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CN-122014126-A - Turbine-driven radial vibration type resistance-reducing centralizer

CN122014126ACN 122014126 ACN122014126 ACN 122014126ACN-122014126-A

Abstract

The invention discloses a turbine-driven radial vibration type resistance-reducing centralizer, which relates to the technical field of petroleum and gas drilling and comprises a centralizer shell, wherein a plurality of blades are arranged on the outer circumference of the centralizer shell, a plurality of ellipsoidal rollers are axially arranged on the blades at intervals, a hydraulic power conversion module, an eccentric excitation generation module and a rigid excitation conduction module are axially arranged inside the centralizer shell, the eccentric excitation generation module comprises a rotating shaft and an eccentric weight arranged on the rotating shaft, the hydraulic power conversion module comprises a turbine stator and a turbine rotor, the turbine stator is fixedly arranged in the centralizer shell, the turbine rotor is arranged on the rotating shaft and is opposite to the turbine stator, the rigid excitation conduction module comprises a rotating ring and bearings, the rotating ring is sleeved at two ends of the rotating shaft, the outer diameter of the rotating ring is in matched connection with the inner diameter of the bearings, and the outer ring of the bearings is fixedly connected in the centralizer shell. The invention reduces friction between the drilling tool and the well wall and improves the transmission efficiency of the horizontal section bit pressure.

Inventors

  • SUN SHIHUI
  • WANG BIAO
  • ZHAO JIAKANG
  • ZHANG TIANYU
  • LU HAOTIAN
  • BI XUELIANG

Assignees

  • 东北石油大学

Dates

Publication Date
20260512
Application Date
20260409

Claims (7)

  1. 1. The turbine-driven radial vibration type drag reduction centralizer is characterized by comprising a centralizer shell (1), wherein a plurality of blades (2) are arranged on the outer circumference of the centralizer shell (1), a plurality of ellipsoidal rollers (3) are embedded and installed on the blades (2) at intervals along the axial direction, the long axis direction of the ellipsoidal rollers (3) is consistent with the extending direction of the blades (2), and a hydraulic power conversion module, an eccentric excitation generation module and a rigid excitation conduction module are axially arranged inside the centralizer shell (1); The eccentric excitation generating module comprises a rotating shaft (4) and an eccentric weight (5), wherein the eccentric weight (5) is fixedly arranged on the shaft body of the rotating shaft (4), and the mass center of the eccentric weight (5) deviates from the rotation center of the rotating shaft (4); The hydraulic power conversion module comprises a turbine stator (6) and a turbine rotor (7), wherein the turbine stator (6) is fixedly arranged in the centralizer shell (1), and the turbine rotor (7) is arranged on the rotating shaft (4) and is opposite to the turbine stator (6); The rigid excitation conduction module comprises a rotating ring (8) and a bearing (9), wherein the rotating ring (8) is sleeved at two ends of the rotating shaft (4), the outer diameter of the rotating ring (8) is connected with the inner diameter of the bearing (9) through spline fit, and the outer ring of the bearing (9) is fixedly connected in the centralizer shell (1).
  2. 2. A turbine driven radial vibration drag reduction centralizer according to claim 1, characterised in that the axial position of the turbine stator (6) is defined within the centralizer housing (1) by a first sleeve (11) and a second sleeve (12), the axial position of the turbine rotor (7) being defined by a rotor limit snap spring (13).
  3. 3. The turbine-driven radial vibration type drag reduction centralizer according to claim 1, wherein the axial position of the eccentric weight (5) is defined by a weight limiting clamp spring (10), a rectangular groove is formed in the inner ring of the eccentric weight (5), a shaft key (41) is arranged on the rotating shaft (4), and the shaft key (41) is matched with the rectangular groove to achieve torque transmission.
  4. 4. The turbine-driven radial vibration type resistance-reducing centralizer according to claim 1, wherein the rotating ring (8) is of a thin-wall structure, an inner ring and an outer ring of the rotating ring are connected through a plurality of radial connecting ribs (82), a drilling fluid flow passage is formed between every two adjacent connecting ribs (82), a rotating ring rectangular groove (81) is formed in the inner ring of the rotating ring (8), and the rotating ring rectangular groove (81) is matched with an axle key (41) on the rotating shaft (4) to transmit torque.
  5. 5. The turbine-driven radial vibration type drag reduction centralizer according to claim 4, wherein the inner ring of the rotating ring (8) is of a single-side opening structure, so that the rotating shaft (4) can be assembled conveniently, and the other end of the rotating ring is provided with a step structure for realizing axial limiting of the rotating shaft (4).
  6. 6. A turbine driven radial vibration drag reduction centralizer according to claim 1, characterised in that the blades (2) are of helical configuration, evenly distributed along the outer circumference of the centralizer casing (1).
  7. 7. A turbine driven radial vibration drag reduction centralizer according to claim 1, characterised in that the ellipsoidal rollers (3) are in line contact with the borehole wall for distributing contact stresses and reducing lateral slip.

Description

Turbine-driven radial vibration type resistance-reducing centralizer Technical Field The invention relates to the technical field of petroleum and natural gas drilling, in particular to a turbine-driven radial vibration type resistance-reducing centralizer. Background In petroleum and natural gas drilling engineering, especially in horizontal well, large displacement well and deep well operation, the friction resistance between the drill string and the well wall is one of the key factors for limiting the mechanical drilling speed and the transmission efficiency of drilling pressure. Along with the increase of the length of the horizontal section, the dead weight of the drill string causes the drill string to cling to the lower well wall, a larger contact positive pressure is formed, the drill string is difficult to slide smoothly due to the existence of static friction, and even the bit pressure cannot be effectively transmitted to the drill bit when serious, so that the drilling efficiency and the well track control precision are affected. In order to reduce the frictional resistance between the drill string and the borehole wall, various drag reducing centralizer structures have been proposed in the prior art. For example, some centralizers are provided with universal balls on the centralizer strips, sliding friction is converted into rolling friction by utilizing the rolling characteristics of the balls, and other structures are provided with rollers on the outer shell of the centralizer, so that the technical scheme of reducing resistance is realized through the contact between the rollers and the well wall. However, the universal ball structure has multidirectional rolling capability, lateral sliding is easy to generate under high contact pressure, so that the stability of a drilling tool track is poor, point contact is adopted between the ball body and a well wall, contact stress is concentrated, local crushing of the ball body or a well wall mud cake is easy to occur, the roller structure is easy to block or wear under a sand-containing or high-wear environment, and the drag reduction effect is remarkably reduced after long-term use. Therefore, how to realize stable and efficient resistance reduction effect under complex well bottom environment and ensure drilling tool track control precision at the same time is a technical problem to be solved urgently by those skilled in the art. Disclosure of Invention The invention aims to overcome the defects in the prior art, provides a turbine-driven radial vibration type drag reduction centralizer, which generates radial centrifugal force by driving a turbine and an eccentric weight to rotate at a high speed through drilling fluid, the static friction between the drilling tool and the well wall is actively broken and converted into a dynamic friction state, and the friction between the drilling tool and the well wall is obviously reduced by combining the line contact rolling antifriction of the ellipsoidal rollers, so that the transmission efficiency of the horizontal section bit pressure and the track control precision are improved. In order to achieve the above purpose, the present invention adopts the following technical scheme: The turbine-driven radial vibration type drag reduction centralizer comprises a centralizer shell, wherein a plurality of blades are arranged on the outer circumference of the centralizer shell, a plurality of ellipsoidal rollers are embedded and installed on the blades at intervals along the axial direction, the long axis direction of the ellipsoidal rollers is consistent with the extending direction of the blades, and a hydraulic power conversion module, an eccentric excitation generation module and a rigid excitation conduction module are arranged inside the centralizer shell along the axial direction; The eccentric excitation generating module comprises a rotating shaft and an eccentric weight, wherein the eccentric weight is fixedly arranged on the shaft body of the rotating shaft, and the mass center of the eccentric weight deviates from the rotation center of the rotating shaft; The hydraulic power conversion module comprises a turbine stator and a turbine rotor, the turbine stator is fixedly arranged in the centralizer shell, and the turbine rotor is arranged on the rotating shaft and is opposite to the turbine stator; The rigid excitation conduction module comprises a rotating ring and a bearing, wherein the rotating ring is sleeved at two ends of the rotating shaft, the outer diameter of the rotating ring is connected with the inner diameter of the bearing through spline fit, and the outer ring of the bearing is fixedly connected in the centralizer shell. Further, the axial position of the turbine stator is defined within the centralizer casing by a first sleeve and a second sleeve, and the axial position of the turbine rotor is defined by a rotor limit clip spring. Further, the axial position of the eccentric weight is l