CN107502325B - Preparation method and application of high-temperature-resistant high-salt profile control and flooding agent - Google Patents
Preparation method and application of high-temperature-resistant high-salt profile control and flooding agent Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 118
- 150000003839 salts Chemical class 0.000 claims abstract description 61
- 229920000642 polymer Polymers 0.000 claims abstract description 54
- 239000003381 stabilizer Substances 0.000 claims abstract description 19
- 239000008398 formation water Substances 0.000 claims abstract description 18
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 17
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 16
- SMQUZDBALVYZAC-UHFFFAOYSA-N salicylaldehyde Chemical group OC1=CC=CC=C1C=O SMQUZDBALVYZAC-UHFFFAOYSA-N 0.000 claims description 16
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- JRUSUOGPILMFBM-UHFFFAOYSA-N n,n-dioctylprop-2-enamide Chemical compound CCCCCCCCN(C(=O)C=C)CCCCCCCC JRUSUOGPILMFBM-UHFFFAOYSA-N 0.000 claims description 9
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 8
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- 230000033558 biomineral tissue development Effects 0.000 claims description 8
- 229940047670 sodium acrylate Drugs 0.000 claims description 8
- 235000010265 sodium sulphite Nutrition 0.000 claims description 8
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 8
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 8
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 239000007832 Na2SO4 Substances 0.000 claims description 6
- 238000007334 copolymerization reaction Methods 0.000 claims description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000006004 Quartz sand Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 238000011049 filling Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 238000004090 dissolution Methods 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 239000012267 brine Substances 0.000 description 4
- 229920000891 common polymer Polymers 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 239000012760 heat stabilizer Substances 0.000 description 4
- 238000011835 investigation Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000009991 scouring Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- 238000013112 stability test Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- RGHHSNMVTDWUBI-UHFFFAOYSA-N 4-hydroxybenzaldehyde Chemical compound OC1=CC=C(C=O)C=C1 RGHHSNMVTDWUBI-UHFFFAOYSA-N 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- -1 preferably 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
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
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- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides a preparation method and application of a high-temperature-resistant high-salt profile control and flooding agent. The high-temperature-resistant high-salinity profile control agent comprises, by weight, 100 parts of a high-temperature-resistant high-salinity profile control agent, 0.5-0.6 part of a temperature-resistant salt-resistant polymer, 0.4-0.6 part of a cross-linking agent, 0.3-0.5 part of a stabilizer and the balance of high-salinity formation water. The high-temperature-resistant high-salt profile control agent provided by the invention can be suitable for deep liquid flow profile control of a high-water-content oil field, and can resist hypersalinity of 5.0 multiplied by 104mg/L‑15×104The gelling time of the oil reservoir of mg/L is controllable from 8h to 24h, the gelling viscosity is high, and the apparent viscosity of the gel reaches 1.0 multiplied by 10 under the condition of 120 DEG C4mPa.s‑2.5×104And mPa.s, the gel viscosity retention rate of the high-salinity oil deposit is more than 80% through continuous 3-month thermal stability inspection, deep liquid flow steering can be realized, a high permeable layer can be effectively blocked, and the purpose of blocking the high permeable layer of the high-salinity oil deposit is achieved.
Description
Technical Field
The invention belongs to the technical field of oil reservoir exploitation, and relates to a preparation method and application of a high-temperature-resistant high-salinity profile control agent.
Background
The injected water single layer burst caused by the long-term water injection of the water drive development oil reservoir, the interlayer contradiction and the interlayer interference are very serious. The profile control and water shutoff technology is an important means for solving the problem of inefficient water injection circulation in water drive development of oil fields and improving the water injection efficiency and the final recovery ratio. The deep fluid flow diversion profile control agent is one of important components in profile control and water shutoff technology, but the deep fluid flow diversion profile control agent applied on site at present cannot resist high temperature and high salt, the formed gel has low viscosity, short validity period and poor plugging effect, and cannot meet the requirements of profile control and water shutoff development of high-temperature and high-salt oil reservoirs. In view of the technical problems of the deep liquid flow diversion profile control and flooding agent, a great deal of research work on high-temperature-resistant high-salt profile control and flooding agents is carried out.
The enhanced recovery ratio becomes the key direction of attack and defense for the development of the high-water-content old oil field. The organogel profile control agent plays an extremely important role in oil stabilization and water control of old oil fields, but the problem is how to improve the recovery efficiency under severe oil reservoir conditions such as high temperature and high salinity. For high-temperature and high-salt oil reservoirs, the general polymer has poor temperature resistance and salt resistance, and the expression is that the apparent viscosity of a polymer solution is low, the thermal stability is poor, the effective period of gel is short, and the profile control effect after measures is poor.
Disclosure of Invention
The invention aims to solve the problems of thermal stability, plugging effect and the like of a profile control agent under severe oil reservoir conditions such as high temperature and high salt of a high-water-content oil field, and provides a preparation method and application of a high-temperature-resistant and high-salt-resistant profile control agent suitable for the high-water-content oil field. The profile control agent has temperature resistance, salt resistance and long-term thermal stability, and can meet the requirements of profile control of high-temperature and high-salt oil reservoirs.
The purpose of the invention is realized by the following technical scheme:
the invention provides a high-temperature-resistant high-salt profile control and flooding agent, which comprises the following raw material components in parts by weight of 100 parts:
0.5-0.6 part of temperature-resistant and salt-resistant polymer
0.4 to 0.6 portion of cross-linking agent
0.3 to 0.5 portion of stabilizer
And the balance of hypersalinity formation water.
In the above-mentioned high-temperature-resistant and high-salt-resistant profile control agent, preferably, the temperature-resistant and salt-resistant polymer may include a copolymer formed by copolymerizing two or more of acrylamide, sodium acrylate, sodium styrene sulfonate, N-dioctyl acrylamide and the like.
In the above high-temperature-resistant high-salt profile control agent, preferably, the temperature-resistant salt-resistant polymer is acrylamide, sodium acrylate, sodium styrene sulfonate and N, N-dioctyl acrylamide, and the mass ratio of the four raw materials is (19-20): (2-3): (2-5): (0.02-0.05) by copolymerization.
In the high-temperature-resistant high-salt profile control agent, four raw materials of acrylamide, sodium acrylate, sodium styrene sulfonate and N, N-dioctyl acrylamide are preferably adopted for copolymerization, wherein a hydrophobic monomer N, N-dioctyl acrylamide is added for copolymerization, and the N, N-dioctyl acrylamide has two octyl substituents, so that on one hand, the steric hindrance is increased, and the curling degree of a polymer chain under the condition of high mineralization is weakened; and the other surface inhibits the hydrolysis of the amide group under the high-temperature condition to a certain extent, improves the thermal stability of the gel under the high-temperature and high-salinity conditions, and leads the viscosity of the synthesized temperature-resistant and salt-resistant polymer solution and the initial viscosity of the formed gel to be obviously increased under the mutual synergistic action.
In the above high-temperature-resistant and high-salt-resistant modifying and flooding agent, preferably, the copolymerization method of the temperature-resistant and salt-resistant polymer is as follows:
mixing the raw materials for preparing the temperature-resistant and salt-resistant polymer at the temperature of 10-15 ℃, adding water to obtain a mixed solution, introducing nitrogen into the mixed solution for 10-15min, then adding tetramethylethylenediamine, ammonium persulfate and sodium sulfite, continuing introducing nitrogen for 3-5min, then granulating, drying and screening by a mesh screen to obtain the temperature-resistant and salt-resistant polymer;
wherein, every 100 weight parts of mixed solution comprises 0.1 to 0.2 part of tetramethylethylenediamine, 0.05 to 0.1 part of ammonium persulfate, 0.025 to 0.05 part of sodium sulfite, 24.02 to 27.05 parts of raw materials of temperature-resistant and salt-resistant polymer and the balance of water.
In the high-temperature-resistant high-salt profile control agent, preferably, 20-mesh and 60-mesh screens are adopted for mesh screening in sequence, and the polymer which cannot be filtered out by the 60-mesh screens is the temperature-resistant salt-resistant polymer.
In the high-temperature and high-salt resistant profile control agent, the cross-linking agent can preferably comprise one or more of phenolic resin, p-hydroxybenzaldehyde, salicylaldehyde and the like.
In the above high-temperature and high-salt resistant profile control agent, preferably, the cross-linking agent is salicylaldehyde. The cross-linking agent is preferably salicylaldehyde which has a benzene ring structure, and the thermal stability of the formed gel is greatly improved.
In the high-temperature and high-salt resistant profile control agent, the stabilizer can preferably comprise one or more of bisphenol A, sodium thiosulfate, sodium polyphosphate and the like. The viscosity of the polymer solution is greatly influenced by the existence of divalent ions, so that the addition of sodium polyphosphate can complex part of divalent calcium and magnesium ions in formation water, and the viscosity of the modifying and flooding agent is improved.
In the above high-temperature-resistant high-salt profile control agent, preferably, the stabilizer is sodium thiosulfate and sodium polyphosphate in a mass ratio of 1: (0.3-0.5) compound mixture.
In the high-temperature-resistant high-salt profile control agent, the high-salinity formation water preferably comprises 10% of NaCl and 1% of CaCl based on 100% of the weight of the high-salinity formation water21% MgCl20.6% of Na2SO4And the formation water mineralization composition is a water sample test result obtained from an oil field on site, and can effectively meet the oil reservoir use condition. The dissolution time of the temperature-resistant salt-resistant polymer in the hypersalinity formation water<120min, the requirements of site construction can be met, and the prepared high-temperature-resistant high-salt profile control agent has better high-salt resistance.
The invention also provides a preparation method of the high-temperature-resistant high-salt profile control and flooding agent, which comprises the following steps:
adding a temperature-resistant salt-resistant polymer, a cross-linking agent and a stabilizing agent into the hypersalinity water, and mixing and stirring uniformly to obtain the high-temperature-resistant high-salt profile control agent.
The invention also provides the high-temperature-resistant high-salt profile control and flooding agent with the mineralization degree of 5.0 multiplied by 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
The high-temperature-resistant high-salt profile control agent provided by the invention can be suitable for deep liquid flow profile control of a high-water-content oil field, and can resist hypersalinity of 5.0 multiplied by 104mg/L-15×104The gelling time of the oil deposit of mg/L is controllable from 8h to 24h, the gelling viscosity is high, and the gel surface is at 120 DEG CApparent viscosity reaches 1.0 multiplied by 104mPa.s-2.5×104And mPa.s, the gel viscosity retention rate of the high-salinity oil deposit is more than 80% through continuous 3-month thermal stability inspection, deep liquid flow steering can be realized, a high permeable layer can be effectively blocked, and the purpose of blocking the high permeable layer of the high-salinity oil deposit is achieved.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The instrument for measuring the gel viscosity in the examples is a Brookfield DV-III rotational viscometer, spindle 64, shear rate 7.34s-1。
Example 1
The embodiment provides a high temperature and high salt resistant profile control agent suitable for a high water content oil field, and the raw material components of the high temperature and high salt resistant profile control agent comprise:
the hypersalinity formation water comprises 10% of NaCl and 1% of CaCl based on the weight of the hypersalinity formation water as 100%21% MgCl20.6% of Na2SO4And the balance deionized water.
The preparation method of the high temperature resistant and salt resistant polymer in the embodiment comprises the following steps: 75.805 parts by weight of deionized water, 20 parts by weight of acrylamide, 2 parts by weight of sodium acrylate, 2 parts by weight of sodium styrene sulfonate and 0.02 part by weight of N, N-dioctylacrylamide are sequentially added into a jar with a stopper at the temperature of 12 ℃, nitrogen is introduced for 15min, then 0.05 part by weight of ammonium persulfate, 0.025 part by weight of sodium sulfite and 0.1 part by weight of tetramethylethylenediamine are added, nitrogen is continuously introduced for 5min and then the jar is sealed, granulation and drying are carried out after the polymerization reaction is finished, screening treatment is carried out on the mixture by respectively sieving with 20-mesh and 60-mesh sieves, and the polymer which can not be filtered out by the 60-mesh sieves is the temperature-resistant and salt-resistant polymer of the embodiment.
The temperature and salt resistant polymer was tested for solubility by charging with 100g of hypersaline brine (10% wtNaCl + 1% wtCaCl)2+1％wtMgCl2+0.6％wtNa2SO4) 0.5g of the temperature-resistant and salt-resistant polymer is added into the beaker, and after stirring, the temperature-resistant and salt-resistant polymer solution is found to be uniform and stable without fine particles, and the time for complete dissolution is 90 min.
The implementation also provides a preparation method of the high-temperature-resistant high-salt profile control and flooding agent, according to the using amount of the raw material components of the high-temperature-resistant high-salt profile control and flooding agent, high-salinity saline water, a temperature-resistant salt-resistant polymer, salicylaldehyde and a stabilizer are sequentially added into a beaker, and the mixture is uniformly mixed to obtain the high-temperature-resistant high-salt profile control and flooding agent.
The high-temperature-resistant high-salt profile control and flooding agent prepared by the implementation is subjected to a thermal stability test: the high-temperature-resistant high-salt profile control agent is filled into a plurality of 60mL stainless steel aging tanks and is placed in a drying box with the adjusted temperature (120 ℃), a sample is taken out at intervals, and the apparent viscosity of the gel is observed to evaluate the thermal stability of the gel.
Experiments show that after 24 hours, the high-temperature-resistant high-salt profile control agent of the embodiment is initially gelled, the measured apparent viscosity is 12000mPa & s, the thermal stability performance is continuously examined for 3 months, and the experimental results are shown in Table 1.
TABLE 1 thermal stability of profile control agents
Note: the common organogel profile control and flooding agent is prepared by mixing the common polymer, the cross-linking agent and the heat stabilizer with the mass fractions of the high-temperature-resistant high-salt profile control and flooding agent and the like in the embodiment. Wherein the stabilizer is sodium thiosulfate and sodium polyphosphate, and the ratio of the stabilizer to the sodium polyphosphate is 1: 0.5.
from the experimental results in table 1, it can be seen that, through the continuous 3-month thermal stability investigation, the viscosity retention rates of the high-temperature-resistant high-salt modifying and flooding agent of the embodiment are respectively as follows: 81.5% and 45.2%, it can be seen that the high temperature and high salt resistant profile control agent of the present embodiment exhibits better thermal stability.
The embodiment also provides the high-temperature-resistant high-salt profile control and flooding agent with the mineralization degree of 5.0 multiplied by 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
Filling quartz sand of 40-60 meshes into a sand filling pipe with the diameter of 2.5cm and the length of 60cm, respectively injecting the high-temperature-resistant high-salt profile control and flooding agent and a common organic gel profile control and flooding agent into a core pipe filled with the quartz sand with the same particle size, sealing two ends of the core pipe, placing the core pipe in a 120 ℃ constant-temperature drying box for keeping constant temperature for 72 hours to gelatinize the core pipe, then injecting water for a displacement experiment, and further investigating the scouring-resistant plugging capability of the profile control and flooding agent, wherein the plugging rates of the high-temperature-resistant high-salt profile control and flooding agent and the organic gel profile control and flooding agent are respectively 86.9% and 75.8%, and the plugging rate of the high-temperature-resistant high-salt profile control and flooding agent is improved by 11.1% compared with the common organic gel profile control.
Example 2
The embodiment provides a high temperature and high salt resistant profile control agent suitable for a high water content oil field, and the raw material components of the high temperature and high salt resistant profile control agent comprise:
the hypersalinity formation water comprises 10% of NaCl and 1% of CaCl based on the weight of the hypersalinity formation water as 100%21% MgCl20.6% of Na2SO4And the balance deionized water.
The preparation method of the high temperature resistant and salt resistant polymer in the embodiment comprises the following steps: at the temperature of 12 ℃, 74.7 parts by weight of deionized water, 19 parts by weight of acrylamide, 3 parts by weight of sodium acrylate, 3 parts by weight of sodium styrene sulfonate and 0.04 part by weight of N, N-dioctylacrylamide are sequentially added into a jar with a stopper, nitrogen is introduced for 15min, then 0.07 part by weight of ammonium persulfate, 0.04 part by weight of sodium sulfite and 0.15 part by weight of tetramethylethylenediamine are added, nitrogen is continuously introduced for 5min and then sealed, granulation and drying are carried out after the polymerization reaction is finished, screening treatment is carried out on the mixture by respectively sieving with 20-mesh and 60-mesh sieves, and the polymer which cannot be filtered out by the 60-mesh sieves is the temperature-resistant and salt-resistant polymer of the embodiment.
The temperature and salt resistant polymer was tested for solubility by charging with 100g of hypersaline brine (10% wtNaCl + 1% wtCaCl)2+1％wtMgCl2+0.6％wtNa2SO4) 0.5g of the temperature-resistant and salt-resistant polymer is added into the beaker, and after stirring, the temperature-resistant and salt-resistant polymer solution is found to be uniform and stable without fine particles, and the time for complete dissolution is 100 min.
The implementation also provides a preparation method of the high-temperature-resistant high-salt profile control and flooding agent, according to the using amount of the raw material components of the high-temperature-resistant high-salt profile control and flooding agent, high-salinity saline water, a temperature-resistant salt-resistant polymer, salicylaldehyde and a stabilizer are sequentially added into a beaker, and the mixture is uniformly mixed to obtain the high-temperature-resistant high-salt profile control and flooding agent.
The high-temperature-resistant high-salt profile control and flooding agent prepared by the implementation is subjected to a thermal stability test: the high-temperature-resistant high-salt profile control agent is filled into a plurality of 60mL stainless steel aging tanks and is placed in a drying box with the adjusted temperature (120 ℃), a sample is taken out at intervals, and the apparent viscosity of the gel is observed to evaluate the thermal stability of the gel.
The experiment shows that after 24 hours, the high-temperature-resistant high-salt profile control agent of the embodiment is initially gelled, the measured apparent viscosity is 15000mPa & s, the thermal stability performance is continuously examined for 3 months, and the experimental result is shown in Table 2.
TABLE 2 thermal stability of profile control agent
Note: the common organogel profile control and flooding agent is prepared by mixing the common polymer, the cross-linking agent and the heat stabilizer with the mass fractions of the high-temperature-resistant high-salt profile control and flooding agent and the like in the embodiment. Wherein the stabilizer is sodium thiosulfate and sodium polyphosphate, and the ratio of the stabilizer to the sodium polyphosphate is 1: 0.5.
from the experimental results in table 2, it can be seen that, through the continuous 3-month thermal stability investigation, the viscosity retention rates of the high-temperature-resistant high-salt modifying and flooding agent of the embodiment are respectively as follows: 82.3% and 44.8%, it can be seen that the high temperature and high salt resistant profile control agent of the present embodiment exhibits better thermal stability.
The embodiment also provides the high-temperature-resistant high-salt profile control and flooding agent with the mineralization degree of 5.0 multiplied by 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
Filling quartz sand of 40-60 meshes into a sand filling pipe with the diameter of 2.5cm and the length of 60cm, respectively injecting the high-temperature-resistant high-salt profile control and flooding agent and a common organic gel profile control and flooding agent into a core pipe filled with the quartz sand with the same particle size, sealing two ends of the core pipe, placing the core pipe in a 120 ℃ constant-temperature drying box for keeping constant temperature for 72 hours to gelatinize the core pipe, then injecting water for a displacement experiment, and further investigating the scouring-resistant plugging capability of the profile control and flooding agent, wherein the plugging rates of the high-temperature-resistant high-salt profile control and flooding agent and the organic gel profile control and flooding agent are respectively 89.5% and 75.2%, and the plugging rate of the high-temperature-resistant high-salt profile control and flooding agent is improved by 14.3% compared with the common organic gel profile control.
Example 3
The embodiment provides a high temperature and high salt resistant profile control agent suitable for a high water content oil field, and the raw material components of the high temperature and high salt resistant profile control agent comprise:
the hypersalinity formation water comprises 10% of NaCl and 1% of CaCl based on the weight of the hypersalinity formation water as 100%21% MgCl20.6% of Na2SO4And the balance deionized water.
The preparation method of the high temperature resistant and salt resistant polymer in the embodiment comprises the following steps: 72.64 parts by weight of deionized water, 20 parts by weight of acrylamide, 3 parts by weight of sodium acrylate, 4 parts by weight of sodium styrene sulfonate and 0.04 part by weight of N, N-dioctylacrylamide are sequentially added into a jar with a stopper at the temperature of 12 ℃, nitrogen is introduced for 15min, then 0.08 part by weight of ammonium persulfate, 0.04 part by weight of sodium sulfite and 0.2 part by weight of tetramethylethylenediamine are added, nitrogen is continuously introduced for 5min and then sealed, granulation and drying are carried out after the polymerization reaction is finished, screening treatment is carried out on the mixture by respectively passing through 20-mesh and 60-mesh screens, and the polymer which cannot be filtered out by the 60-mesh screen is the temperature-resistant and salt-resistant polymer of the embodiment.
The temperature and salt resistant polymer was tested for solubility by charging with 100g of hypersaline brine (10% wtNaCl + 1% wtCaCl)2+1％wtMgCl2+0.6％wtNa2SO4) 0.6g of the temperature-resistant and salt-resistant polymer is added into the beaker, and after stirring, the temperature-resistant and salt-resistant polymer solution is found to be uniform and stable without fine particles, and the time for complete dissolution is 105 min.
The implementation also provides a preparation method of the high-temperature-resistant high-salt profile control and flooding agent, according to the using amount of the raw material components of the high-temperature-resistant high-salt profile control and flooding agent, high-salinity saline water, a temperature-resistant salt-resistant polymer, salicylaldehyde and a stabilizer are sequentially added into a beaker, and the mixture is uniformly mixed to obtain the high-temperature-resistant high-salt profile control and flooding agent.
The high-temperature-resistant high-salt profile control and flooding agent prepared by the implementation is subjected to a thermal stability test: the high-temperature-resistant high-salt profile control agent is filled into a plurality of 60mL stainless steel aging tanks and is placed in a drying box with the adjusted temperature (120 ℃), a sample is taken out at intervals, and the apparent viscosity of the gel is observed to evaluate the thermal stability of the gel.
Experiments show that after 24 hours, the high-temperature-resistant high-salt profile control agent of the embodiment is initially gelled, the measured apparent viscosity is 22500mPa & s, the thermal stability performance is continuously examined for 3 months, and the experimental results are shown in Table 3.
TABLE 3 thermal stability of profile control agent
Note: the common organogel profile control and flooding agent is prepared by mixing the common polymer, the cross-linking agent and the heat stabilizer with the mass fractions of the high-temperature-resistant high-salt profile control and flooding agent and the like in the embodiment. Wherein the stabilizer is sodium thiosulfate and sodium polyphosphate, and the ratio of the stabilizer to the sodium polyphosphate is 1: 0.5.
from the experimental results in table 3, it can be seen that, through the continuous 3-month thermal stability investigation, the viscosity retention rates of the high-temperature-resistant high-salt modifying and flooding agent of the embodiment are respectively as follows: 84.2% and 45%, it can be seen that the high temperature and high salt resistant profile control agent of the present embodiment shows better thermal stability.
The embodiment also provides the high-temperature-resistant high-salt profile control and flooding agent with the mineralization degree of 5.0 multiplied by 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
Filling quartz sand of 40-60 meshes into a sand filling pipe with the diameter of 2.5cm and the length of 60cm, respectively injecting the high-temperature-resistant high-salt profile control and flooding agent and a common organic gel profile control and flooding agent into a core pipe filled with the quartz sand with the same particle size, sealing two ends of the core pipe, placing the core pipe in a 120 ℃ constant-temperature drying box for keeping constant temperature for 72 hours to gelatinize the core pipe, then injecting water for a displacement experiment, and further investigating the scouring-resistant plugging capability of the profile control and flooding agent, wherein the plugging rates of the high-temperature-resistant high-salt profile control and flooding agent and the organic gel profile control and flooding agent are respectively 94.5% and 75.1%, and the plugging rate of the high-temperature-resistant high-salt profile control and flooding agent is improved by 19.4% compared with the common organic gel profile control.
Example 4
The embodiment provides a high temperature and high salt resistant profile control agent suitable for a high water content oil field, and the raw material components of the high temperature and high salt resistant profile control agent comprise:
the hypersalinity formation water comprises 10% of NaCl and 1% of CaCl based on the weight of the hypersalinity formation water as 100%21% MgCl20.6% of Na2SO4And the balance deionized water.
The preparation method of the high temperature resistant and salt resistant polymer in the embodiment comprises the following steps: at the temperature of 12 ℃, 72.78 parts by weight of deionized water, 20 parts by weight of acrylamide, 2 parts by weight of sodium acrylate, 5 parts by weight of sodium styrene sulfonate and 0.05 part by weight of N, N-dioctylacrylamide are sequentially added into a jar with a stopper, nitrogen is introduced for 15min, then 0.1 part by weight of ammonium persulfate, 0.05 part by weight of sodium sulfite and 0.2 part by weight of tetramethylethylenediamine are added, nitrogen is continuously introduced for 5min and then sealed, granulation and drying are carried out after the polymerization reaction is finished, screening treatment is carried out on the mixture by respectively passing through 20-mesh and 60-mesh screens, and the polymer which cannot be filtered out by the 60-mesh screen is the temperature-resistant and salt-resistant polymer of the embodiment.
The temperature and salt resistant polymer was tested for solubility by charging with 100g of hypersaline brine (10% wtNaCl + 1% wtCaCl)2+1％wtMgCl2+0.6％wtNa2SO4) 0.6g of the temperature-resistant and salt-resistant polymer is added into the beaker, and after stirring, the temperature-resistant and salt-resistant polymer solution is found to be uniform and stable without fine particles, and the time for complete dissolution is 110 min.
The implementation also provides a preparation method of the high-temperature-resistant high-salt profile control and flooding agent, according to the using amount of the raw material components of the high-temperature-resistant high-salt profile control and flooding agent, high-salinity saline water, a temperature-resistant salt-resistant polymer, salicylaldehyde and a stabilizer are sequentially added into a beaker, and the mixture is uniformly mixed to obtain the high-temperature-resistant high-salt profile control and flooding agent.
The high-temperature-resistant high-salt profile control and flooding agent prepared by the implementation is subjected to a thermal stability test: the high-temperature-resistant high-salt profile control agent is filled into a plurality of 60mL stainless steel aging tanks and is placed in a drying box with the adjusted temperature (120 ℃), a sample is taken out at intervals, and the apparent viscosity of the gel is observed to evaluate the thermal stability of the gel.
Experiments show that after 24 hours, the high-temperature-resistant high-salt profile control agent of the embodiment is initially gelled, the measured apparent viscosity is 2450 mPa & s, the thermal stability performance is continuously examined for 3 months, and the experimental results are shown in Table 4.
TABLE 4 thermal stability of profile control agent
Note: the common organic gel profile control agent is prepared from common polymers, a cross-linking agent and a heat stabilizer which are equal in mass fraction to the high-temperature-resistant high-salt profile control agent in the embodiment, wherein the stabilizer is sodium thiosulfate and sodium polyphosphate, and the ratio of the sodium thiosulfate to the sodium polyphosphate is 1: 0.5.
from the experimental results in table 4, it can be seen that, through the continuous 3-month thermal stability investigation, the viscosity retention rates of the high-temperature-resistant high-salt modifying and flooding agent of the embodiment are respectively as follows: 85.3% and 45.3%, it can be seen that the high temperature and high salt resistant profile control agent of the present embodiment exhibits better thermal stability.
The embodiment also provides the high-temperature-resistant high-salt profile control and flooding agent with the mineralization degree of 5.0 multiplied by 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
Filling 40-60 meshes of quartz sand into a sand filling pipe with the diameter of 2.5cm and the length of 60cm, respectively injecting the high-temperature-resistant high-salt profile control and flooding agent and a common organic gel profile control and flooding agent into a core pipe filled with the quartz sand with the same particle size, sealing two ends of the core pipe, placing the core pipe in a 120 ℃ constant-temperature drying box for keeping constant temperature for 72 hours to gelatinize the core pipe, then injecting water for a displacement experiment, and further investigating the scouring-resistant plugging capability of the profile control and flooding agent, wherein the plugging rates of the high-temperature-resistant high-salt profile control and flooding agent and the organic gel profile control and flooding agent are respectively 96.3% and 74.8%, and compared with the common organic gel profile control and flooding agent, the plugging rate of the high-temperature-resistant high-salt profile control and flooding agent is improved by.
In conclusion, the high-temperature-resistant high-salt profile control agent provided by the invention can be suitable for deep fluid profile control of a high-water-content oil field, can resist hypersalinity, has controllable gelling time and high gelling viscosity, can realize deep fluid diversion, effectively plugs a high-permeability layer and achieves the purpose of plugging the high-salinity oil reservoir high-permeability layer.
Claims (4)
1. The high-temperature-resistant high-salt profile control and flooding agent is characterized by comprising the following raw material components in parts by weight of 100 parts:
0.5-0.6 part of temperature-resistant and salt-resistant polymer
0.4 to 0.6 portion of cross-linking agent
0.3 to 0.5 portion of stabilizer
And the balance of hypersalinity formation water;
the heat-resistant salt-resistant polymer is prepared from four raw materials, namely acrylamide, sodium acrylate, sodium styrene sulfonate and N, N-dioctyl acrylamide, according to a mass ratio of 19-20: 2-3: 2-5: 0.02 to 0.05 of a copolymer formed by copolymerization;
the temperature-resistant and salt-resistant polymer copolymerization method comprises the following steps:
mixing the raw materials for preparing the temperature-resistant and salt-resistant polymer at the temperature of 10-15 ℃, adding water to obtain a mixed solution, introducing nitrogen into the mixed solution for 10-15min, then adding tetramethylethylenediamine, ammonium persulfate and sodium sulfite, continuing introducing nitrogen for 3-5min, then granulating, drying and screening by a mesh screen to obtain the temperature-resistant and salt-resistant polymer;
wherein, every 100 weight parts of mixed solution comprises 0.1 to 0.2 part of tetramethylethylenediamine, 0.05 to 0.1 part of ammonium persulfate, 0.025 to 0.05 part of sodium sulfite, 24.02 to 27.05 parts of raw materials of temperature-resistant and salt-resistant polymer and the balance of water;
the mesh sieving is performed by sequentially passing through 20-mesh and 60-mesh sieves, and the polymer which cannot be filtered out by the 60-mesh sieve is the temperature-resistant salt-resistant polymer;
the stabilizer is sodium thiosulfate and sodium polyphosphate in a mass ratio of 1: 0.3-0.5 of a compound mixture;
the hypersalinity formation water comprises 10% of NaCl and 1% of CaCl based on the weight of the hypersalinity formation water as 100%21% MgCl20.6% of Na2SO4And the balance deionized water.
2. The high-temperature and high-salt resistant profile control agent according to claim 1, wherein: the cross-linking agent is salicylaldehyde.
3. The preparation method of the high-temperature and high-salt resistant profile control agent as claimed in any one of claims 1-2, which comprises the following steps:
adding a temperature-resistant salt-resistant polymer, a cross-linking agent and a stabilizing agent into the hypersalinity water, and mixing and stirring uniformly to obtain the high-temperature-resistant high-salt profile control agent.
4. The high temperature and high salt resistant profile control agent as defined in any one of claims 1-2, having a degree of mineralization of 5.0 x 104mg/L-15×104And (3) application of mg/L oil reservoir profile control and water shutoff.
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| CN111073625B (en) * | 2018-10-22 | 2022-10-04 | 中国石油化工股份有限公司 | Modifying and flooding agent and preparation method thereof |
| EP3950729A4 (en) * | 2019-03-29 | 2022-12-28 | Sumitomo Seika Chemicals Co., Ltd. | Water-absorbing resin and water-blocking material |
| CN111058816B (en) * | 2020-01-03 | 2022-02-22 | 中国石油化工股份有限公司 | Improve CO2Miscible-phase flooding recovery method |
| CN112898484B (en) * | 2021-01-29 | 2022-04-08 | 廊坊易砚领创科技有限公司 | Oil-gas field plugging-regulating and flooding multifunctional medicament and preparation process thereof |
| CN113176180A (en) * | 2021-03-09 | 2021-07-27 | 济南雅歌新材料科技有限公司 | Method for measuring stability of profile control and flooding microsphere aqueous solution |
| CN115322759B (en) | 2022-09-14 | 2023-05-09 | 中国石油大学(华东) | Modified nano graphite gel dispersion system, gel dispersion and preparation method thereof |
| CN115746809A (en) * | 2022-11-18 | 2023-03-07 | 中海石油(中国)有限公司 | Lignin reinforced emulsion polymer gel profile control and flooding agent for ultrahigh-temperature high-salinity oil reservoir |
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| EP2436749A1 (en) * | 2005-06-13 | 2012-04-04 | Sun Drilling Products Corporation | Thermoset particles with enhanced crosslinking, processing for their production, and their use in oil and natural gas drilling applications |
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