CN116046778B - On-line visual test equipment and method for hydrate generation and inhibition effect - Google Patents
On-line visual test equipment and method for hydrate generation and inhibition effect Download PDFInfo
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- CN116046778B CN116046778B CN202310205179.3A CN202310205179A CN116046778B CN 116046778 B CN116046778 B CN 116046778B CN 202310205179 A CN202310205179 A CN 202310205179A CN 116046778 B CN116046778 B CN 116046778B
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Abstract
The invention belongs to the technical field of oil and gas safety engineering, and particularly discloses online visual test equipment and method for hydrate generation and inhibition effect, wherein the equipment comprises a throttle control system, an inhibitor injection system, a visual kettle body, a temperature control system and a data acquisition system; the throttling control system comprises a throttling device main body, a transmission mechanism, a throttling mechanism and the like, and controls the movable baffle to rotate through the transmission mechanism so as to regulate and control the fluid flow area in cooperation with the fixed baffle; the temperature control system can control the temperature of the heat conducting liquid in the annular space of the visual kettle body; the visual kettle body can obtain dynamic images formed by the internal hydrate of the visual kettle body, and information is transmitted to the imaging controller. The method is suitable for field test of the hydrate inhibitor in the natural gas transportation process, can determine hydrate generation conditions and pressure drop changes under different flow temperatures and switch well working conditions, and effectively improves the accuracy of performance evaluation of the inhibitor compared with indoor experiments.
Description
Technical Field
The invention belongs to the technical field of oil and gas safety engineering, and particularly relates to online visual test equipment and method for hydrate generation and inhibition effect.
Background
The natural gas hydrate is a cage-type compound of ice and snow-like crystals formed by water molecules and gas small molecules under the conditions of low temperature and high pressure, not only can cause problems of blockage of a shaft, a pipeline, a valve and the like, but also can cause trapping pressure and pipeline rupture, so that the safety production of natural gas is seriously influenced, the society, economy and environment are greatly influenced, and disastrous accidents in various aspects can be associated. The addition of hydrate inhibitors is a common measure for prevention and treatment, and the formation of the hydrate is inhibited by adding a proper amount of the inhibitor into a shaft or a pipeline, changing the thermodynamic conditions of the formation of the natural gas hydrate and the like. At present, the performance evaluation of the hydrate inhibitor mainly comprises an indoor experiment, including a static stirring kettle, a shaking type reaction kettle and experimental loops with different scales, but the on-site working condition cannot be truly simulated, so that the design of the on-line visual test equipment for the hydrate generation and inhibition effect has great engineering application value.
The invention patent CN201911124748.1 designs a visual swinging kettle device and a visual swinging kettle method for inhibiting the blocking of a pipeline hydrate, which mainly comprise a main high-pressure visual kettle, a driving control system, a gas-liquid injection and discharge system, a temperature control system and a data acquisition system, wherein the change of the growth form of the hydrate in the pipeline is observed in real time by means of the main high-pressure visual kettle, the swinging frequency and the angle of the visual kettle are controlled by the driving control system, the flow of fluid in the pipeline is simulated, and the air cooling refrigeration of a low-temperature constant-temperature chamber is applied, so that the problem of the surface fogging of the visual kettle is solved. However, the test device simulates the fluid flow in the pipeline through swinging, the reaction kettle is small in volume, the fluid flow speed and the fluid state are difficult to control, the formation process of the hydrate can be interfered, and the accuracy of the performance evaluation of the hydrate inhibitor is reduced.
The invention patent CN202010062969.7 designs a visual high-pressure microfluidic hydrate simulation experiment device, which mainly comprises a micro-fluid injection and pressure control unit, a pressure-resistant microfluidic hydrate reaction unit, a temperature control unit, a generated gas treatment unit and a real-time display unit, wherein the units are connected through pipelines or data lines and controlled through corresponding valves or switches, so that the microscopic process of the hydrate reaction can be clearly observed in real time. However, the device simulates a low-temperature high-pressure environment where the natural gas hydrate is located through a microfluidic technology, the simulation situation is greatly different from the actual situation on site, and in addition, the method is mainly aimed at the natural gas hydrate in stratum porous medium and is not suitable for a natural gas conveying mode of a large-diameter pipeline.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the online visual test equipment and the online visual test method for the hydrate generation and inhibition effect, which effectively solve the problems that the device for evaluating the hydrate inhibitor performance is difficult to simulate on-site reality at the present stage, so that the evaluation accuracy is lower.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides online visual test equipment for hydrate generation and inhibition effect, which comprises a throttle control system, an inhibitor injection system, a visual kettle body, a temperature control system and a data acquisition system, wherein the throttle control system is used for controlling the generation of hydrate;
The throttling control system comprises a throttling device main body, a front butterfly valve, a rear butterfly valve, a stepping motor, a rotation angle sensor, a transmission mechanism and a throttling mechanism; the main body of the throttling device consists of an upper throttling seat and a lower throttling seat, a central hole is formed in the upper throttling seat, and the axis of the central hole is perpendicular to the plane where the upper end face and the lower end face of the upper throttling seat are located; the lower throttling seat comprises a box body, a left pipe body and a right pipe body which are connected with the lower part of the box body, and the box body is fixedly connected with the lower end face of the upper throttling seat and is communicated with the central hole; the left side pipe body is provided with a pressure gauge, and the right side pipe body is provided with an injection valve connected with the inhibitor injection system; one end of the front butterfly valve is fixedly connected with a site wellhead bypass, and the other end of the front butterfly valve is fixedly connected with a left end outer pipe orifice of the left pipe body; one end of the visual kettle body is connected with the right-end outer pipe orifice of the right-side pipe body, the other end of the visual kettle body is connected with the rear-end butterfly valve, and the other end of the rear-end butterfly valve is connected with a field pipeline; the temperature control system is connected with the visual kettle body and used for controlling the temperature of the heat conducting liquid in the annular space of the visual kettle body; the data acquisition system is arranged outside the visual kettle body and is used for obtaining dynamic images formed by hydrates in the visual kettle body and transmitting information to the imaging controller; the output shaft of the stepping motor is provided with the rotation angle sensor, and the stepping motor and the rotation angle sensor are electrically connected with the imaging controller;
The transmission mechanism comprises a driving shaft, a driven shaft, a bevel pinion and a bevel gear, wherein the driving shaft penetrates through the central hole and stretches into the box body, the upper end of the driving shaft is connected with an output shaft of the stepping motor, the lower end of the driving shaft is connected with the driven shaft consistent with the axis of the driving shaft through a coupling, and the lower end of the driven shaft is connected with the bevel pinion and keeps the axial direction and the circumferential direction of the bevel pinion fixed; the small bevel gear is meshed with the big bevel gear on one side in a mutual holding way;
the throttling mechanism comprises a movable baffle plate and a fixed baffle plate, a plurality of first fan blades and first windows are arranged on the movable baffle plate, and the first fan blades and the first windows are distributed at equal angle intervals in the circumferential direction; the movable baffle is fixedly connected with the large bevel gear and can be driven by the large bevel gear to rotate; the fixed baffle is provided with a plurality of second fan blades and second windows, and the number and the angles of the second fan blades and the second windows are correspondingly consistent with those of the first fan blades and the first windows on the movable baffle; the fixed baffle is fixedly connected with the left end of the right side pipe body, and the movable baffle is rotatably arranged at the right end of the left side pipe body.
By adopting the technical scheme, the online visual test equipment for the hydrate generation and inhibition effect mainly comprises a throttling control system, an inhibitor injection system, a visual kettle body, a temperature control system and a data acquisition system; the throttling control system comprises a throttling device main body, a transmission mechanism, a throttling mechanism and the like, and controls the movable baffle to rotate through the transmission mechanism so as to regulate and control the fluid flow area in cooperation with the fixed baffle; the temperature control system can control the temperature of the heat conducting liquid in the annular space of the visual kettle body; the visual kettle body can obtain dynamic images formed by the internal hydrate of the visual kettle body, and information is transmitted to the imaging controller. The method is suitable for field test of the hydrate inhibitor in the natural gas transportation process, can determine hydrate generation conditions and pressure drop changes under different flow temperatures and switch well working conditions, and effectively improves the accuracy of performance evaluation of the inhibitor compared with indoor experiments.
Preferably, a plurality of threaded holes are formed in the upper throttling seat in the circumferential direction of the lower end face, a sealing gasket is arranged at the top of the box body, and the box body is fixedly connected with the lower end face of the upper throttling seat through screws; the structural dimensions of the front butterfly valve and the rear butterfly valve are kept consistent.
Preferably, the transmission mechanism further comprises a roller bearing, and the central hole is provided with a bearing positioning protrusion; the roller bearing is consistent with the axis of the central hole and is in interference fit with the inner wall of the bearing positioning protrusion; the upper end of the roller bearing is coaxially provided with a sealing ring and an end cover from bottom to top, a plurality of threaded holes are formed in the circumferential direction of the upper end surface in the upper throttling seat, and the end cover is fixedly connected with the upper end surface through screws;
the upper end of the driving shaft is fixedly connected with the stepping motor, and the driving shaft coaxially penetrates through the roller bearing and is in interference fit with an inner hole of the roller bearing;
the lower end of the driving shaft is provided with a half key groove A, and the upper end of the driven shaft is provided with a half key groove B; the coupler comprises a coupler upper seat, a coupler lower seat and a flat key B, wherein a flat key groove B is formed in the inner wall of the coupler upper seat, and the size of the flat key groove B is consistent with the combined size of the half key groove A and the half key groove B; the upper base of the coupler is connected with the lower base of the coupler through bolts to realize the axial fixation of the coupler; the flat key B is arranged in corresponding key grooves of the driving shaft and the driven shaft, and the flat key B and the flat key groove B are in clearance fit to realize circumferential fixation of the coupler;
A flat key A is arranged at the lower end of the driven shaft, a flat key groove A is arranged in an inner hole of the bevel pinion, and the flat key A and the flat key groove A are matched to realize circumferential fixation of the bevel pinion; meanwhile, an external thread is arranged on the peripheral surface of the lower end of the driven shaft and matched with a gland, so that the bevel pinion is axially fixed.
Preferably, the throttle control system further comprises a sealing mechanism for forming mechanical seal between the driving shaft and the upper throttle seat, a seal positioning protrusion is arranged on the central hole, and a step is arranged in the middle section of the driving shaft to realize axial positioning of the sealing mechanism;
the sealing mechanism comprises a static sealing ring, a dynamic sealing ring, a push ring, a sealing spring and a spring seat which are arranged from top to bottom along the central axis of the driving shaft, wherein the static sealing ring is consistent with the axis of the central hole and is in interference fit with the inner wall of the sealing positioning protrusion; the lower end face of the static sealing ring is provided with a sealing band consisting of a cylindrical surface and an arc surface, the upper end of the dynamic sealing ring is provided with a sealing groove, and the sealing groove is tightly attached to the sealing band; a spline groove is formed in the lower end of the movable sealing ring, a spline is formed in the upper end of the push ring, and the spline is in interference fit with the spline groove; the lower end of the push ring is provided with a positioning cylinder for realizing circumferential fixation of the upper end of the sealing spring; the sealing spring is arranged between the spring seat and the push ring and is in a compressed state; the spring seat realizes axial positioning through the step of driving shaft, and with driving shaft fixed connection, also be equipped with the location cylinder on the spring seat, be used for realizing the circumference of seal spring lower extreme is fixed.
Preferably, the upper half surface of the outer periphery of the left end of the right side pipe body is provided with a fixed groove, and the upper half surface of the outer periphery of the right end of the left side pipe body is provided with a movable groove; the fixed baffle is fixedly connected with the fixed groove through a screw; the left side surface of the movable groove is flush with the bottom end of the large bevel gear, and the right side surface of the movable groove is flush with the left side of the fan blade on the movable baffle; the left side face of the fixed groove is flush with the right side of the fan blade II on the fixed baffle, and the right side face of the fixed groove is flush with the right end face of the fixed baffle.
Preferably, the inhibitor injection system comprises an injection agent cylinder, an injection pump, a flow valve, an injection pump switch and an injection pressure gauge;
the injection agent cylinder is communicated with the injection pump through a first pipeline; the circulating valve is arranged on the first pipeline and used for controlling the circulation of fluid in the first pipeline; the liquid injection pump is electrically connected with the liquid injection pump switch, and the liquid injection pump is connected with the liquid injection valve through a second pipeline; the injection pressure gauge is used for monitoring the pressure of the fluid after the fluid exits the injection pump.
Preferably, the visual kettle body comprises a reaction kettle outer cylinder, a sapphire inner cylinder, a flange seat, a thermometer, a liquid inlet and a liquid outlet;
A flange seat is fixedly welded at the outer sides of two ends of the outer cylinder of the reaction kettle respectively; pre-metallizing the outer surface of the sapphire inner cylinder to obtain a pre-metallized band, and fixing the pre-metallized band and the flange seat by brazing with brazing filler metal; the upper part of the outer barrel of the reaction kettle is provided with a thermometer, the side surface of the outer barrel is provided with a visual window seat, a visual window cover and a sealing ring, and the visual window cover is fixedly connected with the visual window seat through a screw; a groove is formed in the visible window seat and used for placing the sealing ring; a sapphire window is embedded in the visible window cover; the same axis of the outer cylinder of the reaction kettle is respectively provided with the liquid inlet and the liquid outlet.
Preferably, the data acquisition system comprises a high-speed camera, a camera base, a positioning rod and the imaging controller;
the side edge of the camera seat is provided with a ring groove, and the upper surface of the camera seat is provided with a plurality of limit grooves along the trend of the ring groove; the positioning seat is in an inverted U shape and is arranged above the camera seat; the bottom of the high-speed camera is provided with an external thread column, and the external thread column is connected with an internal thread hole in the middle of the top end of the positioning seat in a matched manner, so that the high-speed camera is connected to the camera seat; the camera of the high-speed camera is aligned with the sapphire window, and meanwhile, the high-speed camera is electrically connected with the imaging controller to transmit information; the top end of the positioning seat is also provided with a fulcrum groove, the positioning rod comprises a limit cylinder, a semicircular fulcrum and a spring groove, the semicircular fulcrum is tightly attached in the fulcrum groove, one end of the semicircular fulcrum is connected with the limit cylinder, and the other end of the semicircular fulcrum is connected with the spring; the limiting cylinder vertically penetrates through the top surface of the positioning seat and can extend into the limiting groove below the positioning seat, so that the positions of the high-speed cameras with different angles are fixed; the bottom surface of the corresponding end of the semicircular fulcrum is provided with the spring groove, the top end of the spring is fixed in the spring groove, and the bottom end of the spring is fixedly connected with the upper surface of the positioning seat; the two sides of the semicircular fulcrum are restrained from displacing on a vertical plane by a positioning stud, a positioning base with a positioning hole and a nut which are rotationally connected with the semicircular fulcrum; and a plurality of rollers fixed by nuts and roller rods are arranged on two sides of the positioning seat, and the outer sides of the rollers are tangent with the inner sides of the annular grooves.
Preferably, the temperature control system comprises a liquid storage tank, a liquid storage valve, a circulating pump, a throttle valve, a condenser, a compression pump, a heater, a liquid outlet valve and a liquid inlet valve;
the transparent heat conduction liquid is filled in the liquid storage tank, and the liquid storage tank is in threaded sealing connection with the liquid storage valve; the circulating pump is of a three-way structure, and the liquid outlet valve, the circulating pump, the throttle valve, the condenser, the compression pump, the heater and the liquid inlet valve are sequentially connected through a pipeline III; the liquid storage valve is connected with the circulating pump through a pipeline IV; the liquid inlet valve is in threaded sealing connection with the liquid inlet hole, and the liquid outlet valve is in threaded sealing connection with the liquid outlet hole.
The invention also provides an online visual test method for the hydrate generation and inhibition effect, which adopts the online visual test equipment for the hydrate generation and inhibition effect and comprises the following steps:
step one, completing the assembly of hydrate generation and inhibition effect online visual test equipment on site, and detecting whether each device works normally or not and whether a pipeline leaks or not;
step two, starting a stepping motor through the imaging controller, and closing the stepping motor when the angle of the rotation angle sensor transmitted back to the imaging controller reaches a test value, so that the fluid flow area of the movable baffle plate and the fixed baffle plate after being matched can be calculated, and the fluid flow area is consistent with the test requirement; if the well opening and closing process is required to be simulated, the stepping motor is kept in an opening state, so that the fluid flow area of the movable baffle plate and the fixed baffle plate after being matched is in dynamic change, otherwise, the step is omitted;
Step three, injecting the hydrate inhibitor to be tested into the visual kettle body through an inhibitor injection system;
step four, if the pressure drop change after the hydrate inhibitor is added is required to be evaluated, simultaneously closing a front butterfly valve and a rear butterfly valve, filling nitrogen into the inhibitor injection system, and recording the pressure value change in the left pipe body through a pressure gauge, otherwise, neglecting the step;
step five, starting devices of each part of the temperature control system to regulate and control the temperature, so that the temperature display result is consistent with the test requirement;
step six, controlling the shooting angle of the high-speed camera through a data acquisition system;
step seven, collecting experimental data, and recording the angle shown by the rotation angle sensor and the change relation of temperature and pressure along with time; recording the shooting angle of a high-speed camera, and monitoring the generation condition of natural gas hydrate in the visual kettle body in real time through the high-speed camera to obtain a dynamic process of the change of the form of the hydrate along with time;
step eight, regulating and controlling the stepping motor through the imaging controller, enabling the movable baffle plate to be completely overlapped with the first fan blade and the second fan blade of the fixed baffle plate, opening the front butterfly valve and the rear butterfly valve, closing each device in the temperature control system and the data acquisition system, and completing the field test process of the hydrate inhibitor.
Compared with the prior art, the online visual test equipment and method for the hydrate generation and inhibition effect provided by the invention can realize the following technical effects:
1. the front butterfly valve is fixedly connected with the on-site wellhead bypass, the rear butterfly valve is fixedly connected with the on-site pipeline, the front butterfly valve and the rear butterfly valve are both in an open state, and the movable baffle plate is overlapped with the fan blade of the fixed baffle plate, so that the normal conveying of natural gas is not influenced.
2. The invention can effectively control the flow area of fluid in the pipeline by means of the throttling control system, and can realize the field test of the inhibitor under the working conditions of different temperatures, pressures, flow rates and switch wells by combining the inhibitor injection system and the temperature control system; and meanwhile, the butterfly valves at the front end and the rear end are closed, so that the pressure drop change in the sealed pipeline after the inhibitor is added can be determined, and the effect of the inhibitor is further evaluated.
3. The visual kettle body adopts the sapphire inner barrel and the sapphire window, and dynamic processes formed by hydrates at different angles can be shot through the high-speed camera and the camera base and transmitted to the imaging controller to obtain dynamic images formed by the hydrates, so that the accuracy of evaluating the inhibitor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only embodiments of the present invention, and other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall arrangement of an online visual test device for hydrate generation and inhibition effect provided by an embodiment of the invention;
FIG. 2 is an isometric view of a partial cross-sectional view of a throttle control system provided in an embodiment of the invention;
FIG. 3 is an enlarged view of a portion of FIG. 2A provided in accordance with an embodiment of the present invention;
FIG. 4 is an isometric view of a partial cross-sectional view of a coupling provided in accordance with an embodiment of the present invention;
FIG. 5 is an isometric view of a partial cross-sectional view of a transmission and throttle mechanism provided in an embodiment of the invention;
FIG. 6 is an isometric view of a partially broken away view of a seal mechanism according to an embodiment of the invention;
FIG. 7 is an isometric view of a partial cross-sectional view of a visual kettle body provided by an embodiment of the present invention;
FIG. 8 is an isometric view of a high speed camera and camera mount provided in accordance with an embodiment of the present invention;
FIG. 9 is an enlarged view of a portion of FIG. 8B provided by an embodiment of the present invention;
FIG. 10 is an isometric view of an inhibitor injection system according to an embodiment of the present invention;
FIG. 11 is an isometric view of a front end butterfly valve provided in an embodiment of the invention;
reference numerals: 1-front butterfly valve, 2-manometer, 3-throttle device body, 4-rotation angle sensor, 5-stepper motor, 6-inhibitor injection system, 7-reservoir, 8-reservoir valve, 9-conduit four, 10-circulation pump, 11-throttle valve, 12-condenser, 13-compression pump, 14-conduit three, 15-heater, 16-rear butterfly valve, 17-high speed camera, 18-camera mount, 19-imaging controller, 20-injector valve, 21-conduit two, 22-outlet valve, 23-thermometer, 24-inlet valve, 25-lower end face, 26-center hole, 27-upper end face, 28-drive shaft, 29-seal positioning boss, 30-upper throttle seat, 31-lower throttle seat, 32-coupling, 33-driven shaft, 34-right side pipe body, 35-box body, 36-left side pipe body, 37-bearing positioning protrusion, 38-end cover, 39-sealing ring, 40-roller bearing, 41-flat key groove B, 42-coupling upper seat, 43-half key groove A, 44-flat key B, 45-coupling lower seat, 46-half key groove B, 47-movable groove, 48-movable baffle, 49-large bevel gear, 50-small bevel gear, 51-flat key groove A, 52-flat key A, 53-gland, 54-fixed baffle, 55-fixed groove, 56-window two, 57-fan blade two, 58-spring seat, 59-sealing spring, 60-positioning cylinder, the device comprises a push ring, a 62-movable sealing ring, a 63-static sealing ring, a 64-sealing belt, a 65-sealing groove, a 66-spline groove, a 67-spline, a 68-flange seat, a 69-reaction kettle outer cylinder, a 70-liquid inlet, a 71-sapphire inner cylinder, a 72-liquid outlet, a 73-premetallizing belt, a 74-sealing ring, a 75-sapphire window, a 76-visible window cover, a 77-visible window seat, a 78-positioning seat, a 79-limiting groove, a 80-annular groove, a 81-positioning rod, a 82-roller rod, a 83-limiting cylinder, a 84-positioning stud, a 85-semicircle fulcrum, a 86-spring groove, a 87-spring, a 88-fulcrum groove, a 89-positioning hole, a 90-roller, a 91-sealing gasket, a 92-liquid injection pump, a 93-pipeline I, a 94-liquid injection pump switch, a 95-injection pressure gauge, a 96-flow valve and a 97-injection cylinder.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Examples:
fig. 1-11 are schematic diagrams of the whole and part of the on-line visual test equipment for hydrate generation and inhibition effect, and the invention specifically discloses the on-line visual test equipment for hydrate generation and inhibition effect and a method thereof, comprising the following steps:
the on-line visual test equipment for the hydrate generation and inhibition effect comprises a throttling control system, an inhibitor injection system 6, a visual kettle body, a temperature control system and a data acquisition system.
In the embodiment of the invention, the throttle control system comprises a throttle device main body 3, a front butterfly valve 1, a rear butterfly valve 16, a stepping motor 5, a rotation angle sensor 4, a transmission mechanism and a throttle mechanism; the throttle device main body 3 consists of an upper throttle seat 30 and a lower throttle seat 31, the upper throttle seat 30 is provided with a central hole 26, and the axis of the central hole 26 is vertical to the plane of the upper end surface 27 and the lower end surface 25 of the upper throttle seat 30; the lower throttle seat 31 comprises a box body 35, a left pipe body 36 and a right pipe body 34 which are connected with the lower part of the box body 35, wherein the box body 35 is fixedly connected with the lower end face 25 of the upper throttle seat 30 and is communicated with the central hole 26; the left pipe body 36 is provided with a pressure gauge 2, and the right pipe body 34 is provided with an injection valve 20 connected with the inhibitor injection system 6; one end of the front butterfly valve 1 is fixedly connected with a site wellhead bypass through a bolt, and the other end of the front butterfly valve is fixedly connected with a left end outer pipe opening of the left pipe body 36 through a bolt; one end of the visual kettle body is connected with the right end outer pipe orifice of the right pipe body 34 through a bolt, the other end of the visual kettle body is connected with the rear end butterfly valve 16 through a bolt, and the other end of the rear end butterfly valve 16 is connected with a field pipeline through a bolt. The structural dimensions of the front butterfly valve 1 and the rear butterfly valve 16 are consistent.
More specifically, a plurality of threaded holes are formed in the circumferential direction of the lower end surface 25 of the upper throttle seat 30, a sealing gasket 91 is arranged at the top of the box 35, and the box 35 is fixedly connected with the lower end surface 25 of the upper throttle seat 30 through screws.
In the embodiment of the invention, the transmission mechanism comprises a driving shaft 28, a driven shaft 33, a bevel pinion 50 and a bevel big gear 49, wherein the driving shaft 28 penetrates through a central hole 26 and stretches into a box 35, the upper end of the driving shaft 28 is connected with an output shaft of a stepping motor 5, the lower end of the driving shaft is connected with the driven shaft 33 which is consistent with the axis of the driving shaft through a coupler 32, and the lower end of the driven shaft 33 is connected with the bevel pinion 50 and keeps the axial direction and the circumferential direction of the bevel pinion 50 fixed; the small bevel gear 50 is held in engagement with the large bevel gear 49 on one side.
More specifically, the transmission mechanism further comprises a roller bearing 40, and the central hole 26 is provided with a bearing positioning protrusion 37; the roller bearing 40 is consistent with the axis of the central hole 26 and is in interference fit with the inner wall of the bearing positioning boss 37; the upper end of the roller bearing 40 is coaxially provided with a sealing ring 39 and an end cover 38 from bottom to top, a plurality of threaded holes are formed in the circumference of the upper end face 27 in the upper throttle seat 30, and the end cover 38 is fixedly connected with the upper end face 27 through screws;
the upper end of the driving shaft 28 is fixedly connected with the stepping motor 5, and the driving shaft 28 coaxially penetrates through the roller bearing 40 and is in interference fit with an inner hole of the roller bearing 40;
The lower end of the driving shaft 28 is provided with a half key groove A43, and the upper end of the driven shaft 33 is provided with a half key groove B46; the coupler 32 comprises a coupler upper seat 42, a coupler lower seat 45 and a flat key B44, wherein a flat key groove B41 is formed in the inner wall of the coupler upper seat 42, and the size of the flat key groove B41 is consistent with the combined size of the half key groove A43 and the half key groove B46; the upper coupler seat 42 and the lower coupler seat 45 are connected through bolts to realize the axial fixation of the coupler 32; the flat key B44 is arranged in the corresponding key grooves of the driving shaft 28 and the driven shaft 33, and meanwhile, the flat key B44 and the flat key groove B41 are in clearance fit to realize circumferential fixation of the coupler 32;
the lower end of the driven shaft 33 is provided with a flat key A52, the inner hole of the bevel pinion 50 is provided with a flat key groove A51, and the flat key A52 and the flat key groove A51 are matched to realize the circumferential fixation of the bevel pinion 50; meanwhile, an external thread is provided on the outer peripheral surface of the lower end of the driven shaft 33, and the external thread is matched with a gland 53 to realize the axial fixation of the bevel pinion 50.
Meanwhile, the throttle control system further comprises a sealing mechanism for forming mechanical seal between the driving shaft 28 and the upper throttle seat 30, a sealing positioning protrusion 29 is arranged on the central hole 26, and a step is arranged in the middle section of the driving shaft 28 to realize axial positioning of the sealing mechanism;
The sealing mechanism comprises a static sealing ring 63, a movable sealing ring 62, a push ring 61, a sealing spring 59 and a spring seat 58 which are arranged from top to bottom along the central axis of the driving shaft, wherein the static sealing ring 63 is consistent with the axis of the central hole 26 and is in interference fit with the inner wall of the sealing positioning protrusion 29; the lower end surface 25 of the static sealing ring 63 is provided with a sealing band 64 consisting of a cylindrical surface and an arc surface, the upper end of the movable sealing ring 62 is provided with a sealing groove 65, and the sealing groove 65 is tightly attached to the sealing band 64; a spline groove 66 is formed in the lower end of the movable sealing ring 62, a spline 67 is formed in the upper end of the push ring 61, and the spline 67 is in interference fit with the spline groove 66; the lower end of the push ring 61 is provided with a positioning cylinder 60 for realizing the circumferential fixation of the upper end of the sealing spring 59; the seal spring 59 is placed between the spring seat 58 and the push ring 61, and is in a compressed state; the spring seat 58 is axially positioned by a step of the driving shaft 28 and is fixedly connected with the driving shaft 28 by a screw, and a positioning cylinder 60 is also arranged on the spring seat 58 and is used for realizing circumferential fixation of the lower end of the sealing spring 59.
In the embodiment of the invention, the throttling mechanism comprises a movable baffle 48 and a fixed baffle 54, wherein a plurality of first fan blades and first windows are arranged on the movable baffle 48, and the first fan blades and the first windows are distributed at equal angle intervals in the circumferential direction; the movable baffle 48 is fixedly connected with the large bevel gear 49 through a screw and can be driven to rotate by the large bevel gear 49; the fixed baffle 54 is provided with a plurality of second fan blades 57 and second windows 56, and the number and the angle of the second fan blades 57 and the second windows 56 are correspondingly consistent with those of the first fan blades and the first windows on the movable baffle 48; the fixed stop 54 is fixedly connected to the left end of the right tube 34 and the flapper 48 is rotatably mounted to the right end of the left tube 36.
More specifically, the upper half of the left end periphery of the right tube 34 is provided with a fixed slot 55, and the upper half of the right end periphery of the left tube 36 is provided with a movable slot 47; the fixed baffle 54 is fixedly connected with the fixed groove 55 through a screw; the left side surface of the movable groove 47 is level with the bottom end of the large bevel gear 49, and the right side surface is level with the left side of the fan blade on the movable baffle 48; the left side surface of the fixing groove 55 is flush with the right side of the second fan blade 57 on the fixing baffle 54, and the right side surface is flush with the right end surface of the fixing baffle 54.
In the embodiment of the invention, the temperature control system is connected with the visual kettle body and is used for controlling the temperature of the heat conducting liquid in the annular space of the visual kettle body; the data acquisition system is arranged outside the visual kettle body and is used for obtaining dynamic images formed by hydrates in the visual kettle body and transmitting information to the imaging controller 19; the output shaft of the stepping motor 5 is provided with a rotation angle sensor 4, and the stepping motor 5 and the rotation angle sensor 4 are electrically connected with an imaging controller 19.
More specifically, inhibitor injection system 6 includes an injection cartridge 97, an injection pump 92, a flow valve 96, an injection pump switch 94, and an injection pressure gauge 95;
the injection agent cylinder 97 is communicated with the injection pump 92 through a first pipeline 93; the flow valve 96 is installed on the first pipeline 93 to control the flow of the fluid in the first pipeline 93; the injection pump 92 is electrically connected with the injection pump switch 94, and the injection pump 92 is connected with the injection valve 20 through a second pipeline 21; the injection pressure gauge 95 is used to monitor the pressure of the fluid after it exits the injection pump.
More specifically, the visual kettle body comprises a reaction kettle outer cylinder 69, a sapphire inner cylinder 71, a flange seat 68, a thermometer 23, a liquid inlet 70 and a liquid outlet 72;
a flange seat 68 is welded and fixed on the outer sides of two ends of the reaction kettle outer cylinder 69; pre-metallizing the outer surface of the sapphire inner cylinder 71 to obtain a pre-metallized tape 73, and brazing and fixing the pre-metallized tape 73 and the flange seat 68 by adopting brazing filler metal; the upper part of the reaction kettle outer cylinder 69 is provided with a thermometer 23, the side surface of the reaction kettle outer cylinder is provided with a visual window seat 77, a visual window cover 76 and a sealing ring 74, and the visual window cover 76 is fixedly connected with the visual window seat 77 through screws; a groove is arranged in the visible window seat 77 for placing the sealing ring 74; a sapphire window 75 is embedded in the visible window cover 76; the same axis of the reaction kettle outer cylinder 69 is respectively provided with a liquid inlet 70 and a liquid outlet 72.
More specifically, the data acquisition system includes a high speed camera 17, a camera mount 18, a positioning mount 78, a positioning lever 81, and an imaging controller 19;
the side edge of the camera seat 18 is provided with a ring groove 80, and the upper surface is provided with a plurality of limit grooves 79 along the trend of the ring groove 80; the positioning seat 78 is inverted U-shaped and is arranged above the camera seat 18; the bottom of the high-speed camera 17 is provided with an external thread column, and the external thread column is matched and connected with an internal thread hole in the middle of the top end of the positioning seat 78, so that the high-speed camera 17 is connected to the camera seat 18; the camera of the high-speed camera 17 is aligned with the sapphire window 75, and meanwhile, the high-speed camera 17 is electrically connected with the imaging controller 19 to transmit information; the top end of the positioning seat 78 is also provided with a fulcrum groove 88, the positioning rod 81 comprises a limit cylinder 83, a semicircular fulcrum 85 and a spring groove 86, the semicircular fulcrum 85 is tightly attached in the fulcrum groove 88, one end of the semicircular fulcrum 85 is connected with the limit cylinder 83, and the other end is connected with the spring 87; the limit cylinder 83 vertically passes through the top surface of the positioning seat 78 and can extend into the limit groove 79 below the positioning seat 78 to fix the positions of the high-speed cameras 17 with different angles; a spring groove 86 is formed in the bottom surface of the corresponding end of the semicircular fulcrum 85, the top end of the spring 87 is fixed in the spring groove 86, and the bottom end of the spring 87 is fixedly connected with the upper surface of the positioning seat 78; the two sides of the semicircular fulcrum 85 are restrained from displacing on a vertical plane by a positioning stud 84, a positioning base with a positioning hole 89 and a nut which are rotatably connected with the semicircular fulcrum; the positioning seat 78 is provided with a plurality of rollers 90 fixed by nuts and roller rods 82 on both sides, and the outer sides of the rollers 90 are tangent with the inner sides of the ring grooves 80.
More specifically, the temperature control system comprises a liquid storage tank 7, a liquid storage valve 8, a circulating pump 10, a throttle valve 11, a condenser 12, a compression pump 13, a heater 15, a liquid outlet valve 22 and a liquid inlet valve 24;
the transparent heat conducting liquid is filled in the liquid storage tank 7, and the liquid storage tank 7 is in threaded sealing connection with the liquid storage valve 8; the circulating pump 10 is of a three-way structure, and the liquid outlet valve 22, the circulating pump 10, the throttle valve 11, the condenser 12, the compression pump 13, the heater 15 and the liquid inlet valve 24 are sequentially connected through a third pipeline 14; the liquid storage valve 8 is connected with the circulating pump 10 through a pipeline IV 9; the liquid inlet valve 24 is in threaded sealing connection with the liquid inlet hole 70, and the liquid outlet valve 22 is in threaded sealing connection with the liquid outlet hole 72.
The embodiment of the invention also discloses an online visual test method for the hydrate generation and inhibition effect, which adopts the online visual test equipment for the hydrate generation and inhibition effect and comprises the following steps:
step one, completing the assembly of hydrate generation and inhibition effect online visual test equipment on site, and detecting whether each device works normally or not and whether a pipeline leaks or not;
step two, starting the stepping motor 5 through the imaging controller 19, and closing the stepping motor 5 when the angle of the rotation angle sensor 4 transmitted back to the imaging controller 19 reaches a test value, so that the fluid flow area of the movable baffle 48 and the fixed baffle 54 can be calculated and obtained, and the fluid flow area is consistent with the test requirement; if the well switching process is required to be simulated, the stepper motor 5 is kept in an on state, so that the fluid flow area of the movable baffle 48 and the fixed baffle 54 after being matched is in dynamic change, otherwise, the step is omitted;
Step three, placing the hydrate inhibitor to be tested in an injection cylinder 97, sequentially opening a flow valve 96, an injection pump switch 94 and an injection valve 20 to enable the hydrate inhibitor to be injected into the visual kettle body, and then closing the injection valve 20;
step four, if the pressure drop change after the hydrate inhibitor is added is required to be evaluated, simultaneously closing the front butterfly valve 1 and the rear butterfly valve 16, filling nitrogen into the injection agent cylinder 97, opening the flow valve 96, the injection pump switch 94 and the injection agent valve 20 in sequence, and recording the pressure value change in the left pipe body 36 through the pressure gauge 2, otherwise, neglecting the step;
step five, opening a liquid storage valve 8, a liquid inlet valve 24 and a liquid outlet valve 22, and after the heat conducting liquid in the liquid storage tank 7 circulates and fills the annular space inside the visual kettle body, starting all parts of devices of a temperature control system to regulate and control the temperature, so that the display result of a thermometer 23 is consistent with the test requirement;
step six, by pressing one end of the positioning rod 81 close to the spring 87, moving the positioning seat 78 to a designated position along the ring groove 80, and loosening the positioning rod 81 to enable the limiting cylinder 83 and the limiting groove 79 to be meshed with each other, thereby realizing the fixation of the shooting angle of the high-speed camera 17;
step seven, collecting experimental data, and recording the angle shown by the rotation angle sensor 4 and the change relation of temperature and pressure along with time; recording the shooting angle of the high-speed camera 17, and monitoring the generation condition of natural gas hydrate in the sapphire inner barrel 71 in real time through the high-speed camera 17 to obtain a dynamic process of the change of the hydrate form along with time;
Step eight, regulating and controlling the stepping motor 5 through the imaging controller 19, enabling the blades of the movable baffle 48 and the fixed baffle 54 to be completely overlapped, opening the front butterfly valve 1 and the rear butterfly valve 16, closing each device in the temperature control system and the data acquisition system, and finally closing the liquid inlet valve 24, the liquid outlet valve 22 and the liquid storage valve 8 in sequence, so as to complete the field test process of the hydrate inhibitor.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The on-line visual test device for the hydrate generation and inhibition effect is characterized by comprising a throttling control system, an inhibitor injection system, a visual kettle body, a temperature control system and a data acquisition system;
the throttling control system comprises a throttling device main body, a front butterfly valve, a rear butterfly valve, a stepping motor, a rotation angle sensor, a transmission mechanism and a throttling mechanism; the main body of the throttling device consists of an upper throttling seat and a lower throttling seat, a central hole is formed in the upper throttling seat, and the axis of the central hole is perpendicular to the plane where the upper end face and the lower end face of the upper throttling seat are located; the lower throttling seat comprises a box body, a left pipe body and a right pipe body which are connected with the lower part of the box body, and the box body is fixedly connected with the lower end face of the upper throttling seat and is communicated with the central hole; the left side pipe body is provided with a pressure gauge, and the right side pipe body is provided with an injection valve connected with the inhibitor injection system; one end of the front butterfly valve is fixedly connected with a site wellhead bypass, and the other end of the front butterfly valve is fixedly connected with a left end outer pipe orifice of the left pipe body; one end of the visual kettle body is connected with the right-end outer pipe orifice of the right-side pipe body, the other end of the visual kettle body is connected with the rear-end butterfly valve, and the other end of the rear-end butterfly valve is connected with a field pipeline; the temperature control system is connected with the visual kettle body and used for controlling the temperature of the heat conducting liquid in the annular space of the visual kettle body; the data acquisition system is arranged outside the visual kettle body and is used for obtaining dynamic images formed by hydrates in the visual kettle body and transmitting information to the imaging controller; the output shaft of the stepping motor is provided with the rotation angle sensor, and the stepping motor and the rotation angle sensor are electrically connected with the imaging controller;
The transmission mechanism comprises a driving shaft, a driven shaft, a bevel pinion and a bevel gear, wherein the driving shaft penetrates through the central hole and stretches into the box body, the upper end of the driving shaft is connected with an output shaft of the stepping motor, the lower end of the driving shaft is connected with the driven shaft consistent with the axis of the driving shaft through a coupling, and the lower end of the driven shaft is connected with the bevel pinion and keeps the axial direction and the circumferential direction of the bevel pinion fixed; the small bevel gear is meshed with the big bevel gear on one side in a mutual holding way;
the throttling mechanism comprises a movable baffle plate and a fixed baffle plate, a plurality of first fan blades and first windows are arranged on the movable baffle plate, and the first fan blades and the first windows are distributed at equal angle intervals in the circumferential direction; the movable baffle is fixedly connected with the large bevel gear and can be driven by the large bevel gear to rotate; the fixed baffle is provided with a plurality of second fan blades and second windows, and the number and the angles of the second fan blades and the second windows are correspondingly consistent with those of the first fan blades and the first windows on the movable baffle; the fixed baffle is fixedly connected with the left end of the right side pipe body, and the movable baffle is rotatably arranged at the right end of the left side pipe body.
2. The on-line visual test device for hydrate generation and inhibition effect according to claim 1, wherein a plurality of threaded holes are formed in the circumferential direction of the lower end face in the upper throttling seat, a sealing gasket is arranged at the top of the box body, and the box body is fixedly connected with the lower end face of the upper throttling seat through screws; the structural dimensions of the front butterfly valve and the rear butterfly valve are kept consistent.
3. The online visual test device for hydrate generation and inhibition effect according to claim 1, wherein the transmission mechanism further comprises a roller bearing, and the central hole is provided with a bearing positioning protrusion; the roller bearing is consistent with the axis of the central hole and is in interference fit with the inner wall of the bearing positioning protrusion; the upper end of the roller bearing is coaxially provided with a sealing ring and an end cover from bottom to top, a plurality of threaded holes are formed in the circumferential direction of the upper end surface in the upper throttling seat, and the end cover is fixedly connected with the upper end surface through screws;
the upper end of the driving shaft is fixedly connected with the stepping motor, and the driving shaft coaxially penetrates through the roller bearing and is in interference fit with an inner hole of the roller bearing;
The lower end of the driving shaft is provided with a half key groove A, and the upper end of the driven shaft is provided with a half key groove B; the coupler comprises a coupler upper seat, a coupler lower seat and a flat key B, wherein a flat key groove B is formed in the inner wall of the coupler upper seat, and the size of the flat key groove B is consistent with the combined size of the half key groove A and the half key groove B; the upper base of the coupler is connected with the lower base of the coupler through bolts to realize the axial fixation of the coupler; the flat key B is arranged in corresponding key grooves of the driving shaft and the driven shaft, and the flat key B and the flat key groove B are in clearance fit to realize circumferential fixation of the coupler;
a flat key A is arranged at the lower end of the driven shaft, a flat key groove A is arranged in an inner hole of the bevel pinion, and the flat key A and the flat key groove A are matched to realize circumferential fixation of the bevel pinion; meanwhile, an external thread is arranged on the peripheral surface of the lower end of the driven shaft and matched with a gland, so that the bevel pinion is axially fixed.
4. The online visual test device for hydrate generation and inhibition effect according to claim 1 or 3, wherein the throttle control system further comprises a sealing mechanism for forming a mechanical seal between the driving shaft and the upper throttle seat, a seal positioning protrusion is arranged on the central hole, and a step is arranged in the middle section of the driving shaft to realize axial positioning of the sealing mechanism;
The sealing mechanism comprises a static sealing ring, a dynamic sealing ring, a push ring, a sealing spring and a spring seat which are arranged from top to bottom along the central axis of the driving shaft, wherein the static sealing ring is consistent with the axis of the central hole and is in interference fit with the inner wall of the sealing positioning protrusion; the lower end face of the static sealing ring is provided with a sealing band consisting of a cylindrical surface and an arc surface, the upper end of the dynamic sealing ring is provided with a sealing groove, and the sealing groove is tightly attached to the sealing band; a spline groove is formed in the lower end of the movable sealing ring, a spline is formed in the upper end of the push ring, and the spline is in interference fit with the spline groove; the lower end of the push ring is provided with a positioning cylinder for realizing circumferential fixation of the upper end of the sealing spring; the sealing spring is arranged between the spring seat and the push ring and is in a compressed state; the spring seat realizes axial positioning through the step of driving shaft, and with driving shaft fixed connection, also be equipped with the location cylinder on the spring seat, be used for realizing the circumference of seal spring lower extreme is fixed.
5. The online visual test device for hydrate generation and inhibition effect according to claim 1, wherein a fixed groove is formed in the upper half surface of the left end periphery of the right side pipe body, and a movable groove is formed in the upper half surface of the right end periphery of the left side pipe body; the fixed baffle is fixedly connected with the fixed groove through a screw; the left side surface of the movable groove is flush with the bottom end of the large bevel gear, and the right side surface of the movable groove is flush with the left side of the fan blade on the movable baffle; the left side face of the fixed groove is flush with the right side of the fan blade II on the fixed baffle, and the right side face of the fixed groove is flush with the right end face of the fixed baffle.
6. The on-line visual test device for hydrate formation and inhibition effect according to claim 1, wherein the inhibitor injection system comprises an injection agent cylinder, an injection pump, a flow valve, an injection pump switch and an injection pressure gauge;
the injection agent cylinder is communicated with the injection pump through a first pipeline; the circulating valve is arranged on the first pipeline and used for controlling the circulation of fluid in the first pipeline; the liquid injection pump is electrically connected with the liquid injection pump switch, and the liquid injection pump is connected with the liquid injection valve through a second pipeline; the injection pressure gauge is used for monitoring the pressure of the fluid after the fluid flows out of the injection pump.
7. The on-line visual test device for hydrate generation and inhibition effect according to claim 1, wherein the visual kettle body comprises a reaction kettle outer cylinder, a sapphire inner cylinder, a flange seat, a thermometer, a liquid inlet and a liquid outlet;
a flange seat is fixedly welded at the outer sides of two ends of the outer cylinder of the reaction kettle respectively; pre-metallizing the outer surface of the sapphire inner cylinder to obtain a pre-metallized band, and fixing the pre-metallized band and the flange seat by brazing with brazing filler metal; the upper part of the outer barrel of the reaction kettle is provided with a thermometer, the side surface of the outer barrel is provided with a visual window seat, a visual window cover and a sealing ring, and the visual window cover is fixedly connected with the visual window seat through a screw; a groove is formed in the visible window seat and used for placing the sealing ring; a sapphire window is embedded in the visible window cover; the same axis of the outer cylinder of the reaction kettle is respectively provided with the liquid inlet and the liquid outlet.
8. The hydrate formation and inhibition effect online visualization test equipment according to claim 7, wherein the data acquisition system comprises a high-speed camera, a camera base, a positioning rod and the imaging controller;
the side edge of the camera seat is provided with a ring groove, and the upper surface of the camera seat is provided with a plurality of limit grooves along the trend of the ring groove; the positioning seat is in an inverted U shape and is arranged above the camera seat; the bottom of the high-speed camera is provided with an external thread column, and the external thread column is connected with an internal thread hole in the middle of the top end of the positioning seat in a matched manner, so that the high-speed camera is connected to the camera seat; the camera of the high-speed camera is aligned with the sapphire window, and meanwhile, the high-speed camera is electrically connected with the imaging controller to transmit information; the top end of the positioning seat is also provided with a fulcrum groove, the positioning rod comprises a limit cylinder, a semicircular fulcrum and a spring groove, the semicircular fulcrum is tightly attached in the fulcrum groove, one end of the semicircular fulcrum is connected with the limit cylinder, and the other end of the semicircular fulcrum is connected with the spring; the limiting cylinder vertically penetrates through the top surface of the positioning seat and can extend into the limiting groove below the positioning seat, so that the positions of the high-speed cameras with different angles are fixed; the bottom surface of the corresponding end of the semicircular fulcrum is provided with the spring groove, the top end of the spring is fixed in the spring groove, and the bottom end of the spring is fixedly connected with the upper surface of the positioning seat; the two sides of the semicircular fulcrum are restrained from displacing on a vertical plane by a positioning stud, a positioning base with a positioning hole and a nut which are rotationally connected with the semicircular fulcrum; and a plurality of rollers fixed by nuts and roller rods are arranged on two sides of the positioning seat, and the outer sides of the rollers are tangent with the inner sides of the annular grooves.
9. The on-line visual test device for hydrate formation and inhibition effect according to claim 7, wherein the temperature control system comprises a liquid storage tank, a liquid storage valve, a circulating pump, a throttle valve, a condenser, a compression pump, a heater, a liquid outlet valve and a liquid inlet valve;
the transparent heat conduction liquid is filled in the liquid storage tank, and the liquid storage tank is in threaded sealing connection with the liquid storage valve; the circulating pump is of a three-way structure, and the liquid outlet valve, the circulating pump, the throttle valve, the condenser, the compression pump, the heater and the liquid inlet valve are sequentially connected through a pipeline III; the liquid storage valve is connected with the circulating pump through a pipeline IV; the liquid inlet valve is in threaded sealing connection with the liquid inlet hole, and the liquid outlet valve is in threaded sealing connection with the liquid outlet hole.
10. An online visual test method for hydrate generation and inhibition effect, which is characterized by adopting the online visual test equipment for hydrate generation and inhibition effect according to any one of claims 1-9, comprising the following steps:
step one, completing the assembly of hydrate generation and inhibition effect online visual test equipment on site, and detecting whether each device works normally or not and whether a pipeline leaks or not;
Step two, starting a stepping motor through the imaging controller, and closing the stepping motor when the angle of the rotation angle sensor transmitted back to the imaging controller reaches a test value, so that the fluid flow area of the movable baffle plate and the fixed baffle plate after being matched can be calculated, and the fluid flow area is consistent with the test requirement; if the well opening and closing process is required to be simulated, the stepping motor is kept in an opening state, so that the fluid flow area of the movable baffle plate and the fixed baffle plate after being matched is in dynamic change, otherwise, the step is omitted;
step three, injecting the hydrate inhibitor to be tested into the visual kettle body through an inhibitor injection system;
step four, if the pressure drop change after the hydrate inhibitor is added is required to be evaluated, simultaneously closing a front butterfly valve and a rear butterfly valve, filling nitrogen into the inhibitor injection system, and recording the pressure value change in the left pipe body through a pressure gauge, otherwise, neglecting the step;
step five, starting devices of each part of the temperature control system to regulate and control the temperature, so that the temperature display result is consistent with the test requirement;
step six, controlling the shooting angle of the high-speed camera through a data acquisition system;
step seven, collecting experimental data, and recording the angle shown by the rotation angle sensor and the change relation of temperature and pressure along with time; recording the shooting angle of a high-speed camera, and monitoring the generation condition of natural gas hydrate in the visual kettle body in real time through the high-speed camera to obtain a dynamic process of the change of the form of the hydrate along with time;
Step eight, regulating and controlling the stepping motor through the imaging controller, enabling the movable baffle plate to be completely overlapped with the first fan blade and the second fan blade of the fixed baffle plate, opening the front butterfly valve and the rear butterfly valve, closing each device in the temperature control system and the data acquisition system, and completing the field test process of the hydrate inhibitor.
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