Longitudinal absorber for reducing perforation instantaneous shock vibration force

Abstract

The invention relates to a longitudinal absorber for reducing perforation instantaneous shock vibration force. The longitudinal absorber comprises a pressure guide tube, an inner sleeve sleeved outside the pressure guide tube and an outer sleeve sleeved outside the inner sleeve; two ends of the pressure guide tube are respectively connected with an upper connector and a lower connector, a connection position between the pressure guide tube and the upper connector is fixed through threads, an internal cavity of the pressure guide tube is always communicated with that of the upper connector, and the pressure guide tube penetrates through an internal cavity of the lower connector to be communicated with the outside; a spring is further sleeved outside the inner sleeve, the spring and the outer sleeve are arranged in parallel, and an outer casing is sleeved outside the spring; and sealing pieces are arranged at the connecting position of the upper connector and the pressure guide tube and at the connecting position of the upper connector and the inner sleeve, and the sealing pieces are further arranged at the connecting position of the inner sleeve and the outer sleeve and at the connecting position of the lower connector and the pressure guide tube. The longitudinal absorber effectively solves the problem that a motive seal of a conventional perforation absorber is easy to damage, weakens the perforation instantaneous shock vibration force, changes the liquid compression vibration attenuation environment, improves safe reliability and is simple and reasonable in structural design and strong in operability.

Description

technical field [0001] The invention relates to perforation damping technology for oil and gas wells, in particular to a longitudinal shock absorber for reducing the instantaneous impact vibration force of perforation. Background technique [0002] At present, there are mainly two methods of vibration reduction for oil and gas well perforation, hydraulic and mechanical, which are mainly used for the protection of testing tools in the joint construction of perforation testing. With the further development of perforation technology, especially the perforation laboratory of Shengli Oilfield found that there is a close relationship between the pressure change at the moment of perforation and the perforation effect. Here comes the challenge. First of all, the sliding sealing performance of the inner and outer shaft sleeves of the current shock absorber is reduced; secondly, the internal compression structure makes the detonator withstand instantaneous pressure, which is prone to...

AI Technical Summary

Problems solved by technology

First of all, the sliding sealing performance of the inner and outer shaft sleeves of the current shock absorber is reduced; secondly, the internal compression structure makes the detonator withstand instantaneous pressure, which is prone to false explosion; because the shock absorber is filled with liquid of the same pressure when pressurized, the shock absorber Loss of vibration damping elasticity, so that its original vibration damping performance disappears

[0003] The field use and the laboratory have verified the defects of the current shock absorber. The dynamic seal is often damaged during the compression and stretching movement under the influence of temperature and pressure. The main reason is that the diameter of the sliding seal is too large, resulting in friction Increased area increases potential for seal damage

At the same time, since the internal liquid is squeezed during the compression process, once the compression process is too fast, the internal liquid may be suppressed if the internal liquid is not discharged in time, which increases the risk of the pressure detonating device at the lower part being detonated by mistake

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