Rotary impact shock jet PDC (polycrystalline diamond compact) bit

A jet-type and drill bit technology, which is applied in the direction of drill bit, liquid/gas jet drilling, and rotary combined drilling driving device, etc., can solve the problems of cuttings starting and suspension under the drill bit, etc., so as to improve drilling efficiency and improve drilling efficiency. Flow field distribution, the effect of avoiding mud bag

Pending Publication Date: 2018-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design of the nozzle increases the speed of cuttings upward return, which is beneficial to discharge the cuttings suspended in the drilling fluid to the surface in time, but it is less helpful for the starting and suspension of cuttings under the drill bit

Method used

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  • Rotary impact shock jet PDC (polycrystalline diamond compact) bit
  • Rotary impact shock jet PDC (polycrystalline diamond compact) bit
  • Rotary impact shock jet PDC (polycrystalline diamond compact) bit

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 , figure 2 As shown, the rotary percussion oscillating jet type PDC drill bit described in this embodiment has a main body including three parts: the indenter I, the single control channel monostable jet element II and the bit body III. Two blind holes are respectively opened in the drill body III, wherein the left blind hole 9 is located under the large outlet 8 of the jet element, and communicates with two large nozzles 11, while the right blind hole 10 is located under the small outlet 7 of the jet element, It is connected with two small nozzles 12; there is a central channel 1 connected to the nozzle 2 of the single-control channel monostable jet element inside the pressure head I; the single-control channel monostable jet element II is a complete rectangular block, passing through the block The required flow channel is pr...

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PUM

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Abstract

The invention relates to a rotary percussion oscillating jet type PDC drill bit, which comprises a drill body body, a pressure head, a single control channel monostable jet element and a plurality of flow channels arranged inside the element, the pressure head and the drill body. The pressure head seals the single-control channel monostable jet element in the drill body, and welds the single control channel monostable jet element at the lower end and the peripheral drill body into a whole. Nozzles with different diameters are arranged at the outlets of the common flow channels in the drill body. The asymmetric design of the monostable jet element with a single control channel enables the jet flow passing through the inlet of the jet element to stabilize the wall to the side connected to the large diameter nozzle. When the hammer hits the drill bit, the control channel is blocked by the hammer, so that the fluid medium entering the jet element suddenly switches to the side of the small nozzle, the internal pressure of the drill increases sharply and generates an instantaneous pulse jet powerfully flushing the bottom of the hole. The invention periodically generates High-frequency pulsed water jet can effectively reduce the difficulty of starting cuttings at the bottom of deep holes, improve the distribution of flow field at the bottom of the hole, and improve the removal effect of cuttings.

Description

technical field [0001] The invention relates to a drilling tool, in particular to an oscillating jet PDC drill bit combined with a rotary percussion drilling process. Background technique [0002] The rotary percussion drilling method, which is mainly rotary and supplemented by impact, has a good effect on rocks with strong abrasiveness and strong plasticity. During the drilling process, in order to prevent a large amount of cuttings from accumulating and causing balling or premature wear of the roller cone bit or PDC bit, the nozzle of the bit needs to be carefully considered in the design. Especially for deep drilling, the holding effect caused by the large hydrostatic column pressure often makes it difficult to remove cuttings at the bottom of the hole, resulting in a decrease in drilling efficiency. [0003] The publication number is CN203559791U. The present invention discloses a negative pressure upward return nozzle drill bit at the bottom of a well. By changing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/24E21B7/18E21B6/00E21B10/46E21B10/61
CPCE21B7/24E21B6/00E21B7/18E21B10/46E21B10/61
Inventor 吴冬宇张绍和曹函孙平贺舒彪张鑫鑫
Owner CENT SOUTH UNIV
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