CN116220646A - Multi-cluster temporary plugging blasthole fracturing simulation device suitable for tight reservoir - Google Patents
Multi-cluster temporary plugging blasthole fracturing simulation device suitable for tight reservoir Download PDFInfo
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- CN116220646A CN116220646A CN202310392733.3A CN202310392733A CN116220646A CN 116220646 A CN116220646 A CN 116220646A CN 202310392733 A CN202310392733 A CN 202310392733A CN 116220646 A CN116220646 A CN 116220646A
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- 238000004088 simulation Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000003795 chemical substances by application Substances 0.000 abstract description 39
- 239000012530 fluid Substances 0.000 abstract description 38
- 238000012360 testing method Methods 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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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
- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention relates to the technical field of oil and gas development, in particular to a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir, which comprises a water tank, a centrifugal pump, a total throttle valve, a total flowmeter, a ball throwing port, a front end shaft, a connecting section shaft, a first connecting channel, a second connecting channel, a perforating section shaft, a third connecting channel, a tail end shaft and a fourth connecting channel; the fracturing fluid configuration materials in the water tank are pumped out by the centrifugal pump, temporary plugging agents are put into from the ball throwing port, enter the connecting section shaft and the perforating section shaft after being pumped into the front end shaft along with the fracturing fluid, simulate the dominant cracks and the inferior cracks by changing the flow velocity in the first connecting channel, the second connecting channel, the third connecting channel and the fourth connecting channel, observe the plugging condition of the perforating position, record the plugging condition of the plugging agents, calculate the plugging rate, and can test the plugging rate of the plugging agents to the blastholes under different perforating modes, so that test data are more comprehensive.
Description
Technical Field
The invention relates to the technical field of oil gas development, in particular to a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir.
Background
The deep unconventional oil gas development has great potential, the current deep shale gas development is mostly carried out by adopting a multi-cluster perforation dense cutting fracturing mode, the current optimization design of temporary plugging in a section is mainly carried out by on-site monitoring, the cost is high, the plugging rate of a plugging agent to a blasthole under different perforation modes is not explicitly and regularly distributed and better testing devices are not provided, and the testing data of the plugging rate of the plugging agent to the blasthole under different perforation modes are not comprehensive enough.
Disclosure of Invention
The invention aims to provide a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir, which can test the plugging rate of plugging agents to blastholes under different perforation modes.
In order to achieve the aim, the invention provides a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir, which comprises a water tank, a centrifugal pump, a total throttle valve, a total flowmeter, a ball throwing port, a front end shaft, a connecting section shaft, a first connecting channel, a second connecting channel, a perforating section shaft, a third connecting channel, a tail end shaft and a fourth connecting channel;
the centrifugal pump is communicated with the water tank and is positioned at one side of the water tank; the total throttle valve is communicated with the centrifugal pump and is positioned at one side of the centrifugal pump; the total flowmeter is communicated with the total throttle valve and is positioned at one side of the total throttle valve; the ball throwing port is communicated with the total flowmeter and is positioned at one side of the total flowmeter; the front end shaft is communicated with the ball throwing port and is positioned at one side of the ball throwing port; the connecting section shaft is connected with the front end shaft and is positioned at one side of the front end shaft; the first connecting channel is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the second connecting channel is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the perforating section shaft is connected with the connecting section shaft and positioned at one side of the connecting section shaft, and the perforating section shaft is provided with a plurality of first perforations; the third connecting port is communicated with the first perforation and the water tank respectively and is positioned between the first perforation and the water tank; the tail end shaft is connected with the perforating section shaft and positioned at one side of the perforating section shaft, and the tail end shaft is provided with a plurality of second perforations; the fourth connecting channel is respectively communicated with the second perforation and the water tank and is positioned between the second perforation and the water tank.
Wherein, the multi-cluster temporary plugging blasthole fracturing simulation device suitable for the tight reservoir further comprises a stirrer; the stirrer is arranged inside the water tank.
Wherein the first connection comprises a first hose, a first throttle valve, and a first flow meter; the first hose is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the first throttle valve is fixedly connected with the first hose and is positioned at the side edge of the first hose; the first flowmeter is fixedly connected with the first hose and is positioned at the side edge of the first hose.
Wherein the second connection channel comprises a second hose, a second throttle valve and a second flowmeter; the second hose is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the second throttle valve is fixedly connected with the second hose and is positioned at the side edge of the second hose; the second flowmeter is fixedly connected with the second hose and is positioned at the side edge of the second hose.
Wherein the third connecting channel comprises a third hose, a third throttle valve and a third flowmeter; the third hose is respectively communicated with the first perforation and the water tank and is positioned between the first perforation and the water tank; the third throttle valve is fixedly connected with the third hose and is positioned at the side edge of the third hose; the third flowmeter is fixedly connected with the third hose and is positioned at the side edge of the third hose.
The fourth connecting channel comprises a fourth hose, a fourth throttle valve and a fourth flowmeter; the fourth hose is respectively communicated with the second perforation and the water tank and is positioned between the second perforation and the water tank; the fourth throttle valve is fixedly connected with the fourth hose and is positioned at the side edge of the fourth hose; the fourth flowmeter is fixedly connected with the fourth hose and is positioned at the side edge of the fourth hose.
The invention relates to a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir, wherein during testing, fracturing fluid configuration materials are filled in a water tank, the fracturing fluid configuration materials are pumped out by a centrifugal pump, a total throttle valve is regulated, the pumping-out flow rate is regulated, the total flow meter is opened to record the flow rate of the pumped fracturing fluid at the moment, after the flow rate is stable, temporary plugging agent is thrown in from a ball throwing port, enters a connecting section shaft and a perforating section shaft after being pumped into the front end shaft along with fracturing fluid, the first perforating and the second perforating are 6, the phase angle is 60 degrees (the front end shaft, the connecting section shaft, the perforating section shaft and the tail end shaft can be assembled according to experimental requirements, each short joint length can be designed by itself, the short joint setting length of the device is 120mm, the target shaft length is assembled by itself, the perforation cluster spacing is controlled by adding and subtracting the connecting shaft), the first perforation and the second perforation are respectively connected with the third connection channel and the fourth connection channel (the first perforation and the second perforation can be provided with perforation numbers according to experimental requirements, each short circuit is provided with a perforation with a phase angle of 60 degrees, the perforation which is needed in the experiment is released, the unnecessary perforation is screwed up by a plastic cap), the temporary plugging agent enters the perforation of a shaft with larger flow rate along with fracturing fluid by controlling the pressure in the first connection channel, the second connection channel, the third connection channel and the fourth connection channel, dominant cracks and inferior cracks are simulated by changing the flow rates in the first connection channel, the second connection channel, the third connection channel and the fourth connection channel, the plugging condition of the perforation is observed after the device is continuously operated for 5 minutes, recording the plugging condition of the plugging agent, calculating the plugging rate (the ratio of the number of plugged perforations to the total open perforations), and enabling the fracturing fluid to flow into a water tank from the first connecting channel, the second connecting channel, the third connecting channel and the fourth connecting channel after the fracturing fluid is used, so that the recycling of the fracturing fluid is realized. It is worth mentioning that the first perforation on the perforation section shaft takes concentric circles as a unit, each concentric circle is designed to be 6 perforations, the perforation phase angle is 60 degrees, each perforation phase angle of the first concentric circle and the second concentric circle of the left number is different by 30 degrees, so that the device can respectively measure the influence of different phase angles on plugging rate of plugging agents when the phase angles are 30 degrees, 60 degrees, 90 degrees, 120 degrees and 180 degrees, for example: if the phase angle is 30 degrees, when the plugging rate of the plugging agent is required to be influenced, a first concentric circle of the left number takes a 0 phase angle as a base point, a first perforation is opened, a second perforation with a phase angle difference of 30 degrees is opened on a second concentric circle of the left number, and the like, the perforation and perforation interval are controlled by adding and subtracting the connecting section shaft between the two perforations, and the second perforation on the tail end shaft is consistent with the perforation section shaft in arrangement mode. By the method, the plugging rate of the plugging agent to the blasthole under different perforation modes can be tested, so that the test data are more comprehensive.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs of the present invention.
FIG. 2 is an elevation view of an articulated well bore of the invention.
FIG. 3 is a side view of a junction wellbore of the present invention.
FIG. 4 is an elevation view of a perforated section wellbore of the present invention.
Figure 5 is a side view of a perforated section wellbore of the present invention.
Fig. 6 is an elevation view of an end wellbore of the present invention.
FIG. 7 is a side view of an end wellbore of the present invention.
Fig. 8 is a front view of the adapter of the present invention.
Fig. 9 is a side view of the adapter of the present invention.
1-water tank, 2-centrifugal pump, 3-total throttle valve, 4-total flow meter, 5-ball injection port, 6-front end wellbore, 7-connection section wellbore, 8-first connection passage, 9-second connection passage, 10-perforation section wellbore, 11-third connection passage, 12-end wellbore, 13-fourth connection passage, 14-stirrer, 15-adapter, 81-first hose, 82-first throttle valve, 83-first flow meter, 91-second hose, 92-second throttle valve, 93-second flow meter, 100-first perforation, 111-third hose, 112-third throttle valve, 113-third flow meter, 120-second perforation, 131-fourth hose, 132-fourth throttle valve, 133-fourth flow meter.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 9, the present invention provides a multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir: the device comprises a water tank 1, a centrifugal pump 2, a total throttle valve 3, a total flowmeter 4, a ball throwing port 5, a front end shaft 6, a connecting section shaft 7, a first connecting channel 8, a second connecting channel 9, a perforating section shaft 10, a third connecting channel 11, a tail end shaft 12 and a fourth connecting channel 13;
the centrifugal pump 2 is communicated with the water tank 1 and is positioned at one side of the water tank 1; the total throttle valve 3 is communicated with the centrifugal pump 2 and is positioned at one side of the centrifugal pump 2; the total flowmeter 4 is communicated with the total throttle valve 3 and is positioned at one side of the total throttle valve 3; the ball throwing port 5 is communicated with the total flow meter 4 and is positioned at one side of the total flow meter 4; the front end shaft 6 is communicated with the ball throwing port 5 and is positioned at one side of the ball throwing port 5; the connecting section shaft 7 is connected with the front end shaft 6 and is positioned on one side of the front end shaft 6; the first connecting channel 8 is respectively communicated with the connecting section shaft 7 and the water tank 1 and is positioned between the connecting section shaft 7 and the water tank 1; the second connecting channel 9 is respectively communicated with the connecting section shaft 7 and the water tank 1 and is positioned between the connecting section shaft 7 and the water tank 1; the perforation section shaft 10 is connected with the connection section shaft 7 and is positioned at one side of the connection section shaft 7, and the perforation section shaft 10 is provided with a plurality of first perforations 100; the third connection is communicated with the first perforation 100 and the water tank 1 respectively and is positioned between the first perforation 100 and the water tank 1; the end shaft 12 is connected with the perforation section shaft 10 and is positioned at one side of the perforation section shaft 10, and the end shaft 12 is provided with a plurality of second perforations 120; the fourth connecting passage 13 communicates with the second perforation 120 and the water tank 1, respectively, and is located between the second perforation 120 and the water tank 1.
In this embodiment, the left end of the end shaft 12 is closed, the end of the end shaft of the simulated perforation well is threaded, and the right end of the end shaft is threaded, so that the end shaft is convenient to connect with or detach from other pipelines; the perforating section shaft 10 is provided with threads on left and right sections for connection between shafts, threads are arranged at the first perforation 100 on the perforating section shaft 10, the first perforation 100 which is needed to be used is reserved when the operation is carried out, other first perforations 100 are fastened by nuts, and the study of the influence of perforation number and perforation phase angle on the perforation plugging rate is facilitated; the connecting section shaft 7 is provided with threads in a left-right turning mode, so that the connecting section shaft 7 is convenient to connect with other shafts, the middle part of the connecting section shaft is not provided with holes, the connecting section shaft 7 can be flexibly modified and reduced, and the perforation cluster spacing and perforation section spacing can be conveniently controlled; the front end shaft 6, the connecting section shaft 7, the perforating section shaft 10 and the tail end shaft 12 are all made of organic glass, so that the strength is high, the perforating well shaft is simulated, and the migration condition and the plugging condition of temporary plugging agents in the shafts are conveniently observed; during testing, the water tank 1 is filled with fracturing fluid configuration materials, pumped by the centrifugal pump 2, the total throttle valve 3 is regulated, the pumped flow is regulated, the total flow meter 4 is opened to record the flow of the fracturing fluid pumped at the moment, after the flow is stable, temporary plugging agent is thrown in from the ball throwing port 5, and enters the connecting section shaft 7 and the perforating section shaft 10 after being pumped into the front end shaft 6 along with fracturing fluid, the first perforating holes 100 and the second perforating holes 120 are 6, the phase angle is 60 degrees (the front end shaft 6, the connecting section shaft 7, the perforating section shaft 10 and the tail end shaft 12 can be assembled according to experimental requirements, each shorting length can be designed by itself, the shorting setting length of the device is 120mm, the target shaft length is assembled by itself, the perforation cluster distance is controlled by adding and subtracting the connecting shaft), the first perforation 100 and the second perforation 120 are respectively connected with the third connection channel 11 and the fourth connection channel 13 (the number of perforations can be set according to experimental requirements by the first perforation 100 and the second perforation 120, each short-cut perforation with a phase angle of 60 degrees is opened, the perforation which is needed in the experiment is released, the unnecessary perforation is screwed by a plastic cap), by controlling the pressure in the first connection channel 8, the second connection channel 9, the third connection channel 11 and the fourth connection channel 13, temporary plugging agent enters a well bore to plug the perforation with larger flow rate along with fracturing fluid, by changing the flow rate in the first connection channel 8, the second connection channel 9, the third connection channel 11 and the fourth connection channel 13, dominant cracks and minor cracks are simulated, the situation of the perforation is observed after the device continuously runs for 5 minutes, recording the plugging condition of the plugging agent, calculating the plugging rate (the ratio of the number of plugged perforations of the plugging agent to the total number of open perforations), and enabling the fracturing fluid to flow into the water tank 1 from the first connecting channel 8, the second connecting channel 9, the third connecting channel 11 and the fourth connecting channel 13 after the fracturing fluid is used, so that the recycling of the fracturing fluid is realized. It should be noted that, the first perforation 100 on the perforation section shaft 10 takes concentric circles as a unit, each concentric circle is designed as 6 perforations, the perforation phase angle is 60 degrees, and each perforation phase angle of the first concentric circle and the second concentric circle of the left number is different by 30 degrees, so that the device can respectively measure the influence of different phase angles on the plugging rate of the plugging agent when the phase angles are 30 degrees, 60 degrees, 90 degrees, 120 degrees and 180 degrees, for example: if the phase angle is 30 degrees, when the plugging rate of the plugging agent is required to be tested, the first concentric circle of the left number takes a 0 phase angle as a base point, the first perforation is opened, the second concentric circle of the left number opens the second perforation of which the phase angle difference is 30 degrees, and so on, the perforating and perforating distance are controlled by adding and subtracting the connecting section shaft 7 between the two perforations, and the setting mode of the second perforation 120 on the tail end shaft 12 is consistent with that of the perforating section shaft 10. By the method, the plugging rate of the plugging agent to the blasthole under different perforation modes can be tested, so that the test data are more comprehensive.
Further, the multi-cluster temporary plugging blasthole fracturing simulation device suitable for the tight reservoir further comprises a stirrer 14; the stirrer 14 is disposed inside the water tank 1.
In the present embodiment, the stirrer 14 may stir the fracturing fluid placement material in the water tank 1 to sufficiently mix the fracturing fluid,
further, the first connection passage 8 includes a first hose 81, a first throttle valve 82, and a first flowmeter 83; the first hose 81 is respectively communicated with the connecting section shaft 7 and the water tank 1, and is positioned between the connecting section shaft 7 and the water tank 1; the first throttle valve 82 is fixedly connected with the first hose 81 and is positioned at the side edge of the first hose 81; the first flowmeter 83 is fixedly connected with the first hose 81 and is located at the side of the first hose 81.
In this embodiment, the first hose 81 is used to return the temporary plugging agent and the fracturing fluid in the connecting section wellbore 7 to the water tank 1 for reuse; the first throttle valve 82 is used for controlling the flow rate of the temporary plugging agent and the fracturing fluid in the first hose 81, and the first flowmeter 83 is used for testing the flow rate of the temporary plugging agent and the fracturing fluid.
Further, the second connection channel 9 includes a second hose 91, a second throttle valve 92, and a second flowmeter 93; the second hose 91 is respectively communicated with the connecting section shaft 7 and the water tank 1, and is positioned between the connecting section shaft 7 and the water tank 1; the second throttle valve 92 is fixedly connected with the second hose 91 and is positioned at the side edge of the second hose 91; the second flowmeter 93 is fixedly connected to the second hose 91 and is located at a side of the second hose 91.
In this embodiment, the second hose 91 is used to return the temporary plugging agent and the fracturing fluid in the connecting section wellbore 7 to the water tank 1 for reuse; the second throttle valve 92 is used for controlling the flow rate of the temporary plugging agent and the fracturing fluid in the second hose 91, and the second flowmeter 93 is used for testing the flow rate of the temporary plugging agent and the fracturing fluid.
Further, the third connection passage 11 includes a third hose 111, a third throttle valve 112, and a third flowmeter 113; the third hose 111 communicates with the first perforation 100 and the water tank 1, respectively, and is located between the first perforation 100 and the water tank 1; the third throttle valve 112 is fixedly connected with the third hose 111 and is positioned at the side of the third hose 111; the third flowmeter 113 is fixedly connected to the third hose 111 and is located at a side of the third hose 111.
In this embodiment, the third hose 111 is used to return the temporary plugging agent and the fracturing fluid in the perforated section wellbore 10 to the water tank 1 for reuse; the third throttle valve 112 is used for controlling the flow rate of the temporary plugging agent and the fracturing fluid in the third hose 111, and the third flowmeter 113 is used for testing the flow rate of the temporary plugging agent and the fracturing fluid.
Further, the fourth connection channel 13 includes a fourth hose 131, a fourth throttle valve 132, and a fourth flow meter 133; the fourth hose 131 is respectively communicated with the second perforation 120 and the water tank 1, and is positioned between the second perforation 120 and the water tank 1; the fourth throttle 132 is fixedly connected with the fourth hose 131 and is positioned at the side edge of the fourth hose 131; the fourth flowmeter 133 is fixedly connected to the fourth hose 131, and is located at a side of the fourth hose 131.
In this embodiment, the fourth hose 131 is used to return the temporary plugging agent and the fracturing fluid in the end wellbore 12 to the water tank 1 for reuse; the fourth throttle valve 132 is used for controlling the flow rate of the temporary plugging agent and the fracturing fluid in the fourth hose 131, and the fourth flowmeter 133 is used for testing the flow rate of the temporary plugging agent and the fracturing fluid.
Further, the multi-cluster temporary plugging blasthole fracturing simulation device suitable for the tight reservoir further comprises an adapter 15, and the adapter 15 is arranged on the front-end shaft 6.
In this embodiment, the adapter 15 is used to connect the wellbore and the pump.
In the multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir, in the test, a fracturing fluid preparation material is filled in the water tank 1, the fracturing fluid preparation material is pumped out by the centrifugal pump 2, the total throttle valve 3 is regulated, the pumped-out flow rate is regulated, the total flow meter 4 is opened to record the flow rate of the fracturing fluid pumped in at the moment, after the flow rate is stable, temporary plugging agent is thrown in from the ball throwing port 5, enters the connecting section shaft 7 and the perforating section shaft 10 after being pumped into the front end shaft 6 along with the fracturing fluid, the number of the first perforation 100 and the second perforation 120 is 6, the phase angle is 60 degrees (the front end shaft 6, the connecting section shaft 7, the perforating section shaft 10 and the tail end shaft 12 can be assembled according to the experimental requirement, each short joint length can be designed by itself, the short joint setting length of the device is 120mm, the target shaft length is assembled by itself, the perforation cluster spacing is controlled by adding and subtracting connecting shafts), the first perforation 100 and the second perforation 120 are respectively connected with the third connecting channel 11 and the fourth connecting channel 13 (the first perforation 100 and the second perforation 120 can be provided with perforation numbers according to experimental requirements, each short-cut is provided with a perforation with a phase angle of 60 degrees, the perforation which is needed in the experiment is released, the unnecessary perforation is screwed by a plastic cap), by controlling the pressure in the first throttle valve 82, the second throttle valve 92, the third throttle valve 112 and the throttle valve regulating pipe, temporary plugging agent enters the shaft to plug the perforation with larger flow rate along with fracturing fluid, and dominant cracks and inferior cracks are simulated by changing the flow rates in the first connecting channel 8, the second connecting channel 9, the third connecting channel 11 and the fourth connecting channel 13, after the device continuously operates for 5 minutes, the plugging condition of the perforation is observed, the plugging condition of the plugging agent is recorded, the plugging rate (the ratio of the number of the plugged perforations to the total open perforations) is calculated, after the use is finished, the first throttle valve 82, the second throttle valve 92, the third throttle valve 112 and the throttle valves are fully opened, and the fracturing fluid flows into the water tank 1 from the first hose 81, the second hose 91, the third hose 111 and the fourth hose 131, so that the recycling of the fracturing fluid is realized. When the crack simulation is carried out, as the flow speed of the dominant crack is high, the dominant crack is preferentially blocked by the plugging agent, the dominant crack is inhibited from continuing to expand, the well shaft is pressurized, the inferior crack is expanded, the uniform development of the whole section of well shaft crack is achieved, the pressure in each hose is different by controlling the throttle valve, and the flow of each hose is observed to change after the temporary plugging agent is put in, so that the simulation of the crack is achieved. When the plugging rate test calculation is carried out, under the conditions of the same fracturing mode, perforation cluster number, perforation interval and perforation phase angle, the plugging rate under various conditions is obtained by repeatedly inputting temporary plugging agents, and the ratio of the plugging agent plugging perforation number to the total open perforation number is obtained after the experimental process is finished. According to the invention, the plugging rate test can be performed under the conditions of changing perforation parameters, changing perforation modes and simulating multi-cluster crack propagation, so that the test data is more comprehensive.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (6)
1. A multi-cluster temporary plugging blasthole fracturing simulation device suitable for a tight reservoir is characterized in that,
the device comprises a water tank, a centrifugal pump, a total throttle valve, a total flowmeter, a ball throwing port, a front end shaft, a connecting section shaft, a first connecting channel, a second connecting channel, a perforating section shaft, a third connecting channel, a tail end shaft and a fourth connecting channel;
the centrifugal pump is communicated with the water tank and is positioned at one side of the water tank; the total throttle valve is communicated with the centrifugal pump and is positioned at one side of the centrifugal pump; the total flowmeter is communicated with the total throttle valve and is positioned at one side of the total throttle valve; the ball throwing port is communicated with the total flowmeter and is positioned at one side of the total flowmeter; the front end shaft is communicated with the ball throwing port and is positioned at one side of the ball throwing port; the connecting section shaft is connected with the front end shaft and is positioned at one side of the front end shaft; the first connecting channel is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the second connecting channel is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the perforating section shaft is connected with the connecting section shaft and positioned at one side of the connecting section shaft, and the perforating section shaft is provided with a plurality of first perforations; the third connecting port is communicated with the first perforation and the water tank respectively and is positioned between the first perforation and the water tank; the tail end shaft is connected with the perforating section shaft and positioned at one side of the perforating section shaft, and the tail end shaft is provided with a plurality of second perforations; the fourth connecting channel is respectively communicated with the second perforation and the water tank and is positioned between the second perforation and the water tank.
2. A multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs as claimed in claim 1,
the multi-cluster temporary plugging blasthole fracturing simulation device suitable for the tight reservoir further comprises a stirrer; the stirrer is arranged inside the water tank.
3. A multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs as claimed in claim 1,
the first connection comprises a first hose, a first throttle valve and a first flowmeter; the first hose is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the first throttle valve is fixedly connected with the first hose and is positioned at the side edge of the first hose; the first flowmeter is fixedly connected with the first hose and is positioned at the side edge of the first hose.
4. A multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs as claimed in claim 1,
the second connecting channel comprises a second hose, a second throttle valve and a second flowmeter; the second hose is respectively communicated with the connecting section shaft and the water tank and is positioned between the connecting section shaft and the water tank; the second throttle valve is fixedly connected with the second hose and is positioned at the side edge of the second hose; the second flowmeter is fixedly connected with the second hose and is positioned at the side edge of the second hose.
5. A multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs as claimed in claim 1,
the third connecting channel comprises a third hose, a third throttle valve and a third flowmeter; the third hose is respectively communicated with the first perforation and the water tank and is positioned between the first perforation and the water tank; the third throttle valve is fixedly connected with the third hose and is positioned at the side edge of the third hose; the third flowmeter is fixedly connected with the third hose and is positioned at the side edge of the third hose.
6. A multi-cluster temporary plugging blasthole fracturing simulation apparatus suitable for tight reservoirs as claimed in claim 1,
the fourth connecting channel comprises a fourth hose, a fourth throttle valve and a fourth flowmeter; the fourth hose is respectively communicated with the second perforation and the water tank and is positioned between the second perforation and the water tank; the fourth throttle valve is fixedly connected with the fourth hose and is positioned at the side edge of the fourth hose; the fourth flowmeter is fixedly connected with the fourth hose and is positioned at the side edge of the fourth hose.
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