The stainless-steel wool screen1  is a patented 3D filter formed by wrapping layers of compressed stainless-steel wool onto  perforated basepipe, then covering it with a  perforated outer shroud. The screen’s  40% open flow area and greater than 3,000 Darcy  air permeability result in almost no additional  resistance to flow in the near-wellbore area or  across the screen.

Stainless-steel wool screen.

Open flow area, angular pores, and  3D filtration

The screens provide higher initial and  retained permeability and superior well  productivity. The high open flow area, combined  with a wide range of angular pores and 3D  filtration, minimizes flow restriction and the risk  of erosion. The screens are insensitive to  variations in formation particle size, reducing  the costs of sample collection, analysis, and lab  testing. They also decrease the risks associated  with running a screen into a well where the  particle size distribution is not known or varies  from heel to toe.

3D pore structure

The screen’s high flow capacity is a  function of its unique 3D pore structure. The  angular pores range in size from 15 to 600 um and are difficult to plug because they retain  harmful sand while allowing fines smaller than  30 microns to pass through. These fines would  otherwise get trapped at the sandface-screen  interface and cause plugging over time.

APPLICATIONS

  • Reservoirs with poorly defined grain size  distributions or varied grain sizes
  • Openhole horizontal wells needing  a stand-alone screen
  • High-viscosity oil-producing wells
  • Thermal and steam-assisted gravity  drainage wells
  • Water producers and injectors requiring  sand control
  • Remedial sand control recompletions  inside failed completions
  • Wells requiring an alternative to  gravel packing
  • Wells needing a support screen for  gravel-packing or frac-packing
  • High-flow-rate ESP wells
  • Exploration wells where particle sizes  are unknown

BENEFITS

  • High flow capacity and plugging resistance optimizes the balance of sand control and well productivity
  • High erosion and corrosion resistance result in fewer workovers and longer well life. 
  • High mechanical strength and flexibility  limit damage from load-force stresses.
  • Screen reduces completion costs  compared with gravel packs and many  conventional screen alternatives.

FEATURES

  • 40% open flow area
  • 3,000 Darcy initial permeability
  • High retained permeability and  plugging resistance
  • Increased erosion resistance

Stainless-Steel Screen Specifications

Basepipe Jacket Perforated Basepipe
Basepipe Size, 
in 
[mm]
Basepipe  Weight, 
 lbm/ft
 [kg/m]
Min. ID,
in 
[mm]
Nominal  Thread  Type Coupling OD,  
in 
[mm]
Max. OD,
In
 [mm]
Max. Shroud  OD, in 
[mm]
Holes per Foot Holes per  Foot Perf. Diameter,  in 
[mm]
Open Flow  Area, %
2.375 [60.30] 4.6 [6.8] 1.995 [50.70] NUE 2.88 [73.0] 3.01 [76.4] 3.01 [76.4] 783 108 0.375 [9.5] 13.3
2.875 [73.00] 6.4 [9.5] 2.441 [62.00] NUE 3.50 [88.9] 3.51 [89.1] 3.51 [89.1] 911 132 0.375 [9.5] 13.5
3.500 [88.90] 9.2 [13.7] 2.992 [76.00] NUE 4.25 [108.0] 4.25 [108.0] 4.06 [103.1] 1,071 84 0.5 [12.7] 12.5
4.000 [101.6] 11.0 [16.4] 3.459 [87.90] NUE 5.20 [132.1] 5.20 [132.1] 4.56 [115.8] 1,199 96 0.5 [12.7] 12.5
4.500 [114.3] 11.6 [17.3] 4.000 [101.6] LTC or BTC 5.00 [127.00] 5.06 [128.5] 5.06 [128.5] 1,327 108 0.5 [12.7] 12.5
12.6 [18.8] 3.958 [100.5] LTC or BTC 5.00 [127.00] 5.06 [128.5] 5.06 [128.5] 1,327 108 0.5 [12.7] 12.5
5.000 [127.0] 15.0 [22.3] 4.408 [112.0] LTC or BTC 5.56 [141.3] 5.56 [141.3] 5.56 [141.3] 1,455 120 0.5 [12.7] 12.5
5.500 [139.7] 17.0 [25.3] 4.892 [124.3] LTC or BTC 6.05 [153.7] 6.06 [153.9] 6.06 [153.9] 1,583 132 0.5 [12.7] 12.5
6.625 [168.3] 24.0 [35.7] 5.921 [150.4] LTC or BTC 7.39 [187.7] 7.39 [187.7] 7.32 [185.9] 1,872 156 0.5 [12.7] 12.3
7.000 [177.8] 26.0 [38.7] 6.276 [159.4] LTC or BTC 7.66 [194.5] 7.66 [194.5] 7.66 [194.5] 1,968 168 0.5 [12.7] 12.5
7.625 [193.7] 29.7 [44.2] 6.875 [174.6] LTC or BTC 8.50 [215.9] 8.50 [215.9] 8.34 [211.7] 2,128 180 0.5 [12.7] 12.3
8.625 [219.1] 32.0 [47.6] 7.921 [201.2] LTC or BTC 9.63 [244.5] 9.63 [244.5] 9.34 [237.1] 2,640 204 0.5 [12.7] 12.3
9.625 [244.5] 40.0 [59.5] 8.835 [224.4] LTC or BTC 10.63 [269.9] 10.63 [269.9] 10.34 [262.5] 2,640 228 0.5 [12.7] 12.3