Underground storage type large-range flow self-adaptive measuring tool

Abstract

The utility model discloses an underground storage type large-range flow self-adaptive measuring tool, which comprises a main pipe section, a first pipe section, a second pipe section and a third pipe section, 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 flow meter has the advantage of being capable of accurately measuring flow.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline measurement, and more specifically, to an underground storage-type large-range flow adaptive measurement tool. Background Art

[0002] In oil and gas production, downhole flow rates range from hundreds to thousands of cubic meters per day. Flow measurement is subject to numerous limitations, such as vortex measurement methods susceptible to vibration interference and turbine measurement methods susceptible to mechanical wear, both of which hinder accurate measurement. Currently, ultrasonic measurement is the most promising technology, virtually unaffected by the medium and operating environment. The time-of-day method (TDD) can measure a wide range of flows. Based on the TDD principle, a pair of ultrasonic probes should complete a complete transmission and reception cycle. The flow rate is calculated by the time difference between the two probes before the next measurement cycle is performed. However, in actual measurements, there is a conflict between the signal transmission and reception cycle and the sampling period. The sampling period cannot be shorter than the signal transmission and reception cycle; otherwise, new excitation signals will interfere and cause analysis errors before a complete transmission and reception cycle is completed. The sampling period cannot be too long, otherwise the dynamic response to the fluid will be insufficient, making it impossible to measure fluid fluctuations and reducing measurement accuracy. The signal transmission and reception cycle is positively correlated with the flow rate. Therefore, when using the TDD method to measure flow, an appropriate sampling period is required for different flow rates.

[0003] When measuring flow rates with a cable downhole flowmeter, if flow rate fluctuations exceed expectations, resulting in abnormal data or reduced accuracy, tool parameters can usually be adjusted using surface instruments. However, when oil wells lack cable access, downhole tools typically have pre-set parameters and cannot automatically adjust to changes, resulting in inaccurate flow measurements over a wide flow range.

[0004] There are two common types of downhole flow measurement tools: one uses an eccentrically mounted sensor to measure the partial flow rate in the tubing and then infer the full-line flow rate; the other uses a centralizer to support the tool at the center of the tubing, with a hollow measuring section to allow some fluid to flow through. This also measures the partial flow rate and then infers the full-line flow rate. Both of these methods are suitable when the measured fluid is not significantly different from the calibration fluid. However, if the fluid properties differ significantly from those used in the calibration, significant distortion will occur. Utility Model Content

[0005] The utility model designs and develops an underground storage-type large-range flow adaptive measurement tool, which adopts a complete structure, adapts to the flow pattern of the entire flow channel, has no diversion structure, improves measurement accuracy, and eliminates the problem of diversion flow measurement error.

[0006] The technical solution provided by this utility model is:

[0007] A downhole storage-type large-range flow adaptive measurement tool, comprising:

[0008] a main pipe section comprising a first portion, a second portion, and a third portion coaxially arranged;

[0009] 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;

[0010] a strain sensor, which is detachably disposed at an end of the first portion away from the second portion, and the strain sensor is disposed upstream;

[0011] a sealing pipe section, which is detachably arranged at an end of the third part away from the second part;

[0012] a plurality of flow holes uniformly distributed in the circumferential direction at the other end of the first portion and the other end of the third portion;

[0013] 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.

[0014] Preferably, it also includes:

[0015] 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.

[0016] Preferably, the strain sensor comprises:

[0017] an elastic element, one end of which is a conical structure and the other end of which is detachably connected to the through hole;

[0018] The resistance strain gauge is arranged on the other end surface of the elastic element.

[0019] 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.

[0020] Preferably, the lengths of the strain sensor, the connecting pipe section, the main pipe section and the sealing pipe section satisfy:

[0021] S1≥200mm;

[0022] S2≥300mm;

[0023] S3≥80mm;

[0024] 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.

[0025] Preferably, the full flow passage diameter of the downhole storage-type large-range flow adaptive measurement tool is 25 to 60 mm.

[0026] Preferably, it also includes:

[0027] a central processing unit connected to the resistance strain gauge and the two sensor probes, for receiving and calculating data and issuing instructions;

[0028] Wherein, the central processing unit is arranged on the main control section.

[0029] Preferably, it also includes:

[0030] A data storage unit connected to the central processing unit and used for storing data;

[0031] Wherein, the data storage part is arranged on the main pipe section.

[0032] Preferably, it also includes:

[0033] a power supply module, connected to the central processing unit and used for supplying power to the central processing unit;

[0034] Wherein, the power supply module is arranged on the main pipe section.

[0035] The beneficial effects of the present invention are as follows:

[0036] The utility model provides an underground storage-type large-range flow adaptive measurement tool, which adopts a self-contained structure and a full-flow channel flow pattern, can adapt to any fluid changes, eliminate the error problem of sub-flow measurement, and improve measurement accuracy; the whole is a data storage tool, powered by an independent power supply module, and solves the problem of flow measurement under cable-free conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the main structure of the downhole storage-type large-range flow adaptive measurement tool described in the utility model.

[0038] Figure 2 This is a schematic diagram of the axonometric structure of the downhole storage-type large-range flow adaptive measurement tool described in the utility model.

[0039] Figure 3 This is a schematic cross-sectional view of the downhole storage-type large-range flow adaptive measurement tool of the utility model.

[0040] Figure 4 It is a structural schematic diagram of the main pipe section of the utility model.

[0041] Figure 5 It is a schematic diagram of the cross-sectional structure of the main pipe section of the utility model.

[0042] Figure 6 This is a schematic structural diagram of the strain sensor described in the present invention.

[0043] Figure 7 This is a schematic structural diagram of the first sensor probe of the present invention.

[0044] Figure 8 This is a schematic diagram of the installation structure of the downhole storage-type large-range flow adaptive measurement tool described in the utility model. DETAILED DESCRIPTION

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0046] like Figures 1-8 As shown, the utility model provides a downhole storage type large range flow adaptive measurement tool comprising:

[0047] Main pipe section 110, connecting pipe section 120, strain sensor 130 and sealing pipe section 140;

[0048] Among them, 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 arranged coaxially. 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 larger than the outer diameter of the first part 111 and the outer diameter of the third part 113.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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. 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.

[0053] 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 influence of 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 2-5 mm away from the end face of the first part 111, providing it with sufficient strain space.

[0054] In this embodiment, the conical structure of the elastic element 131 has a bottom diameter of 20-50 mm, a cylindrical structure diameter of 15-30 mm, an overall length of 80-100 mm, and a resistance value of the resistance strain gauge of 60-600 ohms.

[0055] 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 the end away from the flow holes 114. 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 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.

[0056] In this embodiment, in order to ensure better fluidity, a groove that conforms to the flow direction of the medium is provided on the outer side of the circulation hole 114 at one end away from the second part 112, and a groove that conforms to the flow direction of the medium is also provided on the inner side of the circulation hole 114 at the other end close to the second part 112, that is, the cross-section of the circulation hole 114 is similar to a parallelogram.

[0057] 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.

[0058] 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 sealed 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.

[0059] In this embodiment, all threaded connections are sealed by O-rings.

[0060] 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 working power under cable-free conditions.

[0061] The working process of the downhole storage type large range flow adaptive measurement tool described in the utility model is:

[0062] 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;

[0063] Step 2: The strain sensor 130 generates strain due to the influence of the medium flow in the pipeline. The resistance strain gauge generates a corresponding resistance fluctuation value as the strain is applied and transmits the electrical signal to the flow sampling unit. The resistance fluctuation value corresponding to the flow value is determined through preliminary experiments. Then, in specific implementation, the corresponding flow sampling value of the medium in the pipeline is calculated based on the flow fitting function curve determined in the preliminary experiments.

[0064] The fitting function curve data is obtained from actual measurements of pipe diameters DN25-DN80mm and flow rates of 0-4000m3 / d, and the flow function values ​​in a large range are obtained through linear analysis of the function.

[0065] 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 transceiver cycle of the ultrasonic signal;

[0066] 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.

[0067] Step 4. The first sensor probe 151 and the second sensor probe 152 receive the transmit-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. This process is repeated. 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 the corresponding adapter to complete data reading.

[0068] 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.

[0069] 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. By analyzing the size of the output electrical signal to calculate the size of the corresponding sampling flow value, the flow corresponding function curve can be fitted. The flow sampling part and the flow testing part can adaptively adjust the ultrasonic signal receiving and transmitting period of the two sensor probes to accurately measure the flow.

[0070] The calculation formula for calculating the pipeline flow rate is:

[0071] v=(c 2 Δt) / (2L);

[0072] Wherein, v represents the flow velocity of the fluid in the measured pipeline, 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;

[0073] The calculation formula for calculating pipeline flow is:

[0074] Q = kSv;

[0075] Among them, Q represents the flow rate in the measured pipeline, k represents the flow correction coefficient, that is, according to actual requirements, a corresponding model tool is made, and the correction coefficient is obtained through flow calibration tests in the laboratory. The correction coefficient is determined by different pipeline sizes 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.

[0076] 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:

[0077] t A1 =L / (c+v);

[0078] 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:

[0079] t A2 =L / (cv);

[0080] Furthermore, the required propagation time t A1 With t A2 The calculation formula of the difference Δt is as follows:

[0081] Δt=t A2 -t A1 =(2Lv) / (c 2 -v 2 ).

[0082] The utility model designs and develops a downhole 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 adapts to the flow pattern of the entire flow channel and has no diversion structure, thereby improving measurement accuracy, and all structures can adapt to any fluid changes, eliminating the problem of diversion flow measurement error.

[0083] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, 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 illustrations shown and described herein.

Claims

1. A downhole storage-type large-range flow adaptive measurement tool, characterized in that: include: a main pipe section comprising a first portion, a second portion, and a third portion coaxially arranged; 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, which is detachably disposed at an end of the first portion away from the second portion, and the strain sensor is disposed 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 in the circumferential direction at 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 portion are each provided with a groove 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, connecting pipe section, main pipe section and sealing pipe section meet the following requirements: 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.

6. The downhole storage-type large-range flow adaptive measurement tool according to claim 5, characterized in that: The full flow passage diameter of the downhole storage-type large-range flow adaptive measurement tool is 25 to 60 mm.

7. The downhole storage-type large-range flow adaptive measurement tool according to claim 6, characterized in that: Also includes: a central processing unit connected to the resistance strain gauge and the two sensor probes, for receiving and calculating data and issuing instructions; Wherein, the central processing unit is arranged on the main control section.

8. The downhole storage-type large-range flow adaptive measurement tool according to claim 7, characterized in that: Also includes: A data storage unit connected to the central processing unit and used for storing data; Wherein, the data storage part is arranged on the main pipe section.

9. The downhole storage-type large-range flow adaptive measurement tool according to claim 8, characterized in that: Also includes: a power supply module, connected to the central processing unit and used for supplying power to the central processing unit; Wherein, the power supply module is arranged on the main pipe section.

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