CN111763507B - Strength-adjustable star polymer gel foam profile control agent and preparation and application thereof - Google Patents
Strength-adjustable star polymer gel foam profile control agent and preparation and application thereof Download PDFInfo
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- CN111763507B CN111763507B CN201910261691.3A CN201910261691A CN111763507B CN 111763507 B CN111763507 B CN 111763507B CN 201910261691 A CN201910261691 A CN 201910261691A CN 111763507 B CN111763507 B CN 111763507B
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- 239000006260 foam Substances 0.000 title claims abstract description 142
- 229920000642 polymer Polymers 0.000 title claims abstract description 135
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 25
- 239000004088 foaming agent Substances 0.000 claims abstract description 19
- 239000003381 stabilizer Substances 0.000 claims abstract description 18
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 229920003169 water-soluble polymer Polymers 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 14
- -1 alkyl glycoside Chemical class 0.000 claims description 12
- 230000033558 biomineral tissue development Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229930182470 glycoside Natural products 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- CQRYARSYNCAZFO-UHFFFAOYSA-N salicyl alcohol Chemical compound OCC1=CC=CC=C1O CQRYARSYNCAZFO-UHFFFAOYSA-N 0.000 claims description 8
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000003876 biosurfactant Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
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- 238000011161 development Methods 0.000 claims description 5
- 230000018109 developmental process Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
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- 239000011780 sodium chloride Substances 0.000 description 5
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
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- 230000015572 biosynthetic process Effects 0.000 description 4
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- 230000008569 process Effects 0.000 description 4
- 239000004604 Blowing Agent Substances 0.000 description 3
- 229910021555 Chromium Chloride Inorganic materials 0.000 description 3
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- LMODBTYAMBSWQE-UHFFFAOYSA-N (2-hydroxyphenyl)methanetriol Chemical compound OC1=CC=CC=C1C(O)(O)O LMODBTYAMBSWQE-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- LWZFANDGMFTDAV-BURFUSLBSA-N [(2r)-2-[(2r,3r,4s)-3,4-dihydroxyoxolan-2-yl]-2-hydroxyethyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O LWZFANDGMFTDAV-BURFUSLBSA-N 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
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- 239000004202 carbamide Substances 0.000 description 2
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- 150000002338 glycosides Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 229920001568 phenolic resin Polymers 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 235000011067 sorbitan monolaureate Nutrition 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- 241000032989 Ipomoea lacunosa Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
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- 238000006297 dehydration reaction Methods 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 description 1
- 229960001484 edetic acid Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000009991 scouring Methods 0.000 description 1
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- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
Images
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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
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
- C09K8/518—Foams
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a strength-adjustable star polymer gel foam profile control agent and preparation and application thereof. The strength-adjustable star polymer gel foam profile control agent comprises the following components in percentage by mass: 0.1-0.3% of star polymer, 0.1-0.3% of stabilizer, 0.2-0.4% of cross-linking agent, 0.1-0.5% of foaming agent and the balance of water; the star polymer is a water-soluble polymer which is composed of a star nucleus and a plurality of super polymer molecular chains and has strong salt resistance and temperature resistance. The star polymer gel foam profile control agent disclosed by the invention is simple in preparation, long in stabilization time under a high-temperature condition of foam, good in salt tolerance, capable of realizing adjustable strength of gel foam, and good in profile control and flooding effects on heterogeneous oil reservoirs and low-permeability fracture oil reservoirs.
Description
Technical Field
The invention belongs to the field of oil and gas field development. In particular to a strength-adjustable star polymer gel foam profile control agent and preparation and application thereof.
Background
The biggest problem of foam profile control is instability of foam, and conventional water-based foam is usually destroyed under the condition that the foam does not work, so that a series of negative effects such as gas channeling, reduction of sweep efficiency, reduction of displacement efficiency and the like are caused, and the popularization and application of the foam profile control are limited. The gel foam is a dispersion system with gas uniformly dispersed in gel, and is mainly formed by foaming a foaming agent, a cross-linking agent and a polymer solution under the action of gas, and a stabilizing agent and the cross-linking agent in a foam wall react to form a three-dimensional net-shaped space structure to form a foam framework, so that the gel foam has stability and strength which are difficult to compare with common foam. At present, the strength of gel foam generated by a main system formula is difficult to regulate and control, the system has poor temperature resistance and salt tolerance, the long-term stability needs to be improved, and the gel foam which is an excellent foam system is still difficult to exert the due advantages in the field of plugging and oil displacement.
The patent CN108219761A provides a foam gel plugging agent for plugging an air cone, and the foam gel plugging agent comprises the following components in percentage by mass: 5.5 to 6.5 percent of xanthan gum, 0.2 to 0.3 percent of hydrolyzed polypropylene amide, 0.2 to 0.25 percent of phenolic resin cross-linking agent, 0.5 to 0.6 percent of dodecyl dimethyl amine oxide and the balance of water. Although the phenolic resin system cross-linking agent has good high temperature resistance, the gelling speed is too low, and if the gel foam is prepared by using a gelling mode after foaming, the cross-linking time is far longer than the half-life of the foam, and the gel foam cannot be formed at all.
Disclosure of Invention
Based on the background technology, the invention provides a strength-adjustable star polymer gel foam profile control agent and preparation and application thereof. The strength-adjustable star polymer gel foam profile control agent has the advantages of simple formula system operation, long stability time of foam under high temperature condition, good salt tolerance and capability of realizing the strength adjustment of gel foam.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a strength-adjustable star polymer gel foam profile control agent, which comprises the following components in percentage by mass: 0.1-0.3% of star polymer, 0.1-0.3% of stabilizer, 0.2-0.4% of cross-linking agent, 0.1-0.5% of foaming agent and the balance of water;
the star polymer is a water-soluble polymer which is composed of a star nucleus and a plurality of super polymer molecular chains and has strong salt resistance and temperature resistance.
Preferably, the star polymer is prepared by the following process: adopting an oxidation-reduction initiation system, carrying out water solution free radical copolymerization on two water-soluble monomers of 2-acrylamide-2-methylpropanesulfonic acid and acrylamide, and then carrying out cohydrolysis to prepare the compound; the relative molecular weight range is 1000-2500 ten thousand, and the hydrolysis degree range is 5-25%.
The preparation process in the preferred embodiment of the invention is as follows: adding 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), acrylamide monomer and sodium carbonate into deionized water, and uniformly stirring to prepare a solution with the required monomer concentration; then adding the trihydroxymethyl phenol, the azodiisobutyronitrile, the urea, the sodium formaldehyde sulfoxylate, the ethylene diamine tetraacetic acid and the span-20 into the system; putting the system into a constant-temperature water bath at 0 ℃, introducing nitrogen to remove oxygen for 25 minutes, adding ammonium persulfate and aqueous hydrogen peroxide, continuously introducing nitrogen for 5 minutes, and sealing the system; standing for reaction for 3 hours, heating the water bath to 95 ℃, continuing to react for 3 hours, and then taking out the rubber block; through pelletizing, stoving, crushing and sieving, white star polymer product with hydrolysis degree in 5-25 wt% and molecular weight of 1500-2500 ten thousand is obtained.
Preferably, when the mass percent of the star polymer is 0.1%, the star polymer is low-strength star polymer gel foam; when the mass percent of the star polymer is 0.2%, the star polymer is medium-strength star polymer gel foam; when the mass percent of the star polymer is 0.3%, the star polymer gel foam is high-strength.
Preferably, the stabilizer is a biopolysaccharide polymer.
Preferably, the crosslinker is a methylol phenol.
Preferably, the foaming agent is a biosurfactant alkyl glycoside (APG).
In the strength-adjustable star polymer gel foam profile control agent, all the added components are an organic whole, and gel foam cannot be formed when other components are replaced under the condition of the same temperature and mineralization degree. If the stabilizer biopolysaccharide polymer is only present, the star polymer is not capable of forming gel with the cross-linking agent hydroxymethyl phenol, and the strength-adjustable star polymer gel foam profile control agent cannot be prepared. Without the stabilizer biopolysaccharide polymer, the stability of the gel foam under high temperature, high salt conditions is poor. In the development process, other foaming agents than the foaming agent adopted by the invention are found to form gel foam basically, and the gel forming effect of the crosslinking agent is influenced. The cross-linking agent can not only meet the requirement that the gel forming time is realized within the half-life period of foam liquid separation, but also ensure the long-term stability of gel foam under the condition of the maximum foam volume, and other common cross-linking agents either do not form gel or break the gel quickly after gel formation and are unstable in dehydration. Preferably, the alkyl glycoside has a degree of polymerization of 1 to 2 and an alkyl carbon chain number of 6 to 14, preferably 8 to 14.
Preferably, the mass percentage of the alkyl glycoside in the strength-adjustable star polymer gel foam profile control agent is 0.3% -0.5%.
Preferably, the foam gas used in the strength-tunable star polymer gel foam profile control agent is nitrogen, carbon dioxide, reduced oxygen air, or air. More preferably, the foam gas used is nitrogen, reduced oxygen air or air.
The invention provides a preparation method of the strength-adjustable star polymer gel foam profile control agent, which comprises the following steps:
1) Adding water and a stabilizer into a reactor according to the mass percentage of each component;
2) Under the condition of continuous stirring, adding 0.1-0.3% of star polymer according to the requirement, and continuously stirring;
3) Sequentially adding a cross-linking agent and a foaming agent according to mass percent into the reactor under the condition of continuously stirring, and continuously stirring;
4) Placing the uniformly stirred system in an airflow foaming device or a stirring foaming device to obtain foam;
5) And placing the obtained foam in an oven at a specific temperature for a certain time to form the strength-adjustable star polymer gel foam profile control agent.
The star polymer gel foam profile control agent with adjustable strength adopts a mode of foaming firstly and then gelling, so that the star polymer gel foam profile control agent is convenient for later injection, and has larger foaming volume and longer stabilization time. Compared with the generally adopted mode of foaming before gelling, the mode of gelling is more difficult. With the foaming agent, the common crosslinking agent can not be gelled, and many foaming agents influence the formation of foam gel. The combination of foaming agent, cross-linking agent and stabilizer used in the invention can solve the problem, and the foaming agent, cross-linking agent and stabilizer are successfully foamed and then formed into gel.
Preferably, when the mass percent of the star polymer is added to be 0.1 percent, the low-strength star polymer gel foam is obtained; when the mass percent of the star polymer added is 0.2%, obtaining medium-strength star polymer gel foam; when the mass percent of star polymer added was 0.3%, a high strength star polymer gel foam was obtained.
The third aspect of the invention provides an application of the strength-adjustable star polymer gel foam profile control agent in tertiary oil recovery in petroleum exploitation.
Preferably, the reservoir temperature in tertiary oil recovery in oil development ranges from 20 ℃ to 90 ℃.
Preferably, the mineralization degree of the oil reservoir is less than 20000mg/L, and Ca is added 2+ 、Mg 2+ The degree of mineralization of the high valence ions is less than 1000mg/L.
The beneficial effects of the invention include:
the star polymer gel foam profile control agent with adjustable strength provided by the invention has the liquid half-lives of 3 days, 9 days and 12 days, the viscosities of 3000-10000 mPa.s, 10000-20000 mPa.s and 20000-40000 mPa.s (measured by a Brookfield viscometer under 1.5 RPM) under the conditions that the temperature is 20-90 ℃ and the mineralization degree is less than 20000mg/L for the low-strength, medium-strength and strong-strength star polymer gel foams, and the star polymer gel foams with appropriate strength can be selected according to the requirements of injection pressure and formation plugging strength. The gel foam system is simple in configuration, long in stability time under the condition of high temperature of foam, good in salt tolerance, capable of achieving adjustable strength of gel foam, and good in profile control and flooding effects on heterogeneous oil reservoirs and low-permeability fractured oil reservoirs.
Drawings
FIG. 1 is a graph of example 2 strength tunable star polymer gel foam morphology over time.
Fig. 2 is a dynamic pressure differential curve of homogeneous core plugging experiment in example 3.
FIG. 3 is a dynamic differential pressure curve of a fracture core plugging experiment in example 4.
FIG. 4 example 5 variation of the liquid-to-liquid ratio of the permeability step (5:1) with the injected amount.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
This example provides a method for preparing a star polymer for a strength tunable star polymer gel foam.
Weighing 5g of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), 21g of acrylamide monomer, a proper amount of sodium carbonate and a proper amount of deionized water until the total liquid amount is 100g, adding the weighed materials into a ground bottle, and uniformly stirring to prepare a solution with the required monomer concentration; then 0.005g of trihydroxymethyl phenol, 0.005g of azodiisobutyronitrile, 0.01g of urea, 0.005g of sodium formaldehyde sulfoxylate, 0.01g of disodium ethylene diamine tetraacetate and 0.01g of span-20 are added into a ground bottle; putting the ground bottle into a constant-temperature water bath at 0 ℃, introducing nitrogen to remove oxygen for 25 minutes, adding 0.005g of ammonium persulfate and 0.0005g of hydrogen peroxide aqueous solution, continuously introducing nitrogen for 5 minutes, and sealing the ground bottle by using a latex tube; standing for reaction for 3 hours, heating the water bath to 95 ℃, continuing to react for 3 hours, and then taking out the rubber block; through granulation, stoving, crushing and sieving, white powdered star polymer product with hydrolysis degree in 5-25% and molecular weight in 1500-2500 ten thousand is obtained.
Example 2
This example provides a method for preparing a strength tunable star polymer gel foam.
Preparing star polymer powder into 5000mg/L star polymer solution by using saline with the mineralization degree of 10000mg/L, standing for 24h and bottling for later use; weighing a proper amount of 5000mg/L star polymer solution, placing the star polymer solution in a device base liquid tank, sequentially adding a certain amount of stabilizer, cross-linking agent, foaming agent and saline with the mineralization degree of 10000mg/L into the device base liquid tank, uniformly stirring and mixing to prepare 1000mg/L, 2000mg/L and 3000mg/L base liquids with the total amount of 200g, opening an advection pump to set the flow rate, opening an air bottle and a gas flowmeter to start to prepare foam, collecting the prepared foam by using a measuring cylinder with a plug, and placing the foam in an oven at 80 ℃, wherein the experimental results are shown in Table 1.
As can be seen from Table 1, the stability and the viscosity after gelling of gel foam systems formed by star polymers of 1000mg/L, 2000mg/L and 3000mg/L can respectively show three strengths of low, medium and high, and the strength of the star polymer gel foam can be completely adjusted.
TABLE 1 Star Polymer gel foam composition and Properties for three strengths
Example 3
This example evaluates the stability performance of a strength tunable star polymer gel foam.
Preparing 1000mg/L, 2000mg/L and 3000mg/L star polymer solution by using 10000mg/L NaCl solution, preparing high, medium and low three-strength star polymer gel foam, sealing the star polymer gel foam in a measuring cylinder with a plug, placing the measuring cylinder in an oven at 80 ℃, and observing the form change of the gel foam within 180 days, wherein the change of the star polymer gel foams with different strengths along with time is shown in figure 1.
As is evident from FIG. 1, the low strength star polymer gel foam had reduced to less than 50% of the total foam volume at 60 days and completely destroyed at 180 days; the medium-strength star polymer gel foam still contains about 90 percent of the total foam amount at 90 days, but the foam is almost completely broken at 180 days; the total amount of the high-strength star polymer gel foam is still kept about 70 percent and is higher than 50 percent at 180 days, which indicates that the high-strength star polymer gel foam can stably exist within 180 days.
Example 4
In this example, the profile control and water shutoff performance of the strength-adjustable star polymer gel foam was evaluated.
The experiment simulates the conditions of the Wuliwan reservoir, the conventional physical simulation experiment for dynamic core blocking is adopted, the medium-strength star polymer gel foam is selected to block the high-permeability core, and the blocking effect is inspected. The star polymer gel foam system used in this example was a star polymer, a stabilizer, a crosslinking agent, and a blowing agent, which were present in amounts of 0.2%, 0.3%, 0.2%, and 0.4%, respectively. In this example, the core gas permeability was 1000mD, the star polymer gel foam carrier gas was nitrogen, the gas-liquid ratio was 3:1, the injection rate was 0.6mL/min, the core holder back pressure was 12.3MPa, and the ring pressure was 16MPa. And (3) driving by water at 80 ℃ until the injection pressure is stable, injecting 1PV star polymer gel foam, standing for 12 hours to form gel, and then driving by water to observe the plugging effect and the scouring resistance.
The injection pressure profile during the experiment is shown in figure 2. The subsequent water drive pressure is obviously increased after the star polymer gel foam is injected, and the subsequent water drive blocking rate reaches 99.92 percent, so that the star polymer gel foam has good profile control and water blocking performances.
Example 5
The homogeneous core was changed to a fracture core having a matrix permeability of 10mD and a fracture width of 0.6mm by the same method as described in example 4. The star polymer, stabilizer, crosslinker and blowing agent were present in the star polymer gel foam system used in this example at 0.1%, 0.2%, 0.4% and 0.5%, respectively.
The injection pressure profile during the experiment is shown in figure 3. In the early stage of water flooding, the injection pressure difference is extremely low, the injection pressure is still about 3-5kPa in the foam injection process, the water flooding is performed again after the star polymer gel foam is formed, the injection pressure difference rapidly rises, and the pressure difference tends to be stable and does not rise any more after the pressure difference reaches 1600 KPa. The star polymer gel foam system can play a good role in profile control of the low-permeability fracture core.
Example 6
The embodiment is evaluation of the profile control and flooding characteristics and the effect of improving the recovery ratio of the strength-adjustable star polymer gel foam on the heterogeneous stratum. The star polymer, stabilizer, crosslinking agent, and blowing agent were present in the star polymer gel foam system used in this example at 0.1%, 0.2%, 0.4%, and 0.5%, respectively.
Two cores of 100mD and 500mD are connected in parallel in the experiment, the experimental conditions are the same as those in example 3, and the experimental process is as follows: preparing a rock core, measuring permeability of single tube water, measuring saturated oil of single tube, driving water in parallel connection of double tubes, injecting a star polymer gel foam system after parallel connection, and driving water for the second time. The results of the experiment are shown in FIG. 4.
As can be seen from fig. 4, for a heterogeneous formation, the first water flood, the flow of fluid is predominantly plunging into the hypertonic section, which results in a strong water wash of the hypertonic core, with the crude oil being substantially in the residual oil state. And the low-permeability core has small swept volume, low displacement strength and higher residual oil saturation. And water flooding is performed again after the profile control of the star-shaped polymer foam gel, the star-shaped polymer foam gel can effectively plug a high permeability layer, and liquid flow redirection occurs, so that the liquid flow mainly enters a low permeability core, the core swept volume is greatly increased, and the heterogeneity of an oil reservoir is effectively improved.
Example 7:
this example illustrates a strength-tunable star polymer gel foam profile control agent in which all the additional components are an organic entity and the gel foam cannot be formed by replacing other components under the same conditions of temperature and mineralization.
Preparing star polymer powder into 5000mg/L star polymer solution by using saline with the mineralization degree of 10000mg/L, standing for 24h and bottling for later use; weighing a proper amount of 5000mg/L star polymer solution, placing the star polymer solution in a device base liquid tank (except for a test with a serial number of 11), then sequentially adding a certain amount of a stabilizer biological polysaccharide polymer (except for a test with a serial number of 12), different cross-linking agents (hydroxymethyl phenol, organic phenolic aldehyde or chromium chloride), different foaming agents (biosurfactant alkyl glycoside APG, sodium dodecyl sulfate SDS, cetyl trimethyl ammonium bromide CTAB, alpha-alkenyl sodium sulfonate AOS or fatty alcohol polyoxyethylene ether sodium sulfate AES) and saline with a mineralization degree of 10000mg/L into the device base liquid tank, stirring and mixing uniformly to prepare 3000mg/L base liquid with a total amount of 200g, opening a advection pump to set a flow rate, opening a gas cylinder and a gas flowmeter to start to prepare foam, collecting the prepared foam by using a measuring cylinder with a plug, and placing the foam in an oven at 80 ℃. The results of the experiment are shown in table 2.
TABLE 2 Strength-Adjustable Star Polymer gel foam Profile control agent Multi-factor Experimental results
As can be seen from table 2, the strength-tunable star polymer gel foam profile control agent after replacing the foaming agent biosurfactant alkyl glycoside APG with sodium dodecyl sulfate SDS, cetyltrimethylammonium bromide CTAB, sodium alpha-alkenyl sulfonate AOS and sodium fatty alcohol polyoxyethylene ether sulfate AES, despite the close foaming volume and the liquid half life, the gel foam could not be formed due to the mismatch of the replaced foaming agent with the star polymer, stabilizer biopolysaccharide polymer and cross-linking agent methylol phenol used (experiments No. 1, 2, 3 and 4). After the crosslinking agent hydroxymethyl phenol is replaced by the organic phenolic aldehyde system, the gelling speed of the organic phenolic aldehyde system is too low, the crosslinking time is far longer than the half-life period of foam, and gel foam can not be formed at all by adopting a mode of firstly foaming and then gelling to prepare the gel foam (experiments of serial numbers 5, 6 and 7). The strength-adjustable star polymer gel foam profile control agent can form gel with higher strength by adding chromium chloride cross-linking agents with different contents after the cross-linking agent hydroxymethyl phenol is replaced by chromium chloride, but the chromium ion cross-linked gel foam is extremely unstable at the temperature of 80 ℃ and is rapidly and intensely dehydrated (experiments No. 8, 9 and 10). The strength-adjustable star polymer gel foam profile control agent cannot form gel with crosslinking agent hydroxymethyl phenol without adding star polymer (experiment No. 11); if no stabilizing agent, namely biological polysaccharide polymer, is added, the stability of gel foam under the conditions of high temperature and high salt is poor, and the gel foam is easy to dehydrate and cannot meet the application requirement (experiment No. 12). All the added components of the strength-adjustable star polymer gel foam profile control agent are an organic whole, and stable gel foam meeting the application requirements cannot be formed by replacing other components under the same temperature and mineralization condition.
The above series of embodiments can illustrate that: the star polymer gel foam system disclosed by the invention is good in foam stability and strong in core plugging performance, and has a good profile control and flooding effect on low-permeability fractured reservoirs and heterogeneous reservoirs.
It should be understood that the above-described embodiments of the present invention are examples for clearly illustrating the invention, and are not to be construed as limiting the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and it is not intended to exhaust all embodiments, and obvious changes and modifications can be made on the basis of the technical solutions of the present invention.
Claims (11)
1. The strength-adjustable star polymer gel foam profile control agent is characterized by comprising the following components in percentage by mass: 0.1-0.3% of star polymer, 0.1-0.3% of biological polysaccharide polymer stabilizer, 0.2-0.4% of hydroxymethyl phenol cross-linking agent, 0.1-0.5% of biosurfactant alkyl glycoside foaming agent and the balance of water;
the star polymer is a water-soluble polymer which is composed of a star nucleus and a plurality of super polymer molecular chains and has strong salt resistance and temperature resistance; the star polymer is prepared by the following method: adopting an oxidation-reduction initiation system, carrying out water solution free radical copolymerization on two water-soluble monomers of 2-acrylamide-2-methylpropanesulfonic acid and acrylamide, and then carrying out cohydrolysis to prepare the compound; the relative molecular weight range is 1000-2500 ten thousand, and the hydrolysis degree range is 5-25%.
2. The strength tunable star polymer gel foam profile of claim 1, wherein 0.1% by mass of star polymer is a low strength star polymer gel foam; when the mass percent of the star polymer is 0.2%, the star polymer is medium-strength star polymer gel foam; when the mass percent of the star polymer is 0.3%, the star polymer gel foam is high-strength.
3. The strength tunable star polymer gel foam profile control agent of claim 1, wherein the biosurfactant alkyl glycoside foaming agent has a degree of polymerization of 1-2 and alkyl carbon chain number of 6-14.
4. The strength tunable star polymer gel foam profile control agent of claim 3, wherein the biosurfactant alkyl glycoside foaming agent is present in the strength tunable star polymer gel foam profile control agent in an amount of 0.3-0.5% by weight.
5. The strength tunable star polymer gel foam profile control agent of claim 1, wherein the foam gas used in the strength tunable star polymer gel foam profile control agent is nitrogen, carbon dioxide, reduced oxygen air, or air.
6. The strength tunable star polymer gel foam profile of claim 1, wherein the foam gas used in the strength tunable star polymer gel foam profile is nitrogen, reduced oxygen air, or air.
7. A process for preparing a strength tunable star polymer gel foam profile control agent according to any one of claims 1 to 6, comprising the steps of:
1) Adding water and a stabilizer into a reactor according to the mass percentage of each component;
2) Under the condition of continuous stirring, adding 0.1-0.3% of star polymer according to the requirement, and continuously stirring;
3) Sequentially adding a cross-linking agent and a foaming agent according to mass percent into the reactor under the condition of continuously stirring, and continuously stirring;
4) Placing the uniformly stirred system in an airflow foaming device or a stirring foaming device to obtain foam;
5) And placing the obtained foam in an oven at a specific temperature for a certain time to form the strength-adjustable star polymer gel foam profile control agent.
8. The production method according to claim 7, wherein when the mass percentage of the star polymer added is 0.1%, a low-strength star polymer gel foam is obtained; when the mass percent of the star polymer added is 0.2%, obtaining medium-strength star polymer gel foam; when the mass percent of star polymer added is 0.3%, a high-strength star polymer gel foam is obtained.
9. Use of the strength tunable star polymer gel foam profile control agent of any one of claims 1 to 6 in tertiary oil recovery in oil development.
10. Use according to claim 9, characterized in that the reservoir temperature in tertiary oil recovery in oil development ranges from 20 ℃ to 90 ℃.
11. The use of claim 10, wherein the reservoir has a mineralization of less than 20000mg/L, ca 2 + 、Mg 2+ The mineralization degree of the high valence ions is less than 1000mg/L.
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