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Drill bit and drilling system with underreamer- and stabilisation-section

A technology of lower reaming part and stabilizing part, applied in directional drilling, drill bits, drilling equipment, etc., can solve problems such as system inefficiency

Inactive Publication Date: 2006-06-21
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Finally, in significantly oversized boreholes, the support casing stabilizer is no longer in contact with the borehole wall, which will render the system ineffective

Method used

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  • Drill bit and drilling system with underreamer- and stabilisation-section
  • Drill bit and drilling system with underreamer- and stabilisation-section
  • Drill bit and drilling system with underreamer- and stabilisation-section

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Embodiment Construction

[0034] In the drawings, the same elements are provided with the same reference numerals.

[0035] In the example, the object is a geological formation, and the drill bit is particularly suitable for drilling a hole in the geological formation.

[0036] refer to figure 1 , which shows a drill bit, which includes a guide part 1, a lateral stabilization part 2, a lower reaming part 3 and a connecting shaft 4, wherein the connecting shaft 4 extends between the guiding part 1 and the lower reaming part 3 and rigidly connect the two parts. The guide portion 1 and the lower reamer portion 3 are provided with a cutter 5 . These knives 5 may be of any suitable type. Such drill bits can be used to drill holes in objects.

[0037] Typically, the lateral stabilizer 2 is provided to withstand lateral loads from the drilling system or from the drilling action of the pilot 1 and lower reamer 3 without cutting rock in the direction of the lateral load. There are various embodiments to ac...

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PUM

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Abstract

A drill bit having a central longitudinal axis and comprising a pilot (1) for drilling out a pilot diameter in a wellbore; an underreamer (3) located at a subsequent position of the pilot; connecting shaft (4), which extends between the guide part (1) and the lower reamer part (3); the stabilizing part (2), which is located between the guide part (1) and the lower reamer part (3), The stabilizing part fits in the guiding drilling part, and can keep the drill bit laterally stable while at least allowing the guiding part (1) to rotate.

Description

technical field [0001] The present invention relates to a drill bit for drilling a hole in an object, the drill bit extending generally about a central longitudinal axis, and to a system for drilling a hole in an object. Background technique [0002] US Patent No. 4,492,276 describes a drilling system using a known drill bit. The known drilling system includes an elongated rigid housing having a main central longitudinal axis to which a known drill bit having its own longitudinal axis is attached such that the axes of the drill bits are opposite Form a non-zero inclination angle with respect to the main central longitudinal axis. The drill bit is mounted within a support housing on the elongated housing. The elongated housing is provided with a mud motor that can drive the drill bit independently of the rotation of the drill string. The drill string stabilizer is provided at the top end of the elongated housing, and the support housing stabilizer is provided near or on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/06E21B10/26
CPCE21B7/062E21B7/067E21B7/068E21B10/26
Inventor 让-米歇尔·C·G·萨维尼亚D·H·齐伊斯林
Owner SHELL INT RES MAATSCHAPPIJ BV