Global speed control method and device for improving drilling efficiency and safety coefficient

• Main Authors: GOU BAIHONG, HANG DAZHEN
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2020
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ELECTRICITY; FIXED CONSTRUCTIONS; GENERATION; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to the field of drilling and production machinery, and discloses a global speed control method and device for improving the drilling efficiency and the safety coefficient. The method comprises the steps of S1), collecting basic data in real time; S2) calculating the acceleration a required by a large hook to move from the current large hook height position to the height limitposition under the uniform deceleration condition; S3) judging whether the acceleration a is smaller than the minimum intervention acceleration or not; S4) judging whether the large hook is in a light load state or not; S5) judging whether the current large hook speed exceeds the speed limit of the drill bit position or not; S6) judging whether the acceleration a is greater than the maximum braking capacity or not; S7) adjusting a motor according to the maximum braking capability; and S8) enabling a brake to output the maximum braking force. Different speed limit values are adopted for different large hook positions