CN113122212A - Preparation method and application of profile control agent - Google Patents
Preparation method and application of profile control agent Download PDFInfo
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- CN113122212A CN113122212A CN202010030115.0A CN202010030115A CN113122212A CN 113122212 A CN113122212 A CN 113122212A CN 202010030115 A CN202010030115 A CN 202010030115A CN 113122212 A CN113122212 A CN 113122212A
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- 238000000034 method Methods 0.000 claims description 39
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 8
- 239000003002 pH adjusting agent Substances 0.000 claims description 7
- XYPISWUKQGWYGX-UHFFFAOYSA-N 2,2,2-trifluoroethaneperoxoic acid Chemical compound OOC(=O)C(F)(F)F XYPISWUKQGWYGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- BVXMSQWCZAGNTO-UHFFFAOYSA-N 3,5-dinitrobenzenecarboperoxoic acid Chemical compound OOC(=O)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1 BVXMSQWCZAGNTO-UHFFFAOYSA-N 0.000 claims description 4
- LJGHYPLBDBRCRZ-UHFFFAOYSA-N 3-(3-aminophenyl)sulfonylaniline Chemical compound NC1=CC=CC(S(=O)(=O)C=2C=C(N)C=CC=2)=C1 LJGHYPLBDBRCRZ-UHFFFAOYSA-N 0.000 claims description 4
- YNJSNEKCXVFDKW-UHFFFAOYSA-N 3-(5-amino-1h-indol-3-yl)-2-azaniumylpropanoate Chemical compound C1=C(N)C=C2C(CC(N)C(O)=O)=CNC2=C1 YNJSNEKCXVFDKW-UHFFFAOYSA-N 0.000 claims description 4
- 239000004971 Cross linker Substances 0.000 claims 1
- 230000005465 channeling Effects 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- 239000005011 phenolic resin Substances 0.000 description 10
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- 230000008569 process Effects 0.000 description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 238000003763 carbonization Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
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- 238000005273 aeration Methods 0.000 description 3
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- 238000010438 heat treatment Methods 0.000 description 3
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- 239000000203 mixture Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
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- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
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- 238000009835 boiling Methods 0.000 description 2
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- SCKXCAADGDQQCS-UHFFFAOYSA-N Performic acid Chemical compound OOC=O SCKXCAADGDQQCS-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
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- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Environmental & Geological Engineering (AREA)
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Abstract
The application discloses a preparation method and application of a profile control agent, and belongs to the field of profile control plugging. Sequentially adding water and natural rice hulls into a solution preparation pool at a preset temperature, and uniformly mixing to obtain a first suspension; adding an oxidant into the first suspension, stirring for a first preset time, and decomposing carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in lignin contained in the natural rice hulls to obtain a second suspension; adding a pH value regulator into the second suspension, and regulating the pH value of the second suspension to be a reference value to obtain a third suspension; and adding polyacrylamide and a cross-linking agent into the third suspension, and uniformly mixing to obtain the profile control agent. Because the natural rice hulls in the profile control agent basically do not contain lignin, namely the lignin contained in the natural rice hulls cannot influence the viscosity of the profile control agent, the profile control and channeling sealing capacity of the profile control agent can be improved. The profile control agent has mild reaction conditions, simple preparation method, easy operation and no pollution.
Description
Technical Field
The application relates to the field of profile control plugging, in particular to a preparation method and application of a profile control agent.
Background
In the water injection development process, due to the existence of reservoir heterogeneity or microcracks, a water flow dominant channel can be formed in a reservoir, so that injected water is easily and quickly propelled in the reservoir, the situation of 'water channeling in a high-permeability layer and water drive unswept in a low-permeability layer' is formed, and the rapid water increase, the rapid yield decrease and even the water flooding of an oil well are caused. Therefore, the profile control agent is required to be utilized to effectively plug the high permeable formation in the reservoir, so that the injected water can flow to the low permeable formation, and the water content of the oil well is reduced.
The related technology provides a preparation method of a carbonized rice hull powder particle profile control and flooding agent, which comprises the steps of firstly weighing a certain amount of rice hulls and filling the rice hulls into a carbonization tank; then putting the carbonization tank into a constant-temperature curing box, adjusting the heating temperature to 200-270 ℃, and carrying out carbonization treatment on the rice hulls for 2-3 hours at the constant temperature; and finally, taking out the carbonized rice hulls, and crushing and screening the rice hulls after the rice hulls are cooled to obtain the carbonized rice hull powder particle profile control and flooding agent.
However, the temperature for heating the carbonization tank in the method is high, and if the operation is not proper by technicians, the high-temperature carbonization tank is easy to cause safety accidents.
Disclosure of Invention
The application provides a preparation method and application of a profile control agent, which can solve the problem of safety accidents easily caused in the related technology. The technical scheme is as follows:
in a first aspect, embodiments of the present application provide a method for preparing a profile control agent, the method including:
sequentially adding water and natural rice hulls into a liquid preparation pool at a preset temperature, and uniformly mixing to obtain a first suspension;
adding an oxidant into the first suspension, stirring for a first preset time, and decomposing carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in lignin contained in the natural rice hulls by using the oxidant to obtain a second suspension;
adding a pH value regulator into the second suspension, and regulating the pH value of the second suspension to be a reference value to obtain a third suspension;
and adding polyacrylamide and a cross-linking agent into the third suspension, and uniformly mixing to obtain the profile control agent.
Optionally, the preset temperature is 15-25 ℃.
Optionally, the mass ratio of the water to the natural rice hulls is 1: 20 to 100.
Optionally, the oxidizing agent is selected from at least one of ozone, trifluoroperacetic acid, 3, 5-dinitroperbenzoic acid, performic acid, perbenzoic acid, peracetic acid, or hydrogen peroxide.
Optionally, the concentration of the oxidizing agent is 3mg/L to 30 mg/L.
Optionally, the first preset time is 30min to 120 min.
Optionally, the pH adjusting agent is citric acid or acetic acid.
Optionally, the reference value is 5.0-6.0.
Optionally, the mass ratio of the polyacrylamide to the cross-linking agent is 3: 2 to 5.
In a second aspect, embodiments of the present application provide a use of a profile control agent, the use comprising profile control of an injection well with any of the profile control agents described above.
The technical scheme provided by the application can at least bring the following beneficial effects:
according to the preparation method of the profile control agent, provided by the embodiment of the application, water and a certain amount of natural rice hulls are sequentially added into a liquid preparation pool at a preset temperature, so that a granular first suspension can be formed; then adding an oxidant into the first suspension, wherein the oxidant can decompose carbon-carbon double bonds, carbon-oxygen bonds and benzene ring structures in lignin contained in the natural rice hulls, so that the lignin is decomposed into small molecular compounds such as organic hydroxy acid and aldehyde, and the influence of the lignin contained in the natural rice hulls on the viscosity of polyacrylamide can be reduced; the pH value of the profile control agent can be adjusted by adding the pH adjusting agent, so that the profile control agent always presents subacidity, and the dissolution of lignin which is not decomposed by the oxidant in the natural rice hulls can be avoided; by adding polyacrylamide and a cross-linking agent, cross-linking reaction can be carried out between molecules in the polyacrylamide under the action of the cross-linking agent, so that cross-linked polyacrylamide gel with a net structure can be formed, and then the cross-linked polyacrylamide gel is mixed with natural rice hulls to obtain the profile control agent. Thus, in the profile control agent prepared by the method, the natural rice hulls do not contain lignin basically, namely the lignin contained in the natural rice hulls does not influence the viscosity of the cross-linked polyacrylamide gel, so that the overall viscosity of the profile control agent is not influenced, and the overall profile control and channeling blocking capability of the profile control agent can be improved. And the profile control agent has mild reaction conditions, simple preparation method, easy operation and no secondary pollution.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing a profile control agent provided in the examples of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Before explaining the embodiments of the present application in detail, an application scenario of the embodiments of the present application will be described.
In the water injection development process, gel type, inorganic precipitation type or particle type medicines are generally adopted to be injected into an oil-water well to block a water injection channeling channel in a stratum, so that the effects of water blocking and water absorption profile adjustment are achieved, and the oil production of an oil well is increased. Among them, this plugging measure is called oil-water well profile control, and the adopted medicament is called profile control agent.
The currently adopted profile control agent is usually cross-linked polyacrylamide gel, but for a water injection channeling channel with a larger aperture formed in a water injection development stratum, single cross-linked polyacrylamide gel cannot meet the profile control requirement of an oil-water well, so that the cross-linked polyacrylamide gel needs to be matched with a granular medicament, the profile control and channeling sealing capacity is improved, and the profile control of the oil-water well is better carried out.
Wherein, the natural rice hull as the main component of the profile control agent has hard texture, low cost and small specific gravity, so the natural rice hull can be used as the granular profile control agent. When the natural rice hulls and the cross-linked polyacrylamide gel block the water injection channeling channel with larger aperture, the natural rice hulls can be firstly accumulated in the water injection channeling channel, so that the aperture of the water injection channeling channel is reduced, and then the cross-linked polyacrylamide gel blocks the channel with small aperture. However, the lignin contained in the natural rice hulls can degrade polyacrylamide contained in the cross-linked polyacrylamide gel, the viscosity of the cross-linked polyacrylamide gel is influenced, and the profile control channeling strength of the profile control agent formed after the cross-linked polyacrylamide gel and the granular profile control agent are mixed can be further reduced. Thus, the lignin contained in the natural rice hulls must be treated to reduce the effect of the lignin contained in the natural rice hulls on the viscosity of the cross-linked polyacrylamide gel.
At present, the treatment method of lignin contained in natural rice hulls mainly comprises four methods: the first method is to extract lignin contained in the natural rice hulls by using an organic solvent (such as ethylene glycol and ethanol) so as to reduce the content of the lignin contained in the natural rice hulls, wherein the used organic solvent can be recycled. However, the process of the extraction method is relatively complex; the second method is to extract the lignin contained in the natural rice hulls by adopting a sodium hydroxide boiling water boiling method. The method is simple to operate, but the finally formed solution contains sodium ions, so that the solution is not beneficial to recycling, and the environment is also influenced by the discharge of the solution; the third is to use quaternary ammonium hydroxide to extract lignin contained in natural rice hulls. However, this method is complicated and requires distillation under reduced pressure of the resulting filtrate to remove ethanol from the filtrate; the fourth method is to remove lignin in the natural rice hulls by high-temperature carbonization, the process of the method is simple, but the temperature of the heating carbonization tank is higher, and if technical personnel do not operate properly, the high-temperature carbonization tank is easy to cause safety accidents.
Therefore, the embodiment of the application provides a preparation method of a profile control agent, wherein in order to reduce the influence of lignin contained in natural rice hulls on the viscosity of cross-linked polyacrylamide gel, the preparation method treats the lignin contained in the natural rice hulls used in the profile control agent, and the treatment process is simple.
In a first aspect, an embodiment of the present invention provides a method for preparing a profile control agent, and referring to fig. 1, the method includes:
step 101: and sequentially adding water and the natural rice hulls into the liquid preparation pool at a preset temperature, and uniformly mixing to obtain a first mixed suspension.
It should be noted that the preset temperature can be preset according to the use requirement, for example, the preset temperature can be 15-25 ℃. Illustratively, the preset temperature may be 15 ℃, 20 ℃, 25 ℃, or the like.
It should be noted that the mass ratio of water to natural rice hulls may be 1: 20-1: 100, for example, the mass ratio of water to natural rice hulls may be 1: 20. 1: 40. 1: 60. 1: 80 or 1: 100, etc.
Step 102: and adding an oxidant into the first suspension, stirring for a first preset time, and decomposing carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in lignin contained in the natural rice hulls by using the oxidant to obtain a second suspension.
The oxidizing agent decomposes carbon-carbon double bonds, carbon-oxygen bonds, and benzene ring structures in lignin contained in the natural rice hulls, so that the lignin is decomposed into small molecular compounds such as organic hydroxy acids and aldehydes, and the influence of the lignin contained in the natural rice hulls on the crosslinked polyacrylamide gel can be reduced.
The oxidizing agent may be at least one of ozone, trifluoroperacetic acid, 3, 5-dinitroperbenzoic acid, performic acid, perbenzoic acid, peracetic acid, and hydrogen peroxide. In the present embodiment, the oxidizing agent may be one of ozone; the oxidant can be ozone and trifluoro peroxy acetic acid, and the mixing ratio can be 1: 1; the oxidant can also be a mixture of three of ozone, trifluoro peroxyacetic acid and peroxyformic acid, and the mixing ratio can be 1: 1: 2.
the combination of the above-mentioned oxidizing agents is not limited to this, and the ratio between the combination of the selected oxidizing agents is also not limited to this.
It is noted that ozone, trifluoroperacetic acid, 3, 5-dinitroperbenzoic acid, performic acid, perbenzoic acid, peracetic acid, and hydrogen peroxide are all strongly oxidizing. Because the oxidant mainly decomposes carbon-carbon double bonds, carbon-oxygen bonds and benzene ring structures in the lignin, and the bond energy among the carbon-carbon double bonds, the carbon-oxygen bonds and unsaturated bonds in the benzene ring structures is larger, higher energy is required to break the unsaturated bonds. Therefore, the unsaturated bonds can be broken by using an oxidant with strong oxidizability, so that the lignin can be guaranteed to be decomposed.
The concentration of the oxidizing agent may be set in advance according to the use requirement, and for example, the concentration of the oxidizing agent may be 3mg/L to 30mg/L (mg/L). Illustratively, the concentration of the oxidizing agent may be 3mg/L, 16mg/L, or 30mg/L, etc.
It is noted that when ozone is used as the oxidizing agent, dry air can be used as the air source, and the dry air is conveyed to the corona discharge ozone generator through the air compressor to prepare ozone, and then the ozone enters the first suspension through the aeration head. Wherein, the ozone uses dry air as the air source, so the air source is easy to obtain and the cost is lower.
It should be noted that the air compressor is used to provide transmission power for the drying air. The embodiment of the application does not limit the type or variety of the air compressor.
The corona discharge ozone generator is an apparatus for generating ozone by an ozone power discharge method. The specific principle is that oxygen molecules contained in air are bombarded by high-speed electrons when the air passes through a corona discharge zone, so that the oxygen molecules are decomposed into oxygen atoms, and then the oxygen atoms are collided by the high-speed electrons to form ozone.
It is noted that varying the ozone concentration can be achieved by varying the power of the corona discharge ozone generator. Generally, the higher the power of a corona discharge ozone generator, the higher the concentration of ozone produced.
The aeration head is a member that brings air into sufficient contact with water. When ozone passes through the aeration head, oxygen in the ozone can perform mass transfer with the first suspension, so that the ozone can be better dissolved in the first suspension.
The first preset time may be preset according to a use requirement, and for example, the first preset time may be 30min to 120min (minutes). Illustratively, the first preset time may be 30min, 75min, 120min, or the like.
The stirring in the above-described process may be achieved by providing a stirrer in the liquid preparation tank, and for example, a propeller stirrer, a paddle stirrer, a propeller stirrer, a turbine stirrer, or the like may be provided. The profile control agent provided in the examples of the present application can also be prepared by means of manual stirring.
Step 103: and adding a pH value regulator into the second suspension, and regulating the pH value of the second suspension to be a reference value to obtain a third suspension.
It should be noted that the pH adjusting agent can adjust the pH of the profile control agent to be always weakly acidic, thereby preventing the lignin contained in the natural rice hulls from being dissolved. In the present embodiment, the pH adjusting agent may be citric acid or acetic acid. Illustratively, the pH adjusting agent may be one of citric acid; the pH value regulator can also be a mixture of citric acid and acetic acid, and the mixing ratio can be 1: 1.
the embodiment of the present application is not limited to the combination of the pH adjusters, and the ratio of the selected combination of the pH adjusters is not limited to this.
The reference value may be preset according to a use requirement, for example, the reference value may be 5.0 to 6.0, and for example, the reference value may be 5.0, 5.5, or 6.0. Even if the pH of the profile control agent exhibits weak acidity.
Step 104: and adding polyacrylamide and a cross-linking agent into the third suspension, and uniformly mixing to obtain the profile control agent.
It should be noted that the type of polyacrylamide may be preset according to the use requirement. For example, the polyacrylamide may be a partially hydrolyzed polyacrylamide, wherein the molecular weight of the partially hydrolyzed polyacrylamide is greater than 1500 ten thousand, and the degree of hydrolysis is greater than 25%.
The type of the cross-linking agent may be preset according to the use requirement, and for example, the cross-linking agent may be a water-soluble phenolic resin or a chromium cross-linking agent. In the embodiment of the present application, the crosslinking agent may be one of water-soluble phenolic resins; the crosslinking agent can also be a mixture of two of a water-soluble phenolic resin and a chromium crosslinking agent, and the mixing ratio can be 1: 1.
the embodiment of the present application is not limited to the combination of the above crosslinking agents, and the ratio of the selected combination of the components of the crosslinking agent is not limited to this.
It should be noted that, when a cross-linking agent is added to polyacrylamide, cross-linking reaction occurs between molecules in polyacrylamide, so that a cross-linked gel is formed, and a spatial network structure is formed. When meeting water, the water molecules are wrapped by the space network structure, so that the flow of the water can be prevented.
Wherein, the mass ratio between the polyacrylamide and the cross-linking agent can be 3: 2-3: illustratively, the mass ratio of the polyacrylamide to the crosslinking agent may be 3: 3. 3: 4 or 3: 5, and the like. The mass ratio between the polyacrylamide and the crosslinking agent is not limited to this in the examples of the present application.
According to the preparation method of the profile control agent, provided by the embodiment of the application, water and a certain amount of natural rice hulls are sequentially added into a liquid preparation pool at a preset temperature, so that a granular first suspension can be formed; then adding an oxidant into the first suspension, wherein the oxidant can decompose carbon-carbon double bonds, carbon-oxygen bonds and benzene ring structures in lignin contained in the natural rice hulls, so that the lignin is decomposed into small molecular compounds such as organic hydroxy acid and aldehyde, and the influence of the lignin contained in the natural rice hulls on the viscosity of polyacrylamide can be reduced; the pH value of the profile control agent can be adjusted by adding the pH adjusting agent, so that the profile control agent always presents subacidity, and the dissolution of lignin which is not decomposed by the oxidant in the natural rice hulls can be avoided; by adding polyacrylamide and a cross-linking agent, cross-linking reaction can be carried out between molecules in the polyacrylamide under the action of the cross-linking agent, so that cross-linked polyacrylamide gel with a net structure can be formed, and then the cross-linked polyacrylamide gel is mixed with natural rice hulls to obtain the profile control agent. Thus, in the profile control agent prepared by the method, the natural rice hulls do not contain lignin basically, namely the lignin contained in the natural rice hulls does not influence the viscosity of the cross-linked polyacrylamide gel, so that the overall viscosity of the profile control agent is not influenced, and the overall profile control and channeling blocking capability of the profile control agent can be improved. And the profile control agent has mild reaction conditions, simple preparation method, easy operation and no secondary pollution.
In a second aspect, the embodiments of the present application provide an application of a profile control agent, that is, the profile control agent is used for profile control of a water injection well
It should be noted that the profile control agent provided by the embodiment of the present application is mainly applied to blocking a water injection cross flow channel in a water injection development formation. The profile control agent has higher viscosity, so the profile control agent can form gel for a long time, and the plugging time of the profile control agent is longer, and the plugging effect is better. In the using process, the profile control agent provided by the embodiment of the application is prepared firstly, and then the profile control agent is extruded and injected into a water injection well, so that the profile control agent flows to a position needing plugging, such as a water injection channeling channel in a water injection development stratum, and the like, so as to perform plugging operation.
In order to make the technical solutions and advantages of the present application more clear, the following detailed description will be given by means of alternative embodiments.
It should be noted that the components involved in the following optional examples are respectively as follows:
polyacrylamide: the molecular weight of the anionic polyacrylamide is more than or equal to 2500 ten thousand, the product model of the polyacrylamide is BHHP-113, and the product standard is Q/12DGY 3865-2014.
A crosslinking agent: the phenolic resin is an oligomeric polyphenol cross-linking agent, the product model is type I, and the product standard is Q/12DGY 3805-2014.
Example 1
Sequentially adding 20kg (kilogram) of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; then introducing ozone with the concentration of 3mg/L into the first suspension, stirring for 30min, and carrying out ozone oxidation decomposition on lignin in the rice hulls to obtain a second suspension, wherein the concentration of the ozone is kept unchanged all the time in the stirring process; adding citric acid into the second suspension, and adjusting the pH value of the second suspension to 5.5 to obtain a third suspension; and finally, adding 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin into 1kg of the third suspension, and uniformly mixing to obtain the profile control agent.
After the profile control agent is placed at a constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by a DV-II viscometer, and the viscosity of the profile control agent is found to be 8450mPa.s (millipascal.sec).
Comparative example 1
Sequentially adding 20kg of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; and 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin are added into 1kg of the first suspension to be uniformly mixed, so that the profile control agent can be obtained.
After the profile control agent is placed at the constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by adopting a DV-II viscometer, and the viscosity of the profile control agent is found to be 2845mPa.s through measurement.
The viscosity of the profile control agent prepared in comparative example 1 was found to be 66.33% lower than the viscosity of the profile control agent prepared in example 1 by comparison.
Example 2
Sequentially adding 60kg of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; then introducing 16mg/L ozone into the first suspension, stirring for 75min, and carrying out ozone oxidation decomposition on lignin in the rice hulls to obtain a second suspension, wherein the concentration of the ozone is kept unchanged all the time in the stirring process; adding citric acid into the second suspension, and adjusting the pH value of the second suspension to 5.5 to obtain a third suspension; and finally, adding 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin into 1kg of the third suspension, and uniformly mixing to obtain the profile control agent.
After the profile control agent is placed at the constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by adopting a DV-II viscometer, and the viscosity of the profile control agent is found to be 11184mPa.s through measurement.
Comparative example 2
Sequentially adding 60kg of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; and 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin are added into 1kg of the first suspension to be uniformly mixed, so that the profile control agent can be obtained.
After the profile control agent is placed at the constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by adopting a DV-II viscometer, and the viscosity of the profile control agent is found to be 3750mPa.s through measurement.
The viscosity of the profile control agent prepared in comparative example 2 was found to be reduced by 66.45% from the viscosity of the profile control agent prepared in example 2 by comparison.
Example 3
Sequentially adding 100kg of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; then introducing ozone with the concentration of 30mg/L into the first suspension, stirring for 120min, and carrying out ozone oxidation decomposition on lignin in the rice hulls to obtain a second suspension, wherein the concentration of the ozone is kept unchanged all the time in the stirring process; adding citric acid into the second suspension, and adjusting the pH value of the second suspension to 5.5 to obtain a third suspension; and finally, adding 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin into 1kg of the third suspension, and uniformly mixing to obtain the profile control agent.
After the profile control agent is placed at a constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by a DV-II viscometer, and the viscosity of the profile control agent is 13147mPa.s (millipascal.sec).
Comparative example 3
Sequentially adding 100kg of water and 1kg of natural rice hulls into a solution preparation pool at 25 ℃, and uniformly mixing to obtain a first suspension; and 3g of partially hydrolyzed polyacrylamide and 3g of phenolic resin are added into 1kg of the first suspension to be uniformly mixed, so that the profile control agent can be obtained.
After the profile control agent is placed at the constant temperature of 60 ℃ for 7 days, the viscosity of the profile control agent is measured by adopting a DV-II viscometer, and the viscosity of the profile control agent is 5769mPa.s through measurement.
The viscosity of the profile control agent prepared in comparative example 3 was found to be 56.12% lower than the viscosity of the profile control agent prepared in example 3 by comparison.
By comparing example 1, example 2 and example 3 with comparative example 1, comparative example 2 and comparative example 3, respectively, it can be found that the viscosity of the profile control agent prepared by the preparation method in example 1, example 2 or example 3 is high, and therefore, the viscosity of polyacrylamide is not affected by lignin contained in natural rice hulls in the profile control agent prepared by the method, so that the overall viscosity of the profile control agent is not affected, and the overall profile control and channeling prevention capability of the profile control agent is not affected.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of preparing a profile control agent, the method comprising:
sequentially adding water and natural rice hulls into a liquid preparation pool at a preset temperature, and uniformly mixing to obtain a first suspension;
adding an oxidant into the first suspension, stirring for a first preset time, and decomposing carbon-carbon double bonds, carbon-oxygen bonds and benzene rings in lignin contained in the natural rice hulls by using the oxidant to obtain a second suspension;
adding a pH value regulator into the second suspension, and regulating the pH value of the second suspension to be a reference value to obtain a third suspension;
and adding polyacrylamide and a cross-linking agent into the third suspension, and uniformly mixing to obtain the profile control agent.
2. The method of claim 1, wherein the predetermined temperature is 15-25 ℃.
3. The method of claim 1 wherein the mass ratio of said water to said natural rice hulls is from 1: 20 to 100.
4. The method of claim 1, wherein the oxidizing agent is selected from at least one of ozone, trifluoroperacetic acid, 3, 5-dinitroperbenzoic acid, performic acid, perbenzoic acid, peracetic acid, or hydrogen peroxide.
5. The method of claim 1, wherein the oxidizing agent is present at a concentration of 3mg/L to 30 mg/L.
6. The method of claim 1, wherein the first predetermined time is 30min to 120 min.
7. The method of claim 1, wherein the pH adjusting agent is citric acid or acetic acid.
8. The method of claim 1, wherein the reference value is 5.0 to 6.0.
9. The method of claim 1, wherein the mass ratio of polyacrylamide to crosslinker is 3: 2 to 5.
10. Use of a profile control agent for the profile control of a water injection well according to any of claims 1 to 9.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209100A (en) * | 2014-09-29 | 2014-12-17 | 大连工业大学 | Method for preparing adsorbing agents by rice hulls |
| CN105175643A (en) * | 2015-09-02 | 2015-12-23 | 莱芜市涌金化工有限公司 | Elastomeric blocking polymer particle preparation method |
| US20160186038A1 (en) * | 2014-12-31 | 2016-06-30 | Anjieyu (Beijing) Oilfield Technical Services Co., Ltd. | Curdlan Gel Based Heat-resistant Profile Control and Water Plugging Agent |
| CN109666470A (en) * | 2018-12-05 | 2019-04-23 | 延安中杰高新工贸有限公司 | A kind of compound profile-controlling and plugging agent of nano and micro materials |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209100A (en) * | 2014-09-29 | 2014-12-17 | 大连工业大学 | Method for preparing adsorbing agents by rice hulls |
| US20160186038A1 (en) * | 2014-12-31 | 2016-06-30 | Anjieyu (Beijing) Oilfield Technical Services Co., Ltd. | Curdlan Gel Based Heat-resistant Profile Control and Water Plugging Agent |
| CN105175643A (en) * | 2015-09-02 | 2015-12-23 | 莱芜市涌金化工有限公司 | Elastomeric blocking polymer particle preparation method |
| CN109666470A (en) * | 2018-12-05 | 2019-04-23 | 延安中杰高新工贸有限公司 | A kind of compound profile-controlling and plugging agent of nano and micro materials |
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