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Waterpower pulse cavitation jet well drilling device, method and drill bit

A hydraulic pulse and jet technology, which is applied in the direction of liquid/gas jet drilling, drill bits, drilling equipment, etc., can solve the problems of poor hydraulic pulse effect, decreased hydraulic energy of the drill bit, and increased confining pressure, etc., achieving broad application prospects and Development potential, good economic and social benefits, and the effect of prolonging the service life

Inactive Publication Date: 2008-01-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The life of the simple pulse nozzle has certain limitations in the field, and with the increase of the well depth, the hydraulic energy of the drill bit decreases, the confining pressure increases, the cavitation capacity is correspondingly weakened, and the jet impact effect is significantly reduced; the downhole hydraulic propulsion depends on the tool piston. The hydraulic pulse effect is not good when drilling pressure is generated; the negative pressure pulse effect of the hydraulic pulse circulation valve is good, but the disadvantage is that the structure is complex, and the solid phase particles contained in the drilling fluid are easy to cause wear on the internal parts of the modulator

Method used

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  • Waterpower pulse cavitation jet well drilling device, method and drill bit
  • Waterpower pulse cavitation jet well drilling device, method and drill bit
  • Waterpower pulse cavitation jet well drilling device, method and drill bit

Examples

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Effect test

Embodiment 1

[0039] FIG. 1 is a flow chart of Embodiment 1 of the method of the present invention. The specific steps of the hydraulic pulse cavitation jet drilling method are as follows:

[0040] Step 101 : during drilling operations, converting the continuous and stable liquid flow used to impact the bottom of the well into a pulsed resonance flow liquid;

[0041] Step 102: injecting the pulse resonant flowing liquid into a relatively static liquid at a high speed to generate a cavitation phenomenon;

[0042] Step 103 : shock the pulsed resonance flowing liquid that generates cavitation to the bottom of the well in the manner of fluctuating pressure.

[0043] In the above preferred embodiment, the pulsed liquid flow can be generated by periodically perturbing the continuous and stable liquid flow according to a preset frequency.

[0044]In the above embodiment, the continuous fluid passes through the resonant cavity to form an acoustic resonance, so that the jet at the nozzle outlet be...

Embodiment 2

[0047] This embodiment is a flow of a more detailed solution than Embodiment 1. details as follows:

[0048] Step 1010: during the drilling operation, convert the continuous and stable liquid flow for impacting the bottom of the well into a pulsed resonance flow liquid; periodically perturb the continuous and stable liquid flow according to a preset frequency;

[0049] Step 1021: The resonant cavity of the organ pipe can form an acoustic resonance, so that the jet at the nozzle outlet becomes a discontinuous vortex circulation, which induces the occurrence of cavitation;

[0050] In step 1022, the rotating impeller can disturb the continuous fluid and enhance the discontinuity of the fluid, thereby enhancing cavitation;

[0051] Step 1031: causing the pressure of the pulse resonance flowing liquid to fluctuate;

[0052] Step 1032: generating feedback pressure resonance in the pulse resonance flowing liquid with pressure fluctuations;

[0053] Step 1033: use the pressure res...

Embodiment 3

[0058] When this embodiment is assembled and used according to Figure 13, the specific steps are as follows:

[0059] Step 201, during the drilling operation of the drilling tool, introduce a continuous and stable liquid flow for impacting the bottom of the well;

[0060] Step 202: Periodically disturb the continuous and stable liquid flow to form a pulsed flow liquid, so as to increase the impact effect;

[0061] Step 203: Amplify the liquid in pulsed flow and make it resonate, and then convert it into a liquid in pulsed resonance flow;

[0062] Step 204, by reducing the cross-sectional area of ​​the fluid and accelerating its flow rate, so that it is injected into the relatively static ambient liquid at a high speed;

[0063] Step 205, making the liquid form a turbulent vortex to generate a cavitation phenomenon;

[0064] Step 206 , flowing the high-speed pulsed resonant flowing liquid that produces cavitation into the organ pipe nozzle on the drill bit in the form of fluc...

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Abstract

The invention discloses a hydraulic pulse drilling device with cavitation jet, which comprises a columnar body, wherein a fluid inlet section is provided at one end of the body, a fluid outlet section is provided at the other end of the body, and a fluid diversion portion for deviating the flow direction of the fluid, a pulse generator allowing the continuous fluid to generate pulse and a self-oscillation portion for allowing the fluid with pulse to generate resonance oscillation are sequentially provided between the fluid inlet section and fluid outlet section. The invention also discloses a self-resonating cavitation jet nozzle for drilling head, which improves the rock breaking effect of drilling head and rock cleaning effect at well bottom. The invention also discloses a hydraulic pulse drilling method with cavitation jet, which comprises during drilling work, converting continuous and stable fluid flow for impacting well bottom to pulse resonance flowing fluid; and injecting the pulse resonance flowing fluid into relatively static fluid to generate cavitation phenomena. The impact of well bottom with oscillating pressure reduces clip hold down effect, improves the rock cleaning and rock breaking capacity by jetting, and saves drilling cost.

Description

technical field [0001] The present invention relates to a new device and method for drilling downhole, in particular to a hydraulic pulse cavitation jet drilling device and method, and a drill bit that can be used with the device. Background technique [0002] The object of drilling and production technology is downhole system (from wellbore to formation). This kind of object is characterized by small wellbore, deep formation, complex downhole conditions, and invisible. Only downhole drilling and production tools can be closest to the working object. Therefore, in order to use the new drilling and production technology to perform fine operations on the downhole system, only downhole drilling and production tools are required. The need to develop advanced drilling and production technology has led to the emergence of new downhole drilling and production tools, and the implementation of new drilling and production technology must also rely on downhole drilling and production ...

Claims

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Application Information

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IPC IPC(8): E21B7/18E21B10/60
Inventor 李根生牛继磊黄中伟史怀忠
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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