CN115217457A - Resonant pulse pressure wave fracturing method and system with same frequency as target layer - Google Patents
Resonant pulse pressure wave fracturing method and system with same frequency as target layer Download PDFInfo
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Abstract
The invention provides a resonant pulse pressure wave fracturing method and system with the same frequency as a target zone, and belongs to the field of oil and gas reservoir development. According to the method, the combination of viscosity and discharge capacity of the fracturing fluid is changed, so that the frequency of the pressure pulse wave generated by the fracturing fluid is matched with the inherent frequency of the reservoir at the target interval, the resonance effect is further exerted, and the complexity and the modification volume of the reservoir fracture are improved. According to the invention, by changing the combination and change of the viscosity and the discharge capacity of the fracturing fluid, pressure waves with different frequencies are generated, so that the frequency of the pressure pulse wave is matched with the target reservoir stratum, the resonance effect is exerted, and the complexity and the modification volume of the reservoir stratum fracture are improved to the maximum extent.
Description
Technical Field
The invention belongs to the field of oil and gas reservoir development, and particularly relates to a resonant pulse pressure wave fracturing method and system with the same frequency as a target zone.
Background
At present, the hydraulic fracturing technology, particularly the staged fracturing technology of a horizontal well, is widely applied to oil and gas reservoirs of different types and production stages and has a remarkable effect. Although a volume fracturing technology aiming at improving the complexity and the modification volume of the fracture to the maximum extent is further provided at present, the volume fracturing technology plays an important role in the exploration and development practice of shale oil and gas reservoirs. However, through comprehensive balance analysis by means of microseism monitoring technology, G function analysis and the like, the complexity degree of the crack still has room for further improvement. Even for the Chongqing Fuling shale gas with relatively good development effect, the proportion of single cracks is still up to more than 40%.
Chinese patent publication (CN 110785538 a) discloses a plasma pulse hydraulic fracturing system using carbonaceous slurry. The system comprises a hydraulic pumping unit and a plasma pulse tool. The pulse unit may pump hydraulic fracturing fluid to a corresponding downhole location in the reservoir. A fracture may be initiated at the location using a pumping unit and a plasma pulse delivered to the downhole location using a plasma pulse tool already disposed at the location, which may in turn increase the hydraulic pressure of the fracturing fluid.
Chinese patent publication (CN 207315333U) discloses a high-energy multi-pulse perforation fracturing device, which mainly comprises a pressurizing device, a sleeve, an oil pipe and a perforating gun, wherein the sleeve is positioned on the outer side of the oil pipe, the pressurizing device pressurizes the sleeve through a sealed pipeline, the perforating gun is in hard connection with the tail of the oil pipe, the perforating gun comprises a pressure recorder, a pressure detonator, a detonating cord, a safety gun, a perforating bullet frame, a perforating bullet, fracturing gunpowder and a gun tail, the pressure recorder is positioned on the upper part of the perforating gun, the safety gun is positioned below the pressure detonator, the detonating cord is arranged inside the safety gun and is connected with the pressure detonator, the perforating bullet frame is positioned below the safety gun, and the perforating bullet and the fracturing gunpowder are positioned on the perforating bullet frame. The pressure can be accurately controlled, the propping agent can effectively prop the crack, the yield is high, and the use is safe.
Chinese patent publication (CN 109446706A) discloses a method for determining laying form of pulse fiber sand fracturing proppant clusters, which comprises the following steps: 1) Determining the geometrical structure parameters of the hydraulic fracture; 2) Measuring rheological parameters of the fracturing fluid and the fiber fracturing fluid, and correcting to obtain the rheological parameters of the mixed solution of the fracturing fluid, the fibers and the proppant; 3) Establishing a hydraulic fracture geometric model, outputting a data file in an iges format, performing flow field calculation domain grid division, and outputting a grid file in an msh format; 4) Respectively treating fracturing fluid and a mixed solution of the fracturing fluid, fiber and a propping agent which are alternately injected by pulses as two continuous fluid phases, and establishing a CFD model with the two phases flowing in a fracture;
5) Simulating the flow of fracturing fluid and mixed liquid injected into the hydraulic fracture in a pulse mode to obtain the laying form of the proppant clusters. The method can quantitatively describe the laying form of the proppant clusters in the fracture, and provides technical support and theoretical basis for researching the yield increase mechanism of pulse fiber sand fracturing and optimizing construction parameters.
Chinese patent publication (CN 209838387U) discloses a pulse type sand-adding fracturing control device, wherein an inlet of a sand-carrying fluid injection cylinder is communicated with an outlet of a sand mixing tank through a sand mixing tank fluid supply pipeline, a sand mixing tank fluid supply pump is arranged on the sand mixing tank fluid supply pipeline, a first flow meter for measuring the flow rate of the sand mixing tank is arranged on the sand mixing tank fluid supply pump, an inlet of a raw glue fluid injection cylinder is communicated with an outlet of a raw glue fluid storage tank through a raw glue fluid supply pipeline, a raw glue fluid supply pump is arranged on the raw glue fluid supply pipeline, a second flow meter for measuring the flow rate of the raw glue fluid is arranged on the raw glue fluid supply pump, an outlet of the sand-carrying fluid injection cylinder and an outlet of the raw glue fluid injection cylinder are respectively communicated with an inlet of a discharge cylinder, an outlet of the discharge cylinder is communicated with an inlet of a fracturing ground low-pressure manifold, and a fracturing truck set fracturing pump is arranged on the fracturing ground low-pressure manifold.
None of the above patents relate to a technique for stimulation by fracturing using resonant pulsed pressure waves of the same frequency of the reservoir.
Although the existing hydraulic fracturing technology has a certain effect on unconventional reservoir transformation, the problems that the proportion of single fractures is high, the fracture complexity is required to be further improved and the like are still faced in the application process. At present, the technologies adopted in the aspects of improving the complexity of cracks and reforming the volume mainly take measures such as dense cutting, variable viscosity, variable displacement, temporary plugging and the like. For marine-phase shale oil gas with good brittleness, close cutting can ensure the fracture forming capability of each cluster of fractures, but for continental-phase shale oil gas fracturing with high clay content, close cutting inevitably brings about reduction of the width and the height of each cluster of fractures, so that the reconstruction of the fractures in the section cannot increase along with the increase of the number of perforation clusters; temporary plugging measures cannot accurately position the temporary plugging position, and for deep shale gas, due to the fact that the width of a crack is greatly reduced, temporary plugging agents can be accumulated in a crack zone close to a well, so that the construction pressure is uncontrollably and rapidly increased, and the crack complex place after temporary plugging only appears at the crack position close to the well; conventional variable viscosity and variable displacement measures, lack of basis for determining viscosity ratio and displacement ratio, and their effectiveness is questionable, especially for fracturing of reservoirs with large stress differences between two phases. Therefore, the reconstruction measures have respective use limits, and corresponding use geological conditions and measure effectiveness need to be further clarified.
Therefore, research is needed to provide a new fracturing technology to solve the limitations of the different technologies.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a resonant pulse pressure wave fracturing method and a resonant pulse pressure wave fracturing system with the same frequency as a target layer.
The invention is realized by the following technical scheme:
according to the method, the combination of viscosity and discharge capacity of fracturing fluid is changed, so that the frequency of pressure pulse waves generated by the fracturing fluid is matched with the inherent frequency of a reservoir stratum of a target stratum, a resonance effect is further exerted, and the complexity and the reconstruction volume of a reservoir stratum fracture are improved.
A further development of the invention is that the method comprises:
the method comprises the following steps: acquiring the natural frequency of a reservoir of a target interval;
step two: determining a viscosity and displacement combination matched with the natural frequency of the reservoir in the target interval;
step three: checking the strength of the sleeve, and determining the sleeve suitable for the matched viscosity and displacement combination;
step four: performing on-site fracturing by using the sleeve determined in the third step and the matched viscosity and displacement combination determined in the second step;
step five: and finishing the subsequent construction.
In a further development of the invention, the operation of step one comprises:
and testing the collected core of the reservoir of the target interval by using the core natural frequency testing device to obtain the natural frequency of the reservoir of the target interval.
The invention is further improved in that the operation of the second step comprises:
(21) Setting N groups of different viscosity and discharge volume combinations;
(22) Respectively carrying out pressure pulse frequency test on each group of viscosity and displacement combination to obtain pressure pulse frequencies under different viscosity and displacement combinations;
(23) And respectively judging whether the error between the pressure pulse frequency under each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a threshold value, if so, judging that the viscosity and displacement combination of the group is matched with the natural frequency of the reservoir of the target interval.
A further development of the invention is that the threshold value is 10%.
The invention is further improved in that the fracturing construction is carried out in a spiral type alternative variable displacement mode in the fourth step.
In a second aspect of the invention, there is provided a resonant pulsed pressure wave fracturing system having the same frequency as a target formation, the system comprising:
the natural frequency acquisition unit is used for acquiring the natural frequency of the reservoir of the target interval;
the viscosity and displacement combination confirmation unit is connected with the natural frequency acquisition unit and is used for determining the viscosity and displacement combination matched with the natural frequency of the reservoir of the target interval;
the sleeve checking unit is connected with the viscosity and discharge combination confirming unit and used for checking the strength of the sleeve and determining the sleeve suitable for the matched viscosity and discharge combination;
the fracturing unit is respectively connected with the viscosity and discharge capacity combination confirmation unit and the sleeve checking unit and is used for performing on-site fracturing by utilizing the sleeve determined by the sleeve checking unit and the viscosity and discharge capacity combination which is matched with the viscosity and discharge capacity combination determined by the viscosity and discharge capacity combination confirmation unit;
and the follow-up construction unit is connected with the fracturing unit and is used for finishing follow-up construction.
The invention further improves that the natural frequency acquisition unit comprises a core natural frequency testing device.
In a further development of the invention, the combined viscosity and displacement determining unit comprises:
the setting subunit is used for setting N groups of different viscosity and displacement combinations;
the testing subunit is connected with the setting subunit and is used for respectively testing the pressure pulse frequency of each group of viscosity and displacement combination to obtain the pressure pulse frequency under different viscosity and displacement combinations;
and the judging subunit is connected with the testing subunit and is used for respectively judging whether the error between the pressure pulse frequency under each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a threshold value, and if so, judging that the group of viscosity and displacement combination is matched with the natural frequency of the reservoir of the target interval.
In a third aspect of the present invention, there is provided a computer-readable storage medium storing at least one program executable by a computer, the at least one program, when executed by the computer, causing the computer to perform the steps in the method for resonant pulsed pressure wave fracturing at the same frequency as a target layer.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by changing the combination and change of the viscosity and the discharge capacity of the fracturing fluid, pressure waves with different frequencies are generated, so that the frequency of the pressure pulse wave is matched with the target reservoir stratum, the resonance effect is exerted, and the complexity and the modification volume of the reservoir stratum fracture are improved to the maximum extent.
Drawings
FIG. 1 is a block diagram of the steps of the method of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the resonant pulse pressure wave fracturing method with the same frequency as the target reservoir stratum utilizes the inherent frequency of the target reservoir stratum, and generates pressure pulse waves with different frequencies by changing the viscosity and displacement combination of the fracturing fluid, so that the frequency of the pressure pulse waves is equal to (namely matched with) the target reservoir stratum, the resonance effect is further exerted, and the complexity and the reconstruction volume of reservoir stratum fractures are improved to the maximum extent.
The invention adopts the equal-frequency pressure pulse wave fracturing technology with the same natural frequency as the target reservoir, and the concrete implementation measure is the combination of variable viscosity and variable displacement. In general, the combination of variable viscosity and variable displacement can produce a certain pressure pulse effect. However, the conventional pressure pulse fracturing technology has no specific requirement on frequency, so that even if the complexity of forming the fracture is helped to a certain extent, the targeted optimization target is lacked, and the blindness of measures is relatively large. The invention proposes an optimization target of the frequency of the pressure pulse wave, namely, the frequency is equal to the natural frequency of a target reservoir. At the moment, a resonance effect is generated, and the complexity and the modification volume of reservoir fractures are improved to the maximum extent.
Meanwhile, the variable viscosity and the variable displacement under the set pressure pulse frequency (the natural frequency of the target reservoir rock) are optimized. The combination and variation of viscosity and displacement produces pressure waves of different frequencies. Pressure gauges can be additionally arranged at the inlet and the outlet of the indoor opaque parallel plate physical simulation device respectively, and the pressure wave frequencies under different viscosity and displacement combinations are observed and recorded. Only one parameter is changed, the pressure pulse frequency is observed and recorded, and if the frequency requirement can be met only by changing a certain parameter (a threshold value can be set, for example, the frequency requirement can be met when the error of the natural frequency of a target layer is less than 10%), construction can be carried out according to the requirement. If the frequency requirement is not met, the viscosity and displacement combination is readjusted until the frequency requirement is met. The method can also be used for additionally installing a pressure gauge at the bottom of the actual construction well, retrieving pressure gauge playback data after fracturing construction, observing whether pressure frequency and pressure numerical value change meet design requirements or not according to the pressure playback data, if the pressure frequency does not meet the design requirements, adjusting pump injection frequency change and time interval during construction, if the pressure numerical value does not meet the requirements, properly increasing the discharge capacity, and if the discharge capacity cannot meet the requirements of the pressure numerical value through adjustment, adjusting the viscosity of the fracturing fluid until the pressure numerical value meets the requirements.
As shown in fig. 1, the method of the present invention comprises:
the method comprises the following steps: acquiring the natural frequency of the reservoir of the target interval: testing the collected core of the reservoir of the target interval by using a core natural frequency testing device to obtain the natural frequency of the reservoir of the target interval;
step two: determining a viscosity and displacement combination matched with the natural frequency of the reservoir of the target interval:
the method specifically comprises the following steps:
(21) Setting N groups of different viscosity and displacement combinations;
(22) Respectively carrying out pressure pulse frequency test on each group of viscosity and displacement combination to obtain pressure pulse frequencies under different viscosity and displacement combinations;
(23) And respectively judging whether the error between the pressure pulse frequency of each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a set threshold value, if so, judging that the group of viscosity and displacement combination is matched with the natural frequency of the reservoir of the target interval, and thus determining the viscosity and displacement combination meeting the requirements.
Generally, from the perspective of site construction, a displacement combination meeting the requirements is obtained as much as possible under the condition that the requirements can be met only by adjusting the displacement, and if the requirements cannot be met only by adjusting the displacement, the viscosity is adjusted until the requirements are met.
Step three: checking the strength of the sleeve, and determining the sleeve suitable for the combination of the viscosity and the discharge capacity;
step four: performing on-site fracturing by using the sleeve determined in the third step and the viscosity and discharge capacity combination determined in the second step;
according to fracturing design, corresponding reservoir parameter evaluation, liquid compatibility evaluation and the like are completed before construction, perforation positions and number are optimized, a geological model is established, eclipse is used for optimizing the half-seam length, the flow guiding capacity, the crack spacing and the like of a target layer, indoor pressure wave discharge parameters are combined according to an optimization result, meyer software is used for simulating and optimizing corresponding total liquid amount and proppant using amount, a pump injection parameter table is made, mature technologies are adopted, and details are not repeated.
Corresponding construction is carried out according to the pump injection parameter table, specific construction procedures are not repeated, a spiral alternative variable displacement mode is adopted in the construction process only according to indoor experimental simulation optimization results in the displacement aspect,
the embodiment just adjusts the discharge capacity, if the conditions of simultaneously adjusting the viscosity and the discharge capacity can occur to other wells, if the viscosity needs to be adjusted, the fracturing fluid with the relevant viscosity is prepared on site according to the viscosity needs, and then the construction is carried out according to the design pump injection construction parameter table.
Step five: and (3) finishing the subsequent process: the conventional process and parameter standards are referred to complete the links of replacement operation, drilling and plugging after pressing, flowback, testing, production and the like, which are all realized by adopting the prior art and are not described again.
The embodiment of the method of the invention is as follows:
[ EXAMPLES ] A method for producing a semiconductor device
And a certain Y well, which is a typical continental high-clay-content shale reservoir. The specific implementation steps are as follows:
(1) Acquiring the natural frequency of the target layer core;
the natural frequency of the core of the target layer is obtained by using the conventional core natural frequency testing device (for example, a rock natural frequency tester in a shale gas well disclosed by Chinese published patent document CN206091981U can be adopted). Specifically, place monitoring devices in appointed position in the pit, analysis test target layer natural frequency, the test result shows: the natural frequency of the core of the target layer is 60Hz.
(2) Obtaining by performing pressure pulse frequency test under different viscosity and displacement combinations
By using a physical simulation device under the condition of loading the opaque parallel plates (the existing device can refer to a transparent parallel plate crack device and a temporary holding branch crack simulation experiment device disclosed by Chinese patent publication CN208350745U and a direction-changeable parallel plate crack simulation device disclosed by Chinese patent publication CN 210217718U), a single parameter is changed, the change frequency of pressure waves is tested, and in order to facilitate testing and field construction, the test example mainly changes the discharge capacity, and the error between the frequency test result and the actual natural frequency is lower than 10 percent, so that the design requirement is met. According to the principle of similar criteria, the discharge capacity circulation mode of the site construction is 2-5-8-11-14-8-5-2m 3 /min。
Specifically, reference may be made to the literature "experimental research on the effect of hydraulic pulses on hydraulic fractures" (author: wang Yue, master thesis 2017) and "similar criteria in hydraulic fracturing simulation experiments" (author: liu Gonghui, university of petroleum (science edition) 2000), in order to obtain a pressure wave change frequency adapted to a core natural frequency through an indoor experiment, and further achieve a corresponding frequency change through site construction displacement change.
(3) Sleeve strength check
The damage condition of the casing under the change of the indoor pressure wave parameters is simulated by using commercial numerical simulation software Abaqus, and the influence of the indoor pressure wave frequency conversion parameters (displacement change and/or viscosity change in a spiral alternative variable displacement mode and periodic frequency parameters) on the casing strength is analyzed, namely whether fatigue damage can be caused or not under the spiral alternative variable displacement mode to cause casing damage. Through simulation analysis, the strength of the casing pipe meets the construction requirement under the variable displacement parameter condition, and if the strength of the casing pipe does not meet the construction requirement under the variable displacement parameter condition, the casing pipe is replaced and checked again until the casing pipe meeting the corresponding casing pipe strength is directly found.
(4) In situ fracturing
According to fracturing design, corresponding reservoir parameter evaluation, liquid compatibility evaluation and the like are completed before construction, perforation positions and number are optimized, a geological model is established, eclipse is used for optimizing the half-seam length, the flow guiding capacity, the crack spacing and the like of a target layer, indoor pressure wave discharge parameters are combined according to an optimization result, meyer software is used for simulating and optimizing corresponding total liquid amount and proppant using amount, a pump injection parameter table is formulated, the pump injection parameter table is realized by adopting the prior art, and the details are not repeated.
According to the pump injection parameter table, construction is performed correspondingly, concrete construction procedures are not repeated, and only in the aspect of displacement, according to indoor experiment simulation optimization results, concrete parameters are as shown in indoor optimization results: 2-5-8-11-14-8-5-2m 3 And/min, a spiral alternative variable displacement mode, namely 2-5-8-11-14-8-5-2-5-8-11-14-8-5-2 … … is adopted in the construction process, and the fracture complexity index exceeds 24% of that of an adjacent well under the variable displacement construction mode by utilizing the resonance pulse pressure wave fracturing technology according to pressure gauge data feedback and microseism data monitoring results, so that the purposes of improving the fracture complexity and the transformation effect are achieved, and other measures for changing viscosity and adjusting variable displacement time intervals are not needed at the moment.
And (4) completing the fracturing.
(5) And (4) finishing subsequent construction: the links of replacing operation, drilling and plugging after pressing, flowback, testing, production and the like are completed according to the conventional flow and parameter standards, and the links are realized by adopting the prior art, so that the details are not repeated.
The invention provides a yield increasing technology for improving the fracture transformation volume by the resonance effect of a pressure pulse wave with the frequency equal to that of a target reservoir, which is characterized in that pressure gauges are respectively additionally arranged at an inlet and an outlet of an opaque parallel plate physical simulation device through an indoor experiment, and the pressure wave frequencies under different viscosity and discharge capacity combinations are observed and recorded. If the error between the frequency and the natural frequency of the target layer is less than 10%, constructing according to the requirement, and utilizing the resonance effect to furthest improve the complexity and the reconstruction volume of the reservoir fracture.
[ example two ]
An embodiment of a resonant pulsed pressure wave fracturing system with the same frequency as a target zone provided by the invention is shown in fig. 2, and the system comprises:
a natural frequency obtaining unit 10, configured to obtain a natural frequency of a reservoir in a target interval;
the viscosity and displacement combination confirming unit 20 is connected with the natural frequency acquiring unit 10 and is used for determining the viscosity and displacement combination matched with the natural frequency of the reservoir of the target interval;
the sleeve checking unit 30 is connected with the viscosity and discharge combination confirming unit 20 and used for checking the strength of the sleeve and determining the sleeve suitable for the matched viscosity and discharge combination;
the fracturing unit 40 is respectively connected with the viscosity and discharge capacity combination confirmation unit 20 and the casing checking unit 30, and is used for performing on-site fracturing by using the casing determined by the casing checking unit and the viscosity and discharge capacity combination matched with the viscosity and discharge capacity combination determined by the viscosity and discharge capacity combination confirmation unit;
and the subsequent construction unit 50 is connected with the fracturing unit 40 and used for completing subsequent construction.
[ EXAMPLE III ]
The natural frequency acquisition unit comprises a core natural frequency testing device.
[ EXAMPLE IV ]
The viscosity and displacement combination confirmation unit includes:
the setting subunit is used for setting N groups of different viscosity and displacement combinations;
the testing subunit is connected with the setting subunit and is used for respectively testing the pressure pulse frequency of each group of viscosity and displacement combination to obtain the pressure pulse frequency under different viscosity and displacement combinations;
and the judging subunit is connected with the testing subunit and is used for respectively judging whether the error between the pressure pulse frequency under each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a threshold value, and if so, judging that the group of viscosity and displacement combination is matched with the natural frequency of the reservoir of the target interval.
The above-described embodiments are intended to be illustrative only, and various modifications and variations such as those described in the above-described embodiments of the invention may be readily made by those skilled in the art based upon the teachings and teachings of the present invention without departing from the spirit and scope of the invention.
Claims (10)
1. A resonant pulse pressure wave fracturing method with the same frequency as a target layer is characterized in that: according to the method, the combination of viscosity and discharge capacity of the fracturing fluid is changed, so that the frequency of the pressure pulse wave generated by the fracturing fluid is matched with the inherent frequency of the reservoir at the target interval, the resonance effect is further exerted, and the complexity and the modification volume of the reservoir fracture are improved.
2. The resonant pulsed pressure wave fracturing method of claim 1 with the same frequency as the target formation, characterized in that: the method comprises the following steps:
the method comprises the following steps: acquiring the natural frequency of a reservoir in a target interval;
step two: determining a viscosity and displacement combination matched with the natural frequency of the reservoir in the target interval;
step three: checking the strength of the casing, and determining the casing suitable for the matched viscosity and displacement combination;
step four: performing on-site fracturing by using the sleeve determined in the third step and the matched viscosity and displacement combination determined in the second step;
step five: and finishing the subsequent construction.
3. The resonant pulsed pressure wave fracturing method of claim 2 with the same frequency as the target formation, characterized in that: the operation of the first step comprises the following steps:
and testing the collected core of the reservoir of the target interval by using the core natural frequency testing device to obtain the natural frequency of the reservoir of the target interval.
4. The resonant pulsed pressure wave fracturing method of claim 2 with the same frequency as the target formation, characterized in that: the operation of the second step comprises the following steps:
(21) Setting N groups of different viscosity and discharge volume combinations;
(22) Respectively carrying out pressure pulse frequency test on each group of viscosity and displacement combination to obtain pressure pulse frequencies under different viscosity and displacement combinations;
(23) And respectively judging whether the error between the pressure pulse frequency under each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a threshold value, if so, judging that the viscosity and displacement combination of the group is matched with the natural frequency of the reservoir of the target interval.
5. The resonant pulsed pressure wave fracturing method of claim 4 with the same frequency as the target formation, characterized in that: the threshold is 10%.
6. The resonant pulsed pressure wave fracturing method of claim 2 with the same frequency as the target formation, characterized in that: and in the fourth step, fracturing construction is carried out by adopting a spiral alternative variable displacement mode.
7. A resonant pulsed pressure wave fracturing system having the same frequency as a target formation, characterized by: the system comprises:
the natural frequency acquisition unit is used for acquiring the natural frequency of the reservoir of the target interval;
the viscosity and displacement combination confirmation unit is connected with the natural frequency acquisition unit and is used for determining the viscosity and displacement combination matched with the natural frequency of the reservoir of the target interval;
the sleeve checking unit is connected with the viscosity and discharge combination confirming unit and used for checking the strength of the sleeve and determining the sleeve suitable for the matched viscosity and discharge combination;
the fracturing unit is respectively connected with the viscosity and discharge capacity combination confirmation unit and the sleeve checking unit and is used for performing on-site fracturing by utilizing the sleeve determined by the sleeve checking unit and the viscosity and discharge capacity combination which is matched with the viscosity and discharge capacity combination determined by the viscosity and discharge capacity combination confirmation unit;
and the follow-up construction unit is connected with the fracturing unit and is used for finishing follow-up construction.
8. The resonant pulsed pressure wave fracturing system of claim 7 having the same frequency as the target formation, wherein: the natural frequency acquisition unit comprises a core natural frequency testing device.
9. The resonant pulsed pressure wave fracturing system of claim 7 having the same frequency as the target formation, wherein: the viscosity and displacement combination confirmation unit includes:
the setting subunit is used for setting N groups of different viscosity and displacement combinations;
the testing subunit is connected with the setting subunit and is used for respectively testing the pressure pulse frequency of each group of viscosity and displacement combination to obtain the pressure pulse frequency under different viscosity and displacement combinations;
and the judging subunit is connected with the testing subunit and is used for respectively judging whether the error between the pressure pulse frequency under each group of viscosity and displacement combination and the natural frequency of the reservoir of the target interval is smaller than a threshold value, and if so, judging that the group of viscosity and displacement combination is matched with the natural frequency of the reservoir of the target interval.
10. A computer-readable storage medium characterized by: the computer-readable storage medium stores at least one program executable by a computer, the at least one program, when executed by the computer, causing the computer to perform the steps in a resonant pulsed pressure wave fracturing method of any one of claims 1-6 at the same frequency as a target layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110431667.7A CN115217457A (en) | 2021-04-21 | 2021-04-21 | Resonant pulse pressure wave fracturing method and system with same frequency as target layer |
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| CN202110431667.7A CN115217457A (en) | 2021-04-21 | 2021-04-21 | Resonant pulse pressure wave fracturing method and system with same frequency as target layer |
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