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Monthly Archives: September 2015

Unique features of desander and desilters

Desander is the second equipment in solid control system, it is used to separate the solid phase particles whose diameter is more than 44um from drilling fluid. The shale shaker produced by DC Machinery has the advantages of low noise, large handing capacity, long service life of shaker screen and so on.


Features of DC Desander 

  1. Desander hydrocyclone use 100% polyurethane material.
  2. The design of hydrocyclone lathedog is convenient to maintain.
  3. Mud tangent enter into the hydrocyclone from narrow rectangular track to decrease the upper hydrocyclone flocculant flow.
  4. Structure is compact, save the floor area.
  5. Freely choose one, two or three sets hydrocyclone.
  6. Users can install by themselves.

Desilter is the third class equipment in solid control system, it is used to separate the solid particles whose diameter is 15-44um from drilling fluid. The desilter produced by DC Machinery has the advantages of large handing capacity, high separation ability and convenient operation.


The unique characteristics 

  1. The stainless steel ball valve design can be choosed, closed the any desilter inlet ball valve can remove the single hydrocyclone and check, but don’t influence the use the desilter.
  2. Mud tangent enter into the hydrocyclone from narrow rectangular track to decrease the upper hydrocyclone flocculant flow and urge solid particles rapidly move to the wall of hydrocyclone.
  3. Freely choose one, two or three sets hydrocyclone.
  4. Users can install by themselves.

Installation steps of Vacuum degasser

Vacuum degasser can wipe off the invaded gas from drilling mud quickly, restore drilling mud proportion, keep mud viscosity performance and improve the quality of drilling fluid. Vacuum degasser produced by DC Machinery has the advantages of compact structure, reasonable design and so on


According coercive measures make the gas is separated from gas cut drilling fluid, ensure the performance of mud is good. So the drilling fluid mud purification system is widely used.

Installation and use

The installation should be steady, connection, tension and reasonable.

The filter screen should be installed in the air inlet place of exhaust pipe, preventing particles enter into vacuum degasser


Checking before start

The rotation of motor, vacuum pump and the main motor should be unanimous with mark direction.

The end of discharge pipe and inlet pipe should be immersed in mud pool at the same time.

Turn the coupling number ring to ensure it is didn’t locked or damage phenomenon.


After use

After use we must discharge the water in the pump or gas water separator.

It is must be tested run every week.

Before enter into gas layer, it is must be normally operated.

Functions of mud tanks in drilling fluid solid control system

Mud tank is petroleum drilling fluid solid control system, mud tank circulating system according bottom tank sharp divided into rectangle tank and cone tank. Tank use plate cone structure or corrugated board structure.

Tank surface and corridor use antiskid strip screen slab, tank screen railing use square steel pipe manufacturing.

Mud tank circulating system tank surface outfit pure water pipeline to clean tank surface equipment, tank surface halftone treated by zinc immersion. The upper tank ladder use U-steel as the main part, the anti-skidding strip type halftone as the pedal, the two sides guardrail set the insurance hook.

mud tanks

Petroleum drilling mud tank set the stander sand prevention, rainproof shelter, the inner tank set heat insulation pipeline.

As the mud carrier, mud tank is a obbligato part in mud circulating system, it can complete mud aggravating, mixing, solid liquid separation, degassing and other process; mud tank transport the circulating mud from well mouth to mud pump, according to the related solid control equipment, the solid phase particles is separated step by step, and according mix to aggravate, make it can meet the requirements of drilling technology.

The degassing device on the mud tank can eliminate the harmful gas in mud, to guarantee working field environment requirements and mud proportion. Mud tank uses electric centralized control, in polar region low temperature district, the tank set heating supply system.

How to solve the problems of centrifugal pumps

When the centrifugal pump impeller inlet liquid pressure below the delivery temperature of liquid under pressure gasification, the liquid begin to gasify. Meanwhile, the other gas is soluble in the fluid maybe overflow. At the same time, forming large small bubbles in fluid, this phenomenon is called cavitation.

The small bubbles is produced by gasified and dissolving overflow flow together in impeller passage way, when the pressure is increasing gradually, the bubbles will be broken by surrounding fluid pressure, then it will be to condensation. When the bubbles are broken and be to condensation. The gas area volume is decrease gradually and form into cavity in the passage way.


The impacting to centrifugal pump

Causing noise and vibration

The cavitation makes the pump produce noise and it is bad to the pump. when the bubbles are broken, the machine may vibrate. In this condition, pump can’t work on.

Causing working parameter is decreased

When the cavitation phenomenon is serious, the large bubbles in impeller will block the impeller passage way, the continuity of fluids will be damaged, the flow, head and efficiency of pump will be decrease, this condition pump can’t work on.

Causing pump impeller be damaged

When pump cause the cavitation, because of the impact of mechanical corrosion and chemical corrosion, the impeller will be damaged, the impeller can be corroded through when cavitation is serious.

The method of prevent cavitation

The performance of medium, delivery temperature, the length and diameter of intake pipeline, the number of parts of intake pipeline and the installation height of centrifugal pump are all influence the cavitation. In order to preventing cavatation, it demands decrease the delivery temperature, currently install, the design of pump and intake pipeline and installation height are all have strict requirements.

Concrete classification of vacuum degasser

Vacuum Degasser is used to eliminate the gas in gas cutting drilling fluid, its treating capacity should reach to full flow treating. Degasser is must installed behind the shale shaker and before centrifugal pump.

So when drilling fluid obtain large gas, so the centrifugal pump will occurring cavitation, it not only make centrifugal pump performance is decrease, production voice and vibration and loss service life but also can make centrifugal pump can’t work or damaged.

The function of degasser have two; the one is ensure drilling fluid performance is stabilize, preventing blowout and well kick accident and ensure drilling safety.

vacuum degasser

The other one is ensure hydrocyclone can regular work. When drill middle and deep well, gas well and gas oil well must be matched vacuum degasser.

The degassers are used to clean the gas in the drilling fluid, to ensure the drilling fluid property relatively stable, to guarantee the steady operation of swirlers.

The degassers can be grouped into two kinds: ordinary pressure type and vacuum type. The ordinary pressure degasser is to use the centrifugal to take out gas to invade the mud, with the help of centrifugal force to make the mud spraying in the jet tanks and striking on the wall to make gas releasing. The vacuum degasser is to use the suction of the centrifugal, forming negative pressure in the vacuum tanks, under the action of drilling fluid at atmospheric pressure, through the suction pipe into the hollow shaft, then by umbrella piece of around the hollow shaft assembly, they jet to the skin of tank.

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