Underground storage type large-range flow self-adaptive measuring tool and measuring method thereof

Abstract

The invention discloses an underground storage type large-range flow self-adaptive measuring tool, which comprises a main pipe section, a flow sensor section, a flow sensor section, a flow sensor section, a flow sensor section, a flow sensor section and a flow sensor section, wherein the main pipe section comprises a first part, a second part and a third part; the second part is detachably clamped on the inner wall of the pipeline, and the outer diameter of the second part is larger than the outer diameter of the first part and the outer diameter of the third part; the strain sensor is detachably arranged at one end of the first part, and the strain sensor is arranged in a countercurrent manner; the sealing pipe section is detachably arranged at one end of the third part; the plurality of circulating holes are uniformly distributed in the circumferential directions of the other end of the first part and the other end of the third part; the two sensor probes are detachably arranged in the first part and the third part respectively, and the two sensor probes are arranged at the ends, away from each other, of the circulating holes. The invention further discloses a measuring method of the underground storage type large-range flow self-adaptive measuring tool, self-adaptive adjustment is conducted on the ultrasonic signal receiving and transmitting period of the two sensor probes according to changes of media in a pipeline, and the flow is accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline measurement, and more particularly to an underground storage-type large-range flow adaptive measurement tool and a measurement method thereof. Background Art

[0002] In oil and gas production and other scenarios, the underground flow ranges from hundreds to thousands of cubic meters per day. There are many limitations in the measurement of flow. For example, the vortex street measurement method is susceptible to vibration interference, and the turbine measurement method is susceptible to mechanical wear, and both cannot be accurately measured. At present, the ultrasonic measurement method is the most promising technology, which is almost unaffected by the medium and working environment. The flow range that can be measured by the time difference method is very large. Based on the principle of the time difference method, a pair of ultrasonic probes should complete a complete transmission and reception, and the flow is calculated by the difference in time obtained by the two probes, and then the next cycle is measured. However, in actual measurement, there is a contradiction between the signal transmission and reception cycle and the sampling cycle. The sampling cycle cannot be shorter than the signal transmission and reception cycle, otherwise, when the complete transmission and reception is not completed, the new excitation signal will interfere and cause confusion in the analysis; the sampling cycle cannot be too long, otherwise the dynamic response to the fluid is insufficient, the fluid fluctuation changes cannot be measured, and the measurement accuracy is reduced. The signal transmission and reception cycle is positively correlated with the flow rate. Therefore, when measuring the flow rate by the ultrasonic time difference method, different flow rates need to match the appropriate sampling cycle.

[0003] In the case of downhole flow measurement with cable, when the flow changes beyond expectations, resulting in abnormal data or reduced accuracy, the tool parameters can usually be adjusted through ground instruments. However, when the oil well does not have cable conditions, downhole tools usually have pre-set parameters and cannot automatically adjust changes. Therefore, the flow cannot be accurately measured in a large flow range.

[0004] In addition, there are usually two types of downhole flow time difference measurement tools. One type uses an eccentrically installed sensor to measure the partial flow of the tubing and then calculate the full pipe flow. The other type uses a centralizer to support the center of the tubing, collects the hollow measurement section to allow part of the fluid to flow through, and also measures the partial flow and then calculates the full pipe flow. The above two methods show a certain degree of applicability when the difference between the measured fluid and the calibration fluid is not large, but once the fluid properties are greatly different from the calibration, serious distortion problems will occur. Summary of the invention

[0005] The purpose of the present invention is to design and develop an underground storage type large-range flow adaptive measurement tool, which adopts a self-contained structure, adapts to the flow pattern of the entire flow channel, has no shunt structure, improves measurement accuracy, and eliminates the problem of shunt flow measurement error.

[0006] The present invention also designs and develops a measurement method for an underground storage-type large-range flow adaptive measurement tool, which adaptively adjusts the ultrasonic signal receiving and transmitting cycles of two sensor probes according to changes in the medium in the pipeline to accurately measure the flow.

[0007] The technical solution provided by the present invention is:

[0008] A downhole storage type large range flow adaptive measurement tool, comprising:

[0009] a main pipe section, which includes a first portion, a second portion, and a third portion that are coaxially arranged;

[0010] Wherein, the second part is detachably engaged with the inner wall of the pipe, and the outer diameter of the second part is larger than the outer diameter of the first part and the outer diameter of the third part;

[0011] A strain sensor is detachably arranged at an end of the first part away from the second part, and the strain sensor is arranged upstream;

[0012] A sealing pipe section, which is detachably arranged at an end of the third part away from the second part;

[0013] a plurality of flow holes uniformly distributed around the other end of the first portion and the other end of the third portion;

[0014] Two sensor probes are detachably arranged in the first part and the third part respectively, and the two sensor probes are arranged at one end of the plurality of flow holes away from each other.

[0015] Preferably, it also includes:

[0016] The connecting pipe section has one end connected to one end of the first part and the other end is provided with a through hole.

[0017] Preferably, the strain sensor comprises:

[0018] An elastic element, one end of which is a conical structure and the other end of which is detachably connected to the through hole;

[0019] The resistance strain gauge is arranged on the other end surface of the elastic element.

[0020] Preferably, the outer sides of the ends of the plurality of flow holes away from the second portion are each provided with a groove conforming to the flow direction of the medium.

[0021] Preferably, the lengths of the strain sensor, the connecting pipe section, the main pipe section and the sealing pipe section satisfy:

[0022] S1≥200mm;

[0023] S2 ≥ 300mm;

[0024] S3≥80mm;

[0025] Wherein, S1 is the total length of the strain sensor and the connecting pipe section, S2 is the total length of the main pipe section, and S3 is the length of the sealing pipe section;

[0026] The full flow passage diameter of the downhole storage-type large-range flow adaptive measurement tool is 25 to 60 mm.

[0027] Preferably, it also includes:

[0028] A central processing unit, which is connected to the resistance strain gauge and the two sensor probes, and is used to receive and calculate data and issue instructions;

[0029] A data storage unit, connected to the central processing unit and used for storing data;

[0030] A power supply module, connected to the central processing unit and used for supplying power to the central processing unit;

[0031] Wherein, the central processing unit, the data storage unit and the power supply module are all arranged on the main pipe section.

[0032] A measurement method of a downhole storage type large range flow adaptive measurement tool, using the downhole storage type large range flow adaptive measurement tool, comprises the following steps:

[0033] Step 1: The downhole storage-type large-range flow adaptive measurement tool is matched and installed with the pipeline, and the strain sensor is set in reverse flow, and the power supply module is started;

[0034] Step 2: The strain sensor transmits the electrical signal to the flow sampling unit to obtain the flow sampling value of the medium in the pipeline;

[0035] Step 3: The flow testing unit receives the flow sampling value from the flow sampling unit, dynamically compensates the flow sampling value, and determines the receiving and transmitting cycle of the ultrasonic signal;

[0036] Step 3: The two sensor probes send ultrasonic signals according to the sending and receiving cycle to obtain the medium flow data in the pipeline in different time periods.

[0037] Preferably, the step three also includes transmitting the data collected by the flow testing unit to the data storage unit, and the data storage unit can be connected to a corresponding adapter to complete data reading.

[0038] Preferably, the medium flow data in the pipeline satisfies:

[0039] Q = kSv;

[0040] Among them, Q represents the flow rate in the measured pipeline, k represents the flow correction coefficient, S represents the cross-sectional area of ​​the measured pipeline, and v represents the flow rate of the fluid in the measured pipeline.

[0041] Preferably, the flow rate of the measured pipeline fluid satisfies:

[0042] v=(c 2 Δt) / (2L);

[0043] Wherein, v represents the flow velocity of the measured pipeline fluid, c represents the signal speed of the ultrasonic wave, Δt represents the time difference between the first sensor probe and the second sensor probe, and L represents the distance between the first sensor probe and the second sensor probe.

[0044] The beneficial effects of the present invention are:

[0045] (1) The present invention designs and develops a downhole storage-type large-range flow adaptive measurement tool, which adopts a self-contained structure and a full-channel flow pattern, can adapt to any fluid changes, eliminate the error problem of flow measurement, and improve the measurement accuracy; the whole is a data storage tool, powered by an independent power supply module, and solves the flow measurement problem under cable-free conditions;

[0046] (2) The measurement method of the underground storage-type large-range flow adaptive measurement tool designed and developed by the present invention adopts a flow dynamic sampling method to achieve accurate measurement of a large range of flow in a cable-free underground working condition, and the ultrasonic signal receiving and transmitting cycles of the two sensor probes can be adaptively adjusted to accurately measure the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the main structure of the downhole storage-type large-range flow adaptive measurement tool of the present invention.

[0048] Figure 2 It is a schematic diagram of the axonometric structure of the downhole storage-type large-range flow adaptive measurement tool of the present invention.

[0049] Figure 3 It is a schematic diagram of the cross-sectional structure of the downhole storage-type large-range flow adaptive measurement tool of the present invention.

[0050] Figure 4 It is a structural schematic diagram of the main pipe section of the present invention.

[0051] Figure 5 It is a schematic diagram of the cross-sectional structure of the main pipe section of the present invention.

[0052] Figure 6 It is a schematic diagram of the structure of the strain sensor described in the present invention.

[0053] Figure 7It is a schematic structural diagram of the first sensor probe of the present invention.

[0054] Figure 8 This is a schematic diagram of the installation structure of the downhole storage-type large-range flow adaptive measurement tool of the present invention. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below so that those skilled in the art can implement it according to the description.

[0056] like Figure 1-Figure 8 As shown, the present invention provides a downhole storage type large range flow adaptive measurement tool comprising:

[0057] A main pipe section 110, a connecting pipe section 120, a strain sensor 130 and a sealing pipe section 140;

[0058] The main pipe section 110 is a hollow structure as a whole, and includes a first part 111, a second part 112 and a third part 113 which are coaxially arranged. The second part 112 is detachably engaged with the inner wall of the pipe 200, and the outer diameter of the second part 112 is greater than the outer diameter of the first part 111 and the outer diameter of the third part 113.

[0059] In this embodiment, the main pipe section 110 can be designed with a thread or a bayonet fixture connected to the sleeve pipe joint on the outer surface of the second part 112, and finally the whole is installed in the pipeline 200. When the assembly function is realized by the thread, the second part 112 is connected to the sleeve pipe joint, the sleeve pipe joint is connected to the flange, and then the measuring tool, the sleeve pipe joint and the flange are installed as a whole in the measured pipeline 200; when the assembly function is realized by the bayonet, a bayonet fixture is set in the pipeline 200, and a corresponding bayonet is designed on the outer side of the second part 112 to realize the measurement of the entire flow channel.

[0060] One end of the connecting pipe section 120 is connected to the end of the first part 111 away from the second part 112, and the other end is provided with a through hole. One end of the strain sensor 130 is detachably arranged in the through hole, and the strain sensor 130 is installed in countercurrent; the sealing pipe section 140 is detachably arranged at the end of the third part 113 away from the second part 112 to seal the measuring tool.

[0061] In this embodiment, the connecting pipe section 120 is connected to the external thread of one end of the first part 111 through an internal thread, and the sealing pipe section 140 is connected to the external thread of one end of the third part 113 through an internal thread.

[0062] The strain sensor 130 includes an elastic element 131 and a resistance strain gauge (not shown in the figure), one end of the elastic element 131 is a conical structure, and the other end is a cylindrical structure, and the other end of the elastic element 131 is detachably connected to the through hole; the resistance strain gauge is arranged on the other end face of the elastic element 131.

[0063] In this embodiment, the elastic element 131 is made of elastic material as a whole. Therefore, when it is installed, a gap should be set between one end of the elastic element 131 and the other end of the first part to ensure that the surface of the elastic element 131 can be strained by the medium in the pipeline. The resistance strain gauge is pasted on the other end face of the elastic element 131, and its resistance value can change accordingly with the strain of the elastic element 131. The other end of the elastic element 131 is 2-5mm away from the end face of the first part 111, providing it with sufficient strain space.

[0064] In this embodiment, the bottom diameter of the conical structure of the elastic element 131 is 20-50 mm, the diameter of the cylindrical structure is 15-30 mm, the overall length is 80-100 mm, and the resistance value of the resistance strain gauge is 60-600 ohms.

[0065] A plurality of flow holes 114 are evenly distributed circumferentially at the other end of the first part 111 and the third part 113 close to the second part 112, and an annular limiting step is provided on the inner side of the first part 111 and the third part 113 and at one end where the flow holes 114 are away from each other. The heads of the two sensor probes (the first sensor probe 151 and the second sensor probe 152) are respectively engaged in the annular limiting steps and are connected by threads to form a double limit. It is also necessary to ensure that the two sensor probes do not affect the flow holes 114. The two sensor probes are placed opposite to each other, that is, the first sensor probe 151 is installed downstream and the second sensor probe 152 is installed upstream.

[0066] In this embodiment, in order to ensure better fluidity, a groove conforming to the flow direction of the medium is provided at one end of the outer side of the flow hole 114 away from the second part 112, and a groove conforming to the flow direction of the medium is also provided at the other end of the inner side of the flow hole 114 close to the second part 112, that is, the cross-section of the flow hole 114 is similar to a parallelogram.

[0067] In this embodiment, the number of the flow holes 114 on the first portion 111 and the number of the flow holes 114 on the third portion 113 are both three.

[0068] The total length of the strain sensor and the connecting pipe section is not less than 200 mm, the total length of the main pipe section is not less than 300 mm, the length of the sealing pipe section is not less than 80 mm, and the full flow channel flow diameter of the downhole storage-type large-range flow adaptive measurement tool is 25-60 mm, which can adapt to downhole flow measurement of pipelines with different diameters.

[0069] In this embodiment, all threaded connection locations are sealed by O-rings.

[0070] The downhole storage-type large-range flow adaptive measurement tool described in the present invention also includes a central processing unit 160, a data storage unit 170 and a power supply module 180. The central processing unit 160 includes a flow sampling unit and a flow testing unit. The flow sampling unit is connected to the resistance strain gauge and is used to receive the electrical signal fluctuation value transmitted by the resistance strain gauge; the flow testing unit receives the data of the flow sampling unit and sends the corresponding data to the two sensor probes after calculation, thereby realizing the ultrasonic signal reception and transmission of the two sensor probes; the data storage unit 170 is connected to the central processing unit 160 for data storage; the power supply module 180 is connected to the central processing unit 160 for providing the central processing unit 160 with a working power supply under cable-free conditions.

[0071] The present invention designs and develops an underground storage-type large-range flow adaptive measurement tool, which is a data storage tool as a whole and is powered by an independent power supply module to solve the flow measurement problem under cable-free conditions; the overall structure is a self-contained structure, which is adaptable to the flow type of the entire flow channel and has no shunt structure, thereby improving the measurement accuracy, and all structures can adapt to any fluid changes, eliminating the problem of shunt flow measurement errors.

[0072] The present invention also provides a measurement method of a downhole storage-type large-range flow adaptive measurement tool, comprising the following steps:

[0073] Step 1: Match and install the downhole storage-type large-range flow adaptive measurement tool with the pipeline, ensure that the strain sensor 130 is set in reverse flow, and start the power supply module 180;

[0074] Step 2: The strain sensor 130 generates strain under the influence of the medium flow in the pipeline, and the resistance strain gauge generates a corresponding resistance fluctuation value along with the strain and transmits the electrical signal to the flow sampling part. The resistance fluctuation value corresponding to the flow value is determined by a preliminary experiment, and then in the specific implementation, the corresponding flow sampling value of the medium in the pipeline is calculated according to the flow fitting function curve determined in the preliminary experiment;

[0075] The fitting function curve data is obtained from actual measurements of pipe diameters of DN25-DN80mm and flow rates of 0-4000m3 / d, and the numerical values ​​of the flow function in a large range are obtained by linear analysis of the function.

[0076] Step 3: The flow testing unit receives the flow sampling value from the flow sampling unit, dynamically compensates the flow sampling value, and determines the receiving and transmitting cycle of the ultrasonic signal;

[0077] Among them, the flow sampling value is an interval number. The fluid is affected by actual factors when flowing, and the force on the conical strain sensor 130 is uneven. The voltage electrical signal output by the strain sensor 130 is also an interval value. According to the flow fitting function curve of the pre-experiment, the output flow is still an interval value. In order to ensure the accuracy of data collection of the first sensor probe 151 and the second sensor probe 152, the sampled flow interval value is appropriately amplified, and the ultrasonic signal receiving and transmitting period is determined according to the amplified interval value. The above data processing can make the first sensor probe 151 and the second sensor probe 152 sample the actual flow more accurately, and at the same time, the flow range that can be measured is wider.

[0078] Step 4. The first sensor probe 151 and the second sensor probe 152 receive the transmit and receive cycle instruction. The first sensor probe 151 generates an ultrasonic signal and transmits it to the second sensor probe 152. At the same time, the second sensor probe 152 generates an ultrasonic signal and transmits it to the first sensor probe 151. This is a sampling cycle. By repeating this process, the flow test unit continuously collects flow data of different time periods. At the same time, the data collected by the flow test unit is transmitted to the data storage unit 170. The data storage unit 170 can be connected to a corresponding adapter to complete data reading.

[0079] In this embodiment, the first sensor probe 151 and the second sensor probe 152 have a diameter of 15-30 mm and a length of 10 mm.

[0080] In this embodiment, the resistance value of the resistance strain gauge changes with the extrusion strain of the elastic element, and the output electrical signal changes with the resistance change. The corresponding sampling flow value is calculated by analyzing the size of the output electrical signal, and the flow corresponding function curve can be fitted. The flow sampling unit and the flow testing unit can adaptively adjust the ultrasonic signal receiving and transmitting cycles of the two sensor probes to accurately measure the flow.

[0081] Wherein, the calculation formula for calculating the pipeline flow rate is:

[0082] v=(c 2 Δt) / (2L);

[0083] Wherein, v represents the flow velocity of the measured pipeline fluid, c represents the signal speed of the ultrasonic wave, Δt represents the time difference between the first sensor probe and the second sensor probe, and L represents the distance between the first sensor probe and the second sensor probe;

[0084] The calculation formula for calculating the pipeline flow is:

[0085] Q = kSv;

[0086] Among them, Q represents the flow rate in the measured pipeline, k represents the flow correction coefficient, that is, according to the actual requirements, the corresponding model tool is made, and the correction coefficient is obtained through the flow calibration test in the laboratory. The correction coefficient is determined by the different sizes of pipelines and actual experimental conditions. S represents the cross-sectional area of ​​the measured pipeline, and v represents the flow rate of the fluid in the measured pipeline.

[0087] Furthermore, the time t required for the ultrasonic signal emitted by the first sensor probe to reach the second sensor probe is A1 The calculation formula is as follows:

[0088] t A1 =L / (c+v);

[0089] Furthermore, the time t required for the ultrasonic signal emitted by the second sensor probe to reach the first sensor probe is A2 The calculation formula is as follows:

[0090] t A2 = L / (cv);

[0091] Furthermore, the required propagation time t A1 With t A2 The calculation formula of the difference Δt is as follows:

[0092] Δt=t A2 -t A1 =(2Lv) / (c 2 -v 2 );

[0093] The present invention designs and develops a measurement method for a downhole storage-type large-range flow adaptive measurement tool. The resistance value of the resistance strain gauge changes with the extrusion strain of the elastic element, and the output electrical signal changes with the resistance change. The size of the corresponding sampled flow value is calculated by analyzing the size of the output electrical signal, and the flow corresponding function curve can be fitted to achieve large-range flow sampling measurement. The flow sampling part and the flow testing part can perform adaptive adjustment of the ultrasonic signal receiving and transmitting cycles of two sensor probes to accurately measure the flow.

[0094] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A downhole storage type large range flow adaptive measurement tool, characterized in that: include: a main pipe section, which includes a first portion, a second portion, and a third portion that are coaxially arranged; Wherein, the second part is detachably engaged with the inner wall of the pipe, and the outer diameter of the second part is larger than the outer diameter of the first part and the outer diameter of the third part; A strain sensor is detachably arranged at an end of the first part away from the second part, and the strain sensor is arranged upstream; A sealing pipe section, which is detachably arranged at an end of the third part away from the second part; a plurality of flow holes uniformly distributed around the other end of the first portion and the other end of the third portion; Two sensor probes are detachably arranged in the first part and the third part respectively, and the two sensor probes are arranged at one end of the plurality of flow holes away from each other.

2. The downhole storage-type large-range flow adaptive measurement tool according to claim 1, characterized in that: Also includes: The connecting pipe section has one end connected to one end of the first part and the other end is provided with a through hole.

3. The downhole storage-type large-range flow adaptive measurement tool according to claim 2, characterized in that: The strain sensor comprises: An elastic element, one end of which is a conical structure and the other end of which is detachably connected to the through hole; The resistance strain gauge is arranged on the other end surface of the elastic element.

4. The downhole storage-type large-range flow adaptive measurement tool according to claim 3, characterized in that: The outer sides of the ends of the plurality of flow holes away from the second part are all provided with grooves conforming to the flow direction of the medium.

5. The downhole storage-type large-range flow adaptive measurement tool according to claim 4, characterized in that: The lengths of the strain sensor, the connecting pipe section, the main pipe section and the sealing pipe section satisfy: S1≥200mm; S2 ≥ 300mm; S3≥80mm; Wherein, S1 is the total length of the strain sensor and the connecting pipe section, S2 is the total length of the main pipe section, and S3 is the length of the sealing pipe section; The full flow passage diameter of the downhole storage-type large-range flow adaptive measurement tool is 25 to 60 mm.

6. The downhole storage-type large-range flow adaptive measurement tool according to claim 5, characterized in that: Also includes: A central processing unit, which is connected to the resistance strain gauge and the two sensor probes, and is used to receive and calculate data and issue instructions; A data storage unit, connected to the central processing unit and used for storing data; A power supply module, connected to the central processing unit and used for supplying power to the central processing unit; Wherein, the central processing unit, the data storage unit and the power supply module are all arranged on the main pipe section.

7. A measurement method of a downhole storage type wide range flow adaptive measurement tool, using the downhole storage type wide range flow adaptive measurement tool as claimed in any one of claims 1 to 6, characterized in that: The steps include: Step 1: The downhole storage-type large-range flow adaptive measurement tool is matched and installed with the pipeline, and the strain sensor is set in reverse flow, and the power supply module is started; Step 2: The strain sensor transmits the electrical signal to the flow sampling unit to obtain the flow sampling value of the medium in the pipeline; Step 3: The flow testing unit receives the flow sampling value from the flow sampling unit, dynamically compensates the flow sampling value, and determines the receiving and transmitting cycle of the ultrasonic signal; Step 3: The two sensor probes send ultrasonic signals according to the sending and receiving cycle to obtain the medium flow data in the pipeline in different time periods.

8. The measuring method of the downhole storage type large range flow adaptive measuring tool according to claim 7, characterized in that: The step three also includes transmitting the data collected by the flow test unit to the data storage unit, and the data storage unit can be connected to a corresponding adapter to complete data reading.

9. The measuring method of the downhole storage type large range flow adaptive measuring tool as claimed in claim 8, characterized in that: The medium flow data in the pipeline meets the following requirements: Q = kSv; Among them, Q represents the flow rate in the measured pipeline, k represents the flow correction coefficient, S represents the cross-sectional area of ​​the measured pipeline, and v represents the flow rate of the fluid in the measured pipeline.

10. The measuring method of the downhole storage type large range flow adaptive measuring tool according to claim 9, characterized in that: The flow rate of the measured pipeline fluid satisfies: v=(c 2 Δt) / (2L); Wherein, v represents the flow velocity of the measured pipeline fluid, c represents the signal speed of the ultrasonic wave, Δt represents the time difference between the first sensor probe and the second sensor probe, and L represents the distance between the first sensor probe and the second sensor probe.

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