CN114965226B - Device and method for measuring acidizing and plug removal performance of rock core - Google Patents
Device and method for measuring acidizing and plug removal performance of rock core Download PDFInfo
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- CN114965226B CN114965226B CN202210913865.1A CN202210913865A CN114965226B CN 114965226 B CN114965226 B CN 114965226B CN 202210913865 A CN202210913865 A CN 202210913865A CN 114965226 B CN114965226 B CN 114965226B
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- 239000011435 rock Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002253 acid Substances 0.000 claims abstract description 90
- 229920001971 elastomer Polymers 0.000 claims abstract description 37
- 238000004090 dissolution Methods 0.000 claims abstract description 30
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 49
- 239000002002 slurry Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002699 waste material Substances 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 230000020477 pH reduction Effects 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 230000001846 repelling effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 20
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007922 dissolution test Methods 0.000 abstract description 3
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229920005560 fluorosilicone rubber Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006557 surface reaction Methods 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a device and a method for measuring acidizing and unblocking performance of a rock core, and relates to the field of petroleum and natural gas exploration and development. The invention can carry out plugging test, can carry out acid dissolution plugging after the plugging test, accurately obtains the permeability of the rock core through the micro-flow measuring component in the acid dissolution and deblocking process, and enables the inner sliding cylinder to move forward along with the acid dissolution of the rock core through the specially designed rock core holder, thereby bearing partial confining pressure of the rubber sleeve for the rock core, avoiding the local collapse of the confining pressure rubber sleeve caused by the overlarge front end cavity of the rock core due to the acid dissolution of the rock core, preventing the uneven confining pressure acting on the rock core, and ensuring the data accuracy of the acid dissolution test process.
Description
Technical Field
The invention relates to the field of petroleum and natural gas exploration and development, in particular to a device and a method for measuring acidizing and plugging removal performance of a rock core.
Background
The well leakage is the most common underground complex problem in the current drilling process, is one of the main factors which restrict underground safety and influence the drilling progress to cause great increase of drilling cost, and is of great importance for realizing effective plugging of a leakage layer in time. The leakage control of the reservoir section not only needs to realize high-efficiency plugging in the drilling and completion process, but also needs to effectively remove a plugging zone after the drilling and completion so as to restore the seepage capability of a crack channel at a later stage and achieve the purpose of reservoir leakage plugging protection. Reservoir interval leak control and unblocking typically relies on acid soluble temporary blocking materials. In the plugging process, the acid-soluble temporary plugging material enters a stratum fracture, is retained and forms a plugging zone with certain strength, and then the acid liquor can dissolve the plugging zone in the plugging removal process. In the acid dissolution process, the reaction residues and the temporary plugging agent residues in the fracture can reduce the permeability of the rock core, which directly influences the development effect of a subsequent reservoir. Therefore, how to accurately measure the permeability of the rock core after the temporary plugging acidification experiment indoors has important significance for evaluating the plugging removal effect of the acid-soluble temporary plugging material, determining the plugging removal mechanism of the acid-soluble temporary plugging material and solving the difficult problem of both reservoir plugging and protection. However, the existing rock core acidizing and plugging removal performance measuring device still has several problems:
1. residual liquid of the acid solution-acid soluble substance contact surface reaction after the acid dissolution reaction cannot be timely removed, so that the concentration of the acid solution participating in the acid dissolution reaction is insufficient, and finally the overall acid dissolution rate of the rock sample is inaccurate;
2. in the actual acid dissolution working condition, the influence of the acid concentration reduction caused by the fact that acid liquor erodes stratum rocks and the complex acid-acid solution contact condition caused by the tortuous pore throats of the stratum rocks on the acid dissolution rate of a rock sample is not considered;
3. the shortening of the length of the rock sample after acid dissolution and the local collapse of the confining pressure rubber sleeve are not considered, so that the confining pressure loading is not uniform;
4. the high-temperature and high-pressure environment of the stratum cannot be simulated, and the reaction rate can be directly influenced by the temperature and pressure environment;
5. the flow velocity of the micro-flow liquid flowing out of the tail end of the rock sample cannot be accurately measured.
Disclosure of Invention
Aiming at the defects in the prior art, the device and the method for measuring the acidizing and plugging removal performance of the rock core provided by the invention solve the problem that the length of a rock sample is shortened after the rock sample is dissolved in acid in the conventional device for measuring the acidizing and plugging removal performance of the rock core.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the device comprises a pressurizing device, an acid-soluble temporary plugging slurry container, a clear water container, an acid liquid container, a core holder, a confining pressure device, a waste liquid container, a metering container and a micro-flow measuring component; the core holder comprises a front end inlet, a front end outlet and a rear end outlet;
the pressurizing device is connected with the acid-soluble temporary plugging slurry container through a first switch, the pressurizing device is connected with the acid liquid container through a fourth switch, the pressurizing device is connected with the clear water container, and the pressurizing device is connected with the front-end inlet through a third switch;
the clear water container is connected with the front end inlet through a second switch; the acid-soluble temporary plugging slurry container and the acid liquid container are respectively connected with the front-end inlet; the core holder is connected with the confining pressure device;
the front end outlet is connected with a waste liquid container through a fifth switch; the rear end outlet is respectively connected with the metering container and the micro-flow measuring component through a sixth switch; a first pressure gauge is arranged at the front end inlet, a second pressure gauge is arranged at the front end outlet, and a third pressure gauge is arranged at the rear end outlet;
the core holder comprises a front plug outer cylinder, a holder outer cylinder and a rear plug main body; the front end inlet and the front end outlet are both arranged on the front plug outer cylinder; the front plug outer cylinder is detachably connected with the holder outer cylinder through a front plug locking block; the rear plug main body is detachably connected with the outer cylinder of the clamp holder through a rear plug locking block; the rear end outlet penetrates through the rear plug main body;
the two ends of the inner side of the outer cylinder of the clamp holder are respectively provided with a first fixing table, a rubber sleeve is arranged between the two first fixing tables, and a confining pressure cavity is formed between the rubber sleeve and the outer cylinder of the clamp holder; an confining pressure cavity inlet communicated with the confining pressure cavity is formed in the outer cylinder of the clamp holder;
an inner sliding barrel is arranged in the front plug outer barrel and comprises a tail part, an inner cylinder and an outer cylinder, wherein the inner cylinder and the outer cylinder are fixed on the tail part; a hydraulic telescopic device for pushing the inner sliding barrel to slide is arranged between the tail part of the inner sliding barrel and the inner wall of the front plug outer barrel; the tail part of the inner sliding cylinder is provided with a through hole positioned between the inner cylinder and the outer cylinder; the front end inlet extends into the inner cylinder; the outer surface of the front end of the outer cylinder is contacted with the rubber sleeve; a rock core is placed between the outer cylinder and the rear plug main body; the front end of the outer cylinder is provided with a distance detector, the distance detector is electrically connected with the hydraulic telescopic equipment, and the hydraulic telescopic equipment is electrically connected with an upper computer.
Furthermore, a turbulent flow orifice plate is arranged at the front end of the inner cylinder, and a first rubber ring is arranged at the front end of the front end inlet;
the confining pressure device comprises a confining pressure oil groove and a confining pressure pump, the confining pressure pump is respectively connected with the confining pressure oil groove and a confining pressure cavity inlet, and a confining pressure meter is arranged at the confining pressure cavity inlet.
Furthermore, fan-shaped columns are distributed at one end, facing the core, of the rear plug main body, a flow collecting groove is formed between every two adjacent fan-shaped columns, and the flow collecting groove is connected with the rear-end outlet;
the front end of the sector column is provided with a temperature sensor which is connected with an upper computer through a signal wire penetrating through the rear plug main body; the outer surface of the outer cylinder of the clamp holder is sequentially provided with a heating layer and a heat preservation layer.
Furthermore, the hydraulic telescopic equipment comprises an equipment shell and a telescopic column, wherein second fixed tables are arranged on opposite surfaces of the equipment shell and the inner sliding cylinder, and two second fixed tables are respectively used for fixing two ends of a second rubber ring; the front end of the telescopic column is detachably connected with the inner sliding barrel.
Further, the micro-flow measuring component comprises an insulating liquid discharge pipe, and a micrometer main body is arranged on the outer surface of the insulating liquid discharge pipe; a piston is arranged in the insulating liquid discharge pipe, a rack is arranged on the back face of the piston, and the rack penetrates through the micrometer main body and drives the micrometer main body to record a numerical value.
Further, the distance detector comprises a first magnet, a second magnet and a detection cavity which is arranged in the outer cylinder and is parallel to the outer cylinder; the detection cavity is divided into a front cavity and a rear cavity by a partition plate, the front cavity is communicated with the outside, a first sliding groove is formed in the front cavity, a second sliding groove and an elastic component are formed in the rear cavity, and a first contact switch and a second contact switch are arranged in the second sliding groove; the first magnet is wrapped by an acid-resistant layer and a first sliding block, and the first sliding block is positioned in the first sliding groove;
a second sliding block is arranged on the second magnet and is positioned in the second sliding groove; the first contact switch is positioned at the front end of the second sliding block, the second contact switch is positioned at the rear end of the second sliding block, and the first contact switch and the second contact switch are respectively and electrically connected with the hydraulic telescopic equipment;
the elastic component is connected with the tail end of the second magnet; the first magnet and the second magnet are arranged in a repelling way; when the second sliding block is contacted with the second contact switch, the acid-resistant layer is longer than the inner sliding cylinder; the first contact switch generates a forward signal and the second contact switch generates a stop signal.
The method for measuring the acidizing and plugging removal performance of the rock core comprises a device for measuring the acidizing and plugging removal performance of the rock core and the following steps:
s1, placing a rock core in a rubber sleeve, combining a rock core holder, and closing all switches;
s2, plugging the rock core: opening the first switch to enable the sixth switch to be communicated with the rock core holder and the metering container, and enabling the acid-soluble temporary plugging slurry in the acid-soluble temporary plugging slurry container to enter the rock core holder through the pressurizing device until the liquid in the metering container reaches the set volume;
s3, closing the first switch, opening the third switch and the fifth switch, discharging acid-soluble temporary plugging slurry at the front end of the rock core, and closing the pressurizing equipment;
s4, opening the core holder, taking out the blocked core, and reassembling the core holder;
s5, closing the third switch, opening the second switch, and flushing the pipeline by the clean water in the clean water container through pressurizing equipment;
s6, opening the third switch, closing the sixth switch and the second switch, and ventilating the pipeline for a set time through pressurizing equipment;
s7, loading the blocked core into a core holder, and starting hydraulic telescopic equipment to enable the front end of the inner sliding cylinder to move to be in contact with the blocked core;
s8, acid dissolution and blockage removal: starting hydraulic telescopic equipment to enable the inner sliding barrel to move towards the plugged rock core, stopping the hydraulic telescopic equipment from stretching when the distance detector obtains a stop signal, and starting the hydraulic telescopic equipment to extend when the distance detector obtains a forward moving signal; applying confining pressure to the core holder through a confining pressure device; closing the third switch, opening the fourth switch, communicating the core holder and the micro-flow measuring component through the sixth switch, and enabling the acid liquor in the acid liquor container to enter the core holder through a pressurizing device; obtain the pressure value P of the first pressure gauge1Pressure value P of the second pressure gauge2And a firstPressure value P of three pressure gauges3Acquiring the liquid amount measured by the micro-flow measuring component; obtaining the first time after the hydraulic telescopic equipment stops extendingiElongation length in seconds
；
S9, according to a formula:
get the firstiCore permeability in seconds
Obtaining the acidizing and plugging removal performance of the rock core; wherein
The viscosity of the acid liquor is obtained;
as a micro-flow measuring partiThe amount of liquid measured in seconds;
as a micro-flow measuring parti-the amount of liquid measured at 1 second;
the core length is used;
is a constant;
the core diameter.
Further, the calculation formula of the liquid amount measured by the micro-flow rate measuring part in step S8 is:
wherein
The micrometer body is arranged at the secondiThe count in the time of the second is,
counting the initial number of the micrometer main body;Sthe internal cross-sectional area of the insulated drain.
The invention has the beneficial effects that:
1. the invention can carry out plugging test, can carry out acid dissolution plugging after the plugging test, accurately obtains the core permeability through the micro-flow measuring component in the acid dissolution and deblocking process, and enables the inner sliding cylinder to move forward along with the acid dissolution of the core through the specially designed core holder so as to bear partial confining pressure of the rubber sleeve for the core, thereby avoiding the local collapse of the confining pressure rubber sleeve caused by the overlarge cavity at the front end of the core due to the acid dissolution of the core, preventing the non-uniform confining pressure acting on the core and ensuring the data accuracy in the acid dissolution test process.
2. The method can timely remove the residual liquid of the acid solution-acid soluble contact surface reaction after the acid dissolution reaction, and avoids the problem of inaccurate acid dissolution rate measurement due to insufficient acid solution concentration participating in the acid dissolution reaction.
3. The invention can simulate various complex conditions such as acid concentration reduction caused by that acid liquor erodes stratum rock, complex contact condition of the acid liquor and acid soluble matters, blocking effect of rock sample acid soluble and fallen matters on a leakage channel and the like in the actual stratum rock core acid dissolution process, and better accords with the actual acid dissolution working condition.
4. The invention can simulate the acid dissolution reaction process in the high-temperature and high-pressure environment of the stratum, and can simulate more various stratum environments by changing the set temperature of the heating device and the set pump pressure of the confining pressure pump, thereby having stronger applicability.
5. The invention can accurately measure the flow velocity of micro-flow liquid flowing out of the tail end of the rock sample and can acquire the transient permeability in the whole experiment process. Not only can pay attention to the subtle phenomenon in the experimental process, but also can monitor the overall permeability change condition in the experimental process, and has important significance for improving the plugging and unplugging effects of the acid-soluble temporary plugging material and promoting the development of the plugging technology of the material.
6. The turbulent flow pore plate can be used for turbulent flow of acid liquor, so that direct scouring of the acid liquor on the core is avoided, and the contact between the acid liquor and the core is more uniform.
7. The first rubber ring can fill a gap between the front end inlet and the inner cylinder, so that liquid is prevented from flowing away from the gap between the front end inlet and the inner cylinder, and the contact rate of the liquid and the rock core is ensured.
8. The second rubber ring can seal the space between the hydraulic telescopic equipment and the inner sliding barrel, so that the telescopic column is prevented from being contacted with acid liquor, the hydraulic telescopic equipment is protected, and the hydraulic telescopic equipment can be repeatedly used for many times.
9. The arrangement of the sector columns and the collecting groove can provide drainage energy with a larger area on the basis of providing enough support for the rock core, and further the influence of the rear plug main body on the permeability of the rock core is reduced.
10. The temperature sensor can detect the temperature of the rock core, provide temperature regulation and control basic data for the heating layer and be convenient for maintain the corresponding temperature environment of the rock core.
11. The rack-driven (electronic) micrometer is used for recording data, the micrometer is used for recording the penetration depth of liquid, the precision is high, corresponding data can be obtained in real time in an electric signal mode, and the upper computer can conveniently acquire and draw the corresponding data.
12. The distance detector realizes isolation pushing through the magnets which are arranged in a repulsion mode, a partition plate is convenient to protect a rear end device, switch triggering is completed under the condition that the rear end is isolated from acid liquor, corresponding signals are provided for the work of hydraulic telescopic equipment, and the distance between the inner sliding cylinder and the rock core is always within a set value.
Drawings
FIG. 1 is a block diagram showing the construction of the present apparatus;
FIG. 2 is a schematic diagram of a core holder;
FIG. 3 is a schematic structural diagram between the hydraulic telescopic device and the inner sliding barrel;
FIG. 4 is a schematic structural view of a rear plug lock;
FIG. 5 is a schematic view showing the structure of a micro flow rate measuring section;
fig. 6 is a schematic view of the structure of the distance detector.
Wherein: 1. a pressurizing device; 2. a first switch; 3. acid-soluble temporary plugging of the slurry container; 4. a clear water container; 5. a second switch; 6. a third switch; 7. a fourth switch; 8. an acid liquor container; 9. a first pressure gauge; 10. a core holder; 11. a second pressure gauge; 12. a fifth switch; 13. a waste liquid container; 14. a confining pressure meter; 15. a confining pressure pump; 16. an oil confining pressure groove; 17. a third pressure gauge; 18. a sixth switch; 19. a metering container; 20. a micro flow rate measuring part; 21. a front plug outer cylinder; 22. a hydraulic telescopic device; 23. a through hole; 24. an inner slide cylinder; 25. a front plug locking block; 26. a clamper outer cylinder; 27. a confining pressure cavity; 28. a rubber sleeve; 29. a rear plug body; 30. a rear plug locking block; 31. a front end inlet; 32. a rear end outlet; 33. a core; 34. a turbulent flow orifice plate; 35. a front end outlet; 36. a first rubber ring; 37. an inlet of the confining pressure cavity; 38. a distance detector; 39. a first fixed table; 40. a temperature sensor; 41. a signal line; 42. a heating layer; 43. a heat-insulating layer; 44. a telescopic column; 45. a second stationary stage; 46. a second rubber ring; 47. a sector post; 48. a collecting groove; 49. an insulating drain pipe; 50. a piston; 51. a micrometer main body; 52. a rack; 59. a first chute; 60. a second chute; 61. a first magnet; 62. an acid resistant layer; 63. a first slider; 64. a partition plate; 65. a second magnet; 66. a first contact switch; 67. a second slider; 68. a second contact switch; 69. an elastic member; 70. a probe chamber.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 and fig. 2, the core acidizing plug removal performance measuring device comprises a pressurizing device 1, an acid-soluble temporary plug slurry container 3, a clear water container 4, an acid liquid container 8, a core holder 10, a confining pressure device, a waste liquid container 13, a metering container 19 and a micro-flow measuring component 20; the core holder 10 includes a front inlet 31, a front outlet 35, and a rear outlet 32;
the pressurizing device 1 is connected with the acid-soluble temporary plugging slurry container 3 through a first switch 2, the pressurizing device 1 is connected with an acid liquid container 8 through a fourth switch 7, the pressurizing device 1 is connected with a clear water container 4, and the pressurizing device 1 is connected with a front-end inlet 31 through a third switch 6;
the clear water container 4 is connected with the front end inlet 31 through a second switch 5; the acid-soluble temporary plugging slurry container 3 and the acid liquid container 8 are respectively connected with the front-end inlet 31; the core holder 10 is connected with a confining pressure device;
the front end outlet 35 is connected with the waste liquid container 13 through a fifth switch 12; the rear-end outlet 32 is connected with the metering container 19 and the micro-flow measuring component 20 through a sixth switch 18; a first pressure gauge 9 is arranged at the front end inlet 31, a second pressure gauge 11 is arranged at the front end outlet 35, and a third pressure gauge 17 is arranged at the rear end outlet 32;
the core holder 10 comprises a front plug outer cylinder 21, a holder outer cylinder 26 and a rear plug main body 29; the front end inlet 31 and the front end outlet 35 are both arranged on the front plug outer cylinder 21; the front plug outer cylinder 21 is detachably connected with the holder outer cylinder 26 through a front plug locking block 25; the rear plug main body 29 is detachably connected with the holder outer cylinder 26 through a rear plug locking block 30; the rear end outlet 32 penetrates through the rear plug body 29;
the two ends of the inner side of the outer gripper cylinder 26 are respectively provided with a first fixing table 39, a rubber sleeve 28 is arranged between the two first fixing tables 39, and a confining pressure cavity 27 is formed between the rubber sleeve 28 and the outer gripper cylinder 26; the clamp holder outer cylinder 26 is provided with a confining pressure cavity inlet 37 communicated with the confining pressure cavity 27;
an inner sliding cylinder 24 is arranged in the front plug outer cylinder 21, and the inner sliding cylinder 24 comprises a tail part, an inner cylinder and an outer cylinder which are fixed on the tail part; a hydraulic telescopic device 22 for pushing the inner sliding cylinder 24 to slide is arranged between the tail part of the inner sliding cylinder 24 and the inner wall of the front plug outer cylinder 21; the tail part of the inner sliding cylinder 24 is provided with a through hole 23 positioned between the inner cylinder and the outer cylinder; the front end inlet 31 extends into the inner cylinder; the outer surface of the front end of the outer cylinder is contacted with the rubber sleeve 28; a rock core 33 is arranged between the outer cylinder and the rear plug main body 29; the front end of the outer cylinder is provided with a distance detector 38, the distance detector 38 is electrically connected with the hydraulic telescopic equipment 22, and the hydraulic telescopic equipment 22 is electrically connected with an upper computer.
The front end of the inner cylinder is provided with a turbulent flow orifice plate 34, and the front end of the front end inlet 31 is provided with a first rubber ring 36;
the confining pressure device comprises a confining pressure oil groove 16 and a confining pressure pump 15, the confining pressure pump 15 is respectively connected with the confining pressure oil groove 16 and a confining pressure cavity inlet 37, and a confining pressure meter 14 is arranged at the confining pressure cavity inlet 37.
The structure of the back plug lock is shown in fig. 4. Fan-shaped columns 47 are distributed at one end of the rear plug main body 29 facing the rock core 33, a flow collecting groove 48 is formed between the adjacent fan-shaped columns 47, and the flow collecting groove 48 is connected with the rear end outlet 32. The front end of the sector column 47 is provided with a temperature sensor 40, and the temperature sensor 40 is connected with an upper computer through a signal wire 41 penetrating through the rear plug main body 29; the outer surface of the holder outer cylinder 26 is provided with a heating layer 42 and an insulating layer 43 in this order.
As shown in fig. 3, the hydraulic telescopic device 22 includes a device housing and a telescopic column 44, wherein second fixing platforms 45 are disposed on opposite surfaces of the device housing and the inner sliding cylinder 24, and two ends of a second rubber ring 46 are respectively fixed on the two second fixing platforms 45; the front end of the telescopic column 44 is detachably connected with the inner slide 24.
The structure of the micro-flow rate measuring part is as shown in fig. 5, the micro-flow rate measuring part 20 includes an insulating liquid discharge pipe 49, and a micrometer body 51 is provided on the outer surface of the insulating liquid discharge pipe 49; a piston 50 is arranged in the insulating drain pipe 49, a rack 52 is arranged on the back of the piston 50, and the rack 52 penetrates through the micrometer main body 51 and drives the micrometer main body 51 to record a numerical value.
The structure of the distance detector is shown in fig. 6, and the distance detector 38 comprises a first magnet 61, a second magnet 65, and a detection cavity 70 arranged in and parallel with the outer cylinder; the detection cavity 70 is divided into a front cavity and a rear cavity by a partition plate 64, the front cavity is communicated with the outside, a first sliding groove 59 is arranged in the front cavity, a second sliding groove 60 and an elastic component 69 are arranged in the rear cavity, and a first contact switch 66 and a second contact switch 68 are arranged in the second sliding groove 60; the first magnet 61 is wrapped by an acid-resistant layer 62 and a first sliding block 63, and the first sliding block 63 is positioned in the first sliding groove 59;
a second slide block 67 is arranged on the second magnet 65, and the second slide block 67 is positioned in the second sliding groove 60; the first contact switch 66 is positioned at the front end of the second slide block 67, the second contact switch 68 is positioned at the rear end of the second slide block 67, and the first contact switch 66 and the second contact switch 68 are respectively electrically connected with the hydraulic telescopic device 22;
the elastic member 69 is connected to the rear end of the second magnet 65; the first magnet 61 and the second magnet 65 are arranged to be repelled; when the second slider 67 is in contact with the second contact switch 68, the acid-resistant layer 62 is longer than the inner slide 24; the first contact switch 66 generates a advance signal and the second contact switch 68 generates a stop signal. The elastic member 69 may be a spring.
The method for measuring the acidizing and plugging removal performance of the rock core comprises a rock core acidizing and plugging removal performance measuring device and the following steps:
s1, placing a rock core 33 in a rubber sleeve 28, combining a rock core holder 10, and closing all switches;
s2, plugging the rock core 33: opening the first switch 2, enabling the sixth switch 18 to be communicated with the core holder 10 and the metering container 19, enabling the acid-soluble temporary plugging slurry body in the acid-soluble temporary plugging slurry body container 3 to enter the core holder 10 through the pressurizing device 1 until the liquid in the metering container 19 reaches a set volume (which can be set to be 20ml, and aims to enable the acid-soluble temporary plugging slurry body to fully pass through the core);
s3, closing the first switch 2, opening the third switch 6 and the fifth switch 12, discharging acid-soluble temporary plugging slurry at the front end of the rock core, and closing the pressurizing device 1 (in this way, no water residue exists in a pipeline between the acid liquid container 8 and the rock core holder 10, so that the acid liquid is prevented from being diluted, and meanwhile, the pipeline between the rock core holder 10 and the sixth switch 18 can be ensured to store water, so that the liquid flow can be monitored at the first time in the acid-soluble stage);
s4, opening the core holder 10, taking out the blocked core, and reassembling the core holder 10;
s5, closing the third switch 6, opening the second switch 5, and flushing the pipeline by the clean water in the clean water container 4 through the pressurizing equipment 1;
s6, opening the third switch 6, closing the sixth switch 18 and the second switch 5, and ventilating the pipeline to set time through the pressurizing equipment 1;
s7, loading the blocked rock core into the rock core holder 10, and starting the hydraulic telescopic equipment 22 to enable the front end of the inner sliding barrel 24 to move to be in contact with the blocked rock core;
s8, acid dissolution and blockage removal: starting the hydraulic telescopic equipment 22 to enable the inner sliding barrel 24 to move towards the plugged core, stopping the hydraulic telescopic equipment 22 from stretching when the distance detector 38 obtains a stop signal, and starting the hydraulic telescopic equipment 22 to extend when the distance detector 38 obtains an advance signal; applying confining pressure to the core holder 10 through confining pressure devices; closing the third switch 6, opening the fourth switch 7, communicating the core holder 10 and the micro-flow measuring component 20 through the sixth switch 18, and enabling the acid liquor in the acid liquor container 8 to enter the core holder 10 through the pressurizing device 1; obtain the pressure value P of the first pressure gauge 91Pressure value P of the second pressure gauge 112And the pressure value P of the third pressure gauge 173Obtaining the liquid amount measured by the micro-flow measuring part 20; obtaining hydraulic telescoping device 22 after first terminating extensioniElongation length in seconds
；
S9, according to a formula:
get the firstiCore permeability in seconds
Obtaining the acidizing and de-plugging performance of the rock core; wherein
The viscosity of the acid liquor is obtained;
for micro-flow measuring part 20iThe amount of liquid measured in seconds;
for micro-flow measuring part 20i-the amount of liquid measured at 1 second;
the core length is used;
is a constant;
the core diameter.
The calculation formula of the liquid amount measured by the micro-flow rate measuring part 20 in step S8 is:
wherein
The micrometer body 51 is at the secondiThe count in the time of the second is,
is the initial count of the micrometer body 51;Sthe internal cross-sectional area of the insulated drain 49.
In one embodiment of the present invention, a transmission member (e.g., a gear train) may be provided between the rack 52 and the micrometer body 51 to enlarge the range or increase the accuracy. The micrometer body 51 may be an electronic micrometer.
In a specific implementation process, in order to facilitate the detachment of the front plug lock 25 and the rear plug lock 30 from the holder outer cylinder 26, the holder outer cylinder 26 is respectively connected with the front plug lock 25 and the rear plug lock 30 in a threaded manner. The whole device is treated in an acid-resistant manner at the place where the whole device is contacted with the acid liquor, the relevant rubber sleeve or rubber ring can be an acid-resistant rubber ring, the acid-resistant rubber ring can be made of hydrogenated nitrile rubber or fluorosilicone rubber, and the ductility of the fluorosilicone rubber can completely meet the requirement of the telescopic column 44 on the stretching of the second rubber ring 46 in the stretching process. Other materials having acid resistance and high temperature resistance and corresponding ductility may also be used for the second rubber ring 46 or other rubber components in the present apparatus.
If the distance between the inner slide 24 and the core 33 needs to be controlled within Acm, the position of the second contact switch 68 is only required to be adjusted, so that when the second slide 67 triggers the first contact switch 66, the length of the foremost end of the acid-proof layer 62 exceeding the inner slide 24 is less than Acm. Meanwhile, in order to ensure that the inner slide 24 does not directly contact with the core 33, the position of the second contact switch 68 only needs to be adjusted, so that when the second slide 67 triggers the second contact switch 68, the foremost end of the acid-resistant layer 62 still exceeds the inner slide 24. In the initial state, the elastic member 69 will push the second magnet 65 forward, the second magnet 65 will push the first magnet 61 forward by magnetic force, and the elastic member 69 will make the second magnet 65 trigger the first contact switch 66 (the first start of the hydraulic telescopic device 22 in the initial state will be controlled by the upper computer). When the inner slide 24 moves forward, if the first magnet 61 contacts the core, the first magnet 61 pushes the second magnet 65 by magnetic force, so that the second slide 67 on the second magnet 65 leaves the first contact switch 66 and moves towards the second contact switch 68, and when the second slide 67 contacts the second contact switch 68, the hydraulic telescopic device 22 stops extending. When the core 33 is dissolved by acid, the first magnet 61 moves forwards, the second slide block 67 leaves the second contact switch 68 and moves towards the first contact switch 66 under the action of the elastic component 69 (the hydraulic telescopic equipment 22 keeps a stopped extension state) until the second slide block 67 triggers the first contact switch 66, the hydraulic telescopic equipment 22 starts to work and extend, and the process is repeated, so that the inner sliding barrel 24 can automatically track the core acid dissolution process. In the working process of the hydraulic telescopic equipment 22, the upper computer can be controlled at any time, and the damage of the equipment caused by the fault of the contact switch is avoided.
In the later period of acid dissolution, if the amount of the back end permeate of the core 33 increases or exceeds the range of the micro-flow measuring component 20, the sixth switch 18 can be switched to communicate the core holder 10 with the measuring container 19, and the flow rate can be counted by the measuring container 19.
In conclusion, the invention can perform a plugging test, can perform acid dissolution plugging after the plugging test, accurately acquire the permeability of the core through the micro-flow measuring component 20 in the acid dissolution and plugging process, and enable the inner sliding cylinder 24 to move forward along with the acid dissolution of the core through the specially designed core holder 10 to bear partial confining pressure of the rubber sleeve for the core, thereby avoiding the partial collapse of the confining pressure rubber sleeve caused by the overlarge front end cavity of the core due to the acid dissolution of the core, preventing the nonuniform confining pressure acting on the core and ensuring the data accuracy in the acid dissolution test process.
Claims (7)
1. A rock core acidification de-plugging performance measuring device is characterized by comprising a pressurizing device (1), an acid-soluble temporary plugging slurry container (3), a clear water container (4), an acid liquid container (8), a rock core holder (10), a confining pressure device, a waste liquid container (13), a metering container (19) and a micro-flow measuring component (20); the core holder (10) comprises a front end inlet (31), a front end outlet (35) and a rear end outlet (32);
the pressurizing device (1) is connected with the acid-soluble temporary plugging slurry container (3) through the first switch (2), the pressurizing device (1) is connected with the acid liquid container (8) through the fourth switch (7), the pressurizing device (1) is connected with the clear water container (4), and the pressurizing device (1) is connected with the front-end inlet (31) through the third switch (6);
the clear water container (4) is connected with the front-end inlet (31) through a second switch (5); the acid-soluble temporary plugging slurry container (3) and the acid liquid container (8) are respectively connected with the front end inlet (31); the core holder (10) is connected with a confining pressure device;
the front end outlet (35) is connected with the waste liquid container (13) through a fifth switch (12); the rear end outlet (32) is respectively connected with the metering container (19) and the micro-flow measuring component (20) through a sixth switch (18); a first pressure gauge (9) is arranged at the front end inlet (31), a second pressure gauge (11) is arranged at the front end outlet (35), and a third pressure gauge (17) is arranged at the rear end outlet (32);
the core holder (10) comprises a front plug outer cylinder (21), a holder outer cylinder (26) and a rear plug main body (29); the front end inlet (31) and the front end outlet (35) are both arranged on the front plug outer cylinder (21); the front plug outer cylinder (21) is detachably connected with the holder outer cylinder (26) through a front plug locking block (25); the rear plug main body (29) is detachably connected with the holder outer cylinder (26) through a rear plug locking block (30); the rear end outlet (32) penetrates through the rear plug main body (29);
first fixing platforms (39) are arranged at two ends of the inner side of the outer cylinder (26) of the clamp holder, a rubber sleeve (28) is arranged between the two first fixing platforms (39), and a confining pressure cavity (27) is formed between the rubber sleeve (28) and the outer cylinder (26) of the clamp holder; a confining pressure cavity inlet (37) communicated with the confining pressure cavity (27) is arranged on the clamp holder outer cylinder (26);
an inner sliding cylinder (24) is arranged in the front plug outer cylinder (21), and the inner sliding cylinder (24) comprises a tail part, an inner cylinder and an outer cylinder which are fixed on the tail part; a hydraulic telescopic device (22) for pushing the inner sliding cylinder (24) to slide is arranged between the tail part of the inner sliding cylinder (24) and the inner wall of the front plug outer cylinder (21); the tail part of the inner sliding cylinder (24) is provided with a through hole (23) positioned between the inner cylinder and the outer cylinder; the front end inlet (31) extends into the inner cylinder; the outer surface of the front end of the outer cylinder is contacted with a rubber sleeve (28); a rock core (33) is arranged between the outer cylinder and the rear plug main body (29); the front end of the outer cylinder is provided with a distance detector (38), the distance detector (38) is electrically connected with the hydraulic telescopic equipment (22), and the hydraulic telescopic equipment (22) is electrically connected with an upper computer;
the distance detector (38) comprises a first magnet (61), a second magnet (65) and a detection cavity (70) which is arranged in the outer cylinder and is parallel to the outer cylinder; the interior of the detection cavity (70) is divided into a front cavity and a rear cavity by a partition plate (64), the front cavity is communicated with the outside, a first sliding groove (59) is arranged in the front cavity, a second sliding groove (60) and an elastic component (69) are arranged in the rear cavity, and a first contact switch (66) and a second contact switch (68) are arranged in the second sliding groove (60); the first magnet (61) is wrapped by an acid-resistant layer (62) and a first sliding block (63), and the first sliding block (63) is positioned in the first sliding groove (59);
a second sliding block (67) is arranged on the second magnet (65), and the second sliding block (67) is positioned in the second sliding groove (60); the first contact switch (66) is positioned at the front end of the second sliding block (67), the second contact switch (68) is positioned at the rear end of the second sliding block (67), and the first contact switch (66) and the second contact switch (68) are respectively and electrically connected with the hydraulic telescopic equipment (22);
the elastic component (69) is connected with the tail end of the second magnet (65); the first magnet (61) and the second magnet (65) are arranged in a repelling way; when the second slider (67) is in contact with the second contact switch (68), the acid-resistant layer (62) is longer than the inner slide cylinder (24); the first contact switch (66) generates a forward signal and the second contact switch (68) generates a stop signal.
2. The core acidizing plug removal performance measuring device is characterized in that a turbulent flow pore plate (34) is arranged at the front end of the inner cylinder, and a first rubber ring (36) is arranged at the front end of a front end inlet (31);
the confining pressure device comprises a confining pressure oil groove (16) and a confining pressure pump (15), the confining pressure pump (15) is respectively connected with the confining pressure oil groove (16) and a confining pressure cavity inlet (37), and a confining pressure meter (14) is arranged at the confining pressure cavity inlet (37).
3. The core acidizing plug removal performance measuring device is characterized in that fan-shaped columns (47) are distributed at one end, facing the core (33), of the rear plug body (29), a flow collecting groove (48) is formed between every two adjacent fan-shaped columns (47), and the flow collecting groove (48) is connected with the rear end outlet (32);
the front end of the sector column (47) is provided with a temperature sensor (40), and the temperature sensor (40) is connected with an upper computer through a signal wire (41) penetrating through the rear plug main body (29); the outer surface of the clamp holder outer cylinder (26) is sequentially provided with a heating layer (42) and a heat preservation layer (43).
4. The core acidizing plug removal performance measuring device according to claim 1, wherein the hydraulic telescopic equipment (22) comprises an equipment shell and a telescopic column (44), second fixing tables (45) are arranged on opposite surfaces of the equipment shell and the inner sliding barrel (24), and two ends of a second rubber ring (46) are respectively fixed by the two second fixing tables (45); the front end of the telescopic column (44) is detachably connected with the inner sliding barrel (24).
5. The device for measuring the acidizing and plug removal performance of the rock core according to the claim 1, wherein the micro-flow measuring component (20) comprises an insulating liquid drainage pipe (49), and a micrometer main body (51) is arranged on the outer surface of the insulating liquid drainage pipe (49); a piston (50) is arranged in the insulating liquid discharge pipe (49), a rack (52) is arranged on the back of the piston (50), and the rack (52) penetrates through the micrometer main body (51) and drives the micrometer main body (51) to record a numerical value.
6. A method for measuring the acidizing and plugging removal performance of a rock core comprises the device for measuring the acidizing and plugging removal performance of the rock core according to any one of claims 1 to 5, and is characterized by comprising the following steps:
s1, placing a rock core (33) in a rubber sleeve (28), combining a rock core holder (10), and closing all switches;
s2, plugging the rock core (33): opening the first switch (2), enabling the sixth switch (18) to be communicated with the rock core holder (10) and the metering container (19), and enabling the acid-soluble temporary plugging slurry in the acid-soluble temporary plugging slurry container (3) to enter the rock core holder (10) through the pressurizing equipment (1) until the liquid in the metering container (19) reaches a set volume;
s3, closing the first switch (2), opening the third switch (6) and the fifth switch (12), discharging acid-soluble temporary plugging slurry at the front end of the rock core (33), and closing the pressurizing equipment (1);
s4, opening the core holder (10), taking out the blocked core, and reassembling the core holder (10);
s5, closing the third switch (6), opening the second switch (5), and flushing the pipeline by the clean water in the clean water container (4) through the pressurizing equipment (1);
s6, opening the third switch (6), closing the sixth switch (18) and the second switch (5), and ventilating the pipeline to set time through the pressurizing equipment (1);
s7, loading the blocked rock core into a rock core holder (10), and starting hydraulic telescopic equipment (22) to enable the front end of an inner sliding barrel (24) to move to be in contact with the blocked rock core;
s8, acid dissolution and blockage removal: starting a hydraulic telescopic device (22) to enable an inner sliding barrel (24) to move towards the plugged core, stopping the hydraulic telescopic device (22) from stretching when a stopping signal is obtained by a distance detector (38), and starting the hydraulic telescopic device (22) to extend when the distance detector (38) obtains a forward moving signal; applying confining pressure to the core holder (10) through a confining pressure device; closing the third switch (6), opening the fourth switch (7), communicating the core holder (10) and the micro-flow measuring component (20) through the sixth switch (18), and enabling the acid liquor in the acid liquor container (8) to enter the core holder (10) through the pressurizing device (1); obtaining a pressure value P of a first pressure gauge (9)1A pressure value P of a second pressure gauge (11)2And a pressure value P of a third pressure gauge (17)3Acquiring the liquid amount measured by the micro-flow measuring part (20); obtaining the hydraulic telescopic device (22) after the first termination of the elongationiElongation length in seconds
；
S9, according to a formula:
get the firstiCore permeability in seconds
Obtaining the acidizing and plugging removal performance of the rock core; wherein
The viscosity of the acid liquor is obtained;
for micro-flow measuring parts (20)iThe amount of liquid measured in seconds;
is a micro-flow measuring part (20)i-the amount of liquid measured at 1 second;
the core length is used;
is a constant;
the core diameter.
7. The method for measuring the acidizing and plugging removal performance of the rock core according to the claim 6, wherein the formula for calculating the liquid volume measured by the micro-flow measurement component (20) in the step S8 is as follows:
wherein
The micrometer body (51) is arranged at the second positioniThe count in the time of the second is,
is the initial count of the micrometer body (51);Sthe internal cross-sectional area of the insulated drain pipe (49).
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158122A (en) * | 2015-08-13 | 2015-12-16 | 中国石油大学(北京) | Device and method for testing temporary blocking performance of temporary blocking and diverting agent for acid fracturing |
| CN207557066U (en) * | 2017-12-21 | 2018-06-29 | 北京宝沃石油技术有限责任公司 | A kind of pilot system for considering temperature and core permeability gradients affect being blocked to diverting agent |
| CN109707353A (en) * | 2018-12-03 | 2019-05-03 | 中国石油集团川庆钻探工程有限公司 | Downhole hydraulic pulsation S3Sour unblocking and injection increasing experimental provision and method |
| CN110018101A (en) * | 2019-04-11 | 2019-07-16 | 中海石油(中国)有限公司 | A kind of mechanical experiment system for shock wave de-plugging evaluation |
| CN112858130A (en) * | 2019-11-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Device and method for measuring damage rate of temporary plugging agent to reservoir permeability |
| CN113092338A (en) * | 2021-04-09 | 2021-07-09 | 中国石油天然气股份有限公司 | Device and method for evaluating continuous plugging performance of diverting acid |
| CN113640467A (en) * | 2021-08-09 | 2021-11-12 | 中国石油化工集团有限公司 | Method for evaluating plugging and plugging removal effects of plugging material |
| CN114152555A (en) * | 2022-02-09 | 2022-03-08 | 成都理工大学 | Drilling fluid leakage damage simulation device and method |
| CN114459974A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for stability of acid fracturing high-temperature temporary plugging agent |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044273B (en) * | 2017-04-07 | 2018-06-22 | 中国石油大学(华东) | Sand control pit shaft blocking-de-plugging integration evaluation experimental simulator and method |
| CN111929170B (en) * | 2020-08-11 | 2023-08-15 | 成都劳恩普斯科技有限公司 | Device and method for evaluating pressure-bearing performance of temporary plugging material for fracture acidizing |
| CN111879903A (en) * | 2020-09-02 | 2020-11-03 | 西南石油大学 | Shunting agent shunting effect testing device and method for acid treatment |
| BR102020022705A2 (en) * | 2020-11-06 | 2022-05-17 | Petróleo Brasileiro S.A. - Petrobras | Laser heating system in carbonate rock acidification tests |
-
2022
- 2022-08-01 CN CN202210913865.1A patent/CN114965226B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158122A (en) * | 2015-08-13 | 2015-12-16 | 中国石油大学(北京) | Device and method for testing temporary blocking performance of temporary blocking and diverting agent for acid fracturing |
| CN207557066U (en) * | 2017-12-21 | 2018-06-29 | 北京宝沃石油技术有限责任公司 | A kind of pilot system for considering temperature and core permeability gradients affect being blocked to diverting agent |
| CN109707353A (en) * | 2018-12-03 | 2019-05-03 | 中国石油集团川庆钻探工程有限公司 | Downhole hydraulic pulsation S3Sour unblocking and injection increasing experimental provision and method |
| CN110018101A (en) * | 2019-04-11 | 2019-07-16 | 中海石油(中国)有限公司 | A kind of mechanical experiment system for shock wave de-plugging evaluation |
| CN112858130A (en) * | 2019-11-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Device and method for measuring damage rate of temporary plugging agent to reservoir permeability |
| CN114459974A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for stability of acid fracturing high-temperature temporary plugging agent |
| CN113092338A (en) * | 2021-04-09 | 2021-07-09 | 中国石油天然气股份有限公司 | Device and method for evaluating continuous plugging performance of diverting acid |
| CN113640467A (en) * | 2021-08-09 | 2021-11-12 | 中国石油化工集团有限公司 | Method for evaluating plugging and plugging removal effects of plugging material |
| CN114152555A (en) * | 2022-02-09 | 2022-03-08 | 成都理工大学 | Drilling fluid leakage damage simulation device and method |
Non-Patent Citations (1)
| Title |
|---|
| 可酸溶固化堵漏材料的封堵及储层保护性能;张浩;《油田化学》;20201225;581-586 * |
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