An adjustable directional drilling device for horizontal wells in unconventional reservoirs

Abstract

The invention discloses an adjustable directional drilling device for horizontal wells in unconventional reservoirs, which includes a drill pipe and a drilling tool, wherein the drill pipe at least includes an outer wall of the drill pipe with certain support and deformation capabilities, and enters into the target The tail end of the outer wall of the drill pipe of the layer is provided with the drilling tool; the drilling tool includes a primary hydraulic motor assembly, a secondary hydraulic motor assembly, a bias guide assembly and a deflection angle adjustment assembly, wherein the primary hydraulic motor The output shaft of the assembly adopts the cardan shaft one connected with the deflection shaft one, the other end of the deflection shaft one is connected with the secondary hydraulic motor assembly, and the output end of the secondary hydraulic motor assembly adopts the deflection shaft two connected with the drill bit and, the bias guide assembly can provide a bias guide force for the deflection shaft one, so that the drill bit can be initially biased and guided; the deflection angle adjustment is provided below the stator part of the two-stage hydraulic motor assembly An assembly for further adjusting the deflection angle of the drill bit.

Description

Technical field [0001] The present invention relates to the field of horizontal well bore, in particular an unconventional reservoirs wells adjustable horizontal directional drilling apparatus. Background technique [0002] Refers to horizontal wells wellbore trajectory to reach the level (deviation angle> 86 °) and continues to extend a length of directional wells, horizontal wells increase the contact area with the target well layer, so that the mine increased well production, improved mining efficiency, reduce production time, so the application of horizontal wells in mining more and more widely. [0003] However, now, in the difficult horizontal well drilling, it is difficult to adjust the angle, if only by angling the drill bit, the drill easily lead to a heavier burden since the additional bias the guide leads to lower transmission efficiency, will further affect the overall drilling efficiency, and difficult to discharge cuttings during the drilling process, so as to ac...

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Problems solved by technology

[0003] However, at present, it is difficult to drill horizontal wells, and the deflection angle is difficult to adjust. If the deflection angle is adjusted only through the drill bit, it will easily lead to a heavy burden on the drill bit. In addition, the transmission efficiency is low due to the offset guide, which will It further affects the overall drilling efficiency, and the cuttings are not easy to discharge during the drilling process, making them accumulate on the drill bit, causing a fault, and the drill bit is stuck. At this time, flushing fluid needs to be injected for flushing, so how to make good use of the flushing fluid has become a concern the key of

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