A shimmy drilling tool for downhole friction and torsion reduction

Abstract

The invention discloses a downhole swing vibration drilling tool for friction lowering and torsion reduction. The downhole swing vibration drilling tool comprises an upper joint, an upper spray nozzle, a cylinder, a middle spray nozzle, an upper positioning sleeve, a lower positioning sleeve, a lower spray nozzle, a flow dividing plate, a radial vibration short section and a lower joint. The upperspray nozzle, the upper positioning sleeve, the middle spray nozzle, the lower positioning sleeve and the lower spray nozzle constitute two resonant cavities; high-pressure drilling liquid flows through the two resonant cavities, pressure pulse vibration is generated through the self-excitation principle, and vibration force drives the drilling tool to generate axial vibration; the pressure pulsation drilling liquid impacts the flow dividing plate after flowing through the resonant cavities, and enters the radial vibration short section through small holes in the flow dividing plate; and thedrilling liquid impacts a vibrating small ball in the radial vibration short section, and the vibration small ball enables the pressure of the drilling liquid flowing through short-section spray nozzles to be changed and enables the drilling liquid to act on the cylinder to achieve radial vibration. The downhole swing vibration drilling tool can generate axial vibration and radial vibration simultaneously, the structure is simple, the size is short, and friction lowering and torsion reduction of directional drilling operation are more facilitated.

Description

technical field [0001] The invention relates to a downhole vibration tool used in the development process of oil drilling, in particular to a shimmy drilling tool used for reducing friction and torsion in the drilling process. Background technique [0002] Drilling engineering is a project with large investment and high risk in the development of oil and gas reservoirs, and its cost accounts for more than 50% of the cost of exploration and development. At present, horizontal wells, highly deviated wells, and extended-reach wells are used more and more in my country's oil and gas drilling, mainly due to their better input-output ratio. However, during the drilling process of extended-reach wells and horizontal wells, with the increase of well depth, horizontal section and extended-reach section, problems such as large downhole friction, difficult transmission of drilling pressure, and low operating efficiency have emerged. Therefore, the friction release problem in the slidi...

AI Technical Summary

Problems solved by technology

Although it can achieve the function of reducing friction and reducing torsion, its structure blocks the fluid flow, which is not conducive to the overall circulation of drilling fluid

[0004] In addition, the existing hydraulic oscillators that can simultaneously generate axial and radial vibration functions are complex in structure, high in cost, and too large in size to be widely used, which to a certain extent restricts the drilling rate and oil and gas Therefore, it is necessary to provide a downhole tool with a relatively simple structure, which can generate axial and radial vibrations at the same time, and has a good effect of reducing friction and torque, so that it can be widely used in the field of oil drilling and production. application

Images