Hydraulic Fluid

Definition - What does Hydraulic Fluid mean?

Hydraulic Fluid, also known as hydraulic Liquid, is a fluid which serves the purpose of transferring power into hydraulic machinery components. Some of the common types of hydraulic fluids are based on either mineral oil or water. Majority of the equipment used in the drilling operations as well as other operations of the oil and gas industry make use of hydraulic systems which use hydraulic fluids. These fluids have zero compressibility which makes the hydraulic systems work efficiently.

Petropedia explains Hydraulic Fluid

Hydraulic Fluid is one of the essential parts of all hydraulic systems used in the oil and gas industry. There are many important functions of hydraulic fluid in the hydraulic machines, but the primary function of this fluid is to convey power to the hydraulic components. The table below shows the functions as well as the properties of the hydraulic fluid:

Power transfer medium
  • Zero compressibility
  • Faster air release
  • Low foam making and low volatility
Used for heat transfer
  • Good thermal capability as well as conductivity
Used as a medium to seal hydraulic system
  • Highly stable
  • Adequate viscosity
Lubrication Effect
  • Provides lubrication in low temperatures
  • Maintain necessary viscosity in low temperatures
  • Corrosion control
  • Antiwear
Pump efficiency
  • High viscosity index
  • Adequate viscosity to avoid internal leakages
Special function
  • Fire proof
  • Radiations proof
Impact on environment
  • Low toxic when it is new and decomposed
  • Bio-degradable
Life of the fluid
  • Depends on the fluid grade and compatibility of the equipment.
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