COBRA Mud Conditioner

The BRANDT COBRA Mud Conditioner uses a combination of hydrocyclones and a COBRA shale shaker to separate solids from liquid.

Render of  COBRA  Mud Conditioner
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Combining hydrocyclone simplicity with durable, dependable shaker performance.

The BRANDT™ COBRA™ Mud Conditioner uses a combination of hydrocyclones and a COBRA shale shaker to separate solids from liquid. The combination of hydrocyclone cones is dependent on the specific application and typically consist of desander cones (10- or 12-in.) and desilter cones (4-in.) properly sized to handle over 125% of the flow rate.

These cones are mounted above the screen deck of the shale shaker. The drilling fluid (mud) is fed first through the hydrocyclones, where the discharge cascades down over the shale shaker screens. This reduces the amount of mud attached to the discharged cuttings. The screens used on the shale shaker determine the cut point for the mud conditioner unit. When weighted muds are used, screens are selected to ensure that the majority of the weight material is returned to the mud system. Typically, API 170 screens (>82.5 to 98.0 microns) are used to reduce the amount of weight material discarded by the screens.


  • Cones constructed of lightweight, durable, polymeric material
    • Provides high temperature tolerance, chemical and erosion resistance, and low-cost replacement
  • Cones are connected to feed tube via preferred flange connections
    • Offers tight, leak-proof operation
  • Cones use involute feed entry
    • Separates solids more efficiently than conventional tangential entry, conserving fluid and reducing wear at the feed inlet
  • Wear-resistant ceramic insert molded into the underflow of 4-in. desilter cones
    • Resists abrasion to a higher degree than the standard polymeric material, ensuring long-lasting life
  • Customized cone configurations
    • Ensures customers receive proper configuration for their application
  • Unique, durable shaker basket design
    • Provides optimal mud coverage of screen surface
  • Few replacement parts for shaker
    • Provides a small parts inventory, enabling cost savings
  • Linear shaker motion
    • Separates and rapidly discharges solids
  • Patented drying deck of shaker
    • Reduces mud losses via a dry solids discharge
  • Exclusive shaker deck angles (0º, +5º, +5º)
    • Keeps mud pool volume small to increase screen life
  • Utilization of three repairable, pretension screens on shakers
    • Offers 25.4 ft² (2.4 m²) of repairable screening area, offering cost savings
  • Individual seals on every screen
    • Eliminate screen leakage
  • Patented pin-and-hole screen securing system
    • Secures screens to shaker basket snugly so they will not slip or slide once in place

COBRA Mud Conditioner Hydrocyclone Specifications

All hydrocyclones require 75 feet of head; D50 is dependent on the feed particle size. 2-inch cones are also available upon request.

  12-in. 10-in. 4-in.
Nominal inner diameter 12 in. (305 mm) 10 in. (254 mm) 4 in. (102 mm)
Material Cast urethane Cast urethane Cast urethane
Capacity 500–600 gal/min (1893–2271 L/min) 400–500 gal/min (1514–1893 L/min) 50–65 gal/min (189–246 L/min)
D50 cut point in water 60–80 µm 50–70 µm 15–20 µm
D50 cut point in drilling fluid ≥200 µm 90–120 µm 35–70 µm
Weight each 105 lb (48 kg) 85 lb (39 kg) 13 lb (6 kg)

COBRA Mud Conditioner Specifications

*G-force dependent on starter options.

Dimensions (L × W × H) 94⅝ × 66⅛ × 61 in. (2404 × 1680 × 1549 mm) 120¼ × 66⅜ × 66 in. (3054 × 1686 × 1676 mm)
Weir height 41 in. (1041 mm) 41 in. (1041 mm)
Weir height opt 37 in. (940 mm) 37 in. (940 mm)
Weight 3,800 lb (1725 kg) 4,800 lb (2179 kg)
Screen quantity 3 4
Deck angle 0°, +5°, +5° 0°, +5°, +5°, +5°
Basket angle Adjustable, -7 to +3° Adjustable, -5 to +3°
Screen type Pretension, repairable Pretension, repairable
G-force 5.4 Nominal G’s Up to 7.3 G’s*
Deck area 25.4 ft2 (2.4 m2) 33.4 ft2 (3.1 m2)
Motor type (2) Vibra-Motors (2) Vibra-Motors
Motor power (each) 2.0 hp (1.5 kW) 2.5 hp (1.9 kW)
Vibration motion Linear Linear

Typical Mud Conditioner Configurations

Quantity Desilter Cones (4-in.) Quantity Desander Cones (12-in.) Hydrocyclone Capacity
COBRA 16/2 Mud Conditioner 16 2 1,000 gal/min (3785 L/min)
KING COBRA 16/2 Mud Conditioner 16 2 1,000 gal/min (3785 L/min)
KING COBRA 24/3 Mud Conditioner 24 3 1,500 gal/min (5678 L/min)

Mud Conditioner Dimensions and Weights

  L × W × H Weight
COBRA 16/2 Mud Conditioner 106 × 80 × 101 in. (2692 × 2032 × 2565 mm) 6,200 lb (2815 kg)
KING COBRA 16/2 Mud Conditioner 120 × 87 × 106 in. (3048 × 2210 × 2692 mm) 7,900 lb (3587 kg)
KING COBRA 24/3 Mud Conditioner 138 × 90 × 118 in. (3505 × 2286 × 2997 mm) 9,100 lb (4131 kg)
  • BRANDT COBRA and KING COBRA Mud Conditioners Spec Sheet
  • BRANDT Mud Conditioner Headers Spec Sheet (English)
  • BRANDT Mud Conditioner Headers Spec Sheet (Portuguese)
  • BRANDT Mud Conditioner Headers Spec Sheet (Spanish)
  • BRANDT Mud Conditioner Headers Spec Sheet (French)
  • BRANDT Mud Conditioner Headers Spec Sheet (Arabic)

BRANDT Mud Conditioners

BRANDT mud conditioners are manufactured in Conroe, Texas, and are engineered to meet the specifications demanded by the application in most cases. Mud conditioners are just one of the many solids control and waste management offerings that BRANDT supplies to the oil and gas industry. NOV Quality Management System is ISO 9001-2000 certified.

Mud conditioners were first designed to remove fine-drilled solids from weighted muds without excessive loss of barite and fluid. Their primary purpose now is to desand weighted muds. Due to advancements in fine screening at the flowline, the mud conditioner’s use in the weighted hole section is much more limited than in previous decades. Consequently, the mud conditioner is used in this application to desand the mud until the primary shakers can maintain the sand content of the mud to a trace. The secondary use of a mud conditioner occurs when environmental conditions prohibit the use of a reserve pit. The mud conditioner is used to reclaim liquid from the hydrocyclone underflow while drilling hole sections with unweighted mud.

Typically, multiple desander cones (12- or 10-in.) and desilter cones (4-in.) are mounted above the screen deck of a shale shaker. The size of the solids (in microns) removed by these units is directly correlated to the size of the cone. The larger the cone, the larger the size of the particle removed and vice-versa. The mud is fed first through the hydrocyclones, where it subsequently cascades down over the shale shaker. The remaining solids, including barite, are returned to the mud system.

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