CN113775323A - Self-adaptive pulsating hydraulic fracturing technology based on frequency spectrum resonance - Google Patents
Self-adaptive pulsating hydraulic fracturing technology based on frequency spectrum resonance Download PDFInfo
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- 238000002407 reforming Methods 0.000 claims description 2
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- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000003079 shale oil Substances 0.000 description 3
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/003—Vibrating earth formations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention discloses a self-adaptive pulsating hydraulic fracturing technology based on frequency spectrum resonance, which comprises the following steps: (1) inducing vibration of a target reservoir by high-voltage pulse discharge; (2) collecting and analyzing vibration signals; (3) obtaining numerical solutions of reservoir vibration states and pressure wave action ranges according to reservoir geological parameters and an underground energy transfer model: (4) measuring the natural frequency of a target reservoir based on theories such as adaptive modal empirical decomposition, neural residual shrinkage network algorithm and the like; (5) performing cooperative control on the monomer power and the group of the fracturing pump according to a closed-loop adaptive control strategy to generate a water shock wave with the pulsation frequency approximate to the natural frequency of a target reservoir; (6) the pulsating pressure wave acts on the reservoir and induces the reservoir to resonate, the mechanical energy injected into the reservoir is the largest, the joint structure tends to be unstable, the development area of the crack can be increased, and the oil-gas permeability is improved. The method takes pressure waves with the pulsation frequency equal to the natural frequency of a reservoir as an excitation source, realizes the hydraulic resonance fracturing of the oil and gas reservoir according to a closed-loop adaptive control strategy, and is an efficient oil and gas production increasing technology.
Description
Technical Field
The invention belongs to the field of oil and gas exploitation, and particularly relates to a method for improving physical properties of an oil and gas reservoir efficiently by self-adaptive pulsating hydraulic fracturing based on frequency spectrum resonance.
Background
The shortage problem of petroleum and natural gas in China will continue to accompany the development process of society, and new increase of oil and gas yield is urgently required to be sought in China. Unconventional oil and gas resources are limited by characteristics of low porosity, low permeability and the like of reservoirs, and need to be reformed to form industrial productivity. At present, shale oil and gas are mostly subjected to reservoir improvement through a hydraulic fracturing technology, and the fracturing mode of the shale oil and gas has higher hydrostatic pressure and can improve the area of a wide-area reservoir, so that the shale oil and gas is a more common and mature oil and gas yield increasing technology at present.
In recent years, many new reservoir modification techniques are emerging, including ultrasonic oil recovery techniques, plasma pulse resonance techniques, electrical pulse reservoir improvement techniques, waterless fracturing techniques, spectral resonance reservoir modification techniques, and the like. The principle of the excitation mechanism is that micro cracks are generated and communicated with cracks under the action of mechanical vibration no matter the excitation mechanism is plasma vibration, electric pulse vibration, ultrasonic vibration and the like. In the process, the conduction and attenuation of the vibration energy directly influence the reservoir transformation effect.
Researchers in the field of oil and gas development find resonance phenomena and characteristics thereof in other scientific research progress reports, namely, when a certain physical system is excited by the outside to vibrate at a resonance frequency, the amplitude of the vibration is larger than that of the vibration at any other frequency, and the researchers try to apply the resonance phenomena to the innovation research of oil and gas exploitation technology. In the application field of resonance technology, the key of the resonance rock breaking technology is how to accurately measure the natural frequency and accurately and quickly adjust the external excitation frequency according to the change of the natural frequency.
The invention combines the frequency spectrum resonance characteristic and the advantage of the hydraulic fracturing technology for the first time, the device automatically monitors the inherent frequency change of the reservoir and uses the inherent frequency change as the input value of the pressure pump set control system for regulating and controlling the pulsating pressure wave, the system belongs to closed loop feedback control, and the accurate output of the pressure wave can be realized so as to induce the reservoir to resonate, further promote the crack development and improve the oil-gas production rate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a self-adaptive pulsating hydraulic fracturing technology based on frequency spectrum resonance. A reservoir response state and a stress wave transmission model under external excitation are obtained on the basis of vibration signal analysis and wave dynamics theory in a research mode of combining theoretical identification, mathematical modeling and deep machine learning, the natural frequency of a target reservoir is determined by adopting self-adaptive complete empirical mode decomposition and a neural residual shrinkage network algorithm, and the self-adaptive adjustment of parameters of a fracturing pump set and an integral system is realized according to a nonlinear system robust control theory, so that the pulsation frequency of the generated hydraulic fracturing wave is equal to the natural frequency of the reservoir, the reservoir resonance is induced, the fracture development is promoted, and the oil and gas productivity is improved.
The technical scheme adopted by the invention is as follows: an adaptive pulsating hydraulic fracturing technique based on spectral resonance, comprising the following steps:
(1) inducing vibration of a target reservoir by high-voltage pulse discharge;
(2) collecting and analyzing vibration signals;
(3) obtaining a reservoir vibration state and a numerical solution of a stress wave effective reconstruction reservoir range according to reservoir geological parameters and a shock wave energy propagation model;
(4) measuring the natural frequency of a target reservoir based on theories such as self-adaptive complete modal empirical decomposition, neural residual shrinkage network algorithm and the like;
(5) carrying out single body power and group cooperative control of the fracturing pump according to a nonlinear system robust control theory, realizing internal self-adaptive adjustment of a pulsating water shock wave parameter control system, and generating a pulsating pressure wave with the frequency equal to the natural frequency of a target reservoir;
(6) the pulsating pressure wave acts on the reservoir and induces reservoir resonance;
(7) when the reservoir is in a resonance state, external excitation is injected into the reservoir to provide the largest mechanical energy for crack initiation of the cracks, the joint structure is easy to destabilize, the crack development area is effectively increased, and the oil-gas permeability is improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention combines the advantages of the frequency spectrum resonance and the pulse hydraulic fracturing technology for the first time at home and abroad, continuously induces the reservoir resonance, promotes the development of internal pores by the superposition of pressure waves, and realizes the yield increase from resonance to fracturing.
(2) The natural frequency of the oil and gas reservoir is directly related to the fracture network, so that the natural frequency is changed along with the transformation process.
(3) The method is suitable for various oil and gas resources, and has the advantages of wide applicability, high reliability, high energy efficiency ratio and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a flow chart of a self-adaptive pulsating hydraulic fracturing technique based on spectral resonance;
FIG. 2 is a schematic diagram of the working principle of an adaptive pulsating hydraulic fracturing technique based on spectral resonance;
in the figure: the system comprises a vibration response monitoring unit (1), a vibration signal analysis and natural frequency detection device (2), a fracturing pump set (3), a pulsating pressure wave output end (4), a target oil/gas reservoir (5) and a pulsating hydraulic fracturing self-adaptive control system (6).
Detailed Description
The embodiments of the present invention will now be described with reference to the conventional embodiments, and the advantages and effects of the present invention will be apparent to those skilled in the art from the description of the embodiments. The embodiments described are only a part of the embodiments of the present invention, and not all embodiments, so that all other embodiments obtained by persons skilled in the art without any inventive work are within the scope of the present invention.
As shown in FIG. 2, the invention provides a frequency spectrum resonance-based adaptive pulsating hydraulic fracturing technology workflow diagram, which comprises a vibration response monitoring unit (1) for inducing and detecting reservoir vibration, a vibration signal analysis and natural frequency detection device (2) for carrying out analysis on a vibration signal and measuring the natural frequency of a target reservoir, a measured natural frequency and related parameters are transmitted to a pulsating hydraulic fracturing adaptive control system (6) and are used for modulating the power distribution of a fracturing pump set (3) to realize accurate control of pressure wave physical parameters of a pulsating pressure wave output end (4), so that a target oil/gas reservoir (5) resonates, internal fracture development is promoted, and oil gas yield is improved.
Example 1
According to the working principle and thought, as shown in fig. 1 and fig. 2, the invention provides a frequency spectrum resonance-based adaptive pulsating hydraulic fracturing technical method, which comprises the following steps:
(1) inducing vibration of a target reservoir by high-voltage pulse discharge;
(2) collecting and analyzing vibration signals;
(3) obtaining a reservoir vibration state and a numerical solution of a stress wave effective reconstruction reservoir range according to reservoir geological parameters and a shock wave energy propagation model;
(4) measuring the natural frequency of a target reservoir based on theories such as self-adaptive complete modal empirical decomposition, neural residual shrinkage network algorithm and the like;
(5) and carrying out the cooperative control of the monomer power and the group of the fracturing pump according to the nonlinear system robust control theory, realizing the self-adaptive adjustment inside the pulsating water shock wave parameter control system, and generating pulsating pressure waves with the frequency equal to the natural frequency of the target reservoir.
(6) The pulsating pressure wave acts on the reservoir and induces reservoir resonance;
(7) when the reservoir is in a resonance state, external excitation is injected into the reservoir to provide the largest mechanical energy for crack initiation of the cracks, the joint structure is easy to destabilize, the crack development area is effectively increased, and the oil-gas permeability is improved.
Example 2
The structure of the present embodiment is substantially the same as that of embodiment 1, except that in the steps (5) and (6), the pressure wave, parameters related to the fracturing pump and the response state of the oil/gas reservoir in the excitation state are used as the input of step 2 for the internal parameter correction of the adaptive control system, so as to ensure the generation of accurate and stable pulsating pressure wave.
Example 3
The structure of the embodiment is basically the same as that of the embodiment 1, and the difference is that the pulse hydraulic fracturing technology based on the frequency spectrum resonance is a detection-control-application integrated self-adaptive cooperative control system, so that the self-adjustment of internal parameters of the system is realized after the high-voltage pulse discharge induces the vibration of a target reservoir, the artificial error and the time delay are reduced, and the purpose of precisely reforming the reservoir through resonance is achieved.
The above embodiments are merely exemplary embodiments of the present invention, which are not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.
Claims (4)
1. A self-adaptive pulsating hydraulic fracturing technology based on frequency spectrum resonance is characterized in that: the method comprises the following steps:
(1) inducing vibration of a target reservoir by high-voltage pulse discharge;
(2) collecting and analyzing vibration signals;
(3) obtaining a reservoir vibration state and a numerical solution of a stress wave effective reconstruction reservoir range according to reservoir geological parameters and a shock wave energy propagation model;
(4) measuring the natural frequency of a target reservoir based on theories such as self-adaptive complete modal empirical decomposition, neural residual shrinkage network algorithm and the like;
(5) carrying out single body power and group cooperative control of the fracturing pump according to a nonlinear system robust control theory, realizing internal self-adaptive adjustment of a pulsating water shock wave parameter control system, and generating a pulsating pressure wave with the frequency equal to the natural frequency of a target reservoir;
(6) the pulsating pressure wave acts on the reservoir and induces reservoir resonance;
(7) when the reservoir is in a resonance state, external excitation is injected into the reservoir to provide the largest mechanical energy for crack initiation of the cracks, the joint structure is easy to destabilize, the crack development area is effectively increased, and the oil-gas permeability is improved.
2. The adaptive pulsating hydraulic fracturing technique based on spectral resonance as claimed in claim 1, wherein in step (5), the pulsating pressure wave and the values of parameters related to the fracturing pump are used as the input of step (2) for the internal parameter modification of the adaptive control system, so as to ensure the generation of precise and stable pulsating pressure wave.
3. The adaptive pulsating hydraulic fracturing technology based on spectral resonance as claimed in claim 1, wherein in step (6), the step (2) is repeated to perform reservoir vibration state detection and analysis for adaptive control system internal parameter modification, aiming to ensure generation of precise and stable pulsating pressure wave.
4. The self-adaptive pulsating hydraulic fracturing technology based on spectral resonance as claimed in claim 1, wherein the fracturing technology is a detection-control-application integrated self-adaptive cooperative control system, so as to realize self-adjustment of internal parameters of the system, reduce artificial errors and time delay and achieve the purpose of precisely reforming a reservoir by resonance.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114239656A (en) * | 2021-12-17 | 2022-03-25 | 中国石油大学(北京) | Underground event positioning method and device based on pump stopping pressure signal |
| CN114607321A (en) * | 2022-03-28 | 2022-06-10 | 重庆大学 | Coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and method |
| CN115628038A (en) * | 2022-10-31 | 2023-01-20 | 中国矿业大学 | Mine self-adjusting pulse fracturing method based on acoustic wave remote detection |
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| CN114607321A (en) * | 2022-03-28 | 2022-06-10 | 重庆大学 | Coal seam water injection and multi-frequency ultrasonic circulation segmented permeability-increasing extraction device and method |
| CN115628038A (en) * | 2022-10-31 | 2023-01-20 | 中国矿业大学 | Mine self-adjusting pulse fracturing method based on acoustic wave remote detection |
| CN115628038B (en) * | 2022-10-31 | 2024-05-17 | 中国矿业大学 | Mine self-adjusting pulse fracturing method based on acoustic wave remote detection |
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