Measurement device for predicting crustal stress sensitivity coefficient of tight sandstone oil gas

Abstract

The utility model discloses a compact sandstone oil gas prediction crustal stress sensitivity coefficient measuring device, which comprises a measuring device main body, a compact sandstone sample, a pressure applying piece and a liquid outlet channel, a measuring table is arranged at the bottom end in the measuring device main body, and the compact sandstone sample is placed at the central position of the top of the measuring table; pressure applying pieces are arranged on the portions, on the two sides of the compact sandstone sample, of the measuring table, a liquid inlet pipe and a liquid outlet pipe are arranged on one sides of the pressure applying pieces correspondingly, pressure sensors are arranged on the liquid inlet pipe and the liquid outlet pipe correspondingly, a booster pump is arranged outside the measuring device body, the booster pump is connected with the liquid inlet pipe through a high-pressure pipeline, and the liquid inlet pipe is connected with the liquid outlet pipe through a high-pressure pipeline. And a Coriolis force mass flowmeter is arranged at one end of the liquid outlet pipe. By installing the measuring device main body, the compact sandstone sample, the pressure applying piece, the liquid inlet pipe, the liquid outlet pipe, the booster pump, the connecting pipe and the liquid outlet, the real stress state of an underground reservoir can be simulated, so that the measuring result is more accurate.

Description

Technical Field

[0001] This utility model relates to the field of tight sandstone measurement technology, specifically a device for measuring the geostress sensitivity coefficient of tight sandstone oil and gas prediction. Background Technology

[0002] Tight sandstone is a common reservoir rock. The geostress sensitivity coefficient of tight sandstone generally refers to the degree of influence of geostress on the physical properties of the rock. Since changes in geostress affect the storage and flow of oil and gas, the geostress sensitivity coefficient is very important in oil and gas exploration and development. Measuring the geostress sensitivity coefficient can help us understand the impact of geostress on the migration and accumulation of oil and gas, and help us predict the distribution and enrichment patterns of oil and gas reservoirs.

[0003] When measuring the geostress sensitivity coefficient of tight sandstone, pressure is usually applied to the rock mass first, and the strain distribution of the rock core is captured in real time through distributed optical fibers to monitor the strain. However, tight sandstone is a porous medium containing pores. The fluid pressure in these pores can also affect the mechanical behavior of the rock. If the pore pressure cannot be controlled during the measurement, it may affect the accuracy of the geostress sensitivity coefficient measurement results. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring the geostress sensitivity coefficient of tight sandstone oil and gas prediction, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a measuring device for predicting the geostress sensitivity coefficient of tight sandstone oil and gas, comprising a measuring device body, a tight sandstone sample, a pressure-applying component, and a liquid outlet channel. A measuring platform is provided at the bottom of the measuring device body, and a tight sandstone sample is placed at the center of the top of the measuring platform. Pre-set grooves are uniformly formed on the top surface of the tight sandstone sample, and distributed optical fibers are embedded inside each of the grooves. Pressure-applying components are provided on both sides of the measuring platform of the tight sandstone sample, and an inlet pipe and an outlet pipe are respectively provided on one side of each pressure-applying component. Pressure sensors are installed on both the inlet and outlet pipes. A booster pump is provided outside the measuring device body, and the booster pump is connected to the inlet pipe via a high-pressure pipeline. A Coriolis mass flow meter is provided at one end of the outlet pipe, and a liquid outlet channel is uniformly formed inside the pressure-applying component. The ends of the inlet and outlet pipes near the pressure-applying component are uniformly connected to the outlet channel via connecting pipes. A controller is provided on the top of one side of the measuring device body.

[0006] Preferably, heating elements are provided on both sides of the inside of the measuring device body, and a temperature sensor is provided on one side of the inside of the measuring device body.

[0007] Preferably, a purification chamber is provided at the top of the main body of the measuring device, and a blower is provided at the top of the purification chamber.

[0008] Preferably, the measuring device body outside the blower is provided with an intercepting net, and the bottom of the purification box is provided with an air distribution grid.

[0009] Preferably, a filter screen is provided at the center of the purification box, and slide rails are provided at both ends of the filter screen. Slide grooves matching the slide rails are provided on both sides of the purification box.

[0010] Preferably, a bidirectional lead screw is provided at the top of the measuring platform, and both ends of the bidirectional lead screw are fitted with movable sleeves, the tops of which are connected to the pressure-applying component.

[0011] Preferably, a drive motor is fixed to the bottom end of one side of the main body of the measuring device, and the output end of the drive motor is connected to a bidirectional lead screw.

[0012] Preferably, a guide rod is provided at the bottom of the measuring platform, and the bottom of each movable sleeve is connected to the guide rod through the guide sleeve.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This device for measuring the geostress sensitivity coefficient of tight sandstone oil and gas prediction consists of a main body, a tight sandstone sample, a pressure-applying component, an inlet pipe, an outlet pipe, a booster pump, connecting pipes, and an outlet. The booster pump is located outside the main body and connected to the inlet pipe via a high-pressure pipeline. Fluid is injected into the tight sandstone sample before the pressure-applying component applies pressure to the sample to increase pore pressure. The fluid enters the outlet channel through the connecting pipe and disperses throughout the tight sandstone sample, increasing the diffusion channels and allowing the fluid to distribute more quickly to all parts of the core, thus improving the efficiency of experiments or tests. A Coriolis mass flow meter is installed on the outlet pipe. By monitoring the flow rate changes, the controller dynamically adjusts the booster pump output to gradually reach the target pore pressure value. Pressure sensors are installed on both the inlet and outlet pipes to monitor the pore pressure in real time during the pressure increase process, ensuring the accuracy and safety of the adjustment. By simulating and controlling the pore pressure, the actual stress state of the underground reservoir can be simulated, making the measurement results more representative and accurate. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a frontal cross-sectional view of the present invention.

[0017] Figure 2 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0018] Figure 3 This is a side view of the pressure-applying component of this utility model.

[0019] Figure 4 This is a top view schematic diagram of the dense sandstone sample of this utility model;

[0020] Figure 5 This is a schematic diagram of the purification box structure of this utility model.

[0021] In the diagram: 1. Main body of the measuring device; 2. Purification chamber; 3. Blower; 4. Temperature sensor; 5. Heating element; 6. Booster pump; 7. Inlet pipe; 8. Pressure sensor; 9. Dense sandstone sample; 10. Measuring platform; 11. Drive motor; 12. Outlet pipe; 13. Pressure application component; 14. Controller; 15. Bidirectional lead screw; 16. Movable sleeve; 17. Guide rod; 18. Outlet channel; 19. Connecting pipe; 20. Preset tank; 21. Distributed optical fiber; 22. Interception net; 23. Filter screen; 24. Slide rail; 25. Air distribution grid; 26. Coriolis mass flow meter. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figure 1-5 The present invention provides an embodiment of a device for measuring the geostress sensitivity coefficient of tight sandstone oil and gas prediction, comprising a measuring device body 1, a tight sandstone sample 9, a pressure application component 13 and a liquid outlet channel 18. A measuring platform 10 is provided at the bottom of the measuring device body 1, and a tight sandstone sample 9 is placed at the center of the top of the measuring platform 10.

[0024] Pressure-applying components 13 are provided on both sides of the measuring platform 10 of the dense sandstone sample 9. A two-way screw 15 is provided at the top inside the measuring platform 10, and movable sleeves 16 are sleeved on both ends of the two-way screw 15. The top of the movable sleeves 16 are connected to the pressure-applying components 13.

[0025] A drive motor 11 is fixed to the bottom of one side of the main body 1 of the measuring device, and the output end of the drive motor 11 is connected to the bidirectional lead screw 15.

[0026] The dense sandstone sample 9 to be measured is placed on the measuring table 10. The bidirectional lead screw 15 is rotated by the drive motor 11, so that the movable sleeves 16 are brought closer to each other, thereby driving the pressure application component 13 to apply pressure to the dense sandstone sample 9.

[0027] The bottom of the measuring table 10 is provided with a guide rod 17, and the bottom of the movable sleeve 16 is connected to the guide rod 17 through the guide sleeve to guide and limit the movable sleeve 16.

[0028] The top surface of the dense sandstone sample 9 is uniformly provided with preset grooves 20, and each preset groove 20 is embedded with a distributed optical fiber 21. After the dense sandstone sample 9 is subjected to force, the strain distribution of the dense sandstone sample 9 is captured in real time through the distributed optical fiber 21, thereby performing strain monitoring.

[0029] The pressure-applying component 13 is provided with an inlet pipe 7 and an outlet pipe 12 on one side. Both the inlet pipe 7 and the outlet pipe 12 are equipped with pressure sensors 8. The main body 1 of the measuring device is equipped with a booster pump 6, which is connected to the inlet pipe 7 via a high-pressure pipeline. One end of the outlet pipe 12 is equipped with a Coriolis mass flow meter 26.

[0030] Before applying pressure to the dense sandstone sample 9 using the pressure-applying component 13, fluid is injected into the dense sandstone sample 9 to increase the pore pressure;

[0031] Furthermore, the interior of the pressure-applying component 13 is uniformly provided with liquid outlet channels 18, and the end of the liquid inlet pipe 7 and the liquid outlet pipe 12 near the pressure-applying component 13 is uniformly connected to the liquid outlet channels 18 through the connecting pipe 19.

[0032] The fluid enters the outlet channel 18 through the connecting pipe 19 and is dispersed in the dense sandstone sample 9. This can increase the diffusion channels of the fluid in the dense sandstone sample 9, allowing the fluid to be distributed to various parts of the dense sandstone sample 9 more quickly, which helps to improve the efficiency of experiments or tests.

[0033] A controller 14 is installed on the top of one side of the main body 1 of the measuring device, and a Coriolis mass flow meter 26 is installed on the outlet pipe 12. By monitoring the flow rate change, the controller 14 dynamically adjusts the output of the booster pump 6 to gradually reach the target pore pressure value. Pressure sensors 8 are installed on the inlet pipe 7 and the outlet pipe 12 respectively. During the process of increasing the pore pressure, the pore pressure is monitored in real time to ensure the accuracy and safety of the adjustment. By simulating and controlling the pore pressure, the real stress state of the underground reservoir can be simulated, making the measurement results more representative and accurate.

[0034] Heating elements 5 are provided on both sides inside the main body 1 of the measuring device, and a temperature sensor 4 is provided on one side inside the main body 1 of the measuring device. The heating elements 5 generate heat after being powered on, and the temperature sensor 4 is used to control the temperature to simulate the high temperature conditions in the strata. This helps to understand the geostress sensitivity characteristics of dense sandstone in high temperature environment more accurately.

[0035] A purification box 2 is installed at the top of the main body 1 of the measuring device, and a blower 3 is installed at the top of the purification box 2.

[0036] An intercepting net 22 is installed on the main body 1 of the measuring device outside the blower 3, and an air distribution grid 25 is installed at the bottom of the purification box 2. When the blower 3 is running, the external airflow is distributed inside the main body 1 of the measuring device through the air distribution grid 25, which can be used to promote the circulation of gas inside the main body 1 of the measuring device to ensure the uniformity and stability of the measurement environment.

[0037] A filter screen 23 is installed in the center of the purification box 2. When external airflow enters, it is filtered and purified through the filter screen 23 to keep the measurement environment free from pollution. Both ends of the filter screen 23 are equipped with slide rails 24. The two sides inside the purification box 2 are provided with slide grooves that match the slide rails 24, which facilitates the replacement of the filter screen 23.

[0038] The specific models and specifications of the blower 3, temperature sensor 4, heating element 5, booster pump 6, pressure sensor 8, drive motor 11, and controller 14 need to be determined by selection calculation based on the specifications and parameters of the device. The selection calculation method is existing technology, so it will not be described in detail.

[0039] Working Principle: In this embodiment, the dense sandstone sample 9 to be measured is placed on the measuring platform 10. The drive motor 11 drives the bidirectional lead screw 15 to rotate, causing the movable sleeves 16 to move closer together. This drives the pressure applying component 13 to apply pressure to the dense sandstone sample 9. Pre-set grooves 20 are uniformly opened on the surface of the dense sandstone sample 9. Distributed optical fibers 21 are installed in the grooves 20 to capture the strain distribution of the dense sandstone sample 9 in real time, thereby performing strain monitoring. The booster pump 6 is located outside the main body 1 of the measuring device and is connected to the inlet pipe 7 through a high-pressure pipeline. Before the pressure applying pressure to the dense sandstone sample 9 by the pressure applying component 13, fluid is injected into the dense sandstone sample 9 to increase the pore pressure. The fluid enters the outlet channel 18 through the connecting pipe 19 and is dispersed in the dense sandstone sample 9, which can increase the diffusion channels of the fluid in the dense sandstone sample 9, allowing the fluid to be distributed to all parts of the dense sandstone sample 9 more quickly. The system helps improve the efficiency of experiments or tests. A Coriolis mass flow meter 26 is installed on the outlet pipe 12. By monitoring the flow rate change, the controller 14 dynamically adjusts the output of the booster pump 6 to gradually reach the target pore pressure value. Pressure sensors 8 are installed on the inlet pipe 7 and the outlet pipe 12 respectively. During the process of increasing the pore pressure, the pore pressure is monitored in real time to ensure the accuracy and safety of the adjustment. By simulating and controlling the pore pressure, the real stress state of the underground reservoir can be simulated, making the measurement results more representative and accurate. In addition, the heating element 5 generates heat after being powered on to simulate the high temperature conditions in the strata. This helps to more accurately understand the geostress sensitivity characteristics of tight sandstone under high temperature environment. At the same time, the operation of the blower 3 can be used to promote the circulation of gas in the main body 1 of the measuring device to ensure the uniformity and stability of the measurement environment. When the external airflow enters, it is filtered and purified through the filter screen 23 to keep the measurement environment free from pollution.

[0040] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring the geostress sensitivity coefficient in tight sandstone oil and gas prediction, characterized in that, The device includes a main measuring device (1), a dense sandstone sample (9), a pressure-applying component (13), and a liquid outlet channel (18). A measuring platform (10) is located at the bottom of the main measuring device (1), and the dense sandstone sample (9) is placed at the center of the top of the measuring platform (10). Pre-set grooves (20) are evenly distributed on the top surface of the dense sandstone sample (9), and distributed optical fibers (21) are embedded inside each of the pre-set grooves (20). Pressure-applying components (13) are located on both sides of the measuring platform (10) of the dense sandstone sample (9), and an inlet pipe (7) and an outlet pipe (12) are respectively located on one side of each pressure-applying component (13). Pressure sensors (8) are provided on both the inlet pipe (7) and the outlet pipe (12). A booster pump (6) is provided on the outside of the main body (1) of the measuring device, and the booster pump (6) is connected to the inlet pipe (7) through a high-pressure pipeline. A Coriolis mass flow meter (26) is provided at one end of the outlet pipe (12), and an outlet channel (18) is uniformly opened inside the pressure application component (13). The inlet pipe (7) and the outlet pipe (12) are uniformly connected to the outlet channel (18) through a connecting pipe (19) at the end near the pressure application component (13). A controller (14) is provided on the top of one side of the main body (1) of the measuring device.

2. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 1, characterized in that: Heating elements (5) are provided on both sides inside the main body (1) of the measuring device, and a temperature sensor (4) is provided on one side inside the main body (1) of the measuring device.

3. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 1, characterized in that: The top of the main body (1) of the measuring device is equipped with a purification box (2), and the top of the purification box (2) is equipped with a blower (3).

4. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 3, characterized in that: An intercepting net (22) is provided on the measuring device body (1) outside the blower (3), and an air distribution grid (25) is provided at the bottom of the purification box (2).

5. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 3, characterized in that: A filter screen (23) is provided in the center of the purification box (2), and slide rails (24) are provided at both ends of the filter screen (23). Slide grooves matching the slide rails (24) are provided on both sides of the purification box (2).

6. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 1, characterized in that: The measuring platform (10) has a bidirectional lead screw (15) at its top, and both ends of the bidirectional lead screw (15) are fitted with movable sleeves (16), the top of which is connected to the pressure member (13).

7. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 6, characterized in that: A drive motor (11) is fixed at the bottom of one side of the main body (1) of the measuring device, and the output end of the drive motor (11) is connected to the bidirectional lead screw (15).

8. The device for measuring the geostress sensitivity coefficient for predicting oil and gas in tight sandstone according to claim 6, characterized in that: The bottom of the measuring platform (10) is provided with a guide rod (17), and the bottom of the movable sleeve (16) is connected to the guide rod (17) through the guide sleeve.

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