Hydraulic resistance reducing oscillator for oriented oil and gas field well drilling

Abstract

The invention discloses a hydraulic resistance reducing oscillator for oriented oil and gas field well drilling. The hydraulic resistance reducing oscillator comprises a vibrating mechanism, a power assembly and a bottom assembly. According to the hydraulic resistance reducing oscillator, a telescopic isolating ring capable of floating in a telescopic manner is mounted between the periphery of thelower end of a vibrating shaft and the inner ring end face of an outer shell, and a guiding ring with a conical ring body structure with a larger upper part and a smaller lower part is mounted at thelower end of the vibrating shaft, so that the overflowing path of drilling fluid from the periphery of the vibrating shaft is sealed, the overflowing quantity of the drilling fluid from a drainage cavity in the lower end of the vibrating shaft is reduced, the drilling fluid quantity in a power impact ring cavity between the telescopic isolating ring and the guiding ring is greatly increased, andthe vibrating sensitivity of the vibrating shaft is improved.

Description

technical field [0001] The invention relates to a hydraulic drag-reducing vibrator for guiding oil and gas field drilling. Background technique [0002] During the drilling process, the method of rock breaking is an important factor affecting the drilling speed. Downhole obstruction or stuck drill will seriously affect the drilling process. As the current wellbore becomes more and more irregular, the extended-reach drilling mode faces greater challenges. Reducing friction, reducing sticking accidents in conventional drilling, increasing dynamic drilling pressure, and improving the efficiency of conventional drilling are problems that need to be solved urgently in current drilling projects. Field practice shows that applying appropriate periodic axial vibration to the drill string can effectively reduce the frictional resistance between the drilling tool and the well wall during the drilling process, improve the rock-breaking efficiency of conventional drilling, and reduce t...

AI Technical Summary

Problems solved by technology

Field practice shows that applying appropriate periodic axial vibration to the drill string can effectively reduce the frictional resistance between the drilling tool and the well wall during the drilling process, improve the rock-breaking efficiency of conventional drilling, and reduce the sticking accidents of conventional drilling. And increase the dynamic drilling pressure, which is suitable for various drilling methods such as extended reach well, directional drilling, horizontal drilling, vertical drilling, coiled tubing drilling, etc.; Generally, a disc spring is added between the vibration shaft and the outer shell in the vibration mechanism. When the vibration shaft is driven by the simple harmonic pressure wave from the powertrain, the vibration shaft will perform axial simple harmonic motion. However, when the Belleville spring is actually used, it is easy to wear between the Belleville spring and the vibration shaft and the outer shell, which increases the resistance to the axial movement of the vibration shaft, making the vibration insensitive and unreliable. The driving wear of the disc spring is aggravated, causing the disc spring to sway radially, decomposing a part of the simple harmonic pressure wave in the axial direction, which further makes the vibration shaft insensitive to vibration in the axial direction; When the drilling fluid driven by the assembly makes a dynamic impact on the lower end of the vibrating shaft, the partially impacted drilling fluid will disperse from the inner cavity of the vibrating shaft and the surrounding outside, which will lead to a great attenuation of the impact force of the drilling fluid, and then make the vibrating shaft Vibration sensitivity is limited

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