Dec 31

Basical information on solids separation

The drilling mud solids and liquid separation (can be said drilling fluid solids control briefly) technology is a special industry to control the suspending particles in drilling mud. After separating harmful solids out and keep useful solid, the drilling fluid will hold capable property for well drilling

The definition on separation between solid and liquid

The solid and liquid separation means the drilling fluid including liquid and solid. Separate solid out of drilling fluid have following function:

1. Recycling expensive and useful solid. Such as recycling barite but disusing fluid

2. Recycling fluid. Such as recycling drilling mud but disusing drill cutting

3. Recycling liquid and solid but disusing partial solid and liquid at the same time

Drilling fluid solid separation system

Drilling fluid solid separation system

According to most of actual drilling mud separation, we mainly do this separation as recycling a little part of solids but majority of fluid. No matter we choose which drilling fluid process manner, we can’t separate solid out of the drilling fluid totally and make the drilling fluid as pure liquid. Even we must keep some solid in driling fluid, such as bentonite, weighting material, lubrication material, block material, etc.

In common solid-liquid separation equipment, there must be solid in drilling fluid, while some liquid will be brought away by solids 

Drilling fluid separation process

When there is restraint on liquid, while particles will move freely in the fluid under the acceleration condition.  At the same time, we can use sedimentation and buoyance lift manner to separate the solid.

To sedimentation, between liquid and solid there should be distance on their density, if the particle can’t move for the restraint. But liquid can flow among solid we can use filtering and screen manner to separate solid

For the solids separation manner, it including following types

1.  Float manner

2. Gravity sedimentation manner

3. Centrigual sedimentation manner. Including hydraulic cyclone type and sedimentation centrifuge.

4. Cake type filtration type

5. Shale shaker separation between solid and liquid. This type of separation on drilling fluid solids control is most effectvie and popular manner. But separated particle will be affected by screen mesh and shaker capacity. It’s hardly to separate out 74 microns solid completely

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written by shale shaker


One Response to “Solids separation principle in drilling fluid system”

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