The function of Drilling fluid
(The initial stage of rotary drilling)
In the initial stage of rotary drilling, the main function is to carry cuttings from the bottom of the well to the surface. It is recognized to have at least the following ten functions:
(1) Clean the bottom of the well and carry cuttings. Keep the bottom of the well clean, avoid repeated cutting of the drill bit, reduce wear and improve efficiency.
(2) Cooling and lubricating the drill bit and drill string. Reduce the temperature of the drill bit, reduce the wear of the drill tool, and increase the service life of the drill tool.
(3) Balance the lateral pressure of the wellbore rock, form a filter cake on the wellbore, seal and stabilize the wellbore. Prevent contamination of oil and gas formations and well wall collapse.
(4) Balance (control) formation pressure. Prevent blowout, lost circulation, and prevent formation fluid from polluting drilling fluid.
(5) Suspended cuttings and weighting agents. Reduce the settling speed of cuttings and avoid sand sinking and stuck drilling.
(6) It can sink and remove sand and cuttings on the ground.
(7) Effective transmission of hydraulic power. Transmit the power required by the downhole dynamic drilling tool and the hydraulic power of the drill bit.
(8) To bear part of the gravity of the drill pipe and casing. The buoyancy of the drilling fluid to the drilling tool and the casing can reduce the load of the hoisting system when tripping out the hole.
(9) Provide a large amount of information on the strata drilled. Our product can be used for electrical logging, cuttings logging, etc. to obtain downhole data.
(10) Hydraulic breaking of rocks. The high-speed jet formed by it passing through the nozzle can directly break or assist in breaking rock.
