This article will introduce three types of drillin fluid chiller methods: natural evaporative mud cooling method; low temperature solid conduction mud cooling method; forced cooling of drilling fluid chiller device.

High temperature mud often appears in medium and high temperature geothermal wells and deep drilling. Due to the high temperature of the bottom of the well, the temperature of the mud rising to the surface will also be greatly increased. When the mud temperature is higher than 75℃, it will scald the operator of the drilling platform and bring serious safety hazards. At present, there are the following three methods for the drilling fluid chiller in high-temperature geothermal wells and deep drilling.

1. Natural evaporative mud cooling method.

Mud flowing along the mud tank will evaporate and naturally cool down. To manipulate this phenomenon, a method of lengthening the wheel circuit of the mud tank is adopted. This method is generally used in environments where the drilling mud flow is not large, the temperature of mud is less than 55℃, and the temperature difference between the inlet and outlet wells is less than 5℃.

2. Low temperature solid conduction mud cooling method.

Putting low-temperature solids into the mud pool is like ice cubes cooling the mud through the heat conductor. This method is generally used for the cooling of water-based mud. Generally used in environments where the surface mud temperature is not high and the temperature difference between the inlet and outlet wells is not large.

3. The forced cooling of the drilling fluid chiller device.

When the temperature of the mud is high and the temperature difference between the inlet and the outlet is too large, a special mud cooling device is required to achieve forced cooling of the high-temperature mud. Drilling fluid chiller is a special equipment used to cool the high temperature mud in the well during drilling process. It is currently a more efficient and safe mud cooling method. Its working principle is that the sand pump draws the mud and discharges it to the cooling tank spray system, and relies on the electric fan at the top to forcibly draw the cold air outside the tank into the tank. The hot mud is evenly distributed to each sprinkler by the upper spray system, and the hot mud is sprayed down onto the packing layer through the sprinkler. The mud and cold air exchange heat in the filler; the wet and hot air is discharged from the tank by the fan, and the cooled mud enters the water collection tank.

Drilling Fluid Chiller

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