Concept: The drilling fluid cleaning cycle is to
remove the harmful solid debris, reserve the clean drilling fluid to meet the demand of
drilling fluid spec under the drilling
process. Drilling fluid cleaning system is the term of all drilling fluid
solids control equipments used in the oil drilling.
Function: To prevent
the oil well from clogging, breaking, and decrease the drilling torque and
friction resistance, reduce the pressure fluctuations of the hollow suction,
increase the drilling speed, extend the drilling bit life, and reduce wear and tear of the
equipments. Methods: The common methods are mixture-thin methods, swap methods,
machine methods and additive-chemical methods. Use different separation
function machinery is machine method is by using screening,
centrifugal separation and gravity separation to separate the solid phase
according to the different size and density, therefore, to control the solid
phase in the drilling fluid.
1 The technical process
of the drilling
fluid cleaning system and
the combination of the fluid cleaning equipment.
The technical process
of complete group of drilling fluid cleaning system should meet the specification
of five level
solid phase control (screening, degassing, desanding, desilting,
centrifuge) and the provoke the drilling fluid. The merger of each solids control equipment is
very important, the through out of one to five level of mud cleaning equipment
should each corresponding, and the spacing of the proper distance were is
appropriate. To have certain overlap
during the cleaning process, make the smaller particles of the processing
incomplete in the up one had been disposed in the next solids control equipment.
2 Drilling fluid cleaning cycles
The mud back from the opening
of well through the pipeline and conveyed the drilling fluid to the shale shaker.
The first phase of cleaning completed by shale shaker, then entered the mud tank, the drilling
fluid flowed from the mud
tank through the tank slot into the desander and desilter (if detect the exits
of gas, vacuum degasser will process to remove the gas) the fluid after processing of
the centrifugal steps and through the tank slot enters the inhalation cabin. The cleaned fluid then will reuse for
lubricate and cooling the drill bit.
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