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Downhole tool

A tool, drilling technology, applied in the field of drilling tools, which can solve problems such as limitations

Inactive Publication Date: 2006-03-15
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it needs to provide a sliding seal through the packer, this design limits its ability to provide extended drilling depths
Also, it must supply drilling mud from the surface and return the annulus of drilling mud and cuttings

Method used

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Examples

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Embodiment Construction

[0028]Referring now to the drawings, there are shown various embodiments of the invention. While all of these embodiments described herein are open hole, it should be understood that this could also be a cased well, or include a drill string or production tubing. All such understandings are included in the use of the term "drilling". Also, in the context of well and tool arrangements, the term "upper" is used for a direction toward the surface, and "down" for a direction away from the surface, even if the well in question is not vertical. The first embodiment of the present invention is in figure 1 Shown in , includes a drive unit 10 that includes connections for cables (not shown). The drive unit 10 is basically a tractor unit such as that described in US 5,954,131. However, in the configuration described here, it sits on top of the tool string and is used to push the tools along the well rather than pull them behind it. Also, wires are used to provide power and data belo...

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Abstract

A downhole tool comprising: an axial drive unit ( 10 ) having a connection for an electric power cable extending up the borehole, and including an anchoring mechanism ( 12, 16 ) operable in the borehole between a first configuration in which the anchoring mechanism resists rotational and axial movement of the unit, and a second configuration in which the anchoring mechanism is moveable axially in the borehole, an axial drive mechanism that moves the anchoring mechanism axially down the borehole when in the second configuration; a motor ( 28 ) mounted on the drive unit at the downhole end thereof; an hydraulic pump ( 30 ) connected to the motor, the pump providing a source of hydraulic power; and a functional unit connected below the hydraulic pump and powered thereby, operation of the axial drive mechanism acting to move the functional unit axially down the borehole.

Description

technical field [0001] This invention relates to downhole tools, and more particularly to drilling tools for use in such wells as oil, water and natural gas wells. Background technique [0002] In the construction and handling of subterranean wells, there are many basic techniques for transporting and operating drilling tools. For example, when drilling, a drill bit is secured at the lower end of a drill string formed by a series of empty drill pipes joined end to end. By rotating the drill string at the surface, or by using a perforating motor, the drill bit is rotated, and this rotation and the weight applied to the bit allow drilling to occur. To remove drilled material and to help pump drilling mud (commonly known as "mud") down the inside of the drill string during drilling to exit the drill bit and surround the annulus outside the drill string The drilled material ("cuttings") is transported back to the surface. Drilling mud also provides support for drilling and ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/14E21B4/18E21B7/06
CPCE21B7/061E21B23/14E21B4/18
Inventor 雅克·奥尔班
Owner PRAD RES & DEV LTD
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