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Fluid drilling head nozzle design

A technology of nozzles and fluids, which is applied in the direction of drill bits, drilling equipment, drilling with liquid/gas jets, etc., and can solve problems such as difficulties in the effective design of fluid cutting heads, etc.

Inactive Publication Date: 2013-12-04
CMTE DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, arranging such nozzles to produce a smooth and self-advancing geometry is very difficult due to the dead zone directly in front of the pilot jet at the leading edge of the fluid cutting head, and due to the physical size of the horn nozzle, Efficient design of fluid cutting heads is also difficult

Method used

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  • Fluid drilling head nozzle design
  • Fluid drilling head nozzle design
  • Fluid drilling head nozzle design

Examples

Experimental program
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Embodiment Construction

[0016] In a preferred form of the invention, the fluid drill bit 8 generally has a rotatable nozzle assembly 9 and may contain other features such as a gauging ring 10 mounted on the front end of the drill body 11 .

[0017] The following will refer to Figure 3 to Figure 7 describing a more detailed construction of the rotatable nozzle assembly 9, Figure 3 to Figure 7 shows how nozzle design and placement can be optimized to overcome the figure 2 Problems with fluid drills of the type typical of the prior art shown at 12 in .

[0018] In a typical fluid drill bit in the prior art, the rotatable nozzle assembly 13 is provided with a pilot nozzle 14 and a reamer nozzle 15, which are usually of the "horn nozzle" type with a tapered exit portion. design. This type of nozzle produces an intense cavitation cloud, shown diagrammatically at 16, which effectively cuts and fragments the rock. It has been found through careful laboratory testing that although the cavitation clouds ...

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PUM

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Abstract

A fluid cutting head of the type having a plurality of nozzles in a rotatable nozzle assembly for cutting a bore hole in rock. The cutting head has nozzles arranged to be supplied with high pressure drilling fluid, forming jets positioned to cut adjacent rock. The nozzles include one or more generally axially facing pilot nozzles, and one or more generally radially facing reaming nozzles. At least the pilot nozzles include a non-tapering outlet section such that the jet issuing therefrom is of substantially constant cross-section in a zone immediately adjacent the outlet section. The pilot nozzles are located in a leading part of the rotatable nozzle assembly, and have a minimized diameter. The reaming nozzles are located in the following part of the rotatable nozzle assembly. The following part of the rotatable nozzle assembly is formed in a step-wise fashion to keep the reaming nozzles close to the rock face.

Description

[0001] The present invention relates to the design of a nozzle and rotatable nozzle assembly for a fluid drill bit having the characteristics generally described in our earlier International Patent Application PCT / AU02 / 01550 (International Publication No. WO 03 / 042491A1) type, the content of this International Patent Application is hereby incorporated by cross-reference. Background technique [0002] In previously known forms of fluid drill bits, nozzles of the type known as "horn nozzles" having a powerful cavity designed to cut or break rock during drilling operations have been commonly used. The diverging exit portion of the bubble cloud. Attached to this manual figure 2 Such a device is shown in . [0003] Further research by the applicant has shown that although the cavitation cloud produced by this type of horn nozzle is indeed intense, it is produced at a location remote from the nozzle exit. The area between the cavitation cloud and the nozzle exit is the "dead zone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/18E21B10/60
CPCE21B10/60E21B7/18E21B10/61
Inventor 斯科特·克里斯托弗·亚当大卫·巴利彼特·劳格
Owner CMTE DEV LTD