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One Trip Bottom Hole Assembly and Method for Milling Casing and Directionally Drilling a Lateral Wellbore

a lateral wellbore and one-trip technology, applied in the direction of drilling machines and methods, drilling holes/well accessories, directional drilling, etc., can solve the problem that cutting a window may require multiple trips

Inactive Publication Date: 2021-08-12
WELLBORE INTEGRITY SOLUTIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a way to cut a window in a wellbore casing and drill a lateral wellbore through the window using a steerable bottom hole assembly. The bottom hole assembly includes a downhole motor and a cutting assembly. The motor is locked during orientation of the whipstock downhole, so that its output section does not rotate with respect to the drill string. The motor is then reconfigured to change the angle of rotation of the output section to a second angle that is greater than the first angle and not zero degrees for directional drilling of the lateral wellbore. This allows for the cutting of the window and directional drilling without removing the drill string from the wellbore. The technical effect is the efficient and effective creation of wellbores with directional control.

Problems solved by technology

Cutting a window may require multiple trips.

Method used

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  • One Trip Bottom Hole Assembly and Method for Milling Casing and Directionally Drilling a Lateral Wellbore
  • One Trip Bottom Hole Assembly and Method for Milling Casing and Directionally Drilling a Lateral Wellbore
  • One Trip Bottom Hole Assembly and Method for Milling Casing and Directionally Drilling a Lateral Wellbore

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Embodiment Construction

[0018]In the following description of representative embodiments and examples of the claimed subject matter, like numbers refer to like parts.

[0019]The following description discloses representative, non-limiting embodiments of a downhole tool capable of operating in a milling mode to cut a window in wellbore casing and then changing to a directional drilling mode in which the face of the tool rotates off-axis to allow the tool to be steered.

[0020]The tool is configured so that, in the milling mode, it is capable of, orienting and setting a whipstock, cutting a window in the wellbore's casing, and creating a rat hole, after which it can be changed to a directional drilling mode by adjusting the tool from having no bend to having a bend that changes the orientation of the tool face from zero degrees, which is oriented along the axis of the drill string, to a non-zero degree angle without having to remove the BHA from the wellbore.

[0021]In the simplified, representative embodiment sch...

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Abstract

A bottom hole assembly and method for cutting a window in a cased, oil and gas wellbore and directionally drilling a lateral wellbore through the window without tripping the bottom hole assembly between milling the window and commencing directional drilling of the lateral wellbore.

Description

RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 62 / 972,628 filed Feb. 10, 2021, the entirety of which is incorporated herein by reference for all purposes.FIELD OF INVENTION[0002]The present invention relates to downhole tools and methods for directional drilling and creating a lateral wellbore.BACKGROUND OF INVENTION[0003]A typical oil and gas well being drilled today, especially in shale formations, will have multiple lateral sections called “legs” or “sidetracks” that are started by drilling from an existing wellbore. Using a process referred to sometimes as “sidetracking,” a downhole tool called a “whipstock” is lowered into an existing wellbore on the end of a drill string to a depth at which the leg will be started. Typically, this will be at the kick-off point, which is the depth at which the inclination of the path of the wellbore to be drill will begin to go from generally vertical to a generally horizontal orientation. The w...

Claims

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Application Information

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IPC IPC(8): E21B29/06E21B7/06
CPCE21B29/06E21B7/061E21B7/068E21B7/06E21B29/002
Inventor MACNEIL, DAVID W.
Owner WELLBORE INTEGRITY SOLUTIONS LLC
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