CN108682270B - True triaxial fracturing simulation device for simulating proppant laying and working method thereof - Google Patents

Abstract

A true triaxial fracturing simulation device for simulating proppant laying and its working method belong to the technical field of oil and gas field development. The device comprises a fracturing fluid stirring tank connected in sequence with a main line, a fracturing pump, a proppant stirring tank, Fissure propagation simulation component, and integrated control system. The proppant stirred tank has parallel branch lines. There is a steering switch between the fracturing pump and the proppant stirring tank to control the connection and cutting of the main line, the proppant stirring tank and the branch pipeline; a metal threaded wellbore with certain deformation is installed inside the fracturing simulation rock sample. The invention improves the shape of the wellbore and the addition of fiber materials by adding a separate proppant adding device and a turning switch, improves the sealing strength between the wellbore and the contact surface of the rock sample, and can realize the simulation of sand addition during the crack initiation/expansion process. The purpose of improving the success rate of true triaxial fracturing laboratory experiments has important guiding significance for the study of proppant migration laws and the optimal design of fracturing construction plans.

Description

A true triaxial fracturing simulation device for simulating proppant placement and its working method

technical field

The invention relates to a true triaxial fracturing simulation device for simulating proppant laying and a working method thereof, belonging to the technical field of oil and gas field development.

Background technique

Unconventional oil and gas reservoirs in my country are widely distributed. Due to their low porosity and low permeability, the seepage resistance of oil and gas in the reservoir matrix is extremely large. Usually, fracturing stimulation technology is used to realize the economical and effective exploitation of low-permeability oil and gas reservoirs. . Hydraulic fracturing is a very complex stimulation and reconstruction process for oil and gas wells. The high-pressure pump set on the ground is used to pump the fracturing fluid into the well with a displacement exceeding the absorption capacity of the formation, and the high pressure is held up at the bottom of the well. When the pumping pressure overcomes the wellbore wall After the nearby in-situ stress reaches the tensile strength of the rock, fractures will occur at the bottom of the well; continue to pump the mixed liquid of fracturing fluid and proppant, which can form long enough sand-filled fractures with a certain conductivity in the formation to provide reservoirs. Fluid seepage channel.

In order to better study the initiation/expansion law of fracturing fractures in the reservoir, the laboratory usually uses concrete, cement, sandstone, coal rock and other materials to make fracturing rock samples to simulate the actual reservoir, and a wellbore device is installed inside the rock samples. The liquid is pumped into the rock sample through the wellbore, and high pressure is built up in the rock sample until the fracturing pressure is reached, which causes the rock sample to fracture.

According to the principle of hydraulic fracturing, the seal between the wellbore and the rock sample interface is the key to the success of the experiment. Once the seal is not tight, the liquid pumped into the rock sample will overflow along the interface between the wellbore and the rock sample, so that it cannot be held up at the bottom of the well. The high pressure prevents the rock sample from being fractured. In order to avoid the above problems, the laboratory usually adopts the method of reducing the diameter of the wellbore to 3-10mm (inner diameter of 1-8mm) to reduce the cement interface to improve the sealing between the wellbore and the rock sample, resulting in the wellbore being too thin to simulate pumping support agent fracturing process. In addition, the pressure range required for rock sample fracture is 20-80MPa, and the supporting fracturing pump is required to be a high-precision equipment that can provide higher pressure. Because the proppant particles are easy to wear the working vane or piston of the pump, the service life of the fracturing pump is reduced. Therefore, it is not suitable for pumping proppant material (the proppant material for fracturing is quartz sand or ceramsite particles with a particle size of 0.1-1.5 mm).

At present, due to the technical difficulties of sealing between the wellbore and the rock sample and the easy wear of the high-pressure pump, the success rate of the true triaxial fracturing laboratory experiment is low, and the fracture initiation/expansion and fracturing sand carrying process in the rock sample cannot be realized. Simultaneous simulation.

SUMMARY OF THE INVENTION

In order to solve the above problems of the prior art, the present invention provides a true triaxial fracturing simulation device for simulating proppant placement and a working method thereof.

The technical scheme of the present invention is as follows:

A true triaxial fracturing simulation device for simulating proppant laying is characterized in that a fracturing fluid stirring tank, a fracturing pump, a proppant stirring tank and a fracture propagation simulation component are sequentially connected through a main line, wherein the proppant The mixing tank is connected in parallel with branch pipelines that can be connected and cut off;

The fracturing fluid stirring tank includes a mixer inside, a fracturing fluid feed port is set on the upper part, and a discharge port is set at the bottom of the side to connect to the main line;

The inside of the proppant stirring tank includes a mixer, and the fracturing fluid feed port and the sand mixing fluid discharge port connected to the main line are respectively provided on the side, and the preferred position of the fracturing fluid feed port is higher than the sand mixing fluid discharge port;

The fracturing simulation component is surrounded by a fracturing simulation container, with a fracturing simulation rock sample inside, and a wellbore passing through the upper cover of the fracturing simulation container and communicating with the main line is installed inside the fracturing simulation rock sample. The contact surface of the fracturing simulated rock sample is distributed with perforation holes, and jacks are respectively connected to the front, rear, left, right and upper directions of the fracturing simulated rock sample;

Also includes an integrated control system.

Preferably, the inner wall surface of the fracturing fluid stirring tank is provided with a position measuring instrument for real-time observation of the liquid level position of the fracturing fluid in the tank; the fracturing fluid feeding port can be sealed with threads; the diameter of the fracturing fluid stirring tank is 1-80cm, height 1-80cm; the position of the discharge port set on the side is 0.1-30cm from the bottom of the tank.

Preferably, the diameter of the proppant stirring tank is 1-80 cm, and the height is 1-80 cm; the position of the sand mixing liquid outlet on the side is 0.1-30 cm from the bottom of the proppant stirring tank; the position of the fracturing liquid feeding port is higher than that of the sand mixing liquid The height difference of the discharge port is 0.1 to 50 cm.

Preferably, the fracturing pump is a plunger pump with a lift of 0.1-10 ⁴ kPa; an electromagnetic flowmeter is installed at the outlet of the fracturing pump.

Preferably, a steering switch is provided at the connection between the branch line and the main line.

Preferably, the raw material of the fracturing simulated rock sample includes fibers, the fibers have a length of 0.1-10 cm, and a fiber content of 1-60%.

Preferably, the wellbore is a metal wellbore with threads on the surface, the cross-section of the wellbore is circular or elliptical with axial twist, and the axial twist angle is 0-360°; the end of the wellbore is provided with a sealing cover; the circular cross-section The wellbore radius is 1-150mm; the short radius of the elliptical cross-section wellbore is 1-75mm, the ratio of the major axis to the minor axis is 1-2; the difference between the major diameter D and the minor diameter d of the wellbore surface thread is 0.1-5 cm, and the thread pitch is 0.1- 15 cm; the number of the wellbore is 1-5, the wellbore type is a vertical wellbore and/or a horizontal wellbore, and the wellbore length is 5-400 cm.

Preferably, the wellbore surface is uniformly or clustered with perforation holes, the hole diameter is 1-20mm, the hole phase is 0-180°, the hole density is 8-96 per m, and the number of holes is adjusted by nut sealing.

Preferably, the integrated control system controls the power switch of the fracturing pump, the electric mixer, and the jack device; the system control panel of the integrated control system is provided with the frequency adjustment button of the fracturing pump, the pressure adjustment button of the jack, the displacement display and the pressure indicator.

The working method of the aforementioned simulation device is characterized by comprising the following steps:

(1) Assemble the wellbore device, install the end sealing cover, and determine the hole density; preferably use a nut to seal the excess holes, and install the adapter on the top of the wellbore;

(2) Prepare raw materials including fibers, cement and/or concrete and/or coal and rock samples required for making rock samples, consolidate together with the wellbore to make reservoir simulation rock samples, and air dry the rock samples to the state required for the experiment;

(3) Install the rock sample and the wellbore to the inside of the fracturing simulation vessel, and fix the jacks on the front, rear, left, right and upper walls of the rock sample;

(4) Prepare the fracturing fluid system for the experiment and prepare the proppant material for fracturing;

(5) Arrange the laboratory, move the experimental equipment to a suitable location, connect all the experimental pipelines of the equipment, and check the tightness of the pipelines;

(6) Pour the fracturing fluid material into the fracturing fluid stirring tank, so that the liquid volume accounts for 80-90% of the tank volume; put the proppant material into the proppant stirring tank, so that the proppant volume accounts for 3-25% of the tank volume %;

(7) Start the jack device and set the confining pressure in the front and rear, left and right and up and down directions;

(8) Cut off the communication between the main line and the proppant stirring tank, connect the branch pipeline, and start the fracturing fluid electric mixer;

(9) Start the fracturing pump and adjust the frequency to the required displacement. The fracturing fluid is pumped into the wellbore by the fracturing pump, and the high pressure is raised inside the rock sample to cause the rock sample to be fractured;

(10) Observe the pressure change curve of the rock sample on the integrated control display interface, and judge whether the rock sample is fractured according to the curve;

(11) After fracturing the rock sample, start the proppant electric mixer;

(12) Connect the proppant stirring tank, close the branch pipeline, the fracturing fluid enters the proppant stirring tank, and after mixing with the proppant to form a sand-mixing fluid, it flows into the wellbore through the conversion joint and enters the artificial fracture in the rock sample;

(13) Repeat steps (8-12) to simulate the actual fracturing process on site;

(14) At the end of the experiment, turn off the fracturing pump, the electric mixer, and unload the pressure of the jack;

(15) Save and copy the experimental data, and close the integrated control system;

(16) Take out the simulated rock samples, observe the fracturing fracture expansion pattern, analyze the proppant placement law in the fractures, arrange the experimental instruments and materials, and clean the laboratory.

The effect of the present invention is as follows:

(1) The present invention adds a separate proppant adding device and a branch line that can be controlled by a steering switch, which can control the connection and disconnection between the main line and the proppant stirring tank; when the main line is connected to the proppant stirring tank, the fracturing fluid After the proppant mixing tank is mixed with the proppant to form the sand-carrying fluid, it is pumped into the wellbore together and flows into the artificial fractures formed inside the rock sample; otherwise, the fracturing fluid is separately pumped into the wellbore to open the fractures. In the process of true triaxial fracturing experiment, the simultaneous simulation of fracture initiation/expansion, fracturing sand-carrying process, and proppant placement can be realized in the rock sample, and the fracturing construction process of proppant slug can be simulated.

(2) The experimental device of the present invention can effectively improve the interface between the wellbore and the rock sample by improving the shape of the wellbore (from a smooth cylindrical wellbore to a threaded elliptical cylinder with a certain rotation angle) and adding fiber materials to the rock sample The sealing strength is improved, and the success rate of the true triaxial fracturing laboratory experiment is improved. According to the classic anchoring theory, the bonding force between metal rods and concrete mainly includes four types. Metal rods with different surface characteristics are subjected to different forces. The occlusal force with the concrete is generated, and in addition to the above three forces, the cold-rolled steel produces mechanical anchoring force due to surface protrusions, distortions or changes in the section geometry, so the cold-rolled steel can significantly enhance the bond strength with concrete; in addition, the The dispersed fibers are randomly and uniformly mixed into the cement or concrete by means of mechanical, air pressure or water pressure. Prevent lateral deformation of the structure, thereby improving the sealing effect between the metal rod and the concrete.

(3) The experimental device of the present invention can realize the integrated control of equipment switching, parameter adjustment, data display and data processing, and improve the safety of experimental operation.

(4) The experimental device of the present invention can realize "well factory" fracturing process simulation by installing different types (vertical or horizontal) and different numbers of wellbores, so as to better understand the effect of proppant in fracturing fractures (especially complex fractures). It has important guiding significance for the optimal design of the on-site fracturing construction scheme.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the device of the present invention;

The symbols in the figure are listed as follows:

1 fracturing fluid stirring tank; 2 electric mixer; 3 locator; 4 fracturing fluid inlet; 5 fracturing pump; 6 electromagnetic flowmeter; 7 proppant stirring tank; 8 proppant inlet; 9 main line ; 10 steering switches; 11 pipelines; 12 adapters; 13 fracturing simulation containers; 14 fracturing simulation rock samples; 15 jacks; 16 well bores; 17 sealing nuts; 18 universal wheels; 19 integrated control systems.

Detailed ways

The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

Example 1

A true triaxial fracturing simulation device for simulating proppant placement in this embodiment, as shown in FIG. 1 , is connected to a fracturing fluid stirring tank 1 , a fracturing pump 5 , and a proppant stirring tank 7 in sequence through the main line 9 . 2. Fracture propagation simulation component, wherein the proppant stirring tank is connected with branch pipelines in parallel, and the parallel interface is a steering switch 10; the fracturing fluid stirring tank 1 is provided with a fracturing fluid feed port 4 at the top, and a discharge port at the bottom of the side. Connected to the main line 9; the proppant stirring tank 7 includes a mixer 2 inside, and the fracturing fluid feed port and the sand mixing fluid discharge port connected to the main line are respectively set on the axial side, and the fracturing fluid feed port is located Above the outlet of the sand mixing liquid, there is a proppant inlet 8 at the top; the fracturing simulation container 13 is located on the periphery of the fracture propagation simulation component, and there is a fracturing simulation rock sample 14 inside, and the fracturing simulation rock sample 14 is installed with a The wellbore 16 which passes through the upper cover of the fracturing simulation vessel and communicates with the main line 9 , the contact surface of the wellbore 16 and the fracturing simulation rock sample 14 is distributed with perforations, before and after the fracturing simulation rock sample 14 The jacks 15 are respectively connected in the five directions of , left, right and upper; the integrated control system 19 is also included.

Threads are distributed on the surface of the wellbore 16, and the cross-section of the wellbore is elliptical, and a twist of 120° is applied in the axial direction to increase the bonding strength.

By adding a separate proppant adding device 7 and a pipeline diversion switch 10, and improving the shape of the wellbore 16, the sealing strength of the interface between the wellbore and the rock sample can be effectively improved, and the internal fracture initiation/expansion of the rock sample and the fracturing sand carrying process can be effectively improved. Simultaneously simulate and improve the experimental success rate of true triaxial fracturing.

An electric mixer 2 is installed in the center of the fracturing fluid stirring tank 1 and the proppant stirring tank 7, and a positioner 3 is installed close to the inner wall surface to observe the fracturing fluid level in the tank in real time; The diameter of the fracturing liquid stirring tank 1 and the proppant stirring tank 7 is 40cm and the height is 60cm; the position of the discharge port set on the side is 10cm away from the bottom of the tank, and the position of the fracturing liquid feeding port on the side of the proppant stirring tank is higher than the outlet of the sand mixing liquid. Material mouth, the height difference is 10cm.

The fracturing pump 5 is a high-precision plunger pump with a lift of 0.1-10 ⁴ kPa, and an electromagnetic flowmeter 6 is installed at the outlet; a pipeline steering switch 10 is arranged between the fracturing pump 5 and the proppant stirring tank 7 to control The branch pipeline is connected and cut off with the main line of the proppant stirring tank 7; when the main line 9 is connected to the proppant stirring tank 7, the fracturing fluid flows into the proppant stirring tank 7 and is mixed with the proppant to form a sand-mixing liquid, and then pumped into the wellbore 16. Flow into the artificial fractures formed inside the rock sample; on the contrary, the fracturing fluid is pumped into the wellbore alone to open the fractures.

The fracturing simulation container 13 is a cuboid container, and the box body and the upper cover are connected by nuts 17, and the number of the nuts is 4-8, preferably 6; the fracturing simulation container is 200cm long, 100cm wide, and 200cm high; Four universal wheels 18 are installed at the bottom of the container to facilitate the movement and transportation of the equipment.

The fracturing simulation rock sample 14 is in the shape of a cuboid, with a length of 80 cm, a width of 60 cm and a height of 80 cm. , using the jack device to provide confining pressure for the reservoir to simulate the stress state of the underground reservoir, the confining pressure in the front and rear, left and right and up and down directions is not necessarily the same. The fracturing simulated rock sample can be made of one or more materials in concrete, Portland cement, aluminate cement, gravel, sandstone, coal rock and other materials with fibers, respectively simulating different lithologies. or heterogeneous reservoirs of various lithologies.

A wellbore device is installed inside the fracturing simulated rock sample 14, the wellbore is a metal threaded wellbore 16, and the axial twist angle is 0-360°; the cross-section of the wellbore is ellipse, and the end of the wellbore is provided with a sealing cover to adjust the perforation holes traffic.

According to this embodiment, the difference between the major diameter D and the minor diameter d of the thread on the surface of the wellbore 16 is 3 cm, and the thread pitch is 10 cm; the short radius of the cross section of the wellbore is 50 mm, and the ratio of the long axis to the short axis is 1.5; the wellbore The quantity is 1, the wellbore type is vertical wellbore, and the wellbore length is 200cm.

Preferably according to this embodiment, the surface of the wellbore 16 is evenly distributed with perforation holes, the hole diameter is 5mm, the hole phase is 0-180°, and the hole density is 20/m, and the number of holes can be adjusted by nut sealing.

An adapter 12 is installed on the top of the wellbore device. The cross section of one end of the adapter 12 connected to the wellbore is oval, and is connected with the wellbore by threads; threaded connection;

The integrated control system 19 controls the power switch of the fracturing pump 5, the electric mixer 2, and the jack device 15; the integrated control system control panel is provided with a fracturing pump frequency adjustment button, a displacement display, and a rock sample internal pressure change display ; The control panel of the integrated control system is provided with a pressure adjustment button of the jack and a pressure display.

Example 2

The present embodiment is a working method of the above-mentioned equipment, including the following steps:

(1) Assemble the wellbore device 16, install the end sealing cover, determine the hole density, use nuts to seal the excess holes if necessary, and install the adapter 12 on the top of the wellbore;

(2) Prepare the raw materials required for the production of rock samples such as cement, concrete, coal rock, fibers, etc., consolidate together with the wellbore to make a certain size of reservoir simulation rock sample 14, and dry the rock sample to the state required for the experiment;

(3) Install the rock sample 14 and the wellbore 16 to the inside of the fracturing simulation container 13, and fix the jack 15 on the front, rear, left, right and upper walls of the rock sample;

(4) Prepare the fracturing fluid system for the experiment and prepare the proppant material for fracturing;

(5) Arrange the laboratory, move the experimental equipment to a suitable position, connect all the experimental pipelines 9 of the equipment, and check the tightness of the pipelines;

(6) Pour the fracturing fluid material into the fracturing fluid stirring tank 1, so that the liquid volume accounts for 80-90% of the tank volume; put the proppant material into the proppant stirring tank 7, so that the proppant volume accounts for 3 of the tank volume ~25%;

(7) Start the jack device 15, and set the size of the confining pressure in the front and rear, left and right and up and down directions;

(8) Rotate the pipeline steering switch 10, cut off the communication between the main pipeline and the proppant stirring tank, and start the fracturing fluid electric mixer 2;

(9) start the fracturing pump 5 and adjust the frequency to the required displacement, start the electromagnetic flowmeter 6, and the fracturing fluid is pumped into the wellbore 16 by the fracturing pump, and the high pressure inside the rock sample is held up to cause the rock sample to be fractured;

(10) Observe the rock sample pressure change curve on the display interface of the integrated control 19, and judge whether the rock sample is fractured according to the curve;

(11) After fracturing the rock sample, start the proppant electric mixer 2;

(12) Rotate the pipeline turning switch 10 to connect the pipeline with the proppant stirring tank. The fracturing fluid enters the proppant stirring tank, and is mixed with the proppant to form a sand-mixing fluid, which flows into the wellbore 16 through the conversion joint 12 and enters the artificial artificial in the rock sample. crack;

(13) Repeat steps (8-12) to simulate the actual fracturing process on site;

(14) After the experiment, turn off the pressure of the fracturing pump 5, the electric mixer 2, and the unloading jack 15 in turn;

(15) Save and copy the experimental data, and close the integrated control system 19;

(16) Take out the simulated rock samples, observe the fracturing fracture expansion pattern, analyze the proppant placement law in the fractures, arrange the experimental instruments and materials, and clean the laboratory.

The dimensions, materials, etc. in the above embodiments are only examples, and are not limited thereto. It can be further optimized in the following range, and the effect of the present invention can be achieved: the diameter of the fracturing fluid stirring tank is 30-80cm, and the height is 30-80cm; The diameter of the proppant stirring tank is 30-80 cm, and the height is 30-80 cm; the position of the sand mixing liquid discharge port on the side is 0.1-30 cm from the bottom of the proppant stirring tank; the position of the fracturing liquid feeding port is higher than the sand mixing liquid discharge The height difference of the mouth is 5-50 cm; the selected fracture expansion container has a three-dimensional size of 30-300 cm; the simulated rock sample used for fracture expansion has a three-dimensional size of 5-100 cm; the wellbore device used is a metal threaded wellbore with an axial twist angle. 0～360°; short radius of wellbore cross section is 1～75mm, ratio of long axis to short axis is 1～2; wellbore surface is clustered or perforated uniformly, perforation diameter is 1～20mm, perforation density is 16～48/m, perforation The phase is 0-90°; the number of the wellbore is 1-5, the wellbore type is vertical wellbore or horizontal wellbore, and the wellbore length is 5-400cm; the particle size of the proppant used is 20-100 mesh; the fracturing fluid adopts active water fracturing fluid, etc. .

Claims (10)

1. A true triaxial fracturing simulation device for simulating proppant laying is characterized in that a fracturing fluid stirring tank, a fracturing pump, a proppant stirring tank, a crack propagation simulation assembly are successively connected by the main line, wherein the The proppant stirring tank is connected in parallel with a branch line that can be connected and cut off in a controlled manner; The fracturing fluid stirring tank includes a mixer inside, a fracturing fluid feed port is set on the upper part, and a discharge port is set at the bottom of the side to connect to the main line; The inside of the proppant stirring tank includes a mixer, and the fracturing fluid inlet and the sand mixing fluid outlet connected to the main line are respectively arranged on the sides; The fracturing simulation component is surrounded by a fracturing simulation container, with a fracturing simulation rock sample inside, and a wellbore passing through the upper cover of the fracturing simulation container and communicating with the main line is installed inside the fracturing simulation rock sample. The contact surface of the fracturing simulated rock sample is distributed with perforation holes, and jacks are respectively connected to the front, rear, left, right and upper directions of the fracturing simulated rock sample; Also includes an integrated control system. 2. The simulation device according to claim 1, wherein the inner wall surface of the fracturing fluid stirring tank is provided with a locator for observing the fracturing fluid liquid level position in the tank in real time; the fracturing fluid stirring tank diameter 1-80cm, height 1-80cm; the position of the discharge port set on the side is 0.1-30cm from the bottom of the tank. 3. The simulation device according to claim 1, characterized in that the proppant stirring tank has a diameter of 1-80 cm and a height of 1-80 cm; the position of the sand mixing liquid discharge port on the side thereof is 0.1-30 cm from the bottom of the proppant stirring tank ; The height difference between the fracturing fluid inlet and the sand mixing fluid outlet is 0.1 to 50 cm. 4 . The simulation device according to claim 1 , wherein the fracturing pump is a plunger pump with a lift of 0.1-10 ⁴ kPa; an electromagnetic flowmeter is installed at the outlet of the fracturing pump. 5 . 5 . The simulation device according to claim 1 , wherein a steering switch is provided at the connection between the branch line and the main line. 6 . 6 . The simulation device according to claim 1 , wherein the raw material of the fracturing simulated rock sample comprises fibers, the fibers have a length of 0.1-10 cm, and a fiber content of 1-60%. 7 . 7 . The simulation device according to claim 1 , wherein the wellbore is a metal wellbore with threads on the surface, the cross-section of the wellbore is a circle or an ellipse with a twist in the axial direction, and the axial twist angle is 0-360° The end of the wellbore is provided with a sealing cover; the wellbore radius of the circular cross section is 1-150mm; the short radius of the elliptical cross-section wellbore is 1-75mm, and the ratio of the long axis to the short axis is 1 to 2; The difference between the small diameters d is 0.1-5 cm, and the thread pitch is 0.1-15 cm; the number of the wellbore is 1-5, the wellbore type is vertical wellbore and/or horizontal wellbore, and the wellbore length is 5-400 cm. 8 . The simulation device according to claim 7 , wherein the perforation holes are uniformly or clustered on the surface of the wellbore, the diameter of the holes is 1 to 20 mm, the phase of the holes is 0 to 180°, and the density of the holes is 8 to 96 pieces/m. The number of holes is adjusted by means of nut sealing. 9. The simulation device according to claim 1, characterized in that the integrated control system controls the power switch of the fracturing pump, the electric mixer and the jack device; the frequency of the fracturing pump is set on the system control panel of the integrated control system Adjustment buttons, pressure adjustment buttons for jacks, displacement display and pressure display. 10. The working method of the simulation device according to any one of claims 1-9, characterized in that it comprises the following steps: (1) Assemble the wellbore device, install the end sealing cover, and determine the hole density; (2) Prepare the raw materials required for the production of rock samples including fibers, consolidate together with the wellbore to make reservoir simulation rock samples, and dry the rock samples to the state required for the experiment; (3) Install the rock sample and the wellbore to the inside of the fracturing simulation vessel, and fix the jacks on the front, rear, left, right and upper walls of the rock sample; (4) Prepare the fracturing fluid system for the experiment and prepare the proppant material for fracturing; (5) Arrange the laboratory, move the experimental equipment to a suitable location, connect all the experimental pipelines of the equipment, and check the tightness of the pipelines; (6) Pour the fracturing fluid material into the fracturing fluid stirring tank, so that the liquid volume accounts for 80-90% of the tank volume; put the proppant material into the proppant stirring tank, so that the proppant volume accounts for 3-25% of the tank volume %; (7) Start the jack device and set the confining pressure in the front and rear, left and right and up and down directions; (8) Cut off the communication between the main line and the proppant stirring tank, connect the branch pipeline, and start the fracturing fluid electric mixer; (9) Start the fracturing pump and adjust the frequency to the required displacement. The fracturing fluid is pumped into the wellbore by the fracturing pump, and the high pressure is raised inside the rock sample to cause the rock sample to be fractured; (10) Observe the pressure change curve of the rock sample on the integrated control display interface, and judge whether the rock sample is fractured according to the curve; (11) After fracturing the rock sample, start the proppant electric mixer; (12) Connect the proppant stirring tank, close the branch pipeline, the fracturing fluid enters the proppant stirring tank, and after mixing with the proppant to form a sand-mixing fluid, it flows into the wellbore through the conversion joint and enters the artificial fracture in the rock sample; (13) Repeat steps (8) to (12) to simulate the actual fracturing process on site; (14) At the end of the experiment, turn off the fracturing pump, the electric mixer, and unload the pressure of the jack; (15) Save and copy the experimental data, and close the integrated control system; (16) Take out the simulated rock samples, observe the fracturing fracture expansion pattern, analyze the proppant placement law in the fractures, arrange the experimental instruments and materials, and clean the laboratory.