Intermittent-type downhole tractor

Abstract

The invention relates to an intermittent-type downhole tool tractor, and belongs to the technical field of oil and gas downhole tools. A turbine shaft is mounted in an inner pipe; an output shaft is mounted on the position, below the turbine shaft, in the inner pipe through an output shaft bearing; a bevel pinion is mounted at the other end tip of the output shaft; a transmission mechanism is arranged on the position, below the bevel pinion, in the inner pipe, and the bevel pinion and the transmission mechanism are connected in an engaged mode; an oil cylinder is mounted on the position, belowthe transmission mechanism, in the inner pipe, and a piston rod is mounted in the oil cylinder through a spring; and one end of the piston rod extends to the outer end of the oil cylinder, and the end, extending to the outer end of the oil cylinder, of the piston rod is connected with the transmission mechanism in an intermittent mode. The intermittent-type downhole tractor has the characteristics of simple structure, single power source, high obstacle-crossing capability and large traction force; the problems that an existing tractor is small in traction force and weak in obstacle-crossing capability, consequently during releasing of horizontal well and large-displacement well logging instruments and the like, frictional resistance is large, and releasing is difficult can be effectivelysolved; and the intermittent-type downhole tool tractor is particularly suitable for working under harsh downhole conditions.

Description

technical field [0001] The invention relates to an intermittent downhole tool tractor, which belongs to the technical field of oil and gas downhole tools. Background technique [0002] The downhole tractor, also known as the downhole crawler, is the main transportation tool for horizontal well logging, and it is gradually developing into applications such as micro-hole drilling and downhole operations. Harsh formation conditions place high requirements on the performance of the tractor, and there is no mature high-level product in China at present. Because the driving wheel of the commonly used wheeled tractor has a small contact area with the bushing, the traction force is small and the obstacle surmounting ability is weak. Although the telescopic tractor can provide a large traction force, it is easy to get stuck when encountering a well section with a certain inclination because of its long size. Therefore, it is extremely necessary to develop a tractor with strong obst...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a device with the characteristics of strong obstacle surmounting ability and large traction force, which can effectively solve the frictional resistance caused by the low traction force and weak obstacle surmounting ability of existing tractors when horizontal wells and extended-reach well logging instruments are deployed. Large, castable intermittent downhole tractors for difficult problems

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