Experimental device for simulating dynamic invasion depth of working fluid into stratum

Abstract

The utility model discloses an experimental device for simulating the dynamic invasion depth of a working solution into a stratum. The experimental device comprises a pressure unit, a special long core holder and a data acquisition unit, the special long core holder comprises a holder barrel, a high-pressure-resistant rubber sleeve is arranged in the holder barrel, and a rubber sleeve plug and a rubber sleeve support are arranged at the two ends of the high-pressure-resistant rubber sleeve; the pressure unit comprises a pressure supply assembly and a pressure relief assembly, the pressure supply assembly comprises a high-precision displacement pump and a piston type intermediate container, and the pressure relief assembly comprises a pressure return pump and a liquid collecting device; the data collection unit comprises a data collection control device, the data collection control device is electrically connected with the infusion pressure sensor, the drainage pressure sensor, the bridge instrument and the temperature control device, and the multiple electrode pairs are arranged on the outer wall of the high-pressure-resistant rubber sleeve in the axial direction. The device can adapt to rock cores with different sizes, can accurately simulate a rock core experiment environment, and can accurately carry out an experiment on the dynamic invasion depth of a working solution into a stratum.

Description

Technical Field

[0001] This utility model relates to the field of experimental devices, and in particular to an experimental device for simulating the dynamic penetration depth of working fluid into the formation. Background Technology

[0002] Multi-stage horizontal well fracturing has become an important method for developing tight oil reservoirs. Fracturing significantly enhances reservoir permeability and improves oil recovery, making fracturing effectiveness evaluation a crucial step in tight oil reservoir development. The fracturing fluid penetration depth not only relates to the fracturing fluid sweep area but is also a parameter that must be considered in subsequent flowback production, and even plays a role in considering the absorption area during the shut-in phase. Therefore, penetration depth is undoubtedly an important indicator of fracturing effectiveness. However, the fracturing process is influenced by various geological and engineering factors, and the penetration depth of the fracturing fluid varies under different pressures and times, making it difficult to obtain a precise value for the penetration depth. Utility Model Content

[0003] The present invention aims to provide an experimental device for simulating the dynamic intrusion depth of working fluid into the formation. It can be adapted to cores of different sizes, accurately simulate the core experimental environment, and conduct experiments on the dynamic intrusion depth of working fluid into the formation with relatively accurate results.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] This utility model discloses an experimental device for simulating the dynamic intrusion depth of working fluid into the formation, including a pressure unit, a specially designed long core holder, and a data acquisition unit. The specially designed long core holder includes a horizontally arranged holder cylinder, which is connected to a confining pressure device and an air compressor. A high-pressure resistant rubber sleeve is coaxially installed inside the holder cylinder. Both ends of the high-pressure resistant rubber sleeve are connected to a rubber sleeve support through rubber sleeve plugs. A temperature control device is installed on the inner wall of the holder cylinder, and the rubber sleeve support is locked and fixed inside the temperature control device. A detachable plug at the cylinder opening is sealed to the head end of the holder cylinder, and a detachable plug at the cylinder tail is sealed to the tail end of the holder cylinder. A fluid delivery pipe passes through the cylinder opening plug, the rubber sleeve support, and the rubber sleeve plug, and connects to the high-pressure resistant rubber sleeve. A fluid discharge pipe passes through the tail end of the cylinder. The system includes a plug, a rubber sleeve support, and a rubber sleeve plug connected to a high-pressure resistant rubber sleeve; the pressure unit includes a pressure supply component and a pressure relief component. The pressure supply component includes a high-precision displacement pump and a piston-type intermediate container connected in sequence. The piston-type intermediate container is connected to the infusion pipeline. The pressure relief component includes a back pressure pump and a liquid collection device connected in sequence. The back pressure pump is connected to the drainage pipeline; the data acquisition unit includes a data acquisition and control device. The data acquisition and control device is electrically connected to an infusion pressure sensor, a drainage pressure sensor, an electrical bridge, and a temperature control device. The electrical bridge is electrically connected to an electrode controller. The electrode controller is electrically connected to electrode pairs through an electrode cluster. The infusion pressure sensor is connected to the infusion pipeline, and the drainage pressure sensor is connected to the drainage pipeline. Multiple electrode pairs are axially arranged on the outer wall of the high-pressure resistant rubber sleeve.

[0006] Preferably, the electrode cluster is fixed inside the cylinder mouth plug.

[0007] Preferably, the data collection and control device is electrically connected to the infusion pressure sensor and the drainage pressure sensor respectively through a pressure sensor controller.

[0008] Preferably, the bottom of the clamping cylinder is connected to a confining pressure device, and the top of the clamping cylinder is connected to an air compressor.

[0009] Preferably, there are 13 electrode pairs in total. The first to eighth electrode pairs are adjacent to each other at the same distance, and the eighth to thirteenth electrode pairs are adjacent to each other at the same distance, which is half the distance between the first to eighth electrode pairs.

[0010] Preferably, the back pressure pump is connected to the drain pipe via a back pressure device.

[0011] The beneficial effects of this utility model are:

[0012] This invention can be adapted to cores of different sizes, accurately simulate the core experimental environment, and accurately test the dynamic penetration depth of the working fluid into the formation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the present invention;

[0014] Figure 2 This is a cross-sectional view of a specially designed long core holder.

[0015] In the diagram: 1-Clamping device body, 2-Containing pressure device, 3-Air compressor, 4-High pressure resistant rubber sleeve, 5-Rubber sleeve plug, 6-Rubber sleeve bracket, 7-Temperature control device, 8-Cylinder mouth plug, 9-Cylinder tail plug, 10-Infusion pipeline, 11-Drainage pipeline, 12-High precision displacement pump, 13-Piston-type intermediate container, 14-Back pressure pump, 15-Liquid collection device, 16-Data collection and control device, 17-Infusion pressure sensor, 18-Drainage pressure sensor, 19-Bridge instrument, 20-Electrode controller, 21-Electrode cluster, 22-Electrode pair, 23-Pressure sensor controller, 24-Back pressure device. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings.

[0017] like Figure 1 , Figure 2As shown, this utility model includes a pressure unit, a specially designed long core holder, and a data acquisition unit. The specially designed long core holder includes a horizontally arranged holder cylinder 1, which is connected to a confining pressure device 2 and an air compressor 3. A high-pressure resistant rubber sleeve 4 is coaxially arranged inside the holder cylinder 1. Both ends of the high-pressure resistant rubber sleeve 4 are connected to a rubber sleeve support 6 through rubber sleeve plugs 5. A temperature control device 7 is provided on the inner wall of the holder cylinder 1. The rubber sleeve support 6 is locked and fixed inside the temperature control device 7. A cylinder mouth plug 8 is detachably and sealingly connected to the head end of the holder cylinder 1, and a cylinder tail plug 9 is detachably and sealingly connected to the tail end of the holder cylinder 1. An infusion pipe 10 passes through the cylinder mouth plug 8, the rubber sleeve support 6, and the rubber sleeve plug 5 and connects to the high-pressure resistant rubber sleeve 4. An infusion pipe 11 passes through the cylinder tail plug 9, the rubber sleeve support 6, and the rubber sleeve plug 5 and connects to the high-pressure resistant rubber sleeve 4. The pressure unit includes a pressure supply component and a pressure relief component. The pressure supply component includes a series of high-precision... The system includes a displacement pump 12, a piston-type intermediate container 13 connected to an infusion pipeline 10, a pressure relief assembly consisting of a back pressure pump 14 and a liquid collection device 15 connected in sequence, the back pressure pump 14 connected to a drain pipeline 11 via a back pressure device 24; a data acquisition unit including a data acquisition control device 16 electrically connected to an infusion pressure sensor 17, a drain pressure sensor 18, a bridge instrument 19, and a temperature control device 7, the bridge instrument 19 electrically connected to an electrode controller 20, the electrode controller 20 electrically connected to electrode pairs 22 via an electrode cluster 21, the electrode cluster 21 being fixed inside a cylinder stopper 8, the infusion pressure sensor 17 connected to the infusion pipeline 10, the drain pressure sensor 18 connected to the drain pipeline 11, multiple electrode pairs 22 axially arranged on the outer wall of a high-pressure resistant rubber sleeve 4, and the data acquisition control device 16 electrically connected to the infusion pressure sensor 17 and the drain pressure sensor 18 via a pressure sensor controller 23.

[0018] The electrode controller 20 achieves the connection of a single pair of electrodes 22 through a cyclic control switch, and then reads the resistance value of a single pair of electrodes 22 through the bridge instrument 19 connected to the electrode controller 20.

[0019] There are 13 electrode pairs 22 in total. The first to eighth electrode pairs 22 are equidistant from each other, and the eighth to thirteenth electrode pairs 22 are equidistant from each other and are half the equidistant distance of the first to eighth electrode pairs 22. The high-pressure resistant rubber sleeve 4 is a high-pressure resistant structure, and can be configured in the following four types according to the diameter of the core being adapted:

[0020] 1. Diameter 2.5cm, length 100cm, wherein the distance between adjacent electrodes 22 from the first to the eighth is 10cm, the distance between adjacent electrodes from the eighth to the thirteenth is 5cm, and the distance between the first electrode pair 22 and the end of the high-pressure resistant rubber sleeve 4 is 10cm.

[0021] 2. Diameter 2.5cm, length 50cm, wherein the distance between adjacent electrodes 22 from the first to the eighth is 5cm, the distance between adjacent electrodes from the eighth to the thirteenth is 2.5cm, and the distance between the first electrode pair 22 and the end of the high-pressure resistant rubber sleeve 4 is 10cm.

[0022] 3. Diameter 5cm, length 100cm, wherein the distance between adjacent electrodes 22 from the first to the eighth is 10cm, the distance between adjacent electrodes from the eighth to the thirteenth is 5cm, and the distance between the first electrode pair 22 and the end of the high-pressure resistant rubber sleeve 4 is 10cm.

[0023] 4. Diameter 5cm, length 50cm, where the distance between adjacent electrodes 22 from the first to the eighth is 5cm, the distance between adjacent electrodes from the eighth to the thirteenth is 2.5cm, and the distance between the first electrode pair 22 and the end of the high-pressure resistant rubber sleeve 4 is 10cm.

[0024] The bottom of the clamp cylinder 1 is connected to the confining pressure device 2, which is electrically connected to the data collection and control device 16 to add the confining pressure required for the unloading experiment. The top of the clamp cylinder 1 is connected to the air compressor 3, which uses gas as a pressure source. After the experiment, the confining pressure device 2 is unloaded and the air compressor 3 is turned on to fully clean the hydraulic fluid in the clamp cylinder 1, so as to prevent the hydraulic fluid from flowing out when the experimental device is dismantled.

[0025] In actual use, the specific steps are as follows:

[0026] 1. Sampling and Placement: Select the required model of high-pressure resistant rubber sleeve 4 and place the rock sample to be used in the experiment into the high-pressure resistant rubber sleeve 4.

[0027] 2. Place the working solution: Pour the required working solution into the piston-type intermediate container 13;

[0028] 3. Connection device: After installing rubber sleeve plugs 5 at both ends of the high-pressure resistant rubber sleeve 4 and connecting the rubber sleeve bracket 6, put the clamping device cylinder 1 in and install the cylinder mouth plug 8 and cylinder tail plug 9. After ensuring that the high-pressure resistant rubber sleeve 4 is tightly fitted with the rubber sleeve plugs 5 at both ends, put the high-pressure resistant rubber sleeve 4 into the appropriate position of the clamping device cylinder 1 and install the cylinder mouth plug 8 and cylinder tail plug 9 to close the device. The head and tail ends of the specially made long core clamping device are respectively connected to the piston-type intermediate container 13 and the pressure relief component.

[0029] IV. Set up the environment by loading the required confining pressure, back pressure, and temperature through the data collection and control device 16.

[0030] 5. Start the simulation, turn on the high-precision displacement pump 12, and start the experiment with constant pressure or constant speed according to the required injection method. Start the resistance cyclic acquisition through the numerical control device.

[0031] VI. End the simulation. After completing the experiment, turn off the high-precision displacement pump 12, unload the confining pressure, back pressure, and temperature through the data collection and control device 16, and collect and process the discharged liquid.

[0032] 7. Dismantle the device and clean it.

[0033] 8. Data processing: Processing and analyzing relevant experimental data.

[0034] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. An experimental apparatus for simulating the dynamic penetration depth of working fluid into formations, characterized in that: Includes a pressure unit, a specially designed long core holder, and a data acquisition unit; The specially designed long core holder includes a horizontally arranged holder cylinder (1), which is connected to a confining pressure device (2) and an air compressor (3). A high-pressure resistant rubber sleeve (4) is coaxially installed inside the holder cylinder (1). Both ends of the high-pressure resistant rubber sleeve (4) are connected to a rubber sleeve bracket (6) through rubber sleeve plugs (5). A temperature control device (7) is installed on the inner wall of the holder cylinder (1), and the rubber sleeve bracket (6) is engaged and fixed to the temperature control device (7). Inside, the cylinder mouth plug (8) is a detachable sealing connection to the head end of the clamp cylinder (1), the cylinder tail plug (9) is a detachable sealing connection to the tail end of the clamp cylinder (1), the infusion pipeline (10) passes through the cylinder mouth plug (8), the rubber sleeve bracket (6), the rubber sleeve plug (5) and connects to the high pressure resistant rubber sleeve (4), the drain pipeline (11) passes through the cylinder tail plug (9), the rubber sleeve bracket (6), the rubber sleeve plug (5) and connects to the high pressure resistant rubber sleeve (4); The pressure unit includes a pressure supply component and a pressure relief component. The pressure supply component includes a high-precision displacement pump (12) and a piston intermediate container (13) connected in sequence. The piston intermediate container (13) is connected to the infusion pipeline (10). The pressure relief component includes a back pressure pump (14) and a liquid collection device (15) connected in sequence. The back pressure pump (14) is connected to the drainage pipeline (11). The data acquisition unit includes a data collection and control device (16), which is electrically connected to an infusion pressure sensor (17), a drainage pressure sensor (18), an electrical bridge (19), and a temperature control device (7). The electrical bridge (19) is electrically connected to an electrode controller (20), which is electrically connected to an electrode pair (22) via an electrode cluster (21). The infusion pressure sensor (17) is connected to an infusion pipeline (10), and the drainage pressure sensor (18) is connected to a drainage pipeline (11). Multiple electrode pairs (22) are axially arranged on the outer wall of a high-pressure resistant rubber sleeve (4).

2. The experimental apparatus according to claim 1, characterized in that: The electrode cluster (21) is fixed inside the cylinder stopper (8).

3. The experimental apparatus according to claim 1, characterized in that: The data collection and control device (16) is electrically connected to the infusion pressure sensor (17) and the drainage pressure sensor (18) respectively through the pressure sensor controller (23).

4. The experimental apparatus according to claim 1, characterized in that: The bottom of the clamping cylinder (1) is connected to the confining pressure device (2), and the top of the clamping cylinder (1) is connected to the air compressor (3).

5. The experimental apparatus according to claim 1, characterized in that: There are 13 electrode pairs (22). The first to eighth electrode pairs (22) are adjacent to each other at the same distance. The eighth to thirteenth electrode pairs (22) are adjacent to each other at the same distance and are half the distance between the first to eighth electrode pairs (22).

6. The experimental apparatus according to claim 1, characterized in that: The back pressure pump (14) is connected to the drain pipe (11) through the back pressure device (24).

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