Drilling fluid has at least the following ten functions

Drilling fluid has at least the following ten functions：

Clean the bottom of the well carry rock debris. Keep the bottom of the well clean, avoid repeated cutting, reduce wear, improve efficiency.

Cooling lubrication of drill bits drill strings. Reduce the temperature of the drill bit, reduce drilling tool wear, improve the service life of the drilling tool.

Prevent pollution wellbore collapse of oil gas reservoirs.

Balance (control) formation pressure, prevent blowout leakage, prevent contamination of drilling fluid by formation fluids.

Suspended rock debris weighing agent. Reduce the settling speed of rock debris avoid sand settling.

Sand rock debris can settle on the ground.

Effective transmission of hydraulic power. Transmit the power required for downhole power drilling tools the hydraulic power of the drill bit.

The weight of the drill pipe casing. The buoyancy effect of drilling fluid on drilling tools casing can reduce the load on the lifting system during the tripping process.

Provide a large amount of stratigraphic data, use drilling fluid, electrical logging, rock cuttings logging, other methods to obtain downhole data.

The hydraulic fracturing of rocks. The high-speed jet formed by the drilling fluid through the nozzle can directly break assist in breaking rocks.

Basic type

According to the dispersed continuous phase, drilling fluid can be divided into water-based drilling fluid, oil-based drilling fluid, gas drilling fluid, etc.

Drilling fluid mainly consists of liquid phase, solid phase, chemical treatment agents. The liquid phase can be fresh water, brine, crude oil, diesel oil emulsion (mixed oil emulsion inverse lotion). Solid phase includes useful solid phase useless solid phase. Chemical treatment agents include inorganic, organic, polymer compounds.

water-base drilling fluids

Water-based drilling fluid is a sol-gel suspension mixed system with water as the dispersion medium, bentonite, weighing agent, various chemical treatment agents as the dispersion phase. Its main components are water, clay, weighing agents, various chemical treatment agents.