. It is conducive to increase production of oil or gas.
• Good manufacturability makes high efficiency, low cost, and large-scale production achievable.

  Technical parameters

 

BASE PIPE						SLIP ON SCREEN JACKET
Nominal Diameter	Pipe OD (mm)	Weight lb/ft W.T [mm]	Hole size In	Holes per foot	Total Area of holes in2/ft	Screen OD (in)	Open area of screen in2/ft SLOT
							0.008”	0.012”	0.015”	0.020”
2-3/8	60	4.6[4.83]	3/8	96	10.60	2.86	12.68	17.96	21.56	26.95
2-7/8	73	6.4[5.51]	3/8	108	11.93	3.38	14.99	21.23	25.48	31.85
3-1/2	88.9	9.2[6.45]	1/2	108	21.21	4.06	18.00	25.50	30.61	38.26
4	101.6	9.5[5.74]	1/2	120	23.56	4.55	20.18	28.58	34.30	42.88
4-1/2	114.3	11.6[6.35]	1/2	144	28.27	5.08	15.63	22.53	27.35	34.82
5	127	13[6.43]	1/2	156	30.63	5.62	17.29	24.92	30.26	38.52
5-1/2	139.7	15.5[6.99]	1/2	168	32.99	6.08	18.71	26.96	32.74	41.67
6-5/8	168.3	24[8.94]	1/2	180	35.34	7.12	21.91	31.57	38.34	48.80
7	177.8	23[8.05]	5/8	136	42.16	7.58	23.32	33.61	40.82	51.95
7-5/8	194	26.4[8.33]	5/8	148	45.88	8.20	25.23	36.36	44.16	56.20
8-5/8	219	32[8.94]	5/8	168	51.08	9.24	28.43	40.98	49.76	63.33
9-5/8	244.5	36[8.94]	5/8	188	58.28	10.18	31.32	45.15	54.82	69.77
10-3/4	273	45.5[10.16]	5/8	209	64.79	11.36	34.95	50.38	61.18	77.86
13-3/8	339.7	54.5[9.65]	5/8	260	80.60	14.04	37.80	54.93	66.87	85.17