Classification and Application of Drilling Fluid Decanter Centrifuge

The drilling fluid centrifuge is usually installed at the final stage of the drilling mud circulating system, mainly for the suspension of the solid phase particle diameter ≥2μm separated from the suspension, or separate two different liquid in emulsion with different densities and are not mutually immiscible . Drilling fluid centrifuge is very effective for oilfield drilling and industrial services, especially for the environmentally sensitive areas. It has high recovery rate, make solids control effectively, can significantly reduce mud supplement and handle costs.

Drilling Mud Decanter Centrifuge Classified by Working Principle:

1, Drilling Fluid Decanter Centrifuge: This is the centrifugal separator by using centrifugal sedimentation separate the suspension liquid. The suspension added the bowl under the action of centrifugal force is formed an annular liquid layer, wherein the solid particles settle to the bowl wall to form a sediment. Clear liquid discharged through the bowl overflow port or drum pipette, it is called separated liquid. After separation done,the sediment discharged by manual or mechanical methods.

Drilling fluid decanter centrifuge is widely used, particularly suitable for the separation when centrifugal filtration due to the solid particles easily clog the filter media and the filtration resistance is too large, excessive loss of the fine particles, but the humidity of sediment is high. Solid-liquid phase density difference is small, small solid particles or liquid viscosity of the suspension should be difficult to separate, the high selective separation factor drilling screw decanter centrifuge drum extend the suspension residence time (for example, reduced feed the amount or using a long drum, etc.), can ensure the separation of liquid clarification.
 

2, Drilling fluid centrifuge drum: the inner cylindrical body with a plurality of meshes in a fixed tact type casing is rotated, both ends of the housing is equipped with hydraulic seals, the inner cylinder shaft extends outwardly through a seal, to be treated slurry and dilution water from the top left of the input housing, the rotation of the inner cylinder, the slurry in the annular space between the inner and outer cylinder is rotated under the action of centrifugal force the solid phase material barite and other large particles fly to the inner wall of the outer cylinder, by an adjustable choke nozzle discharge. Choke mouth opening degree adjusting the pump speed or flow rate can be adjusted bottom stream. While the slurry is a slow sinking of light through the sieve into the simplified inner cylinder is discharged from the hollow shaft. Such a large amount of drilling mud centrifuge processing, recyclable 82% to 96% of barite.

The drilling fluid centrifuge according to centrifugal force, speed, separation point and into the pulp capacity can be divided into:

1, The drilling fluid barite recovery centrifuge: speed of 1600 ~ 1800r / min, a centrifugal force of 500 to 700 times gravity. Low density solids separation point is 6 to 10 microns, high density solids separation point 4 to 7 microns. Into the plasma volume is generally 2.3 ~ 9m3 / h. This drilling fluid centrifuge to remove colloids, control of plastic viscosity.

2, High-speed drilling fluid centrifuge: speed of 2500 ~ 3000 r / min, the centrifugal force from 1200 to 2100 times the force of gravity. Separation point of up to 2 to 5 microns, is determined by the speed of the slurry into the type of fluid to be separated, the fluid used to remove the centrifuge 2 to 5 microns.

3, A large amount of processing drilling fluid centrifuge: the amount of slurry into 23 ~ 45 m3 / h, speed is 1900 ~ 2000 r / min. Centrifugal force is about 800 times the force of gravity. Separation point 5 to 7 microns. Such a centrifuge is used to remove the drilling fluid is greater than 5 to 7 microns solid phase.

In China solids control industry, KOSUN is a solids control leader and expert in drilling waste management. KOSUN is capable of providing customers with such four series as oil & gas drilling solids control equipment, centrifuge, drilling waste treatment equipment and drilling security equipment, including 25 categories of products,such as shale shaker, shale shaker screen, desander, desilter, vacuum degasser, centrifugal pump, submersible slurry pump, vertical cuttings dryer,shear pump,mud agitator, mud gun, drilling fluid mud cleaner, decanter centrifuge, jet mud mixer, mud tank, diesel tank, water tank, complete solids control system,etc.