CN111087988B - Polyacrylamide gel plugging agent and preparation method and application thereof - Google Patents
Polyacrylamide gel plugging agent and preparation method and application thereof Download PDFInfo
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- CN111087988B CN111087988B CN201811238465.5A CN201811238465A CN111087988B CN 111087988 B CN111087988 B CN 111087988B CN 201811238465 A CN201811238465 A CN 201811238465A CN 111087988 B CN111087988 B CN 111087988B
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- 229920002401 polyacrylamide Polymers 0.000 title claims abstract description 95
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000004202 carbamide Substances 0.000 claims abstract description 49
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002981 blocking agent Substances 0.000 claims abstract description 29
- 229920001807 Urea-formaldehyde Polymers 0.000 claims abstract description 25
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims abstract description 24
- -1 urea compound Chemical class 0.000 claims abstract description 22
- 125000001494 2-propynyl group Chemical group [H]C#CC([H])([H])* 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 125000001841 imino group Chemical group [H]N=* 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 239000011593 sulfur Substances 0.000 claims abstract description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 28
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 24
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 229920000642 polymer Polymers 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 14
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- 229940123973 Oxygen scavenger Drugs 0.000 claims description 13
- 229920001577 copolymer Polymers 0.000 claims description 13
- 239000000295 fuel oil Substances 0.000 claims description 13
- 230000007062 hydrolysis Effects 0.000 claims description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 6
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 5
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-araboascorbic acid Natural products OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 5
- 235000010350 erythorbic acid Nutrition 0.000 claims description 5
- 229940026239 isoascorbic acid Drugs 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 claims description 4
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- LJPYJRMMPVFEKR-UHFFFAOYSA-N prop-2-ynylurea Chemical compound NC(=O)NCC#C LJPYJRMMPVFEKR-UHFFFAOYSA-N 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- YCLDXRHGQVDVJR-UHFFFAOYSA-N carbamothioylurea Chemical compound NC(=O)NC(N)=S YCLDXRHGQVDVJR-UHFFFAOYSA-N 0.000 claims description 2
- OKGXJRGLYVRVNE-UHFFFAOYSA-N diaminomethylidenethiourea Chemical compound NC(N)=NC(N)=S OKGXJRGLYVRVNE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004318 erythorbic acid Substances 0.000 claims description 2
- 239000003349 gelling agent Substances 0.000 claims description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 claims description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 230000005465 channeling Effects 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 10
- 238000004132 cross linking Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000006482 condensation reaction Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 239000002904 solvent Substances 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 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/493—Additives for reducing or preventing gas migration
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to the technical field of oil exploitation, and provides a polyacrylamide gel blocking agent, and a preparation method and application thereof. The polyacrylamide gel plugging agent comprises: acrylamide polymer, water-soluble urea-formaldehyde resin, deoxidant, urea compound and water, wherein the urea compound has a structure shown in formula (1) and/or formula (2), R1And R2Each independently selected from hydrogen or 2-propynyl; r3、R4And R5Each independently selected from oxygen, sulfur or imino. The polyacrylamide gel plugging agent provided by the invention is simple in preparation method, can effectively plug a steam channeling channel for a long time (30-90 days) at a higher temperature (150-.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a polyacrylamide gel plugging agent and a preparation method and application thereof.
Background
Steam stimulation is the main mode of heavy oil development, is considered to be a conventional, economical and effective method and is widely used by heavy oil fields. Along with the progress of the multiple times of huff and puff stages, the water invasion and steam channeling are serious, the water content of the oil well is greatly increased, different degrees of influence are brought to the thermal recovery of the heavy oil reservoir, and the thermal recovery effect is deteriorated. The high water content of an oil well in the thermal recovery process of a heavy oil reservoir becomes a main problem influencing the thermal recovery effect. At present, one of the most effective methods for solving the problem is to use a gel plugging agent to block a steam channeling channel and improve the utilization degree and recovery ratio of thick oil.
The existing gel plugging agent is compounded and injected into a stratum by taking a polyacrylamide aqueous solution as a thickening agent and phenolic resin as a crosslinking agent, and is crosslinked in situ at the deep part of the stratum to form gel for plugging water. However, the technology is only suitable for the environment below 120 ℃, and cannot stably block water for a long time in a high-temperature steam huff and puff environment, because the system is unstable at high temperature, the working fluid enters the stratum and is excessively crosslinked in the early stage to be dehydrated, and the working fluid is thermally degraded in the later stage. Therefore, for the water shutoff operation of the steam huff and puff of the heavy oil reservoir, the construction success rate is not high, the oil increasing effective period is short, and the oil increasing effect is limited. The gel plugging agent which is effective for a long time at a higher temperature and in a longer time range is a current technical difficulty and needs to be broken through urgently.
Disclosure of Invention
Aiming at the problem that the existing gel blocking agent can not be effectively applied to higher temperature and realize longer-time water blocking, the invention aims to provide a novel polyacrylamide gel blocking agent, and a preparation method and application thereof. The polyacrylamide gel plugging agent can effectively plug a steam channeling channel in a higher temperature environment and a longer time range, and realizes the high-efficiency development of a heavy oil reservoir.
According to a first aspect of the present invention, there is provided a polyacrylamide-based gel blocking agent comprising: acrylamide polymer, water-soluble urea-formaldehyde resin, deoxidant, urea compound and water, wherein the urea compound has a structure shown in a formula (1) and/or a formula (2),
wherein R is1And R2Each independently selected from hydrogen or 2-propynyl, R3And R4Each independently selected from oxygen, sulfur or imino;
based on the total weight of the polyacrylamide gel plugging agent, the content of the urea compound is 0.1-2 wt%.
According to a second aspect of the present invention, the present invention provides a method for preparing the polyacrylamide gel blocking agent, the method comprising:
(1) dissolving an acrylamide polymer in water to obtain a polymer solution;
(2) and adding water-soluble urea-formaldehyde resin, a urea compound and an oxygen scavenger into the polymer solution, and stirring until the urea-formaldehyde resin, the urea compound and the oxygen scavenger are dissolved to obtain the polyacrylamide gel plugging agent.
According to a third aspect of the invention, the invention provides an application of the polyacrylamide gel plugging agent in heavy oil steam stimulation thermal recovery.
The polyacrylamide gel plugging agent provided by the invention is simple in preparation method, can effectively plug a steam channeling channel for a long time (30-90 days) at a higher temperature (150-. Compared with the existing gel plugging agent, the gel plugging agent has higher plugging rate and longer plugging time, and can be suitable for large pore path plugging operation in heavy oil steam huff and puff thermal recovery operation.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and these ranges or values should be understood to encompass values close to these ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
According to a first aspect of the present invention, there is provided a polyacrylamide-based gel blocking agent comprising: acrylamide polymer, water-soluble urea-formaldehyde resin, deoxidant, urea compound and water.
In the present invention, the urea compound has a structure represented by formula (1) and/or formula (2),
wherein R is1And R2Each independently selected from hydrogen or 2-propynyl, R3And R4Each independently selected from oxygen, sulfur or imino.
Preferably, the urea compound is one or more of urea, 2-propynyl urea, biuret, thiobiuret and 2-imino-4-thiobiuret.
More preferably, the urea-based compound is urea. Urea has a smaller molecular weight and volume relative to its dimer (e.g., biuret) and its substituted compounds (e.g., 2-propynyl urea), has less steric hindrance and better mobility when reacted in the gellant system, and is somewhat better able to compete with polyacrylamide-based polymers during condensation reactions with water-soluble urea-formaldehyde resins.
In the present invention, the content of the urea compound is 0.1 to 2% by weight, preferably 0.2 to 1% by weight, based on the total weight of the polyacrylamide-based gel blocking agent.
In the present invention, the kind and amount of the acrylamide-based polymer may be selected with reference to the prior art, and the acrylamide-based polymer may be synthesized according to the prior art or commercially available. For the present invention, preferably, the acrylamide-based polymer is one or more of partially hydrolyzed polyacrylamide, partially hydrolyzed methylene polyacrylamide, acrylamide/acrylic acid/AMPS sodium salt copolymer, and acrylamide/acrylic acid/acrylonitrile sodium salt copolymer. Wherein the partially hydrolyzed polyacrylamide and the acrylamide/acrylic acid/AMPS sodium salt copolymer are available from Shandong Baumo et al.
Preferably, the viscosity average molecular weight of the acrylamide polymer is 800 to 3500 ten thousand, more preferably 1000 to 3000 ten thousand; the degree of hydrolysis of the acrylamide-based polymer is 8 to 35%, and more preferably 10 to 25%, respectively.
In the present invention, the degree of hydrolysis is measured by the method for measuring the degree of hydrolysis of partially hydrolyzed polyacrylamide according to the national standard GB/T12005.6-1989.
Preferably, the acrylamide-based polymer is contained in an amount of 0.1 to 2% by weight, more preferably 0.2 to 1% by weight, based on the total weight of the polyacrylamide-based gel blocking agent.
In the invention, the water-soluble urea-formaldehyde resin is linear urea-formaldehyde resin, and is preferably obtained by polymerizing formaldehyde/urea monomer with a molar ratio of 1-3 under an alkaline condition. Typically, the water-soluble urea-formaldehyde resin is a solid-liquid mixture having a pH greater than 9 and a solids content greater than 40% by weight.
Preferably, the water-soluble urea-formaldehyde resin is contained in an amount of 0.1 to 2 wt%, more preferably 0.2 to 1 wt%, based on the total weight of the polyacrylamide gel blocking agent.
In the invention, the oxygen scavenger can reduce the oxidative degradation of the polymer in the system, and the type and the dosage of the oxygen scavenger can be selected according to the prior art. In the present invention, preferably, the oxygen scavenger is one or more of sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium hydrosulfite and erythorbic acid.
Preferably, the oxygen scavenger accounts for 0.05-1 wt% of the total weight of the polyacrylamide gel plugging agent.
In the present invention, water is used as a solvent and a reaction medium in the polyacrylamide gel blocking agent system, and the selection of the solvent and the reaction medium is not particularly limited in the present invention. The degree of mineralization of water is usually less than 500 mg, and can be natural water, such as rivers, lakes, atmospheric water, seawater, groundwater and the like, and artificial water, such as tap water, distilled water, deionized water or heavy water. In the present invention, the water content is 93 to 99.65% by weight, preferably 96 to 99.35% by weight, based on the total weight of the polyacrylamide-based gel blocking agent.
In the invention, the content of each component in the polyacrylamide gel plugging agent is calculated by the feeding amount.
The polyacrylamide gel plugging agent is suitable for plugging a steam channeling pipeline in the process of steam huff-puff thermal recovery of thick oil. Specifically, hydroxyl in the water-soluble urea-formaldehyde resin and an amide group of the acrylamide polymer can undergo an in-situ dehydration condensation reaction at high temperature, so that the acrylamide polymer is crosslinked, the system gradually forms gel along with the reaction, and a steam channeling pipeline is blocked in the process of steam huff-puff thermal recovery of thick oil. In addition to the above reaction, the urea compound contained in the system can also undergo a dehydration condensation reaction with the water-soluble urea resin, and the possible reaction mechanism is as follows (taking the urea compound represented by formula (1) as an example):
therefore, the condensation reaction of the urea compound, the acrylamide polymer and the water-soluble urea-formaldehyde resin forms competition, so that the crosslinking speed of the acrylamide polymer is reduced, the crosslinking reaction of the acrylamide polymer can be continuously carried out for a long time, and the polyacrylamide gel plugging agent provided by the invention is tested to be gelled one day at 150 ℃ to form plugging.
In addition, the addition of the urea compound reduces the density of crosslinking active points in the system, inhibits the dehydration phenomenon caused by excessive crosslinking of the acrylamide polymer, can adjust the distance between the crosslinking active points, slows down the degree of covering the crosslinking active points, improves the crosslinking efficiency, increases the strength of gel formed by the crosslinking system, and ensures that the formed gel system can be kept stable at a higher temperature.
According to a second aspect of the present invention, there is provided a method for preparing the polyacrylamide-based gel blocking agent according to the first aspect of the present invention, the method comprising:
(1) dissolving an acrylamide polymer in water to obtain a polymer aqueous solution;
(2) and adding water-soluble urea-formaldehyde resin, a urea compound and an oxygen scavenger into the polymer aqueous solution, and stirring until the urea-formaldehyde resin, the urea compound and the oxygen scavenger are completely dissolved to obtain the polyacrylamide gel plugging agent.
According to a third aspect of the invention, the invention provides the application of the polyacrylamide gel plugging agent in heavy oil steam stimulation thermal recovery. As mentioned above, the polyacrylamide gel plugging agent is particularly suitable for plugging a steam channeling pipeline in the process of steam huff and puff thermal recovery of heavy oil.
According to the invention, the application may comprise: and injecting the polyacrylamide gel plugging agent into the stratum, so that the polyacrylamide gel plugging agent is crosslinked in situ in the stratum to form gel.
Under the environment of steam huff and puff thermal recovery of thickened oil, the gel plugging agent formed by the polyacrylamide gel plugging agent can be kept for 30-90 days at the temperature of 150-180 ℃.
The present invention will be described in detail below by way of examples.
Example 1
This example is intended to illustrate the polyacrylamide gel blocking agent of the present invention and the process for producing the same.
At room temperature, 20 g of partially hydrolyzed polyacrylamide (viscosity average molecular weight 800 ten thousand, degree of hydrolysis 8%) is dissolved in 1L of water, and the mixture is stirred at 500 rpm until the partially hydrolyzed polyacrylamide is completely dissolved; and then sequentially adding 20 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8), 10 g of urea and 10 g of sodium thiosulfate, and stirring until the urea, the urea and the sodium thiosulfate are completely dissolved to obtain the polyacrylamide gel blocking agent.
The plugging performance of the polyacrylamide gel plugging agent at 150 ℃ for 60 days of standing time was tested, and the results are shown in table 1.
The Darcy principle is applied to the test of the plugging performance, and the prior art can be specifically referred to. The method for testing the plugging performance comprises the following steps:
filling a simulated core (the diameter d of the core is 25mm, the length L of the core is 200mm), injecting water into the core at the flow rate of 2 ml/min after vacuumizing, and measuring the permeability (k) before core plugging0) (ii) a Then injecting the mixture into the core model1.0-1.5PV the polyacrylamide gel plugging agent of the embodiment is prepared by plugging two ends of a rock core by using a plug, placing the rock core in a constant temperature oven of 150 ℃ for standing for 60 days, injecting water again until the pressure is stable, recording the reading on a pressure gauge to obtain the injection pressure difference, and calculating the permeability (k') after the rock core is plugged, thereby calculating the plugging rate;
for convenience of description and explanation, k will be given0And k' are collectively called as core permeability k, and the calculation formula is as follows:
wherein Q is the injection rate, mL · s-1(ii) a μ is the fluid viscosity, mPa · s; a is the cross section area of the sand-filled model in cm2，A＝πd2(ii)/4; Δ P is the injection pressure difference, 10-1MPa；k，μm2。
In addition, the plugging rate (eta) is taken as a parameter for representing the plugging performance of the plugging agent, and the calculation formula is as follows:
example 2
This example is intended to illustrate the polyacrylamide gel blocking agent of the present invention and the process for producing the same.
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight 2000 ten thousand, hydrolysis degree 22%) is dissolved in 1L of water, and the mixture is stirred at the speed of 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; 4 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8), 2 g of urea and 2 g of isoascorbic acid are added in sequence and stirred until all the components are dissolved, so as to obtain the polyacrylamide gel plugging agent of the embodiment.
The plugging rate of the polyacrylamide gel plugging agent is tested under the conditions of 150 ℃/60 days, 150 ℃/75 days, 150 ℃/90 days, 165 ℃/60 days and 180 ℃/60 days, the testing method is the same as that of example 1, and the testing results are shown in tables 1 and 2.
Example 3
This example is intended to illustrate the polyacrylamide gel blocking agent of the present invention and the process for producing the same.
At room temperature, 1 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight is 3500 ten thousand, hydrolysis degree is 35%) is dissolved in 1L of water, and the mixture is stirred at 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; then, 1 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8), 1.5 g of urea and 0.5 g of sodium bisulfite are added in sequence and stirred until the mixture is completely dissolved, so as to obtain the polyacrylamide gel plugging agent.
The plugging rate of the polyacrylamide gel plugging agent at the temperature of 150 ℃ for 60 days after standing is tested, the test method is the same as that of example 1, and the test results are shown in table 1.
Example 4
This example is intended to illustrate the polyacrylamide gel blocking agent of the present invention and the process for producing the same.
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight 2000 ten thousand, hydrolysis degree 22%) is dissolved in 1L of water, and the mixture is stirred at 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; then, 4 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8), 5 g of biuret and 2 g of isoascorbic acid are added in sequence and stirred until all the components are dissolved, so as to obtain the polyacrylamide gel plugging agent.
The plugging rate of the polyacrylamide gel plugging agent at the temperature of 150 ℃ for 60 days after standing is tested, the test method is the same as that of example 1, and the test results are shown in table 1.
Example 5
This example is intended to illustrate the polyacrylamide gel blocking agent of the present invention and the process for producing the same.
At room temperature, 20 g of partially hydrolyzed polyacrylamide (viscosity average molecular weight 800 ten thousand, degree of hydrolysis 8%) is dissolved in 1L of water, and the mixture is stirred at 500 rpm until the partially hydrolyzed polyacrylamide is completely dissolved; and then sequentially adding 20 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8), 20 g of urea and 10 g of sodium thiosulfate, and stirring until the urea, the urea and the sodium thiosulfate are completely dissolved to obtain the polyacrylamide gel plugging agent.
The plugging rate of the polyacrylamide gel plugging agent at the temperature of 150 ℃ for 60 days after standing is tested, the test method is the same as that of example 1, and the test results are shown in table 1.
Comparative example 1
At room temperature, 4 g of acrylamide/acrylic acid/AMPS sodium salt copolymer (viscosity average molecular weight 2000 ten thousand, hydrolysis degree 22%) is dissolved in 1L of water, and the mixture is stirred at a speed of 500 revolutions per minute until the acrylamide/acrylic acid/AMPS sodium salt copolymer is completely dissolved; 5 g of water-soluble urea-formaldehyde resin (the molar ratio of formaldehyde to urea is 2.8) and 2 g of isoascorbic acid are added in sequence and stirred until the mixture is completely dissolved, so as to obtain the polyacrylamide gel plugging agent of the comparative example.
The plugging rate of the polyacrylamide gel plugging agent at the temperature of 150 ℃ for 60 days after standing is tested, the test method is the same as that of example 1, and the test results are shown in table 1.
And (3) a plugging rate test result:
TABLE 1
Note: table 1 shows the results of the test of the plugging rate (150 ℃ C./60 days) of examples and comparative examples.
TABLE 2
Note: table 2 shows the results of the plugging rate tests of example 2 under different test conditions.
As can be seen from Table 1, the polyacrylamide gel blocking agents of examples 1 to 5 have higher blocking rates than those of the urea compound-free gel blocking agent of comparative example 1 under the condition of standing at 150 ℃ for 60 days. As can be seen from Table 2, the polyacrylamide gel plugging agent can stably exist for at least 90 days at the temperature of 150 ℃, and a higher plugging rate is kept; can be stably stored for at least 60 days when the temperature is increased to 180 ℃. Therefore, the polyacrylamide gel plugging agent is applied to heavy oil steam huff-puff thermal recovery, can effectively plug a steam channeling passage at a high temperature (150-180 ℃) for a long time (60-90 days), can greatly improve the success rate of water plugging operation, and realizes the high-efficiency development of heavy oil reservoirs.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A polyacrylamide gel blocking agent, characterized in that the polyacrylamide gel blocking agent comprises: the urea-based composite material comprises an acrylamide polymer, water-soluble urea-formaldehyde resin, an oxygen scavenger, a urea-based compound and water, wherein the urea-based compound has a structure shown in a formula (1) and/or a formula (2),
wherein R is1And R2Each independently selected from hydrogen or 2-propynyl, R3And R4Each independently selected from oxygen, sulfur or imino;
based on the total weight of the polyacrylamide gel plugging agent, the content of the urea compound is 0.1-2 wt%, the content of the acrylamide polymer is 0.1-2 wt%, the content of the water-soluble urea-formaldehyde resin is 0.1-2 wt%, and the content of the oxygen scavenger is 0.05-1 wt%;
the water-soluble urea-formaldehyde resin is prepared from formaldehyde and urea according to the weight ratio of 1-3: 1, is polymerized.
2. The polyacrylamide-based gel blocking agent according to claim 1, wherein the urea-based compound is contained in an amount of 0.2 to 1% by weight based on the total weight of the polyacrylamide-based gel blocking agent.
3. The polyacrylamide-based gelling agent according to claim 1 or 2, wherein the urea-based compound is one or more of urea, 2-propynyl urea, biuret, thiobiuret and 2-imino-4-thiobiuret.
4. The polyacrylamide gel blocking agent according to claim 3, wherein the urea compound is urea.
5. The polyacrylamide-based gel blocking agent according to claim 1, wherein the acrylamide-based polymer is one or more of partially hydrolyzed polyacrylamide, partially hydrolyzed methylene polyacrylamide, acrylamide/acrylic acid/AMPS sodium salt copolymer, and acrylamide/acrylic acid/acrylonitrile sodium salt copolymer.
6. The polyacrylamide gel blocking agent according to claim 5, wherein the viscosity average molecular weight of the acrylamide polymer is 800-3500 ten thousand, and the degree of hydrolysis is 8-35%.
7. The polyacrylamide-based gel plug of claim 1, wherein the oxygen scavenger is one or more of sodium thiosulfate, sodium sulfite, sodium bisulfite, sodium hydrosulfite, and erythorbic acid.
8. A method for preparing the polyacrylamide gel blocking agent of any one of claims 1 to 7, wherein the method comprises:
(1) dissolving the acrylamide polymer in water to obtain a polymer solution;
(2) and adding water-soluble urea-formaldehyde resin, a urea compound and an oxygen scavenger into the polymer solution, and stirring until the urea-formaldehyde resin, the urea compound and the oxygen scavenger are dissolved to obtain the polyacrylamide gel plugging agent.
9. Use of the polyacrylamide gel blocking agent of any one of claims 1-7 in heavy oil steam stimulation thermal recovery.
10. The application of claim 9, wherein the application comprises: and injecting the polyacrylamide gel plugging agent into the stratum, so that the polyacrylamide gel plugging agent is crosslinked in situ in the stratum to form gel.
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| CN107794014A (en) * | 2017-10-25 | 2018-03-13 | 中国石油化工股份有限公司 | Middle low temperature gel adjusts stifled system and preparation method thereof |
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| CN107794014A (en) * | 2017-10-25 | 2018-03-13 | 中国石油化工股份有限公司 | Middle low temperature gel adjusts stifled system and preparation method thereof |
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