CN114907826B - Targeting deep profile control agent and preparation method and application thereof - Google Patents
Targeting deep profile control agent and preparation method and application thereof Download PDFInfo
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- CN114907826B CN114907826B CN202210592659.5A CN202210592659A CN114907826B CN 114907826 B CN114907826 B CN 114907826B CN 202210592659 A CN202210592659 A CN 202210592659A CN 114907826 B CN114907826 B CN 114907826B
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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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention belongs to the technical field of water shutoff and control of an oil-water well, and particularly relates to a targeting deep profile control agent, a preparation method and application thereof. The preparation method comprises the following steps: s1, adding a gel carrier into water, and stirring until floccules are fully dissolved to obtain a solution A; adding a time control factor into the thermosetting polymer at room temperature, and stirring until the time control factor is fully dissolved and no floccule exists, so as to obtain liquid B; s2, adding the solution A obtained by the step S1 into the solution B obtained by the step S1 under the stirring state at room temperature, and uniformly mixing to obtain the targeted deep profile control agent. The profile control agent prepared by the invention is a phase-change solidification controllable multi-scale plugging system, the temperature of a stratum is tested to adjust the content of partial components in the system, and the regulation and control of emulsion phase-change time factors are realized, so that the solidification of the plugging agent at the design position of the stratum is precisely controlled, and the purpose of targeted profile control is realized.
Description
Technical Field
The invention belongs to the technical field of water shutoff and control of an oil-water well, and particularly relates to a targeting deep profile control agent, a preparation method and application thereof.
Background
Once the dominant channel is formed in the water flooding process, the water content is more than 70%, the flushing is repeated, and the residual oil cannot be extracted, so that a great amount of resource waste is caused. The water flooding development is used as a main means for improving the recovery ratio of the oil reservoir, and has extremely wide application. Water flooding efficiency = sweep volume EV x wash oil efficiency ED of water flooding reservoir, profile control is to balance and improve the sweep volume of water absorption profile between layers, profile control is to improve the sweep volume in injected water layer, and water shutoff is to block the dominant channel. In order to improve the oil displacement efficiency, in recent years, the common profile control and water shutoff technologies at home and abroad comprise technical systems such as gel, water swelling body, polymer microspheres and the like; the gel is crosslinked underground, so that the gel is greatly influenced by the conditions of formation temperature, water preparation and the like, particularly by the shearing influence of formation pores, has obvious viscosity loss and shorter profile control effective period, is easy to form continuous blockage, and greatly increases the water injection pressure or prevents water injection; the water swelling body is solid-phase particles, swells when meeting water, is easy to accumulate in near-wellbore zones, causes quick boosting of a wellbore, and is blocked near-wellbore and can not reach the far end of a stratum.
Therefore, in the driving and regulating integration, the factors such as the mineralization degree, the temperature, the pH value and the like of the formation fluid influence the driving agent, so that the uncertainty of the driving and regulating effect is caused. Therefore, the emulsion phase change time is regulated and controlled, so that the solidification of the profile control agent at the stratum design position is controlled, the targeted deep profile control is realized, and the certainty of the profile control effect is improved.
Disclosure of Invention
In order to solve the problems, the invention provides the targeted deep profile control agent, the preparation method and the application thereof, wherein the gel carrier carries a phase-change solidification controllable multi-scale plugging system, the temperature of a stratum is tested to adjust the content of partial components in the system, and the regulation and control of emulsion phase-change time factors are realized, so that the solidification of the plugging agent at the stratum design position is accurately controlled, and the purpose of targeted profile control is realized.
The invention solves the technical problems through the following technical proposal.
The invention provides a preparation method of a targeting deep profile control agent, which comprises the following steps:
s1, adding a gel carrier into water, and stirring until the gel carrier is fully dissolved and has no floccules, so as to obtain a solution A; adding a phase change control factor into the thermosetting polymer at room temperature, and stirring until the phase change control factor is fully dissolved and no floccule exists, so as to obtain liquid B;
s2, obtaining a solution B; and (3) adding the solution B obtained in the step (S1) into the solution A obtained in the step (S1) at room temperature under the stirring state, and uniformly mixing to obtain the targeted deep profile control agent.
Preferably, in S1, the gel carrier is polyacrylamide and/or xanthan gum;
preferably, in S1, the mass ratio of the gel carrier to the water is 1-3:100, and the stirring speed is 3000-5000r/min.
Preferably, in S1, the phase change control factor is one or more of diethylamine propylamine, boron trifluoride-monoethylamine, and m-phenylenediamine.
Preferably, in S1, the thermosetting polymer is one or more of bisphenol a epoxy resin, polyphenol glycidyl ether epoxy resin, and phenolic epoxy resin.
Preferably, in S1, the mass ratio of the time control factor to the thermosetting polymer is 1-15:100, and the stirring speed is 3000-5000r/min.
Preferably, in S2, the mass ratio of the solution A to the solution B is 100:1-5, and the stirring speed is 4000-6000r/min.
The invention provides the targeting deep profile control agent prepared by the preparation method.
The invention also provides application of the targeting deep profile control agent in low permeability oilfield water shutoff operation, comprising the following steps:
step 1, calculating the phase transition temperature of the profile control agent: obtaining phase transition temperature according to the well depth of the oil-water well reached by the flooding agent, wherein the phase transition temperature is ground temperature gradient multiplied by the well depth;
step 2, calculating phase change time of the profile control agent: obtaining longitudinal phase change time according to the injection displacement and the unit volume of the injection oil pipe, wherein the longitudinal phase change time is the injection displacement per unit volume; obtaining the time of transverse phase change according to the depth of the reservoir and the seepage speed of the injected liquid in the stratum, wherein the transverse phase change time is the depth/seepage speed of the reservoir; the phase change time is the sum of the longitudinal phase change time and the transverse phase change time;
step 3, determining the consumption of the phase change control factors: obtaining the component proportion of the phase change control factor in the profile control agent emulsion according to the phase change temperature and the phase change time, and preparing the profile control agent emulsion;
step 4, targeted injection: and carrying out targeted injection on the profile control agent emulsion at the set injection pressure and injection displacement, and gradually hydrating the carrier after the profile control agent emulsion reaches the position, so that the phase change control factor and the thermosetting polymer are subjected to polymerization reaction and solidification, and the solidification of the plugging agent at the stratum design position is accurately controlled.
Preferably, the use temperature of the targeted deep profile control agent is 20-160 ℃, and the curing time is 4-400h.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention provides a targeted deep profile control agent, which is characterized in that a gel carrier carries a phase-change solidification controllable multi-scale plugging system, the temperature of a stratum is tested to adjust the content of partial components in the system, and the regulation and control of emulsion phase-change time factors are realized, so that the solidification of the plugging agent at the design position of the stratum is accurately controlled, and the purpose of targeted profile control is realized.
(2) According to the invention, the liquid of the profile control agent is injected on the ground, the viscosity of the profile control agent before solidification is 5-100 mPa.s, the profile control agent is easy to inject, the system does not contain any particulate matters, the profile control agent is only influenced by the temperature of the stratum, the profile control agent is not influenced by factors such as the mineralization degree and the pH value of underground fluid, the time control factor is subjected to polymerization reaction with the thermosetting polymer, the strength is high after phase transition, the steering capability is high, the phase transition time is adjustable, the profile control agent is solidified within a set time (4-400 h), the profile control agent can be moved for more than 15 days in the stratum, the deep profile control can be realized, the performance is stable, and the adaptability is wide.
(3) The invention provides a targeting deep profile control agent, which is characterized in that when the profile control agent is used for deep profile control, a carrier is hydrated, a targeting plugging agent is changed from a liquid phase to a solid phase, particles of a discontinuous phase are formed, the particles are granulated, solidified and distributed in a scattered manner, continuous blockage is not formed, an advantageous channel is blocked, water and oil are not blocked, and the blocking is not dead.
(4) The targeted deep profile control agent provided by the invention has good environmental tolerance, is insoluble in water and oil, is not influenced by dilution and mineralization of formation water, has good selective plugging effect, can completely reach a plugging set position, does not influence the consolidation strength of the profile control agent, and is resistant to strong acid, strong alkali and H at high temperature after solidification 2 S、CO 2 The corrosion is long in effective period, not easy to degrade, low in construction cost, low in concentration and large in dosage.
Drawings
FIG. 1 is a graph showing the effect of pH change on the viscosification of the conditioning agent of example 1 in accordance with the present invention;
FIG. 2 is a graph showing the effect of mineralization on the performance of the flooding agent of example 1;
FIG. 3 is a graph showing the thickening profile of the conditioning flooding agent of examples 1-3 at a temperature of 50 ℃ according to the present invention;
FIG. 4 is a graph showing the thickening profile of the conditioning flooding agent of examples 1-3 at 80℃according to the present invention;
FIG. 5 is a thickening profile of the conditioning flooding agent of examples 1-3 at 130 ℃ according to the present invention;
FIG. 6 is a diagram of the water shutoff effect of the oil well simulated by the flooding agent in embodiment 1 of the invention;
FIG. 7 is a graph of the profile control agent of example 1 of the present invention versus water shutoff for a formation having a permeability of 353mD and a water cut of 70%;
FIG. 8 is a graph of the flooding agent vs. permeability 387mD and water content 80% for example 1;
FIG. 9 is a graph of the profile control agent of example 1 of the present invention versus water plugging in a formation having a permeability of 492mD and a water content of 90%.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the technical terms used in the present invention are only for describing specific embodiments, and are not intended to limit the scope of the present invention, and various raw materials, reagents, instruments and equipment used in the following embodiments of the present invention may be purchased commercially or prepared by existing methods unless otherwise specifically described.
Example 1
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 3g of polyacrylamide into 100g of water, and stirring at a rotating speed of 3000r/min until the polyacrylamide is fully dissolved and floccules are not formed, so as to obtain solution A for later use; adding 15g of time control factor diethylaminopropylamine into 100g of bisphenol A epoxy resin at room temperature, stirring at a rotating speed of 3000r/min until floccules are sufficiently dissolved, and obtaining solution B for later use;
s2, adding 100gA liquid obtained by S1 into 5gB liquid obtained by S1 at a rotating speed of 6000r/min under stirring at room temperature, and uniformly mixing to obtain the targeted deep profile control agent.
Example 2
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 1g of polyacrylamide and 1g of xanthan gum into 100g of water, and stirring at a rotating speed of 4000r/min until the mixture is fully dissolved and has no floccules, so as to obtain solution A for later use;
adding 10g of time control factor boron trifluoride-monoethylamine into 50g of bisphenol A type epoxy resin and 50g of polyphenol type glycidyl ether epoxy resin mixture at room temperature, stirring at the rotating speed of 4000r/min until floccules are fully dissolved, and obtaining solution B for later use;
s2, adding the 3gB liquid obtained in the S1 into the 100gA liquid obtained in the S1 at the rotation speed of 5000r/min under stirring at room temperature, and uniformly mixing to obtain the targeted deep profile control agent.
Example 3
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 1.5g polyacrylamide and 1.5g xanthan gum into 100g water, stirring at a rotating speed of 5000r/min until floccules are sufficiently dissolved, and obtaining solution A for later use;
adding time control factors of 5g diethylaminopropylamine and 5g boron trifluoride-monoethylamine into a mixture of 50g bisphenol A epoxy resin and 50g polyphenol type glycidyl ether epoxy resin at a rotating speed of 5000r/min, and stirring until floccules are fully dissolved, so as to obtain solution B for later use;
s2, adding 100gA liquid obtained by S1 into 5gB liquid obtained by S1 at a rotating speed of 6000r/min under stirring at room temperature, and uniformly mixing to obtain the targeted deep profile control agent.
Example 4
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 2g of xanthan gum into 100g of water, and stirring at a rotating speed of 3000r/min until the xanthan gum is fully dissolved and has no floccules, so as to obtain solution A for later use;
adding 8g of time control factor m-phenylenediamine into 100g of polyphenol type glycidyl ether epoxy resin at room temperature, stirring at a rotating speed of 3000r/min until floccules are fully dissolved, and obtaining solution B for later use;
s2, adding 100gA liquid obtained by S1 into 2gB liquid obtained by S1 at the rotation speed of 4000r/min under stirring at room temperature, and uniformly mixing to obtain the targeted deep profile control agent.
Example 5
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 1g of polyacrylamide into 100g of water, and stirring at a rotating speed of 3000r/min until the polyacrylamide is fully dissolved and floccules are not formed, so as to obtain solution A for later use;
adding 15g of time control factor boron trifluoride-monoethylamine into 50g of bisphenol A epoxy resin and 50g of phenol glycidyl ether epoxy resin mixture at room temperature, stirring at a rotating speed of 3000r/min until the mixture is fully dissolved and has no floccules, and obtaining solution B for later use;
s2, adding 100gA liquid obtained by S1 into 1gB liquid obtained by S1 at a rotating speed of 6000r/min under stirring at room temperature, and uniformly mixing to obtain the targeted deep profile control agent.
Example 6
A preparation method of a targeted deep profile control agent comprises the following steps:
s1, adding 2g of polyacrylamide and 1g of xanthan gum into 100g of water, and stirring at a rotating speed of 3000r/min until floccules are sufficiently dissolved, so as to obtain solution A for later use;
adding time control factor 4g boron trifluoride-monoethylamine and 6g m-phenylenediamine into 100g polyphenol type glycidyl ether epoxy resin at room temperature, stirring at a rotating speed of 3000r/min until floccules are fully dissolved, and obtaining solution B for later use;
s2, adding the 2.5gB liquid obtained in the S1 into the 100gA liquid obtained in the S1 at the rotation speed of 6000r/min under the stirring state, and uniformly mixing to obtain the targeted deep profile control agent.
The targeted deep profile control agent prepared in example 1 was subjected to consistency change measurement by using an OWC-2250 normal pressure thickener under the conditions of different pH values of 1, 6 and 13 at 80 ℃ for 8 hours, and the test results are shown in FIG. 1. As can be seen from fig. 1, the thickening curves of the targeted deep profile control agent prepared in example 1 at three different pH values are substantially coincident, so that it can be seen that the acid base has substantially no effect on the curing time of the targeted deep profile control agent.
The targeted deep profile control agent prepared in the embodiment 1 is respectively taken to 5000mg/L of sodium chloride with the content of 30000mg/L, 60000mg/L, 90000mg/L, 120000mg/L and 150000mg/L, calcium ions and magnesium ions, the samples are respectively placed in an incubator at 80 ℃, the solidification condition of the profile control agent is observed, and the test result is shown in figure 2. As can be seen from fig. 2, mineralization has substantially no effect on the curing of the targeted deep profile control agent.
The temperature of the Jungqing dwarfism stratum well was simulated, the targeting deep profile control agent prepared in examples 1-3 was placed in an incubator at 50 ℃, 80 ℃ and 130 ℃ respectively, and the setting time was observed as shown in FIGS. 3-5.
As can be seen from fig. 3, the initial setting time of the targeting deep profile control agent prepared in example 1 is 312h (13 d) and the complete curing time is 504h (21 d) at 50 ℃; the initial setting time of the targeting deep profile control agent prepared in example 2 is 200h (8.3 d), and the complete curing time is 352h (14.6 d); the initial setting time of the targeting deep profile control agent prepared in example 3 was 160h (6.7 d) and the complete curing time was 288h (12 d).
As can be seen from fig. 4, the initial setting time of the targeting deep profile control agent prepared in example 1 is 160h (6.7 d) and the complete curing time is 350h (14.5 d) at 80 ℃; the initial setting time of the targeting deep profile control agent prepared in example 2 is 88h (3.7 d), and the complete curing time is 260h (10.8 d); the initial setting time of the targeting deep profile control agent prepared in example 3 was 67h (2.8 d) and the complete curing time was 190h (7.9 d).
As can be seen from fig. 5, the initial setting time of the targeting deep profile control agent prepared in example 1 is 136h (5.7 d) and the complete curing time is 192h (8 d) at 130 ℃; the initial setting time of the targeting deep profile control agent prepared in example 2 is 230h (9.6 d), and the complete curing time is 288h (12 d); the initial setting time of the targeting deep profile control agent prepared in example 3 was 330h (13.75 d) and the complete curing time was 408h (17 d).
Quartz sand (20-40 meshes) is added into the U-shaped pipe to form a sand filling pipe simulated stratum, then the simulated water flooding well is submerged with water, the targeted deep profile control agent prepared in the embodiment 1 is extruded to simulate the well temperature of 80 ℃ and placed in a constant temperature box, and after 10h phase transition, the water plugging effect is observed, and the result is shown in figure 6. As can be seen from fig. 6, after the targeted deep profile control agent prepared in example 1 is blocked, a complete water-resistant layer is formed, and the blocking effect is remarkable.
The targeted deep profile control agent prepared in example 1 was used to simulate formations with different permeabilities from low to high using a sand filling pipe, 0.3PV of the targeted deep profile control agent prepared in example 1 was added to the sand filling pipe, and after complete solidification, the plugging effect was tested as shown in fig. 7-9 and table 1.
As can be seen from fig. 7 and table 1, when the recovery ratio is increased to 64.38% during primary water flooding, the water content at the outlet end reaches 70%, at this time, the targeting deep profile control agent prepared in example 1 of 0.3PV is reversely injected, and secondary water flooding is performed after curing and aging. When secondary water flooding is carried out, after the profile control agent is broken through along with the increase of injection pressure, oil flow appears at the outlet section, the recovery ratio is increased from 64.38% to 81.48%, the recovery ratio is stable, and the recovery ratio is improved by 17.1%; when the profile control agent is broken through, the water content of the produced liquid is reduced to about 30% at maximum, and the water content rises again along with displacement. From the results, the profile control agent has good dewatering and oil increasing effects on stratum with 353mD permeability and 70% water content.
As can be seen from fig. 8 and table 1, when the recovery ratio is increased to 66.3% during primary water flooding, the water content at the outlet end reaches 80%, at this time, the targeting deep profile control agent prepared in example 1 of 0.3PV is reversely injected, and secondary water flooding is performed after curing and aging. When secondary water flooding is carried out, after the profile control agent is broken through along with the increase of injection pressure, oil flow appears at the outlet section, the recovery ratio is increased from 66.3% to 85.58%, the recovery ratio is stable, and the recovery ratio is increased by 19.28%; and when the profile control agent is broken through, the water content of the produced liquid is reduced to about 26% at maximum, and the water content rises again along with displacement. From the results, the profile control agent has better dewatering and oil increasing effects on stratum with the permeability of 387mD and the water content of 80%.
As can be seen from fig. 9 and table 1, when the recovery ratio is increased to 75.48% during primary water flooding, the water content at the outlet end reaches 90%, at this time, the targeting deep profile control agent prepared in example 1 of 0.3PV is reversely injected, and secondary water flooding is performed after curing and aging. When secondary water flooding is carried out, after the profile control agent is broken through along with the increase of injection pressure, oil flow appears at the outlet section, the recovery ratio is increased from 75.48% to 88.53%, the recovery ratio is stable, and the recovery ratio is increased by 13.05%; and when the profile control agent is broken through, the water content of the produced liquid is reduced to about 28% at maximum, and the water content rises again along with displacement. From the results, the profile control agent has better dewatering and oil increasing effects on stratum with the permeability of 492mD and the water content of 90%.
TABLE 1 Water blocking test results at different Water contents
It should be noted that, when numerical ranges are referred to in the present invention, it should be understood that two endpoints of each numerical range and any numerical value between the two endpoints are optional, and because the adopted step method is the same as the embodiment, in order to prevent redundancy, the present invention describes a preferred embodiment. While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The preparation method of the targeting deep profile control agent is characterized by comprising the following steps of:
s1, adding a gel carrier into water, and stirring until the gel carrier is fully dissolved and has no floccules, so as to obtain a solution A; adding a phase change control factor into the thermosetting polymer at room temperature, and stirring until the phase change control factor is fully dissolved and no floccule exists, so as to obtain liquid B;
the phase change control factor is one or two of diethylaminopropylamine and boron trifluoride-monoethylamine;
the gel carrier is polyacrylamide and/or xanthan gum;
the thermosetting polymer is one or more of bisphenol A type epoxy resin, polyphenol type glycidyl ether epoxy resin and phenolic epoxy resin;
the mass ratio of the gel carrier to the water is 1-3:100;
the mass ratio of the phase change control factor to the thermosetting polymer is 1-15:100;
s2, adding the solution B obtained in the step S1 into the solution A obtained in the step S1 in a stirring state at room temperature, and uniformly mixing to obtain the targeted deep profile control agent;
the mass ratio of the liquid A to the liquid B is 100:1-5.
2. The method for preparing the targeted deep profile control agent according to claim 1, wherein in the step S1, the stirring speed is 3000-5000r/min.
3. The method for preparing the targeted deep profile control agent according to claim 1, wherein in the step S2, the stirring speed is 4000-6000r/min.
4. A targeted deep profile control agent prepared according to the preparation method of any one of claims 1-3.
5. The use of the targeted deep profile control agent of claim 4 in low permeability oilfield water shutoff operations comprising the steps of:
step 1, calculating the phase transition temperature of the profile control agent: obtaining phase transition temperature according to the well depth of the oil-water well reached by the flooding agent, wherein the phase transition temperature is ground temperature gradient multiplied by the well depth;
step 2, calculating phase change time of the profile control agent: obtaining longitudinal phase change time according to the injection displacement and the unit volume of the injection oil pipe, wherein the longitudinal phase change time is the injection displacement per unit volume; obtaining the time of transverse phase change according to the depth of the reservoir and the seepage speed of the injected liquid in the stratum, wherein the transverse phase change time is the depth/seepage speed of the reservoir; the phase change time is the sum of the longitudinal phase change time and the transverse phase change time;
step 3, determining the consumption of the phase change control factors: obtaining the component proportion of the phase change control factor in the profile control agent emulsion according to the phase change temperature and the phase change time, and preparing the profile control agent emulsion;
step 4, targeted injection: and carrying out targeted injection on the profile control agent emulsion at the set injection pressure and injection displacement, and gradually hydrating the carrier after the profile control agent emulsion reaches the position, so that the phase change control factor and the thermosetting polymer are subjected to polymerization reaction and solidification, and the solidification of the plugging agent at the stratum design position is accurately controlled.
6. The use according to claim 5, wherein the targeted deep profile control agent is used at a temperature of 20-160 ℃ and a curing time of 4-400h.
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