Underwater throttle valve CV flow characteristic curve testing system and flow adjusting method

Abstract

The invention discloses an underwater throttle valve CV flow characteristic curve testing system and a flow adjusting method. The underwater throttle valve CV flow characteristic curve testing system comprises an underwater throttle valve assembly, a throttle valve hydraulic stepping driving and opening signal detecting module and a CV testing and CV value accuracy judging and calculating module. The underwater throttle valve assembly comprises a stepping driver assembly and a valve body assembly, a valve element cage sleeve and a valve element plunger are arranged in the valve body assembly, the valve element plunger is arranged in the valve element cage sleeve, the stepping driver assembly is connected with one end of the valve element plunger, and the stepping driver assembly can drive the valve element plunger to move in the axial direction of the valve element cage sleeve. A flow adjusting hole is formed in the valve element cage sleeve in the circumferential direction, and the valve element plunger can adjust the exposed area of the flow adjusting hole. The throttle valve hydraulic stepping drive and opening signal detection module is connected with the opening input end of the underwater throttle valve assembly; and the CV test and CV value accuracy judgment and calculation module is connected with the high-pressure water pump and the low-pressure flowmeter.

Description

Technical Field

[0001] The present application relates to the technical field of offshore oil and natural gas exploration and drilling, and more specifically, to an underwater throttle valve CV flow characteristic curve testing system and a flow regulation method. Background Art

[0002] The CV value indicates the flow capacity of the component to the liquid, that is, the flow coefficient. The existing CV test device is mainly used for CV testing of regulating valves with large throttling apertures in low-pressure pipelines on land and low-pressure and large throttling apertures in the chemical industry. The test device has a low pressure level and a large low-pressure flow meter range.

[0003] When using the existing CV test device to test the CV of the underwater oil and gas production throttle valve, there will be a problem that the flow through the throttle valve cannot be detected when the underwater throttle valve is small due to low pressure and large flow of the low-pressure flow meter. Moreover, in the CV test process of the existing technology, the throttle valve opening is manually adjusted to test the CV of the regulating valve at various openings. The opening adjustment error is large, resulting in an inaccurate CV opening characteristic curve, which cannot meet the high-pressure and small throttle valve aperture underwater throttle valve CV precision testing requirements in the oil and gas production industry.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0005] One purpose of the present application is to provide a new technical solution for an underwater throttle valve CV flow characteristic curve testing system.

[0006] According to the first aspect of the present application, a system for testing the CV flow characteristic curve of an underwater throttle valve is provided. The system for testing the CV flow characteristic curve of an underwater throttle valve comprises an underwater throttle valve assembly, a throttle valve hydraulic stepping drive and opening signal detection module, and a CV test and CV value accuracy judgment calculation module; the underwater throttle valve assembly comprises a stepping driver assembly and a valve body assembly, the valve body assembly has a throttle valve inlet and a throttle valve outlet, the throttle valve inlet is connected to an inlet test pipe, the throttle valve outlet is connected to an outlet test pipe, the inlet test pipe and the outlet test pipe are provided with detection components, a valve core cage and a valve core plunger are provided in the valve body assembly, the valve core plunger is provided in the valve core cage, the stepping driver assembly is connected to one end of the valve core plunger, and the stepping driver assembly can drive the valve core plunger to move along the valve core cage. The valve core cage moves in the axial direction, and the valve core cage is provided with a flow regulating hole along the circumferential direction, and the valve core plunger can adjust the exposed area of ​​the flow regulating hole; a throttle valve hydraulic stepping drive and opening signal detection module, the throttle valve hydraulic stepping drive and opening signal detection module is connected to the opening input end of the underwater throttle valve assembly, and the throttle valve hydraulic stepping drive and opening signal detection module can collect the opening and corresponding steps of the underwater throttle valve assembly; a CV test and CV value accuracy judgment calculation module, the CV test and CV value accuracy judgment calculation module are connected to the high-pressure water pump and low-pressure flowmeter of the detection component, and the CV test and CV value accuracy judgment calculation module can collect the CV value of the underwater throttle valve assembly.

[0007] Optionally, the valve body assembly includes a valve body and a valve stem, the valve core cage is arranged in the valve body, the throttle valve inlet is connected with the throttle valve outlet through the flow regulating hole, the valve core plunger is arranged in the valve core cage, one end of the valve core plunger extends out of the valve core cage and is connected to the valve stem, and the end of the valve stem away from the valve core plunger is connected to the stepping drive assembly.

[0008] Optionally, the detection component includes the high-pressure water pump, the low-pressure flowmeter, a thermometer, a first pressure gauge, a second pressure gauge and a third pressure gauge, the high-pressure water pump, the thermometer, the low-pressure flowmeter, the first pressure gauge, the second pressure gauge and the third pressure gauge are respectively connected to the CV test and CV value accuracy judgment calculation module, the distance from the first pressure gauge to the throttle valve inlet is the sum of the distance from the second pressure gauge to the throttle valve inlet and the distance from the third pressure gauge to the throttle valve outlet; the high-pressure water pump, the thermometer, the low-pressure flowmeter, the first pressure gauge and the second pressure gauge are arranged in the inlet test pipe, the high-pressure water pump, the thermometer, the low-pressure flowmeter, the first pressure gauge and the second pressure gauge are successively close to the throttle valve inlet, and the third pressure gauge is arranged in the outlet test pipe.

[0009] Optionally, the stepper drive assembly includes an LVDT displacement sensor, and the LVDT displacement sensor is connected to the valve stem.

[0010] Optionally, the throttle valve hydraulic stepping drive and opening signal detection module includes an opening communication module, an opening signal acquisition module, a driver pressure acquisition module, an HPU pulse hydraulic system, a solenoid valve control module, an open circuit output pressure sensor, a closed circuit output pressure sensor, an open circuit two-position three-way solenoid valve, and a closed circuit two-position three-way solenoid valve; the opening signal acquisition module is connected to the LVDT displacement sensor, the driver pressure acquisition module is connected to the open circuit output pressure sensor and the closed circuit output pressure sensor respectively, the HPU pulse hydraulic system is connected to the opening signal acquisition module and the driver pressure acquisition module respectively, the HPU pulse hydraulic system is connected to the solenoid valve control module, and the solenoid valve control module controls the open circuit two-position three-way solenoid valve and the closed circuit two-position three-way solenoid valve.

[0011] Optionally, the CV test and CV value accuracy judgment calculation module includes a CV communication module, a CV calculation and CV value accuracy judgment calculation module, a pressure signal acquisition module, and a flow control and acquisition module; the pressure signal acquisition module and the flow control and acquisition module are respectively connected to the CV calculation and CV value accuracy judgment calculation module, the thermometer, the first pressure gauge, the second pressure gauge and the third pressure gauge are respectively connected to the pressure signal acquisition module, and the high-pressure water pump and the low-pressure flow meter are respectively connected to the flow control and acquisition module.

[0012] Optionally, the underwater throttle valve CV flow characteristic test system includes the throttle valve hydraulic stepping drive and opening signal detection module and the CV test and CV value accuracy judgment calculation module, and the CV test and CV value accuracy judgment calculation module can judge the upper limit pressure difference and the lower limit pressure difference; the method for the CV test and CV value accuracy judgment calculation module to judge the upper limit pressure difference includes: determining the upper limit blocking pressure difference value and the calculation formula Through actual test, the pressure difference △P is less than △P choke The blocking pressure difference is compared to limit the accuracy of the CV test value. The test pressure difference value higher than the blocking pressure difference is screened out through system programming to ensure that the pressure difference value input for the test CV value calculation is less than the blocking pressure difference, thereby ensuring the accuracy of the test CV. LP is the throttle valve flow recovery coefficient, the F P is the pipeline geometry correction factor, the P b is the throttle valve inlet pressure value, the P V is the absolute vapor pressure of the medium at the inlet temperature, the F F Liquid critical compression ratio coefficient, The Pc is the absolute thermodynamic critical pressure; the CV test and CV value accuracy judgment calculation module determines the lower limit pressure difference by programming counting Reynolds coefficient, the lower limit pressure difference of the CV test process is judged by the flow Reynolds coefficient value greater than 10000. When the pressure difference is less than the lower limit pressure difference, the medium flow Reynolds coefficient is less than 10000, and the flow channel medium flow is laminar flow. When the pressure difference is greater than the lower limit pressure difference, the medium flow Reynolds coefficient is greater than 10000, and the flow channel medium flow is turbulent. Through system program programming, the test pressure difference of the medium flow Reynolds coefficient less than 10000 in the test process is screened out, and the test pressure difference of the flow channel medium flow is laminar flow, ensuring that the pressure difference calculated by the CV test is greater than the test pressure of the flow channel medium flow Reynolds coefficient greater than 10000, and the flow channel medium flow is turbulent, ensuring high CV test accuracy, wherein, the F d is the throttle correction factor, the F L is the throttle valve flow recovery coefficient, the CV is the CV value tested at this opening, the Q is the medium flow through the underwater throttle valve at this opening; υ is the kinematic viscosity of the medium at the inlet temperature, and D is the inlet pipe diameter; the CV value and the corresponding opening between the upper limit pressure difference and the lower limit pressure difference are obtained, the underwater throttle valve CV flow characteristic test system is programmed to draw the CV and the opening curve of the underwater throttle valve, and the CV characteristic curve of the underwater throttle valve assembly is output.

[0013] According to a second aspect of the present application, a flow regulation method is provided, which includes the underwater throttle valve CV flow characteristic testing system as described above.

[0014] Optionally, the flow rate regulation method comprises: Step 1: according to the oil and gas well production parameters, according to The flow characteristic calculation formula calculates the CV value of the oil and gas well corresponding to the production adjustment demand, wherein the Qc is the production, the △Pc is the pressure difference between the throttle valve inlet and the throttle valve outlet, and the Gfc is the parameter of the oil and gas well medium density; Step 2: Combined with the CV flow characteristic curve of the underwater throttle valve, determine the adjustment opening and throttle valve step corresponding to the CV value of the underwater throttle valve.

[0015] In the embodiment of the present application, the valve core plunger is driven to move in the valve core cage by the stepping driver assembly to adjust the size of the exposed area of ​​the flow regulating hole, thereby adjusting the flow rate. At the same time, a modular design of a high-pressure and low-flow CV test and CV value accuracy judgment calculation module and a throttle valve hydraulic stepping drive and opening signal detection module is adopted to perform hydraulic stepping drive on the tested underwater throttle valve assembly and accurately detect the corresponding step opening electrical signal, and determine the CV value of the underwater throttle valve assembly at each opening and corresponding step number.

[0016] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0018] Figure 1 It is a schematic diagram of the connection between the underwater throttle valve CV flow characteristic curve testing device and the underwater throttle valve CV flow characteristic testing system in the embodiment of the present application;

[0019] Figure 2 yes Figure 1 The enlarged schematic diagram of the circled part;

[0020] Figure 3 is a structural schematic diagram of an underwater throttle valve assembly in an embodiment of the present application;

[0021] Figure 4 is a schematic cross-sectional structure diagram of an underwater throttle valve assembly in an embodiment of the present application;

[0022] Figure 5 It is a schematic diagram of a throttle valve hydraulic stepping drive and opening signal detection module in an embodiment of the present application;

[0023] Figure 6 Schematic diagram of the CV test and CV value accuracy judgment calculation module in the embodiment of the present application;

[0024] Figure 7It is a CV characteristic curve diagram of the underwater throttle valve automatically detected in the embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1-Underwater throttle valve assembly;

[0027] 11-stepping driver assembly; 1101-LVDT displacement sensor; 1102-driving spindle; 1103-driving main gear; 1104-driving pawl; 1105-pawl pin; 1106-piston; 1107-dual-hole oil cylinder; 1108-driving arm; 1109-elastic member; 1110-torsion spring; 1111-pawl disengagement pin; 1112-electric thru-thru wet plug connector;

[0028] 12-valve body assembly; 121-valve core cage; 1211-flow regulating hole; 122-valve core plunger; 123-valve body; 124-valve stem; 125-valve cover; 126-valve stem connector; 127-valve stem nut;

[0029] 2-Inlet test pipe;

[0030] 3-Export test pipe;

[0031] 4-detection component; 41-high pressure water pump; 42-low pressure flow meter; 43-thermometer; 44-first pressure gauge; 45-second pressure gauge; 46-third pressure gauge;

[0032] 5-throttle valve hydraulic stepping drive and opening signal detection module; 501-opening communication module; 502-opening signal acquisition module; 503-driver pressure acquisition module; 504-HPU pulse hydraulic system; 505-solenoid valve control module; 506-open circuit output pressure sensor; 507-closed circuit output pressure sensor; 508-open circuit two-position three-way solenoid valve; 509-closed circuit two-position three-way solenoid valve; 510-hydraulic system pressure gauge; 511-hydraulic accumulator; 512-second hydraulic filter; 513-first hydraulic filter; 514-circulating hydraulic pump; 515-oil tank;

[0033] 6-CV test and CV value accuracy judgment calculation module; 61-CV communication module; 62-CV calculation and CV value accuracy judgment calculation module; 63-pressure signal acquisition module; 64-flow control and acquisition module;

[0034] 7- underwater throttle valve CV flow characteristic test system; 71- first valve; 72- elbow; 73- second valve; 74- pipeline; 75- drain valve;

[0035] 8-Water tank assembly;

[0036] 9- Water filtration system. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] According to one embodiment of the present application, an underwater throttle valve CV flow characteristic curve testing system is provided, which includes an underwater throttle valve assembly 1, a throttle valve hydraulic stepping drive and opening signal detection module 5, and a CV test and CV value accuracy judgment calculation module 6. The underwater throttle valve assembly 1 includes a stepper drive assembly 11 and a valve body assembly 12, wherein the valve body assembly 12 has a throttle valve inlet and a throttle valve outlet, wherein the throttle valve inlet is connected to an inlet test pipe 2, wherein the throttle valve outlet is connected to an outlet test pipe 3, wherein the inlet test pipe 2 and the outlet test pipe 3 are provided with a detection component 4, wherein a valve core cage 121 and a valve core plunger 122 are provided in the valve body assembly 12, wherein the valve core plunger 122 is provided in the valve core cage 121, wherein the stepper drive assembly 11 is connected to one end of the valve core plunger 122, wherein the stepper drive assembly 11 can drive the valve core plunger 122 to move along the axial direction of the valve core cage 121. Directional movement, the valve core cage 121 is provided with a flow regulating hole 1211 along the circumferential direction, and the valve core plunger 122 can adjust the exposed area of ​​the flow regulating hole 1211; the throttle valve hydraulic stepping drive and opening signal detection module 5 is connected to the opening input end of the underwater throttle valve assembly 1, and the throttle valve hydraulic stepping drive and opening signal detection module 5 can collect the opening and corresponding steps of the underwater throttle valve assembly 1; the CV test and CV value accuracy judgment calculation module 6 is connected to the high-pressure water pump 41 and the low-pressure flowmeter 42 of the detection component 4, and the CV test and CV value accuracy judgment calculation module 6 can collect the CV value of the underwater throttle valve assembly 1.

[0043] like Figures 1 to 4 As shown, the underwater throttle valve assembly 1 includes a stepping drive assembly 11 and a valve body assembly 12. The stepping drive assembly 11 provides driving force for the valve body assembly 12 to adjust the flow through the valve body assembly 12.

[0044] The valve body assembly 12 has a throttle valve inlet and a throttle valve outlet. The throttle valve inlet is arranged on one side of the valve body assembly 12 , and the throttle valve outlet is arranged at the bottom of the valve body assembly 12 .

[0045] A detection assembly 4 is provided on the inlet test pipe 2 and the outlet test pipe 3 to detect information such as the flow value, pressure value, etc. of the liquid entering the valve body assembly 12 and exiting the valve body assembly 12 .

[0046] like Figures 2 to 4 As shown, the left end of the inlet test pipe 2 is connected to the low-pressure flowmeter 42 by a flange, and the right end is connected to the inlet of the test sample underwater throttle valve assembly 1 by a flange. The inner hole diameter specification size of the inlet test pipe 2 is consistent with the nominal through hole size of the test sample underwater throttle valve assembly 1 to prevent the accuracy of the CV test result from being affected by different pipe diameters.

[0047] like Figures 2 to 4 As shown, the front end of the outlet test pipe 3 is connected to the outlet of the test sample underwater throttle valve assembly 1 by a flange, and the rear end of the outlet test pipe 3 is connected to the elbow 72.

[0048] like Figures 2 to 4 As shown, the valve body assembly 12 includes a valve core cage 121 and a valve core plunger 122. The flow regulating holes 1211 are evenly distributed within the specified stroke in the circumferential vertical direction of the valve core cage 121. The valve core plunger 122 is arranged in the valve core cage 121. One end of the valve core plunger 122 is inserted into the valve core cage 121, and the other end is connected to the bottom of the stepping driver assembly 11. The valve core plunger 122 is driven by the driver assembly to move linearly up and down in the valve core cage 121. The valve core plunger 122 moves linearly up and down in the valve core cage 121 to realize the exposed area of ​​the flow regulating holes 1211 on the valve core cage 121, thereby realizing the flow regulating function.

[0049] The throttle valve hydraulic stepping drive and opening signal detection module 5 is connected to the stepping driver assembly 11, so that the stepping driver assembly 11 has the valve core plunger 122 hydraulic stepping drive function and the valve core plunger 122 displacement precise detection and signal feedback function, thereby realizing the throttle valve opening precise control and opening signal detection.

[0050] The CV test and CV value accuracy judgment calculation module 6 is connected to the high-pressure water pump 41 and the low-pressure flow meter 42. The pressure value of the high-pressure water pump 41 is 14MPa, and the flow rate of the low-pressure flow meter 42 is 1m 3 / h, through CV test and CV value accuracy judgment calculation module 6 can determine the CV value of the underwater throttle valve assembly 1 at various openings and corresponding steps, and automatically draw the CV flow characteristic curve corresponding to the precise CV and opening and number of steps of the underwater throttle valve.

[0051] In the embodiment of the present application, a method of adding a high-pressure water pump 41 and a low-pressure flowmeter 42 is adopted to increase the test pressure and improve the low-flow detection accuracy. While ensuring the accurate flow value of the low flow, the pressure of the test loop is increased to obtain a high test pressure difference, ensure that the test loop medium is turbulent flow, and prevent the test pressure difference from being lower than the lower limit pressure difference of laminar flow, which affects the CV test accuracy.

[0052] like Figures 2 to 4 As shown, the stepper drive assembly 11 includes a driving main shaft 1102 , a driving main gear 1103 , a driving pawl 1104 , a pawl pin 1105 , a piston 1106 , a double-hole cylinder 1107 , a driving arm 1108 , an elastic member 1109 , a torsion spring 1110 and a pawl disengagement pin 1111 .

[0053] like Figures 2 to 4As shown, the inner hole at the lower end of the driving main shaft 1102 is provided with two keyways, which are connected to the upper part of the valve stem nut 127 by using two keys. The upper outer diameter of the driving main shaft 1102 has two symmetrical keyways and is connected and fixed to the driving main gear 1103 by using two keys, so as to transmit the rotational motion of the driving main gear 1103 to the valve stem nut 127 for rotational motion.

[0054] like Figures 2 to 4 As shown, the inner hole of the driving main gear 1103 is symmetrically distributed with two keyways, which are connected and fixed to the driving main shaft 1102 through a key. The circumference of the driving main gear 1103 has 24 gear teeth, which cooperate with the driving pawl 1104 to realize the stepping driving function.

[0055] like Figures 2 to 4 As shown, the inner hole of the driving pawl 1104 is installed on the driving arm 1108 through the pawl pin 1105, and the driving pawl 1104 can rotate freely on the driving arm 1108. A torsion spring 1110 is installed on the pawl pin 1105, which can drive the pawl 1104 to engage with the driving main gear 1103 to realize hydraulic stepping drive. When the throttle valve hydraulic stepping drive and opening signal detection module 5 does not press the double-hole oil cylinder 1107, the first tooth of the driving pawl 1104 cooperates with the pawl disengagement pin 1111, and the driving pawl 1104 is driven by the elastic member 1109 to disengage from the driving main gear 1103. The following stepping drive functions are realized: the throttle valve hydraulic stepping drive and opening signal detection module 5 does not pressurize the double-hole cylinder 1107 to push the piston 11061-14 to drive the drive arm 1108 to move linearly to drive the drive pawl 1104 to disengage the pawl disengagement pin 1111 and engage with the drive main gear 1103, and drive the drive main gear 1103 to rotate a certain angle, and then the double-hole cylinder 1107 releases pressure to zero, and the spring pushes the drive arm 1108 to drive the drive pawl 1104 to the reset position, and the pawl disengagement pin 1111 stimulates the drive pawl 1104 to disengage from the drive main gear 1103, and the throttle valve hydraulic step number is set by the throttle valve hydraulic stepping drive and opening signal detection module 5 to provide pulse hydraulic pressure, driving the throttle valve from open to closed, or from closed to open.

[0056] like Figures 2 to 4 As shown, the two ends of the outer diameter of the pawl pin 1105 cooperate with the driving arm 1108, and the pawl pin 1105 is prevented from falling off by the retaining spring. The middle part of the outer diameter of the pawl pin 1105 rotates with the inner diameter of the driving pawl 1104, so that the driving pawl 1104 is installed on the driving arm 1108, and the pawl rotates along the pawl pin 1105 on the driving arm 1108, so as to transmit the linear motion force of the driving arm 1108 to drive the driving pawl 1104 to move linearly.

[0057] like Figures 2 to 4As shown, the double-hole oil cylinder 1107 is internally integrated with two oil cylinders, an open-circuit drive oil cylinder and a closed-circuit drive oil cylinder, and each oil cylinder is designed with a hydraulic through hole and an interface. It is connected to the open-circuit hydraulic control circuit and the closed-circuit control circuit of the throttle valve hydraulic stepping drive and opening signal detection module 5 through a hydraulic pipeline. A piston 1106 is installed inside each oil cylinder, and the piston 1106 seal cooperates with the piston 1106 seal to drive the hydraulic drive piston 1106 to move linearly to drive the driving pawl 1104 to move forward, so that the pawl pin 1105 is meshed with the driving main gear 1103 and drives the driving main gear 1103 to rotate a certain angle to realize the hydraulic stepping drive function.

[0058] like Figures 2 to 4 As shown, the outer diameter of the piston 1106 cooperates with the inner hole of the double-hole oil cylinder 1107 through a piston seal to protect both the open-circuit piston and the pipeline piston. The front end of the piston 1106 is connected to the drive arm 1108 through a thread to transmit the hydraulic drive force to the drive arm 1108.

[0059] like Figures 2 to 4 As shown, the rear end of the driving arm 1108 is threaded and connected to the piston 1106. The middle of the driving arm 1108 is provided with a pin hole to cooperate with the pawl pin 1105. The front end of the driving arm 1108 is designed with a spring installation groove to cooperate with the elastic member 1109;

[0060] like Figures 2 to 4 As shown, the elastic member 1109 is a spring. The front end of the spring cooperates with the mounting slot of the driving arm 1108 to provide the piston 1106 with a reset elastic force and the driving pawl 1104 with a reset disengagement force to drive the main gear 1103, so as to realize the entire hydraulic stepping drive function.

[0061] like Figures 2 to 4 As shown, the inner hole of the torsion spring 1110 cooperates with the outer diameter of the pawl pin 1105 to achieve the fixed position of the torsion spring 1110. The torsion spring 1110 has a fixed arm and a twisting arm. The fixed arm is in plane contact with the driving arm 1108 to provide support and fixation for the fixed arm of the torsion spring 1110. The twisting arm is in contact with the concave plane on the back of the driving pawl 1104 to provide a torsional force, which stimulates the driving pawl 1104 to mesh with the driving main gear 1103 to achieve the ratchet driving function.

[0062] like Figures 2 to 4As shown, the pawl disengagement pin 1111 is installed inside the throttle valve stepper driver assembly 11, and the outer diameter of the pawl disengagement pin 1111 cooperates with the first tooth of the pawl pin 1105. When the spring force pushes the first tooth of the driving pawl 1104 to contact the pawl disengagement pin 1111, the driving pawl 1104 is stimulated to disengage from the driving main gear 1103, so that the double-hole cylinder 1107 is always disengaged from the driving main gear 1103 when it is driven by the throttle valve hydraulic stepper drive and the pulse hydraulic pressure provided by the opening signal detection module 5, so as to prevent the open circuit and the closed circuit drives from interfering with each other and affecting the function of the hydraulic stepper drive throttle valve to start.

[0063] The stepper driver assembly 11 drives the valve core plunger 122 to move linearly up and down in the valve core cage 121 to adjust the exposed area of ​​the circumferential flow hole in the valve core cage 121 to achieve the flow regulation function. The stepper driver assembly 11 has the function of hydraulic stepping drive of the valve core plunger 122 and the function of accurate displacement detection and model feedback of the valve core plunger 122, so as to achieve accurate control of the throttle valve opening and detection of the opening model.

[0064] In the embodiment of the present application, a modular design of a high-pressure and low-flow CV test and CV value accuracy judgment calculation module 6 and a throttle valve hydraulic stepping drive and opening signal detection module 5 is adopted to perform hydraulic stepping drive and accurate detection of the corresponding step opening electrical signal 4-20ma (corresponding to an opening of 0-100%) on the tested underwater throttle valve assembly 1, measure the CV value of the underwater throttle valve assembly 1 at each opening and the corresponding number of steps, and automatically draw the CV flow characteristic curve corresponding to the precise CV value of the underwater throttle valve assembly 1 and the opening and the number of steps.

[0065] In one example, the valve body assembly 12 includes a valve body 123 and a valve stem 124, the valve core cage 121 is arranged in the valve body 123, the throttle valve inlet is connected to the throttle valve outlet through the flow regulating hole 1211, the valve core plunger 122 is arranged in the valve core cage 121, one end of the valve core plunger 122 extends out of the valve core cage 121 and is connected to the valve stem 124, and the end of the valve stem 124 away from the valve core plunger 122 is connected to the stepping drive assembly 11.

[0066] like Figures 2 to 4 As shown, a cavity is provided in the valve body 123, and the throttle valve inlet and the throttle valve outlet are both connected to the cavity. The valve core cage 121 is located in the valve body 123, and the flow regulating hole 1211 is connected to the throttle valve inlet. In other words, the liquid enters the valve body 123 and enters the valve core cage 121 through the flow regulating hole 1211, and flows to the throttle valve outlet through the inner hole of the valve core cage 121. The valve core plunger 122 moves linearly up and down in the valve core cage 121 to adjust the exposed area of ​​the flow regulating hole 1211 to control the flow.

[0067] like Figures 2 to 4 As shown, the end of the valve core plunger 122 facing away from the flow regulating hole 1211 is connected to the valve stem 124, and the end of the valve stem 124 away from the valve core plunger 122 is connected to the stepper driver assembly 11. The stepper driver assembly 11 can drive the valve stem 124 to move, thereby driving the valve stem 124 to move, and then driving the valve core plunger 122 to move linearly up and down along the inner hole of the valve core cage sleeve 121 through the valve stem 124.

[0068] like Figures 2 to 4 As shown, the valve body assembly 12 further includes a valve cover 125 , a valve stem joint 126 and a valve stem nut 127 .

[0069] like Figures 2 to 4 As shown, the upper end of the valve body 123 is connected to the valve cover 125 by bolts and is sealed by a metal sealing steel ring.

[0070] like Figures 2 to 4 As shown, the outside of the valve core cage 121 is connected to the bottom of the valve cover 125 through the valve core cage 121 protective cover and the valve stem 124 protective cover, and the flow regulating holes 1211 are evenly distributed on the valve core cage 121. The vertical inner hole of the valve core cage 121 is matched with the outer diameter of the valve core plunger 122 with a small gap. The valve stem 124 is driven by the stepping driver assembly 11 to drive the valve core plunger 122 to move up and down in the inner hole of the valve core cage 121 to adjust the exposed area of ​​the flow regulating hole 1211, thereby realizing precise flow regulation.

[0071] like Figures 2 to 4 As shown, the outer diameter of the valve core plunger 122 is matched with the small clearance of the vertical inner hole of the valve core cage 121. The upper end of the valve core plunger 122 is connected to the valve stem 124, and the valve stem 124 is driven by the stepping driver assembly 11 to drive the valve core plunger 122 to move linearly up and down in the inner hole of the valve core cage 121 to adjust the exposed area of ​​the flow regulating hole 1211 on the valve core cage 121, thereby realizing precise flow regulation.

[0072] like Figures 2 to 4 As shown, the upper end of the valve cover 125 is connected to the stepper drive assembly 11 through bolts and a sealing ring, providing a mounting and sealing position for the stepper drive assembly 11. The lower end of the valve cover 125 is sealed with the throttle valve body 123 through bolts and a metal sealing steel ring. The inner hole of the valve cover 125 is sealed with the valve stem 124 through the valve stem 124 seal.

[0073] like Figures 2 to 4As shown, the upper end of the valve stem 124 is connected to the lower part of the valve stem connector 126 by threading, and the lower end of the valve stem 124 is connected to the valve core plunger 122 by threading. The outer diameter sealing surface of the valve stem 124 is sealed with the valve cover 125 through the valve stem 124 to seal the internal working medium. The stepping driver assembly 11 of the underwater throttle valve assembly 1 is provided with pulse hydraulic pressure through the throttle valve hydraulic stepping drive and opening signal detection module 5, and the valve stem nut 127 is driven to rotate through the stepping driver assembly 11. The valve stem nut 127 and the valve stem connector 126 are matched through ACME threads, and the rotation of the valve stem nut 127 drives the valve stem connector 126 to move linearly in the up and down directions, and the valve stem 124 and the valve core plunger 122 installed at the lower end of the valve stem connector 126 move linearly in the up and down directions to adjust the exposed area of ​​the flow regulating hole 1211 of the valve core cage 121, thereby realizing flow regulation. The up and down linear motion is motion along the axial direction of the inner hole of the valve core cage 121 .

[0074] like Figures 2 to 4 As shown, the lower end of the valve stem connector 126 is connected and fixed to the valve stem 124 via threads, and the upper end is connected and driven to the valve stem nut 127 via threads, so as to convert the rotational motion of the valve stem nut 127 into the linear motion of the valve stem 124.

[0075] like Figures 2 to 4 As shown, the interior of the valve stem nut 127 cooperates with the ACME external thread on the upper part of the valve stem joint 126 through the ACME transmission thread, and the upper end of the valve stem nut 127 is connected to the stepper driver assembly 11 through a key, so that the stepper driver assembly 11 can be rotated to convert the transmission valve stem joint 126 into an up and down linear motion.

[0076] In one example, the detection component 4 also includes the high-pressure water pump 41, the low-pressure flowmeter 42, the thermometer 43, the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46. The high-pressure water pump 41, the thermometer 43, the low-pressure flowmeter 42, the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 are respectively connected to the CV test and CV value accuracy judgment calculation module 6, and the distance from the first pressure gauge 44 to the throttle valve inlet is the sum of the distance from the second pressure gauge 45 to the throttle valve inlet and the distance from the third pressure gauge 46 to the throttle valve outlet; the high-pressure water pump 41, the thermometer 43, the low-pressure flowmeter 42, the first pressure gauge 44 and the second pressure gauge 45 are arranged in the inlet test pipeline 2, the high-pressure water pump 41, the thermometer 43, the low-pressure flowmeter 42, the first pressure gauge 44, the second pressure gauge 45 are close to the throttle valve inlet in sequence, and the third pressure gauge 46 is arranged in the outlet test pipeline 3.

[0077] like Figures 2 to 4As shown, the throttle valve inlet is connected to an inlet test pipe 2, and a detection component 4 is arranged on the inlet test pipe 2. The detection component 4 is connected to a CV test and CV value accuracy judgment calculation module 6. The CV test and CV value accuracy judgment calculation module 6 collects information from the detection component 4 to ensure the accuracy of the throttle valve CV inspection pressure difference.

[0078] like Figures 2 to 4 As shown, the detection assembly 4 includes a high-pressure water pump 41 , a thermometer 43 , a low-pressure flow meter 42 , a first pressure gauge 44 , a second pressure gauge 45 and a third pressure gauge 46 .

[0079] like Figure 1 As shown, the distance from the first pressure gauge 44 to the second pressure gauge 45 is L1, the distance from the second pressure gauge 45 to the throttle valve inlet is L2, and the distance from the third pressure gauge 46 to the throttle valve outlet is L3. Pa is the pressure value collected at the L1 position, Pb is the pressure value collected at the L2 position by the second pressure gauge 45, and Pc is the pressure value collected at the L3 position by the third pressure gauge 46. The net pressure difference △P between the throttle valve inlet and the throttle valve outlet is (△P=2Pb-Pc-Pa).

[0080] like Figure 1 As shown, the positional relationship among the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 is L1=L2+L3. The special design aims to determine the total pressure difference △P2 of the pipeline sections L2 plus L3 of equal length by detecting the pressure difference △P1 (△P1=Pb-Pa) at both ends of the pipeline of length L1, that is, △P1=△P2, and obtain the net pressure difference △P (△P=2Pb-Pc-Pa) between the throttle valve inlet and the throttle valve outlet, thereby eliminating the influence of the pipeline pressure difference on the throttle valve CV test accuracy and ensuring the accuracy of the throttle valve CV detection pressure difference.

[0081] Among them, P1 is the pressure from the first pressure gauge 44 to the throttle valve inlet, that is, the pressure at a distance of L1 plus L2 from the throttle valve inlet flange, P2 is the pressure from the second pressure gauge 45 to the throttle valve inlet, that is, the pressure at a distance of L2 from the throttle valve inlet flange, P3 is the pressure from the throttle valve outlet to the third pressure gauge 46, that is, the pressure at a distance of L3 from the throttle valve outlet flange, Pa is the pressure value collected by the first pressure gauge 44 at the position L1 away from the second pressure gauge 45 on the left side of the inlet test pipe 2, Pb is the pressure value collected by the second pressure gauge 45 at a distance of L2 from the throttle valve inlet, and Pc is the pressure value collected by the third pressure gauge 46 at a distance of L3 from the throttle valve outlet.

[0082] like Figures 1 to 4As shown, the first pressure gauge 44 is a pressure sensor installed at the right side of the inlet test pipeline 2 at a distance L1 from the throttle valve inlet flange and the pressure interface to detect the pressure Pa at a distance L1 from the throttle valve outlet. The first pressure gauge 44 transmits the pressure sensor signal to the CV test and CV value accuracy judgment calculation module 6 via a cable.

[0083] like Figures 1 to 4 As shown, the second pressure gauge 45 is a pressure sensor installed at the right side of the inlet test pipeline 2 at a distance of L2 from the throttle valve inlet flange, and detects the pressure Pb at a distance of L2 from the throttle valve outlet. b. The pressure sensor signal is transmitted to the CV test and CV value accuracy judgment calculation module 6 via a cable.

[0084] like Figures 1 to 4 As shown, the third pressure gauge 46 is a pressure gauge interface installed on the outlet test pipe 3 to detect the pressure Pc at the distance L3 of the throttle valve outlet. The third pressure gauge 46 transmits the pressure sensor signal to the CV test and CV value accuracy judgment calculation module 6 through a cable.

[0085] like Figures 1 to 4 As shown, the thermometer 43 is installed in the temperature measuring hole of the inlet flange of the low-pressure flowmeter 42 to detect the temperature of the test medium and to determine the accurate sealing of the corresponding temperature small medium to avoid affecting the CV detection accuracy.

[0086] like Figure 1 As shown, the high-pressure water pump 41 is a pressure pump that supplies 14 MPa high pressure to the hydraulic system and is installed on the oil supply line. The input end of the high-pressure water pump 41 is connected to the oil tank 515 through a hydraulic pipeline, and the output end is connected to the hydraulic accumulator 511 through a hydraulic pipeline, and is used as a booster pump for the hydraulic system.

[0087] In the embodiment of the present application, a high-pressure water pump 41 plus a low-pressure flow meter 42 method is used to increase the test pressure and improve the low-flow detection accuracy. While ensuring the accurate flow value of the low flow, the pressure of the test loop is increased to obtain a high test pressure difference, ensure that the test loop medium is turbulent flow, and prevent the test pressure difference from being lower than the lower limit pressure difference of laminar flow, which affects the CV test accuracy.

[0088] Two pressure sensor interfaces are designed for the middle pipe of the inlet test pipe 2. The pressure sensor interface at the right end at a distance of L2 is installed with a second pressure gauge 45, which is used to detect the pressure at a distance of L2 from the throttle valve inlet. The pressure sensor interface at a distance of L1 from the second pressure gauge 45 is installed with a first pressure gauge 44, which is used to detect the pressure at a distance of L1 from the second pressure gauge 45. L1 is equal to the sum of L2 and the distance L3 from the upper end of the outlet test pipe 3 to the interface of the third pressure gauge 46 (L1 = L2 + L3). The purpose of this special design is to determine the total pressure difference △P2 of the L2 plus L3 sections of equal pipeline length by detecting the pressure difference △P1 (△P1 = Pb-Pa) at both ends of the L1 length pipeline, that is, △P1 = △P2, to obtain the net pressure difference △P (△P = 2Pb-Pc-Pa) between the throttle valve inlet and the throttle valve outlet, eliminate the influence of the pipeline pressure difference on the throttle valve CV test accuracy, and ensure the accuracy of the throttle valve CV detection pressure difference.

[0089] The above-mentioned L1 is the distance from the first pressure gauge 44 to the second pressure gauge 45, L2 is the distance from the second pressure gauge 45 to the throttle valve inlet, L3 is the distance from the throttle valve outlet to the third pressure gauge 46, P1 is the pressure from the first pressure gauge 44 to the throttle valve inlet, that is, the pressure at the distance L1 plus L2 from the throttle valve inlet flange, P2 is the pressure from the second pressure gauge 45 to the throttle valve inlet, that is, the pressure at the distance L2 from the throttle valve inlet flange, P3 is the pressure from the throttle valve outlet to the third pressure gauge 46, that is, the pressure at the distance L3 from the throttle valve outlet flange, Pa is the pressure value collected by the first pressure gauge 44 at the position L1 away from the second pressure gauge 45 on the left side of the inlet test pipe 2, Pb is the pressure value collected by the second pressure gauge 45 at a distance L2 from the throttle valve inlet, and Pc is the pressure value collected by the third pressure gauge 46 at a distance L3 from the throttle valve outlet.

[0090] A pressure sensor interface is designed at a distance L3 between the outlet of the outlet test pipe 3 and the front end for installing a third pressure gauge 46 .

[0091] In one example, the stepper drive assembly 11 includes an LVDT displacement sensor 1101 , and the LVDT displacement sensor 1101 is connected to the valve stem 124 .

[0092] like Figures 2 to 4 As shown, the LVDT displacement sensor 1101 includes an LVDT displacement sensor 1101 body and a moving core rod. The LVDT displacement sensor 1101 body is fixed inside the stepper driver assembly 11, and the moving core rod is connected and fixed to the side of the valve stem connector 126 through a corresponding mechanical structure, and then connected to the valve core plunger 122 through the valve stem 124.

[0093] The stepper driver assembly 11 drives the valve core plunger 122 to move linearly up and down, and drives the moving core rod of the LVDT displacement sensor 1101 to move inside the LVDT displacement sensor 1101 body to generate a 4-20ma (corresponding to 0%-100% opening) opening current signal, which is used to accurately detect the displacement of the valve core plunger 122. At the same time, during the CV test process, the 4-20ma (corresponding to 0%-100% opening) opening current signal collected by the LVDT displacement sensor 1101 is transmitted to the throttle valve hydraulic stepper drive and opening signal detection module 5 for collection, and the CV value detected under the corresponding opening is detected and calculated by the CV test and CV value accuracy judgment calculation module 6, and finally the corresponding opening and CV value are transmitted to the underwater throttle valve CV flow characteristic test system 7 for CV characteristic curve drawing to obtain the accurate CV characteristic curve of the throttle valve.

[0094] The stepper driver assembly 11 includes an electric throttle wet plug connector 1112. The connector is an underwater wet plug electrical connector, and the upper end of the electric throttle wet plug connector 1112 is connected and sealed to the bottom of the stepper driver assembly 11 through bolts and O-rings. The tail core cable of the electric throttle wet plug connector 1112 is connected to the opening signal core cable of the LVDT displacement sensor 1101, which is used to transmit the opening signal of the LVDT displacement sensor 1101 to the outside of the underwater throttle valve driver assembly.

[0095] The method for transmitting the current signal of the LVDT displacement sensor 1101 to the throttle valve hydraulic stepping drive and opening signal detection module 5 is to connect the cable of the LVDT displacement sensor 1101 to the electric traverser wet plug connector 1112, pass through the electric traverser wet plug connector 1112 to the outside of the stepping driver assembly 11, and then connect to the throttle valve hydraulic stepping drive and opening signal detection module 5 through the cable.

[0096] In one example, the throttle valve hydraulic stepping drive and opening signal detection module 5 includes an opening communication module 501, an opening signal acquisition module 502, a driver pressure acquisition module 503, an HPU pulse hydraulic system 504, a solenoid valve control module 505, an open circuit output pressure sensor 506, a closed circuit output pressure sensor 507, an open circuit two-position three-way solenoid valve 508, and a closed circuit two-position three-way solenoid valve 509; wherein the opening signal acquisition module 502 is connected to the LVDT displacement sensor 1101, the driver pressure acquisition module 503 is connected to the open circuit output pressure sensor 506 and the closed circuit output pressure sensor 507 respectively, the HPU pulse hydraulic system 504 is connected to the opening signal acquisition module 502 and the driver pressure acquisition module 503 respectively, the HPU pulse hydraulic system 504 is connected to the solenoid valve control module 505, and the solenoid valve control module 505 controls the open circuit two-position three-way solenoid valve 508 and the closed circuit two-position three-way solenoid valve 509.

[0097] like Figure 1 and Figure 5 As shown, the opening communication module 501 transmits the opening signal of the throttle valve to the underwater throttle valve CV flow characteristic test system 7 to form the opening axis data of the CV characteristic curve.

[0098] like Figure 1 and Figure 5 As shown, the opening signal acquisition module 502 is connected to the LVDT displacement sensor 1101 through a signal cable, provides a 24V DC power supply to the LVDT displacement sensor 1101, and acquires the accurate throttle valve opening value fed back by the LVDT displacement sensor 1101. The opening signal acquisition module 502 transmits the opening signal to the HPU pulse hydraulic system 504, combines the current signal fed back by the LVDT displacement sensor 1101, and collects the hydraulic signals of the open-circuit output pressure sensor 506 and the closed-circuit output pressure sensor 507 in combination with the HPU pulse hydraulic system 504, and programs the throttle valve driver pulse hydraulic control program.

[0099] One-step stepper driver logic (taking throttle valve opening as an example): HPU pulse hydraulic system 504 provides a pressure command signal to solenoid valve control module 505, solenoid valve control module 505 controls the open circuit two-position three-way solenoid valve 508 to provide the open circuit cylinder of double-hole cylinder 1107 with rated working hydraulic pressure to drive the throttle valve to open one step, and the opening cylinder pressure is collected by open circuit output pressure sensor 506 and transmitted to driver pressure collection module 503, and then the pressure signal is processed and transmitted to HPU pulse hydraulic system 504, and the pressure is maintained for one second, and then HPU pulse hydraulic system 504 controls the open circuit solenoid valve control module 505 to release the pressure to the open circuit two-position three-way solenoid valve 508 to zero, and the pressure signal collected by the open circuit output pressure sensor 506 is transmitted to HPU pulse hydraulic system 504 again, and maintained for three seconds to complete one-step hydraulic drive. Then, according to the number of steps required for the underwater throttle valve assembly 1 to open and close, the HPU pulse hydraulic system 504 is set with the number of steps required for the throttle valve to open and close, thereby realizing automatic hydraulic stepping drive and opening signal collection of the underwater throttle valve assembly 1.

[0100] like Figure 1 and Figure 5 As shown, the input end of the driver pressure acquisition module 503 has two signal cables, one of which is connected to the open-circuit output pressure sensor 506, and the other is connected to the closed-circuit output pressure sensor 507, which is used to collect the pressure electrical signal of the pressure sensor. The driver pressure acquisition module 503 has a pressure electrical signal processing module inside to convert the collected pressure current signal into a pressure signal. The output end of the driver pressure acquisition module 503 has a cable to transmit the processed collected pressure signal to the HPU pulse hydraulic system 504, which is used for the HPU pulse hydraulic system 504 to determine the pressure of the double-hole cylinder 1107 for compression and decompression;

[0101] like Figure 1 and Figure 5 As shown, the HPU pulse hydraulic system 504 is a pulse hydraulic control system with a throttle valve driver step drive control program and a human-machine setting operation panel, and the throttle valve drive step number can be manually set.

[0102] The HPU pulse hydraulic system 504 provides a signal to the solenoid valve control module 505 through a step control program to control the open circuit two-position three-way solenoid valve 508 and the closed circuit two-position three-way solenoid valve 509 to supply pressure or release pressure, thereby realizing the step switch drive of the test sample underwater throttle valve assembly 1.

[0103] The HPU pulse hydraulic system 504 processes the pressure signals of the open-circuit output pressure sensor 506 and the closed-circuit output pressure sensor 507 transmitted by the driver pressure acquisition module 503, and uses the internally set stepper driver as the excitation signal for the pressure and pressure relief commands of the open-circuit oil cylinder and the closed-circuit oil cylinder. Take the open circuit as an example: the double-hole oil cylinder 1107 is pressurized to the rated pressure, and the open-circuit output pressure sensor 506 transmits the rated pressure signal to the processing driver pressure acquisition module 503 for processing, and transmits it to the HPU pulse hydraulic system 504 to excite the pressure relief command, and then the HPU pulse hydraulic system 504 sends the pressure relief command to the solenoid valve control module 505 to control the two-position three-way solenoid valve to relieve pressure. After the double-hole oil cylinder 1107 is depressurized to zero, the pressure sensor transmits the pressure signal to the pressure acquisition module again, and transmits it to the HPU pulse hydraulic system 504, and keeps it for three seconds to determine that one-step driving is completed. Then, according to the number of steps required for the throttle valve to open and close, the number of steps required for the throttle valve to open and close is set for the HPU pulse hydraulic system 504, so that the automatic hydraulic stepping drive of the throttle valve and the acquisition of the opening signal can be realized.

[0104] The HPU pulse hydraulic system 504 processes the throttle valve opening signal transmitted by the opening signal acquisition module 502 and transmits it to the opening communication module 501 .

[0105] like Figure 1 and Figure 5 As shown, the input end of the solenoid valve control module 505 is connected to the HPU pulse hydraulic system 504 through a cable; the two outputs of the solenoid valve control module 505 are connected to the open circuit two-position three-way solenoid valve 508 and the closed circuit two-position three-way solenoid valve 509 through cables; the solenoid valve control module 505 controls the open circuit two-position three-way solenoid valve 508 and the closed circuit two-position three-way solenoid valve 509 to supply or release pressure through a pulse control program, thereby providing a pulse hydraulic drive to open or close the underwater throttle valve assembly 1 of the test sample;

[0106] like Figure 1 and Figure 5 As shown, the open-circuit output pressure sensor 506 is installed on the open-circuit pressure output pipeline to collect the pressure of the open-circuit pipeline. The open-circuit output pressure sensor 506 is connected to the driver pressure collection module 503 through a cable.

[0107] like Figure 1 and Figure 5 As shown, the closure output pressure sensor 507 is installed on the closure pressure output pipeline to collect the pressure of the closure pipeline. The closure output pressure sensor 507 is connected to the driver pressure collection module 503 through a cable.

[0108] like Figure 1 and Figure 5As shown, the open circuit two-position three-way solenoid valve 508 is installed on the open circuit pressure output pipeline to control the pressure supply and pressure relief of the open circuit oil cylinder. The open circuit two-position three-way solenoid valve 508 is connected to the solenoid valve control module 505 through a cable, and the solenoid valve control module 505 provides a control model to perform pressure supply or pressure relief.

[0109] like Figure 1 and Figure 5 As shown, the two-position three-way solenoid valve 509 of the closing circuit is installed on the closing circuit pressure output pipeline, and is used to control the pressure supply and pressure relief of the closing circuit oil cylinder. The two-position three-way solenoid valve 509 of the closing circuit is connected to the solenoid valve control module 505 through a cable, and the solenoid valve control module 505 provides a control model to execute pressure supply or pressure relief.

[0110] like Figure 1 and Figure 5 As shown, the hydraulic system pressure gauge 510 is installed on the main hydraulic system circuit and is used to detect the total pressure of the hydraulic system during field testing.

[0111] like Figure 1 and Figure 5 As shown, the hydraulic accumulator 511 is installed on the oil supply line to store energy, store hydraulic energy and stabilize the output pressure.

[0112] like Figure 1 and Figure 5 As shown, the second hydraulic filter 512 filters the impurity particles in the hydraulic oil to ensure the cleanliness of the hydraulic oil and increase the service life of the cylinder seal.

[0113] like Figure 1 and Figure 5 As shown, the first hydraulic filter 513 is used to filter impurities and particles in the hydraulic oil to ensure the cleanliness of the hydraulic oil, reduce the wear of the cylinder seal and increase the service life of the cylinder seal;

[0114] like Figure 1 and Figure 5 As shown, the circulating hydraulic pump 514 is a circulating and filtering hydraulic pump for the hydraulic oil in the oil tank 515, and is used to provide power for the clean hydraulic oil.

[0115] like Figure 1 and Figure 5 As shown, the oil tank 515 is used to store hydraulic fluid for the hydraulic system.

[0116] like Figure 1 and Figure 5 As shown, the hydraulic pump 516 is a hydraulic system pressure supply pump, the hydraulic pump 516 is installed on the oil supply line, the input section of the hydraulic pump 516 is connected to the oil tank 515 through a hydraulic pipeline, and the output section of the hydraulic pump 516 is connected to the hydraulic accumulator 511 through a hydraulic pipeline for the hydraulic system pressure gauge 510;

[0117] The throttle valve hydraulic stepping drive and opening signal detection module 5 controls the open circuit two-position three-way solenoid valve 508 and the closed circuit two-position three-way solenoid valve 509 through the HPU pulse hydraulic system 504 to provide pulse hydraulic pressure to the open circuit or closed circuit cylinder of the double-hole oil cylinder 1107, which is used to drive the test sample underwater throttle valve assembly 1 from open to closed or closed to open, and realize the throttle valve hydraulic stepping drive. The opening model acquisition module inside the underwater throttle valve assembly 1 hydraulic stepping drive and opening signal detection module 5 is used to collect the accurate opening electrical signal 4-20ma of the underwater throttle valve assembly 1, and convert the accurate opening of the underwater throttle valve assembly 1 0%...100% through the corresponding logical relationship between current and opening.

[0118] In one example, the CV test and CV value accuracy judgment calculation module 6 includes a CV communication module 61, a CV calculation and CV value accuracy judgment calculation module 62, a pressure signal acquisition module 63, and a flow control and acquisition module 64; wherein the pressure signal acquisition module 63 and the flow control and acquisition module 64 are respectively connected to the CV calculation and CV value accuracy judgment calculation module 62, the thermometer 43, the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 are respectively connected to the pressure signal acquisition module 63, and the high-pressure water pump 41 and the low-pressure flowmeter 42 are respectively connected to the flow control and acquisition module 64.

[0119] like Figure 1 and Figure 6 As shown, the CV test and CV value accuracy judgment calculation module 6 includes a CV communication module 61, a CV calculation and CV value accuracy judgment calculation module 62, a pressure signal acquisition module 63, a flow control and acquisition module 64, etc.

[0120] The CV communication module 61 transmits the CV value calculated by the CV calculation and CV value accuracy judgment calculation module 62 to the underwater throttle valve CV flow characteristic testing system 7 .

[0121] The flow signal input interface of the CV calculation and CV value accuracy judgment calculation module 62 is connected to the flow control and acquisition module 64 and is used to input the pipeline flow value collected by the flow control and acquisition module 64 .

[0122] The throttle valve pressure difference input interface of the CV calculation and CV value accuracy judgment calculation module 62 is connected to the pressure signal acquisition module 63, and the pressure difference ΔP between the throttle valve inlet and the throttle valve outlet of the test sample collected by the pressure signal acquisition module 63 is input.

[0123] CV calculation and CV value accuracy judgment calculation module 62 has a CV calculation module inside, according to the test flow value Q transmitted by the flow control and acquisition module 64 and the net pressure difference △P transmitted by the pressure signal acquisition module 63, the CV calculation formula is used Programming, automatically counting the corresponding CV value.

[0124] Wherein, CV is the number of gallons of liquid flowing through a specified hole size at a pressure difference of 1 psi, Qc is the production, ΔPc is the pressure difference between the throttle valve inlet and the throttle valve outlet, and Gfc is a parameter of the oil and gas well medium density.

[0125] CV calculation and CV value accuracy judgment calculation module 62 with CV value accuracy judgment counting module, through the test counted CV value, combined with flow Q, medium kinematic viscosity υ, pipe diameter D, throttle valve flow recovery coefficient FL, throttle valve correction coefficient Fd, programming counting Reynolds coefficient is determined by Rev Reynolds coefficient. If it is greater than or equal to 10000, it is turbulent flow and the test result is accurate. If it is less than 10000, it is laminar flow and the test result is inaccurate and screened out. The medium flow type is determined by the Reynolds coefficient to achieve the first judgment on the accuracy of the CV test.

[0126] Among them, F d is the throttle correction factor, F L is the throttle valve flow recovery coefficient, CV is the CV value tested at this opening, Q is the medium flow through the underwater throttle valve at this opening; υ is the kinematic viscosity of the medium at the inlet temperature, and D is the inlet pipe diameter.

[0127] CV calculation and CV value accuracy judgment The internal program of the calculation module 62 is based on the collected net pressure difference △P before and after the throttle valve test is less than The second judgment is made by comparing the critical blocking pressure difference with the critical blocking pressure difference to finally obtain the accurate CV test value, and the inaccurate CV result caused by the pressure difference greater than the blocking pressure difference is screened out.

[0128] Among them, F LP is the throttle valve flow recovery coefficient, F P is the pipeline geometry correction factor, P b is the throttle valve inlet pressure value, P V is the absolute vapor pressure of the medium at the inlet temperature, F F Liquid critical compression ratio coefficient, Pc is the absolute thermodynamic critical pressure.

[0129] The input end of the pressure signal acquisition module 63 is connected to the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 through three cables, and a cable is connected to the thermometer 43, the thermometer 43 is a temperature sensor T, which is used to collect the test medium temperature and the net pressure difference between the throttle inlet and the throttle outlet. The output end of the pressure signal acquisition module 63 transmits the pressure data of the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 and the temperature data of the temperature sensor T to the CV calculation and CV value accuracy judgment calculation module 62 through cables, which is used for the CV calculation and CV value accuracy judgment calculation module 62 counting data input.

[0130] The actual temperature of the medium is detected by the temperature sensor, the corresponding density Gf and viscosity at different temperatures are determined, the corresponding CV value is accurately calculated, and the influence of temperature changes on the CV test results is resolved.

[0131] The flow control and acquisition module 64 is connected to the CV test high-pressure water pump 41 through a cable, and is used to control the speed of the CV test high-pressure water pump 41 to achieve medium flow control in the test pipeline. The input end of the flow control and acquisition module 64 is connected to the low-pressure flow meter 42 through a signal cable, and is used to collect the precise flow Q of the medium inside the pipeline. The output end of the flow control and acquisition module 64 transmits the collected throttle valve flow Q to the CV calculation and CV value accuracy judgment calculation module 62 through a cable, and is used for the CV calculation and CV value accuracy judgment calculation module 62 to count Q flow data input.

[0132] In one example, the CV test and CV value accuracy judgment calculation module 6 can judge the upper limit pressure difference and the lower limit pressure difference; the method for the CV test and CV value accuracy judgment calculation module 6 to judge the upper limit pressure difference includes: determining the upper limit blocking pressure difference value and the calculation formula Through actual test, the pressure difference △P is less than △P choke The blocking pressure difference is compared to limit the accuracy of the CV test value. The test pressure difference value higher than the blocking pressure difference is screened out through system programming to ensure that the pressure difference value input for the test CV value calculation is less than the blocking pressure difference, thereby ensuring the accuracy of the test CV. LP is the throttle valve flow recovery coefficient, the F P is the pipeline geometry correction factor, the P b is the throttle valve inlet pressure value, the P V is the absolute vapor pressure of the medium at the inlet temperature, the F F Liquid critical compression ratio coefficient, The Pc is the absolute thermodynamic critical pressure; the method for the CV test and CV value accuracy judgment calculation module 6 to judge the lower limit pressure difference includes: Reynolds coefficient, the lower limit pressure difference of the CV test process is judged by the flow Reynolds coefficient value greater than 10000. When the pressure difference is less than the lower limit pressure difference, the medium flow Reynolds coefficient is less than 10000, and the flow channel medium flow is laminar flow. When the pressure difference is greater than the lower limit pressure difference, the medium flow Reynolds coefficient is greater than 10000, and the flow channel medium flow is turbulent. Through system program programming, the test pressure difference of the medium flow Reynolds coefficient less than 10000 in the test process is screened out, and the test pressure difference of the flow channel medium flow is laminar flow, ensuring that the pressure difference calculated by the CV test is greater than the test pressure of the flow channel medium flow Reynolds coefficient greater than 10000, and the flow channel medium flow is turbulent, ensuring high CV test accuracy, wherein, the F d is the throttle correction factor, the F L is the throttle valve flow recovery coefficient, the CV is the CV value tested at this opening, the Q is the medium flow through the underwater throttle valve at this opening; υ is the kinematic viscosity of the medium at the inlet temperature, and D is the inlet pipe diameter; the CV value and the corresponding opening between the upper and lower pressure differences are obtained, the underwater throttle valve CV flow characteristic test system 7 is programmed to draw the CV and the opening % curve of the underwater throttle valve, and output the underwater throttle valve CV flow characteristic curve.

[0133] like Figure 1 and Figure 6 As shown, the underwater throttle valve CV flow characteristic test system 7 includes a CV test and CV value accuracy judgment calculation module 6. The CV test and CV value accuracy judgment calculation module 6 is connected to the CV input end and is used to collect the accurate CV value of the test sample underwater throttle valve assembly 1.

[0134] The underwater throttle valve CV flow characteristic test system 7 includes a throttle valve hydraulic stepping drive and opening signal detection module 5. The throttle valve hydraulic stepping drive and opening signal detection module 5 is connected to the opening input end, and is used to collect the precise opening and corresponding number of steps of the test sample underwater throttle valve assembly 1, realize programming and drawing the CV and throttle valve opening % curve, and output the accurate CV characteristic curve of the test sample underwater throttle valve assembly 1.

[0135] The underwater throttle valve CV flow characteristic testing system 7 also includes a first valve 71 , a curved pipe 72 , a second valve 73 and a pipeline 74 .

[0136] like Figure 1As shown, the left inlet of the CV test high-pressure water pump 41 is connected to the water tank assembly 8 through a flange. The right outlet of the CV test high-pressure water pump 41 is connected to the first valve 71. The CV test high-pressure water pump 41 is provided with power supply of the CV test high-pressure water pump 41 through a cable and the flow control and acquisition module 64. The function of the CV test high-pressure water pump 41 is to pump the test medium water of the water tank assembly 8 into the test circulation pipeline, provide the flow Q of the throttle valve CV test and the high pressure of the medium at the throttle valve inlet, ensure that the test medium flows in turbulent flow, and ensure the accuracy of the CV test.

[0137] like Figure 1 As shown, the left inlet of the first valve 71 is connected to the CV test high-pressure water pump 41 through a flange. The outlet of the first valve 71 is connected to the low-pressure flowmeter 42 through a flange. During the test process, the first valve 71 is in a fully open state to ensure the flow of the test medium, and is closed when not testing to prevent the loss of the medium in the water tank assembly 8.

[0138] like Figure 1 As shown, the left end cable of the 1m3 / h low-pressure flow meter 42 is flange-connected to the first valve 71, and the right flange of the low-pressure flow meter 42 is flange-connected to the inlet test pipe 2 for detecting the flow through the throttle valve.

[0139] like Figure 1 As shown, the upper side of the elbow 72 is flange-connected to the outlet test pipe 3 .

[0140] like Figure 1 As shown, the left inlet of the second valve 73 is connected to the pipeline through a flange. The right side of the second valve 73 is connected to the elbow 72 through a flange. During the test process, the second valve 73 is in a fully open state to ensure the flow of the test medium, and is closed when not testing.

[0141] like Figure 1 As shown, the right side of the pipeline 74 is flange-connected to the second valve 73 , and the left side of the pipeline 74 is connected to the water filtration system 9 assembly.

[0142] like Figure 1 As shown, the right side of the drain valve 75 is installed at the drain port of the water tank assembly 8, and is used to drain the water in the water tank assembly 8 after the test is completed;

[0143] like Figure 1 As shown, the lower right outlet of the water tank assembly 8 is connected to the CV test high-pressure water pump 41 through a flange, and serves as a test medium pool to store the test medium. The lower left side of the drain valve 75 is connected to the drain valve 75 through a flange for draining water. The water filter system 9 assembly is installed on the upper part of the drain valve 75 to filter the circulating water.

[0144] like Figure 1As shown, the water filtration system 9 assembly is installed on the top of the water tank assembly 8. The water filtration system 9 assembly has a water flow device inside, which is used to filter impurities and sediment in the test medium, ensure the cleanliness of the test medium, prevent impurity blockage from affecting the accuracy of the CV test, and achieve accurate CV testing.

[0145] In the embodiment of the present application, the CV test and the CV value accuracy judgment calculation module 6CV test working principle description:

[0146] The throttle valve CV calculation formula is shown in (Formula 1). According to the medium flow Q passing through the throttle valve detected by the low-pressure flow meter 42 collected by the flow control and acquisition module, the pressure signal acquisition module 63 detects the net pressure difference △P, and the test medium density Gf under room temperature regulation, and then program according to the following CV calculation formula 1 to automatically calculate the CV value at the corresponding opening.

[0147]

[0148] △P=2Pb-Pc-Pa…………………………………………(Formula 2)

[0149] Where Pa is the pressure value collected by the first pressure gauge 44 at the position L1 away from the second pressure gauge 45 on the left side of the inlet test pipe 2. Pb is the pressure value collected by the second pressure gauge 45 at a distance of L2 from the throttle valve inlet. Pc is the pressure value collected by the third pressure gauge 46 at a distance of L3 from the throttle valve outlet.

[0150] The positional relationship among the first pressure gauge 44, the second pressure gauge 45 and the third pressure gauge 46 is L1=L2+L3. The special design purpose is to determine the total pressure difference △P2 of the pipeline sections L2 plus L3 of equal length by detecting the pressure difference △P1 (△P1=Pb-Pa) at both ends of the L1 length pipeline, that is, △P1=△P2, to obtain the net pressure difference △P (△P=2Pb-Pc-Pa) between the inlet and outlet of the throttle valve, thereby eliminating the influence of the pipeline pressure difference on the throttle valve CV test accuracy and ensuring the accuracy of the throttle valve CV detection pressure difference.

[0151] Wherein L1 is the distance from the first pressure gauge 44 to the second pressure gauge 45 , L2 is the distance from the second pressure gauge 45 to the throttle valve inlet, and L3 is the distance from the throttle valve outlet to the third pressure gauge 46 .

[0152] CV test and CV value accuracy judgment calculation module 6CV test result accuracy judgment measure principle description and test method:

[0153] The present application proposes a first accuracy judgment method and calculation formula for CV values ​​and a second accuracy judgment method and calculation formula, which screen out the two factors that affect the accuracy of CV test values, high pressure difference and low pressure difference, and determine an upper limit pressure difference and a lower limit pressure difference range that meet the accuracy of CV test.

[0154] The first CV value accuracy judgment method and calculation formula is the upper limit pressure difference judgment method, determining the upper limit blocking pressure difference value and calculation formula △P choke See formula 3. Through actual test, the pressure difference △P is less than △P choke The blocking pressure difference comparison limits the accuracy of the CV test value. The test pressure difference values ​​higher than the blocking pressure difference are screened out through system programming to ensure that the pressure difference value input for the test CV value calculation is less than the blocking pressure difference, thereby ensuring the accuracy of the test CV.

[0155] The blocking pressure difference is defined as the pressure difference at which the flow rate remains unchanged as the pressure difference increases under the same opening. When the pressure difference is less than the blocking pressure difference, the flow rate increases as the pressure difference increases. When the pressure difference is greater than this critical blocking pressure difference, the flow rate remains unchanged as the pressure difference increases. The upper limit pressure difference of the test is determined by the blocking pressure difference, which is the first judgment method for realizing the accuracy of the CV value.

[0156]

[0157] Among them: F LP is the throttle valve flow recovery coefficient. The underwater throttle valve is a single-stage cage throttle valve F LP Take 0.85 Take 0.85;

[0158] F P is the pipeline geometry correction factor, F P Take 1;

[0159] P b is the throttle valve inlet pressure value;

[0160] P V is the absolute vapor pressure of the medium at the inlet temperature (T);

[0161] F F Liquid critical compression ratio coefficient, Pc is the absolute thermodynamic critical pressure.

[0162] The second CV value accuracy judgment method and calculation formula is the lower limit pressure difference judgment method. The Rev Reynolds coefficient is counted by programming, see formula 4, and the lower limit pressure difference of the CV test process is judged by the flow Reynolds coefficient value greater than 10000. When the pressure difference is less than the lower limit pressure difference, the medium flow Reynolds coefficient is less than 10000, and the flow channel medium flow is laminar. When the pressure difference is greater than the lower limit pressure difference, the medium flow Reynolds coefficient is greater than 10000, and the flow channel medium flow is turbulent. Through system program programming, the test pressure difference in which the medium flow Reynolds coefficient is less than 10000 during the test process is screened out, and the flow channel medium flow is laminar. Ensure that the pressure difference calculated by the CV test is greater than the test pressure of the flow channel medium flow with a Reynolds coefficient greater than 10000, and the flow channel medium flow is turbulent, to ensure high CV test accuracy.

[0163]

[0164] in:

[0165] F d is the throttle correction factor. The underwater throttle valve is a single-stage cage throttle valve F LP Take 0.41Take 0.41;

[0166] F L is the throttle valve flow recovery coefficient. The underwater throttle valve is a single-stage cage throttle valve F LP Take 0.85 Take 0.85;

[0167] CV is the CV value tested at this opening;

[0168] Q is the medium flow rate through the underwater throttle valve at this opening;

[0169] υ is the kinematic viscosity of the medium at the inlet temperature;

[0170] D Inlet pipe diameter.

[0171] Working principle of underwater throttle valve hydraulic stepping drive: The throttle valve hydraulic stepping drive and opening signal detection module 5 includes an opening communication module 501, an opening model acquisition module, a driver pressure acquisition module 503, an HPU pulse hydraulic system 504, a solenoid valve control module 505, an open circuit output pressure sensor 506, a closed circuit output pressure sensor 507, an open circuit two-position three-way solenoid valve 508, a closed circuit two-position three-way solenoid valve 509, a hydraulic system pressure, a high-pressure water pump 41, a hydraulic accumulator 511, a second hydraulic filter 512, a first hydraulic filter 513, a circulating hydraulic pump 514, and an oil tank 515.

[0172] The open two-position three-way solenoid valve 508 and the closed two-position three-way solenoid valve 509 are controlled by the HPU pulse hydraulic system 504 to provide pulse hydraulic pressure to the open or closed cylinder of the double-hole cylinder 1107, so as to drive the test sample underwater throttle valve assembly 1 from open to closed or from closed to open, thereby realizing hydraulic stepping drive of the throttle valve.

[0173] Through the system programming of the throttle valve hydraulic stepping drive and the opening signal detection module 5, the underwater throttle valve stepping drive logic program is determined. One-step stepping drive program logic (taking the throttle valve opening stepping drive as an example): the HPU pulse hydraulic system 504 provides a pressure command signal to the solenoid valve control module 505, and the solenoid valve control module 505 controls the open circuit two-position three-way solenoid valve 508 to provide the open circuit oil cylinder of the double-hole oil cylinder 1107 with the rated working hydraulic pressure to drive the throttle valve to open one step, and the opening oil cylinder pressure is collected by the open circuit output pressure sensor 506 and transmitted to the driver pressure collection module 503, and then the pressure signal is processed and transmitted to the HPU pulse hydraulic system 504, and the pressure is maintained for one second, and then the HPU pulse hydraulic system 504 controls the open circuit solenoid valve control module 505 to release the pressure to the open circuit two-position three-way solenoid valve 508 to zero, and the pressure signal collected by the open circuit output pressure sensor 506 is transmitted to the HPU pulse hydraulic system 504 again, and maintained for three seconds to complete one-step hydraulic drive. Then, according to the number of steps required for the throttle valve to open and close, the number of steps required for the throttle valve to open and close is set for the HPU pulse hydraulic system 504, so that the automatic hydraulic stepping drive of the throttle valve can be realized.

[0174] Working principle of throttle valve opening signal acquisition module 502: The LVDT displacement sensor 1101 inside the test sample underwater throttle valve assembly 1 includes the LVDT displacement sensor 1101 body and the moving core rod. The LVDT displacement sensor 1101 body is fixed inside the stepper driver assembly 11, and the moving core rod is connected and fixed to the side of the valve stem joint 126 through the corresponding mechanical structure, and then connected to the valve core plunger 122 through the valve stem 124. During the process of the stepper driver assembly 11 driving the valve core plunger 122 to move up and down, the moving core rod of the LVDT displacement sensor 1101 is driven to move inside the LVDT displacement sensor 1101 body to generate a 4-20ma corresponding to 0%-100% opening current signal, and the LVDT displacement sensor 1101 is used to accurately detect the displacement and opening of the valve core plunger 122.

[0175] The opening model acquisition module is connected to the LVDT displacement sensor 1101 through a signal cable, provides a 24V DC power supply to the LVDT displacement sensor 1101, collects the accurate throttle valve opening 4-20ma current signal value fed back by the LVDT displacement sensor 1101, and converts it into a corresponding 0%-100% opening signal through programming to realize accurate detection of the throttle valve opening.

[0176] According to another embodiment of the present application, a flow regulation method is provided, which includes the underwater throttle valve CV flow characteristic testing system as described above.

[0177] The above test method can achieve precise flow regulation during engineering production.

[0178] In one example, the flow rate regulation method includes: Step 1: According to the oil and gas well production parameters, according to The flow characteristic calculation formula calculates the CV value corresponding to the production regulation demand of the oil and gas well, wherein the CV is the number of gallons of liquid flowing through a specified hole size under a pressure difference of 1 psi, the Qc is the production, the ΔPc is the pressure difference between the throttle valve inlet and the throttle valve outlet, and the Gfc is a parameter of the oil and gas well medium density; Step 2: Combined with the CV flow characteristic curve of the underwater throttle valve, determine the adjustment opening and throttle valve step corresponding to the CV value of the underwater throttle valve.

[0179] In the embodiment of the present application, the CV value represents the flow capacity of the element for the liquid, that is, the flow coefficient. The underwater throttle valve CV flow characteristic curve is the throttle valve CV and valve core opening curve, which is used to accurately adjust the throttle valve opening corresponding to the required production parameters in the oil and gas production process, so as to achieve accurate adjustment and control of the production in the oil and gas production process. The accuracy of the underwater throttle valve CV characteristic curve test mainly includes two key factors: CV test accuracy and opening test accuracy.

[0180] In the embodiment of the present application, a high-pressure, low-flow CV detection system and a throttle valve opening hydraulic stepping drive and an opening signal precise detection system are modularly designed to achieve precise CV testing of high-pressure, low-throttle valve apertures at various openings, and to simulate the actual working conditions of an underwater throttle valve using an integrated underwater throttle hydraulic stepping drive and opening signal precise detection system, to perform hydraulic stepping drive on the tested throttle valve and to accurately detect the corresponding steps and opening electrical signals of 4-20ma (corresponding to an opening of 0-100%).

[0181] On this basis, a method for judging the accuracy of double CV test values ​​is proposed:

[0182] The first test CV value judgment method is to compare and judge the test pressure difference with the blocking pressure difference, that is, the critical pressure difference at which the flow rate increases with the increase of the pressure difference, to ensure that the test pressure difference is less than the blocking pressure difference, and solve the problem that the test pressure difference is greater than the blocking pressure difference, resulting in inaccurate CV test results;

[0183] The second test CV value accuracy judgment method is to use the Reynolds coefficient judgment method to determine the test fluid flow type, ensure that the test fluid flow type is turbulent, and avoid small flow rate flow causing laminar flow in the pipeline and affecting the accuracy of the CV test results.

[0184] Finally, through accurate detection of the high-pressure and low-flow CV of the throttle valve in the underwater oil and gas extraction industry, as well as precise control and detection of the opening of the underwater throttle valve, combined with the double test accuracy judgment method of blocking pressure difference and Reynolds coefficient, accurate detection of the CV characteristic curve of the underwater throttle valve is achieved.

[0185] The CV characteristic curve of underwater throttle valve CV flow characteristic curve is tested by accurate test device and test method. Figure 7 As shown, the vertical axis is the CV value axis, and the horizontal axis is the throttle valve opening axis. The CV value of the throttle valve at the corresponding opening is accurately tested by the CV test and CV value accuracy judgment calculation module 6, and the CV value is transmitted to the underwater throttle valve CV flow characteristic test system 7 as the CV value of the vertical axis. The throttle valve hydraulic stepping drive and opening signal detection module 5 accurately controls the throttle valve opening adjustment and the corresponding opening signal detection as well as the corresponding throttle valve step detection, and transmits them to the underwater throttle valve CV flow characteristic test system 7 as the opening value of the horizontal axis, thereby realizing automatic detection of the CV characteristic curve.

[0186] The CV flow characteristic curve is the inherent characteristic curve of the throttle valve. The CV flow characteristic curve of the underwater throttle valve guides the engineering production process to adjust the production parameters in accordance with the demand. The method to determine the corresponding adjustment opening of the throttle valve is as follows:

[0187] First, according to the oil and gas well production parameters, including production Qc, throttle inlet and outlet pressure difference △Pc, oil and gas well medium density Gfc and other parameters, according to The flow characteristic calculation formula calculates the CV value of the oil and gas well corresponding to the production adjustment demand during the engineering production process, and then combines the CV flow characteristic curve of the underwater throttle valve tested by the invention patent as shown in Figure 6 As shown, the adjustment opening and throttle valve step corresponding to the CV value of the underwater throttle valve are determined, so that the corresponding opening of the throttle valve corresponding to the production adjustment demand in the engineering production process can be guided to achieve precise production adjustment.

[0188] The underwater throttle valve CV flow characteristic curve of the present application is applied to the method of accurately adjusting the output in the production process of oil and gas field engineering to achieve accurate control of output.

[0189] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An underwater throttle valve CV flow characteristic curve testing system, characterized in that: include: An underwater throttle valve assembly (1) comprises a stepping drive assembly (11) and a valve body assembly (12), wherein the valve body assembly (12) comprises a throttle valve inlet and a throttle valve outlet, wherein the throttle valve inlet is connected to an inlet test pipe (2), and the throttle valve outlet is connected to an outlet test pipe (3), and detection components (4) are arranged on the inlet test pipe (2) and the outlet test pipe (3). Wherein, a valve core cage (121) and a valve core plunger (122) are arranged in the valve body assembly (12); the valve core plunger (122) is arranged in the valve core cage (121); the stepping driver assembly (11) is connected to one end of the valve core plunger (122); the stepping driver assembly (11) can drive the valve core plunger (122) to move along the axial direction of the valve core cage (121); the valve core cage (121) is provided with a flow regulating hole (1211) along the circumferential direction; and the valve core plunger (122) can adjust the exposed area of ​​the flow regulating hole (1211); A throttle valve hydraulic stepping drive and opening signal detection module (5), the throttle valve hydraulic stepping drive and opening signal detection module (5) being connected to an opening input end of the underwater throttle valve assembly (1), the throttle valve hydraulic stepping drive and opening signal detection module (5) being capable of collecting the opening and corresponding number of steps of the underwater throttle valve assembly (1); as well as A CV test and CV value accuracy judgment calculation module (6), wherein the CV test and CV value accuracy judgment calculation module (6) is connected to the high-pressure water pump (41) and the low flow meter (42) of the detection component (4), and the CV test and CV value accuracy judgment calculation module (6) is capable of collecting the CV value of the underwater throttle valve assembly (1).

2. The underwater throttle valve CV flow characteristic curve test system according to claim 1 is characterized in that: The valve body assembly (12) includes a valve body (123) and a valve stem (124); the valve core cage (121) is arranged in the valve body (123); the throttle valve inlet is connected to the throttle valve outlet through the flow regulating hole (1211); the valve core plunger (122) is arranged in the valve core cage (121); one end of the valve core plunger (122) extends out of the valve core cage (121) and is connected to the valve stem (124); and the end of the valve stem (124) away from the valve core plunger (122) is connected to the stepping drive assembly (11).

3. The underwater throttle valve CV flow characteristic curve test system according to claim 2 is characterized in that: The detection component (4) comprises the high-pressure water pump (41), the low-pressure flow meter (42), a thermometer (43), a first pressure gauge (44), a second pressure gauge (45) and a third pressure gauge (46); the high-pressure water pump (41), the thermometer (43), the low-pressure flow meter (42), the first pressure gauge (44), the second pressure gauge (45) and the third pressure gauge (46) are respectively connected to the CV test and CV value accuracy judgment calculation module (6); the distance from the first pressure gauge (44) to the throttle valve inlet is the sum of the distance from the second pressure gauge (45) to the throttle valve inlet and the distance from the third pressure gauge (46) to the throttle valve outlet; The high-pressure water pump (41), the thermometer (43), the low-pressure flowmeter (42), the first pressure gauge (44) and the second pressure gauge (45) are arranged on the inlet test pipe (2); the high-pressure water pump (41), the thermometer (43), the low-pressure flowmeter (42), the first pressure gauge (44) and the second pressure gauge (45) are successively close to the throttle valve inlet; and the third pressure gauge (46) is arranged on the outlet test pipe (3).

4. The underwater throttle valve CV flow characteristic curve test system according to claim 3 is characterized in that: The stepper drive assembly (11) comprises an LVDT displacement sensor (1101), and the LVDT displacement sensor (1101) is connected to the valve stem (124).

5. The underwater throttle valve CV flow characteristic curve test system according to claim 4 is characterized in that: The throttle valve hydraulic stepping drive and opening signal detection module (5) comprises an opening communication module (501), an opening signal acquisition module (502), a driver pressure acquisition module (503), an HPU pulse hydraulic system (504), a solenoid valve control module (505), an open circuit output pressure sensor (506), a closed circuit output pressure sensor (507), an open circuit two-position three-way solenoid valve (508), and a closed circuit two-position three-way solenoid valve (509); The opening signal acquisition module (502) is connected to the LVDT displacement sensor (1101), the driver pressure acquisition module (503) is connected to the open circuit output pressure sensor (506) and the closed circuit output pressure sensor (507), respectively, the HPU pulse hydraulic system (504) is connected to the opening signal acquisition module (502) and the driver pressure acquisition module (503), respectively, the HPU pulse hydraulic system (504) is connected to the solenoid valve control module (505), and the solenoid valve control module (505) controls the open circuit two-position three-way solenoid valve (508) and the closed circuit two-position three-way solenoid valve (509).

6. The underwater throttle valve CV flow characteristic curve test system according to claim 4, characterized in that: The CV test and CV value accuracy judgment calculation module (6) comprises a CV communication module (61), a CV calculation and CV value accuracy judgment calculation module (62), a pressure signal acquisition module (63), and a flow control and acquisition module (64).

7. The underwater throttle valve CV flow characteristic curve testing system according to claim 6, characterized in that: The pressure signal acquisition module (63) and the flow control and acquisition module (64) are respectively connected to the CV calculation and CV value accuracy judgment calculation module (62); the thermometer (43), the first pressure gauge (44), the second pressure gauge (45) and the third pressure gauge (46) are respectively connected to the pressure signal acquisition module (63); and the high-pressure water pump (41) and the low-pressure flow meter (42) are respectively connected to the flow control and acquisition module (64).

8. The underwater throttle valve CV flow characteristic curve testing system according to claim 7, characterized in that: The CV test and CV value accuracy judgment calculation module (6) is capable of judging the upper limit pressure difference and the lower limit pressure difference; The method for the CV test and CV value accuracy judgment calculation module (6) to judge the upper limit pressure difference includes: determining the upper limit blocking pressure difference value and the calculation formula Through actual test, the pressure difference ΔP is less than ΔP choke The blocking pressure difference comparison limits the accuracy of the CV test value. The test pressure difference value higher than the blocking pressure difference is screened out through system programming to ensure that the pressure difference value input for the test CV value calculation is less than the blocking pressure difference, thereby ensuring the accuracy of the test CV. Among them, the F LP is the throttle valve flow recovery coefficient, the F P is the pipeline geometry correction coefficient, Pb is the throttle valve inlet pressure value, and P V is the absolute vapor pressure of the medium at the inlet temperature, the F F Liquid critical compression ratio coefficient, The Pc is the absolute thermodynamic critical pressure; The method for the CV test and CV value accuracy judgment calculation module (6) to judge the lower limit pressure difference includes: Reynolds coefficient, the lower limit pressure difference of the CV test process is judged by the flow Reynolds coefficient value greater than 10000. When the pressure difference is less than the lower limit pressure difference, the medium flow Reynolds coefficient is less than 10000, and the flow channel medium flow is laminar flow. When the pressure difference is greater than the lower limit pressure difference, the medium flow Reynolds coefficient is greater than 10000, and the flow channel medium flow is turbulent. Through system programming, the test pressure difference in which the medium flow Reynolds coefficient is less than 10000 and the flow channel medium flow is laminar flow is screened out, ensuring that the pressure difference calculated by the CV test is greater than the test pressure in which the medium flow Reynolds coefficient is greater than 10000 and the flow channel medium flow is turbulent, ensuring high CV test accuracy. Among them, the F d is the throttle correction factor, the F L is the throttle valve flow recovery coefficient, CV is the CV value tested at this opening, Q is the medium flow through the underwater throttle valve at this opening; υ is the kinematic viscosity of the medium at the inlet temperature, and D is the inlet pipe diameter; The CV value and the corresponding opening between the upper pressure difference and the lower pressure difference are obtained, and the underwater throttle valve CV flow characteristic test system (7) is programmed to draw the CV and the opening curve of the underwater throttle valve, and output the CV characteristic curve of the underwater throttle valve assembly (1).

9. A flow regulation method, characterized in that: It comprises an underwater throttle valve CV flow characteristic testing system as described in any one of claims 1-8.

10. The flow rate regulating method according to claim 9, characterized in that: The flow regulation method comprises: Step 1: Based on the oil and gas well production parameters, The flow characteristic calculation formula calculates the CV value of the oil and gas well corresponding to the production adjustment demand. Wherein, Qc is the production, ΔPc is the pressure difference between the throttle valve inlet and the throttle valve outlet, and Gfc is a parameter of the oil and gas well medium density; Step 2: Determine the adjustment opening and throttle valve step corresponding to the CV value of the underwater throttle valve in combination with the CV flow characteristic curve of the underwater throttle valve.

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