CN116026579A - On-line self-diagnosis method for faults of flow measurement and control valve - Google Patents
On-line self-diagnosis method for faults of flow measurement and control valve Download PDFInfo
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- CN116026579A CN116026579A CN202111246888.3A CN202111246888A CN116026579A CN 116026579 A CN116026579 A CN 116026579A CN 202111246888 A CN202111246888 A CN 202111246888A CN 116026579 A CN116026579 A CN 116026579A
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Abstract
The invention provides a fault on-line self-diagnosis method of a flow measurement and control valve, which comprises the following steps: detecting the flow and pressure difference flowing through the valve in real time; calculating a flow coefficient Kv value of a valve core of the valve according to the flow and the pressure difference; comparing the Kv value of the flow coefficient with the corresponding initial value of the standard flow coefficient under the flow to obtain a flow coefficient error; and determining the abrasion condition of the valve core according to the flow coefficient error. The on-line real-time monitoring is realized, the fault can be found in time, hidden danger is avoided, stable and reliable water injection of the oil field is realized, and the water injection development effect is ensured.
Description
Technical Field
The invention relates to the field of pipeline flow measurement and control, in particular to an online self-diagnosis method for a flow measurement and control valve fault.
Background
The flow control valve is a multifunctional valve for controlling flow by adopting a high-precision pilot mode. The valve is suitable for a pipeline of a water distribution pipe, the flow and the pressure of which need to be controlled, the preset flow is kept unchanged, the excessive flow is limited to a preset value, the upstream high pressure is properly reduced, and the flow downstream of the main valve is not influenced even if the pressure upstream of the main valve changes. The connection mode is divided into flange type, screw thread type and welding type. The valve realizes the functions of diversion, cut-off, throttling, check, diversion or overflow pressure relief by changing the section of the passage and the flow direction of the medium, so the valve is also a control component in a pipeline fluid conveying system.
At present, the valves used for fluid control are various in variety and specification, from the simplest stop valve to various valves used in extremely complex automatic control systems, and the working pressure of the valves can be from 0.0013MPa to 1000MPa of ultrahigh pressure, and the working temperature can be from the ultralow temperature of-269 ℃ to the high temperature of 1430 ℃. In addition, the control and adjustment of the valve can adopt various transmission modes, such as manual operation, electric operation, pneumatic operation, hydraulic operation, electromagnetic operation, electro-hydraulic operation, electromagnetic hydraulic operation, turbine operation, pneumatic and hydraulic operation and the like; the valve can also act according to preset requirements under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can enable the opening and closing piece to do lifting, sliding, swinging or rotating movement by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve is changed to realize a control function.
The water injection development is a mainstream development mode of the current oil field, in order to ensure stable water injection of a single well, a flow measurement and control valve is arranged on a single well water injection pipeline, the service time and the injection water quality are influenced, the measurement and control valve can have the fault problem of abrasion of a valve core, the situation that flow leakage still exists after a switch is not tight or is closed can be caused, and the water injection development effect is influenced. Such faults are generally difficult to discover and troubleshoot.
Disclosure of Invention
In view of the above, the present invention has been made to provide an online self-diagnosis method for a failure of a flow measurement and control valve that overcomes or at least partially solves the above-mentioned problems.
According to one aspect of the present invention, there is provided an online self-diagnosis method for a flow measurement and control valve fault, the self-diagnosis method comprising:
detecting the flow and pressure difference flowing through the valve in real time;
calculating a flow coefficient Kv value of a valve core of the valve according to the flow and the pressure difference;
comparing the Kv value of the flow coefficient with the corresponding initial value of the standard flow coefficient under the flow to obtain a flow coefficient error;
and determining the abrasion condition of the valve core according to the flow coefficient error.
Optionally, calculating the flow coefficient Kv value of the valve core of the valve according to the flow and the pressure difference specifically includes:
the calculation formula of the Kv value of the flow coefficient is
Wherein: q is the volume flow measured in cubic meters per hour m 3 /h；ΔP kv Is 10 5 Static pressure loss of Pa; Δp is the static pressure loss measured across the valve in Pa; ρ is the fluid density in kilograms per cubic meter kg/m 3 ；ρ w Is water density 1000kg/m 3 In kg/m per cubic meter 3 。
Optionally, comparing the value of the flow coefficient Kv with a corresponding standard flow coefficient initial value under the flow, and obtaining a flow coefficient error specifically includes:
flow coefficient error= (the flow coefficient Kv value-standard flow coefficient initial value)/standard flow coefficient initial value.
Optionally, the determining the wear condition of the valve core according to the flow coefficient error specifically includes:
when the flow coefficient error is 1% -10%, the valve core is slightly worn and leaked;
when the flow coefficient error is 11% -30%, the valve core is in moderate abrasion leakage;
when the flow coefficient error is 31% -50%, the valve core is severely worn and leaked.
The invention provides a fault on-line self-diagnosis method of a flow measurement and control valve, which comprises the following steps: detecting the flow and pressure difference flowing through the valve in real time; calculating a flow coefficient Kv value of a valve core of the valve according to the flow and the pressure difference; comparing the Kv value of the flow coefficient with the corresponding initial value of the standard flow coefficient under the flow to obtain a flow coefficient error; and determining the abrasion condition of the valve core according to the flow coefficient error. The on-line real-time monitoring is realized, the fault can be found in time, hidden danger is avoided, stable and reliable water injection of the oil field is realized, and the water injection development effect is ensured.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a fault online self-diagnosis method for a flow measurement and control valve provided by an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terms "comprising" and "having" and any variations thereof in the description embodiments of the invention and in the claims and drawings are intended to cover a non-exclusive inclusion, such as a series of steps or elements.
The technical scheme of the invention is further described in detail below with reference to the accompanying drawings and the examples.
As shown in fig. 1, the calculation formula using the valve element flow coefficient Kv value is as follows
The faults of the flow measurement and control valve are classified into three grades of mild, moderate and severe according to the abrasion degree. And in a laboratory, respectively testing the Kv values of the flow coefficients of the three grades of measurement and control valves under different flows, and establishing a flow coefficient numerical library under fault conditions.
And measuring the flow value flowing into the measurement and control valve by using a flowmeter on the flow pipeline, and transmitting the measurement result to a flow integrating and controller. The flow integrating and controller may input the density of the fluid.
The inlet and outlet pressure sensors on the flow pipeline are used for measuring the pressure difference at two ends of the measurement and control valve and transmitting the measurement result to the flow integrating and controller.
Calculating a flow coefficient Kv value under a corresponding working condition by the flow integrating and controller, automatically comparing and calculating the flow coefficient Kv value with a standard flow coefficient initial value in a numerical library, and determining a flow coefficient error= (the flow coefficient Kv value under the corresponding working condition-the standard flow coefficient initial value)/the standard flow coefficient initial value, wherein when the flow coefficient error is 1% -10%, the measurement and control valve is slightly worn and leaked; when the flow coefficient error is 11% -30%, the measurement and control valve is in moderate abrasion leakage; when the flow coefficient error is 31% -50%, the measuring and controlling valve is severely worn and leaked, and the working condition of the measuring and controlling valve is determined. If the fault is in the fault working condition, the fault degree is displayed on the display screen according to the fault type and severity, and the fault degree mainly means slight, moderate and serious display and alarm.
The beneficial effects are that:
1. the online self-diagnosis method for the abrasion of the valve core is formed, and the problem that the abrasion of the valve core of the valve is difficult to find and check is solved.
2. A database of the relation between the Kv value of the flow coefficient and the abrasion loss of the valve core is established through an indoor experiment, so that the abrasion condition of the valve core of the valve can be judged based on the Kv value, and the investigation speed of the abrasion condition of the valve core is effectively improved.
3. The on-line real-time monitoring is realized, the fault can be found in time, hidden danger is avoided, stable and reliable water injection of the oil field is realized, and the water injection development effect is ensured.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, and it should be understood that the invention is not limited to the particular embodiments disclosed, but is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the invention.
Claims (4)
1. The on-line self-diagnosis method for the faults of the flow measurement and control valve is characterized by comprising the following steps of:
detecting the flow and pressure difference flowing through the valve in real time;
calculating a flow coefficient Kv value of a valve core of the valve according to the flow and the pressure difference;
comparing the Kv value of the flow coefficient with the corresponding initial value of the standard flow coefficient under the flow to obtain a flow coefficient error;
and determining the abrasion condition of the valve core according to the flow coefficient error.
2. The online self-diagnosis method for failure of a flow measurement and control valve according to claim 1, wherein calculating a flow coefficient Kv value of a spool of the valve according to the flow and the pressure difference specifically comprises:
the calculation formula of the Kv value of the flow coefficient is
Wherein: q is the volume flow measured in cubic meters per hour m 3 /h；ΔP kv Is 10 5 Static pressure loss of Pa; Δp is the static pressure loss measured across the valve in Pa; ρ is the fluid density in kilograms per cubic meter kg/m 3 ；ρ w Is water density 1000kg/m 3 In kg/m per cubic meter 3 。
3. The online self-diagnosis method for fault of flow measurement and control valve according to claim 1, wherein comparing the value of the flow coefficient Kv with the corresponding initial value of the standard flow coefficient under the flow, obtaining the flow coefficient error specifically comprises:
flow coefficient error= (the flow coefficient Kv value-standard flow coefficient initial value)/standard flow coefficient initial value.
4. The online self-diagnosis method for failure of a flow measurement and control valve according to claim 1, wherein the determining the wear condition of the valve core according to the flow coefficient error specifically comprises:
when the flow coefficient error is 1% -10%, the valve core is slightly worn and leaked;
when the flow coefficient error is 11% -30%, the valve core is in moderate abrasion leakage;
when the flow coefficient error is 31% -50%, the valve core is severely worn and leaked.
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| CN202111246888.3A CN116026579A (en) | 2021-10-26 | 2021-10-26 | On-line self-diagnosis method for faults of flow measurement and control valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268743A (en) * | 2023-11-22 | 2023-12-22 | 山东力威液压技术有限公司 | Fault diagnosis method for proportional flow valve |
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2021
- 2021-10-26 CN CN202111246888.3A patent/CN116026579A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117268743A (en) * | 2023-11-22 | 2023-12-22 | 山东力威液压技术有限公司 | Fault diagnosis method for proportional flow valve |
| CN117268743B (en) * | 2023-11-22 | 2024-02-09 | 山东力威液压技术有限公司 | Fault diagnosis method for proportional flow valve |
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