Expandable Bi-Center Drill Bit
Inactive Publication Date: 2015-10-22
NORTHERN SOLUTIONS +1
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Benefits of technology
The patent describes a drill bit and a downhole tool for enlarging a borehole in a subterranean formation. The drill bit has a bit body with a central axis and a cutting structure at its end. It also includes a mandrel that can move axially within the bit body. The downhole tool has a central bore and a blade that can move radially outward. The method involves increasing the pressure of drilling fluid in the bore and sliding the blade with the inclined surface of the mandrel. The technical effects of this invention include improved drilling efficiency, reduced bit wear, and better hole quality.
Problems solved by technology
However, a larger bit may not be capable of passing through the relatively smaller casing string and borehole to reach the desired zone for larger borehole drilling.
However, these bits are typically limited to a single size such that drilling selectively larger and smaller boreholes is not possible with a given bit, and unfortunately, replacing a drill bit with a different sized drill bit (to form a smaller or larger section of the borehole) often requires bringing the drill bit, along with the entire length of drillstring to the surface.
This action is typically referred to as a “trip” of the drill bit and drillstring and requires hours of additional personnel and equipment time, such that each trip to the surface dramatically increases the total costs of drilling the borehole.
Method used
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[0020]The following discussion is directed to various exemplary embodiments. However, one skilled in the art will understand that the examples disclosed herein have broad application, and that the discussion of any embodiment is meant only to be exemplary of that embodiment, and not intended to suggest that the scope of the disclosure, including the claims, is limited to that embodiment.
[0021]Certain terms are used throughout the following description and claims to refer to particular features or components. As one skilled in the art will appreciate, different persons may refer to the same feature or component by different names. This document does not intend to distinguish between components or features that differ in name but not function. The drawing figures are not necessarily to scale. Certain features and components herein may be shown exaggerated in scale or in somewhat schematic form and some details of conventional elements may not be shown in interest of clarity and concis...
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A downhole tool for enlarging a borehole, the tool including a body having a central axis, an uphole end, a downhole end, a bore extending from the uphole end, and an aperture extending radially from the bore to a radially outer surface of the body. Additionally, the tool includes a mandrel disposed in the bore, the mandrel having a first end, a second end, a radially outer surface, and a radially inner surface. The mandrel outer surface includes an inclined surface. Further, the tool includes a first blade disposed in the aperture. The first blade has a radially retracted position and a radially extended position configured to engage with a borehole sidewall to enlarge the borehole. The mandrel is configured to translate axially relative to the body to slide the inclined surface along the first blade to transition the first blade between the radially refracted and extended positions.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. provisional patent application Ser. No. 61 / 982,028 filed Apr. 21, 2014, and entitled “Expandable Bi-Center Drill Bit,” which is hereby incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.BACKGROUND[0003]Embodiments described herein relate generally to earth-boring drill bits used to drill a borehole for the ultimate recovery of oil, gas, or minerals. More particularly, embodiments described herein relate to expandable drill bits and actuation systems for such bits.[0004]In drilling a borehole (or wellbore) into the earth for the recovery of hydrocarbons from a subsurface formation, it is conventional practice to connect a drill bit to the lower end of a conduit (e.g., drill string, coiled tubing, etc.). The drill bit is then rotated either alone or along with the conduit with weight on bit (WOB) applied to engage the ea...
Claims
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Login to View More IPC IPC(8): E21B10/32E21B7/28
CPCE21B7/28E21B10/322E21B10/265
InventorDILLER, CARL WILLIAMENGLISH, CANDICEHARRIS, ROBERT D.MILNE, JOHN ROBERTROSS, MATTHEW ORA
OwnerNORTHERN SOLUTIONS