A distributed optical fiber monitoring fluid response experimental device and method

Abstract

The present invention relates to a distributed optical fiber monitoring fluid response experimental device and method, wherein the distributed optical fiber monitoring fluid response experimental device is used for signal transmission through a distributed optical fiber, and includes: a production system, including a sand storage tank, a gas storage tank, a water storage tank and an oil storage tank; a plurality of mixers, and the feed ends of the mixers are communicated with the production system; a flow system, including a casing with side walls communicated with the discharge ends of the plurality of mixers, an oil pipe arranged in the casing and forming an annulus relative to the casing, and a plurality of detection components communicated with the side walls of the casing, wherein the casing is horizontally or vertically arranged and both ends are closed; and a signal processing system, which is signal-connected to the other end of the distributed optical fiber. By adopting the technical solution of the present invention, accurate monitoring of oil well liquid production, gas profile, sand production and wellbore leakage under different optical fiber arrangement modes, different working conditions in the oil well and different medium conditions can be realized, and quantitative evaluation of the oil well can be carried out through test indexes.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field development, and particularly to a distributed optical fiber monitoring fluid response experimental device and method. Background Art

[0002] In recent years, the demand for monitoring and transformation of unconventional wells such as horizontal wells and directional wells has increased sharply. However, during the development of unconventional wells, due to the complex and variable formation conditions, strong heterogeneity, and unclear development status of natural fractures, the development effect often fails to meet the expected requirements. Therefore, how to improve the accuracy of oil and gas well production status evaluation has become the core issue in the development of unconventional resources.

[0003] Distributed optical fiber monitoring technology can dynamically monitor the oil and gas field development in a timely and accurate manner and quantitatively evaluate the production status of oil and gas wells. Therefore, it is widely applied in oilfield on-site construction. However, there is still a lack of an experimental device and method that can simulate the multi-phase flow, gas production, sand production, leakage, etc. in an oil well on the ground to make a quantitative evaluation of the liquid production (oil-water mixture), gas profile, sand production, and wellbore leakage of the oil well in combination with test indexes, so as to provide theoretical verification and support for oilfield on-site construction. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a distributed optical fiber monitoring fluid response experimental device and method, which can accurately monitor the liquid production, gas profile, sand production, and wellbore leakage of an oil well under different optical fiber arrangement modes, different working conditions in the oil well, and different medium conditions, and make a quantitative evaluation of the oil well through test indexes.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] On the one hand, the present invention provides a distributed optical fiber monitoring fluid response experimental device for signal transmission through a distributed optical fiber, further comprising:

[0007] An output system, including a sand storage tank, a gas storage tank, a water storage tank, and an oil storage tank;

[0008] A plurality of mixers, each of which has a feed end connected to the sand storage tank, the gas storage tank, the water storage tank, and the oil storage tank;

[0009] A flow system, including a casing with side walls connected to the discharge ends of the plurality of mixers, a tubing disposed inside the casing and forming an annulus relative to the casing, and a plurality of detection components connected to the side walls of the casing. The casing is horizontally or vertically arranged and both ends are closed. One end of the distributed optical fiber is located inside the tubing, or between the tubing and the casing, or outside the casing. The number of the plurality of detection components is equal to the number of the plurality of mixers and they are arranged in one-to-one correspondence;

[0010] and a signal processing system, with the signal connected to the other end of the distributed optical fiber.

[0011] The beneficial effects of the present invention are as follows: By using sleeves that can be set horizontally or vertically to simulate horizontal wells or vertical shafts, and at the same time, by setting up a sand storage tank, a gas storage tank, a water storage tank, and an oil storage tank, and using a mixer to inject different sands, gases, waters, and oils into the sleeve, simulating situations such as downhole water production, oil and gas profiles, sand production, and wellbore leakage, quantitative measurements under different substances and different displacement conditions can be achieved. Through multiple experiments, it can provide basic experimental data for the iterative upgrade of the distributed optical fiber interpretation model; and further, by experimentally comparing the differences in monitoring among three different distributed optical fiber arrangement methods, namely, inside the tubing, between the tubing and the sleeve, and on the outer wall of the sleeve, it provides a basis for the selection of optical fiber arrangement methods for different monitoring purposes in the later stage, so as to accurately monitor the liquid production, gas profile, sand production, and wellbore leakage of oil wells under different optical fiber arrangement methods, different well conditions in the oil well, and different medium conditions, and quantitatively evaluate the oil well through experimental indicators.

[0012] On the basis of the above technical solutions, the present invention can be further improved as follows.

[0013] Further, the production system further includes four groups of control components. The feeding ends of the four groups of control components are respectively connected to the output ends of the sand storage tank, the gas storage tank, the water storage tank, and the oil storage tank. Each group of control components includes a plurality of gate valves with the same number as the plurality of mixers. The discharging ends of the plurality of gate valves in the same group of control components are connected to the feeding ends of the plurality of mixers one by one.

[0014] The beneficial effect of adopting the above further solution is: to use gate valves to control the amount of materials input into each mixer from the sand storage tank, the gas storage tank, the water storage tank, and the oil storage tank respectively.

[0015] Further, the control component further includes a plurality of flow meters with the same number as the plurality of gate valves. The plurality of flow meters are respectively connected to the discharging ends of the plurality of gate valves in the same group of control components in a one-to-one correspondence, and the discharging ends of the flow meters are connected to the feeding ends of the corresponding mixers.

[0016] The beneficial effect of adopting the above further solution is: to monitor the sands, gases, waters, and oils pumped into different mixers through the flow meters.

[0017] Further, three mixers are provided.

[0018] The beneficial effect of adopting the above further solution is: to form three detection positions, and accurately simulate the situations at different positions downhole through the three detection positions.

[0019] Further, the detection component includes a pressure gauge and a thermometer that are connected in parallel and simultaneously connected to the sleeve.

[0020] The beneficial effects of adopting the above further solution are as follows: the fluid pressure inside is monitored by using a pressure gauge, and the fluid temperature inside is monitored by using a thermometer.

[0021] Furthermore, it further includes a recovery system, and the recovery system is connected to the annulus formed between the casing and the tubing.

[0022] The beneficial effects of adopting the above further solution are as follows: the substances added into the casing can be recovered through the recovery system, which is convenient for reuse.

[0023] Furthermore, the signal processing system includes a DAS modem and a DTS modem that are both signal-connected to the other end of the distributed optical fiber.

[0024] The beneficial effects of adopting the above further solution are as follows: acoustic signals are transmitted and received to / from the distributed optical fiber through the DAS modem, and temperature signals are transmitted and received to / from the distributed optical fiber through the DTS modem.

[0025] Furthermore, pumps are connected to the discharge ends of the sand storage tank, the gas storage tank, the water storage tank, and the oil storage tank, and the discharge ends of each pump are connected to the feed ends of each mixer.

[0026] The beneficial effects of adopting the above further solution are as follows: to pump out the substances in the tank by using this.

[0027] On the other hand, the present invention provides a method for a distributed optical fiber to monitor a fluid response experimental device, including the following steps:

[0028] S1. Determine the experimental requirements of the distributed optical fiber to monitor the fluid response experiment, and quantitatively evaluate the water production, oil production, gas profile, sand production, and wellbore leakage of the oil well by means of an interpretation model;

[0029] S2. Select whether the casing is in a vertical or horizontal state according to the experimental purpose;

[0030] S3. Select the layout method of the distributed optical fiber according to the experimental purpose, and select to arrange one end of the distributed optical fiber inside the tubing of the flow system, or between the tubing and the casing, or outside the casing;

[0031] S4. Signal-connect the other end of the distributed optical fiber to the signal processing system, and connect the production system and the flow system;

[0032] S5. Start the signal processing system, and turn on the detection component to start recording;

[0033] S6. Selectively pump different outputs from the output system into different preset positions of the casing at different output flows according to experimental requirements, and record the monitoring results at different said preset positions. The monitoring results include optical fiber monitoring signals, temperature, pressure data, and the inflow rates of various substances.

[0034] S7. Repeat step S6 to obtain multiple monitoring results. Based on the distributed optical fiber response signals of different substances and different displacement conditions at each said preset position of the casing, use the multiple detection results as a training set to continuously iterate and upgrade the interpretation model.

[0035] The beneficial effects of the present invention are as follows: By using a casing that can be set horizontally or vertically to simulate a horizontal well or a vertical shaft, and at the same time by setting up a sand storage tank, a gas storage tank, a water storage tank, and an oil storage tank, and using a mixer to inject different sands, gases, waters, and oils into the casing to simulate downhole water production, oil and gas profiles, sand production, and wellbore leakage, etc., quantitative measurement under different substances and different displacement conditions can be achieved. Through multiple experiments, it can provide basic experimental data for the iterative upgrade of the distributed optical fiber interpretation model; furthermore, by experimentally comparing the differences in monitoring among three different distributed optical fiber arrangement methods, namely, inside the tubing, between the tubing and the casing, and on the outer wall of the casing, it provides a basis for the selection of optical fiber arrangement methods for different monitoring purposes in the later stage, so as to achieve accurate monitoring of oil well liquid production, gas profile, sand production, and wellbore leakage under different optical fiber arrangement methods, different well conditions in the oil well, and different medium conditions, and conduct quantitative evaluation of the oil well through experimental indicators.

[0036] Further, after performing step S5 and before performing step S6, first test the optical fiber attenuation and check the tightness of the said flow system.

[0037] The beneficial effect of adopting the above further solution is: By first testing the tightness, the accuracy of subsequent testing work is ensured. Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of arranging a distributed optical fiber inside the tubing of the present invention;

[0039] Figure 2 It is a schematic structural diagram of arranging a distributed optical fiber outside the casing of the present invention;

[0040] Figure 3 It is a schematic structural diagram of arranging a distributed optical fiber inside the casing of the present invention;

[0041] Figure 4 It is an experimental flow chart of the present invention.

[0042] In the drawings, the list of components represented by each reference numeral is as follows:

[0043] 1. Distributed optical fiber; 2. Output system; 21. Sand storage tank; 22. Gas storage tank; 23. Water storage tank; 24. Oil storage tank; 25. Gate valve; 26. Flowmeter; 3. Mixer; 4. Flow system; 41. Casing; 42. Tubing; 43. Detection assembly; 431. Pressure gauge; 432. Thermometer; 5. Signal processing system; 51. DAS modem; 52. DTS modem; 6. Recovery system. Detailed implementation mode

[0044] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0045] On the one hand, an embodiment of the present invention provides a distributed optical fiber monitoring fluid response experimental device, which is specifically described as follows.

[0046] Embodiment 1

[0047] As Figures 1 to 4 , a distributed optical fiber monitoring fluid response experimental device for signal transmission through the distributed optical fiber 1, including an output system 2, a mixer 3, a flow system 4 and a signal processing system 5; the output system 2 includes a sand storage tank 21, a gas storage tank 22, a water storage tank 23 and an oil storage tank 24 which are independently arranged, wherein the sand storage tank 21 is used for storing quartz sand or ceramsite, etc., the gas storage tank 22 is used for storing gases such as methane, hydrogen or carbon dioxide, the water storage tank 23 is used for storing water, and the oil storage tank 24 is used for storing crude oil, etc.;

[0048] A plurality of mixers 3 are provided, and the feed end of each mixer 3 is connected to the sand storage tank 21, the gas storage tank 22, the water storage tank 23 and the oil storage tank 24 through pipelines.

[0049] The flow system 4 includes a casing 41 whose side wall is connected to the discharge ends of a plurality of mixers 3, a tubing 42 arranged in the casing 41 and forming an annulus relative to the casing 41, and a plurality of detection assemblies 43 connected to the side wall of the casing 41. The casing 41 is arranged horizontally or vertically and both ends are closed. One end of the distributed optical fiber 1 is located inside the tubing 42, or between the tubing 42 and the casing 41, or outside the casing 41. The number of the plurality of detection assemblies 43 is equal to the number of the plurality of mixers 3 and they are arranged in one-to-one correspondence.

[0050] The signal processing system 5 is signal-connected to the other end of the distributed optical fiber 1.

[0051] The beneficial effects of this embodiment are as follows: By using a casing that can be set horizontally or vertically to simulate a horizontal well or a vertical shaft, and by setting up a sand storage tank 21, a gas storage tank 22, a water storage tank 23, and an oil storage tank 24, and using a mixer 3 to inject different sands, gases, waters, and oils into the casing 41, it is possible to simulate downhole water production, oil and gas profiles, sand production, and wellbore leakage, etc., and quantitative measurements under different substances and different displacement conditions can be achieved. Through multiple experiments, it can provide basic experimental data for the iterative upgrade of the distributed optical fiber interpretation model; furthermore, by experimentally comparing the differences in monitoring among three different distributed optical fiber arrangement methods of the distributed optical fiber 1 inside the tubing 42, or between the tubing 42 and the casing 41, and on the outer wall of the casing 41, it provides a basis for the selection of optical fiber arrangement methods for different monitoring purposes in the later stage, so as to accurately monitor the liquid production, gas profile, sand production, and wellbore leakage of oil wells under different optical fiber arrangement methods, different well conditions in oil wells, and different medium conditions, and conduct quantitative evaluation of oil wells through experimental indicators.

[0052] Both ends of the casing 41 are sealed structures.

[0053] A plurality of holes are formed in the side wall of the casing 41 to form a perforation cluster for communicating with the production system 2.

[0054] Embodiment 2

[0055] As Figure 1 , on the basis of Embodiment 1, the production system 2 further includes four groups of control components. The feeding ends of the four groups of control components are respectively connected to the output ends of the sand storage tank 21, the gas storage tank 22, the water storage tank 23, and the oil storage tank 24. Each group of control components includes a plurality of gate valves 25 whose quantity is equal to that of the mixers 3. The discharging ends of the plurality of gate valves 25 in the same group of control components are connected to the feeding ends of the plurality of mixers 3 one by one.

[0056] The beneficial effect of adopting the preferred solution in the above embodiment is to use the gate valves 25 to control the amount of materials input into each mixer 3 by the sand storage tank 21, the gas storage tank 22, the water storage tank 23, and the oil storage tank 24 respectively.

[0057] Embodiment 3

[0058] As Figure 1 , on the basis of Embodiments 1 and 2, the control components further include a plurality of flow meters 26 whose quantity is equal to that of the gate valves 25. The plurality of flow meters 26 are correspondingly connected to the discharging ends of the plurality of gate valves 25 in the same group of control components, and the discharging ends of the flow meters 26 are connected to the feeding ends of the corresponding mixers 3.

[0059] The beneficial effect of adopting the preferred solution in the above embodiment is to monitor the sands, gases, waters, and oils pumped into different mixers 3 through the flow meters 26.

[0060] Example 4

[0061] As Figure 1 , on the basis of Embodiments 1-3, three mixers 3 are provided.

[0062] The beneficial effect of adopting the preferred solution in the above embodiments is that three detection positions are formed to accurately simulate the conditions at different positions in the wellbore through the three detection positions.

[0063] Correspondingly, three detection components 43 are also provided correspondingly.

[0064] Example 5

[0065] As Figure 1 , on the basis of Embodiments 1-4, the detection component 43 includes a pressure gauge 431 and a thermometer 432 that are connected in parallel and simultaneously communicate with the casing 41.

[0066] The beneficial effect of adopting the preferred solution in the above embodiments is that the pressure gauge 431 is used to monitor the fluid pressure inside, and the thermometer 432 is used to monitor the fluid temperature inside.

[0067] Specifically, the pressure gauge 431 and the thermometer 432 are arranged in parallel.

[0068] Example 6

[0069] As Figure 1 , on the basis of Embodiments 1-5, the distributed optical fiber monitoring fluid response experimental device of the present invention further includes a recovery system 6, and the recovery system 6 communicates with the annulus formed between the casing 41 and the tubing 42.

[0070] The beneficial effect of adopting the preferred solution in the above embodiments is that the substances added to the casing 41 can be recovered through the recovery system 6, which is convenient for reuse.

[0071] Example 7

[0072] As Figure 1 , on the basis of Embodiments 1-6, the signal processing system 5 includes a DAS modem 51 and a DTS modem 52 that are both signal-connected to the other end of the distributed optical fiber 1.

[0073] The beneficial effect of adopting the preferred solution in the above embodiments is that the DAS modem 51 is used to transmit and receive acoustic signals to and from the distributed optical fiber 1, and the DTS modem 52 is used to transmit and receive temperature signals to and from the distributed optical fiber 1.

[0074] Example 8

[0075] On the basis of Embodiments 1-7, pumps (not shown in the figure) are connected to the discharge ends of the sand storage tank 21, the gas storage tank 22, the water storage tank 23, and the oil storage tank 24, and the discharge ends of each pump are connected to the feed end of each mixer 3.

[0076] The beneficial effect of adopting the preferred solution in the above embodiment is to pump out the substances in the tank by using this method.

[0077] On the other hand, the embodiment of the present invention also provides a method for a distributed optical fiber monitoring fluid response experimental device, which will be specifically described below.

[0078] Embodiment 9

[0079] As Figures 1 to 4 , according to Embodiments 1-8, a method for a distributed optical fiber monitoring fluid response experimental device includes the following steps:

[0080] S1. Determine the experimental requirements for the distributed optical fiber monitoring fluid response experiment, and quantitatively evaluate the water production, oil production, gas profile, sand production, and wellbore leakage of the oil well by means of an interpretation model;

[0081] S2. Select whether the casing 41 is in a vertical or horizontal state according to the experimental purpose;

[0082] S3. Select the layout method of the distributed optical fiber 1 according to the experimental purpose, and select one end of the distributed optical fiber 1 to be arranged in the tubing 42 of the flow system 4, or between the tubing 42 and the casing 41, or outside the casing 41;

[0083] S4. Signal-connect the other end of the distributed optical fiber 1 to the signal processing system 5, and connect the production system 2 and the flow system 4. The production system 2 includes a sand storage tank 21, a gas storage tank 22, a water storage tank 23, and an oil storage tank 24;

[0084] S5. Start the signal processing system 5 and turn on the detection component 43 to start recording;

[0085] S6. According to the experimental requirements, select to pump different produced substances from the production system 2 into different preset positions of the casing 41 at different production flow rates, and record the monitoring results at different preset positions. The monitoring results include optical fiber monitoring signals, temperature, pressure data, and the inflow rates of various substances;

[0086] S7. Repeat step S6 to obtain multiple monitoring results. According to the distributed optical fiber response signals at different preset positions of the casing 41 under different substances and different displacement conditions, use the multiple detection results as a training set to continuously iterate and upgrade the interpretation model.

[0087] The beneficial effects of adopting the preferred solutions in the above embodiments are as follows: by using sleeves that can be set horizontally or vertically to simulate horizontal wells or vertical shafts, and by setting up a sand storage tank 21, a gas storage tank 22, a water storage tank 23, and an oil storage tank 24, and using a mixer 3 to inject different sands, gases, waters, and oils into the sleeve 41, scenarios such as downhole water production, oil and gas profiles, sand production, and wellbore leakage can be simulated, enabling quantitative measurement under different substances and different displacement conditions. Through multiple experiments, basic experimental data can be provided for the iterative upgrade of the distributed optical fiber interpretation model; furthermore, by experimentally comparing the differences in monitoring among three different distributed optical fiber arrangement methods, namely, inside the tubing 42, between the tubing 42 and the sleeve 41, and on the outer wall of the sleeve 41, a basis is provided for the selection of optical fiber arrangement methods for different monitoring purposes in the later stage, thereby achieving accurate monitoring of oil well liquid production, gas profiles, sand production, and wellbore leakage under different optical fiber arrangement methods, different well conditions, and different medium conditions, and quantitatively evaluating the oil well through experimental indicators.

[0088] Among them, the preset position refers to the perforation clusters where the production system 2 is connected to the sleeve 41, that is, the position corresponding to the detection by the detection component 43.

[0089] Embodiment 10

[0090] Based on Embodiment 9, after performing step S5 and before step S6, first start the signal processing system 5 to test the optical fiber attenuation and check the tightness of the flow system 4.

[0091] The beneficial effects of adopting the preferred solutions in the above embodiments are as follows: by first testing the tightness, the accuracy of subsequent testing work is ensured. That is, after performing step S5 and on the premise of starting the signal processing system 5, the optical fiber attenuation is tested through the signal of the distributed optical fiber 1 to check the tightness of the flow system 4.

[0092] The following specifically describes this experimental method with an experimental plan.

[0093] Plan 1

[0094] S1. Determine that the experimental requirement is to quantitatively evaluate the liquid production and gas profiles of a horizontal well;

[0095] S2. According to the experimental requirement, choose to place the sleeve 41 parallel to the workbench;

[0096] S3. According to the experimental requirement, choose to arrange the distributed optical fiber 1 inside the coiled tubing 42. The specific arrangement of the experimental device is as Figure 1 shown;

[0097] S4. Depending on the experimental requirements, connect the other end of the distributed optical fiber 1 to the DAS modem 51 and DTS modem 52 of the signal processing system 5, and connect the casing 41 to the sand storage tank 21, gas storage tank 22, water storage tank 23, and oil storage tank 24 of the production system 2;

[0098] S5. Turn on the DAS modem 51 and DTS modem 52, test the attenuation of the distributed optical fiber 1, and check the tightness of the flow system 4;

[0099] S6. After the tightness check is correct, depending on the experimental requirements, select to inject different displacement and different types of liquids into the mixer 3 from the oil storage tank 24 and water storage tank 23 respectively. After mixing, they enter the casing 41 through different perforation clusters respectively. After flowing into the annulus, they are discharged to the recovery system 6, and collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures;

[0100] S7. Depending on the experimental requirements, select to inject different volumes and different types of mixed gases into the mixer 3 from the gas storage tank 22. After mixing, they enter the casing 41 through different perforation clusters respectively. After flowing into the annulus, they are discharged to the recovery system 6, and collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures;

[0101] S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber 1 under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve quantitative evaluation of the liquid production and gas production profiles.

[0102] Plan II

[0103] S1. Determine that the experimental requirement is to achieve quantitative monitoring and evaluation of the lost circulation phenomenon in horizontal wells;

[0104] S2. Depending on the experimental requirements, select to place the casing 41 parallel to the workbench;

[0105] S3. Depending on the experimental requirements, select to arrange the distributed optical fiber 1 in the coiled tubing 42. The specific layout of the experimental device is as Figure 1 shown;

[0106] S4. Depending on the experimental requirements, connect the other end of the distributed optical fiber 1 to the DAS modem 51 and DTS modem 52 of the signal processing system 5, and connect the casing 41 to the sand storage tank 21, gas storage tank 22, water storage tank 23, and oil storage tank 24 of the production system 2;

[0107] S5. Turn on the DAS modem 51 and the DTS modem 52, test the attenuation of the distributed optical fiber 1, and check the tightness of the flow system 4;

[0108] S6. After the tightness check is correct, according to the experimental purpose, select to inject a small amount of liquid from the water storage tank 23 and the oil storage tank 24 into the mixer 3. After mixing, it flows into the casing 41 through the perforation clusters, and collect the response signals, temperature and pressure data, and the inlet flow rate of the DAS modem 51 and the DTS modem 52 under different displacements and pressures;

[0109] S7. According to the experimental requirements, select to inject a small amount of gas from the gas storage tank 22 into the mixer 3. After mixing, it flows into the casing through the perforation clusters, and collect the response signals, temperature and pressure data, and the inlet flow rate of the DAS modem 51 and the DTS modem 52 under different displacements and pressures;

[0110] S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber 1 under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve a quantitative evaluation of the horizontal well leakage simulation experiment.

[0111] Plan Three

[0112] S1. Determine that the experimental requirement is to achieve a quantitative evaluation of the sand production phenomenon in the horizontal well;

[0113] S2. According to the experimental requirements, select to place the casing 41 parallel to the workbench;

[0114] S3. According to the experimental requirements, select to arrange the distributed optical fiber 1 in the coiled tubing 42. The specific layout of the experimental device is as Figure 1 shown;

[0115] S4. According to the experimental requirements, select to signal-connect the other end of the distributed optical fiber 1 to the DAS modem 51 and the DTS modem 52 of the signal processing system 5, and connect the casing 41 to the sand storage tank 21, the gas storage tank 22, the water storage tank 23, and the oil storage tank 24 of the production system 2;

[0116] S5. Turn on the DAS modem 51 and the DTS modem 52, test the attenuation of the distributed optical fiber 1, and check the tightness of the flow system 4;

[0117] S6. After the tightness check is correct, according to the experimental requirements, select to inject different volumes of sand from the sand storage tank 21 into the mixer 3. After mixing, it flows into the casing 41 through the perforation clusters, and collect the response signals, temperature and pressure data, and the inlet flow rate of the DAS modem 51 and the DTS modem 52 under different displacements and pressures;

[0118] S7. Repeat step S6 to obtain multiple monitoring results. Based on the response signals of the distributed optical fiber 1 under different substances and different displacement conditions for each perforation cluster, continuously iterate and upgrade the interpretation model to achieve quantitative evaluation of the sand production simulation experiment in horizontal wells.

[0119] Plan Four

[0120] S1. Determine the experimental requirement as evaluating the influence of different layout methods of the distributed optical fiber 1 on the accuracy of monitoring results.

[0121] S2. Select to place the casing 41 parallel to the workbench according to the experimental requirement.

[0122] S3. Select to arrange the distributed optical fiber 1 outside the casing 41 according to the experimental requirement. The specific layout of the experimental device is as Figure 2 shown.

[0123] S4. Select to signal-connect the other end of the distributed optical fiber 1 to the DAS modem 51 and DTS modem 52 of the signal processing system 5, and connect the casing 41 to the sand storage tank 21, gas storage tank 22, water storage tank 23, and oil storage tank 24 of the production system 2.

[0124] S5. Turn on the DAS modem 51 and DTS modem 52, test the attenuation of the distributed optical fiber 1, and check the tightness of the flow system 4.

[0125] S6. After the tightness check is correct, select to inject different displacements and different types of liquids into the mixer 3 from the oil storage tank 24 and water storage tank 23 respectively according to the experimental requirement. After mixing, they enter the casing 41 through different perforation clusters, flow into the annulus and then are discharged to the recovery system 6. Collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures.

[0126] S7. Select to inject different volumes and different types of mixed gases into the mixer 3 from the gas storage tank 22 according to the experimental requirement. After mixing, they enter the casing 41 through different perforation clusters, flow into the annulus and then are discharged to the recovery system 6. Collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures.

[0127] S8. Repeat steps S6 and S7 to obtain multiple monitoring results. Based on the response signals of the distributed optical fiber 1 under different substances and different displacement conditions for each perforation cluster, continuously iterate and upgrade the interpretation model to achieve quantitative evaluation of the liquid production and gas production profiles.

[0128] S9. Compare and analyze the monitoring results with those in Scheme 1 to achieve a quantitative evaluation of the impact of different distributed optical fiber 1 layout methods on the accuracy of the monitoring results.

[0129] Scheme 5

[0130] S1. Determine the experimental requirement as evaluating the impact of different distributed optical fiber 1 layout methods on the accuracy of the monitoring results.

[0131] S2. Select to place the casing 41 vertically relative to the workbench according to the experimental requirement.

[0132] S3. Select to arrange the distributed optical fiber 1 inside the casing 41 according to the experimental requirement. The specific layout of the experimental device is as Figure 3 shown.

[0133] S4. Select to signal-connect the other end of the distributed optical fiber 1 to the DAS modem 51 and DTS modem 52 of the signal processing system 5 according to the experimental requirement, and connect the casing 41 to the sand storage tank 21, gas storage tank 22, water storage tank 23, and oil storage tank 24 of the production system 2.

[0134] S5. Turn on the DAS modem 51 and DTS modem 52, test the attenuation of the distributed optical fiber 1, and check the tightness of the flow system 4.

[0135] S6. After the tightness check is correct, select to inject different displacements and different types of liquids into the mixer from the oil storage tank 24 and water storage tank 23 respectively according to the experimental requirement. After mixing, they enter the casing 41 through different perforation clusters respectively, flow into the annulus and then are discharged to the recovery system 6. Collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures.

[0136] S7. Select to inject different volumes and different types of mixed gases into the mixer 3 from the gas storage tank 22 according to the experimental requirement. After mixing, they enter the casing 41 through different perforation clusters respectively, flow into the annulus and then are discharged to the recovery system 6. Collect the response signals of the DAS modem 51 and DTS modem 52, temperature and pressure data, and the inflow of each substance under different displacements and pressures.

[0137] S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber 1 under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve a quantitative evaluation of the liquid production and gas production profiles.

[0138] S9. Compare and analyze the monitoring results with those in Scheme 1 and Scheme 4 to achieve a quantitative evaluation of the impact of different distributed optical fiber 1 layout methods on the accuracy of the monitoring results.

[0139] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention.

[0140] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0141] In the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0142] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0143] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0144] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for a distributed optical fiber monitoring fluid response experimental device, characterized in that, the distributed optical fiber monitoring fluid response experimental device is used for signal transmission through a distributed optical fiber (1), and includes: a production system (2), including a sand storage tank (21), a gas storage tank (22), a water storage tank (23), and an oil storage tank (24); a mixer (3), with multiple mixers provided, and the feed end of each mixer (3) is connected to the sand storage tank (21), the gas storage tank (22), the water storage tank (23), and the oil storage tank (24); a flow system (4), including a casing (41) with its side wall connected to the discharge ends of multiple mixers (3), a tubing (42) arranged in the casing (41) and forming an annulus relative to the casing (41), and multiple detection components (43) connected to the side wall of the casing (41). The casing (41) is arranged horizontally or vertically and both ends are closed. One end of the distributed optical fiber (1) is located inside the tubing (42), or between the tubing (42) and the casing (41), or outside the casing (41). The number of multiple detection components (43) is equal to the number of multiple mixers (3) and they are arranged in one-to-one correspondence; and a signal processing system (5), which is signal-connected to the other end of the distributed optical fiber (1); the detection component (43) includes a pressure gauge (431) and a thermometer (432) connected in parallel and simultaneously connected to the casing (41); the signal processing system (5) includes a DAS modem (51) and a DTS modem (52) both signal-connected to the other end of the distributed optical fiber (1); the method for the distributed optical fiber monitoring fluid response experimental device includes the following steps: Scheme One S1. Determine the experimental requirement to achieve quantitative evaluation of the liquid production and gas production profiles of a horizontal well; S2. Select to place the casing (41) parallel to the workbench according to the experimental requirement; S3. Select to arrange the distributed optical fiber (1) inside the coiled tubing (42) according to the experimental requirement; S4. Select to signal-connect the other end of the distributed optical fiber (1) to the DAS modem (51) and the DTS modem (52) of the signal processing system (5), and connect the casing (41) to the sand storage tank (21), the gas storage tank (22), the water storage tank (23), and the oil storage tank (24) of the production system (2); S5. Turn on the DAS modem (51) and the DTS modem (52), test the attenuation of the distributed optical fiber (1), and check the tightness of the flow system (4); S6. After the tightness check is correct, select to inject different displacements and different types of liquids into the mixer (3) from the oil storage tank (24) and the water storage tank (23) respectively according to the experimental requirement. After mixing, they enter the casing (41) through different perforation clusters respectively, and collect the response signals of the DAS modem (51) and the DTS modem (52), temperature and pressure data, and the inflow of each substance under different displacements and pressures; S7. Select to inject mixed gases of different volumes and different types from the gas storage tank (22) into the mixer (3) according to the experimental requirements. After mixing, they enter the casing (41) through different perforation clusters, and collect the response signals, temperature and pressure data of the DAS modem (51) and DTS modem (52), as well as the inflow rates of various substances at different displacements and pressures. S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber (1) under different substances and different displacement conditions of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve quantitative evaluation of the liquid production and gas production profiles. Scheme Two S1. Determine that the experimental requirement is to achieve quantitative monitoring and evaluation of the lost circulation phenomenon in horizontal wells. S2. Select to place the casing (41) parallel to the workbench according to the experimental requirements. S3. Select to arrange the distributed optical fiber (1) inside the coiled tubing (42) according to the experimental requirements. S4. Select to signal-connect the other end of the distributed optical fiber (1) to the DAS modem (51) and DTS modem (52) of the signal processing system (5), and connect the casing (41) to the sand storage tank (21), gas storage tank (22), water storage tank (23) and oil storage tank (24) of the production system (2). S5. Turn on the DAS modem (51) and DTS modem (52), test the attenuation of the distributed optical fiber (1), and check the tightness of the flow system (4). S6. After the tightness check is correct, select to inject a small amount of liquid from the water storage tank (23) and oil storage tank (24) into the mixer (3) according to the experimental purpose. After mixing, it flows into the casing (41) through the perforation cluster, and collect the response signals, temperature and pressure data of the DAS modem (51) and DTS modem (52), as well as the inflow rate. S7. Select to inject a small amount of gas from the gas storage tank (22) into the mixer (3) according to the experimental requirements. After mixing, it flows into the casing through the perforation cluster, and collect the response signals, temperature and pressure data of the DAS modem (51) and DTS modem (52), as well as the inflow rate. S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber (1) under different substances and different displacement conditions of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve quantitative evaluation of the lost circulation simulation experiment in horizontal wells. Scheme Three S1. Determine that the experimental requirement is to achieve quantitative evaluation of the sand production phenomenon in horizontal wells. S2. Select to place the casing (41) parallel to the workbench according to the experimental requirements. S3. Select to arrange the distributed optical fiber (1) inside the coiled tubing (42) according to the experimental requirements. S4. Select to signal-connect the other end of the distributed optical fiber (1) to the DAS modem (51) and DTS modem (52) of the signal processing system (5), and connect the casing (41) to the sand storage tank (21), gas storage tank (22), water storage tank (23) and oil storage tank (24) of the production system (2). S5. Turn on the DAS modem (51) and the DTS modem (52), test the attenuation of the distributed optical fiber (1), and check the tightness of the flow system (4); S6. After the tightness check is correct, select and inject different volumes of sand from the sand storage tank (21) into the mixer (3) according to the experimental requirements. After mixing, it flows into the casing (41) through the perforation clusters, and collect the response signals, temperature and pressure data of the DAS modem (51) and the DTS modem (52), and the inflow rate under different displacements and pressures; S7. Repeat step S6 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber (1) under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve a quantitative evaluation of the sand production simulation experiment in the horizontal well; Plan Four S1. Determine the experimental requirement to evaluate the influence of different arrangement methods of the distributed optical fiber (1) on the accuracy of the monitoring results; S2. Select and place the casing (41) parallel to the workbench according to the experimental requirements; S3. Select and arrange the distributed optical fiber (1) outside the casing (41) according to the experimental requirements; S4. Select and connect the other end of the distributed optical fiber (1) to the DAS modem (51) and the DTS modem (52) of the signal processing system (5), and connect the casing (41) to the sand storage tank (21), gas storage tank (22), water storage tank (23), and oil storage tank (24) of the production system (2); S5. Turn on the DAS modem (51) and the DTS modem (52), test the attenuation of the distributed optical fiber (1), and check the tightness of the flow system (4); S6. After the tightness check is correct, select and inject different displacements and different types of liquids from the oil storage tank (24) and the water storage tank (23) into the mixer (3) according to the experimental requirements. After mixing, they enter the casing (41) through different perforation clusters respectively, and collect the response signals, temperature and pressure data of the DAS modem (51) and the DTS modem (52), and the inflow rate of each substance under different displacements and pressures; S7. Select and inject different volumes and different types of mixed gases from the gas storage tank (22) into the mixer (3) according to the experimental requirements. After mixing, they enter the casing (41) through different perforation clusters, and collect the response signals, temperature and pressure data of the DAS modem (51) and the DTS modem (52), and the inflow rate of each substance under different displacements and pressures; S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber (1) under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve a quantitative evaluation of the liquid production and gas production profiles; S9. Compare and analyze the monitoring results with the results in Plan One to achieve a quantitative evaluation of the influence of different arrangement methods of the distributed optical fiber 1 on the accuracy of the monitoring results; Plan Five S1. Determine the experimental requirement to evaluate the influence of different arrangement methods of the distributed optical fiber (1) on the accuracy of the monitoring results; S2. Select and place the casing (41) perpendicular to the workbench according to the experimental requirements; S3. Select to arrange the distributed optical fiber (1) inside the casing (41) according to the experimental requirements; S4. Select to signal-connect the other end of the distributed optical fiber (1) to the DAS modem (51) and DTS modem (52) of the signal processing system (5) according to the experimental requirements, and connect the casing 41 to the sand storage tank (21), gas storage tank (22), water storage tank (23), and oil storage tank (24) of the production system (2); S5. Turn on the DAS modem (51) and DTS modem (52), test the attenuation of the distributed optical fiber (1), and check the tightness of the flow system (4); S6. After the tightness check is correct, select to inject different displacements and different types of liquids into the mixer from the oil storage tank (24) and water storage tank (23) respectively according to the experimental requirements. After mixing, they enter the casing (41) through different perforation clusters respectively, and collect the response signals, temperature and pressure data of the DAS modem (51) and DTS modem (52), and the inflow of each substance under different displacements and pressures; S7. Select to inject different volumes and different types of mixed gases from the gas storage tank (22) into the mixer (3) according to the experimental requirements. After mixing, they enter the casing (41) through different perforation clusters respectively, and collect the response signals, temperature and pressure data of the DAS modem (51) and DTS modem (52), and the inflow of each substance under different displacements and pressures; S8. Repeat steps S6 and S7 to obtain multiple monitoring results. According to the response signals of the distributed optical fiber (1) under different substances and different displacements of each perforation cluster, continuously iterate and upgrade the interpretation model to achieve a quantitative evaluation of the liquid production and gas production profiles; S9. Compare and analyze the monitoring results with those in Scheme 1 and Scheme 4 to achieve a quantitative evaluation of the influence of different arrangement methods of the distributed optical fiber 1 on the accuracy of the monitoring results.

2. According to the method for an experimental device for monitoring fluid response by a distributed optical fiber described in Claim 1, characterized in that, The production system (2) further includes four groups of control components. The feeding ends of the four groups of control components are respectively connected to the output ends of the sand storage tank (21), gas storage tank (22), water storage tank (23), and oil storage tank (24). Each group of control components includes a plurality of gate valves (25) with a quantity equal to the plurality of mixers (3). The discharging ends of the plurality of gate valves (25) in the same group of control components are connected to the feeding ends of the plurality of mixers (3) one by one.

3. According to the method for an experimental device for monitoring fluid response by a distributed optical fiber described in Claim 2, characterized in that, The control component further includes a plurality of flow meters (26) with a quantity equal to the plurality of gate valves (25). The plurality of flow meters (26) are respectively connected to the discharging ends of the plurality of gate valves (25) in the same group of control components one by one, and the discharging ends of the flow meters (26) are connected to the feeding ends of the corresponding mixers (3).

4. According to the method for an experimental device for monitoring fluid response by a distributed optical fiber described in any one of Claims 1-3, characterized in that, There are three of the plurality of mixers (3).

5. A method for a distributed optical fiber monitoring fluid response experimental device according to any one of claims 1-3, characterized in that, it further includes a recovery system (6), and the recovery system (6) is connected to the annulus formed between the casing (41) and the tubing (42).

6. A method for a distributed optical fiber monitoring fluid response experimental device according to any one of claims 1-3, characterized in that, the discharge ends of the sand storage tank (21), the gas storage tank (22), the water storage tank (23), and the oil storage tank (24) are all connected to pumps, and the discharge ends of each pump are all connected to the feed end of each of the mixers (3).

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