Drilling Centralizers for Bottomhole Cleaning and Debris Bed Clearance

Abstract

The invention relates to a drilling centralizer capable of removing rocks and debris beds at the bottom of a well. The drilling centralizer comprises a shell, a stator, a rotor, an upper clamping ring and a lower clamping ring, wherein the shell is internally provided with through holes, and the wall of the shell is provided with knife wings and bypass holes; one end of a stator is axially limited by the upper clamping ring, and the other end of the stator is contacted and connected with one end of the rotor; the other end of the rotor is axially limited by the lower clamping ring and is also sheathed with a rolling bearing; the stator comprises a stator middle flow channel and stator draining channels; the rotor comprises a rotor middle flow channel, rotor side flow channels and rotor driving flow channels; the rotor side flow channels are positioned between every two adjacent rotor driving flow channels and are opposite to the rotor middle flow channel; one end of each rotor driving flow channel is radially provided with a pressure releasing hole; the pressure releasing holes are respectively communicated with the bypass holes and the rotor driving flow channels intermittently in the rotating process of the rotor and are also internally matched with one-way valves. The drilling centralizer has the advantages that the structure is simple, not only can the rock removing capability at the bottom of the well be greatly improved, but also the debris beds can be well damaged and removed, so that the purpose of cleaning a wellbore is achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration engineering machinery, in particular to a drilling centralizer capable of clearing rock at the bottom of a well and removing cuttings beds. Background technique [0002] The needs of the exploration and development situation promote the evolution and development of well types. Wells with complex structures such as directional wells, extended-reach wells, and horizontal wells account for an increasing proportion of oil and gas field exploration and development, and they aim to pursue higher well boreholes. Depth, the extension capability of the longer horizontal section of the wellbore, which also puts forward higher requirements for the ROP and bit footage during the drilling process. During the drilling process, if the cuttings at the bottom of the well cannot be removed in a timely and effective manner, the cuttings will be repeatedly cut, which will affect the ROP ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing centralizer for drilling cannot timely and effectively remove the cuttings at the bottom of the well and the resulting cuttings bed in the process of using fluid as the circulating medium to drill directional wells, extended-reach wells and horizontal wells. A drilling centralizer with simple and reasonable structural design, capable of timely and effectively removing cuttings at the bottom of the well and effectively destroying and removing the cuttings bed.

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