CN110485999B - Simulation crack module, crack type drilling fluid leaking stoppage testing arrangement - Google Patents
Simulation crack module, crack type drilling fluid leaking stoppage testing arrangement Download PDFInfo
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- CN110485999B CN110485999B CN201910568658.5A CN201910568658A CN110485999B CN 110485999 B CN110485999 B CN 110485999B CN 201910568658 A CN201910568658 A CN 201910568658A CN 110485999 B CN110485999 B CN 110485999B
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- 238000005553 drilling Methods 0.000 title claims abstract description 33
- 239000012530 fluid Substances 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 20
- 239000011435 rock Substances 0.000 claims abstract description 21
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 13
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 27
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 15
- 239000000706 filtrate Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 9
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 235000019580 granularity Nutrition 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 10
- 238000002474 experimental method Methods 0.000 abstract description 9
- 230000003746 surface roughness Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000000571 coke Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
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- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a simulation crack module and a crack type drilling fluid plugging testing device. The invention relates to a drilling fluid plugging test technology, which comprises the following steps: the fracture simulation module comprises two identical semi-cylindrical components, wherein the two semi-cylindrical components are detachably connected, a sealing groove is arranged between the two semi-cylindrical components, two rubber sealing strips for sealing are arranged in the sealing groove, the fracture section of the simulation fracture module is a rectangular groove, the depth of the groove is in deep-shallow gradual transition, and the edge of the groove is provided with scale marks for marking the fracture width of different positions of the groove along the length direction of the groove; the bottom of the groove is provided with an artificial sand surface for simulating a rough surface of a stratum rock fracture. The method can simulate the surface roughness of cracks with different lithology, and after the plugging experiment is completed, the simulated crack module is opened, the distribution form of the plugging agent of the plugging layer can be directly observed, and the width of the crack matched with the plugging slurry or the plugging agent and the plugging effect of the crack can be rapidly and accurately measured.
Description
Belongs to the technical field of:
the invention relates to a drilling fluid leaking stoppage testing technology, in particular to a simulated fracture module and a fracture type drilling fluid leaking stoppage testing device.
Background
In the drilling construction of oil and gas wells, the complex conditions of fracture-type leakage in the well are often met, expensive drilling fluid is consumed, and the drilling cost is increased along a long drilling period. The common leak stopping method for treating fracture type leakage is to add various inorganic or organic leak stopping materials with matched shapes and particle sizes into the drilling fluid, after the leak stopping agent carried by the leak stopping slurry leaks into stratum, the rigid coarse particles bridge in the fracture to form a plugging layer foundation, the medium particles are filled, the fine particles are plugged to form a plugging layer, and the bentonite and weighting agent particles in the drilling fluid cover the plugging layer under the filtering action to form a more compact mud cake, thereby preventing the leakage of the drilling fluid. The particle size of the bridging particles must be matched with the width of the crack, and the leakage stoppage can be caused by the excessive thickness and the excessive thinness of the particle size. The research of indoor plugging experiments and the evaluation of plugging effects are key technical means for screening plugging agents and are also scientific bases for carrying out bridging plugging construction on site.
The current commonly used means for evaluating the crack type plugging effect is to adopt a QD-2 plugging material test device. The device for evaluating the leaking stoppage effect simulates cracks with different widths by adopting artificial crack joint plates with different joint widths, and because the width of the cracks is uniform and the length is only 5cm, and the material of a simulated leaking layer is steel, the crack surface is smooth, the difference between the crack surface and the rough surface of sandstone, conglomerate and mudstone which are leaked in a crack type is large, the real condition of the crack leakage cannot be simulated well, the device represents that during a leaking stoppage experiment, if a plugging agent does not enter into the crack and a false blockage is formed at the joint, if the plugging agent passes through the crack and the leaking stoppage fails, the blocking condition of the plugging agent in the crack cannot be reflected, and the leaking stoppage effect of the plugging agent is difficult to be evaluated accurately.
Aiming at the characteristics, the dawn and the like change the surface roughness by lengthening the length of the crack module and sticking abrasive paper or metal sheets with different types and shapes in the module to ensure that the crack module is closer to the actual crack surface roughness, but the crack module is still fixed in the crack width, and the problems of false blockage at the crack opening part or no standing in the crack and failure of leakage stoppage exist in the plugging agent or the crack opening part.
The invention content is as follows:
the first purpose of the invention is to provide a simulated crack module which has the advantages of gradual crack width change, readability and adjustable roughness and is close to the shape of a real crack surface.
The second purpose of the invention is to provide a fracture type drilling fluid plugging testing device which can simulate the surface roughness of fractures with different lithology, and after the plugging experiment is finished, a simulated fracture module is opened, so that the distribution form of a plugging agent in a plugging layer can be directly observed, and the width of the fracture matched with plugging slurry or the plugging agent and the plugging effect of the fracture can be rapidly and accurately measured.
In order to achieve the purpose, the invention provides the following technical scheme:
a simulated fracture module, comprising: the fracture simulation module comprises two identical semi-cylindrical components, wherein the two semi-cylindrical components are detachably connected, a sealing groove is arranged between the two semi-cylindrical components, two rubber sealing strips for sealing are arranged in the sealing groove, the fracture section of the simulation fracture module is a rectangular groove, the depth of the groove is in deep-shallow gradual transition, and the edge of the groove is provided with scale marks for marking the fracture width of different positions of the groove along the length direction of the groove; the bottom of the groove is provided with an artificial sand surface for simulating a rough surface of a stratum rock fracture.
Further, the width of the crack comprises a first gradual change mode and a second gradual change mode;
the first gradual change mode comprises that the width of the crack is gradually changed from 6mm to 1mm, and the inclination of the bottom surface of the groove is 0.70-0.75 degrees;
the second gradual mode comprises that the width of the crack is gradually changed from 10mm to 4mm, and the inclination of the bottom surface of the groove is 0.84-0.88 degrees.
Further, the artificial sand surface comprises rock particles of different sizes bonded to the bottom of the groove, wherein the rock particles comprise one or both of quartz sand particles and limestone particles.
Further, the granularity of the rock particles can be selected from one of 20-40 meshes, 40-60 meshes, 60-100 meshes and 100-200 meshes.
Furthermore, the thickness of the artificial sand surface is 0.8-1.0 mm.
Further, the two semi-cylindrical members are connected by a dowel pin and a screw.
A crack type drilling fluid leakage stoppage testing device comprises a base, a sleeve cover, a ball valve and the crack simulation module; the base is connected with ground, the base can be dismantled with the sleeve and be connected, the sleeve top and the both ends intercommunication of bottom form and are used for holding the sleeve of test drilling fluid and hold the chamber, the sleeve top is provided with open-top and can dismantle with the cover sleeve and be connected, the cover sleeve top is provided with and holds the stop valve that the chamber communicates with the sleeve, the stop valve other end passes through gas-supply pipe and gas cylinder intercommunication, the sleeve bottom is provided with the liquid outlet and can dismantle with the ball valve and be connected, telescopic one end is kept away from to the ball valve is connected with the simulation crack module.
Further, the base is in threaded connection with the sleeve and locked by the screw; and/or the sleeve cover is in threaded connection with the top of the sleeve.
Further, the ball valve both ends are provided with first internal thread and second internal thread respectively, the outer wall of liquid outlet be provided with first internal thread complex first external screw thread and with first female connection, the simulation crack module be provided with second internal thread complex second external screw thread and with second female connection, and second external screw thread and second internal thread are provided with and are used for sealed second sealing washer.
Further, still including leaking thick liquid bucket and keeping away from the filtrating collection device that the one end of ball valve is connected with simulation crack module, the one end that simulation crack module was kept away from to filtrating collection device is provided with filtrating collection mouth, leaks thick liquid bucket and is used for receiving to leak thick liquid as for filtrating collection mouth lower extreme.
The invention has the following advantages: the fracture width of the simulated fracture module provided by the embodiment of the invention is gradually changed, and the simulated fracture module is readable and adjustable in roughness and is close to the fracture surface form of a real fracture, and the fracture type drilling fluid plugging testing device comprises the simulated fracture module, so that the plugging effect of plugging slurry and the fracture width matched with a plugging agent can be rapidly and accurately measured, a reliable experimental basis is provided for the optimization of the drilling fluid plugging agent and the design of a plugging scheme, and the simulated fracture module has very important indoor research and engineering application values.
Drawings
FIG. 1 is a schematic structural view of a fracture-type drilling fluid plugging testing device according to the present invention;
FIG. 2 is a schematic structural diagram of a simulated fracture module according to the present invention;
FIG. 3 is a cross-sectional view of a simulated fracture module of the present invention;
FIG. 4 is a cross-sectional view of a simulated fracture module of the present invention;
FIG. 5 is a cross-sectional view of a simulated fracture module of the present invention.
In the figure: 100-a simulated fracture module; 101-a sleeve; 102-a ball valve; 103-sleeve cover; 104-a stop valve; 105-a high pressure gas cylinder; 106-pulp leaking barrel; 107-second internal threads; 108-test drilling fluid; 109-filtrate collection means; 110-rubber sealing strips; 111-graduation mark; 113-a third external thread; 114-a second external thread; 116-a connection assembly; 117-semi-cylindrical members.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of protection of the invention is not limited to the following.
As shown in fig. 1-5, a fracture type drilling fluid plugging testing device comprises a base, a sleeve 101, a sleeve cover 103, a ball valve 102 and a simulated fracture module 100. A simulated fracture module 100 comprising: the two identical semi-cylindrical members 117 are made of metal in this embodiment, and may be made of plastic or inorganic material in other embodiments of the present invention. In this embodiment, the two semi-cylindrical members 117 are connected by inserting a positioning pin and a screw rod into the connecting assembly 116, in other embodiments of the present invention, the two semi-cylindrical members 117 may also be connected in other detachable connection manners, a sealing groove is provided between the two semi-cylindrical members 117, two rubber sealing strips 110 for sealing are provided in the sealing groove, the fracture section of the simulated fracture module 100 is a rectangular groove, the depth of the groove is in a gradual transition from deep to shallow, and the edge of the groove is provided with a scale mark 111 for marking the fracture width at different positions of the groove along the length direction of the groove; the internal cracks of the crack module can be divided into a smooth metal surface and rock roughness surfaces simulating different lithologies, an artificial sand surface for simulating the rough surfaces of the stratum rock cracks is arranged at the bottom of the groove, and in a preferred embodiment of the invention, the artificial sand surface is arranged at the bottom of the groove in a bottom surface laying mode.
The width of the crack comprises a first gradual change mode and a second gradual change mode; the first gradual change mode comprises that the width of the crack is gradually changed from 6mm to 1mm, and the inclination of the bottom surface of the groove is 0.70-0.75 degrees; in this embodiment, in the first gradual change mode, the inclination of the bottom surface of the groove is 0.72 °, taking a module in which the width of the crack gradually changes from 6mm to 1mm as an example, 6mm, 5mm, 4mm, 3mm, 2mm, and 1mm are engraved at the corresponding position of the width of the crack, and after the plugging experiment, the width of the crack matched with the plugging slurry or the plugging agent can be read according to the position of the plugging layer on the scale mark 111.
The second transition pattern included a transition of the slit width from 10mm to 4mm and a slope of the groove bottom surface of 0.84-0.88 deg., and in this embodiment, the slope of the groove bottom surface was 0.86 deg. in the second transition pattern.
The artificial sand surface comprises rock particles of different sizes bonded to the bottom of the groove, wherein the rock particles comprise one or both of quartz sand particles and limestone particles. The thickness of the artificial sand surface is 0.8-1.0 mm. The combination of the rock particles and the metal surface at the bottom of the groove with the cross section of the crack is bonded by a chemical adhesive, the specific method is that the metal surface at the bottom of the groove is uniformly coated with the chemical adhesive, then the rock particles are uniformly spread on the chemical adhesive and uniformly pressed by a steel plate ruler, after the rock particles are solidified, the redundant unconsolidated sand grains are swept, and the thickness of the sand grain coating of the layer is 1 mm.
The granularity of the rock particles can be selected from one of 20-40 meshes, 40-60 meshes, 60-100 meshes and 100-200 meshes, and the lithology of coarse sandstone, medium sandstone, fine sandstone, mudstone, limestone and the like is simulated respectively.
A testing device for leak stoppage of fractured drilling fluid comprises a base, a sleeve 101, a sleeve cover 103, a ball valve 102 and a simulated fracture module 100; the base is connected with ground, the base can be dismantled with sleeve 101 and be connected, sleeve 101 top and the both ends intercommunication of bottom form and are used for holding the sleeve 101 of test drilling fluid 108 and hold the chamber, sleeve 101 top is provided with open-top and can dismantle with sleeve cover 103 and be connected, sleeve cover 103 top is provided with holds the stop valve 104 that the chamber communicates with sleeve 101, the stop valve 104 other end passes through gas-supply pipe and 105 intercommunications with high-pressure gas cylinder, sleeve 101 bottom is provided with the liquid outlet and can dismantle with ball valve 102 and be connected, the one end that sleeve 101 was kept away from to ball valve 102 is connected with simulation crack module 100.
The base is in threaded connection with the sleeve 101 and locked by a screw; and/or, sleeve cap 103 is threadably coupled to the top of sleeve 101.
The ball valve 102 both ends are provided with first internal thread and second internal thread 107 respectively, the outer wall of liquid outlet be provided with first internal thread complex first external screw thread and with first female connection, the simulation crack module 100 be provided with second internal thread 107 complex second external screw thread 114 and with second internal thread 107 be connected, and second external screw thread 114 and second internal thread 107 are provided with and are used for the sealed second sealing washer.
The simulated fracture simulation system is characterized by further comprising a slurry leakage barrel 106 and a filtrate collecting device 109 in threaded connection with one end, far away from the ball valve 102, of the simulated fracture module 100, wherein one end, far away from the simulated fracture module 100, of the filtrate collecting device 109 is provided with a filtrate collecting port, and the slurry leakage barrel 106 is used for receiving slurry leakage at the lower end of the filtrate collecting port. In this embodiment, the end of the simulated fracture module 100 away from the ball valve 102 is provided with a third external thread 113 for detachable connection with the internal thread of the filtrate collection device 109.
In this embodiment, the test procedure is described by taking the simulated crack module 100 (the gradual change width is gradually changed from 6mm to 1mm) with different roughness crack surfaces as an example: in the experiment, coke particles and rubber powder with different meshes are selected as plugging materials to prepare the plugging drilling fluid; the simulated fracture module 100 is installed and fixed by bolts, one end of the simulated fracture module 100 is connected with the ball valve 102, the other end of the simulated fracture module is connected with the filtrate collecting device 109, the ball valve 102 is closed, the prepared leaking stoppage drilling fluid is added, the sleeve cover 103 is covered, the high-pressure gas cylinder 105 is connected and pressurized to 0.7MPa, and the filtrate leakage barrel 106 is arranged at the lower end of a filtrate collecting port.
The instantaneous leakage amount refers to the amount of mud instantaneously leaked when the ball valve 102 is opened under the pressure of 0.7MPa, and the forming capacity of the instantaneous plugging layer of the plugging mud is evaluated.
The total leakage amount refers to the accumulated leakage amount obtained by starting timing after the ball valve 102 is opened and increasing the pressure to 6MPa (5min) according to 1MPa/min, and evaluating the compactness of the plugging layer.
The pressure bearing capacity of the plugging layer is that the pressure is increased from 0.7MPa to 6MPa and during the pressure stabilization of 6MPa, the leakage quantity is not suddenly amplified, the pressure bearing capacity is considered to be more than or equal to 6MPa, and the compressive strength of the plugging layer is evaluated.
The breakdown pressure of the blocking layer is that the pressure is regarded as the breakdown pressure of the blocking layer when the leakage quantity of a certain pressure is suddenly amplified in the boosting process. In this case, the pressure-bearing capacity of the plug layer is < the breakdown pressure.
The matching of the plugging agent with the width of the crack means that after the plugging experiment is finished, the simulation crack module 100 is opened, and the reading of the width scale at the foremost end of the plugging layer is read, namely the average width of the crack which can be plugged by the plugging agent. The test results are shown in table one below. The model in the surface is the smooth degree of the inner wall of the crack model, the smooth model is a smooth metal wall surface, the model 1 is a model which adopts 40-60 meshes of rigid rock particles to simulate the rock gap surface, and the model 2 is a model which adopts 60-100 meshes of rigid rock particles to simulate the rock gap surface. The plugging position in the table is the position of the plugging material forming the plugging layer in the simulation gap, namely the distances from the end with gradually changed simulation crack width to the rearmost end and the foremost end of the plugging layer respectively.
The formula of the plugging material is as follows: 3% of coke A, 2% of coke B, 2% of coke C, 2% of coke D, 2% of coke E and 3% of rubber powder, wherein the mesh number of the coke is as follows: a (4-6 mesh), B (6-10 mesh), C (10-20 mesh), D (20-40 mesh) and E (40-100 mesh).
Surface-drilling fluid fracture plugging performance test
The experiment result shows that under the same pressure condition, the crack roughness is different, the influence on the experiment effect is larger, and the analysis of the plugging layer formed in the crack can show that the content of the fine particles in the plugging layer formed in a smooth mode is obviously reduced because the plugging layer is not tightly combined with the smooth crack surface, and the fine particles penetrate through the plugging layer, so that the accumulated leakage amount is obviously increased. On the contrary, the rough crack surface can hang a plurality of fine particles, so that the plugging layer is tightly combined with the crack surface, the plugging layer is more compact, and the plugging effect is better. The plugging performance of the plugging agent on the formation fracture can be more truly reflected. Meanwhile, the gradual change type simulated crack module 100 is adopted, the crack width of the bridge plug formed by the leaking stoppage material system can be clearly tested in a reaction mode, the crack width range of 1mm-6mm (or 4mm-10mm) can be measured by using one simulated crack module 100, the leaking stoppage module does not need to be frequently replaced like a traditional leaking stoppage testing device, the working efficiency is improved, and meanwhile the cost is saved.
The invention has the following advantages: the fracture width of the simulated fracture module 100 provided by the embodiment of the invention is gradually changed, and the readable and roughness adjustable, and is close to the fracture surface form of a real fracture, and the fracture type drilling fluid plugging testing device comprises the simulated fracture module 100, so that the plugging effect of plugging slurry and the fracture width matched with a plugging agent can be rapidly and accurately measured, a reliable experimental basis is provided for the optimization of the drilling fluid plugging agent and the design of a plugging scheme, and the simulated fracture module 100 has very important indoor research and engineering application values.
Claims (6)
1. A simulated fracture module, comprising: the method comprises the following steps: the crack simulation module comprises two same semi-cylindrical components, wherein the two same semi-cylindrical components are detachably connected, a sealing groove is arranged between the two semi-cylindrical components, two rubber sealing strips for sealing are arranged in the sealing groove, the section of a crack of the crack simulation module is a rectangular groove, the depth of the groove is in deep-shallow gradual transition, and the edge of the groove is provided with scale lines for marking the width of the crack at different positions of the groove along the length direction of the groove; the bottom of the groove is provided with an artificial sand surface for simulating a rough surface of a stratum rock fracture; the width of the crack comprises a first gradual change mode and a second gradual change mode;
the first gradual change mode comprises that the width of the crack is gradually changed from 6mm to 1mm, and the inclination of the bottom surface of the groove is 0.70-0.75 degrees;
the second gradual change mode comprises the steps that the width of the crack is gradually changed from 10mm to 4mm, and the inclination of the bottom surface of the groove is 0.84-0.88 degrees; the artificial sand surface comprises rock particles with different granularities, which are bonded with the bottom of the groove, and the rock particles comprise one or two of quartz sand particles and limestone particles; the granularity of the rock particles is one of 20-40 meshes, 40-60 meshes, 60-100 meshes or 100-200 meshes; the thickness of the artificial sand surface is 0.8-1.0 mm.
2. The simulated fracture module of claim 1, wherein two of said semi-cylindrical members are connected by a dowel pin and a threaded rod.
3. A crack type drilling fluid leakage stoppage testing device is characterized by comprising a base, a sleeve cover, a ball valve and the simulated crack module as claimed in any one of claims 1-2, wherein the base is connected with the ground, the base is detachably connected with the sleeve, two ends of the top and the bottom of the sleeve are communicated and form a sleeve accommodating cavity for accommodating a testing drilling fluid, the top of the sleeve is provided with a top opening and is detachably connected with the sleeve cover, the top of the sleeve cover is provided with a stop valve communicated with the sleeve accommodating cavity, the other end of the stop valve is communicated with a high-pressure gas cylinder through a gas pipe, the bottom of the sleeve is provided with a liquid outlet and is detachably connected with the ball valve, and one end, far away from the sleeve, of the ball valve is connected with the simulated crack module.
4. The fractured drilling fluid plugging testing device according to claim 3, wherein the base is in threaded connection with the sleeve and locked by a screw; and/or the sleeve cover is in threaded connection with the top of the sleeve.
5. The crack type drilling fluid leakage stoppage testing device as claimed in claim 3, wherein one end of the ball valve is provided with a first internal thread, the other end of the ball valve is provided with a second internal thread, the outer wall of the liquid outlet is provided with a first external thread which is matched with the first internal thread and is connected with the first internal thread, the simulated crack module is provided with a second external thread which is matched with the second internal thread and is connected with the second internal thread, and the second external thread and the second internal thread are provided with a second sealing ring for sealing.
6. The fractured drilling fluid plugging testing device according to claim 3, further comprising a slurry leaking barrel and a filtrate collecting device connected to one end of the simulated fracture module, which is far away from the ball valve, wherein one end of the filtrate collecting device, which is far away from the simulated fracture module, is provided with a filtrate collecting port, and the slurry leaking barrel is arranged at the lower end of the filtrate collecting port and used for receiving leaked slurry.
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| CN111561281B (en) * | 2020-05-08 | 2022-04-29 | 中国海洋石油集团有限公司 | Drilling fluid leak protection leaking stoppage effect evaluation experiment system |
| CN112326886B (en) * | 2020-11-02 | 2022-12-23 | 四川省地质矿产勘查开发局四0三地质队 | Multi-mode test drilling plugging test device and test method |
| CN112360390B (en) * | 2020-11-11 | 2021-09-14 | 中国石油大学(北京) | Dynamic crack plugging evaluation experimental device and experimental method thereof |
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