Drag reducer performance testing device and testing method for oil and gas gathering and transportation

Abstract

The invention relates to the technical field of drag reducer performance testing, in particular to a drag reducer performance testing device and a testing method for oil and gas gathering and transportation, and the drag reducer performance testing device comprises a pressure supply unit, a testing pipeline and a triggering unit; a feeding port is vertically formed in the testing pipeline, fluid added with a drag reducer can be injected into the testing pipeline through the feeding port, an extrusion block is arranged on the side, close to the pressure supply unit, of the feeding port, the extrusion block is arranged in the testing pipeline in the extending direction of the testing pipeline in a sliding mode, and the extrusion block is driven by the pressure supply unit. An extraction block is arranged on one side of the extrusion block, the extraction block is arranged in the test pipeline in a sliding mode in the extension direction of the test pipeline, the extraction block is pneumatically driven, a sampling cavity is formed between the extraction block and the extrusion block, the volume of the sampling cavity is zero before testing, and when testing is needed, the extraction block moves towards the trigger unit, and the volume of the sampling cavity is gradually increased. According to the invention, the consumption of the tested fluid during testing is reduced, and the testing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of drag reducer performance testing, and in particular to a drag reducer performance testing device and a testing method for oil and gas gathering and transportation. Background Art

[0002] Drag reducer is a polymer compound that can reduce resistance. Adding drag reducer to fluid in a certain proportion during fluid transportation can increase flow rate and reduce energy consumption. Existing devices for testing the performance of drag reducers are mostly implemented through pipeline systems.

[0003] Chinese patent application CN118243870A discloses 1. A crude oil transportation drag reducer test loop test bench, comprising: an air supply pressurization system; a pressurized storage tank system, wherein the air supply pressurization system is connected to a second pipeline via a first pipeline, the second pipeline is connected to a first end of the pressurized storage tank system, the second end of the pressurized storage tank system is respectively connected to a third pipeline, the third pipeline is connected to a fourth pipeline, a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline, the fourth pipeline is connected to a first air compressor; a pipeline test system, wherein the pipeline test system comprises a first test pipe, a second test pipe and a third test pipe, the first test pipe and the second test pipe are connected to the third pipeline, the third pipeline is connected to the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline, the fourth pipeline is connected to the first air compressor; The sixth pipeline, the seventh pipeline and the eighth pipeline are connected to the first test tube, the second test tube and the third test tube respectively, and the first test tube, the second test tube and the third test tube are connected to the tenth pipeline; a liquid return circulation system; the liquid return circulation system includes a liquid return tank and a liquid return pump, the tenth pipeline is connected to the liquid return tank, the liquid return tank is connected to the liquid distribution barrel through the eleventh pipeline, the eleventh pipeline is connected to the fifth pipeline, the liquid return pump is arranged on the eleventh pipeline, the liquid return tank is connected to the second air compressor through the twelfth pipeline, and the upper end of the liquid return tank is provided with a thirteenth pipeline; a valve switching system, including a manual valve group and a solenoid valve group.

[0004] The above scheme determines the performance of the drag reducer by monitoring the flow rate of the fluid added with the drag reducer in the pipeline. However, the fluid with the drag reducer added needs to be injected into the monitoring pipeline before testing. However, the fluid that has just entered the pipeline needs to fill the pipeline first before normal testing can be carried out. This results in a large amount of fluid with the drag reducer added being wasted during the test, and cleaning is required after each test. Traditional cleaning methods cannot guarantee that the residues on the inner wall of the pipeline can be completely cleaned up. At the same time, during the process of injecting the fluid into the pipeline, the gas in the pipeline cannot be completely discharged, and the residual gas will affect the test results. Summary of the invention

[0005] In view of the above problems, a drag reducer performance testing device and a testing method for oil and gas gathering and transportation are provided. By arranging an extrusion block and an extraction block, a sampling cavity is formed between the extrusion block and the extraction block. A quantitative amount of the fluid to be tested is taken through the sampling cavity for testing, thereby reducing the consumption of the fluid to be tested during the test.

[0006] In order to solve the problems of the prior art, the present invention provides a drag reducer performance testing device, comprising a pressure supply unit, a test pipe and a trigger unit; a feed port is vertically opened on the test pipe, and a fluid added with the drag reducer can be injected into the test pipe through the feed port, an extrusion block is arranged on the side of the feed port close to the pressure supply unit, the extrusion block is slidably arranged in the test pipe along the extension direction of the test pipe, the extrusion block is driven by the pressure supply unit, an extraction block is arranged on one side of the extrusion block, the extraction block is slidably arranged in the test pipe along the extension direction of the test pipe, the extraction block is pneumatically driven, a sampling cavity is present between the extraction block and the extrusion block, before the test, the volume of the sampling cavity is zero, when the test is required, the extraction block moves toward the trigger unit, the volume of the sampling cavity gradually increases and sucks in the fluid added with the drag reducer, the sampling cavity is preset with a rated volume, after reaching the rated volume, the extraction block stops moving, the pressure supply unit supplies pressure to the extrusion block, and the extrusion block and the extraction block move synchronously.

[0007] Preferably, a reversing valve is provided on the feed port, and a plurality of ports are provided on the reversing valve, wherein two ports are respectively connected to a cleaning liquid and filtered air, and a discharge port is provided at the lower portion of the test pipe, and the fluid added with the drag reducer after the test is discharged from the discharge port.

[0008] Preferably, a connecting unit is provided between the feed port and the reversing valve, the connecting unit comprising a ring sleeved on the periphery of the test pipe, the ring being rotatably arranged on the periphery of the test pipe around the axis of the test pipe, a connecting groove being provided on the ring along the radial direction of the ring, when the connecting groove is located at the upper part of the ring and is in a vertical position, the reversing valve is connected with the feed port, when the connecting groove is located at the lower part of the ring and is in a vertical position, the connecting groove is connected with the discharge port, and when the test pipe is in a test state, the connecting groove is disconnected from the test pipe.

[0009] Preferably, an annular sleeve is fixedly provided on the side wall of the connecting groove, and an annular cavity is formed between the annular sleeve and the side wall of the connecting groove, and the annular cavity has an expansion state and a contraction state. The annular cavity is in an expansion state when the fluid added with the drag reducer does not flow into the test pipeline through the reversing valve, and is in a contraction state when the fluid added with the drag reducer flows into the test pipeline. After the volume of the sampling cavity reaches the rated volume, the annular cavity switches to the expansion state again.

[0010] Preferably, a first gear ring is fixedly provided at the end of the collar, the axis of the first gear ring is colinear with the axis of the collar, a first gear is provided on one side of the first gear ring, the first gear and the first gear ring are meshed with each other, and a first rotating driver for driving the first gear to rotate is provided at the end of the first gear.

[0011] Preferably, the trigger unit includes a trigger rod fixedly arranged on the extraction block along the extension direction of the test pipe, the trigger rod is located on the side of the extraction block away from the extrusion block, and a trigger sleeve is arranged at the end of the test pipe along the extension direction of the test pipe. The trigger sleeve is arranged on the periphery of the trigger rod, and the trigger sleeve is slidably matched with the trigger rod. A trigger button and a timer are arranged at the bottom of the trigger sleeve. The trigger rod can trigger the trigger button, and the timer starts timing when the pressure supply unit is started and stops timing after the trigger button is triggered.

[0012] Preferably, an air pump and a valve body are respectively provided at the upper and lower parts of the trigger sleeve. When the extraction block extracts the fluid added with the drag reducer, the air pump starts and extracts the air in the trigger sleeve. At this time, the valve body is in a closed state. After the sampling chamber reaches the rated volume, the air pump stops running and the valve body opens.

[0013] Preferably, the pressure supply unit includes a liquid storage tank arranged on one side of the test pipeline, a hoist is arranged on the upper part of the liquid storage tank, a traction rope is wound on the hoist, one end of the traction rope extends to the upper part of the liquid storage tank and is fixedly connected to the liquid storage tank, a pressure supply pipe is connected to the end of the test pipeline, a pressure supply rod is vertically slidably arranged on the pressure supply pipe, the upper part of the pressure supply rod is fixedly connected to the bottom of the liquid storage tank, a follower cavity is present between the pressure supply rod and the extrusion block, the follower cavity is filled with hydraulic oil, and the thrust of the extrusion block is provided by the gravity of the liquid storage tank.

[0014] Preferably, a cylindrical shell is vertically sleeved on the outside of the liquid storage tank, and a locking unit is provided on the shell. The liquid storage tank is in the highest position when the liquid is filled, and the locking unit is located at the lower part of the liquid storage tank when it is in the highest position. The locking unit includes a locking rod, and the locking rod is slidably arranged on the side wall of the shell along the radial direction of the shell. When the liquid storage tank is in the highest position, the upper part of the locking rod contacts the bottom of the liquid storage tank.

[0015] The present invention also relates to a method for testing a drag reducer performance test device for oil and gas gathering and transportation, using a drag reducer performance test device, and the specific steps are as follows: S1. Set up multiple test pipes, connect the fluid without drag reducer and the fluid with different proportions of drag reducer to the test pipes respectively, the extraction block moves in the direction away from the extrusion block, the volume of the sampling cavity between the extraction block and the extrusion block increases and sucks in the measured fluid, and when the volume of the sampling cavity reaches the rated volume, the extraction block stops moving.

[0016] S2. When the extraction blocks in all the test pipes stop moving, the pressure supply units corresponding to the ends of all the test pipes are started synchronously and push the extrusion blocks. The extrusion blocks and the extraction blocks move synchronously and at the same speed. The fluid to be tested in the sampling chamber moves at the same speed as the extrusion blocks. The test is completed when the extraction block reaches the trigger unit position at one end of the test pipe. The final test results are compared to judge the performance of the drag reducer.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. When the test starts, the volume of the sampling chamber is zero, and the extraction block is located directly below the feed port. Before the test, a certain amount of fluid with added drag reducer needs to be taken into the test pipe, so the extraction block begins to move along the extension direction of the test pipe, and the extraction block gradually moves away from the extrusion block, and the sampling chamber between the extraction block and the extrusion block gradually becomes larger. Since the sampling chamber is preset with a rated volume, when the sampling chamber reaches the rated volume, the extraction block stops moving, and then the pressure supply unit starts and starts to squeeze the extrusion block. At this time, the feed port is closed, and the extrusion block pushes the sampling chamber to move. The extrusion block and the extraction block move synchronously and at the same speed. Since the length of the test pipe is constant, the fluid with added drag reducer flows in the test pipe and reaches the end of the test pipe where the trigger unit is set to complete the test. Since multiple groups of comparative tests are required during the test, if the drag reducer has good performance, the movement speed of the fluid with the drag reducer added must be faster than the movement speed of the fluid without the drag reducer added. The specific judgment standard can be used to make non-standard classifications of the drag reducer performance after the test according to actual conditions, and is not specified here. In this way, when conducting the test, only a small amount of the fluid to be tested needs to be taken, which reduces the consumption of the fluid to be tested during the test and reduces the test cost.

[0018] 2. By setting a rotatable collar on the test pipe and opening a connecting groove on the collar, it is ensured that the feed port and the discharge port can achieve normal feeding and discharging. At the same time, during the test, the connecting groove is staggered with the feed port, avoiding the disadvantage that the traditional switch valve cannot withstand pressure, reducing the subsequent maintenance cost, and setting an annular sleeve on the connecting groove. The annular cavity switches between the expansion state and the contraction state, reducing the influence of the air retained in the connecting groove on the final test results.

[0019] 3. By setting up a liquid storage tank, the extrusion block can obtain a constant pressure during extrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of a drag reducer performance testing device.

[0021] Figure 2 It is a side view of a drag reducer performance testing device.

[0022] Figure 3 It is a drag reducer performance testing device Figure 2 Schematic cross-sectional view at AA in the middle.

[0023] Figure 4 It is a drag reducer performance testing device Figure 3 A local enlarged schematic diagram of point B in the middle.

[0024] Figure 5 It is a cutaway stereoscopic schematic diagram of a drag reducer performance testing device.

[0025] Figure 6 It is a drag reducer performance testing device Figure 5 A partial enlarged schematic diagram of point C in the middle.

[0026] Figure 7 It is a drag reducer performance testing device Figure 5 A local enlarged schematic diagram of point D in the middle.

[0027] Figure 8 The present invention is a cutaway stereoscopic schematic diagram of a drag reducer performance testing device when the annular cavity is in a contracted state.

[0028] Fig. 9 It is a drag reducer performance testing device Figure 8 A partial enlarged schematic diagram of point E in the middle.

[0029] Fig.10 The present invention is a cutaway stereoscopic schematic diagram of a drag reducer performance testing device when the annular cavity is in an expanded state.

[0030] Fig.11 It is a drag reducer performance testing device Fig.10 A partial enlarged schematic diagram of point F in the middle.

[0031] The numbers in the figure are: 1. Pressure supply unit; 11. Liquid storage tank; 12. Hoist; 13. Traction rope; 14. Pressure supply pipe; 15. Pressure supply rod; 16. Locking unit; 161. Locking rod; 162. Support plate; 1621. Guide groove; 163. Rotating plate; 1631. Inclined groove; 164. Second rotary drive; 165. Second gear; 166. Second gear ring; 167. Locking sleeve; 168. Spring; 17. Housing; 2 , test pipe; 21, extrusion block; 22, extraction block; 23, feed port; 24, reversing valve; 25, discharge port; 26, connecting unit; 261, collar; 262, connecting groove; 263, annular sleeve; 264, first gear ring; 265, first gear; 266, first rotary drive; 3, trigger unit; 31, trigger rod; 32, trigger sleeve; 321, trigger button; 33, air pump; 34, valve body. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Reference Figure 1 and Figure 4 A drag reducer performance test device, comprising a pressure supply unit 1, a test pipe 2 and a trigger unit 3; a feed port 23 is vertically opened on the test pipe 2, and a fluid with a drag reducer added can be injected into the test pipe 2 through the feed port 23, and an extrusion block 21 is arranged on the side of the feed port 23 close to the pressure supply unit 1, and the extrusion block 21 is slidably arranged in the test pipe 2 along the extension direction of the test pipe 2, and the extrusion block 21 is driven by the pressure supply unit 1, and an extraction block 22 is arranged on one side of the extrusion block 21, and the extraction block 22 is arranged along the extension direction of the test pipe 2. The test pipe 2 is slidably arranged in the test pipe 2 in the extension direction. The extraction block 22 is pneumatically driven. A sampling chamber is present between the extraction block 22 and the extrusion block 21. Before the test, the volume of the sampling chamber is zero. When the test is required, the extraction block 22 moves toward the trigger unit 3, and the volume of the sampling chamber gradually increases and sucks in the fluid added with the drag reducer. The sampling chamber is preset with a rated volume. After reaching the rated volume, the extraction block 22 stops moving, and the pressure supply unit 1 supplies pressure to the extrusion block 21, and the extrusion block 21 and the extraction block 22 move synchronously.

[0034] The fluid with added drag reducer is referred to as the tested fluid. The test method for the performance of drag reducer is relatively unified, that is, a certain proportion of drag reducer is added to the fluid, such as oil. Since the drag reducer can reduce the resistance of the fluid during transportation, the fluid can be transported faster. In this way, the flow rate of the fluid with added drag reducer can be tested, and then the drag reduction effect of the drag reducer can be judged. In the existing test system, before the test, the test pipe 2 is in a hollow structure, that is, the test pipe 2 is filled with gas. This is because the test pipe 2 needs to drain the test fluid and perform self-cleaning after each test. In this way, during the test, the fluid added with the drag reducer needs to be directly injected into the test pipe 2. When the fluid added with the drag reducer enters the test pipe 2, it cannot completely fill the cross-section of the test pipe 2 in the vertical direction. In this way, a large amount of the fluid to be tested needs to be injected into the test pipe 2 until the test pipe 2 is filled with the fluid to be tested before the test can be officially started. The specific test method is to monitor the amount of the fluid to be tested discharged from the test pipe 2 per unit time, and compare it with the monitoring result of the fluid without the drag reducer, so as to judge the performance of the drag reducer, that is, the better the performance of the drag reducer, the more the total amount of fluid discharged from the test pipe 2 per unit time, and conversely, the worse the performance of the drag reducer, the less the total amount of fluid discharged from the test pipe 2. However, this consumes a large amount of the fluid to be tested and has a high test cost.

[0035] In order to reduce the amount of fluid used during the test, the test device is further optimized. The specific working principle is as follows: when the test starts, the end of the extrusion block 21 facing the extraction block 22 is tangent to the side wall of the feed port 23 facing the pressure supply unit 1, and the extraction block 22 and the extrusion block 21 are in contact with each other. At this time, the sampling cavity between the extraction block 22 and the extrusion block 21 has not been formed, so the volume of the sampling cavity is zero. At this time, the extraction block 22 is located directly below the feed port 23. Before the test, a certain amount of fluid with added drag reducer needs to be taken into the test pipe 2. In this way, the extraction block 22 begins to move along the extension direction of the test pipe 2, and the extraction block 22 gradually moves away from the extrusion block 21, and the sampling cavity between the extraction block 22 and the extrusion block 21 gradually becomes larger. It is worth noting that if the extraction block 22 is located directly below the feed port 23, and the extrusion block 21 is separated from the side wall of the feed port 23, then the extraction block 22 that is in contact with the end of the extrusion block 21 cannot move smoothly under the action of pneumatic force. This is because the sampling cavity between the extrusion block 21 and the extraction block 22 is locked by the test pipe 2. Only when the end of the extrusion block 21 is tangent to or intersects with the side wall of the feed port 23, can the extraction block 22 move smoothly in the test pipe 2. This is because during the extraction process of the extraction block 22, the sampling cavity between the extraction block 22 and the extrusion block 21 gradually becomes larger and generates negative pressure. The negative pressure generated by the sampling cavity can suck the fluid added with the drag reducer into the sampling cavity. Since the sampling cavity is preset with a rated volume, when the sampling cavity reaches the rated volume, the extraction block 22 stops moving, and then the pressure supply unit 1 starts and starts to squeeze the extrusion block 21. At this time, the feed port 23 is closed, and the extrusion block 21 pushes the sampling cavity to move. The extrusion block 21 and the extraction block 22 move synchronously and at the same speed. Since the length of the test pipe 2 is constant, the fluid added with the drag reducer flows in the test pipe 2 and reaches the end of the test pipe 2 where the trigger unit 3 is provided to complete the detection. Since multiple groups of comparative tests are required during the test, if the drag reducer has good performance, the movement speed of the fluid with the drag reducer added must be faster than the movement speed of the fluid without the drag reducer added. The specific judgment standard can be used to make non-standard classifications of the drag reducer performance after the test according to actual conditions, and is not specified here. In this way, when conducting the test, only a small amount of the fluid to be tested needs to be taken, which reduces the consumption of the fluid to be tested during the test and reduces the test cost.

[0036] The volume size of the sampling chamber is monitored by setting a rangefinder on the side of the extraction block 22 away from the extrusion block 21, so that the monitoring end of the rangefinder is horizontally pointed to the extraction block 22. The rangefinder is preset with a rated length. When the extraction block 22 moves and reaches the rated length, the cross-sectional area of ​​the test pipe 2 is constant, so the rated volume of the sampling chamber can be determined.

[0037] Reference Figure 4A reversing valve 24 is provided on the feed port 23, and a plurality of ports are provided on the reversing valve 24, two of which are respectively connected to a cleaning liquid and filtered air. A discharge port 25 is provided at the lower portion of the test pipe 2, and the fluid added with the drag reducer after the test is completed is discharged from the discharge port 25.

[0038] All ports except the above two ports are connected with the measured fluid. During the test, the discharge port 25 is in a closed state. After the test is completed, the extrusion block 21 and the extraction block 22 slide and reset, and the extrusion block 21 moves to the side of the feed port 23 close to the pressure supply unit 1, and at this time, the end of the extrusion block 21 is tangent to the side wall of the feed port 23, and the discharge port 25 is located directly below the feed port 23. When the extrusion block 21 moves to the initial position, it stops moving. Since there is still a sampling cavity between the extrusion block 21 and the extraction block 22 at this time, the extraction block 22 continues to move. When the extrusion block 21 and the extraction block 22 are reset, the discharge port 25 is opened. In this way, when the extrusion block 21 is reset and the extraction block 22 continues to move, the measured fluid in the sampling cavity can be discharged through the discharge port 25. When the extraction block 22 contacts the end of the extrusion block 21, the discharge port 25 is closed. Close, the reversing valve 24 is reversed, and the reversing valve 24 is connected with the cleaning liquid. Then the extraction block 22 is pneumatically moved again toward the side away from the extrusion block 21. When the extraction block 22 moves to one end of the test pipe 2, the discharge port 25 is opened, and the extraction block 22 moves in the reverse direction. That is, at this time, the extraction block 22 moves toward the extrusion block 21. When the extraction block 22 contacts the extrusion block 21, the discharge port 25 is closed again, and then the reversing valve 24 is reversed again, and the reversing valve 24 is connected with the filtered air. At this time, the extraction block 22 moves again in the direction away from the extrusion block 21. The extraction block 22 draws the filtered air into the test pipe 2, and after the extraction block 22 reaches the end of the test pipe 2, the discharge port 25 is opened again, so that the cleaning liquid and air remaining in the test pipe groove can be discharged, thereby realizing the self-cleaning function of the test pipe 2.

[0039] Reference Figure 4 , Figure 5 and Fig. 9 A connecting unit 26 is provided between the feed port 23 and the reversing valve 24. The connecting unit 26 includes a sleeve 261 which is sleeved on the periphery of the test pipe 2. The sleeve 261 is rotatably provided on the periphery of the test pipe 2 around the axis of the test pipe 2. A connecting groove 262 is provided on the sleeve 261 along the radial direction of the sleeve 261. When the connecting groove 262 is located at the upper part of the sleeve 261 and is in a vertical position, the reversing valve 24 is connected with the feed port 23. When the connecting groove 262 is located at the lower part of the sleeve 261 and is in a vertical position, the connecting groove 262 is connected with the discharge port 25. When the test pipe 2 is in a test state, the connecting groove 262 is disconnected from the test pipe 2.

[0040] No matter the connecting groove 262 is connected with the feed port 23 or the discharge port 25, it is actually the connecting groove 262 that is connected with the test pipe 2. The disconnection of the connecting groove 262 and the test pipe 2 means that when the test pipe 2 is tested, the test pipe 2 and the reversing valve 24 are in a non-connected state. This is because when the test is being conducted, there is a relatively large pressure in the test pipe 2. If the reversing valve 24 and the test pipe 2 are connected during the test, the service life of the reversing valve 24 will be reduced after long-term use. In order to avoid the above situation, the test pipe 2 and the reversing valve 24 are disconnected when the test pipe 2 is in the test state, and the collar 261 is used instead of the traditional switch valve. This is because although the switch valve can disconnect the reversing valve 24 from the test pipe 2, the switch valve itself will still be subjected to a relatively large pressure during the test, which results in the switch valve needing to be frequently replaced. By rotating the collar 261, the feed port 23 and the discharge port 25 in the test pipe 2 can be opened and closed. Since only one connecting groove 262 is provided on the collar 261, when the feed port 23 is connected with the connecting groove 262, the discharge port 25 must be in a closed state. Conversely, when the discharge port 25 and the connecting groove 262 are connected with each other, the feed port 23 must be in a closed state.

[0041] Reference Fig. 9 : An annular sleeve 263 is fixedly arranged on the side wall of the connecting groove 262, and an annular cavity is formed between the annular sleeve 263 and the side wall of the connecting groove 262. The annular cavity has an expansion state and a contraction state. The annular cavity is in an expansion state when the fluid added with the drag reducer does not flow into the test pipe 2 through the reversing valve 24, and is in a contraction state when the fluid added with the drag reducer flows into the test pipe 2. After the volume of the sampling cavity reaches the rated volume, the annular cavity switches to the expansion state again.

[0042] Before the test is started, the annular cavity is in an expanded state. Before the extraction block 22 moves to extract the measured fluid, the reversing valve 24 is first connected to the measured fluid, and then the measured fluid flows into the connecting groove 262 and gradually squeezes the annular sleeve 263, so that the annular cavity gradually changes from an expanded state to a contracted state. When the annular cavity is in a contracted state, the annular sleeve 263 is tightly attached to the side wall of the connecting groove 262. After the test is completed, the reversing valve 24 needs to be reversed twice, so that the cleaning fluid and the filtered air enter the test pipe 2 in turn, thereby completing the cleaning of the test pipe 2. When cleaning is completed, the extraction block 22 will reset to one side of the extrusion block 21 and contact the extrusion block 21. At this time, there is air in the connecting groove 262 located at the upper part of the feed port 23. At this time, the annular cavity is in a contracted state. In order to avoid the air remaining in the circulation groove from affecting the subsequent test of the measured fluid, it is necessary to exhaust the air in the connecting groove 262 as much as possible. In this way, a suction pump is provided on one side of the reversing valve 24. The suction pump extracts the air in the connecting groove 262 through the reversing valve 24, so that the annular cavity is restored to the expanded state again, thereby ensuring the subsequent test results.

[0043] Reference Fig. 9 and Fig.11 A first gear ring 264 is fixedly provided at the end of the collar 261, the axis of the first gear ring 264 is colinear with the axis of the collar 261, a first gear 265 is provided on one side of the first gear ring 264, the first gear 265 and the first gear ring 264 are meshed with each other, and a first rotation driver 266 for driving the first gear 265 to rotate is provided at the end of the first gear 265.

[0044] The first rotary driver 266 is preferably a servo motor. When the first rotary driver 266 is started, the first gear 265 can drive the first gear ring 264 to rotate, thereby rotating the collar 261 mounted on the test pipe 2, so that the connecting groove 262 on the collar 261 can switch between the feed port 23 and the discharge port 25.

[0045] Reference Figure 4 , Figure 5 and Figure 7 : The trigger unit 3 includes a trigger rod 31 fixedly arranged on the extraction block 22 along the extension direction of the test pipe 2, the trigger rod 31 is located on the side of the extraction block 22 away from the extrusion block 21, and a trigger sleeve 32 is arranged at the end of the test pipe 2 along the extension direction of the test pipe 2. The trigger sleeve 32 is sleeved on the periphery of the trigger rod 31, and the trigger sleeve 32 and the trigger rod 31 are slidably matched. A trigger button 321 and a timer are arranged at the bottom of the trigger sleeve 32. The trigger rod 31 can trigger the trigger button 321. The timer starts timing when the pressure supply unit 1 is started and stops timing after the trigger button 321 is triggered.

[0046] The performance of the drag reducer is judged by the length of the measured time. The faster the speed and the shorter the time, the better the drag reduction performance of the drag reducer.

[0047] Reference Figure 7 An air pump 33 and a valve body 34 are respectively provided at the upper and lower parts of the trigger sleeve 32. When the extraction block 22 extracts the fluid added with the drag reducer, the air pump 33 starts and extracts the air in the trigger sleeve 32. At this time, the valve body 34 is in a closed state. After the sampling chamber reaches the rated volume, the air pump 33 stops running and the valve body 34 opens.

[0048] When it is necessary to draw the measured fluid into the test pipe 2, after the air pump 33 is started, the valve body 34 is in a closed state, the gas in the trigger sleeve 32 is extracted, and the extraction block 22 moves toward the side away from the extrusion block 21. When the volume of the sampling chamber reaches the rated volume, the air pump 33 stops running, the valve body 34 opens, and the pressure supply unit 1 applies pressure to the extrusion block 21. Since the trigger sleeve 32 is connected to the outside world, the trigger rod 31 can move smoothly in the trigger sleeve 32.

[0049] Reference Figure 3 The pressure supply unit 1 includes a liquid storage tank 11 arranged on one side of the test pipe 2, and a hoist 12 is arranged on the upper part of the liquid storage tank 11. A traction rope 13 is wound around the hoist 12, and one end of the traction rope 13 extends to the upper part of the liquid storage tank 11 and is fixedly connected to the liquid storage tank 11. A pressure supply pipe 14 is connected to the end of the test pipe 2, and a pressure supply rod 15 is vertically slidably arranged on the pressure supply pipe 14. The upper part of the pressure supply rod 15 is fixedly connected to the bottom of the liquid storage tank 11, and a follower cavity is present between the pressure supply rod 15 and the extrusion block 21. The follower cavity is filled with hydraulic oil, and the thrust of the extrusion block 21 is provided by the gravity of the liquid storage tank 11.

[0050] In this way, the tester can fill the liquid storage tank 11 with water of corresponding weight according to the pressure to be tested. When the filling is completed, the hoist 12 lowers the liquid storage tank 11 so that the gravity of the liquid storage tank 11 acts on the extrusion block 21. Since the gravity of the liquid storage tank 11 is always constant, it is ensured that the thrust of the extrusion block 21 is always constant when pushing the sampling chamber to move. It is worth noting that water is only started to be filled into the liquid storage tank 11 when the liquid storage tank 11 is at the highest position.

[0051] Reference Figure 2 , Figure 3 and Figure 6: A cylindrical shell 17 is vertically sleeved on the outside of the liquid storage tank 11, and a locking unit 16 is arranged on the shell 17. The liquid storage tank 11 is at the highest position when filled with liquid. The locking unit 16 is located at the lower part of the liquid storage tank 11 when it is at the highest position. The locking unit 16 includes a locking rod 161, and the locking rod 161 is slidably arranged on the side wall of the shell 17 along the radial direction of the shell 17. When the liquid storage tank 11 is at the highest position, the upper part of the locking rod 161 contacts the bottom of the liquid storage tank 11.

[0052] In this way, it can be avoided that the traction rope 13 is always stressed during the filling process of the liquid storage tank 11, thereby reducing the service life of the traction rope 13. The locking unit 16 also includes a support plate 162, a rotating plate 163, a second rotating driver 164, a second gear 165, a second gear ring 166, a locking sleeve 167 and a spring 168. The support plate 162 and the rotating plate 163 are both annular structures. The support plate 162 is fixedly sleeved on the outside of the shell 17. The support plate 162 is evenly provided with A plurality of guide grooves 1621 are provided on the support plate 162 along the radial direction of the outer shell 17. A locking sleeve 167 is provided at one end of the locking rod 161. The locking rod 161 extends into the locking sleeve 167 and slides with the locking sleeve 167. There is a gap between the end of the locking rod 161 and the bottom of the locking sleeve 167. A spring 168 is provided in the gap along the extension direction of the locking rod 161, and the two ends of the spring 168 are fixedly connected to the end of the locking rod 161 and the bottom of the locking sleeve 167, respectively. When the liquid storage tank 11 rises from the lowest position, the locking rod 161 will be pressed into the locking sleeve 167. This is because the lower part of the locking rod 161 is chamfered, which ensures that the locking rod 161 can be pushed into the locking sleeve 167 when the liquid storage tank 11 rises. When the liquid storage tank 11 reaches the highest position, the locking rod 161 pops out again under the action of the spring 168, and the locking rod 161 supports the liquid storage tank 11. The lower part of the locking sleeve 167 extends into the guide groove 1621 and slides with the guide groove 1621 along the radial direction of the shell 17. A rotating disk 163 is provided on the upper part of the locking sleeve 167. The rotating disk 163 is sleeved on the outer periphery of the shell 17. A plurality of inclined grooves 1631 are evenly opened on the rotating disk 163 around the axis of the shell 17. The extension direction of the inclined groove 1631 is at an angle with the radial direction of the shell 17, and the angle is an acute angle. The axis of the rotating disk 163 is colinear with the axis of the shell 17. The upper part of the locking sleeve 167 extends into the inclined groove 1631 and slides in the inclined groove 1631 along the extension direction of the inclined groove 1631. When the liquid storage tank 11 is filled, the hoist 12 first releases the traction rope 13, and then the rotating disk 163 rotates, and the locking sleeve 167 drives the locking rod 161 to withdraw from the bottom of the liquid storage tank 11, and the liquid storage tank 11 can begin to descend under the action of its own gravity. In order to drive the rotating disk 163 to rotate, a second gear ring 166 is fixedly provided on the upper part of the rotating disk 163, and a second gear 165 is provided on one side of the second gear ring 166. The second gear ring 166 and the second gear 165 are meshed with each other. A second rotation driver 164 is provided at the end of the second gear 165. The second rotation driver 164 is used to drive the second gear 165 to rotate. The second rotation driver 164 is preferably a servo motor.

[0053] Reference Figure 1-Figure 11The present invention also relates to a drag reducer performance testing device for oil and gas gathering and transportation testing method, using a drag reducer performance testing device, the specific steps are as follows: S1. Set up multiple test pipes 2, connect the fluid without drag reducer and the fluid with different proportions of drag reducer to the test pipes 2 respectively, the extraction block 22 moves in the direction away from the extrusion block 21, the volume of the sampling cavity between the extraction block 22 and the extrusion block 21 increases and sucks in the measured fluid, and when the volume of the sampling cavity reaches the rated volume, the extraction block 22 stops moving.

[0054] S2. When the extraction blocks 22 in all the test pipes 2 stop moving, the pressure supply units 1 corresponding to the ends of all the test pipes 2 are started synchronously and push the extrusion block 21. The extrusion block 21 moves synchronously and at the same speed as the extraction block 22. The fluid to be tested in the sampling chamber moves at the same speed as the extrusion block 21. The test is completed when the extraction block 22 reaches the position of the trigger unit 3 at one end of the test pipe 2, and the final test results are compared to judge the performance of the drag reducer.

[0055] Working principle: When the test starts, the end of the extrusion block 21 facing the extraction block 22 is tangent to the side wall of the feed port 23 facing the pressure supply unit 1, and the extraction block 22 and the extrusion block 21 are in contact with each other. At this time, the sampling cavity between the extraction block 22 and the extrusion block 21 is not formed, so the volume of the sampling cavity is zero. At this time, the extraction block 22 is located directly below the feed port 23. Before the test, a certain amount of fluid with added drag reducer needs to be taken into the test pipe 2. In this way, the extraction block 22 begins to move along the extension direction of the test pipe 2, and the extraction block 22 gradually moves away from the extrusion block 21, and the sampling cavity between the extraction block 22 and the extrusion block 21 gradually becomes larger. Since the sampling chamber is preset with a rated volume, when the sampling chamber reaches the rated volume, the extraction block 22 stops moving, and then the pressure supply unit 1 starts and starts squeezing the extrusion block 21. At this time, the feed port 23 is closed, and the extrusion block 21 pushes the sampling chamber to move. The extrusion block 21 and the extraction block 22 move synchronously and at the same speed. Since the length of the test pipe 2 is constant, the fluid with the drag reducer added flows in the test pipe 2 and reaches the end of the test pipe 2 where the trigger unit 3 is set to complete the test. Since multiple groups of comparative tests need to be performed during the test, if the drag reducer has good performance, the movement speed of the fluid with the drag reducer added must be faster than the movement speed of the fluid without the drag reducer added. The specific judgment standard can be used to divide the drag reducer performance after the test into non-standard categories according to actual conditions, and is not specified here. In this way, when conducting the test, only a small amount of the fluid to be tested needs to be taken, which reduces the consumption of the fluid to be tested during the test and reduces the test cost.

[0056] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A drag reducer performance testing device, comprising a pressure supply unit (1), a test pipeline (2) and a trigger unit (3); It is characterized in that A feed port (23) is vertically provided on the test pipe (2), and a fluid containing a drag reducing agent can be injected into the test pipe (2) through the feed port (23). An extrusion block (21) is provided on one side of the feed port (23) close to the pressure supply unit (1). The extrusion block (21) is slidably provided in the test pipe (2) along the extension direction of the test pipe (2). The extrusion block (21) is driven by the pressure supply unit (1). An extraction block (22) is provided on one side of the extrusion block (21). The extraction block (22) is slidably provided in the extension direction of the test pipe (2). The extraction block (22) is placed in the test pipe (2), and is pneumatically driven. A sampling chamber is provided between the extraction block (22) and the extrusion block (21). Before the test, the volume of the sampling chamber is zero. When the test is required, the extraction block (22) moves toward the trigger unit (3), and the volume of the sampling chamber gradually increases and sucks in the fluid added with the drag reducing agent. The sampling chamber is preset with a rated volume. After reaching the rated volume, the extraction block (22) stops moving, and the pressure supply unit (1) supplies pressure to the extrusion block (21), so that the extrusion block (21) and the extraction block (22) move synchronously.

2. A drag reducer performance testing device according to claim 1, characterized in that: A reversing valve (24) is provided on the feed port (23), and a plurality of ports are provided on the reversing valve (24), two of which are connected to a cleaning liquid and filtered air respectively. A discharge port (25) is provided at the lower part of the test pipe (2), and the fluid added with the drag reducing agent after the test is discharged from the discharge port (25).

3. A drag reducer performance testing device according to claim 2, characterized in that: A communication unit (26) is provided between the feed port (23) and the reversing valve (24). The communication unit (26) comprises a collar (261) sleeved on the periphery of the test pipe (2). The collar (261) is rotatably provided on the periphery of the test pipe (2) around the axis of the test pipe (2). A communication groove (262) is provided on the collar (261) along the radial direction of the collar (261). When the communication groove (262) is located at the upper part of the collar (261) and is in a vertical position, the reversing valve (24) is in communication with the feed port (23). When the communication groove (262) is located at the lower part of the collar (261) and is in a vertical position, the communication groove (262) is in communication with the discharge port (25). When the test pipe (2) is in a test state, the communication groove (262) is disconnected from the test pipe (2).

4. A drag reducer performance testing device according to claim 3, characterized in that: An annular sleeve (263) is fixedly arranged on the side wall of the connecting groove (262), and an annular cavity is formed between the annular sleeve (263) and the side wall of the connecting groove (262). The annular cavity has an expansion state and a contraction state. The annular cavity is in the expansion state when the fluid added with the drag reducer does not flow into the test pipe (2) through the reversing valve (24), and is in the contraction state when the fluid added with the drag reducer flows into the test pipe (2). After the volume of the sampling cavity reaches the rated volume, the annular cavity switches to the expansion state again.

5. A drag reducer performance testing device according to claim 3, characterized in that: A first gear ring (264) is fixedly arranged at the end of the collar (261), the axis of the first gear ring (264) is colinear with the axis of the collar (261), a first gear (265) is arranged on one side of the first gear ring (264), the first gear (265) and the first gear ring (264) are meshed with each other, and a first rotation driver (266) for driving the first gear (265) to rotate is arranged at the end of the first gear (265).

6. A drag reducer performance testing device according to claim 1, characterized in that: The trigger unit (3) comprises a trigger rod (31) fixedly arranged on the extraction block (22) along the extension direction of the test pipe (2); the trigger rod (31) is located on a side of the extraction block (22) away from the extrusion block (21); a trigger sleeve (32) is arranged at the end of the test pipe (2) along the extension direction of the test pipe (2); the trigger sleeve (32) is sleeved on the periphery of the trigger rod (31); the trigger sleeve (32) and the trigger rod (31) are slidably matched; a trigger button (321) and a timer are arranged at the bottom of the trigger sleeve (32); the trigger rod (31) can trigger the trigger button (321); the timer starts timing when the pressure supply unit (1) is started and stops timing when the trigger button (321) is triggered.

7. A drag reducer performance testing device according to claim 6, characterized in that: An air pump (33) and a valve body (34) are respectively arranged at the upper and lower parts of the trigger sleeve (32). When the extraction block (22) extracts the fluid to which the drag reducing agent is added, the air pump (33) is started and the air in the trigger sleeve (32) is extracted. At this time, the valve body (34) is in a closed state. After the sampling chamber reaches the rated volume, the air pump (33) stops running and the valve body (34) opens.

8. A drag reducer performance testing device according to claim 1, characterized in that: The pressure supply unit (1) comprises a liquid storage tank (11) arranged on one side of a test pipe (2), a hoist (12) being arranged on the upper part of the liquid storage tank (11), a traction rope (13) being wound around the hoist (12), one end of the traction rope (13) extending to the upper part of the liquid storage tank (11) and being fixedly connected to the liquid storage tank (11), a pressure supply pipe (14) being connected to the end of the test pipe (2), a pressure supply rod (15) being vertically slidably arranged on the pressure supply pipe (14), the upper part of the pressure supply rod (15) being fixedly connected to the bottom of the liquid storage tank (11), a follower chamber being present between the pressure supply rod (15) and the extrusion block (21), the follower chamber being filled with hydraulic oil, and the thrust of the extrusion block (21) being provided by the gravity of the liquid storage tank (11).

9. A drag reducer performance testing device according to claim 8, characterized in that: A cylindrical outer shell (17) is vertically sleeved on the outside of the liquid storage tank (11), and a locking unit (16) is arranged on the outer shell (17). When the liquid storage tank (11) is filled with liquid, it is in the highest position. The locking unit (16) is located at the lower part of the liquid storage tank (11) when it is in the highest position. The locking unit (16) includes a locking rod (161). The locking rod (161) is slidably arranged on the side wall of the outer shell (17) along the radial direction of the outer shell (17). When the liquid storage tank (11) is in the highest position, the upper part of the locking rod (161) contacts the bottom of the liquid storage tank (11).

10. A method for testing a drag reducer performance test device for oil and gas gathering and transportation, using a drag reducer performance test device as claimed in any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1, setting a plurality of test pipes (2), connecting a fluid without adding a drag reducer and a fluid with adding a drag reducer in different proportions to the test pipes (2), respectively, and moving the extraction block (22) in a direction away from the extrusion block (21), so that the volume of the sampling cavity between the extraction block (22) and the extrusion block (21) increases and sucks in the fluid to be tested, and when the volume of the sampling cavity reaches the rated volume, the extraction block (22) stops moving; S2. When the extraction blocks (22) in all the test pipes (2) stop moving, the pressure supply units (1) corresponding to the ends of all the test pipes (2) are started synchronously and push the extrusion block (21). The extrusion block (21) and the extraction block (22) move synchronously and at the same speed. The fluid to be tested in the sampling chamber moves at the same speed as the extrusion block (21). When the extraction block (22) reaches the position of the trigger unit (3) at one end of the test pipe (2), the test is completed.

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