Sunday 27 December 2009

Drilling Mud


Fluid drilling mud is used, which is designed to assist the process of drilling. Composition and physical properties of the mud is very influential on a drilling operation because one of the factors that determine the success or failure in a drilling is dependent on the drilling mud. Drilling speed, efficiency, safety, and cost of drilling depends on the drilling mud used.

The main functions of drilling mud are:
1. Cutting lifted to the surface.
2. Control the formation pressure.
3. Cools and lubricates the chisel and drillstring.
4. Cleaning the drill hole bottom.
5. Helping formation stability.
6. Protect productive formations.
7. Assisting in formation evaluation.

Drilling mud functions mentioned above is determined by the chemical composition and physical properties of mud. Errors in controlling the physical properties of the mud will cause the failure of the function of mud which in turn can lead to resistance drilling and finally lead to large losses.
Drilling mud generally has four components or phases:

a. Liquid phase (liquid or oil).
b. Reactive solids, ie solids which react with water to form colloids (clay).
c. Inert solids (solids that do not react).
d. Phase chemistry.
While grouping based drilling mud fluid phases, namely:
1. Freshwater mud (Fresh Water Mud).
2. Mud, salt water (Salt Water Mud).
3. Oil in water emulsion mud.
4. Oil base and oil base mud emulsion.
5. Gaseous drilling fluids.

Drilling mud is made and used in accordance with its function and in accordance with the formation to be penetrated. During the drilling process progresses, the drilling mud is always controlled their properties, especially the physical properties and chemical properties.
Drilling mud has become one of the important considerations in optimizing drilling operations. Therefore, to maintain and control the physical properties of drilling mud to fit desired, it is necessary to know the basics of drilling operations, especially regarding drilling mud, which covers some practical event, namely:

1. Measurement of density, sand content, and measurement of oil content in drilling mud.
2. Measurement of viscosity and gel strength.
3. Measurement of thick mud cake and filtration.
4. Chemical analysis of drilling mud.
5. Drilling mud contamination.
6. Measurement prices MBT (methylene Blue Test).

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