Cycle of cleaning for the drilling fluid

Concept: The cleaning cycle of drilling fluid 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 empty suction, increase the drilling speed, extend the drilling bit life of use, and reduce wear and tear of the equipments.

Methods: The usual 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 work with each other, and the spacing of the proper distance were is appropriate.  To have certain repeating cleaning 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 present 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.