Torsion bar type underground focus suitable for cased wells with any slope

Abstract

The invention relates to a torsion bar type underground focus suitable for cased wells with any slope. The torsion bar type underground focus comprises an outer shell, a motor, a reducer, a driving gear, a driven gear, a shifting bar, a base, a stopping block, a torsion bar, a pendulum bob, an anvil bar, a transmission bar and a tension spring. The motor, the reducer and the driving gear are sequentially connected through the transmission bar, the driving gear is fixedly connected with the transmission bar, the driving gear is in inner meshing with the driven gear, the driven gear and the corresponding part of the base are provided with semi-circular groove holes, a circular groove hole is relatively formed, the shifting bar is inserted into the circular groove hole and provided with an arc-shaped notch corresponding to the outer edge of the base in radian, the shifting bar is connected with the base through the tension spring, the base is fixedly connected with the torsion bar, the stopping block is fixed on the outer shell, the torsion bar is fixedly connected with the pendulum bob, and one end of the torsion bar is fixed on the outer shell. According to the torsion bar type underground focus, the device reliability can be improved, the potential safety hazard that the focus may be clamped in an underground well is thoroughly eliminated, meanwhile, the requirements of large-slope horizontal well logging are met, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum and geological exploration, in particular to a torsion-bar type downhole seismic source suitable for cased wells with any inclination. Background technique [0002] Vibration sources play a vital role in cross-well seismic technology. The mechanical pulse source is one of the six types of sources commonly used at home and abroad, and the most common one is the hammer type. Its working principle is that the support arm is firmly attached to the well wall by pushing the motor, and then the linear motor lifts the weight to a high point and then releases it, thereby generating a vertical impact force acting on the anvil, which passes through the gap between the anvil and the support arm. The inclined plane is converted into a horizontal radial force, and thus radiant energy is transmitted into the formation (see "Patent No. of Heavy Hammer Impact Downhole Vibration Source: ZL92224745.5"). [0003] ...

AI Technical Summary

Problems solved by technology

Once this happens, it is like smashing a huge nail into the cased well, wedged firmly in the well, and the most serious consequence is to directly cause a well to be scrapped

[0004] Although the source was later partially improved, the contact surface between the push arm and the anvil was changed from sliding friction to rolling friction (see "A push force transmission device, patent number: ZL01247024.4"), but its open The traditional working form has not changed, and the inherent safety hazards have not been eradicated

[0005] In addition, since most of the force comes from gravity, as the inclination of the casing hole increases, the attenuation of energy increases, and when it reaches a certain value, the facility will not be able to operate normally

Furthermore, due to the limitations of its own conditions, the linear motor for lifting the weight not only consumes a lot of energy (power about 8KW, requires a three-phase AV380V high-voltage power supply), but also increases the overall size (the instrument is up to 5.5 meters long).

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