How to adjust drilling pressure and speed

Drilling pressure and drilling speed can be adjusted mainly by the following methods:

The role of drilling pressure and drilling speed:

Drilling pressure: Drilling pressure refers to the axial force exerted on the drill bit, which is mainly used to break rocks. Too much drilling pressure will lead to premature wear and even fracture of the drill bit; too little drilling pressure will result in slow drilling speed and low efficiency.

Rotation speed: Rotation speed refers to the rotational speed of the drill bit, which is mainly used for cutting rock. Too high RPM will lead to overheating of the drill bit and shorten its service life; too low RPM will lead to slow drilling speed and low efficiency.

Adjustment method of drilling pressure and speed:

Starting drilling pressure and speed:

Soft stratum: Adopt the maximum displacement of the drilling pump, the rotational speed of about 100rpm, drilling pressure of about 1~2t. Adjust the drilling parameters after drilling about 1m to achieve the optimal mechanical drilling speed.

Harder formations: It takes longer to grind the bottom of the well. The rotational speed should be controlled at 80～120rpm, and the drilling pressure should be gradually increased in 1t increments.

Adjustment during drilling:

Adjustment according to the change of drilling speed: If the drilling speed decreases, the drilling pressure or speed can be increased appropriately; if the drilling speed is too fast, the drilling pressure or speed should be reduced.

Adjustment according to the vibration and noise: If the drilling tool produces strong vibration or noise, the drilling pressure or speed should be reduced.

Adjustment according to the performance of the drilling fluid: If the performance of the drilling fluid deteriorates, the formula of the drilling fluid should be adjusted in time, and the drilling pressure and speed should be adjusted accordingly.

In addition to formation conditions and bit type, the following factors may affect pressure and RPM adjustments:

Performance of drilling fluid: Density, viscosity, and filtration loss of drilling fluid will affect drilling efficiency.

Drilling tool combination: The length, weight, and stiffness of the drilling tools will affect the drilling parameters.

Equipment condition: The power of the drilling rig, the performance of the hydraulic system, etc. will affect the drilling parameters.

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