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Reduced flow milling

a technology of flow milling and cuttings, which is applied in the direction of cutting machines, drilling pipes, drilling holes/well accessories, etc., can solve the problems of clogging or damage of pumps, affecting additional operations, and unique challenges of plug milling, so as to reduce the size of cuttings, reduce the flow, and reduce the effect of flow

Inactive Publication Date: 2016-03-31
CONOCOPHILLIPS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes methods and tools to reduce the flow of fluid in front of the drill bit while milling. This helps to keep the cuttings longer at the surface, resulting in smaller pieces that are easier and faster to remove. By eliminating or reducing the forward jetting fluid, the time between the bit and the plug increases, promoting smaller cutting sizes. The drilling fluid can be diverted with a blind crossover or within the drill bit to reduce or prevent flow to the cutting face.

Problems solved by technology

Unfortunately, plug milling provides unique challenges that aren't encountered during standard drilling.
These materials, if left in the wellbore may clog or damage pumps, interfere with additional operations, or fall back trapping the bit, or other equipment, in the hole.

Method used

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Embodiment Construction

[0018]Turning now to the detailed description of the preferred arrangement or arrangements of the present invention, it should be understood that the inventive features and concepts may be manifested in other arrangements and that the scope of the invention is not limited to the embodiments described or illustrated. The scope of the invention is intended only to be limited by the scope of the claims that follow.

[0019]As used herein, ‘crossover’ is a connector designed to transition from a first (drillstring) size to a second (drill bit) size. A ‘blind crossover’ is a crossover which fully, or partially, prevents flow down the center of the drillstring and fully, or partially, diverts flow to the well bore before reaching the drill bit.

[0020]A ‘drill bit’ is a tool used for scraping, crushing, or both, the material to be milled usually as part of a rotational motion. Two different types of drill bits exist: fixed cutter and roller cone. A fixed cutter bit is one where there are no mo...

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PUM

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Abstract

Methods and apparatus to reduce flow in front of the drill bit while milling improve milling debris size. Reducing flow on the drill bit face while milling allows the drill cuttings to remain at the drilling surface longer and reduce the size of the cuttings. The smaller cuttings increase the ease and speed of cutting removal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a non-provisional application which claims benefit under 35 USC §119(e) to U.S. Provisional Application Ser. No. 62 / 057,231 filed Sep. 30, 2014, entitled “REDUCED FLOW MILLING,” which is incorporated herein in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]None.FIELD OF THE INVENTION[0003]The present invention relates generally to milling drill cuttings while drilling. More particularly, but not by way of limitation, embodiments of the present invention include drilling with reduced flow, methods of reducing flow while drilling, and drill bits designed to mill drill cuttings while drilling.BACKGROUND OF THE INVENTION[0004]During hydrocarbon production from underground reservoirs, plugs are used for a variety of procedures. Once the procedure is complete, the plug may require removal. Frequently the plug is removed by drilling through the plug with a drill bit. The drill bit cuts the plug into smalle...

Claims

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Application Information

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IPC IPC(8): E21B10/61E21B29/00E21B17/042
CPCE21B29/002E21B2010/607E21B17/042E21B10/61E21B21/103E21B29/12
Inventor GRUBB, SCOTT, A.SKUFCA, JASON, M.HEARN, DAVID, D.
Owner CONOCOPHILLIPS CO