Calibration system for oxygen activation water flow logging instrument

Abstract

The utility model provides a calibration system for an oxygen activation water flow logging instrument. The calibration system comprises a water supply system and a simulation device. The sleeve structure comprises an inner pipe and an outer pipe; the outer pipe is coaxially nested outside the inner pipe, so that a loop space is formed between the outer surface of the inner pipe and the inner surface of the outer pipe; wherein the clear water tank is communicated with a water inlet of the simulation device, and unactivated water in the clear water tank is conveyed to the loop space to be activated by the oxygen activation water flow logging instrument; a water outlet of the simulation device is communicated with the activation water tank, and activated water in the loop space is conveyed to the activation water tank; the activation water tank is communicated with the clear water tank, and activated and inactivated water in the activation water tank is conveyed to the clear water tank. Water in the clear water tank flows back to the activation water tank for temporary storage after passing through the loop space in the simulation device, water in the activation water tank flows into the clear water tank after being inactivated, and cyclic utilization of the water is achieved. Multiple repeated experiments can be carried out in a short time, multiple calibration experiments can be continuously carried out, and the instrument calibration efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well logging, in particular to the technical field of a calibration system for an oxygen-activated water flow logging instrument. Background Art

[0002] The pulsed neutron oxygen activation logging tool is a well logging instrument used to measure water flow velocity. It consists of a neutron generator and a characteristic gamma-ray detector. The neutron generator emits neutrons, activating oxygen in the aqueous solution within the wellbore. If the water is flowing, the gamma-ray detector detects the water flow signal, thereby measuring the water flow velocity. Specifically, the fast neutrons produced by the neutron generator irradiate the oxygen (16O) in the fluid, producing the radioactive isotope 16N. After β-decay, the 16N emits high-energy gamma rays with an energy of 6.13 MeV. These gamma rays are high enough to penetrate the metal materials of the wellbore and be detected by the detector. Pulsed oxygen activation logging is a synthetic technique that measures the flow velocity of the liquid within the pipe using a short excitation period (1-15 seconds) followed by a long acquisition period (20-60 seconds). The short excitation period allows detection of the signal as the flowing water passes the detector. The measured water velocity is determined by the source distance from the detector and the time it takes for the water to pass through the detector. If the source distance of a detector is known, the flow velocity can be determined by measuring the transit time of the water through the detector. After the flow velocity is obtained, the water flow rate in this section can be calculated in combination with the cross-sectional area of the annulus in the well.

[0003] The patent "A Pulse Oxygen Activation Logging Autocorrelation Interpretation Method and Apparatus" (CN 108086970 A) describes a calibration device and method for this type of instrument. This device simulates downhole pipeline conditions using inner and outer casings, with water flowing continuously within the annular spaces of the two casings. During calibration testing, the instrument is located within the inner casing, and calibration is performed using this simulation device. Some manufacturers also use similar calibration devices. However, these calibration devices all have the following disadvantages:

[0004] 1. The water tanks are all single-tank designs. Since the water flow after passing through the simulation device has been activated by fast neutrons, it cannot flow back into the water tank directly, otherwise it will cause errors in the instrument measurement. Therefore, the water output of the simulation device of the single-tank calibration device is generally discharged directly; such a design determines that the calibration system can only perform one calibration experiment during a single experiment. The emptying of the water in the water tank means the end of a single calibration experiment. Because the water tank volume is limited, the effective calibration time of the single-tank system is subject to the effective volume of the water tank. This also determines that the traditional calibration device can only complete the simulation of some small flow environments. When the flow rate is large, the water in the water tank may only support the calibration experiment for about 60 seconds, and only one complete measurement cycle can be carried out.

[0005] 2. Traditional calibration systems are all fixed flow calibration, without flow regulation devices, that is, the water flow of the entire calibration system remains unchanged and flow regulation cannot be performed. Utility Model Content

[0006] The main purpose of the utility model is to provide a calibration system for an oxygen-activated water flow logging instrument, so as to at least solve the problem in the prior art that the calibration time is limited due to the limited capacity of the water tank.

[0007] In order to achieve the above-mentioned object, the utility model provides a calibration system for an oxygen-activated water flow logging instrument, comprising a water supply system and a simulation device; the water supply system is used to provide water required for testing, and the water supply system includes a clean water tank and an activated water tank; the clean water tank is used to temporarily store unactivated water; the activated water tank is used to temporarily store activated water; the simulation device includes a casing structure and a fixing structure; the casing structure includes an inner tube and an outer tube; the outer tube is coaxially nested outside the inner tube to form an annular space between the outer surface of the inner tube and the inner surface of the outer tube; the fixing structure is used to fix the inner tube and the outer tube;

[0008] Among them, the clean water tank is connected to the water inlet of the simulation device, and the unactivated water in the clean water tank is transported to the annulus space to be activated by the oxygen-activated water flow logging instrument; the water outlet of the simulation device is connected to the activated water tank, and the activated water in the annulus space is transported to the activated water tank; the activated water tank is connected to the clean water tank, and the water in the activated water tank that is activated and then deactivated is transported to the clean water tank.

[0009] Furthermore, the calibration system also includes a control system, which includes a controller, a flow meter and an electronically controlled regulating valve; the flow meter is provided at the water outlet of the clean water tank and is electrically connected to the controller; the flow meter is used to monitor the water flow rate of the clean water tank; the electronically controlled regulating valve is provided between the clean water tank and the flow meter and is electrically connected to the controller; the electronically controlled regulating valve is used to control the water flow rate of the clean water tank;

[0010] The flow meter is further configured to transmit the monitored flow information to the controller, and the controller is configured to control the opening of the electrically controlled regulating valve according to the flow information to control the water outflow of the clean water tank.

[0011] Furthermore, the control system further includes a liquid level sensor system, the liquid level sensor system including a first liquid level sensor and a second liquid level sensor; the first liquid level sensor is disposed in the clean water tank and electrically connected to the controller, and is configured to send a first message to the controller when the liquid level in the clean water tank reaches a set first liquid level; the second liquid level sensor is disposed in the activated water tank and electrically connected to the controller, and is configured to send a second message to the controller when the liquid level in the activated water tank reaches a set second liquid level;

[0012] The controller is further configured to stop the water in the clean water tank from being transported outwards when the first information is received; and to start the water in the clean water tank from being transported outwards when the second information is received.

[0013] Furthermore, the calibration system further comprises a water pump, which is used to transport the water in the clean water tank outward;

[0014] The water pump is electrically connected to the controller, and the controller is also used to control the water pump to be turned on and off.

[0015] Furthermore, the activated water tank is arranged above the clean water tank, and the water supply system also includes an electrically controlled ball valve; the electrically controlled ball valve is arranged on the water supply pipeline between the activated water tank and the clean water tank, and the electrically controlled ball valve is electrically connected to the controller, and the electrically controlled ball valve is used to control the conduction and closing of the water supply pipeline under the control of the controller.

[0016] Furthermore, the simulation device also includes two adapter structures; the two adapter structures are sleeved on the two ends of the outer side of the inner tube, and one end of the two adapter structures is respectively sealed and connected to the two ends of the outer tube, and the two adapter structures are respectively used to introduce test water into the annular space and lead it out from the annular space.

[0017] Furthermore, the fixing structure includes two sealing flanges, a plurality of screws and two clamping rings; the two sealing flanges are respectively arranged between the adapter structure and the end of the inner tube; the two sealing flanges are used to fix the inner tube to the outside of the inner tube; the plurality of screws respectively pass through the sealing flanges and the adapter structure, and the plurality of screws are used to fix the adapter structure, the sealing flanges and the sleeve structure together; the two clamping rings are respectively used to fix the two adapter structures to the outer surface of the inner tube;

[0018] The two clamping rings are respectively installed on the outer sides of the ends of the inner tube, and the two clamping rings are respectively connected to the ends of the two adapters located at the inner tube through threads.

[0019] Furthermore, the simulation device also includes a plurality of sealing structures; the plurality of sealing structures are respectively arranged at the junctions between the clamping ring, the adapter structure, the inner tube, the outer tube and the sealing flange.

[0020] Furthermore, the inner tube and the outer tube are both made of hard polyvinyl chloride.

[0021] A calibration system for an oxygen-activated water flow logging instrument using the technical solution of the present invention comprises a water supply system and a simulation device. The water supply system is used to provide water required for testing, and the water supply system comprises a clean water tank and an activated water tank. The clean water tank is used to temporarily store unactivated water; the activated water tank is used to temporarily store activated water; the simulation device comprises a casing structure and a fixed structure. The casing structure comprises an inner tube and an outer tube. The outer tube is coaxially nested outside the inner tube to form an annular space between the outer surface of the inner tube and the inner surface of the outer tube. The fixed structure is used to fix the inner tube and the outer tube. The clean water tank is connected to the water inlet of the simulation device, and the unactivated water in the clean water tank is transported to the annular space to be activated by the oxygen-activated water flow logging instrument. The water outlet of the simulation device is connected to the activated water tank, and the activated water in the annular space is transported to the activated water tank. The activated water tank is connected to the clean water tank, and the activated and then deactivated water in the activated water tank is transported to the clean water tank. The water in the clean water tank flows through the annular space in the simulation device and then returns to the activated water tank for temporary storage. After deactivation, the water in the activated water tank flows back to the clean water tank, achieving water recycling. This allows for repeated experiments and continuous calibration experiments to be performed in a short period of time, improving the efficiency of instrument calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of a calibration system for an oxygen-activated water flow logging instrument that can be selected according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a simulation device that can be selected according to an embodiment of the present utility model;

[0025] Figure 3 It is a schematic diagram of the fixed structure D in the simulation device according to an optional embodiment of the present utility model;

[0026] Figure 4Detailed schematic diagram of area A in an optional simulation device according to an embodiment of the present utility model;

[0027] Figure 5 Detailed schematic diagram of area B in an optional simulation device according to an embodiment of the present utility model;

[0028] Figure 6 It is a detailed schematic diagram of area C in the simulation device that can be selected according to an embodiment of the present utility model.

[0029] The above drawings include the following reference numerals:

[0030] 10. Water supply system; 11. Clean water tank; 12. Activated water tank; 13. Electric-controlled ball valve; 20. Simulation device; 21. Casing structure; 211. Inner tube; 212. Outer tube; 22. Fixing structure; 221. Sealing flange; 222. Screw; 223. Clamping ring; 23. Adapter structure; 24. Sealing structure; 30. Control system; 31. Controller; 32. Flow meter; 33. Electric-controlled regulating valve; 40. Water pump. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] like Figure 1 、 Figure 2 As shown, a calibration system for an oxygen-activated water flow logging instrument includes: a water supply system 10 and a simulation device 20; the water supply system 10 is used to provide water required for testing, and the water supply system 10 includes a clean water tank 11 and an activated water tank 12, the clean water tank 11 is used to temporarily store unactivated water, and the activated water tank 12 is used to temporarily store activated water; the simulation device 20 includes a casing structure 21 and a fixing structure 22. The casing structure 21 includes an inner tube 211 and an outer tube 212; the outer tube 212 is coaxially nested outside the inner tube 211 to be fixed to the inner tube 21. An annular space is formed between the outer surface of 1 and the inner surface of the outer tube 212; the fixing structure 22 is used to fix the inner tube 211 and the outer tube 212; wherein, the clean water tank 11 is connected to the water inlet of the simulation device 20, and the unactivated water in the clean water tank 11 is transported to the annular space and activated by the oxygen-activated water flow logging instrument; the water outlet of the simulation device 20 is connected to the activated water tank 12, and the activated water in the annular space is transported to the activated water tank 12; the activated water tank 12 is connected to the clean water tank 11, and the water in the activated water tank 12 that is activated and then deactivated is transported to the clean water tank 11.

[0033] Specifically, the outer tube 212 is used to simulate downhole casing, and the inner tube is used to simulate oil pipes. The annular space formed by the inner and outer casings is connected to the water pipeline. The inner tube 211 has open ends. During the experiment, the oxygen-activated water flow logging instrument is placed in the inner tube 211. During the experiment, water from the clean water tank 11 first enters the simulation device 20, and the flow rate of the water in the simulation device 20 is constant. The oxygen-activated water flow logging instrument inside the simulation device 20 measures the flow rate of the incoming water. During the measurement process, the neutron generator in the oxygen-activated water flow logging instrument emits neutrons, activating the oxygen elements in the water. The gamma-ray detector detects the flow signal of the water, and then measures the flow rate of the water. In other words, the water passing through the simulation device 20 is activated. After a period of time, the activated water will return to its normal "inactivated" state and can continue to be used for testing. The water from the simulation device 20 is transported to the activated water tank 12. The water, which has just entered the activated water tank 12, is still in an "activated" state. After a period of deactivation in the activated water tank 12, it is then re-transported to the clean water tank 11 for continued testing. Therefore, after the water in the activated water tank 12 is deactivated, it re-enters the clean water tank 11, allowing the test to continue. This application utilizes a dual-tank design, enabling water recycling, supporting simulation calibration experiments in larger flow environments, and enabling multiple calibration experiments to be conducted continuously, while conserving resources.

[0034] In this application, the clean water tank 11 and the activated water tank 12 have the same volume, about 1.1m 3 Water volume.

[0035] In a possible embodiment, the calibration system also includes a control system 30, which includes: a controller 31, a flow meter 32 and an electrically controlled regulating valve 33; the flow meter 32 is arranged at the water outlet of the clean water tank 11 and is electrically connected to the controller 31; the flow meter 32 is used to monitor the water outlet flow of the clean water tank 11; the electrically controlled regulating valve 33 is arranged between the clean water tank 11 and the flow meter 32, and is electrically connected to the controller 31; the electrically controlled regulating valve 33 is used to control the water outlet flow of the clean water tank 11; wherein, the flow meter 32 is also used to transmit the monitored flow information to the controller 31, and the controller 31 is used to control the opening of the electrically controlled regulating valve 33 according to the flow information to control the water outlet flow of the clean water tank 11.

[0036] Specifically, the calibration system also uses a control system 30. The control system 30 is a PID control system, which includes a controller 31 and a relay. The controller 31 is a PID intelligent controller. The flow meter 32 collects real-time flow information in the water delivery pipe. The real-time flow information in the water delivery pipe is the water flow delivered to the simulation device 20, and the flow information is converted into a 4-20mA current signal and transmitted to the controller 31. The PID intelligent controller compares the monitored water outlet flow of the clean water tank 11 with the preset water outlet flow of the clean water tank 11, and then uses the PID control method to accurately control the opening amount of the electronically controlled regulating valve 33, thereby realizing precise control of the water flow entering the simulation device 20.

[0037] In one possible embodiment, the control system 30 further includes a liquid level sensor system, which includes a first liquid level sensor and a second liquid level sensor. The first liquid level sensor is disposed in the clean water tank 11 and electrically connected to the controller 31. Upon detecting that the liquid level in the clean water tank 11 has reached a predetermined first level, the first liquid level sensor sends a first message to the controller 31. The second liquid level sensor is disposed in the activated water tank 12 and electrically connected to the controller 31. Upon detecting that the liquid level in the activated water tank 12 has reached a predetermined second level, the second liquid level sensor sends a second message to the controller 31. The controller 31 is further configured to stop the flow of water out of the clean water tank 11 upon receiving the first message and to start the flow of water out of the clean water tank 11 upon receiving the second message.

[0038] Specifically, the control system 30 also includes a liquid level sensor system. The liquid level sensor system includes a first liquid level sensor disposed in the clean water tank 11 and a second liquid level sensor disposed in the activated water tank 12. The first liquid level sensor and the second liquid level sensor are both electrically connected to the controller 31. As the test progresses, the water level in the clean water tank 11 first drops. When the first liquid level sensor detects a preset low water level signal, it sends it to the controller 31. The controller 31 controls the water in the clean water tank 11 to stop being transported outward. At the same time, the controller 31 starts a 30-second countdown. After 30 seconds, all the water to be entered into the activated water tank 12 is deactivated. The controller 31 controls the water in the activated water tank 12 to enter the clean water tank 11. When the second liquid level sensor detects that the water level in the activated water tank 12 has dropped to a low liquid level, a signal that the activated water tank 12 has reached a low water level is sent to the controller 31. The controller 31 controls the activated water tank 12 to stop discharging water.

[0039] Through the precise control of the liquid level sensor system, it can be ensured that after all the water in the activated water tank 12 is deactivated, it will be transported back to the clean water tank 11 for continued use, thereby realizing the recycling of water and the continuity of the experiment, improving the efficiency and accuracy of the experiment.

[0040] In one possible embodiment, the calibration system further includes a water pump 40, which is used to transport water from the clean water tank 11. The water pump 40 is electrically connected to the controller 31, and the controller 31 is also used to control the water pump 40 to be turned on and off.

[0041] Specifically, the water pump 40 is disposed between the water outlet of the clean water tank 11 and the electrically controlled regulating valve 33. The water pump 40 pumps water from the clean water tank 11 into the delivery pipe. The water pump 40 is electrically connected to the controller 31. The controller 31 controls the flow of clean water out of the clean water tank 11 and stops the flow of clean water out of the clean water tank 11 by turning the water pump 40 on and off.

[0042] In one possible embodiment, the activated water tank 12 is disposed above the clean water tank 11, and the water supply system 10 further includes an electrically controlled ball valve 13. The electrically controlled ball valve 13 is disposed on the water supply pipeline between the activated water tank 12 and the clean water tank 11. The electrically controlled ball valve 13 is electrically connected to a controller 31 and is used to control the opening and closing of the water supply pipeline under the control of the controller 31.

[0043] Specifically, activated water tank 12 is positioned above clean water tank 11. With electrically controlled ball valve 13 open, water in activated water tank 12 flows directly into clean water tank 11 below under the influence of gravity. Placing activated water tank 12 above clean water tank 11 optimizes spatial layout, making the entire water supply system more compact and space-saving. Furthermore, electrically controlled ball valve 13 enables the water supply system to control the outlet of activated water tank 12 according to commands from controller 31.

[0044] In one possible embodiment, the simulation device 20 further includes two adapter structures 23. The two adapter structures 23 are mounted on both ends of the outer side of the inner tube 211. One end of the two adapter structures 23 is sealedly connected to both ends of the outer tube 212, respectively. The two adapter structures 23 are used to introduce test water into the annular space and to lead it out of the annular space.

[0045] Specifically, if Figure 2 As shown, the adapter structure 23 is provided so that the test water can be easily introduced into and led out of the annular space without complicated operations or additional equipment, and the equipment installation is more flexible.

[0046] In one possible embodiment, the fixing structure 22 includes two sealing flanges 221, multiple screws 222, and two compression rings 223. The two sealing flanges 221 are respectively disposed between the adapter structure 23 and the ends of the inner tube 211; the two sealing flanges 221 are used to fix the inner tube 211 to the outside of the inner tube 211; the multiple screws 222 respectively pass through the sealing flanges 221 and the adapter structure 23, and the multiple screws 222 are used to fix the adapter structure 23, the sealing flanges 221, and the sleeve structure 21 together. The two compression rings 223 are respectively used to fix the two adapter structures 23 to the outer surface of the inner tube 211;

[0047] The two clamping rings 223 are respectively installed on the outer sides of the ends of the inner tube 211 , and the two clamping rings 223 are respectively connected to the ends of the two adapters located at the inner tube 211 through threads.

[0048] Specifically, if Figure 2 As shown, the two sealing flanges 221 provide a first sealing barrier for the connection between the inner tube 211 and the adapter structure 23. The sealing flange 221, the clamping ring 223 and the inner tube 211 are all coaxially arranged. The clamping ring 223 further fixes the adapter structure through a threaded connection, ensuring the tightness of the seal and providing a second sealing guarantee. The double seal reduces the risk of leakage and improves the safety and reliability of the system. In addition, Figure 3 is a D-direction schematic diagram of the fixed structure 22, as shown in FIG. Figure 3 Multiple screws 222 pass through the sealing flange 221 and the adapter structure 23 along the axial direction of the inner tube 211. The multiple screws 222 are evenly distributed along the radial direction of the sealing flange 221, which enhances the stability of the system and improves its ability to resist vibration and impact.

[0049] In a possible embodiment, the simulation device 20 further includes a plurality of sealing structures 24 ; the plurality of sealing structures 24 are respectively arranged at the interfaces among the clamping ring 223 , the adapter structure 23 , the inner tube 211 , the outer tube 212 and the sealing flange 221 .

[0050] Specifically, the detailed schematic diagram of area A in the simulation device 20 is as follows: Figure 4 As shown, the first sealing structure 24 is provided at the junction of the outer surface of the inner tube 211, the chamfered corner of the end face of the adapter structure 23, and the end face of the clamping ring 223; the detailed schematic diagram of the B area in the simulation device 20 is shown in FIG. Figure 5 As shown, a second sealing structure 24 is provided at the joint between the end of the adapter structure 23 away from the end face of the inner tube 211 and the outer surface of the inner tube 211; a detailed schematic diagram of the C area in the simulation device 20 is shown in FIG. Figure 6As shown, the sealing flange 221 contacts the adapter structure 23 and a third sealing structure 24 is provided in the gap between the screw 222 and the outer tube 212; a fourth sealing structure 24 is provided between the end face of the outer tube 212 and the contact surface of the sealing flange 221; and a fifth sealing structure is provided between the outer surface of the outer tube 212 and the contact surface of the sealing flange 221. The first, second, and fifth sealing structures 24, 24 are all in the form of O-rings, and the third and fourth sealing structures 24, 24 are both in the form of gaskets. By providing sealing structures at the intersections between the clamping ring 223, the adapter structure 23, the inner tube 211, the outer tube 212, and the sealing flange 221, good sealing properties can be ensured at the connections between these components, avoiding potential leakage problems during the calibration process and ensuring the stability and accuracy of the calibration test.

[0051] In a possible implementation, the inner tube 211 and the outer tube 212 are both made of rigid polyvinyl chloride.

[0052] Specifically, the inner tube 211 and the outer tube 212 are both made of rigid polyvinyl chloride. Rigid polyvinyl chloride has high hardness and rigidity, can withstand certain pressure and load, and ensure the stability and safety of the pipeline system.

[0053] Further illustrate by the following examples:

[0054] Example 1:

[0055] Reference Figure 1 As shown, an oxygen-activated water flow logging tool calibration system is provided with:

[0056] Clean water tank 11, activated water tank 12, water pump 40, electronically controlled regulating valve 33, flow meter 32, simulation device 20, electronically controlled ball valve 13, supporting pipelines and control system 30, etc.

[0057] The water outlet of the clean water tank 11 is connected to a water pump 40, an electronically controlled regulating valve 33, a flow meter 32, and a simulation device 20 in sequence through pipelines. The water outlet of the simulation device 20 is connected to the water inlet of the activated water tank 12 through a return pipe.

[0058] The activated water tank 12 is located above the clean water tank 11, and the water outlet of the activated water tank 12 is connected to the water inlet of the clean water tank 11 through an electric control ball valve 13. Liquid level sensors are installed in both the clean water tank 11 and the activated water tank 12.

[0059] Flowmeter 32 collects analog signals of the flow rate in the outlet pipe of clean water tank 11 and transmits them to control system 30. Control system 30 implements closed-loop PID control of the calibration system flow rate by controlling the opening of electronically controlled regulating valve 33. The calibration device is controlled by a PLC, achieving fully automated control of the calibration process.

[0060] This calibration system has the following technical parameters or characteristics:

[0061] The clean water tank 11 and the activated water tank 12 have the same volume, about 1.1m 3 Water capacity. Pump 40 effective water flow rate is about 50m 3 / h, with a power consumption of approximately 5.5 kW. Both inner pipe 211 and outer pipe 212 are made of UPVC. The UPV pipe serving as inner pipe 211 is DN50 UPVC, similar in size to common 2-3 / 8" oil pipes. The UPV pipe serving as outer pipe 212 is DN125 UPVC, similar in size to common 5-1 / 2" casing pipes. All components in the pipeline are connected via DN80 stainless steel flanged metal hoses.

[0062] Table 3 Comparison of sizes of DN50-UPVC pipe, DN125-UPVC pipe, 2-3 / 8 oil pipe and 5-1 / 2 casing

[0063]

[0064] In combination with the above-mentioned simulation device of specific size and technical conditions, the flow rate in the simulation device 20 under typical flow value conditions and the maximum duration corresponding to a single calibration experiment are shown in Table 4.

[0065] Table 4 Flow rate in the simulation device 20 and the maximum duration corresponding to a single calibration experiment

[0066]

[0067] Example 2:

[0068] The workflow of the calibration system is as follows:

[0069] Step 1: Fix the equipment in place and connect all pipes correctly. Insert the oxygen-activated water flow logging instrument into the inner hole of the inner tube 211 of the simulation device 20. Fill the clean water tank 11 with water and confirm that the electric control ball valve 13 is in the closed state.

[0070] Step 2: Power on the oxygen-activated water flow logging instrument for preheating and applying high pressure until the oxygen-activated water flow logging instrument is in a stable state;

[0071] Step 3: Power on the calibration system, set the preset flow rate of the clean water tank 11 to start the calibration system and start it running;

[0072] Step 4: The water in the clean water tank 11 passes through the water pump 40, the electronically controlled regulating valve 33, the flow meter 32, and the annular space of the simulation device 20 and returns to the activated water tank 12. At this time, the water that has just entered the activated water tank 12 is still in an "activated" state;

[0073] Step 5: As the water level in the clean water tank 11 drops, the first liquid level sensor detects a low water level signal, the PLC controller 31 controls the water pump 40 to stop, and the PLC controller 31 enters a 30-second countdown;

[0074] Step 6: After the 30-second timer ends, the PLC controller 31 controls the opening of the electric ball valve 13, and the "deactivated" water in the activated water tank 12 flows into the clean water tank 11;

[0075] Step 7: As the water level in the activated water tank 12 drops, the second liquid level sensor detects a low water level signal, and the PLC controller 31 controls the electric ball valve 13 to close while the water pump 40 starts;

[0076] Step 8: Repeat steps 4 to 8 until the calibration experiment is completed;

[0077] Step 9: End of the experiment.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A calibration system for an oxygen-activated water flow logging instrument, characterized in that: include: A water supply system (10) is used to provide water required for testing, and the water supply system (10) includes: The clean water tank (11) is used to temporarily store unactivated water; the activated water tank (12) is used to temporarily store activated water; A simulation device (20), comprising: A sleeve structure (21) comprises an inner tube (211) and an outer tube (212); the outer tube (212) is coaxially nested outside the inner tube (211) to form an annular space between the outer surface of the inner tube (211) and the inner surface of the outer tube (212); a fixing structure (22) for fixing the inner tube (211) and the outer tube (212); The clean water tank (11) is connected to the water inlet of the simulation device (20), and the unactivated water in the clean water tank (11) is transported to the annular space to be activated by the oxygen-activated water flow logging instrument; the water outlet of the simulation device (20) is connected to the activated water tank (12), and the activated water in the annular space is transported to the activated water tank (12); the activated water tank (12) is connected to the clean water tank (11), and the water in the activated water tank (12) that is activated and then deactivated is transported to the clean water tank (11).

2. A calibration system for an oxygen-activated water flow logging instrument according to claim 1, characterized in that: The calibration system further comprises a control system (30), wherein the control system (30) comprises: Controller (31); a flow meter (32), the flow meter (32) being arranged at the water outlet of the clean water tank (11) and being electrically connected to the controller (31); the flow meter (32) being used to monitor the water outlet flow of the clean water tank (11); an electrically controlled regulating valve (33), the electrically controlled regulating valve (33) being arranged between the clean water tank (11) and the flow meter (32) and being electrically connected to the controller (31); the electrically controlled regulating valve (33) being used to control the water outflow of the clean water tank (11); The flow meter (32) is further configured to transmit the monitored flow information to the controller (31), and the controller (31) is configured to control the opening of the electrically controlled regulating valve (33) according to the flow information to control the water outflow of the clean water tank (11).

3. A calibration system for an oxygen-activated water flow logging instrument according to claim 2, characterized in that: The control system (30) further includes a liquid level sensor system, wherein the liquid level sensor system includes: a first liquid level sensor disposed in the clean water tank (11) and electrically connected to the controller (31), the first liquid level sensor being configured to send first information to the controller (31) when detecting that the liquid level in the clean water tank (11) reaches a set first liquid level; a second liquid level sensor disposed in the activated water tank (12) and electrically connected to the controller (31), the second liquid level sensor being configured to send second information to the controller (31) when detecting that the liquid level in the activated water tank (12) reaches a set second liquid level; The controller (31) is further configured to control the water in the clean water tank (11) to stop being transported outward when the first information is received; and the controller (31) is further configured to control the water in the clean water tank (11) to start being transported outward when the second information is received.

4. A calibration system for an oxygen-activated water flow logging instrument according to claim 3, characterized in that: The calibration system further comprises a water pump (40), and the water pump (40) is used to transport the water in the clean water tank (11) outward; The water pump (40) is electrically connected to the controller (31), and the controller (31) is also used to control the water pump (40) to be turned on and off.

5. A calibration system for an oxygen-activated water flow logging instrument according to claim 4, characterized in that: The activated water tank (12) is arranged above the clean water tank (11), and the water supply system (10) further comprises an electrically controlled ball valve (13); The electrically controlled ball valve (13) is arranged on the water supply pipeline between the activated water tank (12) and the clean water tank (11), and the electrically controlled ball valve (13) is electrically connected to the controller (31). The electrically controlled ball valve (13) is used to control the conduction and closing of the water supply pipeline under the control of the controller (31).

6. A calibration system for an oxygen-activated water flow logging instrument according to claim 1, characterized in that: The simulation device (20) further includes two adapter structures (23); The two adapter structures (23) are sleeved on the two ends of the outer side of the inner tube (211), and one end of the two adapter structures (23) is sealedly connected to the two ends of the outer tube (212) respectively. The two adapter structures (23) are used to introduce test water into the annular space and lead it out from the annular space respectively.

7. A calibration system for an oxygen-activated water flow logging instrument according to claim 6, characterized in that: The fixing structure (22) comprises: Two sealing flanges (221), the two sealing flanges (221) being respectively arranged between the adapter structure (23) and the end of the inner tube (211); the two sealing flanges (221) being used to fix the inner tube (211) to the outside of the inner tube (211); a plurality of screw rods (222), the plurality of screw rods (222) respectively passing through the sealing flange (221) and the adapter structure (23), and the plurality of screw rods (222) being used to fix the adapter structure (23), the sealing flange (221) and the sleeve structure (21) together; Two compression rings (223), the two compression rings (223) are respectively used to fix the two adapter structures (23) to the outer surface of the inner tube (211); The two clamping rings (223) are respectively installed on the outside of the end of the inner tube (211), and the two clamping rings (223) are respectively connected to the ends of the two adapters located on the inner tube (211) through threads.

8. A calibration system for an oxygen-activated water flow logging instrument according to claim 7, characterized in that: The simulation device (20) further includes a plurality of sealing structures (24); The plurality of sealing structures (24) are respectively arranged at the interfaces between the clamping ring (223), the adapter structure (23), the inner tube (211), the outer tube (212) and the sealing flange (221).

9. The calibration system for oxygen-activated water flow logging instrument according to claim 1, characterized in that: The inner tube (211) and the outer tube (212) are both made of hard polyvinyl chloride.

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