Main winch rapid-descent and confluent return oil regeneration system of rotary drilling rig

Abstract

The invention discloses a main winch rapid-descent and confluent return oil regeneration system of a rotary drilling rig, which includes a main winch motor, a brake, a main valve and a pilot handle, wherein the pilot handle is communicated with the main valve through an oil path, and a special balance valve block for return oil regeneration is connected between the main winch motor and the main valve through pipelines and is controlled and adjusted by a control device. The invention improves the efficiency, accelerates the descent of the main winch, shortens the pore-forming subsidiary operation time, and improves the pore-forming efficiency. The main winch utilizes the own gravity to do work in the descent process, so that an engine is not required to run with full power but run at an idle speed, thereby saving the fuel oil and reducing the CO2 emission from a main unit; braking and speed adjusting control signals come from the pilot handle, so that the system controllability is better in comparison with the original form that motor +BVD balance valve control signals come from the inside of a BVD balance valve, the problem that the winch slides downwards in a stalled state is basically solved, and the damage to a drilling stem and a drilling rig caused by the fall-off of the drilling stem can be effectively prevented.

Description

technical field [0001] The invention relates to a circuit system of a main winch of a rotary drilling rig, in particular to a rapid lowering and confluence return oil regeneration system of the main winch of a rotary drilling rig using a hydraulic winch. Background technique [0002] The main winch circuit system of the existing rotary drilling rig, such as figure 1 As shown, it is composed of brake 1, main winch motor 2, buffer relief valve 3, floating relief valve 10, BVD balance valve block 9, main valve 11, pilot handle 12, of which BVD balance valve block 9 consists of a check valve 4. It consists of one-way valve 6, BVD main valve core 5, third shuttle valve 7 and pressure reducing valve 8. [0003] Its working principle is: the control chamber of BVD main spool 5 is respectively connected to motor oil inlet A and motor oil return port B of main winch motor 2, when the pressure difference between motor oil inlet A and motor oil return port B is less than that of the m...

AI Technical Summary

Problems solved by technology

[0007] The opening control signal of the BVD balance valve block 9 of the original system comes from the main oil circuit of the main hoist motor 2. During the rapid closing process of the main hoist motor 2, due to pressure fluctuations, the oil port pressure changes of the main hoist motor 2 are relatively complicated. Sometimes the BVD balance valve block 9 cannot be effectively closed, causing the drill pipe to stall and fall, that is, the "rod slipping" accident

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