A self-propelled intermittent pulse high-pressure nozzle for radial and horizontal wells

Abstract

The invention discloses a self-propelled intermittent pulse high-pressure spray head for a radial horizontal well. The spray head is provided with a shell which is connected with a concave-type drainage plate through a thread, a spherical groove is formed in the inner wall of the shell, and the two ends of a horizontal shaft are provided with wear-resistant steel balls which are clamped in the spherical groove formed in the inner wall of the shell respectively; an overturning plate is arranged to be hollowed, and the horizontal shaft penetrates through the center. The concave-type drainage plate has a drainage effect and drives the overturning plate to conduct periodic rotation, and the drilling and rock breaking efficiency is improved; high-pressure drilling fluid forms an eddy current under the stirring action of the overturning plate, and the rock breaking speed is increased; along with rotation of the overturning plate, the drilling fluid below the drainage baffle produces an excited oscillation effect, and the energy of the fluid at the outlet of spray nozzles is increased; the groove is formed in the upper portion of the concave-type drainage plate, and the self-propelling capacity of the spray head is improved; the overturning plate adopts a mode that the mass is distributed nonuniformly, when the overturning plate rotates, the spray head is driven to jump continuously, and therefore the friction force between the spray head and a stratum is reduced, and the self-propelling capacity of the spray head is improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, and in particular relates to a self-propelled intermittent pulse high-pressure nozzle for radial horizontal wells. Background technique [0002] In the process of oil exploration and development, high-pressure water jet rock-breaking technology is an efficient rock-breaking method, which has been widely used and researched, and has achieved remarkable results. Hydrojet sidetracking radial horizontal well technology started at the end of the 20th century. It can increase the oil and gas production of a single well and reduce drilling costs. It is especially suitable for increasing production in old oilfields and developing low-permeability oilfields, marginal oilfields, shallow oil layers, heavy oil layers and thin oil layers. It can drill vertical reservoir fractures horizontally to increase the exposed area of ​​oil layers, and can reduce or avoid the occurrence of gas cones and wa...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a self-propelled intermittent pulse high-pressure nozzle for radial and horizontal wells, aiming to solve the problem that the jet impact of the forward nozzle is relatively weak in the current radial and horizontal well drilling technology using self-propelled high-pressure nozzles The problem

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