Slotted Pipe
Our Slotted Pipes are precision-engineered to serve as wall structural retainers and screen pipes for oil, gas, and water wells. Designed to prevent sand intrusion and increase well stability, these pipes significantly reduce oil well repair frequencies and production losses.
-
Application: Oil, Gas, and Water Wells sand control and structural retaining.
-
Size Range: OD: 50mm – 500mm (Casing: 4 1/2″ – 20″ | Tubing: 1.05″ – 4 1/2″).
-
Wall Thickness (WT): 5.21mm – 22.22mm (Less than 20mm standard).
-
Standards & Grades: API 5CT, BS EN ISO11960. Grades include H40, J55, K55, N80, L80 (1, 9Cr, 13Cr), C90, T95, P110, Q125.
-
Slot Types: Straight Slots, Keystone Slots.
-
Slot Patterns: Line (Straight), Single-Slot Staggered, Gang (Multiple Staggered).
-
End Connections: Plain, Beveled, Square Cut, with LTC/STC/BTC, NU, EU, XL, PH-4, PH-6.
Description
1. Product Overview & Application
Slot and perforate on the pipe body to be slotted pipes. The types of slots include Perforated, Rectangular slotted, Trapezoid slotted, Bridge slotted, Wire wrapped screen, Mechanical cutting, and Compound slotted pipe.
The slotted pipe is used extensively in oil exploration to prevent sand intrusion, decrease the frequency of oil well repairs, and increase the oil well’s strength, integrality, and stability for keeping off sand.
2. General Specifications
- O.D. (Casing): 4 1/2″ – 20″ (114.3mm – 508mm)
- O.D. (Tubing): 1.05″ – 4 1/2″ (26.7mm – 114.3mm)
- Length: R1: 4.88-7.62M, R2: 7.621-10.36M, R3: 10.36-14.63M (Generally less than 15m)
- Wall Thickness (W.T.): 0.205″ – 0.875″ (5.21mm – 22.22mm)
- Product Standards: API 5CT, BS EN ISO11960, NFM87-207, JIS G3439, ISO 4270, GOST 632-80
- Material Grades: H40, J55, K55, N80-1, N80Q, R95, L80-1, L80-9Cr, L80-13Cr, C90, T95, C110, P110, Q125
- Thread Types:
- Casing: STC, LTC, BTC, etc.
- Tubing: NU, EU, XL, PH-4, PH-6, LTC, STC, BTC, etc.
3. Slotted Types & Patterns
Slot Profiles
- (1) Straight Slots: Cut at a right angle to the liner, this slot type shows the same diameter from the inside to the outside of the wall. Although straight slots are cheaper to produce, they are less effective in sand control compared to keystone slots.
- (2) Keystone Slots: Cut at a slight angle, keystone slots, or tapered slots, are larger on the inside than on the outside, making sure that any particle entering the slot can pass through freely without clogging the slot. Keystone slots are more expensive to than straight slots, but significantly lower the risk of production losses due to plugged liner slots.
Slot Patterns
Whether you want your slotted pipe with a line, staggered, gang, overlapping, horizontal, or any other pattern, we can cut them all. Among all slot patterns, the following three are the most common:
- (3) Line (Straight) Pattern: In the line pattern, slots are placed evenly in identical bands around the pipe, forming straight lines of slots across the length of the slotted liner.
- (4) Single-Slot Staggered Pattern: In the single-slot staggered pattern, bands of evenly spaced slots are placed around the pipe. Slots in different bands are offset (staggered) to each other. The single-slot staggered pattern preserves the strength of the pipe and provides an even distribution of the slots over the area of the pipe.
- (5) Gang Pattern (Multiple Staggered Pattern): While having the same overall layout as the single-slot staggered pattern, the gang pattern places two slots, cut at close proximity, instead of just one slot at each position. Slotted pipe with a multiple staggered pattern has been shown to withstand higher torque during installation and provide better resistance to deformation under thermal load compared to the single-slot staggered pattern, making it well suited for application in steam assisted gravity drainage (SAGD) applications.
4. Detailed Specifications Table
| API Casing | ID (mm) | Length (m) | Slot Length (mm) | Slot No./m | Slot Width (mm) | Slot Tolerance | Valid Filter Area (cm/m) | Max. Strength (KN) | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Spec (mm) | Thickness (mm) | Per Weight (kg/m) | ||||||||
| 60.32 | 5 | 6.84 | 50.3 | 3 | 80 | 200 | 0.3 | ±50 | 48 | 512.54 |
| 73.02 | 5.5 | 9.15 | 62 | 240 | 57.6 | 688.55 | ||||
| 88.9 | 6.5 | 13.22 | 75.9 | 280 | 67.2 | 995.1 | ||||
| 101.6 | 6.5 | 15.22 | 88.6 | 10 | 300 | 72 | 1151.2 | |||
| 114.3 | 7 | 18.47 | 100.3 | 320 | 76.8 | 1400.4 | ||||
| 127 | 7.52 | 22.13 | 112 | 340 | 81.6 | 1673.8 | ||||
| 139.7 | 7.72 | 25.11 | 124.3 | 360 | 86.4 | 1900.2 | ||||
| 139.7 | 9.17 | 29.48 | 121.4 | 360 | 86.4 | 2232.4 | ||||
| 168.3 | 8.94 | 35.09 | 150.4 | 400 | 96 | 2672.95 | ||||
| 177.8 | 8.05 | 33.68 | 161.7 | 440 | 105.6 | 2559.2 | ||||
| 177.8 | 9.19 | 38.19 | 159.4 | 440 | 105.6 | 2940.7 | ||||
5. Mechanical Properties & Chemical Composition
API Spec 5CT / ISO 11960, GB/T 19830-2011 Specification for Casing and Tubing.
| Grade | Yield Strength Min (MPa) | Yield Strength Max (MPa) | Tensile Strength Min (MPa) | Hardness (HRC / HBW) |
|---|---|---|---|---|
| J55 | 379 | 552 | 517 | – |
| K55 | 379 | 552 | 655 | – |
| N80 (1 & Q) | 552 | 758 | 689 | – |
| L80 (1, 9Cr, 13Cr) | 552 | 655 | 655 | 23 HRC / 241 HBW |
| C90 | 621 | 689 | 689 | 25.4 HRC / 255 HBW |
| T95 | 655 | 724 | 724 | 25.4 HRC / 255 HBW |
| P110 | 758 | 862 | 862 | – |
| Q125 | 862 | 931 | 931 | – |
6. Manufacturing Process & Assurance
Our slotted pipes are processed from high-quality Seamless (SMLS) or Electric Resistance Welded (ERW) base pipes. The manufacturing incorporates precision mechanical cutting to assure clean, burr-free slots.
Assurance: We strictly follow the API/ISO quality system. Third-party inspections from SGS, DNV, BV, and Moody are highly welcomed to guarantee top-tier reliability.
7. Packing & Delivery
To ensure safe transit and zero contamination or damage to the slots, our packaging adheres to strict export standards:
- Anti-corrosion & water painting surface treatment prior to packing.
- Protection caps applied securely to both ends.
- Fully wrapped in waterproof paper and bundled for maximum protection during sea freight.