KING COBRA Mud Conditioner

The BRANDT KING COBRA mud conditioner uses a combination of hydrocyclones and a KING COBRA shale shaker to separate solids from liquid.

Render of King Cobra Mud Conditioner
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Combining hydrocyclone simplicity with durable, dependable shaker performance

The BRANDT™ KING COBRA™ mud conditioner uses a combination of hydrocyclones and a KING COBRA shale shaker to separate solids from liquid. The combination of hydrocyclone cones is dependent on the specific application and typically consists 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. To further increase separation efficiency, an optional variable-frequency drive (VFD) G-Force Controller is available for the KING COBRA so the operator may tune the G-forces exerted on the shaker bed to one of three settings: 6.1 (norm.), 6.7 (high), or 7.3 (max.).

The screens used on the shale shaker determine the cut point for the mud conditioner unit. When weighted muds are used, screens ensure that most of the weighted material is returned to the mud system. Typically, API 170 screens (>82.5 to 98.0 microns) are used to reduce the amount of weighted material discarded by the screens.


  • Cones constructed of lightweight, durable, polymeric material
    • Provide high temperature tolerance, chemical and erosion resistance, and low-cost replacement
  • Cones are connected to feed tube via preferred flange connections
    • Offer tight, leak-proof operation
  • Cones use involute feed entry
    • Separate 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
    • Ensure customers receive proper configuration for their application
  • Unique, durable shaker basket design
    • Provides optimal mud coverage of screen surface
  • Few replacement parts for shaker
    • Provide 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, +5º)
    • Keep mud pool volume small to increase screen life
  • Use of four repairable pretension screens on shakers
    • Offers 33.4 ft² (3.1 m²) of repairable screening areas, offering cost savings
  • Individual seals on every screen
    • Eliminate screen leakage
  • Patented pin-and-hole screen securing system
    • Secures screens to shaker basket snugly to eliminate slipping or sliding once in place

KING COBRA Mud Conditioner Specifications and Dimensions

Hydrocyclones 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 to 600 gam/min
(1893 to 2271 L/min)
400 to 500 gal/min
(1514 to 1893 L/min)
50 to 65 gam/min
(189 to 246 L/min)
D50 cut point in water 60 to 80 µm 50 to 70 µm 15 to 20 µm
D50 cut point in drilling fluid ≥200 µm 90 to 120 µm 35 to 70 µm
Weight each 105 lb (48 kg) 85 lb (39 kg) 13 lb (6 kg)

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

Shale Shaker Options

Shale shakers COBRA KING COBRA
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

*G-force dependent on starter options.

Typical Mud Conditioner Configurations

Mud conditioners COBRA 16/2 KING COBRA 16/2 KING COBRA 24/3
Quantity desilter
cones (4-in.)
16 16 24
Quantity desander
cones (12-in.)
2 2 3
1,000 gal/min
(3785 L/min)
1,000 gal/min
(3785 L/min)
1,500 gal/min
(5678 L/min)
L × W × H 106 × 80 × 101 in.
(2692 × 2032 × 2565 mm)
120 × 87 × 106 in.
(3048 × 2210 × 2692 mm)
138 × 90 × 118 in.
(3505 × 2286 × 2997 mm)
Weight 6,200 lb (2815 kg) 7,900 lb (3587 kg) 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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