CN106350049B - Method for improving polymer flooding effect, polymer flooding composition and application thereof - Google Patents
Method for improving polymer flooding effect, polymer flooding composition and application thereof Download PDFInfo
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Abstract
The method for improving polymer flooding effect comprises the step of injecting core-shell microgel and polymer according to a volume ratio of 1: 100-1: 1 in a polymer flooding process. By using the method for improving the polymer flooding effect, the retention of polymer molecules in the deep part of the stratum can be increased, the polymer solution is controlled to flow in, and the utilization efficiency of the polymer is improved; on the basis of not increasing the polymer flooding cost, the comprehensive effect of polymer flooding is improved.
Description
Technical Field
The application relates to but is not limited to the technical field of polymer flooding oil extraction, in particular to but not limited to a method for improving polymer flooding effect, a polymer flooding composition and application thereof.
Background
Since the polymer flooding is popularized and implemented in land and offshore main oil fields in China from the last 90 th century, the polymer flooding achieves huge economic and social benefits and becomes one of the main technologies for improving the recovery rate at home and abroad at present. The key point of successful implementation of polymer flooding is to promote the retention of polymer molecules in the underground, particularly the retention of a movable oil zone in the deep part of a stratum, increase the displacement resistance of a displacement fluid and start water flooding without affecting pores. However, due to the heterogeneity of the stratum and the influence of the dominant seepage channel formed by water injection and scouring in the early stage, polymer molecules can rapidly break through to the production well, the effective displacement effect of the polymer molecules cannot be exerted, the polymer flooding implementation effect is poor, and the input-output ratio is reduced.
In order to delay polymer breakthrough, the following main proposals are currently made: firstly, adding a cross-linking agent to form a network cross-linked polymer (weak) gel, and forming retention in formation pores through space occupation of large-scale molecules; secondly, part of cationic polymer is injected alternately, and polymer breakthrough is delayed by utilizing the property of negative charge of the conventional polymer and through the charge adsorption effect. However, both methods have certain drawbacks: if the cross-linking agent is added, due to the chromatographic separation effect between the cross-linking agent and polymer macromolecules, the actual gelling effect at the deep part of the stratum is limited, and effective retention at a target stratum is difficult to realize really; if the cationic polymer is added, the stratum is negatively charged, so that the cationic polymer inevitably has adsorption with the stratum, the adsorption loss is huge in the mass transfer process to the deep part of the stratum, and the problem of limited trapping capacity for the oil displacement polymer in the deep part of the stratum also exists. With the lapse of time, the residual oil saturation of the near-wellbore zone is lower and lower, and both methods are difficult to really improve the retention capacity of polymer molecules in the deep part of the stratum, so that the implementation effect is poorer and poorer.
Therefore, there is a need to develop a method for improving polymer flooding that meets the current situational needs.
Disclosure of Invention
The application provides a method for improving polymer flooding effect, which comprises the step of injecting core-shell microgel and polymer according to the volume ratio of 1: 100-1: 1 in the polymer flooding process.
The core-shell microgel used in the application has a core-shell structure, the shell is provided with anions, the interior is provided with cations, and substances capable of releasing the cations in the interior after water absorption can be released, and the complete hydration and expansion time is about 30 days. The core-shell microgel used in the present application may be a material prepared by a method known in the art, such as a core-shell self-crosslinking acrylamide copolymer prepared by a method disclosed in chinese patent application No. 200510107824.
In some embodiments, the volume ratio of the core-shell microgel to the polymer may be 1:50 to 1: 2.
In some embodiments, the volume ratio of the core shell microgel to polymer may be 1: 2.
In some embodiments, the injections may be alternating injections or simultaneous injections.
In some embodiments, the implant may be an alternating implant.
In some embodiments, the polymer may be an anionic polyacrylamide, a modified salt-resistant polymer of an anionic polyacrylamide, or a hydrophobically associative polymer of an anionic polyacrylamide.
The anionic polyacrylamide modified salt-resistant polymer and the hydrophobically associating polymer used herein are conventional commercially available products. For example, the hydrophobically associative polymer of anionic polyacrylamide may be AP-P4.
In some embodiments, the core-shell microgel may have a primary particle size of 300-1500nm, which may reach tens of microns after complete swelling.
The application also provides a polymer flooding composition, which comprises a core-shell microgel and a polymer, wherein the core-shell microgel comprises a core part consisting of a water-soluble neutral monomer acrylamide, an ionic monomer I and a cross-linking agent copolymer, wherein the mass ratio of the acrylamide monomer to the ionic monomer I is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the core monomers; the shell part is formed by a copolymer of water-soluble neutral monomer acrylamide, an ionic monomer II and a cross-linking agent, wherein the mass ratio of the acrylamide monomer to the ionic monomer II is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the shell monomer; ionic monomer I has an opposite charge to ionic monomer II;
the ionic monomer I is selected from at least one of the group consisting of beta-amino ethyl acrylic acid hydrochloride, beta-amino ethyl acrylic acid sulfate, methacryloyloxyethyl trimethyl ammonium chloride, N-dimethylamino ethyl acrylic acid hydrochloride, N-dimethylamino ethyl acrylic acid sulfate, beta-amino ethyl methacrylic acid sulfate, allyl amine salt, allyl alkyl salt, (methyl) acrylic ester quaternary ammonium salt and methacryloyloxyethyl dimethyl butyl ammonium bromide;
the ionic monomer II is at least one selected from the group consisting of acrylic acid or acrylate, methacrylic acid or methacrylate, 2-acrylamido-2-methylpropane sulfonate, alpha-olefin sulfonate and beta-allyl sulfonate.
In some embodiments, the volume ratio of the core-shell microgel to the polymer may be 1:100 to 1: 1.
The application also provides the application of the polymer flooding composition as described above as an oil displacement agent in a polymer flooding process.
The action mechanism of the application is as follows: the shell of the core-shell microgel is anion, the surface of the stratum is negatively charged, and the shell of the core-shell microgel has small adsorption quantity to the stratum. The core-shell microgel absorbs water along with entering the deep part of the stratum and then releases cations in the core-shell microgel, wherein the cations are strong adsorption factors, so that the core-shell microgel can be adsorbed on the surface of oil reservoir rocks to generate an anchoring effect and can also generate an opposite charge attraction effect with a polymer, the detention of polymer molecules in the deep part of the stratum is increased, the displacement efficiency is improved, meanwhile, the particle size of the core-shell microgel can reach an equal pore size, the core-shell microgel has a plugging effect on an underground polymer flooding dominant seepage channel, a subsequent polymer solution is further diverted to the stratum with high residual oil saturation, the swept volume of polymer flooding is enlarged, and the implementation effect of polymer flooding is improved.
The application has the following advantages:
(1) the retention of polymer molecules in the deep part of the stratum is increased, the polymer solution is controlled to flow in, and the utilization efficiency of the polymer is improved.
(2) On the basis of not increasing the polymer flooding cost, the comprehensive effect of polymer flooding is improved.
Drawings
Fig. 1 is a graph showing the pressure change during injection in example 1 and comparative example 1.
Fig. 2 is a graph showing changes in water content and recovery ratio during injection in example 1 and comparative example 1.
Fig. 3 is a comparative graph of the appearance of the cores of example 1 and comparative example 1 after polymer flooding was completed.
Detailed Description
Embodiments of the present application are described below by way of examples, and it should be appreciated by those skilled in the art that these specific examples merely illustrate selected embodiments for achieving the purposes of the present application and are not intended to limit the technical solutions. Modifications of the technical solutions of the present application in combination with the prior art are obvious from the teachings of the present application and fall within the protection scope of the present application.
The starting materials or reagents used in the following examples are, unless otherwise specified, conventional commercially available products.
Example 1
The core-shell microgel is prepared according to the method disclosed in chinese patent application No. 200510107824.X, for example, the method disclosed in example 3 thereof.
A three-layer heterogeneous pressing model (hypotonic 0.75 mu m) of 4.5cm x 30cm is adopted indoors2Middle permeating 2 μm2Permeability 6 μm2) The prepared core-shell microgel of 0.1PV and anionic polyacrylamide of 0.2PV are injected into the rock core in an alternating injection mode according to a method commonly used in the field, and specifically, the core-shell microgel of 0.1PV is injected firstly, and then the anionic polyacrylamide of 0.2PV is injected.
Example 2
This example differs from example 1 in that the core-shell microgel and anionic polyacrylamide are mixed and injected into the core at the same time.
Comparative example 1
This comparative example differs from example 1 in that 0.3PV of a single anionic polyacrylamide was injected into the core.
Performance testing
(1) Pressure during injection
As can be seen from fig. 1, there is a great difference in the dynamic law between the two during the injection process: the single polymer flood exhibited a pressure drop or wave-like characteristic after the injection process was completed, since the pressure was expelled with the crude oil, indicating that the polymer was expelled very quickly and no more crude oil was expelled, the experiment was completed around 3PV (water content over 98%); while the pressure in the injection process of example 1 is continuously increased in the subsequent water flooding process, crude oil is still driven out even when the pressure exceeds 10PV in the experiment, because the polymer is trapped by the microgel of the core-shell structure in the core, a micelle or aggregate structure with larger size is formed, the retention amount of polymer molecules in the core is increased, and the polymer flooding effect is improved.
(2) Contrast in Displacement Effect
Table 1 shows the displacement effect of example 1 and comparative example 1.
TABLE 1
| System of | (maximum increase in Displacement pressure), MPa | Enhanced oil recovery ratio% |
| Example 1 | 0.96 | 28.44 |
| Comparative example 1 | 0.70 | 17.90 |
As can be seen from Table 1, the recovery ratio can be improved by 17.90% by a single polymer flooding, while the recovery ratio can be improved by 28.44% by example 1 after the core-shell microgel is added, and the improvement effect is very obvious, which indicates that the addition of the core-shell microgel is very effective.
As can be seen from FIG. 2, the effects of reducing the water content of the core-shell microgel and the polymer matrix are basically similar, but the subsequent water flooding process of the example 1 can reach 5PV, while the subsequent water flooding process of the single polymer flooding is only about 3PV, which shows that the effective period of the polymer flooding is greatly prolonged by adding the core-shell microgel, and the migration speed of the polymer in the core is reduced.
(3) Post-displacement core
As can be seen in fig. 3, the core of example 1 was lighter in color and cleaner at the end of the polymer flooding, indicating that more crude oil was displaced, i.e., the addition of microgel increased the polymer flooding effect.
Those skilled in the art should understand that the equivalent embodiments of the present application include many modifications, modifications and evolutions while utilizing the technical content disclosed above, without departing from the scope of the present application; meanwhile, any equivalent changes, modifications and evolutions of the above embodiments according to the essential technology of the present application are within the scope of the present application defined by the claims.
Claims (8)
1. A method for improving polymer flooding effect comprises the steps of injecting core-shell microgel and polymer according to the volume ratio of 1: 50-1: 2 in the polymer flooding process, wherein the core-shell microgel comprises a core part consisting of water-soluble neutral monomer acrylamide, ionic monomer I and cross-linking agent copolymer, the mass ratio of the acrylamide monomer to the ionic monomer I is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the core monomers; the shell part is formed by a copolymer of water-soluble neutral monomer acrylamide, an ionic monomer II and a cross-linking agent, wherein the mass ratio of the acrylamide monomer to the ionic monomer II is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the shell monomer; ionic monomer I has an opposite charge to ionic monomer II;
the ionic monomer I is at least one selected from the group consisting of beta-amino ethyl acrylic acid hydrochloride, beta-amino ethyl acrylic acid sulfate, methacryloyloxyethyl trimethyl ammonium chloride, N-dimethylamino ethyl acrylic acid hydrochloride, N-dimethylamino ethyl acrylic acid sulfate, beta-amino ethyl methacrylic acid sulfate, allyl amine salt, allyl alkyl salt, (meth) acrylic ester quaternary ammonium salt and methacryloyloxyethyl dimethyl butyl ammonium bromide;
the ionic monomer II is at least one selected from the group consisting of acrylic acid or acrylate, methacrylic acid or methacrylate, 2-acrylamido-2-methylpropane sulfonate, alpha-olefin sulfonate and beta-allyl sulfonate;
the polymer is anionic polyacrylamide, a modified salt-resistant polymer of anionic polyacrylamide or a hydrophobic association polymer of anionic polyacrylamide.
2. The method of claim 1, wherein the volume ratio of the core shell microgel to polymer is 1: 2.
3. The method of any of claims 1-2, wherein the implanting is alternating implanting or simultaneous implanting.
4. The method of claim 3, wherein the implanting is an alternating implanting.
5. The method of claim 1 wherein the hydrophobically associative polymer of anionic polyacrylamide is AP-P4.
6. The method as set forth in claim 1, wherein the core-shell microgel has a primary particle size of 300-1500nm, which can reach several tens of microns after complete swelling.
7. A polymer flooding composition comprises a core-shell microgel and a polymer, wherein the core-shell microgel comprises a core part consisting of a water-soluble neutral monomer acrylamide, an ionic monomer I and a cross-linking agent copolymer, wherein the mass ratio of the acrylamide monomer to the ionic monomer I is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the core monomers; the shell part is formed by a copolymer of water-soluble neutral monomer acrylamide, an ionic monomer II and a cross-linking agent, wherein the mass ratio of the acrylamide monomer to the ionic monomer II is 1: 20-30: 1, and the cross-linking agent accounts for 0.0001-15 wt% of the total mass of the shell monomer; ionic monomer I has an opposite charge to ionic monomer II;
the ionic monomer I is selected from at least one of the group consisting of beta-amino ethyl acrylic acid hydrochloride, beta-amino ethyl acrylic acid sulfate, methacryloyloxyethyl trimethyl ammonium chloride, N-dimethylamino ethyl acrylic acid hydrochloride, N-dimethylamino ethyl acrylic acid sulfate, beta-amino ethyl methacrylic acid sulfate, allyl amine salt, allyl alkyl salt, (methyl) acrylic ester quaternary ammonium salt and methacryloyloxyethyl dimethyl butyl ammonium bromide;
the ionic monomer II is at least one selected from the group consisting of acrylic acid or acrylate, methacrylic acid or methacrylate, 2-acrylamido-2-methylpropane sulfonate, alpha-olefin sulfonate and beta-allyl sulfonate;
the polymer is anionic polyacrylamide, a modified salt-resistant polymer of anionic polyacrylamide or a hydrophobic association polymer of anionic polyacrylamide;
the volume ratio of the core-shell microgel to the polymer is 1: 50-1: 2.
8. Use of the polymer flooding composition of claim 7 as an oil displacing agent in a polymer flooding process.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1940008A (en) * | 2005-09-30 | 2007-04-04 | 中国科学院理化技术研究所 | Deep adjusting water blocking agent of self-crosslinked shell acrylamide multipolymer and its production |
| CN102399345A (en) * | 2010-09-14 | 2012-04-04 | 中国科学院理化技术研究所 | Emulsion deep profile/displacement control agent and preparation method of emulsion deep profile/displacement control agent containing gel microspheres of core shell structure |
| CN103739777A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and preparation method thereof |
| CN103739778A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1940008A (en) * | 2005-09-30 | 2007-04-04 | 中国科学院理化技术研究所 | Deep adjusting water blocking agent of self-crosslinked shell acrylamide multipolymer and its production |
| CN102399345A (en) * | 2010-09-14 | 2012-04-04 | 中国科学院理化技术研究所 | Emulsion deep profile/displacement control agent and preparation method of emulsion deep profile/displacement control agent containing gel microspheres of core shell structure |
| CN103739777A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell type cationic/anionic polyacrylamide profile control oil displacing microsphere and preparation method thereof |
| CN103739778A (en) * | 2014-01-08 | 2014-04-23 | 天津大学 | Core-shell polyacrylamide microsphere profile controlling oil displacement agent and preparation method thereof |
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