The metallurgical marrow of the slot wedge water well screen pulses with austenitic stainless steels, chiefly AISI 304 and 316L, whose atomic lattices are alloyed to parry the geochemical furies of subterranean brines and humic leachates. Type 304, alloyed to 18 wt% chromium and 8% nickel, erects a Cr₂O₃ passivation bastion—nanometric yet omnipotent—that quells anodic dissolution in oxygenated aquifers (Eh >200 mV), corrosion kinetics plummeting to 0.001 mm/year under ASTM G31 immersion, a tenth that of galvanized kin. Yield strength anchors at 205 MPa annealed, surging to 515 MPa ultimate tensile with 40% elongation, per A240 shear tests, endowing the 2.3 × 3.5 mm profile wires with flexural moduli exceeding 190 GPa to counter buckling under 100 m eccentric loads. Carbon sequestration below 0.08 wt% forestalls sensitization during 1200 A welds, intergranular fissures nil as per A262 oxalic etch.For sulfidic or chloridated deeps—where Cl⁻ concentrations crest 5000 mg/L—316L interposes 2-3% molybdenum, elevating PREN to 24 and pitting potentials to 650 mV_SCE in 3.5% NaCl sweeps, molybdenum’s d-electrons stabilizing the oxide against aggressive anion adsorption. Yield dips modestly to 170 MPa for low-carbon (<0.03%) temper, yet hardness climbs to 180 HB, abrasion resistance quadrupling against quartz-laden inflows (Mohs 7). Duplex intermetallics like 2205, with 22% Cr, 3% Mo, and 0.16% N interstitials, vault yields to 450 MPa and PRENs to 35, their biphasic microstructure—50:50 austenite-ferrite—thwarting chloride stress corrosion cracking (CSCC) via phase boundary diffusion barriers, fatigue limits enduring 300 MPa at 10^7 cycles per E466. Hastelloy C-276 variants, for geothermal extremes (>150°C), alloy 15% Mo and 16% Cr for PREN >45, corrosion negligible even in H₂S-saturated vents.Electrochemical impedance arcs (>10^6 Ω cm² at 10 mHz) chronicle the passive film’s capacitive bulwark, self-healing via O₂ ingress post-abrasion. Galvanic hazards with carbon steel couplers—demanding PTFE isolators—spike dissolution 10-fold sans mitigation, Pourbaix terrains dictating pairings. Thus, material alchemy is geochemical cartography, plotting alloy domains against pH-Eh contours to sculpt screens that not only endure but evolve, their lattices a defiant rejoinder to aqueous entropy.
|
Grade
|
Composition (wt%)
|
Yield (MPa)
|
Tensile (MPa)
|
Elongation (%)
|
PREN
|
Corrosion Rate (mm/yr, brackish)
|
|---|---|---|---|---|---|---|
|
304
|
Cr:18, Ni:8, C:≤0.08
|
205
|
515
|
40
|
19
|
0.005
|
|
316L
|
Cr:16-18, Ni:10-14, Mo:2-3, C:≤0.03
|
170
|
485
|
40
|
24
|
0.001
|
|
2205 Duplex
|
Cr:22, Ni:5, Mo:3, N:0.16
|
450
|
650
|
25
|
35
|
<0.0005
|
|
Hastelloy C-276
|
Cr:16, Mo:15, W:4, C:≤0.01
|
345
|
690
|
40
|
45
|
<0.0001
|
These quanta, ASTM-vetted, herald 316L’s dominion in 70% of deep bores, where pitting indices <0.1 sustain 50-year tenures.
Geometric erudition governs the slot wedge water well screen’s form, a helical tapestry of profile wires (2.3-3.2 mm wide, 3.5-6.0 mm high) entwined at 5-10° pitches around triangular or round supports (2.3 × 2.7 to 3.7 × 5.6 mm), yielding slots of 0.1-3.0 mm precision (±0.02 mm via electrofusion). Diameters cascade from 89 mm (3-1/2″) for slim reconnaissance bores to 1200 mm (48″) for municipal intakes, lengths telescoping 2.9-5.8 m sans seams, minimizing turbulence per Navier-Stokes eddies. Open area fractions, 30-45%, eclipse perforated casings’ 15%, flux densities <1 m/min curbing Bernoulli headlosses h_f = f (L/D) (V²/2g) to <0.2 m at 200 m³/h. Ends—threaded NPT or baffle rings—bear 5000 ft-lbs makeup, centralizers averting wall contacts in deviated trajectories >30°.Customization per geological sieve curves tailors slots to D_10 formations (e.g., 0.63 mm for uniform sands), Kozeny-Carman permeabilities k = (ε³ d²)/[180(1-ε)²] optimized for ε=0.38 packs. FOTI (flow-out-to-in) orientation repels fines via diverging hydraulics, slot apertures widening 20% internally to invoke lift coefficients >0.5 on 0.75 mm grains. Fabrication deploys automated winders at 2 m/min, 1000 A resistance fusing 200 joints/m, ultrasonic NDT confirming >99% integrity per ASME V.Canonical dimensions, as codified in industry compendia:
|
Size (inch)
|
O.D. (mm)
|
Slot (mm)
|
Length (m)
|
Profile Wire (mm)
|
Support Rods (mm)
|
|---|---|---|---|---|---|
|
3-1/2
|
88.9
|
1.0
|
2.9
|
2.3 × 3.5
|
3.8 / 22
|
|
4-1/2
|
114.3
|
1.0
|
2.9
|
2.3 × 3.5
|
3.8 / 22
|
|
6-5/8
|
168.3
|
0.75
|
5.8
|
2.3 × 3.5
|
3.8 / 32
|
|
6-5/8
|
168.3
|
1.0
|
5.8
|
2.3 × 3.5
|
3.8 / 32
|
|
6-5/8
|
168.3
|
0.63
|
5.8
|
3.2 × 6.0
|
6.0 × 32
|
|
8-5/8
|
219.1
|
1.0
|
5.8
|
2.3 × 3.5
|
3.8 / 48
|
|
8-5/8
|
219.1
|
1.0
|
5.8
|
3.0 × 5.0
|
4.0 / 48
|
|
8-5/8
|
219.1
|
1.0
|
5.8
|
3.2 × 6.0
|
5.0 / 48
|
|
10-3/4
|
273.1
|
0.75
|
5.8
|
2.3 × 3.5
|
4.9 / 55
|
These archetypes, scalable to 40″ OD, predicate FEA-verified uniformities, stress contours <100 MPa at 50 bar differentials.
In sum, geometry is lithic lexicon, its curvatures scripting subterranean conduits with unerring eloquence.
Mechanical mettle armors the slot wedge water well screen against the geostatic maelstroms of deep emplacement, where lithostatic gradients impose 60 bar confinements and suspension strings tally 20 tons over 1000 m. Collapse resistances, paramount for unconsolidated overburdens, span 22-83 bars for 3-1/2″ to 8-5/8″ gauges, Lame’s radial equilibria σ_θ = P (r_o² + r_i²)/(r_o² – r_i²) augmented by rod-wire synergies bearing 70% hoop via Eulerian arches, safety factors >2.5 per API 5C5 hydrostatics.
Tensile column loads crest 46 tons for 6 m spans, yield thresholds 250 MPa for 304 wires per A370, elongations <0.5% forestalling necking in free-fall descents.Torsional rigors from kelly-driven makeup (3000 ft-lbs) persist 10^6 revolutions, S-N asymptotes at 200 MPa for 316L, fillet radii 0.3 mm capping K_t=1.4 per Peterson charts. Fatigue from 24/7 yields (50 Hz pulsations) endures 10^8 cycles at 150 MPa amplitude, Charpy impacts >140 J at 0°C blunting fractures in permafrost bores. Hardness profiles 200-250 HB resist proppant scour, thermal conductivities 16 W/m·K tolerating 120°C gradients sans creep, α=17×10^{-6}/K matching epoxy centralizers.Indicative mechanical mosaic:
|
Size (inch)
|
Collapse (bar)
|
Tensile (ton)
|
Yield Wire (MPa)
|
Fatigue Limit (MPa)
|
Hardness (HB)
|
|---|---|---|---|---|---|
|
3-1/2
|
>22
|
10.2
|
250
|
180
|
200
|
|
4-1/2
|
>28
|
11.5
|
250
|
180
|
200
|
|
6-5/8 (0.75mm)
|
>40
|
12.8
|
250
|
200
|
220
|
|
6-5/8 (0.63mm)
|
>83
|
45
|
300
|
250
|
250
|
|
8-5/8
|
>34-60
|
21.9-46
|
250-300
|
200-250
|
220-250
|
|
10-3/4
|
>50
|
32.9
|
250
|
200
|
220
|
These vigors, surge-chamber ratified, outpace slotted PVC 5:1 in saline deeps, where CSCC-fatigue erodes alternatives 40% swifter.
Corrosion-mechanical pas de deux: cathodic polarizations (+15% yield via H occlusion) versus anodic pitting (-20% endurance); thus, mechanics prophesy resilience in the abyss’s anvil.
Performance panache of the slot wedge water well screen manifests in its hydraulic hegemony, continuous slots channeling Forchheimer fluxes ∇P = (μ/k) V + β ρ V² with k >10^{-3} m² for 1 mm apertures, throughputs 150-500 m³/h at ΔP <0.5 bar for 168 mm OD. Open areas 35-50% halve velocities to 0.2 m/s, Re <5000 laminar biases curbing encrustation rates <0.1 mm/yr in calcareous flows, DLVO disjunctions unseating 0.5 mm bridges >95% efficaciously.
Backwash regenerations—20 m/min airlifts—restore 98% permeability sans disassembly, NTU turbidities <5 post-cycle per NE 1275.In deep yields, Muni-Pak pre-packs (0.3-1.26 mm slots) amplify capacities 20%, ceramic beads ε=0.38 homogenizing Darcy’s J = -k i, i hydraulic gradient. Versus bridge-slotted: 1.5x open area quells surging losses 30%, lifecycle specifics 75 m³/d/m drawdown in fractured volcanics. Energy frugality: 0.3 kWh/m³ pumping, 25% below casings. Thus, performance is aqueous aria, distilling profundity into potability.
Features cascade: self-cleansing V-profiles thwart 80% plugging, robust rods confer >60 bar bursts, corrosion bastions extend MTBF >30 years. Low-maintenance: quarterly surging suffices, custom slots (0.1 mm min) tailor to USGS grain analyses. Versus perforated: 3x flow sans burrs, woven: no delamination, costs 15% par with 4x span. In oil co-production, dual-media packs yield <10 NTU brines at 300 m³/h.
The water well screen is an important component of a well that allows water to flow into the well while preventing sediment and other debris from entering. The screen is typically located at the bottom of the well, near the aquifer. This is done to ensure that only clean water is collected and that any sediment or dirt is filtered out. The screen is typically made from a perforated pipe or other type of material that has small openings to allow water to pass through while blocking sediments from entering. Abter well screen is manufactured with a continuous v-shaped slot to reduce the entrance velocity of water and encrustation rates. Besides, Filson well screen has a large surface area without clogging, thus provide superior filtration performance. Well screen slot size selection is a critical step, typically based on the particle size analysis of the formation sample. With the standard slot size range from 0.005” to 0.5”, Filson well screen can control sand particles and silt from the well perfectly. Advantages of Water Well Screens 1. The V-shape section plane of water well screens creates the continuous slot, which can avoid blockage and make sure of the unimpeded water. Read more
PARAMETER Geothermal Pipe based well screen specification: Nominal Diameter Pipe OD(mm) Weight lb/ftW.T[mm] Hole size In Holes per foot Total Areaofholes in2/ft Screen OD (in) 2-3/8 60 4.6[4.83] 3/8 96 10.60 2.86 2-7/8 73 6.4[5.51] 3/8 108 11.93 3.38 3-1/2 88.9 9.2[6.45] 1/2 108 21.21 4.06 4 101.6 9.5[5.74] 1/2 120 23.56 4.55 4-1/2 114.3 11.6[6.35] 1/2 144 28.27 5.08 5 127 13[6.43] 1/2 156 30.63 5.62 5-1/2 139.7 15.5[6.99] 1/2 168 32.99 6.08 6-5/8 168.3 24[8.94] 1/2 180 35.34 7.12 7 177.8 23[8.05] 5/8 136 42.16 7.58 7-5/8 194 26.4[8.33] 5/8 148 45.88 8.20 8-5/8 219 32[8.94] 5/8 168 51.08 9.24 9-5/8 244.5 36[8.94] 5/8 188 58.28 10.18 10-3/4 273 45.5[10.16] 5/8 209 64.79 11.36 13-3/8 339.7 54.5[9.65] 5/8 260 80.60 14.04 What is Geothermal Well Screen？ Geothermal well screens are an essential component of a geothermal well system. They are used to filter and protect the geothermal well from debris and other contaminants that can be harmful to the system. Sand Control Screens are designed to be durable and reliable, providing long-term protection for the well. The geothermal well screen is a cylindrical tube made of a perforated metal or plastic material. The perforations are designed to allow Read more
Pre Packed Sand Screen contains perforated base pipe, inner and outer screen jackets and graded sand between the jackets. It is a modification of wire wrapped screen which is used in well sorted sand or stand-alone completion. Graded sand, with or without resin coating, is considered as a filter for reservoir particles. Wire wrapped pre Pre Packed Sand Screen is used in wells where conventional gravel packing is not feasible or economical. The thickness of gravel layer can be varied to meet special requirement. What Is the Function of Gravel Pack? Gravel packing is one of popular sand-control technique used in oil, water and gas wells. It stabilizes the borehole and filters the sand from the flow, only allowing very fine particles in. Pre Packed Sand Screen wire wrapped sand screen brings it into full play in maximizing production as well as controlling the sand. Diameter: 168mm Material: stainless steel,carbon steel,etc Slot: 0.2mm End Connection: thread,coupling,etc thickness: 10mm Pre Packed Sand Screen PRODUCT SPECIFICATIONS Base Pipe Gravel Pack Perforations Screen OD (in.) ID (in.) Weight (lbs.) Coupling OD (in.) Thickness (in.) Size (in.) Holes/ft. OD (in.) Cylinder Area (sq. in./ft) 006 GA Inlet Area (sq. in./ft) 1.9 1.61 2.75 Read more
1. Grade: SUS 304 SUS304L, SUS316, SUS316L, or carbon steel 2. Slot Size: 0.02mm~15mm 3. Standard: DIN AISI ASTM 4. Certification: ISO9001, API 5CT 5.Pipe based well screens consist of base pipe,all-welded wedge wire screen and supporting rod.The base pipe is perforated or slotted API casing pipe,the base pipe can be stainless steel or carbon steel API 5CT casing.The all-welded wedge wire screens are welded together with base pipe by supporting rod. 6.Features of Pipe Based Well Screens: 1)Higher filtering accuracy: all-welded wedge wire screens as screen jacket with vee opening design makes the filtering accuracy higher,which can control sand better. 2)Excellent strength and resistance to deformation: The base pipe inside,the outside can be protected with the protection jacket added according to requirements,the integrated strength of the perforated base pipe only decreases 2~3% compared with the standard casing/oil tubing,so the pipe based well screens have enough integrated strength to resist to the pressure caused by strata.Even if some part of the well screens deformed,the slot of this part will not be widened,which makes higher sand controlreliability 3)More choices: the material of screen jacket can be stainless steel or carbon steel,the material can be chosen as per customers'requirement. 4)The smaller slot Read more
1. Introduction of Slotted Casing Pipe Casing pipe is a large-diameter pipe that serves as the structural retainer for the walls of oil and gas wells, or well bore. It is inserted into a well bore and cemented in place to protect both subsurface formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take place. Slotted casing pipe is a type of casing pipe that has slots machined into its surface. These slots are used to help control the flow of water, oil, and gas in a well bore. The slotted casing pipe is designed to allow water, oil, and gas to flow through the slots while preventing sand and other debris from entering the well bore. Slotted casing pipe is commonly used in oil and gas wells, water wells, and geothermal wells. 2. Types of Slotted Casing Pipe There are two main types of slotted casing pipe: open slot and perforated slot. Open slot casing pipe has slots that are cut into the surface of the pipe in a straight line. These slots are usually spaced evenly apart and are typically about 1/4 inch wide and 1/4 inch deep. Perforated slot Read more
Applications of Perforated Pipe: Perforated well screen is a type of filter used in oil and gas wells. It is designed to control the flow of oil and gas from the well, while preventing sand and other debris from entering the well. perforation in the context of oil wells refers to a hole punched in the casing or liner of an oil well to connect it to the reservoir. Creating a channel between the pay zone and the wellbore to cause oil and gas to flow to the wellbore easily. In cased hole completions, the well will be drilled down past the section of the formation desired for production and will have casing or a liner run in separating the formation from the well bore. The final stage of the completion will involve running in perforating guns, a string of shaped charges, down to the desired depth and firing them to perforate the casing or liner. A typical perforating gun can carry many dozens of explosive charges. Commonly, perforation guns are run on E-line as it is traditional to use electrical signals from the surface to fire the guns. In more highly deviated wells, coiled tubingmay be used. Newer technologies Read more
