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Waterpower pulse cavitation jet well drilling device and drill bit

A hydraulic pulse and cavitation 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, reduced hydraulic energy of the drill bit, and reduced jet impact effect, etc., achieving broad application prospects and development potential, good economic and social benefits, and the effect of increasing the ROP

Inactive Publication Date: 2010-05-12
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 and drill bit
  • Waterpower pulse cavitation jet well drilling device and drill bit
  • Waterpower pulse cavitation jet well drilling device and drill bit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 1 It is a flow chart of Embodiment 1 of the method of the present invention. The specific steps of the method for hydraulic pulse cavitation jet drilling are as follows:

[0036] Step 101: During the drilling operation, converting the continuous and steady liquid flow used for impacting the bottom of the well into a pulsed resonance flow liquid;

[0037] Step 102: Injecting the pulse resonance flowing liquid into a relatively static liquid at high speed to generate cavitation;

[0038] Step 103: Impacting the pulsed resonance flow liquid that generates cavitation to the bottom of the well in the form of fluctuating pressure.

[0039] In the above preferred embodiment, the pulsating liquid flow can be generated by periodically disturbing the continuous and stable liquid flow according to a preset frequency.

[0040] In the above embodiment, the continuous fluid passes through the resonant cavity to form acoustic resonance, so that the jet flow at the outlet of ...

Embodiment 2

[0043] This embodiment is a process flow of a more detailed solution than that of Embodiment 1. details as follows:

[0044] Step 1010: During the drilling operation, converting the continuous and stable liquid flow used for impacting the bottom of the well into a pulse resonance flowing liquid; periodically disturbing the continuous and stable liquid flow according to a preset frequency;

[0045] Step 1021: the organ pipe resonant cavity can form acoustic resonance, so that the jet flow at the outlet of the nozzle becomes intermittent vortex circulation, and cavitation is induced;

[0046] Step 1022, the rotating impeller can generate disturbance to the continuous fluid, enhance the discontinuity of the fluid, thereby enhancing the cavitation;

[0047] Step 1031: fluctuate the pressure of the pulse resonance flowing liquid;

[0048] Step 1032: Make the pulsed resonant flow liquid with pressure fluctuations generate feedback pressure resonance;

[0049] Step 1033: Using the p...

Embodiment 3

[0054] This example is based on Figure 13 When assembling and using, the specific steps are as follows:

[0055] Step 201, during the drilling operation of the drilling tool, introducing a continuous and stable liquid flow for impacting the bottom of the well;

[0056] Step 202, periodically disturbing the continuous and stable liquid flow to form a pulsed flow liquid to increase the impact effect;

[0057] Step 203, amplifying the pulsating liquid and causing it to resonate, thus transforming it into a pulsating resonant flowing liquid;

[0058] Step 204, by reducing the cross-sectional area of ​​the fluid and accelerating its flow velocity, injecting it into the relatively static ambient liquid at high speed;

[0059] Step 205, making the liquid form a turbulent vortex to generate cavitation;

[0060] Step 206, flowing the high-speed pulse resonant flow liquid that produces cavitation into the organ pipe nozzle on the drill bit in the form of fluctuating pressure;

[00...

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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 sectionis 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 aself-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 invention relates to a new downhole drilling device and a drill bit, in particular to a hydraulic pulse cavitation jet drilling device and a drill bit which can be used in conjunction with the device. Background technique [0002] The object of drilling and production technology is the downhole system (from the wellbore to the formation). This kind of object is characterized by small borehole, deep formation, complex downhole conditions, and invisible. Only downhole drilling tools can be closest to the working object. Therefore, if you want to use the new drilling and production technology to perform fine operations on the downhole system, you can only rely on downhole drilling and production tools. The demand for the development of advanced drilling and production technology has triggered the emergence of new downhole drilling and production tools, and the implementation of new drilling and production technology must also rely on downhole drillin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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