Calibration system and method for water injection flow meter of intelligent separate injection well

Abstract

The invention discloses an intelligent separate injection well water injection flowmeter calibration system and method. The system comprises a console, a water injection flowmeter and a calibration device; the calibration device comprises a water inlet connector, the water inlet connector is respectively connected with a flow passing channel B and a flow passing channel D through a three-way connector B, and a one-way valve is mounted on the water inlet connector; one end, far away from the three-way joint B, of the overflowing channel B is communicated with an overflowing channel A, and an electric control valve A and a standard meter flowmeter A are arranged on the overflowing channel B; one end, far away from the three-way joint B, of the overflowing channel D is communicated with an overflowing channel C, and an electric control valve B and a standard meter flowmeter B are arranged on the overflowing channel D; and the other end of the overflowing channel A and the other end of the overflowing channel C are both communicated with the three-way connector A. On-line monitoring of the water injection flowmeter can be achieved, whether errors exist or not is judged, and therefore the problem that inspection and calibration procedures are tedious is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water injection metering in the field of oil exploitation, and in particular to an intelligent water injection flow meter calibration system and method for injection wells. Background Art

[0002] In the process of oil extraction, smart injection wells are usually used for extraction. In order to maintain formation pressure and improve crude oil recovery, it is necessary to implement quantitative water injection operations on smart injection wells according to the underground oil reserves. As the core equipment for monitoring water flow, the measurement accuracy of the water injection flowmeter directly affects the control accuracy of the water injection volume and the extraction efficiency. However, due to the influence of factors such as fluid pressure fluctuations, temperature changes, water scaling and impurity erosion during the water injection process, the flowmeter is prone to measurement errors such as zero drift and range offset, resulting in distortion of collected data, which in turn causes water injection volume deviation and production losses.

[0003] The traditional method of calibrating water injection flowmeters mainly relies on offline inspection, that is, by disassembling the flowmeter on the water injection pipeline and transferring it to professional calibration equipment for flow calibration. This method has significant defects: first, the disassembly and installation process requires the interruption of water injection operations, which causes the underground mining process to stagnate and seriously affects production efficiency; second, the disassembly operation of high-pressure pipelines has safety hazards such as puncture leakage and mechanical damage; third, the offline calibration cycle is long and the operation is cumbersome, which makes it difficult to meet the real-time requirements of the production site. In addition, the installation status of the flowmeter on the calibration equipment is different from the actual working conditions, which may cause the calibration results to deviate from the actual usage scenario. Summary of the invention

[0004] The object of the present invention is to provide an intelligent injection well water injection flow meter calibration system and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, in a first aspect, the present invention provides the following technical solutions: an intelligent water injection flow meter calibration system for sub-injection wells, comprising a control console, a water injection flow meter and a calibration device; The calibration device comprises a water inlet joint, which is respectively connected to the flow channel B and the flow channel D through a three-way joint B, and a one-way valve is installed on the water inlet joint; One end of the flow passage B away from the three-way joint B is connected to the flow passage A, and the flow passage B is provided with an electric regulating valve A and a standard flow meter A; One end of the flow passage D away from the three-way joint B is connected to the flow passage C, and the flow passage D is provided with an electric regulating valve B and a standard flow meter B; The other end of the flow passage A and the other end of the flow passage C are both connected to a three-way joint A, the other end of the three-way joint A is connected to a three-way pressure relief valve, and one end of the three-way pressure relief valve is connected to a water outlet joint; The water injection flow meter is connected to a water injection pipeline, and the water inlet joint is connected to the water injection pipeline through the water inlet pipeline; The control console is connected to the water injection flow meter, the electric regulating valve A, the standard meter flow meter A, the electric regulating valve B, and the standard meter flow meter B.

[0006] Preferably, the standard meter flowmeter A and the electric regulating valve A are sequentially arranged on the flow channel B. After the electric regulating valve A is closed, the standard meter flowmeter A can detect the water flow in the flow channel B.

[0007] Preferably, the standard meter flow meter B and the electric regulating valve B are sequentially arranged on the flow channel D. After the electric regulating valve B is closed, the standard meter flow meter B can detect the water flow in the flow channel D.

[0008] Preferably, a valve is provided on the water inlet pipeline, which can isolate the calibration device during water injection.

[0009] Preferably, the valve is connected to the console to enable remote control of the valve.

[0010] Preferably, the calibration device is provided with a touch screen, a partition and a handle to facilitate operation by workers.

[0011] In a second aspect, the present invention provides the following technical solution: a water injection flow meter calibration method, comprising the following steps: Water injection measurement: water is injected into the water distribution room, and water flows into the water injection pipeline. The water injection flow meter measures and sends the measured data to the control console; Matching channel: water flows into the calibration device through the water inlet pipeline, and the water flow rate is measured by the standard flow meter B, and the measured data is sent to the console. The console matches the flow channel B and the flow channel D according to the flow range set in advance, and selects the flow channel B or the flow channel D to measure the water flow rate; Flow measurement: after the matching channels are completed, the water flow is measured by the standard meter flowmeter A or the standard meter flowmeter B, and the data is transmitted to the console, and the water flow measured by the water injection flowmeter is compared with the water flow detected by the standard meter flowmeter A or the standard meter flowmeter B to obtain the error value of the water injection flowmeter; Setting flow steps: the control console adjusts the electric regulating valve A or the electric regulating valve B so that the water flow forms a plurality of different gradients, and then repeats the flow measurement steps to determine whether the error value is accurate through multiple judgments; Calibration operation: adjust the water injection flow meter according to the water flow difference displayed on the console.

[0012] Preferably, the threshold value of the water flow rate measured in the flow channel B is 0-80 cubic meters per day; The threshold value of the water flow rate measured in the flow channel D is 80-1000 cubic meters per day.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the water injection flow meter is connected to the calibration device through the water injection pipeline, the water flows through the water injection pipeline, is measured once by the water injection flow meter, and then flows through the calibration device, and the calibration device distinguishes two detection channels according to the size of different flow rates, so as to facilitate more targeted measurement and improve measurement accuracy; The water flow rate measured by the calibration device is compared with the water flow rate measured by the water injection flow meter to determine the error of the water injection flow meter, and then calibration is performed. Multiple flow steps can be set in the calibration device to detect water flow rates from multiple aspects through different flow thresholds to ensure measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the calibration system of the intelligent water injection flowmeter for injection wells containing a Christmas tree according to the present invention; Figure 2 It is a schematic diagram of the internal structure of the calibration device of the present invention; Figure 3 It is a schematic diagram of the external structure of the calibration device of the present invention.

[0015] In the figure: 1. water outlet joint; 2. three-way pressure relief valve; 3. three-way joint A; 4. flow passage A; 5. electric regulating valve A; 6. standard meter flow meter A; 8. flow passage B; 9. flow passage C; 10. electric regulating valve B; 11. standard meter flow meter B; 13. flow passage D; 14. one-way valve; 15. three-way joint B; 16. water inlet joint; 101. calibration device; 102. touch screen; 103. partition; 104. handle; 201. water distribution room; 202. water injection flow meter; 203. water inlet pipeline; 204. water outlet pipeline; 205. water outlet interface; 206. gate valve A; 207. water injection pipeline; 208. gate valve B; 209. gate valve C; 210. gate valve D; 211. Christmas tree; 212. valve. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] At present, intelligent injection wells are used in the process of oil extraction. According to the underground oil storage conditions, quantitative water injection is carried out through the intelligent injection wells. Therefore, the water injection flow meter 202 calibration system has important uses in the field of oil extraction.

[0018] When the intelligent injection well is used for mining, water is injected into the ground, usually through a Christmas tree 211. The following is an example of a common Christmas tree 211: The Christmas tree 211 is connected to the water injection flow meter 202 through the water injection pipeline 207. Figure 1 As shown, the water injection pipeline 207 is disposed on the Christmas tree 211 in a surrounding manner, and gate valves A 206 , B 208 , C 209 , and D 210 are disposed at positions of the water injection pipeline 207 corresponding to the Christmas tree 211 .

[0019] See also Figures 1 to 3 The present invention provides an intelligent water injection flow meter calibration system and method for injection wells: The calibration system includes a control console, a water injection flow meter 202 and a calibration device 101 . The calibration device 101 includes a water inlet joint 16 . The water inlet joint 16 is connected to the water injection pipeline 207 through a water inlet pipeline 203 .

[0020] During normal water injection metering, water flows directly into the Christmas tree 211 through the water injection pipeline 207 and the flow rate is monitored by the water injection flow meter 202, which will not be described in detail here. The water injection flow meter 202 is generally set in the water distribution room 201.

[0021] When calibrating the water injection flow meter 202, first close the gate valve A206, gate valve B208 and gate valve C209, and open the gate valve D210 and valve 212. Figure 1 As shown, since the water injection pipeline 207 directly connected to the Christmas tree 211 is blocked, water flows into the calibration device 101 through the water inlet pipeline 203, and the water inlet pipeline 203 is connected to the water injection pipeline 207 through the water outlet interface 205.

[0022] The water inlet joint 16 is respectively connected to the flow channel B8 and the flow channel D13 through the three-way joint B15. When the water just flows into the calibration device 101, different flow channels need to be selected. The selection of the flow channel can be judged according to the water flow rate monitored by the water injection flow meter 202. The water injection flow meter 202 sends the monitored water flow rate to the control console, and the control console allocates it according to the thresholds set for the flow channel B8 and the flow channel D13. Generally speaking, the threshold for measuring the water flow rate of the flow channel B8 is 0-80 cubic meters per day, and the threshold for measuring the water flow rate of the flow channel D13 is 80-1000 cubic meters per day, which can be flexibly adjusted.

[0023] One end of the flow passage B8 away from the three-way connector B15 is connected to the flow passage A4, and an electric regulating valve A5 and a standard flow meter A6 are provided on the flow passage B8.

[0024] One end of the flow passage D13 away from the three-way connector B15 is connected to the flow passage C9, and the flow passage D13 is provided with an electric regulating valve B10 and a standard flow meter B11.

[0025] The control console closes the flow passage B8 by adjusting the electric regulating valve A5, and closes the flow passage D13 by adjusting the electric regulating valve B10.

[0026] For judging the water flow rate, the electric regulating valve A5 can be used to close the flow channel B8, and the standard flow meter B11 in the flow channel D13 can be used to monitor the water flow, and the monitoring result can be sent to the control console for adjustment. The control console will allocate it according to the thresholds set for the flow channel B8 and the flow channel D13. The principle is the same as above.

[0027] A one-way valve 14 is installed on the water inlet joint 16 , and the one-way valve 14 can prevent the water flowing into the calibration device 101 from flowing back.

[0028] The other end of the flow channel A4 and the other end of the flow channel C9 are both connected to the three-way joint A3, the other end of the three-way joint A3 is connected to the three-way pressure relief valve 2, one end of the three-way pressure relief valve 2 is connected to the water outlet joint 1, no matter which channel the water flow is monitored through, it will eventually flow to the three-way pressure relief valve 2, and the water outlet joint 1 is connected to the water injection pipeline 207 through the water outlet pipeline 204, so the water flow will flow into the oil production tree 211 through the water outlet pipeline 204, and will not affect the normal water injection of the oil production tree 211.

[0029] The water flow rate is measured by the standard meter flowmeter A6 or the standard meter flowmeter B11, and the data is transmitted to the control console. The control console collects the water flow rate of the water injection flowmeter 202, and compares the water flow rate detected by the water injection flowmeter 202 with the water flow rate detected by the standard meter flowmeter A6 or the standard meter flowmeter B11, so as to determine the error value of the water injection flowmeter 202.

[0030] The control console adjusts the electric regulating valve A5 or the electric regulating valve B10 to form a plurality of different gradients of water flow, and then repeats the flow measurement steps. Setting the flow gradient can bring the following advantages: Covering different flow conditions: The flow in the oil field water injection pipeline 207 is in dynamic change. By setting channels with different flow ranges and forming flow steps, various flow conditions that may occur in actual operation can be simulated. For example, the small flow channel 0-80 cubic meters per day and the large flow channel 80-1000 cubic meters per day can cover the flow differences between water injection wells at different production stages or between different wells, ensuring that the flow meter can be calibrated in a targeted manner in each typical flow interval, avoiding errors caused by a single calibration point or narrow range calibration that cannot adapt to complex flow changes.

[0031] Refined calibration process: At each flow step, the standard flow meter can accurately measure the actual flow value of the flow section and transmit the data to the control console. The control console simultaneously collects the measured value of the calibrated flow meter at the corresponding flow rate, compares the data of the two to perform indication interpretation, flow compensation and other operations. Since the calibration is performed at multiple discrete flow steps, compared with simple overall calibration, the measurement deviation law of the calibrated flow meter in different flow intervals can be analyzed more carefully, so as to adjust it more accurately and improve the accuracy and reliability of the calibration.

[0032] Improve linearity calibration effect: The measurement accuracy of the flow meter may not be completely linear within its range, that is, the error at different flow points is different. The flow step can be calibrated for different flow segments, which helps to correct the nonlinear error of the flow meter. By obtaining enough calibration data points on multiple flow steps, the actual measurement characteristic curve of the flow meter can be better fitted, thereby optimizing its measurement model, so that the measurement accuracy of the flow meter within the entire range is improved, effectively expanding the overall measurement accuracy range.

[0033] It can also improve the monitoring accuracy by monitoring multiple times with different flow gradients.

[0034] Then, according to the displayed error value, the control console sends instructions to the water injection flow meter 202 to automatically adjust, or the water injection flow meter 202 is manually adjusted according to the error value to calibrate the water injection flow meter 202.

[0035] This avoids the need to disassemble and install the water injection flow meter 202 during the calibration process, and avoids the risks of high-pressure leakage, mechanical damage, data line damage, etc. on site. At the same time, the online calibration device 101 can be connected in series to the water injection pipeline 207 without stopping the well. According to different flow rates, the electric regulating valves of different channels in the calibration device 101 are switched to control the flow rate, forming a flow step, and calibrating the flow meter in the pipeline.

[0036] At the same time, the calibration process does not affect the water injection work, thereby improving the efficiency of oil production.

[0037] The calibration device 101 is provided with a touch screen 102, a partition 103 and a handle 104. The touch screen 102 can facilitate the operator to view the parameters in the calibration device 101. The partition 103 can separate the components in the calibration device 101 from the outside to protect the internal components. The handle 104 can facilitate the operation of the calibration device 101.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An intelligent water injection flow meter calibration system for injection wells, characterized in that: It comprises a control console, a water injection flow meter (202) and a calibration device (101); The calibration device (101) comprises a water inlet joint (16), wherein the water inlet joint (16) is respectively connected to a flow passage B (8) and a flow passage D (13) via a three-way joint B (15), and a one-way valve (14) is installed on the water inlet joint (16); One end of the flow passage B (8) away from the three-way connector B (15) is connected to the flow passage A (4), and an electric regulating valve A (5) and a standard flow meter A (6) are provided on the flow passage B (8); One end of the flow passage D (13) away from the three-way connector B (15) is connected to the flow passage C (9), and an electric regulating valve B (10) and a standard flow meter B (11) are provided on the flow passage D (13); The other end of the flow passage A (4) and the other end of the flow passage C (9) are both connected to a three-way joint A (3); the other end of the three-way joint A (3) is connected to a three-way pressure relief valve (2); one end of the three-way pressure relief valve (2) is connected to a water outlet joint (1); The water injection flow meter (202) is connected to a water injection pipeline (207), and the water inlet joint (16) is connected to the water injection pipeline (207) via the water inlet pipeline (203); The control console is connected to the water injection flow meter (202), the electric regulating valve A (5), the standard meter flow meter A (6), the electric regulating valve B (10), and the standard meter flow meter B (11).

2. According to claim 1, the intelligent water injection flow meter calibration system for injection wells is characterized by: The standard flow meter A (6) and the electric regulating valve A (5) are arranged in sequence on the flow passage B (8).

3. According to claim 2, the intelligent water injection flow meter calibration system for injection wells is characterized by: The standard flow meter B (11) and the electric regulating valve B (10) are arranged in sequence on the flow passage D (13).

4. The intelligent water injection flow meter calibration system for injection wells according to claim 3 is characterized by: The water inlet pipeline (203) is provided with a valve (212).

5. The intelligent water injection flow meter calibration system for injection wells according to claim 4 is characterized in that: The valve (212) is connected to the control console.

6. The intelligent water injection flow meter calibration system for injection wells according to claim 5 is characterized by: The calibration device (101) is provided with a touch screen (102), a partition (103) and a handle (104).

7. A method for calibrating a water injection flow meter using the system described in any one of claims 1 to 6, characterized in that: The following steps are involved: Water injection measurement: water is injected into the water distribution room (201), and water flows into the water injection pipeline (207). The water injection flow meter (202) performs measurement and sends the measured data to the control console; Matching channel: water flows into the calibration device (101) through the water inlet pipeline (203), the water flow rate is measured by the standard flow meter B (11), and the measured data is sent to the control console, the control console matches the flow channel B (8) and the flow channel D (13) according to the flow range set in advance, and selects the flow channel B (8) or the flow channel D (13) to measure the water flow rate; Flow measurement: after the matching channels are completed, the water flow rate is measured by the standard meter flow meter A (6) or the standard meter flow meter B (11), and the data is transmitted to the control console, and the water flow rate measured by the water injection flow meter (202) is compared with the water flow rate detected by the standard meter flow meter A (6) or the standard meter flow meter B (11), so as to obtain an error value of the water injection flow meter (202); Setting flow steps: the control console adjusts the electric regulating valve A (5) or the electric regulating valve B (10) so that the water flow forms a plurality of different gradients, and then repeats the flow measurement step; Calibration operation: adjusting the water injection flow meter (202) according to the water flow difference displayed on the console.

8. The water injection flow meter calibration method according to claim 7, characterized in that: The threshold value of the water flow rate measured in the flow channel B (8) is 0-80 cubic meters per day; The threshold value for measuring water flow in the flow channel D (13) is 80-1000 cubic meters per day.

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