CN110982501A - Temperature-controlled plugging gel and application method thereof - Google Patents
Temperature-controlled plugging gel and application method thereof Download PDFInfo
- Publication number
- CN110982501A CN110982501A CN201911237041.1A CN201911237041A CN110982501A CN 110982501 A CN110982501 A CN 110982501A CN 201911237041 A CN201911237041 A CN 201911237041A CN 110982501 A CN110982501 A CN 110982501A
- Authority
- CN
- China
- Prior art keywords
- gel
- plugging
- temperature
- controlled
- chromium
- 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.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention discloses a temperature-controlled leaking stoppage water plugging gel and an application method thereof, wherein the gel comprises 3-8% of polyacrylamide polymer, 0.2-0.5% of cross-linking agent, 0-15% of gelling regulator and the balance of clear water in percentage by weight; when in use, the gel slurry is prepared into pure liquid phase gel slurry according to requirements, and the gel slurry has excellent temperature control crosslinking capability and controllable crosslinking time, so that the gel slurry has excellent extrusion and injection capability; the crosslinking process is near-right-angle thickening, the initial setting and final setting time is short, and oil gas water channeling can be prevented in a stable stratum more effectively; the crosslinked gel has good acid-base resistance stability and high pressure bearing capacity, so that the plugging strip has stable and lasting effect and higher practical value.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a temperature-control plugging hydrogel and an application method thereof.
Background
In the drilling process, the phenomenon that drilling fluid enters a leakage layer under the action of positive pressure difference to cause serious drilling fluid loss is called as lost circulation because the leakage layer is formed by cracks, faults or karst caves existing in stratum rocks. Along with the deepening of oil and gas exploration and development, stratum conditions are more and more complex, large cracks and karst cave complex leakage stratums are gradually increased in a drilling well, and serious well leakage and blowout are easily caused due to high temperature and high pressure of the stratums, dispersion of the oil and gas stratums and large difference of interbedded channeling pressure.
The commonly used plugging method in the prior art comprises slurry bridging plugging and cement injection plugging, but the pumping of the plugging agent is very difficult due to the defect that the viscosity and the crosslinking time of the plugging agent are difficult to control, and the pumped plugging material is easily polluted and diluted by complex stratum and slurry, corroded by acid and alkali substances in a salt layer and a salt paste layer in the stratum and damaged by a high-temperature low layer to cause the softening, degradation or loss of the plugging material, and finally cause the failure of plugging.
Therefore, the problem to be solved by the technical personnel in the field is how to provide a high-pressure temperature-controlled plugging agent which is resistant to high temperature, acid and alkali corrosion and has excellent extrusion capacity.
Disclosure of Invention
In view of the above, the invention provides a temperature-controlled leaking stoppage hydrogel, which has excellent squeezing capacity, controllable crosslinking speed and good pressure resistance, and can realize effective plugging while permeating a leakage passage, thereby improving the success rate of primary leaking stoppage and the pressure-bearing capacity.
In order to achieve the purpose, the invention adopts the following technical scheme:
the temperature-controlled leaking stoppage and water plugging gel is characterized by comprising 3-8 wt% of polyacrylamide polymer, 0.2-0.5 wt% of cross-linking agent, 0-15 wt% of gelling regulator and the balance of clear water.
Preferably, the polyacrylamide polymer has a molecular weight of 80-300 ten thousand and a hydrolysis degree of 3-10%.
Preferably, the polyacrylamide polymer is one or two of polyacrylamide, acrylamide and 2-acrylamide-2-methyl propane sulfonic acid copolymer or acrylamide and p-styrene sulfonic acid copolymer.
Preferably, the cross-linking agent is Al3+、Cr3+Citrate, propionate or acetate organometallic complexes.
Preferably, the cross-linking agent is one or a combination of more of aluminum citrate, chromium acetate or chromium propionate.
The beneficial effects of the preferred technical scheme are as follows: the organic complex metal cross-linking agent can realize cross-linking of the acrylamide polymer through multi-core hydroxyl bridged ions formed by hydrolysis of polyvalent metal ions.
Preferably, the gelling regulator is a set accelerating regulator or a set retarding regulator;
the coagulation accelerator regulator is one or a combination of inorganic acid or chromium-containing inorganic salt;
the retarding regulator is chlorine-containing inorganic salt.
Preferably, the inorganic acid is one or a mixture of hydrochloric acid, nitric acid and sulfuric acid; the chromium-containing inorganic salt is one or a mixture of chromium trichloride, chromium triiodide and chromium tribromide; the chlorine-containing inorganic salt is one or a mixture of ammonium chloride and sodium chloride.
The beneficial effects of the preferred technical scheme are as follows: the gelling regulator can control crosslinking, so that the plugging gel has excellent extrusion and injection capacity when not crosslinked, and is convenient for permeation of a leakage stratum; after entering the designed position, the plugging agent can realize effective plugging of the lost stratum after cross-linking, and improve the success rate of primary plugging and the pressure-bearing capacity.
The invention also provides an application method of the temperature-control leaking stoppage hydrogel in the technical scheme, which is characterized by comprising the following processes:
uniformly dispersing polyacrylamide polymer and a crosslinking agent in clear water, adding a gelling regulator, uniformly mixing to obtain gel plugging slurry, pumping the gel plugging slurry into a designed position while drilling, regulating the squeeze pressure, the shut-off pressure and the shut-off time according to the on-site condition until the gel completes crosslinking at the designed position, and recovering drilling or production after effective plugging
Through the technical scheme, compared with the prior art, the temperature-controlled leaking stoppage water plugging gel provided by the invention has the advantages that firstly, the gel slurry is prepared into a pure liquid phase, the density and the viscosity of the gel slurry can be adjusted according to requirements, the gel slurry has excellent temperature-controlled crosslinking capability, and the crosslinking time is controllable, so that the gel slurry has excellent extrusion and injection capability; the crosslinking process is near-right-angle thickening, the initial setting and final setting time is short, and oil gas water channeling can be prevented in a stable stratum more effectively; the crosslinked gel has good acid-base resistance stability and high bearing capacity, so that the function of the leaking stoppage tape is stable and lasting, and the crosslinked gel has high practical value.
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 described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic drawing showing the rectangular thickening process of the gel obtained in example 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The method is characterized by preparing the plugging water gel based on a well section leakage working condition of 50-100 ℃ circulation temperature, and adopting the following raw material components:
fully mixing 6.5 wt% of Polyacrylamide (PAM) with the molecular weight of 150 ten thousand and the hydrolysis degree of 5% with 0.3 wt% of chromium acetate, dispersing into clear water, continuously stirring for 1-2h to fully dissolve the Polyacrylamide (PAM), and adding 6% of ammonium chloride in the stirring process to obtain the gel leakage-stopping slurry. And (3) crosslinking at the circulating temperature of 50-100 ℃ for 2-4h to obtain the plugging gel.
Example 2
The method is characterized by preparing the plugging water gel based on a well section leakage working condition of a circulation temperature of 25-50 ℃, and adopting the following raw material components:
fully mixing 5.5 wt% of acrylamide with the molecular weight of 200 ten thousand and the hydrolysis degree of 10% with 2-acrylamide-2-methylpropanesulfonic acid copolymer (P (AM-co-AMPS)) and 0.15 wt% of aluminum citrate, dispersing into clear water, continuously stirring for 1-3 h to fully dissolve, and adding 0.1% of dilute hydrochloric acid (with the effective content of 10%) and 0.05% of chromium trichloride in the stirring process to obtain the gel leakage-blocking slurry. And (3) crosslinking at the circulating temperature of 25-50 ℃ for 1-2h to obtain the plugging gel.
Example 3
The method is characterized by preparing the plugging water gel based on a well section leakage working condition of a circulation temperature of 100-150 ℃, and adopting the following raw material components:
fully mixing 7.2 wt% of Polyacrylamide (PAM) with the molecular weight of 90 ten thousand and the hydrolysis degree of 6% with 0.3 wt% of chromium acetate, adding the mixture into clear water, continuously stirring for 1-3 h to fully dissolve the mixture, and adding 12 wt% of ammonium chloride in the stirring process to obtain the gel leakage-stopping slurry. And (3) crosslinking at the circulating temperature of 100-150 ℃ for 4-6h to obtain the plugging gel.
Test example 1
The gel plugging slurry prepared in example 1 was subjected to a performance test, and the specific test procedures and results were as follows:
1) the results of the gel plugging slurry rheology test are shown in table 1:
table 1 gel rheology test
As can be seen from the test results in Table 1, the gel plugging slurry prepared in example 1 has excellent rheological properties.
2) Test of plugging pressure-bearing capacity
Adopting a simulated sandstone stratum test device, filling 20-40 meshes of quartz sand into a sand filling pipe to simulate hypertonic sandstone, filling a channel in the pipe with 2% saline/diesel oil, and measuring the initial permeability of the saline/diesel oil; injecting gel slurry, displacing saline water in the simulated core, keeping the temperature at the simulated temperature of 60 ℃ for more than 12h, fully displacing the gel crosslinked by the saline water, recording the pressure and the flow when the highest pressure of the equipment is 10MPa, and obtaining the specific result shown in table 2;
table 2 plugging capability test pressure and leak rate and permeability
The test results in table 2 show that the gel plugging agent prepared by the invention still has good plugging capability even under the pressure of 10MPa after plugging, which indicates that the gel plugging agent prepared by the invention is crosslinked under the action of the formation temperature after entering a leakage passage, forms a stable crosslinked body after a certain time, and forms a plugging barrier with good pressure-bearing plugging capability with weak cementation of formation rock.
3) Anti-contamination capability test
Clear water, 6 percent bentonite slurry and 10 percent water-based slurry are respectively adopted to prepare gel slurry, the performance is consistent after crosslinking, and the layering phenomenon is generated after weighting, but the crosslinking is not influenced; the gel prepared by the invention has good anti-pollution capability.
The gel prepared by the invention is applied to a well in Changqing, the lost circulation layer is positioned in a Liujia ditch group, cracks are relatively developed, the bearing capacity is low, the loss of the fractured property is mainly induced, the leakage stoppage while drilling, the leakage stoppage of fiber cement paste, the leakage stoppage of high water loss paste, the leakage stoppage by combining bridge paste and cement and the bridge leakage stoppage are carried out, and the effects are not good; by adopting the present inventionThe density of the bright gel liquid after plugging is 1.10g/cm3Lifting to 1.13g/cm3In the process of tripping and drilling, the drilling fluid is not leaked and consumed normally, thereby achieving the purpose of plugging construction.
Test example 2
The gel plugging slurry prepared in example 3 was subjected to a high-temperature high-pressure thickening performance test, and the specific test procedures and results were as follows:
target temperature: 150 ℃; temperature rise time: 60 min;
target pressure: 60 MPa; boosting time: 60 min;
the test results are shown in table 3 and fig. 1;
TABLE 3 gel thickening Properties
The results of the tests in Table 3 and FIG. 1 show that the gels prepared according to the invention have good thickening properties.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The temperature-controlled leaking stoppage and water plugging gel is characterized by comprising 3-8 wt% of polyacrylamide polymer, 0.2-0.5 wt% of cross-linking agent, 0-15 wt% of gelling regulator and the balance of clear water.
2. The temperature-controlled leaking stoppage hydrogel according to claim 1, wherein the polyacrylamide polymer is an acrylamide polymer having a molecular weight of 80 to 300 ten thousand and a degree of hydrolysis of 3 to 10%.
3. The temperature-controlled leaking stoppage hydrogel according to claim 2, wherein the polyacrylamide polymer is a mixture of two of polyacrylamide, a copolymer of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid or a copolymer of acrylamide and p-styrenesulfonic acid.
4. The temperature-controlled plugging hydrogel of claim 1, wherein said cross-linking agent is Al3+、Cr3+Citrate, propionate or acetate organometallic complexes.
5. The temperature-controlled leaking stoppage hydrogel according to claim 1, wherein the cross-linking agent is one or a combination of aluminum citrate, chromium acetate or chromium propionate.
6. The temperature-controlled leaking stoppage hydrogel according to claim 1, wherein the gelling regulator is a set accelerating regulator or a set retarding regulator;
the coagulation accelerator regulator is one or a combination of inorganic acid or chromium-containing inorganic salt;
the retarding regulator is chlorine-containing inorganic salt.
7. The temperature-controlled plugging hydrogel of claim 6, wherein the inorganic acid is one or a mixture of hydrochloric acid, nitric acid and sulfuric acid; the chromium-containing inorganic salt is one or a mixture of chromium trichloride, chromium triiodide and chromium tribromide; the chlorine-containing inorganic salt is one or a mixture of ammonium chloride and sodium chloride.
8. The application method of the temperature-controlled plugging gel according to any one of claims 1 to 7, which is characterized by comprising the following processes:
uniformly dispersing polyacrylamide polymers and a crosslinking agent in clear water, adding a gelling regulator, uniformly mixing to obtain gel plugging slurry, pumping the gel plugging slurry into a designed position while drilling, regulating the squeeze pressure, the shut-off pressure and the shut-off time according to the field condition until the gel plugging slurry is crosslinked at the designed position, and recovering drilling or production after effective plugging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237041.1A CN110982501A (en) | 2019-12-05 | 2019-12-05 | Temperature-controlled plugging gel and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237041.1A CN110982501A (en) | 2019-12-05 | 2019-12-05 | Temperature-controlled plugging gel and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110982501A true CN110982501A (en) | 2020-04-10 |
Family
ID=70090551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237041.1A Pending CN110982501A (en) | 2019-12-05 | 2019-12-05 | Temperature-controlled plugging gel and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110982501A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574976A (en) * | 2020-06-28 | 2020-08-25 | 四川格瑞迪斯石油技术有限公司 | Enhanced leaking stoppage gel and preparation method thereof |
| CN112280543A (en) * | 2020-10-29 | 2021-01-29 | 中国石油化工集团有限公司 | Composite gel plugging material and composite gel plugging slurry |
| CN114689825A (en) * | 2020-12-25 | 2022-07-01 | 中国石油化工股份有限公司 | Evaluation method for associated polymer modified cement slurry leakage stoppage |
| CN116554846A (en) * | 2023-01-02 | 2023-08-08 | 西南石油大学 | Gel plugging agent suitable for hypotonic ultra-hypotonic fractured reservoir and preparation method thereof |
| CN117209657A (en) * | 2023-09-13 | 2023-12-12 | 西南石油大学 | Polymer gel plugging agent suitable for tight fractured reservoir and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516974A (en) * | 2011-12-12 | 2012-06-27 | 中国石油天然气股份有限公司 | Foam profile control agent applicable to oil field in-depth profile control |
| CN104877653A (en) * | 2015-05-08 | 2015-09-02 | 西南石油大学 | Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs |
| US20190100692A1 (en) * | 2017-08-14 | 2019-04-04 | PfP INDUSTRIES, LLC | Compositions and methods for cross-linking hydratable polymers using produced water |
| CN109679602A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | A kind of frozen glue profile-controlling and plugging agent and preparation method thereof |
-
2019
- 2019-12-05 CN CN201911237041.1A patent/CN110982501A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516974A (en) * | 2011-12-12 | 2012-06-27 | 中国石油天然气股份有限公司 | Foam profile control agent applicable to oil field in-depth profile control |
| CN104877653A (en) * | 2015-05-08 | 2015-09-02 | 西南石油大学 | Phenolic aldehyde weak gel control and flooding agent for rapid gelling of low temperature oil reservoirs |
| US20190100692A1 (en) * | 2017-08-14 | 2019-04-04 | PfP INDUSTRIES, LLC | Compositions and methods for cross-linking hydratable polymers using produced water |
| CN109679602A (en) * | 2017-10-19 | 2019-04-26 | 中国石油化工股份有限公司 | A kind of frozen glue profile-controlling and plugging agent and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574976A (en) * | 2020-06-28 | 2020-08-25 | 四川格瑞迪斯石油技术有限公司 | Enhanced leaking stoppage gel and preparation method thereof |
| CN112280543A (en) * | 2020-10-29 | 2021-01-29 | 中国石油化工集团有限公司 | Composite gel plugging material and composite gel plugging slurry |
| CN114689825A (en) * | 2020-12-25 | 2022-07-01 | 中国石油化工股份有限公司 | Evaluation method for associated polymer modified cement slurry leakage stoppage |
| CN116554846A (en) * | 2023-01-02 | 2023-08-08 | 西南石油大学 | Gel plugging agent suitable for hypotonic ultra-hypotonic fractured reservoir and preparation method thereof |
| CN117209657A (en) * | 2023-09-13 | 2023-12-12 | 西南石油大学 | Polymer gel plugging agent suitable for tight fractured reservoir and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110982501A (en) | Temperature-controlled plugging gel and application method thereof | |
| CN110129013B (en) | Organic-inorganic composite gel plugging agent and preparation method and application thereof | |
| CN105041261A (en) | Well-killing workover method used with water plugging | |
| CN109369848A (en) | A kind of functional form temperature-resistant anti-salt plugging agent and preparation method thereof | |
| CN114574180B (en) | Time-delay gel composite plugging liquid and preparation method thereof | |
| CN109971443B (en) | Three-phase foam channeling sealing agent, preparation method thereof and thickened oil exploitation plugging adjusting method | |
| CN114479788B (en) | Water-based drilling fluid composition suitable for high-temperature easily collapsed stratum, water-based drilling fluid, preparation method and application thereof | |
| Qiu et al. | Successful field application of microgel treatment in high temperature high salinity reservoir in China | |
| CN115538972A (en) | Drilling well plugging method suitable for malignant leakage stratum | |
| Guo et al. | Performance evaluation of high-strength polyethyleneimine gels and syneresis mechanism under high-temperature and high-salinity conditions | |
| CN112876612B (en) | Temperature-sensitive low-fluid-loss underground cross-linking agent for plugging cracks and application thereof | |
| CN107556996B (en) | CO (carbon monoxide)2Response in-situ gel channeling sealing agent and preparation method and application thereof | |
| CN110041903A (en) | A kind of low pressure leakage gas well blocking agent and its preparation method and application method | |
| CN110305644B (en) | Preparation and application of leakage-reducing flexible colloidal particle well-flushing fluid | |
| CN106753297A (en) | A kind of anti-salt type polymer gel profile control agent | |
| CN106467598A (en) | A kind of cross linked amphoteric polymeric ball of string and preparation method thereof | |
| Hatzignatiou et al. | Polymers and polymer-based gelants for improved oil recovery and water control applications in naturally fractured chalk formations | |
| CN114058359B (en) | Preparation method and application of degraded gel system for drilling and plugging of deepwater and ultra-deepwater fractured reservoir | |
| CN103788937B (en) | A kind of Low Damage seawater base weighted fracture fluid | |
| CN106995689A (en) | A kind of compound agent for anti gassing-out of carbon dioxide drive | |
| CN113136185A (en) | Organic water plugging gel for low-temperature hypersalinity oil reservoir | |
| CN116554846A (en) | Gel plugging agent suitable for hypotonic ultra-hypotonic fractured reservoir and preparation method thereof | |
| CN112760088B (en) | Viscoelastic self-regulation profile control flooding agent and preparation method thereof | |
| CN114183095A (en) | Large-scale fracture plugging method for fractured reservoir | |
| CN112442343B (en) | Composite gel plugging agent and preparation method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |
|
| RJ01 | Rejection of invention patent application after publication |