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Rolling ball resistance reduction device

A technology of drag reducer and ball, applied in the direction of drill pipe, casing, drill pipe, etc., can solve the problems of poor service life, poor drag reduction effect, complex structure, etc., achieve long service life, improve strength, and improve drag reduction efficiency effect

Inactive Publication Date: 2012-06-13
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned technical problems, the present invention proposes a ball drag reducer, which has a relatively simple structure, low cost, high strength and long service life, and completely solves the problems of poor drag reduction effect and structural Technical problems of complexity, low strength and poor service life

Method used

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  • Rolling ball resistance reduction device
  • Rolling ball resistance reduction device
  • Rolling ball resistance reduction device

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Experimental program
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Embodiment 1

[0028] As a preferred embodiment of the present invention, the present invention includes a body and a ball, and at least two helical grooves extending along the axial direction of the body and penetrating through the surface of the body are provided. The cross-section of the helical grooves It is circular with a notch, and a plurality of balls are semi-enclosed in the spiral groove, the width of the notch is smaller than the diameter of the ball, and the top surface of the ball protruding from the spiral groove is higher than the surface of the body, and the plurality of balls They are in contact with each other and move freely in 360-degree directions, and each spiral groove is evenly distributed on the surface of the body.

Embodiment 2

[0030] As the best implementation mode of the present invention, on the basis of Embodiment 1, a joint is provided at one end of the body, and a conversion joint is provided at the other end of the body. The spiral groove is provided through the surface of the joint. The spiral groove is simultaneously arranged through the surface of the joint and the conversion joint. The number of the spiral grooves is 8.

[0031] Realization process: The ball 2 is placed in the spiral groove on the surface of the body 3. Since the distance between the ball top and the body 3 is larger than before, the distance between the body 3 and the well wall is also increased, reducing the distance between the body 3 and the well wall. The possibility of direct contact with the well wall effectively reduces the frictional resistance between the two; More flexible mobility improves the drag reduction effect; when the directional well or horizontal well drills a borehole with a large diameter differenc...

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Abstract

The invention discloses a rolling ball resistance reduction device, which relates to the technical field of design and manufacture of resistance reduction devices for oil drill tools and comprises a body and rolling balls. The surface of the body is provided with at least two spiral grooves extending along the axial direction of the body and penetrating through the body, the cross sections of the spiral grooves are circles provided with notches, the plurality of rolling balls are arranged in the spiral grooves in half-seal mode, the width of the notches is smaller than the diameter of the rolling balls, the top faces of the rolling balls protruding out of the spiral grooves are higher than the surface of the body, the plurality of rolling balls are in mutual contact and move freely in 360-degree directions, and the spiral grooves are evenly distributed on the surface of the body. The rolling ball resistance reduction device is simple in structure, low in cost, high in strength and long in service life, and thoroughly solves the technical problems of poor resistance deduction effect, complex structure, low strength and short service life which exist in the prior art.

Description

[0001] technical field [0002] The invention relates to the technical field of design and manufacture of drag reducing devices for oil drilling tools, in particular to a ball drag reducer used for reducing the frictional resistance between the well wall and the drill string during drilling. Background technique [0003] The drag reducer can reduce the friction between the well wall and the drill string during the drilling process, which is beneficial to the drilling of directional wells and horizontal wells; in the prior art, the drag reducer is basically a roller drag reducer. A roller drag reducer has multiple rollers. According to the inclination of the directional well, generally 3 rollers form a group, and each group is distributed around the drag reducer at an interval of 120°. In actual use, when the borehole diameter When the diameter of the roller drag reducer is not much different, the roller drag reducer can play a better role in reducing drag; however, due to th...

Claims

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Application Information

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IPC IPC(8): E21B17/10
Inventor 刘彬何超陈立陈晓彬李兵胡畔
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD