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Hollow whipstock capable of conducting tie-back

A skewer and hollow guiding technology, which is applied in drilling equipment, drilling equipment and methods, earthwork drilling and production, etc., can solve the problems of inability to guide branch wellbore strings and strings into branch wellbore, and achieve favorable The effect of entering the operation, saving operation time and improving the success rate

Active Publication Date: 2020-11-17
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing skewer is recovered after the casing window is opened, and cannot guide the string of the lateral wellbore into the lateral wellbore; and it is generally solid, without the function of hanging the window connector

Method used

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  • Hollow whipstock capable of conducting tie-back
  • Hollow whipstock capable of conducting tie-back
  • Hollow whipstock capable of conducting tie-back

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Embodiment Construction

[0027] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.

[0028] like Figures 1 to 3 As shown, the reconnectable hollow oblique device provided by the present invention includes a hollow return part 1, a hollow guide part 2 and a hollow reinsertion part 3 arranged in sequence from top to bottom, the three are arranged concentrically with the central axis, and the hollow guide part 2 is located between the hollow return part 1 and the hollow return part 3, the upper end of the hollow guide part 2 is connected with the lower end of the hollow return part 1, and the lower end of the hollow guide part 2...

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Abstract

The invention relates to a hollow whipstock capable of conducting tie-back. The hollow whipstock comprises a hollow tie-back part, a hollow guide part and a hollow plug-back part which are coaxially arranged. The upper end of the hollow guide part is connected with the lower end of the hollow tie-back part. The lower end of the hollow guide part is connected with the upper end of the hollow plug-back part. A first through hole is formed in the hollow tie-back part. The first through hole penetrates through the two end faces of the hollow tie-back part. A first inclined plane is arranged on theside wall of the hollow tie-back part. A second through hole is formed in the hollow guide part. The second through hole penetrates through the two end faces of the hollow guide part. The first through hole is communicated with the second through hole. A second inclined plane is arranged on the side wall of the hollow guide part. The inclination direction of the first inclined plane is opposite to the inclination direction of the second inclined plane, and a recess is formed between the first inclined plane and the second inclined plane. According to the hollow whipstock capable of conductingtie-back, the problem that a traditional whipstock cannot guide a branch borehole string to enter a branch borehole is avoided, so that the technical problems of low success rate and long operation time of the branch borehole string entering the branch borehole are solved.

Description

technical field [0001] The invention relates to the technical field of oil drilling equipment, in particular to a reconnectable hollow skewer. Background technique [0002] The branch well technology can effectively improve the connectivity between oil and gas wells and reservoirs, expand the drainage area, improve the dynamic profile of oil flow, and increase the productivity of a single well. It is widely used in oil and gas fields at home and abroad. [0003] The window connector realizes the effective connection between the branch wellbore and the main wellbore, and is mostly guided by a bent joint, and is hung at the bottom of the casing window through wall hooks and other equipment. The risk of the existing technology is that the length, angle, and offset of the bent joint are relatively large, resulting in a large friction when the branch wellbore string is run in the branch wellbore, and the liner is not easy to put in place; and the bent joint is in the downhole. T...

Claims

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Application Information

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IPC IPC(8): E21B7/08
CPCE21B7/061
Inventor 李中范白涛刘兆年武广瑷王彬邱浩曹砚锋李汉兴张海龙黄辉
Owner CNOOC TIANJIN BRANCH
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