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Directional control drilling system

一种方向控制、维修系统的技术，应用在定向钻井、钻井设备、土方钻采等方向，能够解决增加弯曲度、增加总时间等问题

Inactive Publication Date: 2009-05-27
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Surface adjustable motor housings require multiple trips, which increases the overall time spent on the well and increases tortuosity

Method used

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  • Directional control drilling system
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  • Directional control drilling system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0051] figure 1 A generally representative drilling system according to a preferred embodiment of the present invention is shown. The system includes a downhole drilling unit comprising a rotary drive system 10 carrying a drill bit 12 . A tool 14 comprising an axial drive system is positioned behind the rotary drive system 10 and is connected to the ground via a control 16 and a non-rotating conveyance 18 such as a cable or a flexible pipe with cables.

[0052] Rotary drive system 10 includes an electric motor by which drill bit 12 is turned. The power of the motor depends on its size, although for many applications, the power of the motor will not exceed 3kW.

[0053]In use, the drilling system is advanced into the wellbore 20 until the drill bit 12 reaches the bottom. Drilling continues by rotating the drill bit 12 using the rotary drive system 10 and advancing the drill bit into the formation using the axial drive system in the tool 14 . The rotation and advancement of ...

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PUM

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Abstract

A drilling system, comprising: a non-rotating conveyance system; a tool connected to the non-rotating conveyance system and including anchors by which the tool can be anchored in position when located in a borehole; a drill bit connected to the tool; a motor for rotating the drill bit; and a directional control system interposed between the tool and the drill bit; wherein, in use, whit the drilling system located in a borehole, the directional control system can be operates so as to displace the drill bit away from the axis of the borehole.

Description

technical field [0001] The present invention relates to a drilling system suitable for drilling subterranean boreholes. In particular, the present invention relates to a drilling system that enables the trajectory of the borehole to be controlled and deviated by controlling the direction in which the system drills while drilling is in progress. Background technique [0002] In the process of drilling a subterranean wellbore, a significant factor in the success of the mission is the time it takes to steer the well in the correct direction and reach the end point properly. Frequent changes in trajectory cause increased borehole tortuosity, which increases the force required to enter and exit the borehole, and also increases the total distance drilled to reach the same target. [0003] Drilling wells using wireline from the lower hole assembly (BHA) to the surface offers several advantages: drilling costs can be reduced and equipment and personnel at work locations can be redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B4/18E21B7/04
CPCE21B2023/008E21B7/068E21B7/067E21B4/18E21B23/001
Inventor S·科特索尼斯C·佩林E·拉夫吕H·德努瓦
Owner PRAD RES & DEV LTD
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