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Under-pipe eye reamer blade

A technology of eye reamer and knife blade, which is applied in construction, drilling equipment and methods, earthwork drilling and mining, etc., and can solve problems such as restricting circular areas

Active Publication Date: 2021-09-28
SCHLUMBERGER TECH LTD BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

New casing strings can be positioned within previously installed casing strings, limiting the annulus available for cementing operations

Method used

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  • Under-pipe eye reamer blade
  • Under-pipe eye reamer blade
  • Under-pipe eye reamer blade

Examples

Experimental program
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Embodiment Construction

[0024] In some aspects, embodiments disclosed herein relate generally to cutting structures for use on drill tool assemblies. More specifically, some embodiments disclosed herein relate to cutting structures for downreamers or other tools used to enlarge a previously existing wellbore.

[0025] According to some aspects of the present disclosure, there is provided a downhole cutting apparatus, such as a downhole reamer, which may include blades. The blade may have an underreamed portion or edge and a reverse reamed portion or edge. In one or more embodiments, the downhole cutting device may be an expandable tool, and the blades may be moved radially between any combination of retracted, partially extended, and fully extended positions. In one or more other embodiments, the downhole cutting device may be a non-extensible downhole cutting tool. For example, in one or more embodiments, the downhole cutting device may be a hole opener with fixed blades.

[0026] now refer to f...

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PUM

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Abstract

A downhole cutting device includes a blade. The blade includes a formation-facing surface having a cutting element coupled thereto. The cutting elements are arranged such that at least one cutting element has a different amount of exposure relative to the formation-facing surface than at least one other cutting element. In some embodiments, a row of cutting elements may have gradually varying exposures. The exposure may be varied such that gauge cutting elements closer to the blade have less exposure than gauge cutting elements further away from the blade. In additional embodiments, the underreamer may include multiple blades. The blades may each have a different configuration in the reverse reaming portion, gauge portion, underreaming portion, any portion thereof, or a combination of the foregoing.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of and priority to US Patent Application No. 62 / 288,209, filed January 28, 2016, which is expressly incorporated herein by reference in its entirety. Background technique [0003] In the drilling of oil and gas wells, concentric strings of casing are installed in the wellbore and cemented as the well is drilled to increasing depths. Each new string of casing may extend from the surface, or may include a liner suspended from a previously installed string of casing. The new casing string can be positioned within the previously installed casing string, thereby limiting the annulus available for cementing operations. Furthermore, with the use of sequentially decreasing diameter casing strings, the flow area available for oil and gas production is reduced. To increase the annulus for cementing operations, and to increase the production flow area, it may be necessary to enlarge the wellbor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/32E21B10/43E21B10/42
CPCE21B10/325E21B10/5673E21B10/5676E21B10/322E21B7/28
Inventor P.特伦克
Owner SCHLUMBERGER TECH LTD BV