CN111341191A - Dense gas reservoir fracturing fluid loss damage simulation device and method - Google Patents
Dense gas reservoir fracturing fluid loss damage simulation device and method Download PDFInfo
- Publication number
- CN111341191A CN111341191A CN201811556849.1A CN201811556849A CN111341191A CN 111341191 A CN111341191 A CN 111341191A CN 201811556849 A CN201811556849 A CN 201811556849A CN 111341191 A CN111341191 A CN 111341191A
- Authority
- CN
- China
- Prior art keywords
- fracturing fluid
- gas
- core
- intermediate container
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
Landscapes
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a tight gas reservoir fracturing fluid loss damage simulation device and a method, wherein the tight gas reservoir fracturing fluid loss damage simulation device comprises: the device comprises a gas intermediate container, a fracturing fluid intermediate container, a pressure reducing device and a rock core fixing device; the core fixing device is provided with a closed containing cavity for containing a core; one end of the core fixing device is provided with an inlet pipe orifice and an outlet pipe orifice which are respectively communicated with the accommodating cavity; the outlet of the gas intermediate container is communicated with the pipe inlet; the other end of the core fixing device is provided with a circulating pipe orifice, the inlet end of the circulating pipe orifice is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice is communicated with the inner cavity of the gas intermediate container; the export of container and advance the mouth of pipe intercommunication in the middle of the fracturing fluid to make the fracturing fluid from advancing the mouth of pipe and entering into to the holding chamber in to the rock core simulation fracturing injury, pressure relief device and play mouth of pipe intercommunication for the pressure of balanced holding intracavity, thereby effectively avoided the condition emergence that the simulation in-process rock core is lost heart, reduced simulation error to a certain extent.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a device and a method for simulating filtration damage of fracturing fluid of a compact gas reservoir.
Background
The Tarim basin in the western China is an important natural gas production area in China, and a gas reservoir in the region has the characteristics of deep reservoir burial, high temperature and high pressure, great thickness, compact matrix and crack development, belongs to a typical crack type compact sandstone reservoir, but has low natural yield of a single well and needs reservoir transformation measures.
At present, the single well yield is mainly improved through hydraulic fracturing, namely, a ground high-pressure pump is utilized to squeeze fracturing fluid with certain performance into an oil layer through a shaft, when the speed of injecting the fracturing fluid exceeds the absorption capacity of the oil layer, very high pressure is formed on the oil layer at the bottom of a well, when the pressure exceeds the fracture pressure of rock of the oil layer near the bottom of the well, the oil layer is pressed open and cracks are generated, then the fracturing fluid is continuously squeezed into the oil layer, and the cracks are continuously expanded into the oil layer; after fracturing is completed, injected fracturing fluid can be automatically degraded and discharged out of a shaft, one or more cracks with different lengths, widths and heights are left in an oil layer, and a new fluid channel is established between the oil layer and the shaft; in high pressure reservoirs, however, higher net fracture pressure is required to keep the fracture open and extended due to the higher pressure of the formation itself, and, at this time, even in the stratum with extremely low permeability, the fracturing fluid can easily enter the stratum through the artificial crack to cause the permeability damage and the mechanical damage of the invasion zone of the fracturing fluid, thereby directly reducing the width of the crack and causing the reduction of the construction effect, the research on the damage of fracturing fluid filtration of the high-temperature high-pressure low-permeability gas reservoir is particularly important, the simulation research is carried out on the fracturing fluid filtration device in the prior art, the device specifically comprises a formation air pressure simulation module and a fracturing fluid simulation fracturing damage module, specifically, a rock core to be tested is put into the formation air pressure simulation module to make the gas saturation of the rock core consistent with that of the rock core in the formation, and then taking out the rock core from the stratum air pressure simulation module and putting the rock core into a fracturing fluid simulation fracturing injury module.
However, in the prior art, in the process of moving the core from the formation air pressure simulation module to the fracturing fluid simulation fracture damage module, the core is exposed in the air, so that the core is deflated, and the simulation result error is larger.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a compact gas reservoir fracturing fluid loss damage simulation device and method, which effectively avoid the occurrence of core gas leakage in the simulation process and reduce the simulation error to a certain extent.
In order to achieve the above object, in a first aspect, the present invention provides a tight gas reservoir fracturing fluid loss injury simulator, including: the device comprises a gas intermediate container containing gas, a fracturing fluid intermediate container containing fracturing fluid, a pressure reducing device and a rock core fixing device;
the core fixing device is provided with a closed accommodating cavity for accommodating a core; one end of the core fixing device is provided with an inlet pipe orifice and an outlet pipe orifice which are respectively communicated with the accommodating cavity;
a gas outlet of the gas intermediate container is communicated with the pipe inlet so that the gas enters the accommodating cavity from the pipe inlet; the other end of the core fixing device is provided with a circulating pipe orifice, the inlet end of the circulating pipe orifice is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice is communicated with the inner cavity of the gas intermediate container, so that gas entering the accommodating cavity flows back to the gas intermediate container from the circulating pipe orifice;
and a fracturing fluid outlet of the fracturing fluid intermediate container is communicated with the pipe inlet so that the fracturing fluid enters the accommodating cavity from the pipe inlet to perform simulated fracturing damage on the rock core, and the pressure reducing device is communicated with the pipe outlet and is used for receiving the fracturing fluid which is discharged from the pipe outlet and performs simulated fracturing damage on the rock core and balancing the pressure in the accommodating cavity.
In an embodiment of the present invention, the core fixing apparatus includes: the clamp holder comprises a clamp holder shell, wherein a clamping rubber cylinder is arranged in the clamp holder shell, and an inner cavity of the clamping rubber cylinder is formed into an accommodating cavity;
and the clamping rubber cylinder is also provided with a clamping structure for clamping the rock core.
Therefore, the core to be measured can be effectively ensured to be always in a closed environment, and air leakage is prevented.
In an embodiment of the present invention, the clamping structure includes: the left plunger and the right plunger are respectively arranged at two ends of the clamping rubber cylinder, and the pipe inlet and the pipe outlet are formed in the left plunger; the opening of the circulating pipe is arranged on the right plunger; the core is clamped between the left plunger and the right plunger;
the outer end of left side plunger with right side plunger is equipped with left plunger fixed cover and right plunger fixed cover respectively, left side plunger fixed cover with right plunger fixed cover all with the holder casing meets, is used for compressing tightly left side plunger with right plunger.
The left plunger and the right plunger are arranged at the two ends of the clamping rubber cylinder, so that the core can be clamped in the transverse direction, a closed simulation environment can be formed, and the air leakage condition in the simulation process is prevented; simultaneously, the outer ends of the left plunger and the right plunger are respectively provided with a left plunger fixing cover and a right plunger fixing cover, so that the rock core can be further clamped.
In an embodiment of the invention, the left plunger fixing cover is sleeved at one end of the gripper shell, the right plunger fixing cover is sleeved at the other end of the gripper shell, the left plunger fixing cover is provided with a first thread, one end of the gripper shell is provided with a second thread which is matched and connected with the first thread, the right plunger fixing cover is provided with a third thread, and the other end of the gripper shell is provided with a fourth thread which is matched and connected with the third thread;
the left plunger fixing cover is provided with a first through hole for the left plunger to pass through, and the left plunger is in sealing fit with the hole wall of the first through hole; the right plunger fixing cover is provided with a second through hole for the right plunger to pass through, and the right plunger is in sealing fit with the hole wall of the second through hole.
Through threaded connection in order to realize being connected between left plunger fixed cover and the holder casing, not only convenient to detach, but also can further strengthen the clamping effect to the rock core in horizontal.
In one embodiment of the invention, the clamp further comprises a confining pressure pump connected to the clamp shell;
the confining pressure pump is used for pressing the clamping rubber cylinder in the radial direction of the clamping rubber cylinder so as to enable the clamping rubber cylinder to clamp the core in the radial direction.
This can play certain clamping effect to the rock core in the radial direction.
In one embodiment of the invention, the injection device further comprises a first injection pump;
the output end of the first injection pump is respectively communicated with the inlet end of the gas intermediate container and the inlet end of the fracturing fluid intermediate container so as to press gas in the gas intermediate container into the accommodating cavity from the pipe inlet opening, or press fracturing fluid in the fracturing fluid intermediate container into the accommodating cavity from the pipe inlet opening.
Through setting up first syringe pump can effectively guarantee that gas and fracturing fluid enter into the holding chamber from advancing the mouth of a pipe to the core is aerifyd and is fractured the injury in simulating.
In an embodiment of the invention, a first pressure sensor for detecting a first end surface of the core is arranged at the pipe inlet, a second pressure sensor for detecting a second end surface of the core is arranged at the other end of the core fixing device, and the first pressure sensor and the second pressure sensor are respectively and electrically connected with the first injection pump.
The pressure values at the two ends of the rock core are detected, so that the pressurization and the decompression can be conveniently adjusted according to actual conditions in the simulation process.
In one embodiment of the invention, the pressure reduction device comprises a second syringe pump and a second syringe pump intermediate container;
the inlet end of the middle container of the second injection pump is communicated with the pipe outlet, and the outlet end accommodated in the middle of the second injection pump is communicated with the second injection pump;
and the second injection pump is used for pumping the fracturing fluid which is used for simulating fracturing damage to the rock core in the accommodating cavity into a middle container of the second injection pump.
Therefore, the pressure of the fracturing fluid discharged from the outlet pipe opening can be reduced, and the simulation device can be ensured to be in a dynamic constant pressure state all the time in the fracturing damage process, so that the fracturing damage process in the stratum can be simulated more truly.
In an embodiment of the invention, the core fixing device further comprises a heating box, the core fixing device is positioned in the heating box, and the heating box is used for heating the core fixing device;
and the gas intermediate container is filled with gas.
The tight gas reservoir fracturing fluid loss damage simulation device provided by the invention is provided with a gas intermediate container, a fracturing fluid intermediate container, a pressure reducing device and a rock core fixing device to form a closed simulation module; the rock core fixing device is provided with a closed containing cavity for containing the rock core, one end of the rock core fixing device is provided with an inlet pipe orifice and an outlet pipe orifice which are respectively communicated with the containing cavity, wherein outlets of a gas intermediate container and a fracturing fluid intermediate container are respectively communicated with the inlet pipe orifice, and in the specific simulation process, a gas outlet of the gas intermediate container can be firstly communicated with the inlet pipe orifice, so that gas enters the containing cavity from the inlet pipe orifice, and the saturation of the gas in the rock core in the containing cavity is consistent with the gas saturation of the rock core in the stratum; then the outlet of the gas intermediate container is closed, the outlet of the fracturing fluid intermediate container is communicated with the pipe inlet, so that the fracturing fluid enters the accommodating cavity from the pipe inlet to simulate fracturing damage to the rock core, and the rock core does not need to be taken out in the whole simulation experiment process, so that the gas leakage condition in the process of moving the rock core from the formation gas pressure simulation module to the fracturing fluid simulation fracturing damage module is effectively avoided, and the simulation error is reduced; in addition, the other end of the core fixing device is provided with a circulating pipe orifice, the inlet end of the circulating pipe orifice is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice is communicated with the inner cavity of the gas intermediate container, so that gas entering the accommodating cavity can flow back to the gas intermediate container from the circulating pipe orifice, the recycling rate of the gas is improved, and the core fixing device is energy-saving and environment-friendly; in addition, because the outlet pipe orifice of the rock core fixing device is communicated with the pressure reducing device, the pressure of the fracturing fluid discharged from the outlet pipe orifice can be reduced, and the dynamic constant pressure state of the simulated fracturing damage process can be maintained, so that the fracturing damage process in the stratum can be simulated more truly.
In a second aspect, the present invention provides a tight gas reservoir fracturing fluid loss injury simulation method, comprising:
putting a core to be tested into an accommodating cavity of a core fixing device;
filling gas in the gas intermediate container into the accommodating cavity through a pipe inlet of the core fixing device so that the core absorbs the gas until the saturation of the gas in the core is consistent with that of the core in the stratum;
and pressing the fracturing fluid in the fracturing fluid intermediate container into the accommodating cavity through the pipe inlet so as to enable the fracturing fluid to simulate fracturing damage to the rock core, and discharging the fracturing fluid after simulating fracturing damage to a pressure reducing device through the pipe outlet of the rock core fixing device.
The invention provides a tight gas reservoir fracturing fluid loss damage simulation method, which comprises the steps of placing a rock core to be tested into a tight gas reservoir fracturing fluid loss damage simulation device, and then arranging a gas intermediate container, a fracturing fluid intermediate container, a pressure reducing device and a rock core fixing device to form a closed simulation module; the rock core fixing device is provided with a closed containing cavity for containing the rock core, one end of the rock core fixing device is provided with an inlet pipe orifice and an outlet pipe orifice which are respectively communicated with the containing cavity, wherein outlets of a gas intermediate container and a fracturing fluid intermediate container are respectively communicated with the inlet pipe orifice, and in the specific simulation process, a gas outlet of the gas intermediate container can be firstly communicated with the inlet pipe orifice, so that gas enters the containing cavity from the inlet pipe orifice, and the saturation of the gas in the rock core in the containing cavity is consistent with the gas saturation of the rock core in the stratum; then the outlet of the gas intermediate container is closed, the outlet of the fracturing fluid intermediate container is communicated with the pipe inlet, so that the fracturing fluid enters the accommodating cavity from the pipe inlet to simulate fracturing damage to the rock core, and the rock core does not need to be taken out in the whole simulation experiment process, so that the gas leakage condition in the process of moving the rock core from the formation gas pressure simulation module to the fracturing fluid simulation fracturing damage module is effectively avoided, and the simulation error is reduced; in addition, the other end of the core fixing device is provided with a circulating pipe orifice, the inlet end of the circulating pipe orifice is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice is communicated with the inner cavity of the gas intermediate container, so that gas entering the accommodating cavity can flow back to the gas intermediate container from the circulating pipe orifice, the recycling rate of the gas is improved, and the core fixing device is energy-saving and environment-friendly; in addition, because the outlet pipe orifice of the rock core fixing device is communicated with the pressure reducing device, the pressure of the fracturing fluid discharged from the outlet pipe orifice can be reduced, and the dynamic constant pressure state of the simulated fracturing damage process can be maintained, so that the fracturing damage process in the stratum can be simulated more truly.
The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a holder in the tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a core fixing device in the tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a tight gas reservoir fracturing fluid loss damage simulation method according to an embodiment of the present invention.
Description of reference numerals:
1-a first syringe pump;
2-a pressure reduction device;
21-a second syringe pump;
22-second syringe pump intermediate reservoir;
3-gas intermediate container;
4-fracturing fluid intermediate container;
5-saturated gas bottle;
6, enclosing and pressing the pump;
7-heating box;
8, a rock core fixing device;
81-a gripper housing;
811-clamping the rubber cylinder;
812 — confining pressure pump inlet;
82-left plunger;
821-inlet pipe mouth;
822-outlet pipe orifice;
83-right plunger;
84-a circulation pipe orifice;
85-left plunger piston fixing cover;
86-right plunger fixing cover;
9-core;
10-a piston;
11 — a first pressure sensor;
12 — a second pressure sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The first embodiment is as follows:
fig. 1 is a schematic structural diagram of a tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a holder in the tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention. Fig. 3 is a schematic structural diagram of a core fixing device in the tight gas reservoir fracturing fluid loss damage simulation apparatus according to an embodiment of the present invention.
Referring to fig. 1 to 3, the present embodiment provides a tight gas reservoir fracturing fluid loss damage simulation apparatus, including: the device comprises a gas intermediate container 3 containing gas, a fracturing fluid intermediate container 4 containing fracturing fluid, a pressure reducing device 2 and a rock core fixing device 8.
The core fixing device 8 has a closed accommodating cavity for accommodating the core 9, and one end of the core fixing device 8 has a pipe inlet 821 and a pipe outlet 822 which are respectively communicated with the accommodating cavity.
The gas outlet of the gas intermediate container 3 is communicated with the pipe inlet 821 so that gas enters the accommodating cavity from the pipe inlet 821; in addition, the other end of the core fixing device 8 is provided with a circulating pipe orifice 84, the inlet end of the circulating pipe orifice 84 is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice 84 is communicated with the inner cavity of the gas intermediate container 3, so that the gas entering the accommodating cavity flows back to the gas intermediate container 3 from the circulating pipe orifice 84.
Specifically, a piston 10 may be disposed inside the gas intermediate container 3, one side of the piston 10 contains water, and the other side contains gas, specifically, one side close to the inlet 821 contains gas, and one side far from the inlet 821 contains water; in the specific implementation process, the gas outlet of the gas intermediate container 3 is communicated with the pipe inlet 821, so that gas enters the accommodating cavity from the pipe inlet 821 to saturate gas in the core 9 clamped in the accommodating cavity, and in the process, as the other end of the core fixing device 8 is provided with the circulating pipe orifice 84, the gas in the accommodating cavity can flow back to the gas intermediate container 3 through the circulating pipe orifice 84, the gas can be recycled, the utilization rate is improved, and the energy conservation and the environmental protection are realized.
A fracturing fluid outlet of the fracturing fluid intermediate container 4 is communicated with the pipe inlet 821 so that the fracturing fluid enters the accommodating cavity from the pipe inlet 821 to perform simulated fracturing damage on the rock core 9; in addition, the pressure reducing device 2 is communicated with the outlet 822 and is used for receiving fracturing fluid which is discharged from the outlet 822 and used for simulating fracturing damage to the rock core 9 and balancing the pressure in the accommodating cavity.
Specifically, a piston 10 may be disposed inside the fracturing fluid intermediate container 4, one side of the piston 10 contains water, and the other side contains fracturing fluid, specifically, one side close to the inlet 821 contains fracturing fluid, and one side far from the inlet 821 contains water; in the specific implementation process, after the gas saturation of the core 9 is consistent with that of the core in the stratum, the gas outlet of the gas intermediate container 3 is closed, the outlet of the fracturing fluid intermediate container 4 is communicated with the pipe inlet 821, and the pressure reducing device is opened to enable the fracturing fluid to enter the accommodating cavity from the pipe inlet 821 so as to simulate fracturing damage to the core 9; in the process, the outlet 822 is communicated with the pressure reducing device 2 to lead out the fracturing fluid for simulating the fracturing damage to the rock core 9 from the containing cavity, so that the air leakage condition of the rock core 9 in the process of moving the rock core 9 from the formation air pressure simulation module to the fracturing fluid simulation fracturing damage module is effectively avoided, the simulation error is reduced, the dynamic constant pressure of the simulation fracturing damage process can be maintained, and the fracturing damage process in the formation is truly simulated.
The tight gas reservoir fracturing fluid loss damage simulation device provided by the embodiment forms a closed simulation module by arranging a gas intermediate container 3, a fracturing fluid intermediate container 4, a pressure reducing device 2 and a rock core fixing device 8; because the core fixing device 8 is provided with a closed accommodating cavity for accommodating the core 9, one end of the core fixing device 8 is provided with a pipe inlet 821 and a pipe outlet 822 which are respectively communicated with the accommodating cavity, wherein the outlets of the gas intermediate container 3 and the fracturing fluid intermediate container 4 are respectively communicated with the pipe inlet 821, in the specific simulation process, the gas outlet of the gas intermediate container 3 can be firstly communicated with the pipe inlet 821, so that gas enters the accommodating cavity from the pipe inlet 821, and the saturation of the gas in the core 9 in the accommodating cavity is consistent with the gas saturation of the core in the stratum; then the gas outlet of the gas intermediate container 3 is closed, the outlet of the fracturing fluid intermediate container 4 is communicated with the pipe inlet 821, so that the fracturing fluid enters the accommodating cavity from the pipe inlet 821 to simulate fracturing damage to the rock core 9, and the rock core 9 does not need to be taken out in the whole simulation experiment process, so that the gas leakage condition generated in the process of moving the rock core 9 from the formation gas pressure simulation module to the fracturing fluid simulation fracturing damage module is effectively avoided, and the simulation error is reduced; in addition, the other end of the core fixing device 8 is provided with a circulating pipe orifice 84, the inlet end of the circulating pipe orifice 84 is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice 84 is communicated with the inner cavity of the gas intermediate container 3, so that gas entering the accommodating cavity can flow back to the gas intermediate container 3 from the circulating pipe orifice 84, the recycling rate of the gas is improved, and the core fixing device is energy-saving and environment-friendly; in addition, because the outlet 822 of the core fixing device 8 is communicated with the pressure reducing device 2, the pressure of the fracturing fluid discharged from the outlet 822 can be reduced, the dynamic constant pressure state of the simulated fracturing damage process can be maintained, and the fracturing damage process in the stratum can be simulated really.
In an embodiment of the present invention, the core fixing device 8 may specifically include: the clamp comprises a clamp shell 81, wherein a clamping rubber cylinder 811 is arranged inside the clamp shell 81, and an inner cavity of the clamping rubber cylinder 811 is formed into an accommodating cavity; the clamping rubber cylinder 811 is further provided with a clamping structure for clamping the core 9.
Wherein, press from both sides tight structure and specifically include: a left plunger 82 and a right plunger 83 which are respectively arranged at two ends of the clamping rubber cylinder 811, and a pipe inlet 821 and a pipe outlet 822 are arranged on the left plunger 82; the circulating pipe orifice 84 is arranged on the right plunger 83; the core 9 is clamped between the left plunger 82 and the right plunger 83; the outer ends of the left plunger 82 and the right plunger 83 are respectively provided with a left plunger fixing cover 85 and a right plunger fixing cover 86, and the left plunger fixing cover 85 and the right plunger fixing cover 86 are connected with the gripper housing 81 and used for pressing the left plunger 82 and the right plunger 83.
Specifically, the left plunger fixing cover 85 is sleeved at one end of the holder housing 81, the right plunger fixing cover 86 is sleeved at the other end of the holder housing 81, the left plunger fixing cover 85 is provided with a first thread, one end of the holder housing 81 is provided with a second thread in matching connection with the first thread, the right plunger fixing cover 86 is provided with a third thread, and the other end of the holder housing 81 is provided with a fourth thread in matching connection with the third thread.
Specifically, the left plunger fixing cover 85 is provided with a first through hole through which the left plunger 82 can pass, and the left plunger 82 is in sealing fit with the hole wall of the first through hole; the right plunger fixing cover 86 is provided with a second through hole for the right plunger 83 to pass through, and the right plunger 83 is in sealing fit with the hole wall of the second through hole.
In a specific implementation process, the left plunger 82 and the right plunger 83 have the same structure and respectively comprise a first cylinder and a second cylinder fixedly connected with the first cylinder; the outer diameter of the second cylinder is the same as the inner diameter of the clamping rubber cylinder 811, the outer diameters of the first cylinders of the left plunger 82 and the right plunger 83 are the same as the diameters of the first through hole of the left plunger fixing cover 85 and the second through hole of the right plunger fixing cover 86, and the diameter of the second cylinder is larger than that of the first cylinder.
It can be understood that the first through hole of the left plunger fixing cover 85 and the second through hole of the right plunger fixing cover 86 have the same diameter, and are respectively sleeved on the first cylinders of the left plunger 82 and the right plunger 83 and then cover the holder housing 81.
In a specific implementation process, after the core 9 is placed in the accommodating cavity, the left plunger 82 and the right plunger 83 are plugged, specifically, second cylinders of the left plunger 82 and the right plunger 83 are in contact with two ends of the core 9 to clamp the core 9; then, the left plunger fixing cover 85 and the right plunger fixing cover 86 are sleeved on the first cylinder and abut against the first cylinder and the junction of the first cylinder, and the screwing length between the left plunger fixing cover 85 and the right plunger fixing cover 86 and the holder shell 81 is gradually increased so as to extrude the left plunger 82 and the right plunger 83, thereby further clamping the core 9.
In one embodiment of the invention, the device further comprises a confining pressure pump 6 connected to the clamp shell 81; the confining pressure pump 6 is used for pressing the holding rubber cylinder 811 in the radial direction of the holding rubber cylinder 811, so that the holding rubber cylinder 811 clamps the core 9 in the radial direction.
Specifically, the holder housing 81 is provided with a confining pressure pump inlet 812, and the confining pressure pump 6 is connected with the holder housing 81 through the confining pressure pump inlet 812, so as to play a role of clamping the core 9 in the radial direction by pressing the holder housing 81.
In the specific implementation process, in an embodiment of the invention, the first injection pump 1 is further included, and an output end of the first injection pump 1 is respectively communicated with an inlet end of the gas intermediate container 3 and an inlet end of the fracturing fluid intermediate container 4, so as to press gas in the gas intermediate container 3 into the accommodating cavity from the pipe inlet 821, or press fracturing fluid in the fracturing fluid intermediate container 4 into the accommodating cavity from the pipe inlet 821, that is, the gas in the gas intermediate container 3 and the fracturing fluid in the fracturing fluid intermediate container 4 enter the accommodating cavity under the action of the first injection pump 1, so as to perform simulated inflation and fracturing damage on the core 9.
Specifically, the first syringe pump 1 is a pressure pump commonly used in the prior art, and can be set to a constant pressure mode, that is, the first syringe pump 1 automatically stops working when the pressure reaches a preset value.
Further, a first pressure sensor 11 for detecting a first end face of the core 9 is arranged at the pipe inlet 821, a second pressure sensor 12 for detecting a second end face of the core 9 is arranged at the other end of the core fixing device 8, and the first pressure sensor 11 and the second pressure sensor 12 are respectively electrically connected with the first injection pump 1.
Specifically, a first pressure sensor 11 is arranged between an outlet of the gas intermediate container 3, an outlet of the fracturing fluid intermediate container 4 and the pipe inlet 821, and a second pressure sensor 12 is arranged at the right end of the right plunger 83 to detect the pressure of the end faces on the two sides of the rock core 9, so as to adjust the pressurization or depressurization of the module according to the pressure values of the end faces on the two sides of the rock core 9.
In one embodiment of the present invention, the pressure reducing device 2 specifically includes a second syringe pump 21 and a second syringe pump intermediate container 22; the inlet end of the second injection pump intermediate container 22 is communicated with the outlet pipe port 822, and the outlet end accommodated in the middle of the second injection pump 21 is communicated with the second injection pump 21; in the specific process of simulating the fracturing damage, the first injection pump 1 is used for pressing fracturing fluid into the accommodating cavity, the second injection pump 21 is used for pumping the fracturing fluid which is used for simulating the fracturing damage to the rock core 9 in the accommodating cavity into the intermediate container 22 of the second injection pump, and the two operations are carried out simultaneously so as to form dynamic flow of high-pressure fluid on the end face of the rock core 9, thereby more truly simulating the flow of the fracturing fluid in the stratum and the process of simulating the fracturing damage; meanwhile, the pressure reducing device 2 can reduce the pressure of the fracturing fluid so as to balance the high-pressure environment in the module.
Specifically, the second injection pump 21 may be a decompression pump in the prior art, a piston 10 is disposed inside the intermediate container 22 of the second injection pump, one side of the piston 10 contains water, and the other side of the piston is used for containing fracturing fluid flowing out of the outlet 822, specifically, one side close to the outlet 822 contains fracturing fluid, and one side far away from the outlet 822 contains water.
In the specific implementation process, the simulation device also comprises a heating box 7 and a saturated gas bottle 5 for injecting gas into the gas intermediate container 3; in the specific implementation process, the core fixing device 8 is located in the heating box 7, and the heating box 7 is used for heating the core fixing device 8 so as to simulate the natural environment of the stratum to a higher degree.
Example two:
the embodiment provides a tight gas reservoir fracturing fluid loss damage simulation method, which is completed by using the tight gas reservoir fracturing fluid loss damage simulation device provided by the embodiment.
Fig. 4 is a schematic flow chart of a tight gas reservoir fracturing fluid loss damage simulation method according to an embodiment of the present invention. Referring to fig. 1 to 4, the method for simulating fluid loss damage of tight gas reservoir fracturing fluid of the present embodiment specifically includes:
s101, placing a core to be tested into an accommodating cavity of a core fixing device.
Specifically, the core 9 to be tested has a diameter of 2.54cm and a length in a range of 3-5cm, wherein the specific length of the core 9 to be tested can be set according to the structure of the holder housing 81, which is not limited in this embodiment.
In the specific implementation process, after the core 9 to be tested is placed in the accommodating cavity, the left plunger 82 and the right plunger 83 are plugged, the left plunger 82 and the right plunger 83 are kept in precise fit with the end faces of the two sides of the core 9, and in order to keep the stress of the two end faces of the core 9 consistent, the lengths of the left plunger 82 and the right plunger 83 entering the clamping rubber cylinder 811 are consistent; then, the left plunger fixing cover 85 and the right plunger fixing cover 86 are rotated to be assembled at the two ends of the holder housing 81, rotated for not less than 5 turns, and screwed tightly to further clamp the core 9 between the left plunger 82 and the right plunger 83; in the specific implementation process, the number of the rotation turns can be set according to specific conditions, and the comparison of the embodiment is not limited.
S102, filling gas in the gas intermediate container into the accommodating cavity through a pipe inlet of the core fixing device so that the core absorbs the gas until the saturation of the gas in the core is consistent with that of the core in the stratum;
in the specific implementation process, after the gas intermediate container 3 is opened, the confining pressure pump 6, the first injection pump 1 and the warming box 7 are simultaneously opened, and the preset values of the confining pressure pump 6, the first injection pump 1 and the warming box 7 are respectively set to be 92MPa, 50MPa and 150 ℃, so that the formation environment can be simulated more truly; when the first injection pump 1 reaches the preset value of 50Mpa, the process pressure is maintained according to the preset saturation time 168h, so that the problem of large simulation error caused by short simulation time is avoided.
S103, pressing the fracturing fluid in the fracturing fluid intermediate container into the accommodating cavity through the pipe inlet so as to enable the fracturing fluid to simulate fracturing damage to the rock core, and discharging the fracturing fluid after simulating fracturing damage to a pressure reducing device through a pipe outlet of the rock core fixing device.
Specifically, after the step S102 is completed, the gas intermediate container 3 is closed, the fracturing fluid intermediate container 4 and the pressure reducing device 2 are opened, the first injection pump 1 is simultaneously opened, and the preset value of the first injection pump 1 is set to 50Mpa again; further, the first injection pump 1 and the pressure reducing device 2 are set to operate at the same speed of 1ml/min, and the operation time is 20min, so that the pressure in the module is constant; and then the pressure reducing device 2 is closed, and the pressure in the module is kept constant to 15h, so that the problem of large simulation error caused by short simulation time is solved.
In the tight gas reservoir fracturing fluid loss damage simulation method provided by the embodiment, after a rock core 9 to be tested is placed in a tight gas reservoir fracturing fluid loss damage simulation device, a closed simulation module is formed by arranging a gas intermediate container 3, a fracturing fluid intermediate container 4, a pressure reducing device 2 and a rock core fixing device 8; because the core fixing device 8 is provided with a closed accommodating cavity for accommodating the core 9, one end of the core fixing device 8 is provided with a pipe inlet 821 and a pipe outlet 822 which are respectively communicated with the accommodating cavity, wherein the outlets of the gas intermediate container 3 and the fracturing fluid intermediate container 4 are respectively communicated with the pipe inlet 821, in the specific simulation process, the gas outlet of the gas intermediate container 3 can be firstly communicated with the pipe inlet 821, so that gas enters the accommodating cavity from the pipe inlet 821, and the saturation of the gas in the core 9 in the accommodating cavity is consistent with the gas saturation of the core in the stratum; then the gas outlet of the gas intermediate container 3 is closed, the outlet of the fracturing fluid intermediate container 4 is communicated with the pipe inlet 821, so that the fracturing fluid enters the accommodating cavity from the pipe inlet 821 to simulate fracturing damage to the rock core 9, and the rock core 9 does not need to be taken out in the whole simulation experiment process, so that the gas leakage condition generated in the process of moving the rock core 9 from the formation gas pressure simulation module to the fracturing fluid simulation fracturing damage module is effectively avoided, and the simulation error is reduced; in addition, the other end of the core fixing device 8 is provided with a circulating pipe orifice 84, the inlet end of the circulating pipe orifice 84 is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice 84 is communicated with the inner cavity of the gas intermediate container 3, so that gas entering the accommodating cavity can flow back to the gas intermediate container 3 from the circulating pipe orifice 84, the recycling rate of the gas is improved, and the core fixing device is energy-saving and environment-friendly; in addition, because the outlet 822 of the core fixing device 8 is communicated with the pressure reducing device 2, the pressure of the fracturing fluid discharged from the outlet 822 can be reduced, the dynamic constant pressure state of the simulated fracturing damage process can be maintained, and the fracturing damage process in the stratum can be simulated really.
The tight gas reservoir fracturing fluid loss damage simulation method of the embodiment is completed by the tight gas reservoir fracturing fluid loss damage simulation device of the first embodiment, and the specific working principle is the same as that of the first embodiment, and specific reference may be made to the description of the first embodiment, which is not repeated here.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first" and "second" in the description and claims of the present application and the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, module, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A tight gas reservoir fracturing fluid loss damage simulation device is characterized by comprising: the device comprises a gas intermediate container containing gas, a fracturing fluid intermediate container containing fracturing fluid, a pressure reducing device and a rock core fixing device;
the core fixing device is provided with a closed accommodating cavity for accommodating a core; one end of the core fixing device is provided with an inlet pipe orifice and an outlet pipe orifice which are respectively communicated with the accommodating cavity;
a gas outlet of the gas intermediate container is communicated with the pipe inlet so that the gas enters the accommodating cavity from the pipe inlet; the other end of the core fixing device is provided with a circulating pipe orifice, the inlet end of the circulating pipe orifice is communicated with the accommodating cavity, and the outlet end of the circulating pipe orifice is communicated with the inner cavity of the gas intermediate container, so that gas entering the accommodating cavity flows back to the gas intermediate container from the circulating pipe orifice;
and a fracturing fluid outlet of the fracturing fluid intermediate container is communicated with the pipe inlet so that the fracturing fluid enters the accommodating cavity from the pipe inlet to perform simulated fracturing damage on the rock core, and the pressure reducing device is communicated with the pipe outlet and is used for receiving the fracturing fluid which is discharged from the pipe outlet and performs simulated fracturing damage on the rock core and balancing the pressure in the accommodating cavity.
2. The tight gas reservoir fracturing fluid loss injury simulation device of claim 1, wherein the core holding device comprises: the clamp holder comprises a clamp holder shell, wherein a clamping rubber cylinder is arranged in the clamp holder shell, and an inner cavity of the clamping rubber cylinder is formed into an accommodating cavity;
and the clamping rubber cylinder is also provided with a clamping structure for clamping the rock core.
3. The tight gas reservoir fracturing fluid loss injury simulator of claim 2, wherein the clamping structure comprises: the left plunger and the right plunger are respectively arranged at two ends of the clamping rubber cylinder, and the pipe inlet and the pipe outlet are formed in the left plunger; the opening of the circulating pipe is arranged on the right plunger; the core is clamped between the left plunger and the right plunger;
the outer end of left side plunger with right side plunger is equipped with left plunger fixed cover and right plunger fixed cover respectively, left side plunger fixed cover with right plunger fixed cover all with the holder casing meets, is used for compressing tightly left side plunger with right plunger.
4. The tight gas reservoir fracturing fluid loss of damage simulation device of claim 3, wherein the left plunger retaining cap is sleeved on one end of the gripper housing, the right plunger retaining cap is sleeved on the other end of the gripper housing, the left plunger retaining cap has first threads, one end of the gripper housing has second threads in mating connection with the first threads, the right plunger retaining cap has third threads, and the other end of the gripper housing has fourth threads in mating connection with the third threads;
the left plunger fixing cover is provided with a first through hole for the left plunger to pass through, and the left plunger is in sealing fit with the hole wall of the first through hole; the right plunger fixing cover is provided with a second through hole for the right plunger to pass through, and the right plunger is in sealing fit with the hole wall of the second through hole.
5. The tight gas reservoir fracturing fluid loss of damage simulation device of claim 3, further comprising a confining pressure pump connected to the holder housing;
the confining pressure pump is used for pressing the clamping rubber cylinder in the radial direction of the clamping rubber cylinder so as to enable the clamping rubber cylinder to clamp the core in the radial direction.
6. The tight gas reservoir fracturing fluid loss injury simulation device of claim 1, further comprising a first injection pump;
the output end of the first injection pump is respectively communicated with the inlet end of the gas intermediate container and the inlet end of the fracturing fluid intermediate container so as to press gas in the gas intermediate container into the accommodating cavity from the pipe inlet opening, or press fracturing fluid in the fracturing fluid intermediate container into the accommodating cavity from the pipe inlet opening.
7. The tight gas reservoir fracturing fluid loss damage simulation device according to claim 6, wherein a first pressure sensor for detecting a first end face of the core is arranged at the pipe inlet, a second pressure sensor for detecting a second end face of the core is arranged at the other end of the core fixing device, and the first pressure sensor and the second pressure sensor are electrically connected with the first injection pump respectively.
8. The tight gas reservoir fracturing fluid loss simulation device of any one of claims 1 to 6, wherein the pressure reduction device comprises a second injection pump and a second injection pump intermediate container;
the inlet end of the middle container of the second injection pump is communicated with the pipe outlet, and the outlet end accommodated in the middle of the second injection pump is communicated with the second injection pump;
and the second injection pump is used for pumping the fracturing fluid which is used for simulating fracturing damage to the rock core in the accommodating cavity into a middle container of the second injection pump.
9. The tight gas reservoir fracturing fluid loss damage simulation device according to any one of claims 1 to 6, further comprising an incubator, wherein the core fixing device is located in the incubator, and the incubator is used for warming the core fixing device;
and the gas intermediate container is filled with gas.
10. A tight gas reservoir fracturing fluid loss injury simulation method is characterized by comprising the following steps:
putting a core to be tested into an accommodating cavity of a core fixing device;
filling gas in the gas intermediate container into the accommodating cavity through a pipe inlet of the core fixing device so that the core absorbs the gas until the saturation of the gas in the core is consistent with that of the core in the stratum;
and pressing the fracturing fluid in the fracturing fluid intermediate container into the accommodating cavity through the pipe inlet so as to enable the fracturing fluid to simulate fracturing damage to the rock core, and discharging the fracturing fluid after simulating fracturing damage to a pressure reducing device through the pipe outlet of the rock core fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811556849.1A CN111341191B (en) | 2018-12-19 | 2018-12-19 | Dense gas reservoir fracturing fluid loss damage simulation device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811556849.1A CN111341191B (en) | 2018-12-19 | 2018-12-19 | Dense gas reservoir fracturing fluid loss damage simulation device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111341191A true CN111341191A (en) | 2020-06-26 |
| CN111341191B CN111341191B (en) | 2022-03-29 |
Family
ID=71185020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811556849.1A Active CN111341191B (en) | 2018-12-19 | 2018-12-19 | Dense gas reservoir fracturing fluid loss damage simulation device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111341191B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014123966A1 (en) * | 2013-02-08 | 2014-08-14 | Schlumberger Canada Limited | Apparatus and methodology for measuring properties of microporous material at multiple scales |
| CN106124377A (en) * | 2016-06-16 | 2016-11-16 | 中海石油(中国)有限公司上海分公司 | The experimental test procedures of gas reservoir reverse osmosis water suction lock damage evaluation under high-temperature and high-pressure conditions |
| CN106596380A (en) * | 2016-12-30 | 2017-04-26 | 中国石油天然气股份有限公司 | Method and device for evaluating fracturing fluid flowback capacity of shale staged fracturing horizontal well |
| CN207937193U (en) * | 2018-04-08 | 2018-10-02 | 青岛石大石仪科技有限责任公司 | A kind of scattered sample core holding unit |
| CN109001438A (en) * | 2017-06-06 | 2018-12-14 | 中国石油化工股份有限公司 | A kind of joint seal gas shutoff experimental simulation device and test method |
-
2018
- 2018-12-19 CN CN201811556849.1A patent/CN111341191B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014123966A1 (en) * | 2013-02-08 | 2014-08-14 | Schlumberger Canada Limited | Apparatus and methodology for measuring properties of microporous material at multiple scales |
| CN106124377A (en) * | 2016-06-16 | 2016-11-16 | 中海石油(中国)有限公司上海分公司 | The experimental test procedures of gas reservoir reverse osmosis water suction lock damage evaluation under high-temperature and high-pressure conditions |
| CN106596380A (en) * | 2016-12-30 | 2017-04-26 | 中国石油天然气股份有限公司 | Method and device for evaluating fracturing fluid flowback capacity of shale staged fracturing horizontal well |
| CN109001438A (en) * | 2017-06-06 | 2018-12-14 | 中国石油化工股份有限公司 | A kind of joint seal gas shutoff experimental simulation device and test method |
| CN207937193U (en) * | 2018-04-08 | 2018-10-02 | 青岛石大石仪科技有限责任公司 | A kind of scattered sample core holding unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111341191B (en) | 2022-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113504125B (en) | True triaxial physicochemical combined coal rock anti-reflection test device and method | |
| CN108266164B (en) | A kind of experimental method and experimental provision improving recovery ratio by the Water Alternate Gas displacement of reservoir oil | |
| CN101798917B (en) | Multifunctional dynamic pollution evaluation device of coalbed drilling fluid | |
| CN103233725A (en) | Device and method for determining high temperature and high pressure full diameter core mud pollution evaluation | |
| CN104153734B (en) | Hydraulic pressure type coring tool | |
| CN108166968B (en) | Experimental system and method for measuring influence of soaking on permeability of compact rock core | |
| CN104535724B (en) | Measure the device and method of supercritical carbon dioxide fracturing fluid leak coefficient | |
| CN104568699A (en) | Method for measuring filtration coefficient of supercritical carbon dioxide fracturing fluid | |
| CN105842425B (en) | A kind of core holding unit and dynamic filtration experimental provision | |
| CN204804807U (en) | Experimental model of stifled water in simulation hydraulic fracturing crack | |
| CN108508151A (en) | A kind of pressure break diverting agent sealing characteristics evaluation experimental device and its working method and application | |
| CN107014980B (en) | A kind of semi-open type core holding unit | |
| CN111341191B (en) | Dense gas reservoir fracturing fluid loss damage simulation device and method | |
| CN112362558B (en) | Anisotropic relative permeability testing arrangement | |
| CN201635721U (en) | Multifunctional coalbed drilling fluid dynamic pollution assessment equipment | |
| CN206399782U (en) | A kind of constant temperature core holding unit device | |
| CN110631897A (en) | Multifunctional rock core holder | |
| CN206177535U (en) | A gas tightness test equipment for valve | |
| CN110761759A (en) | Testing device for foam oil displacement effect of fracture-cavity type bottom water reservoir | |
| CN202031558U (en) | Device simulating shear of polymer solution | |
| CN105484713B (en) | A kind of experimental method and device of the exploitation of simulation shale gas reservoir | |
| CN204571973U (en) | Novel descending hole capsule-pressure mucus sealing of hole draining pressure tester | |
| CN206957672U (en) | It is a kind of to simulate system of the CO_2 stimulation to the microcosmic displacement process of cecum oil | |
| CN110926954A (en) | Staged hydraulic fracturing test device and test method under true triaxial condition | |
| CN207703845U (en) | A kind of high temperature and pressure dynamic joint seal gas-stopping effect evaluation experimental device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |