CN114486992A - High water content dissolved gas crude oil wall-sticking temperature testing device - Google Patents
High water content dissolved gas crude oil wall-sticking temperature testing device Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000010779 crude oil Substances 0.000 title claims abstract description 70
- 238000012360 testing method Methods 0.000 title claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 109
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- 238000009991 scouring Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 31
- 239000000523 sample Substances 0.000 claims description 27
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Abstract
The invention provides a wall-sticking temperature testing device for crude oil with high water content and dissolved gas, which comprises a reaction kettle, a stirring system, a monitoring system, a temperature control system, a pressurization system and an image acquisition system, wherein the reaction kettle is used for placing the crude oil with high water content and dissolved gas with the same water content as that of a test site to simulate an actual pipeline, the temperature control system and the pressurization system simulate the operating condition of the pipeline by controlling and pressurizing the reaction kettle respectively, the stirring system is provided with a spiral ribbon screw type stirring structure and is arranged in the reaction kettle to stir to simulate a pipe flow scouring shearing process, the monitoring system acquires and monitors the pressure, the temperature and the wall surface condensed oil stress in the reaction kettle, the image acquisition system acquires the image of the pipe inner diameter change condition caused by the crude oil sticking to the wall after the stirring process of the stirring system is finished, and the change condition of the wall-sticking process of the crude oil under different conditions of dissolved gas pressure, water content, shearing condition and temperature can be tested, thereby accurately determining the wall sticking temperature of the crude oil with high water content and dissolved gas.
Description
Technical Field
The invention relates to an experimental simulation test device, in particular to a wall sticking temperature test device for high water content dissolved gas crude oil.
Background
The development process of the oil field is divided into four stages according to the change of the water content, namely a low water content stage (the water content is less than or equal to 20%), a medium water content stage (the water content is more than 20% and less than or equal to 60%), a high water content stage (the water content is more than 60% and less than or equal to 90%) and an extra-high water content stage (the water content is more than 90%). At present, each large oil field in China enters the later stage of high water content development in succession, and the water content of produced liquid is as high as more than 85%. As is known, most of crude oil produced in China is 'three-high' crude oil, and in order to improve the flowing characteristic of the crude oil, a heating or heat tracing gathering and transportation process is generally adopted in the prior art. Because the specific heat capacity of water is about 2 times of that of crude oil, the heating energy consumption of the gathering system is rapidly increased along with the increase of the water content. If the heating gathering and transportation process is continuously adopted in the high water content period, most of the output heat can be used for heating produced water, and huge energy waste is caused. On the other hand, the low-temperature flowing characteristic of the crude oil is improved due to the increase of the water content, and even if the gathering and transportation temperature is lower than the condensation point of the crude oil, safe oil return can be still realized under the driving of flushing of produced water, so that favorable conditions are created for the development of oil collection without heating. In the process of conveying high-water-content crude oil, along with the reduction of the gathering and conveying temperature, when the gathering and conveying temperature is lower than the wall sticking temperature of the crude oil, the shearing action of the produced water on the crude oil is not enough to overcome the adhesion action between the crude oil and the interface of the inner wall of the pipeline, a large amount of crude oil adheres to the inner wall of the pipeline, the flow area of the pipeline is reduced, the flow resistance of the crude oil is increased, the gathering and conveying cost is increased, the pipeline can be even blocked in serious conditions, and the normal production and operation of an oil field are influenced. The crude oil wall sticking temperature is the corresponding temperature when the pipe wall condensed oil quality begins to rapidly increase along with the reduction of the oil collecting temperature, so that the pipeline pressure rapidly rises. Therefore, in order to ensure the smooth operation of the gathering and transportation system while saving the oil collecting cost, the temperature boundary condition of safe oil return of the oil collecting pipeline can be established by measuring the wall sticking temperature of the crude oil with high water content.
In order to realize cost reduction and efficiency improvement and construct low-carbon oil fields, a non-heating gathering and transportation process is urgently needed to be popularized in each large oil field. At present, a trial cooling mode is usually adopted on an oil field, the concept and guidance for how much the gathering and transportation temperature can be reduced are lacked, and if the temperature is too low, the back pressure of a wellhead is easily increased, so that the pipe blockage accident is caused. Chinese utility model patent CN208091955U discloses an experimental apparatus for measure gathering pipeline in the double-phase wall temperature that glues of profit, the device install on the actual production pipeline at scene, the double-phase mobile form and the actual comparatively identical in the scene of profit in the experiment pipeline, use the wall temperature that glues of the device survey to have certain guiding meaning to actual production. However, the experimental result of the patent is only applicable to oil-water two phases, while the development product of an actual oil field system is often accompanied by a large amount of associated gas, and most of the crude oil flowing in the gathering and transportation pipeline is dissolved gas crude oil. Therefore, in order to research the influence of dissolved gas on the wall adhesion and reduce the oil collection temperature to the maximum extent on the premise of ensuring safety, it is necessary to research the wall adhesion rule of the high-water-content dissolved gas crude oil, and make a wall adhesion temperature test method for the high-water-content dissolved gas crude oil, so as to provide a basis for development of oil field non-heating gathering and transportation.
As can be seen from the background research, no indoor testing device related to the wall sticking rule of the high-water-content gas-dissolved crude oil exists at present. Therefore, it is necessary to develop and design a set of precise and easy-to-operate small experimental device and a convenient and fast experimental method for use in cooperation with the device to effectively measure the wall-sticking temperature of the high-water-content dissolved gas crude oil.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a wall sticking temperature testing device for high water content gas-dissolved crude oil, which can test the change condition of the wall sticking process of the crude oil under different gas-dissolved pressures, water contents, shearing conditions and temperature conditions, thereby accurately determining the wall sticking temperature of the high water content gas-dissolved crude oil.
The technical scheme of the invention is as follows:
a wall-sticking temperature testing device for high-water-content dissolved gas crude oil is characterized by comprising a reaction kettle, a stirring system, a monitoring system, a temperature control system, a pressurization system and an image acquisition system, the reaction kettle is used for placing high-water-content dissolved gas crude oil with the same water content as that of a test field to simulate an actual pipeline, the temperature control system and the pressurization system simulate the pipeline operation condition by controlling and pressurizing the temperature of the reaction kettle respectively, the stirring system is provided with a helical ribbon screw type stirring structure, the pipe flow scouring and shearing process is simulated by arranging the helical ribbon screw type stirring structure in the reaction kettle for stirring, the monitoring system collects and monitors the pressure, the temperature and the wall surface oil condensation stress in the reaction kettle, and after the stirring process of the stirring system is finished, image acquisition is carried out on the change condition of the inner diameter of the pipe caused by the wall sticking of the crude oil through the image acquisition system, so that the wall sticking temperature of the crude oil with high water content and dissolved gas is determined.
Preferably, the main body of the reaction kettle is a seamless water sleeve of 304 stainless steel, two ends of the reaction kettle are sealed in a flange mode, and an O-shaped rubber gasket is arranged between the flange and the water sleeve for sealing; the reation kettle upside is equipped with the liquid feeding entry, and the cooperation hinge adopts the outside to pull open the form and opens the inlet valve, closes the back and fixes with the bolt form, and fixed direction is the radial direction of water jacket pipe, and the reation kettle downside is equipped with a drain pipe export, is equipped with a ball valve in flowing back pipe end point department.
Preferably, the stirring system comprises an electric stirrer, a helical ribbon screw type stirring structure and a displacement driver, wherein the electric stirrer is axially placed along the reaction kettle and fixed on the displacement driver, and the displacement driver adopts an inductive displacement sensor to cooperate with a sliding block in the moving tank to control the position of the electric stirrer; the helical ribbon screw type stirring structure comprises helical ribbon blades, a stirring rod, screw blades and radial fixing rods, wherein the helical ribbon blades surround at the end points of the radial fixing rods in a concentric circle mode by using axial visual angles, the screw blades surround on the stirring rod in a concentric circle mode by using the radial fixing rods at two ends as starting points and using the axial visual angles, and the paddle-free ends of the stirring rod are arranged in the electric stirrer to be fixed after being connected through a flange at the inlet end of the reaction kettle in a mechanical sealing mode, so that the axis of the helical ribbon screw type stirring structure coincides with the axis of the reaction kettle.
Preferably, an electric stirrer of the stirring system is axially placed on and fixed with a moving groove sliding block of a displacement driver along the reaction kettle, and the rotating speed is regulated by a rotating speed regulator within the range of 0-1000 r/min; the helical ribbon screw type stirring structure is made of 304 stainless steel, the number of helical ribbon blades is two, the helical ribbon blades are arranged on the stirring rod in a surrounding mode for 10-15 circles, and the blade-free end of the stirring rod is mechanically sealed and connected through a flange at the inlet end of the reaction kettle and then is placed into a holder of the electric stirrer to be fixed; the displacement driver comprises a support, a sensor and a slip stop block, the sensor adopts an inductive displacement sensor to be matched with a sliding block in a moving groove to control the position of the electric stirrer, and the slip stop block is an inclined plane right-angled triangle metal block and is matched with the sliding block in the moving groove to fix the position of the electric stirrer by using a self-locking structure.
Preferably, the monitoring system comprises a data acquisition module and a control box, the data acquisition module comprises a pressure sensor, a temperature sensor and a stress test piece, and a probe of the pressure sensor is arranged on the inner side of a flange at the inlet end of the reaction kettle and is connected to the control box through the pressure sensor; a probe of the temperature sensor is arranged on the inner side of a flange at the inlet end of the reaction kettle and is connected to the control box through a data line of the temperature sensor; the stress test pieces are arranged on the circumference of the reaction kettle at the same axial distance from the inlet end, a plurality of stress test pieces are arranged anticlockwise from the lowest point of the cross section of the tube, and the stress test pieces are connected in parallel through stress test piece data lines and then connected to the control box; the control box comprises a display panel and a control switch, wherein the display panel is used for displaying real-time pressure, temperature and stress change of the test piece in the reaction kettle.
Preferably, the temperature control system adopts SDC-6 type temperature control water bath and is connected to a water jacket interlayer of the reaction kettle through a PVC hose, so that the temperature in the reaction kettle is controlled.
Preferably, the pressurization system adopts a high-pressure gas cylinder for supplying pressure up to 5MPa, a high-pressure gas pipeline is connected into the reaction kettle through an outlet valve, and a gas outlet of the pipeline is positioned on the inner side of the inlet end flange.
Preferably, the image acquisition system comprises a light source, image acquisition equipment and display equipment, flanges at two ends of the reaction kettle are opened after the stirring process of the stirring system is finished, the inner diameter of the seamless water jacket pipe of the reaction kettle is irradiated by the light source arranged at the inlet end of the reaction kettle, and the image acquisition equipment arranged at the outlet end of the reaction kettle acquires the change situation of the inner diameter of the pipe caused by crude oil sticking to the wall and displays the change situation in real time by the display equipment.
Preferably, the light source adopts an annular lamp, the image acquisition equipment is a charge coupler module, the annular lamp is fixed on a sliding block of the displacement driver, the charge coupler module comprises a charge coupler and a convex lens, and the position of the center point of the image surface of the charge coupler is coincident with the axis of the reaction kettle; the light irradiated by the annular lamp is refracted by the convex lens to be imaged on the image surface of the charge coupler, the optical signal is converted into an electric signal, and the electric signal is transmitted to the display equipment by the data transmission line to display image change in real time.
The invention has the beneficial effects that:
the invention provides a wall-sticking temperature testing device for crude oil with high water content and dissolved gas, which is characterized by comprising a reaction kettle, a stirring system, a monitoring system, a temperature control system, a pressurization system and an image acquisition system, wherein the reaction kettle can simulate an actual pipeline, the operation condition of the pipeline is simulated by matching with the temperature control system and the pressurization system, the pipe flow scouring shearing process is simulated by stirring through a helical ribbon screw type stirring structure of the stirring system, the pressure, the temperature and the wall surface condensed oil stress in the reaction kettle can be collected and monitored by the monitoring system, the image acquisition system carries out image acquisition on the pipe inner diameter change condition caused by the wall sticking of the crude oil after the stirring process of the stirring system is finished, so that the wall-sticking temperature of the crude oil with high water content and dissolved gas can be accurately determined, the device can carry out flow simulation test on the pipelines under the conditions of different water contents, different dissolved gas pressures and different pipe flow shearing conditions, meanwhile, the monitoring system can realize real-time monitoring of temperature, pressure and wall surface stress change in the reaction kettle and grasp the working condition development at different moments; the image acquisition system who is equipped with can carry out image acquisition to the pipe wall face oil condensation condition under the different conditions, has solved the unable problem of observing the inside operating mode of gathering and transportation pipeline and has avoided adopting the adhesion property change that the pipeline material difference that transparent glass pipeline leads to arouses again. The testing device is not limited by time and space, the testing process is convenient and fast, the working condition of the pipeline can be truly reflected, the reliability is high, and a basis is provided for development of oil field non-heating gathering and transportation.
Preferably, the reaction kettle main body is a seamless water sleeve made of 304 stainless steel; the two ends of the reaction kettle are sealed by flanges, and can be further fixed by bolts matched with O-shaped rubber gaskets, so that the sealing property is ensured; the upper side of the reaction kettle is provided with a liquid feeding inlet, so that an oil sample and a water sample required for testing are added, an inlet valve is opened in a mode of pulling outwards in cooperation with a hinge, and the inlet valve is fixed in a bolt mode after being closed, so that the sample loading process is convenient and rapid, and meanwhile, the sealing performance is ensured; a reducing liquid discharge pipe is arranged at the lower side of the reaction kettle, and a ball valve is arranged at the end point, so that the sample can be conveniently and quickly discharged, and the sealing performance is ensured; furthermore, the outside downside of reation kettle can also be equipped with two rubber support, can slow down the stirring vibrations influence, noise reduction.
Preferably, the stirring system comprises an electric stirrer, a helical ribbon screw type stirring structure and a displacement driver. The electric stirrer is arranged on the displacement driver moving groove along the axial direction of the water jacket furnace and fixed with the sliding block, and the flow conditions under different shearing conditions can be simulated by the rotating speed range of the electric stirrer being 0-1000 r/min. The screw belt screw type stirring structure is made of 304 stainless steel, and the paddle-free end of the stirring rod is mechanically sealed and connected through an inlet end flange and then is placed into the electric stirrer for fixing, so that the axis of the screw belt screw type stirring structure is ensured to be coincident with the axis of the reaction kettle; the propeller blade can provide power to realize axial flow of the sample on the wall surface; the paddle of the screw rod part can realize that the sample at the center returns along the axial direction, so that the repeated flowing of the sample is ensured, and the formed wall surface condensed oil is not damaged. The displacement driver preferably comprises a support, a sensor and a non-slip block, and the sensor adopts an inductive displacement sensor to be matched with a sliding block of the moving groove to accurately control the position of the electric stirrer; the anti-slip block is an inclined plane right-angled triangle metal block which can be matched with the slide block in the moving groove to fix the position of the electric stirrer by utilizing the self-locking principle.
The monitoring system preferably comprises a data acquisition module and a control box. The data acquisition module is provided with a pressure sensor, a temperature sensor and a pressure test piece, a pressure sensor probe and a temperature sensor probe are arranged on the inner side of the inlet end flange, and a data transmission line is connected to the control box through the probes; the stress test pieces can be provided with a plurality of pieces, and are further preferably 3 in total, the stress test pieces are arranged on the circumference of the reaction kettle at the same axial distance from the inlet end, the lowest point of the cross section of the pipe is in the anticlockwise direction, for example, the stress test pieces are respectively positioned in the directions of 6 o ' clock, 3 o ' clock and 12 o ' clock, the real-time monitoring on the adhesive force of the congealed oil at different positions in the pipe can be realized, and the data transmission lines are connected to the control box after being connected in parallel through the probes. The probe is placed in the kettle in a thread sealing mode and is bonded on the inner wall surface of the kettle through an adhesive, so that the sealing performance and the firmness are ensured. The control box comprises a display panel and a control switch, wherein the display panel can be three LED display panels for example, and the three LED display panels respectively display real-time pressure, temperature and stress change of the test piece in the reaction kettle, so that the display is visual and clear.
Preferably, the temperature control system is a SDC-6 type constant temperature water bath, and is connected to a water jacket interlayer (or called as a water jacket inlet/outlet and a water jacket joint) of the reaction kettle through a PVC hose, so that the temperature in the reaction kettle can be accurately controlled.
Preferably, the pressurization system is a high-pressure gas cylinder, and the high-pressure gas pipeline is connected into the reaction kettle through an outlet valve, so that the highest pressure of 5MPa can be provided, and sufficient pressure and gas source can be ensured; meanwhile, a one-way check valve is arranged to realize fine adjustment of pressure.
Preferably, the image acquisition system comprises a light source, an image acquisition device and a display device, and further preferably comprises a ring lamp, a charge coupled device module and a display device. The annular lamp support is fixed on the sliding block of the displacement driver, so that the accurate movement of the light source position can be realized; the charge coupler module comprises a charge coupler, a convex lens and a support, the charge coupler module is fixed at the outlet end of the reaction kettle, and the position of the image surface center point of the charge coupler coincides with the axis of the reaction kettle; the annular lamp shines light and refracts the formation of image on charge coupler image plane through convex lens, turns into the light signal for the signal of telecommunication, shows image change in real time on data transmission line conveys the signal of telecommunication to display device, can intercept, contrast the processing to the image simultaneously, convenient and fast.
Drawings
FIG. 1 is a block diagram of the structure of the wall-sticking temperature testing device for crude oil with high water content and dissolved gas.
FIG. 2 is a schematic diagram of a preferred structure of the wall sticking temperature testing device for crude oil with high water content and dissolved gas.
The various reference numbers in the figures are listed below:
1-a reaction kettle; 2, a flange; 3-O-type rubber gasket; 4-M6.0 type bolt; 5-a drain pipe; 6-liquid discharge pipe; 7-ball valve; 8, a rubber support; 9-helical ribbon paddle; 10-radial fixation rod; 11-screw blade; 12-a stirring rod; 13-inlet fixing bolt; 14-inlet valve; 15-liquid feeding inlet of the reaction kettle; 16-stress test piece; 17-temperature sensor data line; 18-pressure sensor data line; 19-high pressure gas inlet; 20-stress test piece data line; 21-high pressure gas line; 22-a temperature sensor; 23-a pressure sensor; 24-temperature display screen; 25-pressure display screen; 26-stress display screen; 27-control box switch; 28-control box; 29-PVC hose; 30-temperature-controlled water bath; 31-a high-pressure gas cylinder; 32-electric stirrer; 33-electric stirrer switch; 34-rotating speed display screen; 35-a rubber support; 36-moving the slot slider; 37-anti-slip blocks; 38-displacement actuator; 39-ring lamp; 40-a charge coupler; 41-convex lens; 42-a support; 43 — a data transmission line; 44-display device.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.
The invention relates to a wall-sticking temperature testing device for crude oil with high water content and dissolved gas, which comprises a reaction kettle, a stirring system, a monitoring system, a temperature control system, a pressurization system and an image acquisition system as shown in a structural block diagram of figure 1, wherein the reaction kettle is used for placing the crude oil with high water content and dissolved gas with the same water content as that of a test site to simulate an actual pipeline, the temperature control system and the pressurization system simulate the operating condition of the pipeline by controlling and pressurizing the temperature of the reaction kettle respectively, the stirring system is provided with a helical ribbon screw type stirring structure, the helical ribbon screw type stirring structure is arranged in the reaction kettle to be stirred to simulate a pipe flow scouring shearing process, the monitoring system acquires and monitors the pressure, the temperature and the wall surface condensed oil stress in the reaction kettle, and the image acquisition system acquires the image of the change condition of the inner diameter of a pipe caused by the wall sticking of the crude oil after the stirring process of the stirring system is finished, thereby determining the wall sticking temperature of the high water-containing gas-dissolved crude oil. The device can realize the simulation of defeated condition under different moisture content, different dissolved gas pressure and different flow states, obtains the pipe wall condensation oil condition under the defeated temperature condition of different collection through the stirring test to judge the boundary of defeated temperature of collection, can ensure the safe operation of defeated pipeline of collection when defeated temperature of collection is higher than this temperature. Overall, the device has the advantage that scientificity, maneuverability and practicality are strong, has wide application prospect.
The following describes each component of the device for testing the wall sticking temperature of the high water content gas-dissolved crude oil according to the present invention in detail, as shown in fig. 2, fig. 2 is a schematic view of a preferred structure of the device for testing the wall sticking temperature of the high water content gas-dissolved crude oil according to the present invention. The reactor comprises a reaction kettle 1, wherein a seamless water sleeve pipe with the outer diameter of 170mm, the inner diameter of 120mm, the wall thickness of 3mm and the axial length of 400mm is preferably selected as a main body of the reaction kettle 1, and the material is 304 stainless steel to ensure corrosion resistance. The two ends of the reaction kettle 1 are sealed by flanges 2, the thickness of the flanges is 15mm, four M6.0 type bolts 4 are arranged at intervals of 90 degrees, the distance between the center position and the edge of the flange 2 is 12mm, and the flange 2 and the reaction kettle 1 are sealed by an O-shaped rubber gasket 3, so that the stability and the air tightness can be ensured. The internal diameter of reation kettle liquid feeding entry 15 is 50mm, adopts the welded form after the cutting, and the welding has an entry valve 14 above, and one side welding has the hinge to open and close and carry out sealed fixed by entry fixing bolt 13, can ensure the convenience of liquid feeding process and the gas tightness of experimentation. The lower side of the reaction kettle 1 is also externally connected with a liquid discharge pipe 5 and a liquid discharge pipe 6 in a welding mode after cutting, the inner diameter of the liquid discharge pipe 5 is 50mm, the wall thickness is 3mm, the axial length is 30mm, the inner diameter of the liquid discharge pipe 6 is 20mm, the wall thickness is 3mm, the axial length is 150mm, and a ball valve 7 is welded at the end point of the liquid discharge pipe 6. Two rubber supports 8 are bonded on the lower side of the outside of the reaction kettle 1 by an adhesive, the length is 50mm, the width is 50mm, and the height is 30 mm.
Specifically, the stirring system comprises an electric stirrer 32, a helical ribbon screw type stirring structure and a displacement driver 38, wherein the helical ribbon screw type stirring structure comprises helical ribbon blades 9, stirring rods 12, screw blades 11 and radial fixing rods 10. The displacement actuator 38 is controlled by an inductive displacement transducer, which is provided with a small motor and switch. The electric stirrer 32 is placed on the moving slot slider 36 of the displacement driver 38 along the axial direction of the reaction vessel 1, and the two are fixed by plugging, and the anti-slip block 37 is fixed at the rear end of the electric stirrer 32 to ensure the stability in the axial direction. The electric stirrer switch 33 is turned on and rotates clockwise, and the rotating speed of the stirring paddle can be displayed on the rotating speed display 34, wherein the rotating speed range is 0-1000 r/min. All parts of the helical ribbon screw type stirring structure are connected in a spot welding mode, and the diameter of the stirring rod 12 is 12mm, and the length of the stirring rod is 600 mm; the diameter of each radial fixing rod 10 is 12mm, the length of each radial fixing rod is 80mm, and the interval is 170 mm; the width of the helical ribbon paddle 9 is 10mm, and the helical ribbon paddle is surrounded at the end point of the radial fixed rod in a manner of taking an axial visual angle as a concentric circle, and the total number of the helical ribbon paddle is two; the width of the screw blade 11 is 10mm, radial fixed rods at two ends are used as starting points, and the screw blade is surrounded on the stirring rod in a concentric circle mode in an axial view, and preferably 12 circles. The paddle-free end of the stirring rod 12 passes through the inlet end flange 2, is connected in a mechanical sealing mode and then is placed into a holder of the electric stirrer 32 for fixing, and the axis of the helical ribbon screw type stirring structure is ensured to have the axis of the water sleeve to coincide. The displacement driver 38 mainly comprises a support, a sensor and a non-slip block, wherein the support is two rubber pads with the length of 50mm, the width of 50mm and the height of 60 mm; the sensor adopts an inductive displacement sensor to be matched with the moving groove sliding block 36 to accurately control the position of the electric stirrer 32; the anti-slip block 37 is an inclined right-angled triangle metal block with a height of 25mm, and is matched with the moving groove slide block 36 to fix the position of the electric stirrer 32 by a self-locking structure.
The monitoring system comprises a data acquisition module and a control box 28, the data acquisition module comprises a temperature sensor 22, a pressure sensor 23 and a stress test piece 16, a probe of the pressure sensor 23 is arranged on the inner side of the inlet end flange 2 in a threaded connection mode and is fixed in an adhesive bonding mode, and a data line 18 of the pressure sensor is connected to the control box 28 through the probe; the probe of the temperature sensor 22 is arranged on the inner side of the inlet end flange 2 in a threaded connection mode, and a temperature sensor data line 17 is connected to a control box 28 through the probe; the stress test pieces 16 are 3 in number, are arranged on the circumference of the reaction kettle 1 at the same axial distance from the inlet end flange 2 in a threaded connection mode, are fixed in an adhesive bonding mode, are arranged in the mode that the lowest point of the cross section of the pipe is arranged anticlockwise and are respectively positioned in the directions of 6 o ' clock, 3 o ' clock and 12 o ' clock, and the stress test piece data lines 20 are connected to the control box 28 after being connected in parallel outside the reaction kettle 1. And (3) starting a control box switch 27, and observing the working condition change in the reaction kettle 1 in real time through a temperature display screen 24, a pressure display screen 25 and a stress display screen 26.
The model of a temperature control water bath 30 in the temperature control system is SDC-6, deionized water is added into the water bath, the temperature of the water bath is adjusted by a touch screen button, and the temperature control water bath is connected to an inlet and an outlet of a water jacket of the reaction kettle 1 through a PVC hose 29, so that the temperature in the reaction kettle 1 is accurately controlled.
The high-pressure gas cylinder 31 in the pressurization system can provide the highest pressure of 5MPa, and meanwhile, the high-pressure gas cylinder 31 is provided with a one-way check valve which can finely adjust the pressure. The high-pressure gas pipeline 21 is connected into the reaction kettle 1 through a one-way check valve, and the high-pressure gas inlet 19 is arranged on the inner side of the inlet end flange 2 in a threaded connection mode.
The image acquisition system of this embodiment comprises an annular lamp 39, a ccd module and a display 44, the ccd module in turn mainly consisting of a convex lens 41 and a ccd 40. Before image acquisition, the sample in the reaction kettle 1 needs to be discharged by self-flow under stirring conditions, and the flange 2 and the electric stirrer need to be removed at the same time. In the same way as the electric stirrer 32 is fixed, the holder 42 of the annular lamp is fixed in a plug-in manner to the moving channel slide 36 of the displacement drive 38. The charge coupler module is arranged at the outlet end of the reaction kettle 1 to ensure that the position of the central point of the charge coupler 40 is coincident with the axis of the reaction kettle 1; the same principle as the camera imaging principle, the light irradiated by the annular lamp 39 is refracted by the convex lens 41 to be imaged on the charge coupler 40, the optical signal is converted into an electric signal, the electric signal is transmitted to a computer through the data transmission line 43, and the image change is displayed on the display 44 in real time, namely the pipe diameter change condition under different working conditions is obtained.
The invention relates to a wall-sticking temperature testing device for high-water-content dissolved gas crude oil, which simulates the flowing state of a crude oil gathering and transportation pipeline through a reaction kettle, a stirring system, a temperature control system and a pressurization system so as to monitor the reaction condensate oil of the system and an image acquisition system, the acting force change of the pipe wall and the pipe diameter change condition, and the device can specifically execute the following steps when in work:
s1, sample preparation: testing the actual emulsified water content of the crude oil on site, dehydrating and thermally treating the crude oil taken from the site, and preparing a crude oil emulsion with the same emulsified water content;
s2, respectively putting the prepared crude oil emulsion and the prepared deionized water sample into a closed frosted bottle and placing the frosted bottle and the deionized water sample into a temperature-controlled water bath 30 for later use;
s3, fixing flanges 2 on two sides of a reaction kettle 1 by using bolts 4, and confirming closing of an outlet ball valve 7 of a liquid discharge pipe 6 on the lower side of the reaction kettle 1;
s4, starting the SDC-6 type temperature control water bath 30 of the temperature control system and setting the initial temperature, and setting the same initial sample loading temperature for the same group of experiments;
s5, starting the control box 28 of the monitoring system, and observing the indication changes of the temperature display screen 24 and the pressure display screen 25;
s6, when the temperature of the temperature-controlled water bath 30 reaches a set value, adding the standby emulsion and water from the liquid adding inlet 15 of the reaction kettle in proportion, and then closing the inlet valve 14, wherein the total volume of oil and water is 1.5L-4.5L, and the specific volume of oil and water is determined according to the actual pipeline flow conditions;
s7, connecting the electric stirrer 32 with a helical ribbon screw type stirring structure through a flange 2 at the inlet end of the reaction kettle 1, sealing and fixing, starting a displacement driver 38 to adjust the axial position of the electric stirrer, so that the helical ribbon screw type stirring structure is positioned at the central position of the reaction kettle 1, the radial fixing rods 10 at two ends are equal in distance to the flanges 2 at two sides, and installing a non-slip block 37 to fix the position of the electric stirrer 32;
s8, calculating the wall shear force according to the actual flowing state of the pipeline, and setting the rotating speed of the helical ribbon screw type stirring structure according to the principle that the shearing conditions are kept consistent;
s9, opening a valve of a high-pressure gas cylinder 31 of the pressurization system and an inlet valve 14 of the reaction kettle, replacing air in the reaction kettle 1 for 2 minutes, closing the inlet valve 14 of the reaction kettle after replacement is finished, and adjusting the pressure value in the reaction kettle 1 to reach an experimental set value;
s10, starting the electric stirrer 32, reducing the temperature of the temperature-controlled water bath 30 to the set value of the experiment, stirring for 10 minutes after the temperature is reduced to be constant according to the set rotating speed, and simultaneously recording the real-time data of the stress display screen 25 on the control box 28;
s11, when stirring for 10 minutes, loosening the fixing bolt 13 at the inlet of the reaction kettle, and gradually releasing the pressure in the kettle until the display screen 25 of the pressure in the control box shows that the display number is 0;
s12, opening a ball valve 7 at the lower side of the reaction kettle 1, and connecting an oil-water sample into a beaker;
s13, closing the electric stirrer 32 and moving away, and opening the flanges 2 at the two sides of the reaction kettle 1;
s14, mounting the annular lamp support 42 on the moving slot slide block 36 of the displacement driver 38 and fixing, placing the charge coupler module at the outlet end of the reaction kettle 1, coinciding the center point position of the charge coupler 40 with the axis of the reaction kettle 1, displaying and storing the image on the display 44 through the data transmission line 43;
s15, continuing to reduce the set temperature of the experiment, repeating the steps S3 to S14 until the cross section image of the pipeline begins to obviously reduce, and determining the wall sticking temperature of the crude oil sample under the comprehensive water content;
s16, cleaning the reaction kettle 1, and finishing the experiment.
It should be noted that the above steps are only preferred embodiments of the wall sticking temperature testing apparatus for high water content gas-dissolved crude oil of the present invention, and not exclusive embodiments, and one of the pressure, temperature and shear force (stress) may be changed during each test. After the stirring of at every turn test, close the electric agitator and remove, open reation kettle both sides flange, shine through reation kettle entry end by the annular lamp, at reation kettle exit end charge-coupled ware department formation of image, the crude oil glues the wall and leads to shining formation of image time shadow, and the inside pipe diameter change condition that leads to is glued to the crude oil to this shadow corresponds the tubular diameter change condition of wall and leading to through display device real-time display, can calculate according to the formation of image shadow and can acquire the tube wall face oil condensate layer distribution condition.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments, which may be included within the spirit and scope of the invention. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (9)
1. A wall-sticking temperature testing device for high-water-content dissolved gas crude oil is characterized by comprising a reaction kettle, a stirring system, a monitoring system, a temperature control system, a pressurization system and an image acquisition system, the reaction kettle is used for placing high-water-content dissolved gas crude oil with the same water content as that of a test field to simulate an actual pipeline, the temperature control system and the pressurization system simulate the pipeline operation condition by controlling and pressurizing the temperature of the reaction kettle respectively, the stirring system is provided with a helical ribbon screw type stirring structure, the pipe flow scouring and shearing process is simulated by arranging the helical ribbon screw type stirring structure in the reaction kettle for stirring, the monitoring system collects and monitors the pressure, the temperature and the wall surface oil condensation stress in the reaction kettle, and after the stirring process of the stirring system is finished, image acquisition is carried out on the change condition of the inner diameter of the pipe caused by the wall sticking of the crude oil through the image acquisition system, so that the wall sticking temperature of the crude oil with high water content and dissolved gas is determined.
2. The wall sticking temperature testing device for the high water content gas-dissolved crude oil according to claim 1, wherein the main body of the reaction kettle is a seamless water sleeve of 304 stainless steel, two ends of the reaction kettle are sealed in a flange mode, and an O-shaped rubber gasket is arranged between the flange and the water sleeve for sealing; the reation kettle upside is equipped with the liquid feeding entry, and the cooperation hinge adopts the outside to pull open the form and opens the inlet valve, closes the back and fixes with the bolt form, and fixed direction is the radial direction of water jacket pipe, and the reation kettle downside is equipped with a drain pipe export, is equipped with a ball valve in flowing back pipe end point department.
3. The wall-sticking temperature testing device for crude oil with high water content and dissolved gas content as claimed in claim 2, wherein the stirring system comprises an electric stirrer, a helical ribbon screw type stirring structure and a displacement driver, the electric stirrer is axially arranged along the reaction kettle and fixed on the displacement driver, and the displacement driver adopts an inductive displacement sensor to cooperate with a sliding block in the moving tank to control the position of the electric stirrer; the helical ribbon screw type stirring structure comprises helical ribbon blades, a stirring rod, screw blades and radial fixing rods, wherein the helical ribbon blades surround at the end points of the radial fixing rods in a concentric circle mode by using axial visual angles, the screw blades surround on the stirring rod in a concentric circle mode by using the radial fixing rods at two ends as starting points and using the axial visual angles, and the paddle-free ends of the stirring rod are arranged in the electric stirrer to be fixed after being connected through a flange at the inlet end of the reaction kettle in a mechanical sealing mode, so that the axis of the helical ribbon screw type stirring structure coincides with the axis of the reaction kettle.
4. The wall sticking temperature testing device for the crude oil with high water content and dissolved gas content as claimed in claim 3, wherein the electric stirrer of the stirring system is arranged on and fixed with the movable groove slide block of the displacement driver along the axial direction of the reaction kettle, and is regulated by the rotation speed regulator, wherein the rotation speed range is 0-1000 r/min; the helical ribbon screw type stirring structure is made of 304 stainless steel, the number of helical ribbon blades is two, the helical ribbon blades are arranged on the stirring rod in a surrounding mode for 10-15 circles, and the blade-free end of the stirring rod is mechanically sealed and connected through a flange at the inlet end of the reaction kettle and then is placed into a holder of the electric stirrer to be fixed; the displacement driver comprises a support, a sensor and a slip stop block, the sensor adopts an inductive displacement sensor to be matched with a sliding block in a moving groove to control the position of the electric stirrer, and the slip stop block is an inclined plane right-angled triangle metal block and is matched with the sliding block in the moving groove to fix the position of the electric stirrer by using a self-locking structure.
5. The wall sticking temperature testing device for crude oil with high water content and dissolved gas as claimed in claim 2, wherein the monitoring system comprises a data acquisition module and a control box, the data acquisition module comprises a pressure sensor, a temperature sensor and a stress test sheet, a probe of the pressure sensor is arranged at the inner side of a flange at the inlet end of the reaction kettle and is connected to the control box through the pressure sensor; a probe of the temperature sensor is arranged on the inner side of a flange at the inlet end of the reaction kettle and is connected to the control box through a data line of the temperature sensor; the stress test pieces are arranged on the circumference of the reaction kettle at the same axial distance from the inlet end, a plurality of stress test pieces are arranged anticlockwise from the lowest point of the cross section of the tube, and the stress test pieces are connected in parallel through stress test piece data lines and then connected to the control box; the control box comprises a display panel and a control switch, wherein the display panel is used for displaying real-time pressure, temperature and stress change of the test piece in the reaction kettle.
6. The wall sticking temperature testing device for crude oil with high water content and dissolved gas as claimed in claim 2, wherein the temperature control system adopts SDC-6 type temperature control water bath, and is connected to the water jacket interlayer of the reaction kettle through a PVC hose to realize the control of the temperature in the reaction kettle.
7. The wall sticking temperature test device for crude oil with high water content and dissolved gas as claimed in claim 2, wherein the pressurization system adopts a high pressure gas cylinder with pressure up to 5MPa, the high pressure gas pipeline is connected into the reaction kettle through an outlet valve, and a pipeline gas outlet is positioned at the inner side of the inlet end flange.
8. The wall sticking temperature test device for crude oil with high water content and dissolved gas content as claimed in claim 4, wherein the image acquisition system comprises a light source, an image acquisition device and a display device, after the stirring process of the stirring system is finished, flanges at two ends of the reaction kettle are opened, the inner diameter of the seamless water jacket pipe of the reaction kettle is irradiated by the light source arranged at the inlet end of the reaction kettle, and the image acquisition device arranged at the outlet end of the reaction kettle acquires the change of the inner diameter of the pipe caused by the wall sticking of crude oil, and displays the change in the inner diameter of the pipe in real time by the display device.
9. The wall-sticking temperature testing device for crude oil with high water content and dissolved gas content as claimed in claim 8, wherein the light source is an annular lamp, the image acquisition device is a charge coupler module, the annular lamp is fixed on a slide block of a displacement driver, the charge coupler module comprises a charge coupler and a convex lens, and the position of the center point of the image surface of the charge coupler coincides with the axis of the reaction kettle; the light irradiated by the annular lamp is refracted by the convex lens to be imaged on the image surface of the charge coupler, the optical signal is converted into an electric signal, and the electric signal is transmitted to the display equipment by the data transmission line to display image change in real time.
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