Hydraulic underground brake device for cable logging tractor

Abstract

The invention discloses a hydraulic underground brake device for a cable logging tractor. The hydraulic underground brake device solves the problems that an existing device is complex in structure, inconvenient to control, large in occupied space and prone to brake locking. According to the technical scheme, the device comprises a hydraulic push rod assembly connected with a tractor oil way and supporting arms, the supporting arms are symmetrically arranged on the two sides of a push rod of the hydraulic push rod assembly, the rear ends of the supporting arms are hinged to a support at the front end of the hydraulic push rod assembly, and damping rolling wheels are arranged at the front ends of the supporting arms; guide grooves are formed in the supporting arm in the axial direction, a sliding block is arranged at the front end of the push rod, guide blocks are symmetrically arranged on the two sides of the sliding block, and the guide blocks are located in the guide grooves in the corresponding sides. The device is simple in structure, small in size, capable of sharing a tractor oil way, capable of avoiding rapid downward sliding of downhole tools and preventing the brake locking problem, purely mechanically controlled, high in safety and reliability, low in manufacturing cost and arrangement difficulty and easy to maintain and repair.

Description

technical field [0001] The invention relates to a downhole tractor, in particular to a hydraulic downhole brake device for a cable logging tractor used for the tractor. Background technique [0002] Now more and more horizontal wells are logging, the wellbore trajectory is an upturned well section, and some even have an upturned inclination of 110°. When the downhole logging tool passes through the upturned well section under the action of external force, the operation is completed. After that, the downhole tool needs to be pulled out through the cable, but when the downhole tool reaches the upturned well section, the downhole tool will slide forward under the action of gravity, and there is a cable in front of the downhole tool. When the cable is twisted into the instrument string, it will cause an operation accident. [0003] Therefore, it is desirable to design a hydraulic braking device for a tractor, which can avoid the problem of rapid downhole tools sliding down when...

AI Technical Summary

Problems solved by technology

But still there are following problems: (1) this scheme adopts to drive support arm and brake arm to open when suppressing, although the principle that draws in during depressurization can satisfy the basic requirement of braking, but because the brake device can not cooperate with the opening and closing of traction wheel The retraction is synchronized, so this structure makes it impossible to directly share the oil circuit of the tractor, and it is necessary to separately install a fuel tank component or arrange an oil circuit control device, which makes the design and layout of the entire equipment complicated, occupies a limited space of the tractor, and is difficult to maintain. The problem of poor reliability, the single oil circuit needs high-temperature small-volume hydraulic components, underground high-temperature control circuit, etc., and the cost is expensive (currently domestic and foreign high-temperature high-pressure small-volume hydraulic components, such as solenoid valves, safety valves, etc. are super expensive, and the circuit control board is high temperature (2) In this scheme, the second end of the brake arm is hinged with the first end of the support arm through the second hinge shaft, and the second end of the support arm is hinged at the support arm joint through the third hinge shaft On the top, the piston rod moves axially to drive the support arm and the brake arm to rotate together to open, so that the brake arm can be pressed against the inner wall of the downhole casing to obtain relatively large friction and support force. It is necessary to adjust the output of the oil tank assembly 1 Oil pressure to control the pressure of the brake arm 3 on the inner wall of the downhole casing, further increasing the difficulty of control, once the output pressure is too large, it will cause the problem of downhole brake lockup

(3) When the brake device is working in the well, it uses a separate oil route to generate pressure from the plunger pump. After the work is completed, it is necessary to remove the internal oil pressure and retract the support arm. Usually, the pressure is relieved through the solenoid valve. Such a small volume Inside, the main oil circuit of the solenoid valve is very small, even less than 1mm in diameter. If the oil cannot be filtered clean, there is a risk of blockage. Once blocked, it will cause serious logging accidents, (there are countless couplings downhole , there are steps, once stuck inside the steps, it will inevitably cause an accident)

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