Evaluation experiment device and method for simulating screen pipe blockage and hydraulic pulse blockage removal

Abstract

The invention discloses a screen pipe blockage simulation and hydraulic pulse blockage removal evaluation experiment device and method, the device comprises a simulation mechanism, an injection mechanism and a blockage removal mechanism, the simulation mechanism comprises a plurality of simulation assemblies, and each simulation assembly comprises an upper sleeve, a slotting piece, a lower sleeve, an upper pressure sensor, a lower pressure sensor and a branch flow meter; the injection mechanism comprises a liquid storage tank and a slurry pump; the unblocking mechanism comprises a water tank and a pulse plunger pump. The evaluation experiment device and method for simulating screen pipe blockage and hydraulic pulse blockage removal, provided by the invention, have the beneficial effects that the influence of the sand concentration or the sand particle size on blockage and blockage removal of a slotting sheet can be researched by changing the sand concentration or the sand particle size of sand-containing fluid; the influence of the sand concentration or the sand particle size on the blockage and blockage removal of the slotting sheet can be researched by changing the pulse frequency or the pulse amplitude of a pulse plunger pump; the influence of the pulse frequency or the pulse amplitude on the blockage removal of the slotted piece can be researched, so that experimental data support can be provided for determining pulse blockage removal process parameters.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas exploitation, and in particular to an experimental device and method for simulating screen pipe blockage and hydraulic pulse blockage removal evaluation. Background Art

[0002] In the process of exploitation of loose sandstone oil and gas reservoirs, sand production from the formation is a common problem encountered. Mechanical screens or screen gravel packing are usually used to prevent sand. In the production process of sand control wells, the formation fluid will carry solid particles such as formation fine sand, clay mud and mechanical impurities into the wellbore, gradually blocking the screen sand retaining layer, causing the permeability to decrease, affecting the production capacity of oil and water wells. For the problem of screen blockage, the commonly used unblocking methods are mainly chemical unblocking and hydraulic unblocking to restore the seepage capacity of the sand retaining medium. Chemical unblocking is to corrode and fall off the screen blockage by soaking in acid to achieve the purpose of unblocking, but this method has low working efficiency. Compared with chemical unblocking, hydraulic unblocking has less pollution and lower cost, but due to the excessive unblocking pressure, this technology still has disadvantages such as high energy consumption and low efficiency. The high-pressure water pump required by traditional hydraulic unblocking technology is large in size and has high requirements for pump pipes. In contrast, the pulsating unblocking method can effectively reduce the unblocking pressure and has better unblocking efficiency.

[0003] When implementing the pulsation unblocking method, it is necessary to consider the matching relationship between the pulsation frequency and amplitude of the pulsation pump and the blockage of the screen tube, so as to formulate the best unblocking plan. At present, the determination of parameters such as pulsation frequency and pulsation amplitude mainly relies on manual experience for design, and there is a lack of relevant experimental research. Its shortcomings are mainly reflected in the following aspects:

[0004] (1) Lack of precision: Human experience is often based on past practice and personal judgment, which may lead to inaccurate parameter selection. Pulsation frequency and amplitude are crucial to the unblocking effect. Inaccurate parameters may lead to poor unblocking effect and may even cause damage to the pipeline or equipment.

[0005] (2) Unpredictability: Due to its reliance on manual experience, it is difficult to predict the effect of pulsation unblocking. Different pipelines, blockages, and operating conditions may require different parameter settings, and manual experience may not cover all situations.

[0006] (3) Low efficiency: If the parameters are not set properly, it may take multiple attempts and adjustments to achieve the desired unblocking effect. This not only increases the operation time, but may also increase costs and potential damage to the equipment.

[0007] (4) Difficult to standardize: Since the selection of parameters is based on manual experience, it is difficult to achieve standardization of the unblocking operation. Different operators may choose different parameters, resulting in inconsistency and non-reproducibility of the unblocking effect.

[0008] (5) Difficulty in adapting to changes: As pipelines and equipment age, blockages change, and operating conditions change, the parameters of pulsation deblocking may need to be adjusted. If you rely solely on manual experience, it may be difficult to quickly adapt to these changes, resulting in poor deblocking results or even failure.

[0009] Therefore, in order to improve the efficiency and effect of pulsation unblocking, scientific methods and tools should be used as much as possible to determine parameters such as pulsation frequency and amplitude, such as optimizing parameter settings through simulation experimental methods.

[0010] Therefore, there is an urgent need to provide an experimental device and method for simulating screen tube blockage and hydraulic pulse unblocking evaluation, so as to simulate the screen tube blockage condition and hydraulic pulse unblocking effect under different sand production conditions, and provide experimental data support for the determination of pulsating unblocking process parameters. Summary of the invention

[0011] The purpose of the present invention is to overcome the above technical deficiencies and propose an experimental device and method for simulating screen pipe blockage and hydraulic pulse unblocking evaluation to simulate the screen pipe blockage condition and hydraulic pulse unblocking effect under different sand production conditions, so as to provide experimental data support for the determination of pulsating unblocking process parameters.

[0012] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0013] The present invention provides an experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation, comprising:

[0014] A simulation mechanism, wherein the simulation mechanism comprises a plurality of simulation components, each simulation component comprises an upper sleeve, a slit sheet, a lower sleeve, an upper pressure sensor, a lower pressure sensor and a branch flow meter, the upper sleeve is detachably connected to the lower sleeve, the slit sheet is arranged between the upper sleeve and the lower sleeve, a plurality of slits are formed on the slit sheet, and the width and distance of the slits on the slit sheets of each simulation component are not equal, the upper sleeve is provided with a water inlet, the lower sleeve is provided with a water outlet, the upper pressure sensor is arranged at the water inlet, the lower pressure sensor is arranged at the water outlet, and the branch flow meter is arranged at the water inlet;

[0015] An injection mechanism, the injection mechanism comprising a liquid storage tank and a mud pump, the inlet of the mud pump is connected to the outlet of the liquid storage tank, and the outlet of the mud pump can be selectively connected to or disconnected from the water inlet; and,

[0016] The unblocking mechanism comprises a water tank and a pulse plunger pump, the inlet of the pulse plunger pump is connected to the outlet of the water tank, and the outlet of the pulse plunger pump can be selectively connected or disconnected with the water outlet.

[0017] In some embodiments, each of the simulation components further includes a water inlet branch pipe, one end of which is connected to the corresponding water inlet, and the upper pressure sensor and the branch flow meter are both arranged on the water inlet branch pipe;

[0018] The simulation mechanism further comprises a water inlet main pipe, one end of which is connected to the other end of each of the water inlet branches, and the other end of which is connected to the outlet of the mud pump.

[0019] In some embodiments, each of the water inlet branch pipes is provided with a water inlet branch valve.

[0020] In some embodiments, the injection mechanism further includes a first injection pipe, one end of which is connected to the other end of the water inlet main pipe, the other end of which is connected to the outlet of the mud pump, and a first injection valve is provided on the first injection pipe;

[0021] The unblocking mechanism further includes a first discharge pipe, one end of which is connected to the other end of the water inlet main pipe, and a first discharge valve is provided on the first discharge pipe.

[0022] In some embodiments, a safety valve and a first total flow meter are also provided on the first injection pipe.

[0023] In some embodiments, each of the simulation components further includes a water outlet branch pipe, one end of the water outlet branch pipe is connected to the corresponding water outlet, and the down pressure sensor is arranged on the corresponding water outlet branch pipe;

[0024] The simulation mechanism also includes a water outlet main pipe, one end of which is connected to the other end of each of the water outlet branches, and the other end of the water outlet main pipe is connected to the outlet of the pulse plunger pump.

[0025] In some embodiments, the unblocking mechanism further includes a second injection pipe, one end of which is connected to the other end of the water outlet main pipe, the other end of which is connected to the outlet of the pulse plunger pump, and a second injection valve is provided on the second injection pipe;

[0026] The simulated screen pipe blockage and hydraulic pulse unblocking evaluation experimental device also includes a circulation mechanism, which includes a second discharge pipe, a solid-liquid separator and a circulation pump. One end of the second discharge pipe is connected to the other end of the water outlet main pipe, and a second discharge valve is provided on the second discharge pipe. The inlet of the solid-liquid separator is connected to the other end of the second discharge pipe, the inlet of the circulation pump is connected to the liquid outlet of the solid-liquid separator, and the outlet of the circulation pump is connected to the liquid storage tank.

[0027] In some embodiments, the simulated screen tube blockage and hydraulic pulse unblocking evaluation experimental device also includes a collection mechanism, which includes a data collector and a computer. The data collector is electrically connected to each of the branch flow meters, each of the upper pressure sensors, and each of the lower pressure sensors, and the computer is electrically connected to the data collector.

[0028] The present invention also provides a simulated screen tube blockage and hydraulic pulse blockage removal evaluation experimental method, which is applicable to the simulated screen tube blockage and hydraulic pulse blockage removal evaluation experimental device, and comprises the following steps:

[0029] S1. preparing a sand-containing fluid with a preset sand concentration and storing it in a liquid storage tank;

[0030] S2, connect the outlet of the mud pump with the water inlet, disconnect the outlet of the pulse plunger pump with the water outlet, turn on the mud pump, and the mud pump sucks the sand-containing fluid in the liquid storage tank to the water inlet of the upper sleeve, then passes through the slit sheet and enters the lower sleeve, and finally discharges, and continuously monitors the pressure of the water inlet and the water outlet through the upper pressure sensor and the lower pressure sensor, and at the same time, continuously monitors the flow of the water inlet through the branch flow meter;

[0031] S3. After the pressure is stable, change the displacement of the mud pump and observe the changes of the pressure at the water inlet and outlet over time under different displacement conditions. Each time the displacement is adjusted to a certain level, it is stabilized for a period of time. After collecting multiple data points, the displacement is increased again.

[0032] S4. When the pressure difference between the water inlet and the water outlet exceeds the preset value, the mud pump is stopped, the upper sleeve and the lower sleeve are disassembled, and the slit pieces are taken out to observe the slit gap blockage, so as to compare the slit gap blockage under different slit widths and distances;

[0033] S5, reinstall each slit sheet in the upper sleeve and the lower sleeve, and connect the upper sleeve and the lower sleeve, disconnect the outlet of the mud pump from the water inlet, connect the outlet of the pulse plunger pump with the water outlet, turn on the pulse plunger pump, the pulse plunger pump pumps water in the water tank to the water outlet, the water enters the lower sleeve, passes through the slit sheet and is discharged from the upper sleeve, thereby flushing the sand particles blocking the slit sheet;

[0034] S6. After the pressure difference between the water inlet and the water outlet is stable, the permeability of the simulated component is calculated, and then the pulse plunger pump is turned off, the upper sleeve and the lower sleeve are disassembled, and the slit pieces are taken out to observe the unblocking of the slit gap; thereby comparing the unblocking of the slit pieces under different slit widths and distances;

[0035] S7, changing the sand concentration or sand particle size of the prepared sand-containing fluid, repeating steps S1-S6, and obtaining the influence of the sand concentration or sand particle size on the blocking and unblocking of the slit piece;

[0036] S8, changing the pulse frequency or pulse amplitude of the pulse plunger pump, repeating steps S1-S6, and obtaining the influence of the pulse frequency or pulse amplitude on the unblocking of the slit sheet.

[0037] In some embodiments, in step S6,

[0038] The permeability of the simulated component is calculated by the flow rate collected by the branch flow meter, the detection pressure of the upper pressure sensor and the lower pressure sensor, and the gap parameters of the slit sheet. The formula is:

[0039] k= QμL s

[0040] AΔP

[0041] Where k is the permeability of the simulated component, in μm 2 ; Q is the fluid flow rate collected by the branch flow meter, in m 3 / s; μ is the fluid viscosity, unit is Pa·s; L s is the thickness of the slit sheet, in m; A is the area of ​​the slit sheet, in m 2 ; ΔP is the pressure difference between the upper pressure sensor and the lower pressure sensor, in Pa.

[0042] Compared with the prior art, the experimental device and method for simulating screen pipe blockage and evaluating hydraulic pulse unblocking provided by the present invention have the following beneficial effects: by setting up multiple groups of simulation components, the width and distance of the slits on the slit pieces of each simulation component are not equal, and the sand-containing fluid in the liquid storage tank is sucked to the water inlet of each upper sleeve by a mud pump, and then passes through each slit piece, so that the blockage of the screen pipe with different gap widths and distances can be simulated, and the water in the water tank is sucked to the water outlet by a pulse plunger pump. After entering the lower sleeve, the water passes through the slit piece and is discharged from the upper sleeve, thereby flushing the sand particles blocked on the slit piece, and the hydraulic pulse unblocking effect of the screen pipe with different gap widths and distances can be simulated. By changing the sand concentration or sand particle size of the sand-containing fluid, the influence of the sand concentration or sand particle size on the blockage and unblocking of the slit piece can be studied, and by changing the pulse frequency or pulse amplitude of the pulse plunger pump, the influence of the pulse frequency or pulse amplitude on the unblocking of the slit piece can be studied, thereby providing experimental data support for the determination of the pulsating unblocking process parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of an experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation provided by one embodiment of the present invention;

[0044] Figure 2 yes Figure 1 The structural diagram of the simulated screen tube blockage and hydraulic pulse unblocking evaluation experimental device after omitting the collection mechanism;

[0045] Figure 3 yes Figure 1 Schematic diagram of the structure of the simulation mechanism;

[0046] Figure 4 yes Figure 3 A partial enlarged view of the middle area A;

[0047] Figure 5 yes Figure 1 A top view of the slit sheet in FIG.

[0048] Description of the accompanying drawings: 1-simulation mechanism, 11-simulation component, 111-upper sleeve, 1111-water inlet, 112-slit sheet, 1121-gap, 113-lower sleeve, 1131-water outlet, 1132-retaining ring, 114-upper pressure sensor, 115-lower pressure sensor, 116-branch flow meter, 117-water inlet branch pipe, 1171-water inlet branch valve, 118-water outlet branch pipe, 12-water inlet main pipe, 13-water outlet main pipe, 2-injection mechanism, 21-liquid storage tank, 22-mud pump, 23-first injection Inlet pipe, 231-first injection valve, 24-safety valve, 25-first total flow meter, 3-unblocking mechanism, 31-water tank, 32-pulse plunger pump, 33-first discharge pipe, 331-first discharge valve, 34-second injection pipe, 35-second injection valve, 36-boosting pump, 37-second total flow meter, 38-boosting pump, 39-check valve, 4-circulation mechanism, 41-second discharge pipe, 42-solid-liquid separator, 43-circulation pump, 44-second discharge valve, 5-collection mechanism, 51-data collector, 52-computer. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] See also Figure 1 , Figure 1 It is a structural schematic diagram of an experimental device for simulating screen tube blockage and evaluating hydraulic pulse blockage removal in one embodiment of the present invention. The experimental device for simulating screen tube blockage and evaluating hydraulic pulse blockage removal comprises a simulation mechanism 1, an injection mechanism 2 and a blockage removal mechanism 3.

[0051] See also Figure 1-Figure 5The simulation mechanism 1 includes a plurality of simulation components 11, each simulation component 11 includes an upper sleeve 111, a slit sheet 112, a lower sleeve 113, an upper pressure sensor 114, a lower pressure sensor 115 and a branch flow meter 116, the upper sleeve 111 and the lower sleeve 113 are detachably connected, the slit sheet 112 is arranged between the upper sleeve 111 and the lower sleeve 113, a plurality of slits 1121 are formed on the slit sheet 112, and the widths and distances of the slits 1121 on the slit sheets 112 of each simulation component 11 are not equal, a water inlet 1111 is formed on the upper sleeve 111, a water outlet 1131 is formed on the lower sleeve 113, the upper pressure sensor 114 is arranged at the water inlet 1111, the lower pressure sensor 115 is arranged at the water outlet 1131, and the branch flow meter 116 is arranged at the water inlet 1111.

[0052] The injection mechanism 2 includes a liquid storage tank 21 and a mud pump 22 . The inlet of the mud pump 22 is connected to the outlet of the liquid storage tank 21 , and the outlet of the mud pump 22 can be selectively connected to or disconnected from the water inlet 1111 .

[0053] The unblocking mechanism 3 includes a water tank 31 and a pulse plunger pump 32 . The inlet of the pulse plunger pump 32 is connected to the outlet of the water tank 31 , and the outlet of the pulse plunger pump 32 can be selectively connected or disconnected with the water outlet 1131 .

[0054] The present invention also provides a simulated screen tube blockage and hydraulic pulse blockage removal evaluation experimental method, which is applicable to the simulated screen tube blockage and hydraulic pulse blockage removal evaluation experimental device, and comprises the following steps:

[0055] S1, preparing a sand-containing fluid with a preset sand concentration and storing it in a liquid storage tank 21;

[0056] S2, connect the outlet of the mud pump 22 with the water inlet 1111, disconnect the outlet of the pulse plunger pump 32 from the water outlet 1131, turn on the mud pump 22, the mud pump 22 sucks the sand-containing fluid in the liquid storage tank 21 to the water inlet 1111 of each upper sleeve 111, then passes through the slit sheet 112 and enters the lower sleeve 113, and finally discharges, and continuously monitors the pressure of the water inlet 1111 and the water outlet 1131 through the upper pressure sensor 114 and the lower pressure sensor 115, and at the same time, continuously monitors the flow of the water inlet 1111 through the branch flow meter 116;

[0057] S3. After the pressure is stable, the displacement of the mud pump 22 is changed to observe the pressure changes of the water inlet 1111 and the water outlet 1131 over time under different displacement conditions. Each time the pressure is adjusted to a certain displacement, it is stabilized for a period of time. After collecting multiple data points, the displacement is increased again.

[0058] S4, when the pressure difference between the water inlet 1111 and the water outlet 1131 exceeds a preset value, the mud pump 22 is stopped, the upper sleeves 111 and the lower sleeves 113 are disassembled, and the slit pieces 112 are taken out to observe the slit gap blockage, so as to compare the slit gap blockage under different slit width and distance conditions;

[0059] S5. Install each slit sheet 112 in the upper sleeve 111 and the lower sleeve 113 again, and connect the upper sleeve 111 and the lower sleeve 113, disconnect the outlet of the mud pump 22 from the water inlet 1111, connect the outlet of the pulse plunger pump 32 with the water outlet 1131, turn on the pulse plunger pump 32, and the pulse plunger pump 32 pumps water in the water tank 31 to the water outlet 1131. After the water enters the lower sleeve 113, it passes through the slit sheet 112 and is discharged from the upper sleeve 111, thereby flushing the sand particles blocking the slit sheet 112;

[0060] S6. After the pressure difference between the water inlet 1111 and the water outlet 1131 is stabilized, the permeability of the simulation component 11 is calculated, and then the pulse plunger pump 32 is turned off, and each upper sleeve 111 and the lower sleeve 113 are disassembled, and each slit sheet 112 is taken out to observe the unblocking of the slit gap; thereby comparing the unblocking of the slit sheet 112 under different slit widths and distances;

[0061] S7, changing the sand concentration or sand particle size of the prepared sand-containing fluid, repeating steps S1-S6, and obtaining the influence of the sand concentration or sand particle size on the blockage and unblocking of the slitting piece 112;

[0062] S8 . Change the pulse frequency or pulse amplitude of the pulse plunger pump 32 , and repeat steps S1 - S6 to obtain the effect of the pulse frequency or pulse amplitude on the unblocking of the slitting sheet 112 .

[0063] The technical solution provided by the present invention has the following beneficial effects: by setting up multiple groups of simulation components 11, the width and distance of the slits 1121 on the slit pieces 112 of each simulation component 11 are not equal, the sand-containing fluid in the liquid storage tank 21 is sucked to the water inlet 1111 of each upper sleeve 111 by the mud pump 22, and then passes through each slit piece 112, so as to simulate the blockage of the screen pipe with different slit widths and distances, and the water in the water tank 31 is sucked to the water outlet 1131 by the pulse plunger pump 32, and the water enters the lower sleeve 113 and passes through the slit piece 112. The slit piece 112 is then discharged from the upper sleeve 111, thereby flushing the sand particles blocking the slit piece 112, and the hydraulic pulse unblocking effect of the screen tube with different slit widths and distances can be simulated. By changing the sand concentration or sand particle size of the sand-containing fluid, the influence of the sand concentration or sand particle size on the blockage and unblocking of the slit piece 112 can be studied. By changing the pulse frequency or pulse amplitude of the pulse plunger pump 32, the influence of the pulse frequency or pulse amplitude on the unblocking of the slit piece 112 can be studied, thereby providing experimental data support for the determination of the pulsating unblocking process parameters.

[0064] In one embodiment, see Figure 1-Figure 4 The upper sleeve 111 is threadedly connected to the lower sleeve 113, and a retaining ring 1132 is provided on the inner wall of the lower sleeve 113. The lower end surface of the slit sheet 112 abuts against the retaining ring 1132, and the upper end surface of the slit sheet 112 abuts against the lower end surface of the upper sleeve, so that the slit sheet 112 can be clamped.

[0065] In one embodiment, see Figure 1-Figure 3 Each of the simulation components 11 further includes a water inlet branch pipe 117, one end of which is connected to the corresponding water inlet 1111, and the upper pressure sensor 114 and the branch flow meter 116 are both arranged on the water inlet branch pipe 117; the simulation mechanism 1 further includes a water inlet main pipe 12, one end of which is connected to the other end of each of the water inlet branch pipes 117, and the other end of the water inlet main pipe 12 is connected to the outlet of the mud pump 22. When in use, the mud pump 22 sucks the sand-containing fluid in the liquid storage tank 21 into the water inlet main pipe 12, and then discharges it from the water inlet main pipe 12 into each of the water inlet branch pipes 117, and then enters each of the water inlets 1111.

[0066] In one embodiment, see Figure 1-Figure 3 Each of the water inlet branch pipes 117 is provided with a water inlet branch valve 1171, so that the number of the water inlet branch pipes 117 to be used can be selected according to needs.

[0067] In one embodiment, see Figure 1-Figure 3The injection mechanism 2 further includes a first injection pipe 23, one end of which is in communication with the other end of the water inlet main pipe 12, the other end of which is in communication with the outlet of the mud pump 22, and a first injection valve 231 is provided on the first injection pipe 23. The unblocking mechanism 3 further includes a first discharge pipe 33, one end of which is in communication with the other end of the water inlet main pipe 12, and a first discharge valve 331 is provided on the first discharge pipe 33.

[0068] When in use, the first injection valve 231 is opened and the first discharge valve 331 is closed, so that the outlet of the mud pump 22 can be connected to the water inlet 1111.

[0069] In one embodiment, see Figure 1-Figure 3 The first injection pipe 23 is also provided with a safety valve 24 and a first total flow meter 25.

[0070] In one embodiment, see Figure 1-Figure 3 Each of the simulation components 11 further includes a water outlet branch pipe 118, one end of which is connected to the corresponding water outlet 1131, and the lower pressure sensor 115 is arranged on the corresponding water outlet branch pipe 118; the simulation mechanism 1 further includes a water outlet main pipe 13, one end of which is connected to the other end of each of the water outlet branch pipes 118, and the other end of the water outlet main pipe 13 is connected to the outlet of the pulse plunger pump 32. When in use, the pulse plunger pump 32 draws water in the water tank 31 to the water outlet main pipe 13, and then enters each water outlet 1131 through each water outlet branch pipe 118. After entering the lower sleeve 113, the water passes through the slit sheet 112 and is discharged from the upper sleeve 111, thereby flushing the sand particles blocking the slit sheet 112.

[0071] In one embodiment, see Figure 1-Figure 3The unblocking mechanism 3 also includes a second injection pipe 34, one end of which is connected to the other end of the water outlet main pipe 13, the other end of the second injection pipe 34 is connected to the outlet of the pulse plunger pump 32, and a second injection valve 35 is provided on the second injection pipe 34; the simulated screen pipe blockage and hydraulic pulse unblocking evaluation experimental device also includes a circulation mechanism 4, the circulation mechanism 4 includes a second discharge pipe 41, a solid-liquid separator 42 and a circulation pump 43, one end of the second discharge pipe 41 is connected to the other end of the water outlet main pipe 13, the second discharge pipe 41 is provided with a second discharge valve 44, the inlet of the solid-liquid separator 42 is connected to the other end of the second discharge pipe 41, the inlet of the circulation pump 43 is connected to the liquid outlet of the solid-liquid separator 42, and the outlet of the circulation pump 43 is connected to the liquid storage tank 21. When in use, the solid-liquid separator 42 separates the sand-containing fluid discharged from the second discharge pipe 41 into solid and liquid, and the liquid is sucked into the liquid storage tank 21 through the circulation pump 43 to achieve the recycling of the liquid, and the separated sand particles are also manually poured into the liquid storage tank 21, thereby ensuring that the sand concentration in the liquid storage tank 21 will not change significantly.

[0072] In one embodiment, see Figure 1-Figure 3 The second injection pipe 34 is also provided with a booster pump 36, a second total flow meter 37, a pressure-boosting pump 38 and a one-way valve 39, wherein the booster pump 36 is used to increase the water pressure, the second total flow meter 37 is used to measure the flow in the second injection pipe 34, the pressure-boosting pump 38 is used to supplement the pressure, thereby facilitating the adjustment of the water injection pressure, and the one-way valve 39 is used to control the flow direction of water.

[0073] In one embodiment, see Figure 1-Figure 3 The simulated screen tube blockage and hydraulic pulse unblocking evaluation experimental device also includes a collection mechanism 5, which includes a data collector 51 and a computer 52. The data collector 51 is electrically connected to each of the branch flow meters 116, each of the upper pressure sensors 114, each of the lower pressure sensors 115, the first total flow meter 25 and the second total flow meter 46, and the computer 52 is electrically connected to the data collector 51. This facilitates data collection.

[0074] In one embodiment, see Figure 1-Figure 3 In step S6, the permeability of the simulation component 11 is calculated by the flow rate collected by the branch flow meter 116, the detection pressure of the upper pressure sensor 114, the lower pressure sensor 115 and the gap parameter of the slit sheet 112, and the formula is:

[0075] k= QμL s

[0076] AΔP

[0077] Where k is the permeability of the simulated component 11, in μm 2 ; Q is the fluid flow rate collected by the branch flow meter 116, in m 3 / s; μ is the fluid viscosity, unit is Pa·s; L s is the thickness of the slit sheet 112, in m; A is the area of ​​the slit sheet 112, in m 2 ; ΔP is the pressure difference between the upper pressure sensor 114 and the lower pressure sensor 115, and the unit is Pa.

[0078] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail:

[0079] The experimental method for simulating screen tube blockage and hydraulic pulse blockage removal evaluation includes the following steps:

[0080] S1, preparing a sand-containing fluid with a preset sand concentration and storing it in a liquid storage tank 21;

[0081] S2, open the first injection valve 231 and the second discharge valve 44 and close the second injection valve 35 and the first discharge valve 331, turn on the mud pump 22, the mud pump 22 sucks the sand-containing fluid in the liquid storage tank 21 to the water inlet main pipe 12, and then discharges it from the water inlet main pipe 12 to each water inlet branch pipe 117, and then enters each water inlet 1111, and then passes through the slit sheet 112 and enters the lower sleeve 113, finally, the sand-containing fluid discharged from the lower sleeve 113 enters the second discharge pipe 41, the solid-liquid separator 42 performs solid-liquid separation on the sand-containing fluid discharged from the second discharge pipe 41, and the liquid is sucked to the liquid storage tank 21 through the circulation pump 43 to realize the recycling of the liquid, and the pressure of the water inlet 1111 and the water outlet 1131 is continuously monitored through the upper pressure sensor 114 and the lower pressure sensor 115, and at the same time, the flow rate of the water inlet 1111 is continuously monitored through the branch flow meter 116;

[0082] S3. After the pressure is stable, the displacement of the mud pump 22 is changed to observe the pressure changes of the water inlet 1111 and the water outlet 1131 over time under different displacement conditions. Each time the pressure is adjusted to a certain displacement, it is stabilized for a period of time. After collecting multiple data points, the displacement is increased again.

[0083] S4, when the pressure difference between the water inlet 1111 and the water outlet 1131 exceeds a preset value, the mud pump 22 is stopped, the upper sleeves 111 and the lower sleeves 113 are disassembled, and the slit pieces 112 are taken out to observe the slit gap blockage, so as to compare the slit gap blockage under different slit width and distance conditions;

[0084] S5, install each slit sheet 112 in the upper sleeve 111 and the lower sleeve 113 again, and connect the upper sleeve 111 and the lower sleeve 113, close the first injection valve 231 and the second discharge valve 44, open the second injection valve 35 and the first discharge valve 331, and start the pulse plunger pump 32. The pulse plunger pump 32 pumps the water in the water tank 31 to the water outlet main pipe 13, and then enters each water outlet 1131 through each water outlet branch pipe 118. After entering the lower sleeve 113, the water passes through the slit sheet 112 and is discharged from the upper sleeve 111, thereby flushing the sand particles blocking the slit sheet 112. The water discharged from the upper sleeve 111 is discharged from the first discharge pipe 33;

[0085] S6. After the pressure difference between the water inlet 1111 and the water outlet 1131 is stabilized, the permeability of the simulation component 11 is calculated, and then the pulse plunger pump 32 is turned off, and each upper sleeve 111 and the lower sleeve 113 are disassembled, and each slit sheet 112 is taken out to observe the unblocking of the slit gap; thereby comparing the unblocking of the slit sheet 112 under different slit widths and distances;

[0086] S7, changing the sand concentration or sand particle size of the prepared sand-containing fluid, repeating steps S1-S6, and obtaining the influence of the sand concentration or sand particle size on the blockage and unblocking of the slitting piece 112;

[0087] S8 . Change the pulse frequency or pulse amplitude of the pulse plunger pump 32 , and repeat steps S1 - S6 to obtain the effect of the pulse frequency or pulse amplitude on the unblocking of the slitting sheet 112 .

[0088] The technical solution provided by the present invention has the following beneficial effects: by setting up multiple groups of simulation components 11, the width and distance of the slits 1121 on the slit pieces 112 of each simulation component 11 are not equal, the sand-containing fluid in the liquid storage tank 21 is sucked to the water inlet 1111 of each upper sleeve 111 by the mud pump 22, and then passes through each slit piece 112, so as to simulate the blockage of the screen pipe with different slit widths and distances, and the water in the water tank 31 is sucked to the water outlet 1131 by the pulse plunger pump 32, and the water enters the lower sleeve 113 and passes through the slit piece 112. The slit piece 112 is then discharged from the upper sleeve 111, thereby flushing the sand particles blocking the slit piece 112, and the hydraulic pulse unblocking effect of the screen tube with different slit widths and distances can be simulated. By changing the sand concentration or sand particle size of the sand-containing fluid, the influence of the sand concentration or sand particle size on the blockage and unblocking of the slit piece 112 can be studied. By changing the pulse frequency or pulse amplitude of the pulse plunger pump 32, the influence of the pulse frequency or pulse amplitude on the unblocking of the slit piece 112 can be studied, thereby providing experimental data support for the determination of the pulsating unblocking process parameters.

[0089] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation, characterized in that: include: A simulation mechanism, wherein the simulation mechanism includes a plurality of simulation components, each of which includes an upper sleeve, a slit sheet, a lower sleeve, an upper pressure sensor, a lower pressure sensor and a branch flow meter, wherein the upper sleeve is detachably connected to the lower sleeve, the slit sheet is arranged between the upper sleeve and the lower sleeve, and a plurality of slits are formed on the slit sheet, and the width and distance of the slits on the slit sheets of each of the simulation components are not equal, the upper sleeve is provided with a water inlet, the lower sleeve is provided with a water outlet, the upper pressure sensor is arranged at the water inlet, the lower pressure sensor is arranged at the water outlet, and the branch flow meter is arranged at the water inlet; An injection mechanism, the injection mechanism comprising a liquid storage tank and a mud pump, the inlet of the mud pump is connected to the outlet of the liquid storage tank, and the outlet of the mud pump can be selectively connected to or disconnected from the water inlet; and, The unblocking mechanism comprises a water tank and a pulse plunger pump, the inlet of the pulse plunger pump is connected to the outlet of the water tank, and the outlet of the pulse plunger pump can be selectively connected or disconnected with the water outlet.

2. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 1, characterized in that: Each of the simulation components further includes a water inlet branch pipe, one end of which is connected to the corresponding water inlet, and the upper pressure sensor and the branch flow meter are both arranged on the water inlet branch pipe; The simulation mechanism further comprises a water inlet main pipe, one end of which is connected to the other end of each of the water inlet branches, and the other end of which is connected to the outlet of the mud pump.

3. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 2 is characterized in that: Each of the water inlet branch pipes is provided with a water inlet branch valve.

4. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 2, characterized in that: The injection mechanism further includes a first injection pipe, one end of which is connected to the other end of the water inlet main pipe, the other end of which is connected to the outlet of the mud pump, and a first injection valve is provided on the first injection pipe; The unblocking mechanism further includes a first discharge pipe, one end of which is connected to the other end of the water inlet main pipe, and a first discharge valve is provided on the first discharge pipe.

5. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 4 is characterized in that: The first injection pipe is also provided with a safety valve and a first total flow meter.

6. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 1, characterized in that: Each of the simulation components further includes a water outlet branch pipe, one end of which is connected to the corresponding water outlet, and the down pressure sensor is arranged on the corresponding water outlet branch pipe; The simulation mechanism also includes a water outlet main pipe, one end of which is connected to the other end of each of the water outlet branches, and the other end of the water outlet main pipe is connected to the outlet of the pulse plunger pump.

7. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 6, characterized in that: The unblocking mechanism further includes a second injection pipe, one end of which is connected to the other end of the water outlet main pipe, the other end of which is connected to the outlet of the pulse plunger pump, and a second injection valve is provided on the second injection pipe; The simulated screen pipe blockage and hydraulic pulse unblocking evaluation experimental device also includes a circulation mechanism, which includes a second discharge pipe, a solid-liquid separator and a circulation pump. One end of the second discharge pipe is connected to the other end of the water outlet main pipe, and a second discharge valve is provided on the second discharge pipe. The inlet of the solid-liquid separator is connected to the other end of the second discharge pipe, the inlet of the circulation pump is connected to the liquid outlet of the solid-liquid separator, and the outlet of the circulation pump is connected to the liquid storage tank.

8. The experimental device for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 1, characterized in that: It also includes a data collection mechanism, which includes a data collector and a computer. The data collector is electrically connected to each of the branch flow meters, each of the upper pressure sensors, and each of the lower pressure sensors, and the computer is electrically connected to the data collector.

9. A method for simulating screen tube blockage and evaluating hydraulic pulse blockage removal, applicable to the device for simulating screen tube blockage and evaluating hydraulic pulse blockage removal as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, preparing a sand-containing fluid with a preset sand concentration and storing it in a liquid storage tank; S2, connect the outlet of the mud pump with the water inlet, disconnect the outlet of the pulse plunger pump with the water outlet, turn on the mud pump, and the mud pump sucks the sand-containing fluid in the liquid storage tank to the water inlet of the upper sleeve, then passes through the slit sheet and enters the lower sleeve, and finally discharges, and continuously monitors the pressure of the water inlet and the water outlet through the upper pressure sensor and the lower pressure sensor, and at the same time, continuously monitors the flow of the water inlet through the branch flow meter; S3. After the pressure is stable, change the displacement of the mud pump and observe the changes of the pressure at the water inlet and outlet over time under different displacement conditions. Each time the displacement is adjusted to a certain level, it is stabilized for a period of time. After collecting multiple data points, the displacement is increased again. S4. When the pressure difference between the water inlet and the water outlet exceeds the preset value, the mud pump is stopped, the upper sleeve and the lower sleeve are disassembled, and the slit pieces are taken out to observe the slit gap blockage, so as to compare the slit gap blockage under different slit widths and distances; S5, reinstall each slit sheet in the upper sleeve and the lower sleeve, and connect the upper sleeve and the lower sleeve, disconnect the outlet of the mud pump from the water inlet, connect the outlet of the pulse plunger pump with the water outlet, turn on the pulse plunger pump, the pulse plunger pump pumps water in the water tank to the water outlet, the water enters the lower sleeve, passes through the slit sheet and is discharged from the upper sleeve, thereby flushing the sand particles blocking the slit sheet; S6. After the pressure difference between the water inlet and the water outlet is stable, the permeability of the simulated component is calculated, and then the pulse plunger pump is turned off, the upper sleeve and the lower sleeve are disassembled, and the slit pieces are taken out to observe the unblocking of the slit gap; thereby comparing the unblocking of the slit pieces under different slit widths and distances; S7, changing the sand concentration or sand particle size of the prepared sand-containing fluid, repeating steps S1-S6, and obtaining the influence of the sand concentration or sand particle size on the blocking and unblocking of the slit piece; S8, changing the pulse frequency or pulse amplitude of the pulse plunger pump, repeating steps S1-S6, and obtaining the influence of the pulse frequency or pulse amplitude on the unblocking of the slit sheet.

10. The experimental method for simulating screen tube blockage and hydraulic pulse blockage removal evaluation according to claim 9, characterized in that: In step S6, The permeability of the simulated component is calculated by the flow rate collected by the branch flow meter, the detection pressure of the upper pressure sensor and the lower pressure sensor, and the gap parameters of the slit sheet. The formula is: Where k is the permeability of the simulated component, in μm 2 ; Q is the fluid flow rate collected by the branch flow meter, in m 3 / s; μ is the fluid viscosity, unit is Pa·s; L s is the thickness of the slit sheet, in m; A is the area of ​​the slit, in m 2 ; ΔP is the pressure difference between the upper pressure sensor and the lower pressure sensor, in Pa.

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