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Hydraulic pulse cavitation jet well drilling method

A hydraulic pulse and jet technology, used in drilling with liquid/gas jets, etc., can solve the problems of increased confining pressure, decreased jet impact effect, and weakened cavitation capability, and can extend service life, ensure downhole safety, and improve mechanical properties. The effect of drilling speed

Active Publication Date: 2012-11-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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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  • Hydraulic pulse cavitation jet well drilling method
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  • Hydraulic pulse cavitation jet well drilling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1 This is a flowchart 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 the drilling operation, the continuous and stable liquid flow used for impacting the bottom of the well is converted into a pulsed resonance flow liquid;

[0041] Step 102: Inject the pulsed resonance flowing liquid into a relatively static liquid at a high speed to cause cavitation;

[0042] Step 103: Impulse the pulse resonance flowing liquid that produces cavitation into the bottom of the well in a fluctuating pressure manner.

[0043] In the above preferred embodiment, the pulsating flow of the liquid can be generated by periodic disturbance of the continuous and stable liquid flow according to a preset frequency.

[0044] In the above embodiment, the continuous fluid forms acoustic resonance through the resonant cavity, so that the jet at the nozzle outlet becomes an intermitt...

Embodiment 2

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

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

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

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

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

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

[0053] Step 1033: Use the pressure resonance to generate fluid ...

Embodiment 3

[0058] This example is based on Figure 13 When assembling and using, the specific steps are as follows:

[0059] Step 201: Introduce a continuous and stable liquid flow for impacting the bottom of the hole during the drilling operation of the drilling tool;

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

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

[0062] Step 204: By reducing the cross-sectional area of ​​the fluid and speeding up its flow rate, it is injected into the relatively static environmental liquid at a high speed;

[0063] Step 205: Make the liquid form a turbulence to generate cavitation;

[0064] Step 206: Flow the high-speed pulse resonant flowing liquid that generates the cavitation phenomenon into the organ tube nozzle on the drill bit in a fluctuating pressure manner;

[0065] Step 207: The ca...

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Abstract

The invention discloses a hydraulic pulse cavitation jet well drilling method comprising the following steps: in well drilling operation, converting continuously stable liquid flow used for shocking bottom hole into pulse resonance oscillation flowing liquid; jetting pulse resonance oscillation flowing liquid into relatively still liquid at high speed to generate a cavitation phenomenon; shockingthe bottom hole in the mode of fluctuating pressure so as to reduce chip hold down effect, improve the capability of cleaning and breaking rock by jetting flow and save well drilling cost.

Description

[0001] This application is a divisional application of the patent application submitted to the Patent Office on July 12, 2006, the application number is 200610098598.8, and the title of the invention is "Hydraulic Pulse Cavitation Jet Drilling Device, Method and Drill Bit". technical field [0002] The invention relates to a drilling method, in particular to a hydraulic pulse cavitation jet drilling method. Background technique [0003] 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 te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/18
Inventor 李根生牛继磊黄中伟史怀忠
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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