CN118185604A - Environment-friendly neutral blocking remover and preparation method and application thereof - Google Patents
Environment-friendly neutral blocking remover and preparation method and application thereof Download PDFInfo
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- CN118185604A CN118185604A CN202410163669.6A CN202410163669A CN118185604A CN 118185604 A CN118185604 A CN 118185604A CN 202410163669 A CN202410163669 A CN 202410163669A CN 118185604 A CN118185604 A CN 118185604A
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- component
- environment
- acid
- blocking remover
- friendly neutral
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 88
- 230000007935 neutral effect Effects 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 39
- 239000011973 solid acid Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002775 capsule Substances 0.000 claims abstract description 28
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 15
- 239000011734 sodium Substances 0.000 claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 15
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 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 claims abstract description 14
- QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 14
- 229960003330 pentetic acid Drugs 0.000 claims abstract description 14
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229940077388 benzenesulfonate Drugs 0.000 claims abstract description 13
- SRSXLGNVWSONIS-UHFFFAOYSA-M benzenesulfonate Chemical compound [O-]S(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000003208 petroleum Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical group [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 8
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 claims description 6
- 239000004304 potassium nitrite Substances 0.000 claims description 6
- 235000010289 potassium nitrite Nutrition 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 5
- WTDHULULXKLSOZ-UHFFFAOYSA-N Hydroxylamine hydrochloride Chemical compound Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 claims description 4
- 235000010288 sodium nitrite Nutrition 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000020477 pH reduction Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000013494 PH determination Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 230000002579 anti-swelling effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011163 secondary particle Substances 0.000 description 1
- -1 sodium amino acid Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses an environment-friendly neutral blocking remover which consists of a component A and a component B, wherein the component A and the component B are respectively prepared from the following raw materials in parts by weight according to 100 percent: component A: 20-30% of ethylenediamine tetraacetic acid, 5-10% of diethylenetriamine pentaacetic acid, 2-5% of potassium hydroxide, 10-20% of ammonia water solution, 5-10% of ethylene glycol monobutyl ether, 10-20% of nitrite and the balance of water; component B: 1-5% of ammonium chloride, 5-10% of sodium petroleum benzene sulfonate, 2-5% of solid acid wrapped by a capsule and the balance of water; wherein the capsule wraps the solid acid according to the mass of the solid acid. Meanwhile, the invention also discloses a preparation method of the blocking remover and application of the blocking remover in oilfield blocking removal. The blocking remover does not fall off scale slag and generate sediment when in blocking removal, can remove inorganic scale and organic scale at the same time, and solves the problems of single system performance and low blocking removal efficiency of the existing blocking remover.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to an environment-friendly neutral blocking remover, and a preparation method and application thereof.
Background
The prolonged oil field belongs to a typical low-permeability ultra-low-permeability oil field, and the oil field is directly scrapped from an oil-water well and equipment which are seriously blocked and cannot normally work for prolonged oil fields because the stratum is seriously blocked due to the relatively backward exploitation technology in the middle and late development period. These problems greatly increase the oil extraction cost and seriously affect the normal production of oil gas. In order to better address the problem of scaling in oilfield formations and oil recovery pumps and equipment, it is desirable to use a plugging breaker product.
At present, the oilfield adopts acidification blocking removal, biological blocking removal and solvent blocking removal, and mainly adopts acidification blocking removal. The acidification blocking removal is a technological measure for improving the permeability of the stratum and realizing the increase of the yield of an oil well and the injection of a water injection well by means of chemical corrosion action of inorganic acid (hydrochloric acid, hydrofluoric acid, nitric acid, earth acid) or organic acid (formic acid, acetic acid and the like) on stratum rock and plugs and hydraulic action of acidification pressure. Hydrochloric acid and earth acid used for acidification are strong acids, the reaction of the hydrochloric acid and carbonate is too fast, the formation at the near well position is easy to be excessively acidified, and the far part cannot be acidified. Compared with a high-permeability oil reservoir, the low-permeability oil reservoir is more sensitive to plugs, the acid plugging removal agent has larger damage to the sandstone skeleton, so that the rock in a near-wellbore zone is easily broken, secondary particles are caused to migrate, acid-sensitive plugs are formed, and meanwhile, the acidizing fluid has extremely strong corrosiveness and oxidability and has extremely high destructiveness to ground equipment and pipe columns.
Chinese patent CN104194757a discloses a neutral descaling and blocking remover composition for oil field mechanical production well, the synthesized final product is solid powder, the ammonium persulfate therein is easy to fail when exposed to the outside for a long time, and the solid powder blocking remover needs to be prepared with liquid alone during site construction, which has complicated procedure and high cost.
Chinese patent CN104194759A discloses a neutral blocking remover composition for oil extraction stratum of oil field and a preparation method thereof, because the components of the composition contain acidic substances such as sodium amino acid, vanadium pentoxide, sodium p-hydroxysulfonate and the like, the composition has strong acid etching effect; in addition, the liquid is required to be prepared independently during site construction, the types of additives are multiple, the construction process is complex, and the synthesis cost is high.
With the continuous exploitation of crude oil in stratum, the pressure and temperature of stratum change, a sudden drop zone of pressure drop is formed in near well zone, so that the crystallization and precipitation of some inorganic salts and organic matters in stratum are aggravated, and the blockage of near well zone, well bore, well shaft and the like is formed. The scale-like components of different oil fields and oil wells are different. The blocking remover in the prior art has low blocking removing efficiency, can only remove inorganic scale in a reservoir, is ineffective to remove organic scale, and cannot achieve the purpose of blocking removal in a real sense. Solves the scaling problems, and simultaneously eliminates inorganic scale and organic scale, which has great significance for improving the oil and gas yield increasing efficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the environment-friendly neutral plugging remover, the preparation method and the application thereof, and the plugging remover not only can remove inorganic plugs, but also can effectively remove organic scales of a stratum, and simultaneously can generate a large amount of gas in the plugging removing process, effectively dredge plugging removing cracks and accelerate the residual liquid flowback rate.
The environment-friendly neutral blocking remover consists of a component A and a component B, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent and are respectively composed of the following raw materials in parts by weight:
Component A: 20-30% of ethylenediamine tetraacetic acid, 5-10% of diethylenetriamine pentaacetic acid, 2-5% of potassium hydroxide, 10-20% of ammonia water solution, 5-10% of ethylene glycol monobutyl ether, 10-20% of nitrite and the balance of water;
Component B: 1-5% of ammonium chloride, 5-10% of sodium petroleum benzene sulfonate, 2-5% of solid acid wrapped by a capsule and the balance of water; wherein the capsule wraps the solid acid according to the mass of the solid acid.
Preferably, the volume ratio of the component A to the component B is 1:1-1:2.
Preferably, the concentration of the aqueous ammonia solution is 25-28%.
Preferably, the nitrite is sodium nitrite or potassium nitrite.
Preferably, the capsule wraps the solid acid, wherein the solid acid is one of citric acid, oxalic acid and sulfamic acid, and the capsule is a normal-temperature water-soluble plasticizable polymer material.
Preferably, the capsule is one of polyvinyl alcohol with low polymerization degree and sodium carboxymethyl cellulose film; the solid acid is one or more of citric acid, sulfamic acid or hydroxylamine hydrochloride.
The preparation method of the environment-friendly neutral blocking remover comprises the following steps:
(1) Preparing a component A: mixing ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, potassium hydroxide, ammonia water solution, ethylene glycol monobutyl ether, nitrite and water under stirring, and stirring until the raw materials are dissolved to obtain a component A;
(2) Preparing a component B: mixing ammonium chloride, sodium petroleum benzene sulfonate, solid acid and water, and stirring for 35-45min to obtain component B.
The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction.
Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 10-20% of the weight of the scale sample, and the well is shut in at 45-85 ℃ for 8-20h.
More preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 10 percent of the weight of the scale sample, and the well is shut in at 45 ℃ for 20 hours.
The solid acid disclosed by the invention is prepared by adopting the prior art.
In the invention, the component A is used as the main component of the blocking remover, and the component B is used as the initiator of the complex blocking remover; during construction, after the component A and the component B are mixed, nitrite reacts with ammonium chloride and capsule solid acid to generate a large amount of heat and nitrogen, and chelating agents of ethylenediamine tetraacetic acid and diethylenetriamine pentaacetic acid are subjected to complexation blocking removal with inorganic scale, so that the inorganic scale which is insoluble in water is changed into soluble inorganic salt, and the inorganic scale is removed; in the presence of a large amount of heat, the dissolution and removal of organic scales such as wax, colloid and asphaltene are achieved, and the removal of the organic scales is achieved.
The invention has the advantages that:
1. the blocking remover disclosed by the invention does not fall off scale slag and does not generate precipitate when in blocking removal, can remove inorganic scale and organic scale at the same time, and solves the problems of single performance and low blocking removal efficiency of the existing blocking remover system;
2. The blocking remover has the characteristics of good complexation and self-energy generation, low damage to stratum and high blocking removing efficiency. Complexing to remove inorganic scale, generating heat to remove organic scale, and reacting to produce KCl when nitrite is potassium nitrite, wherein the KCl has an anti-swelling effect, and a large amount of generated gas has a channel dredging effect;
3. The blocking remover disclosed by the invention is nontoxic and harmless in waste liquid generated after blocking removal, and does not need to be discharged, so that the cost of waste liquid treatment is reduced;
4. The blocking remover disclosed by the invention has good compatibility with a produced water additive system;
5. The blocking remover disclosed by the invention has the pH value of 6-8, and is safe and reliable.
Detailed Description
Example 1
1. The environment-friendly neutral blocking remover consists of a component A and a component B according to a volume ratio of 1:1, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the components are respectively composed of the following raw materials in parts by weight:
Component A: 20% of ethylenediamine tetraacetic acid, 5% of diethylenetriamine pentaacetic acid, 2% of potassium hydroxide, 10% of 25wt% of ammonia water solution, 10% of ethylene glycol monobutyl ether, 10% of potassium nitrite and the balance of water;
component B: 1% of ammonium chloride, 5% of sodium petroleum benzene sulfonate, 5% of solid acid coated on a capsule and the balance of water;
Wherein the capsule wraps the solid acid, the solid acid is citric acid, and the capsule is a sodium carboxymethyl cellulose film.
2. The preparation method of the environment-friendly neutral blocking remover comprises the following steps:
(1) Preparing a component A: mixing ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, potassium hydroxide, ammonia water solution, ethylene glycol monobutyl ether, nitrite and water under stirring, and stirring until the raw materials are dissolved to obtain a component A;
(2) Preparing a component B: mixing ammonium chloride, sodium petroleum benzene sulfonate, solid acid and water, and stirring for 40min to obtain component B.
3. The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction. Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
Example 2
1. The environment-friendly neutral blocking remover consists of a component A and a component B according to a volume ratio of 1:1, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the components are respectively composed of the following raw materials in parts by weight:
component A: 30% of ethylenediamine tetraacetic acid, 10% of diethylenetriamine pentaacetic acid, 5% of potassium hydroxide, 20% of 25% by weight of ammonia water solution, 5% of ethylene glycol monobutyl ether, 20% of potassium nitrite and the balance of water;
component B: 5% of ammonium chloride, 10% of sodium petroleum benzene sulfonate, 2% of solid acid coated on a capsule and the balance of water;
Wherein the capsule wraps the solid acid, the solid acid is citric acid, and the capsule is a sodium carboxymethyl cellulose film.
2. The preparation method of the environment-friendly neutral blocking remover is the same as that of the embodiment 1.
3. The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction. Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
Example 3
1. The environment-friendly neutral blocking remover consists of a component A and a component B according to a volume ratio of 1:1, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the components are respectively composed of the following raw materials in parts by weight:
Component A: 25% of ethylenediamine tetraacetic acid, 8% of diethylenetriamine pentaacetic acid, 3% of potassium hydroxide, 15% of 25wt% of ammonia water solution, 8% of ethylene glycol monobutyl ether, 15% of potassium nitrite and the balance of water;
Component B: 3% of ammonium chloride, 8% of sodium petroleum benzene sulfonate, 4% of solid acid coated on a capsule and the balance of water;
Wherein the capsule wraps the solid acid, the solid acid is citric acid, and the capsule is a sodium carboxymethyl cellulose film.
2. The preparation method of the environment-friendly neutral blocking remover is the same as that of the embodiment 1.
3. The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction. Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
Example 4
1. The environment-friendly neutral blocking remover consists of a component A and a component B according to a volume ratio of 1:1, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the components are respectively composed of the following raw materials in parts by weight:
component A: 20% of ethylenediamine tetraacetic acid, 10% of diethylenetriamine pentaacetic acid, 3% of potassium hydroxide, 18% of 28wt% of ammonia water solution, 7% of ethylene glycol monobutyl ether, 10% of sodium nitrite and the balance of water;
component B: 1% of ammonium chloride, 5% of sodium petroleum benzene sulfonate, 5% of solid acid coated on a capsule and the balance of water;
wherein the capsules wrap the solid acid, the solid acid is oxalic acid, and the capsules are sodium carboxymethyl cellulose films.
2. The preparation method of the environment-friendly neutral blocking remover comprises the following steps:
(1) Preparing a component A: mixing ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, potassium hydroxide, ammonia water solution, ethylene glycol monobutyl ether, nitrite and water under stirring, and stirring until the raw materials are dissolved to obtain a component A;
(2) Preparing a component B: mixing ammonium chloride, sodium petroleum benzene sulfonate, solid acid and water, and stirring for 30min to obtain component B.
3. The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction. Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
Example 5
1. The environment-friendly neutral blocking remover consists of a component A and a component B according to a volume ratio of 1:1, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the components are respectively composed of the following raw materials in parts by weight:
component A: 30% of ethylenediamine tetraacetic acid, 5% of diethylenetriamine pentaacetic acid, 2% of potassium hydroxide, 10% of 25wt% of ammonia water solution, 5% of ethylene glycol monobutyl ether, 10% of sodium nitrite and the balance of water;
component B: 4% of ammonium chloride, 10% of sodium petroleum benzene sulfonate, 3% of solid acid coated on a capsule and the balance of water;
wherein the capsule wraps the solid acid, the solid acid is sulfamic acid, and the capsule is a sodium carboxymethyl cellulose film.
2. The preparation method of the environment-friendly neutral blocking remover comprises the following steps:
(1) Preparing a component A: mixing ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, potassium hydroxide, ammonia water solution, ethylene glycol monobutyl ether, nitrite and water under stirring, and stirring until the raw materials are dissolved to obtain a component A;
(2) Preparing a component B: mixing ammonium chloride, sodium petroleum benzene sulfonate, solid acid and water, and stirring for 45min to obtain component B.
3. The application of the environment-friendly neutral blocking remover in oilfield blocking removal: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction. Preferably, the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20 hours.
PH value measurement
The pH of the deblocking agents of examples 1 to 5 was measured, and the results are shown in Table 1.
TABLE 1 examples 1-5 neutral blocking remover pH determination
Second, detection of blocking removal effect
The component A and the component B in the blocking remover in the embodiment 2 of the invention are mixed, the blocking remover reacts with 1g of scale sample (wherein calcium carbonate is 60 percent and wax content is 40 percent), and the influence of different addition amounts (the environment-friendly neutral blocking remover occupies the weight of the scale sample), temperature and reaction time on the scale removal rate is studied, and the results are shown in tables 2-3 respectively.
TABLE 2 investigation of the effect of different addition amounts, temperature on the scale removal rate at reaction 8h
TABLE 3 investigation of the effect of different temperatures on the scale removal rate by reaction at 85℃with an addition of 20%
As shown in table 2, as the blocking remover increases and the temperature increases linearly, the scale removing effect tends to increase and then stabilize; as shown in Table 3, when the addition amount of the plugging removing agent is 20%, the scale removing effect is increased and then stabilized along with the extension of the reaction time under the condition that the reaction temperature is 85 ℃, and when the reaction time is more than or equal to 8 hours, the plugging removing effect can basically reach the optimal effect, and the scale removing effect is basically stabilized along with the extension of the reaction time.
Claims (10)
1. An environment-friendly neutral blocking remover is characterized in that: the composite material consists of a component A and a component B, wherein the mass of the component A and the mass of the component B are respectively calculated according to 100 percent, and the component A and the component B consist of the following raw materials in parts by weight:
Component A: 20-30% of ethylenediamine tetraacetic acid, 5-10% of diethylenetriamine pentaacetic acid, 2-5% of potassium hydroxide, 10-20% of ammonia water solution, 5-10% of ethylene glycol monobutyl ether, 10-20% of nitrite and the balance of water;
Component B: 1-5% of ammonium chloride, 5-10% of sodium petroleum benzene sulfonate, 2-5% of solid acid wrapped by a capsule and the balance of water; wherein the capsule wraps the solid acid according to the mass of the solid acid.
2. The environment-friendly neutral blocking remover according to claim 1, wherein: the volume ratio of the component A to the component B is 1:1-1:2.
3. The environment-friendly neutral blocking remover according to claim 2, wherein: the concentration of the ammonia water solution is 25-28%.
4. The environmentally friendly neutral plugging remover according to claim 3, wherein: the nitrite is sodium nitrite or potassium nitrite.
5. The environment-friendly neutral blocking remover according to claim 4, wherein: the capsule wraps the solid acid, wherein the solid acid is one of citric acid, oxalic acid and sulfamic acid, and the capsule is a normal-temperature water-soluble plasticizable polymer material.
6. The environment-friendly neutral blocking remover according to claim 5, wherein: the capsule is one of polyvinyl alcohol with low polymerization degree and sodium carboxymethyl cellulose film; the solid acid is one or more of citric acid, sulfamic acid or hydroxylamine hydrochloride.
7. The method for preparing the environment-friendly neutral blocking remover according to claim 1, which is characterized in that: the method comprises the following steps:
(1) Preparing a component A: mixing ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, potassium hydroxide, ammonia water solution, ethylene glycol monobutyl ether, nitrite and water under stirring, and stirring until the raw materials are dissolved to obtain a component A;
(2) Preparing a component B: mixing ammonium chloride, sodium petroleum benzene sulfonate, solid acid and water, and stirring for 35-45min to obtain component B.
8. The application of the environment-friendly neutral plugging remover in oilfield plugging removal, which is characterized in that: during construction, the component A and the component B of the environment-friendly neutral blocking remover are mixed and then injected into a target layer or a shaft, and the well is closed for reaction.
9. The use of the environment-friendly neutral plugging remover according to claim 8 in oilfield plugging removal, wherein the environment-friendly neutral plugging remover is characterized in that: the environment-friendly neutral blocking remover is added according to the weight accounting for 5-25% of the weight of the scale sample, and the well is shut in at 25-90 ℃ for 4-20h.
10. The use of an environmentally friendly neutral plugging remover according to claim 9 in oilfield plugging removal, wherein: the environment-friendly neutral blocking remover is added according to the weight accounting for 10-20% of the weight of the scale sample, and the well is shut in at 45-85 ℃ for 8-20h.
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