Experimental device for simulating vertical crack generation of fractured horizontal well

Abstract

The utility model relates to an experimental device for simulating vertical cracks generated by a fractured horizontal well. The experimental device comprises a loop composed of a power supply module and a crack simulation module. The crack simulation module is connected in parallel with a pressure test module and connected in series with a current test module; the pressure test module and the current test module are electrically connected with the external computer; the crack simulation module comprises an electrolytic cell, electrolyte is arranged in the electrolytic cell, the electrolytic cell simulates a supply boundary through an aluminum plate strip, a horizontal section is simulated through horizontally-arranged columnar aluminum, grooves surrounding the columnar aluminum by a circle are formed in the horizontal extending direction perpendicular to the columnar aluminum at intervals, and the side walls of the grooves located at the two ends are sleeved with aluminum sheets used for simulating vertical cracks. The aluminum sheet moves in the horizontal extending direction of the columnar aluminum, and the moving distance each time is a multiple of the distance between every two adjacent grooves. According to the utility model, the hydroelectric simulation experiment and the actual condition of the oil reservoir are effectively and closely linked, and the experiment error is reduced to the greatest extent.

Description

Technical Field

[0001] This utility model relates to the field of research on fractured horizontal wells, and in particular to an experimental device for simulating the generation of vertical fractures in fractured horizontal wells. Background Technology

[0002] To better and more intuitively reflect the actual situation after fracturing horizontal wells, a hydroelectric simulation experiment is established based on the principle of hydroelectric similarity, using electrical potential to simulate the corresponding seepage field. This experiment can clearly reflect the seepage of oil and gas in the formation after fracturing, resolving the unclear relationship between horizontal well fracturing and oil well productivity in actual production. Summary of the Invention

[0003] This invention aims to solve the above problems by simulating the production process of complex fractured horizontal wells through a visualized hydroelectric simulation experiment, so as to grasp the seepage law of oil and gas after fracturing in a timely and efficient manner, and clarify the relationship between fractures and oil well productivity by changing the spacing and length of fractures.

[0004] The technical solution of this utility model is as follows:

[0005] An experimental device for simulating the generation of vertical fractures in a fractured horizontal well includes a circuit consisting of a power supply module and a fracture simulation module; the fracture simulation module is connected in parallel with a pressure testing module and in series with a current testing module; it also includes an external computer, and both the pressure testing module and the current testing module are electrically connected to the external computer; the fracture simulation module includes an electrolytic cell containing an electrolyte that simulates an oil layer and does not react with aluminum, the electrolytic cell uses aluminum plates to simulate the supply boundary, and horizontally arranged columnar aluminum pieces to simulate the horizontal section, with grooves spaced around the columnar aluminum pieces at intervals perpendicular to the horizontal extension direction of the columnar aluminum pieces, and aluminum sheets for simulating vertical fractures are sleeved on the sidewalls of the grooves at both ends, the aluminum sheets move along the horizontal extension direction of the columnar aluminum pieces, and the distance moved each time is a multiple of the distance between adjacent grooves.

[0006] It also includes aluminum wire to simulate a pulley, with the aluminum sheet wound around the groove by the aluminum wire.

[0007] A frequency generator is also provided between the output end of the crack simulation module and the power supply module.

[0008] A voltage regulator is also provided between the frequency generator and the power supply module.

[0009] The power supply module includes a power source and a transformer connected in sequence. The output end of the transformer is connected to the input end of the crack simulation module. The output end of the crack simulation module is connected to the power source via a frequency generator and a voltage regulator. The power source provides 220V AC power, and the output voltage of the transformer is greater than 6V.

[0010] The pressure testing module is a voltmeter, and the current testing module is an ammeter, with the ammeter located on the connecting pipe between the frequency generator and the voltage regulator.

[0011] The electrolytic cell is an electrolytic cell using NaCl solution as the electrolyte. The electrolytic cell is an acrylic cylinder with a diameter of 45 cm and a height of 5 cm; the columnar aluminum has a diameter of 20 mm and a length of 40 cm; the aluminum sheet has a diameter of 0.5 mm. The distance between adjacent grooves is 1 cm.

[0012] The technical advantages of this utility model are as follows:

[0013] This invention simulates an oil layer in actual production using an electrolyte, and uses horizontally positioned columnar aluminum to simulate horizontal sections. Grooves are spaced around the columnar aluminum at intervals perpendicular to its horizontal extension direction. Aluminum sheets simulating vertical cracks are fitted onto the sidewalls of these grooves at both ends. The aluminum sheets move along the horizontal extension direction of the columnar aluminum, and the grooves control their position. The sheets move from one groove to another, simulating the adjustment of the vertical crack spacing. Voltage values ​​are obtained through a pressure testing module, and current values ​​are obtained through a current testing module. A similarity criterion is used for transition and unification, converting current, voltage, and isobars into production, pressure, and isobars in the seepage field. This invention effectively links the hydroelectric simulation experiment closely with the actual reservoir conditions, minimizing experimental errors. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Reference numerals: 1. Power supply; 2. Transformer; 4. Voltmeter; 6. Columnar aluminum; 7. Vertical crack; 8. Electrolytic cell; 9. Electrolyte; 10. Pulley; 11. Frequency generator; 12. Ammeter; 13. Voltage regulator. Detailed Implementation

[0016] Example 1

[0017] An experimental device for simulating the generation of vertical fractures in a horizontally fractured well includes a circuit consisting of a power supply module and a fracture simulation module. The fracture simulation module is connected in parallel to a pressure testing module and in series to a current testing module. It also includes an external computer, with both the pressure testing module and the current testing module electrically connected to the external computer. The fracture simulation module includes an electrolytic cell 8 containing an electrolyte 9 that simulates an oil layer and does not react with aluminum. The electrolytic cell 8 uses aluminum plates to simulate the supply boundary and horizontally arranged columnar aluminum 6 to simulate the horizontal section. Grooves are spaced around the columnar aluminum 6 at intervals along its horizontal extension direction. Aluminum sheets simulating vertical fractures 7 are fitted onto the sidewalls of the grooves at both ends. The aluminum sheets move along the horizontal extension direction of the columnar aluminum 6, with each movement distance being a multiple of the distance between adjacent grooves.

[0018] The specific implementation process of this utility model is as follows:

[0019] This invention simulates an oil layer in actual production using electrolyte 9, and uses horizontally positioned columnar aluminum 6 to simulate horizontal sections. Grooves are spaced around the columnar aluminum 6 at intervals along its horizontal extension direction. Aluminum sheets simulating vertical cracks 7 are fitted onto the sidewalls of the grooves at both ends. The aluminum sheets move along the horizontal extension direction of the columnar aluminum 6, and the grooves control their movement. The aluminum sheets move from one groove to another, simulating the adjustment of the spacing of the vertical cracks 7. Voltage values ​​are obtained through a pressure testing module, and current values ​​are obtained through a current testing module. A similarity criterion is used for transition and unification, converting current, voltage, and isobars into production, pressure, and isobars in the seepage field. This invention effectively links the hydroelectric simulation experiment with the actual reservoir conditions, minimizing experimental errors.

[0020] Example 2

[0021] Based on Embodiment 1, it also includes an aluminum wire to simulate the pulley 10. The aluminum sheet is wound around the groove by the aluminum wire to assist the movement of the aluminum sheet in the horizontal direction of the columnar aluminum 6.

[0022] Example 3

[0023] Based on Example 2, a frequency generator 11 is further provided between the outlet end of the crack simulation module and the power supply module to solve the polarization problem that easily occurs in the electrolyte 9 after prolonged energization, thereby reducing experimental errors and improving experimental accuracy. A voltage regulator 13 is also provided between the frequency generator 11 and the power supply module.

[0024] Example 4

[0025] Based on Embodiment 3, the power supply module includes a power supply 1 and a transformer 2 connected in sequence. The output end of the transformer 2 is connected to the input end of the crack simulation module, and the output end of the crack simulation module is connected to the power supply 1 in sequence via a frequency generator 11 and a voltage regulator 13. The power supply 1 provides 220V AC power, and the output voltage of the transformer 2 is greater than 6V.

[0026] Example 5

[0027] Based on Example 4, the pressure testing module is a voltmeter 4, and the current testing module is an ammeter 12, located on the connecting pipe between the frequency generator 11 and the voltage regulator 13. The electrolytic cell 8 is an electrolytic cell with a NaCl solution as the electrolyte 9. The electrolytic cell 8 is an organic glass cylinder with a diameter of 45cm and a height of 5cm; the columnar aluminum 6 has a diameter of 20mm and a length of 40cm; the aluminum sheet has a diameter of 0.5mm. The spacing between adjacent grooves is 1cm.

Claims

1. An experimental apparatus for simulating the generation of vertical fractures in a fractured horizontal well, comprising a circuit consisting of a power supply module and a fracture simulation module; characterized in that: The crack simulation module is connected in parallel with a pressure testing module and in series with a current testing module; it also includes an external computer, and both the pressure testing module and the current testing module are electrically connected to the external computer; the crack simulation module includes an electrolytic cell (8), the electrolytic cell (8) contains an electrolyte (9) for simulating an oil layer and not reacting with aluminum, the electrolytic cell (8) uses an aluminum plate strip to simulate the supply boundary, and uses horizontally arranged columnar aluminum (6) to simulate the horizontal section, and grooves are provided at intervals around the columnar aluminum (6) in the horizontal extension direction perpendicular to the columnar aluminum (6); aluminum sheets are sleeved on the sidewalls of the grooves at both ends to simulate vertical cracks (7), and the aluminum sheets move along the horizontal extension direction of the columnar aluminum (6), and the distance moved each time is a multiple of the distance between adjacent grooves.

2. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 1, characterized in that: It also includes aluminum wire to simulate a pulley (10), the aluminum sheet being wound around the groove by the aluminum wire.

3. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 2, characterized in that, A frequency generator (11) is also provided between the outlet end of the crack simulation module and the power supply module.

4. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 3, characterized in that, A voltage regulator (13) is also provided between the frequency generator (11) and the power supply module.

5. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 4, characterized in that, The power supply module includes a power supply (1) and a transformer (2) connected in sequence. The output end of the transformer (2) is connected to the input end of the crack simulation module. The output end of the crack simulation module is connected to the power supply (1) in sequence via a frequency generator (11) and a voltage regulator (13).

6. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 5, characterized in that, The power source (1) is a power source that provides 220V AC power, and the output voltage of the transformer (2) is greater than 6V.

7. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 6, characterized in that, The pressure testing module is a voltmeter (4), and the current testing module is an ammeter (12). The ammeter (12) is located on the connecting pipe between the frequency generator (11) and the voltage regulator (13).

8. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 1, characterized in that, The electrolytic cell (8) is an electrolytic cell (8) in which the electrolyte (9) is a NaCl solution.

9. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 1, characterized in that, The electrolytic cell (8) is an organic glass cylinder with a diameter of 45cm and a height of 5cm; the columnar aluminum (6) has a diameter of 20mm and a length of 40cm; the aluminum sheet has a diameter of 0.5mm.

10. The experimental apparatus for simulating the generation of vertical fractures in a horizontally fractured well according to claim 1, characterized in that, The distance between adjacent grooves is 1 cm.

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