CN114591721A - Infiltration-increasing and sand-stabilizing acidizing composite working fluid for unconsolidated sandstone reservoir and preparation method and application thereof - Google Patents
Infiltration-increasing and sand-stabilizing acidizing composite working fluid for unconsolidated sandstone reservoir and preparation method and application thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000012530 fluid Substances 0.000 title claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000002253 acid Substances 0.000 claims abstract description 66
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 56
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004327 boric acid Substances 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 31
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000012224 working solution Substances 0.000 claims abstract description 17
- RILZRCJGXSFXNE-UHFFFAOYSA-N 2-[4-(trifluoromethoxy)phenyl]ethanol Chemical compound OCCC1=CC=C(OC(F)(F)F)C=C1 RILZRCJGXSFXNE-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001556 precipitation Methods 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- 230000020477 pH reduction Effects 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 8
- 229910052656 albite Inorganic materials 0.000 claims abstract description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 8
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052622 kaolinite Inorganic materials 0.000 claims abstract description 6
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 6
- 239000010453 quartz Substances 0.000 claims abstract description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 5
- 239000010433 feldspar Substances 0.000 claims abstract description 5
- 229940072033 potash Drugs 0.000 claims abstract description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 5
- 235000015320 potassium carbonate Nutrition 0.000 claims abstract description 5
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 5
- -1 cycloalkyl imidazoline Chemical compound 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 229920006317 cationic polymer Polymers 0.000 claims description 15
- 150000002191 fatty alcohols Chemical class 0.000 claims description 15
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 13
- 230000000996 additive effect Effects 0.000 claims description 13
- 229910004074 SiF6 Inorganic materials 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229910004039 HBF4 Inorganic materials 0.000 claims description 8
- 230000002579 anti-swelling effect Effects 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000036632 reaction speed Effects 0.000 claims description 5
- 229910003638 H2SiF6 Inorganic materials 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 4
- OKZIUSOJQLYFSE-UHFFFAOYSA-N difluoroboron Chemical compound F[B]F OKZIUSOJQLYFSE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- ZEFWRWWINDLIIV-UHFFFAOYSA-N tetrafluorosilane;dihydrofluoride Chemical compound F.F.F[Si](F)(F)F ZEFWRWWINDLIIV-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- RKKOMEIYHHASIN-UHFFFAOYSA-N hydroperoxyboronic acid Chemical compound OOB(O)O RKKOMEIYHHASIN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 229910052651 microcline Inorganic materials 0.000 claims description 2
- 229910052652 orthoclase Inorganic materials 0.000 claims description 2
- 229910052654 sanidine Inorganic materials 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 3
- 238000007599 discharging Methods 0.000 claims 2
- DURPTKYDGMDSBL-UHFFFAOYSA-N 1-butoxybutane Chemical compound CCCCOCCCC DURPTKYDGMDSBL-UHFFFAOYSA-N 0.000 claims 1
- 239000000839 emulsion Substances 0.000 claims 1
- 230000000638 stimulation Effects 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 230000001965 increasing effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 3
- 150000002892 organic cations Chemical class 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010059866 Drug resistance Diseases 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910020440 K2SiF6 Inorganic materials 0.000 description 1
- 229910004883 Na2SiF6 Inorganic materials 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229940104869 fluorosilicate Drugs 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000013519 translation 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention provides a permeability-increasing and stable sand acidizing composite working solution for a loose sandstone reservoir, and a preparation method and application thereof. The composite working solution can be used for deep slow acidification to increase the permeability of a unconsolidated sandstone reservoir and improve the productivity of an oil-water well; fluosilicic acid is used as main acid, can react with albite, potash feldspar, kaolinite and montmorillonite in a reservoir under the combined action of hydrochloric acid and acetic acid, does not react with a silica framework in quartz basically, and boric acid is used for absorbing the fluosilicic acid and the fluoboric acid to generate hydrofluoric acid, so that the sandstone framework is protected, and the sandstone framework is prevented from being damaged by acidification, and thus sand production blockage is aggravated; the boric acid and the fluoroboric acid are cooperated to repair the unconsolidated sandstone reservoir; the boric acid, the hydrochloric acid and the acetic acid jointly prevent the generation of secondary precipitation of fluosilicate except calcium fluoride.
Description
Technical Field
The invention relates to the technical field of oil field reservoir production increasing measures, in particular to a permeability-increasing and stable sand acidizing composite working fluid for a loose sandstone reservoir and a preparation method and application thereof.
Background
The proportion of loose sandstone of China offshore oil field is high, statistics is made on that the proportion of Bohai oil field with the largest crude oil yield reaches more than 80%, damage blockage such as particle migration and mud easily exists in the production process, acidification is an effective measure process technology for removing the blockage of a near well, statistics is made on that the construction amount per year reaches 400 times and 500 times per year, and the technology is a main production increasing measure technology on the sea.
An acidification working solution system adopting fluosilicic acid as a main agent is a new direction for research and application in recent 20 years at home and abroad, has the obvious advantage of not damaging a sandstone framework, but does not form large-scale application, and sporadically shows reports of 'Wangbaofeng, Zhao' research on a fluosilicic acid/hydrochloric acid system for removing deep clay blockage of a reservoir [ J ]. oilfield chemistry, 2001,18(4):311 + 313. ',' Eduardo P.da Motta (SPE Drilling & Completion), Lihu (translation) 'a novel fluosilicic acid system for removing deep clay damage [ J ]. foreign oilfield engineering, 2003,19(1): 13-15.', and 'the published patent CN 105255467A' is a composite blockage remover for compact oil reservoirs. While the above documents focus on the advantages of fluosilicic acid, no mention or control is made on the influence of fluosilicic acid on the generation of secondary precipitation of fluosilicate from formation sodium and potassium ions, and the influence risk of reservoir damage exists in field application. The reaction equation of the secondary precipitation is as follows:
2Na++H2SiF6→Na2SiF6↓+2H+
2K++H2SiF6→K2SiF6↓+2H+
in addition, the reaction mechanism of fluosilicic acid and albite, potassium feldspar, kaolinite and montmorillonite in a reservoir is not deeply researched, the proper mass percentage of the working solution formula is difficult to accurately control and design under the conditions of different mineral contents in the reservoir, the effect cannot be achieved by a small addition proportion, and the secondary precipitation influence is aggravated by an excessive addition proportion.
In order to control the influence of fluorosilicate precipitation, domestic and foreign researches find that secondary precipitation of fluoride can be effectively controlled by adding boric acid, but the solubility of the boric acid at normal temperature is low, and the current domestic and foreign patent technologies mainly improve the dissolving capacity of the boric acid (the boric acid can meet the mass percentage of 3-5% of a working solution at 0-20 ℃): boric acid and hydrochloric acid solvents as in us patent 2961355 (1960); the boric acid of us patent 4330419 (1982) was dissolved in methanol and made into a solvent with hydrochloric acid; 88103530.0 (1988) in China adopts hydrochloric acid with the weight percentage of 12-25%, fluoroboric acid with the weight percentage of 10-22%, boric acid with the weight percentage of 1-12% and the like to prepare a solvent; chinese 200810197463.6 (2008) adopts 0.01-0.1 wt% of fluorine-containing functional surfactant, 30-80 wt% of high-concentration fluoboric acid, 10-40 wt% of industrial hydrochloric acid, 1-10 wt% of fluosilicic acid, 5-20 wt% of boric acid and 0.1-0.3 wt% of corrosion inhibitor Lan-826. The comprehensive concentration of the compound material is 50 +/-5 percent by weight, and the application process can be completely carried out according to the original convention of a user. For example, the dilution ratio is 0 to 5. Taking china 200810197463.6 (2008) as an example, although fluoboric acid, hydrochloric acid, fluosilicic acid and boric acid are also adopted in the patent, the main technical core problem to be solved is that 30-80% of high-concentration fluoboric acid is adopted to dissolve boric acid to a greater extent, and the function of the fluoboric acid also comprises gradual decomposition of hydrofluoric acid (HF) which is well known in the industry. The fluosilicic acid only releases hydrofluoric acid at high temperature, and the corrosion rate of calcium fluoride is increased. Therefore, the concentration ratio of the fluoboric acid is as high as 30-80%, the ratio of the fluosilicic acid is only 1-10%, even if the dilution ratio is 5, the ratio of the fluoboric acid is still as high as 6-16%, and the ratio of the fluosilicic acid is only 0.2-2%. Therefore, the formula mainly enhances the solubility of boric acid and inhibits the secondary precipitation of fluoride (calcium fluoride), but a large amount of hydrofluoric acid can be still released under the condition of high-concentration fluoroboric acid (main agent), and the system is not beneficial to increasing infiltration and stabilizing sand of a loose sandstone reservoir as the existing systems using fluoroboric acid and the like.
Disclosure of Invention
The invention overcomes the defects in the prior art, the existing acidizing working fluid system has certain drug resistance along with the increase of the number of repeated acidizing wells, the acidizing effective period is shorter and shorter, the yield increasing effect is poorer and poorer, and the production is greatly influenced; fluosilicic acid is used as main acid, can react with albite, potash feldspar, kaolinite and montmorillonite in a reservoir under the combined action of hydrochloric acid and acetic acid, does not react with a silica framework in quartz basically, and boric acid is used for absorbing the fluosilicic acid and the fluoboric acid to generate hydrofluoric acid, so that the sandstone framework is protected, and the sandstone framework is prevented from being damaged by acidification, and thus sand production blockage is aggravated; the boric acid and the fluoroboric acid are cooperated to repair the unconsolidated sandstone reservoir; the boric acid, the hydrochloric acid and the acetic acid jointly prevent the generation of secondary precipitation of fluosilicate except calcium fluoride.
The purpose of the invention is realized by the following technical scheme.
The permeability-increasing and stable sand acidizing composite working solution for the unconsolidated sandstone reservoir consists of hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, a reservoir protection additive and water, wherein the mass percentages of the components are as follows:
wherein the addition amount of hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid and boric acid is HCl and CH3COOH、H2SiF6、HBF4And H3BO3In the composite working solution, the reservoir protection additive is formed by mixing ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, an organic cationic polymer and cycloalkyl imidazoline in percentage by mass, wherein the ethylene glycol monobutyl ether is a mutual solvent, the polyethoxylated fatty alcohol is a demulsification cleanup additive, the organic cationic polymer is an anti-swelling agent, the cycloalkyl imidazoline is a corrosion inhibitor, and the mass ratio of the ethylene glycol monobutyl ether to the polyethoxylated fatty alcohol to the organic cationic polymer to the cycloalkyl imidazoline is 1:1:2: 2.
The acetic acid has four functions of cleaning calcium, resisting high temperature, slowing down the reaction speed of hydrogen ions, stabilizing iron ions and preventing iron from precipitating in the composite working solution.
The fluosilicic acid provides hydrogen ions under the combined action of the hydrochloric acid and the acetic acid, can react with albite, potash feldspar, kaolinite and montmorillonite in a reservoir to be acidified, does not basically react with a silica framework in quartz, and simultaneously the acetic acid slows down the reaction speed of the hydrogen ions, is more beneficial to deep acidification, and has the following reaction equation:
NaAlSi3O8+7H2SiF6+2H+→Na++AlF2 ++10SiF4+8H2O
KAlSi3O8+7H2SiF6+2H+→K++AlF2 ++10SiF4+8H2O
Al4Si4O10(OH)8+12H2SiF6+4H+→4AlF2 ++16SiF4+18H2O
Al4Si8O20(OH)4+20H2SiF6+4H+→4AlF2 ++28SiF4+24H2O
the boric acid reacts with the hydroxyl boric acid ionized by the fluoroboric acid to generate borosilicate with a loose sandstone reservoir repairing function, and simultaneously has two functions of absorbing fluosilicic acid and fluoroboric acid to generate hydrofluoric acid and preventing fluosilicate except calcium fluoride from secondarily precipitating under the combined action of hydrochloric acid and acetic acid in the composite working solution, wherein the reaction equation of the function of absorbing the hydrofluoric acid is as follows:
H3BO3+HF→HBF(OH)3
HBF(OH)3+HF→HBF2(OH)2+H2O
HBF2(OH)2+HF→HBF3(OH)+H2O
HBF3(OH)+HF→HBF4+H2O
the reaction equation for preventing the generation of the secondary precipitation of the fluosilicate is as follows:
2Na2SiF6+H3BO3+4H+→HBF4+4Na++2SiF4+3H2O
2K2SiF6+H3BO3+4H+→HBF4+4K++2SiF4+3H2O
a preparation method of a permeability-increasing and sand-stabilizing composite working solution for a loose sandstone reservoir comprises the steps of adding water into a stirring reaction tank, sequentially adding hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid and a reservoir protection additive into the stirring reaction tank, uniformly stirring for 30-60 minutes, filtering the acid solution to obtain the permeability-increasing and sand-stabilizing composite working solution for the loose sandstone reservoir, wherein the reservoir protection additive is prepared by mixing ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, an organic cationic polymer and cycloalkyl imidazoline, the ethylene glycol monobutyl ether is a mutual solvent, the polyethoxylated fatty alcohol is a demulsification cleanup additive, the organic cationic polymer is an anti-swelling agent and the cycloalkyl imidazoline is an anti-swelling agent, the mass ratio of the ethylene glycol monobutyl ether, the polyethoxylated fatty alcohol, the organic cationic polymer and the cycloalkyl imidazoline is 1:1:2:2, 5-15% of hydrochloric acid, 5-15% of acetic acid, 5-20% of fluosilicic acid, 3-8% of fluoroboric acid, 3-5% of boric acid, 2.5-4% of reservoir protection additive and the balance of water.
The beneficial effects of the invention are as follows: the permeability of a unconsolidated sandstone reservoir is increased by deep retarded acidification, and the productivity of an oil-water well is improved: the acidification reaction speed is controlled by adopting a plurality of means simultaneously to achieve the effect of deep slow acidification, and the method comprises the steps of adding a certain proportion of acetic acid to inhibit the release speed of hydrogen ions and slow down the reaction of fluosilicic acid and fluoboric acid; adding boric acid and fluoroboric acid in a coexistence manner to slow down the reaction of the fluoroboric acid;
does not damage the silica skeleton in the quartz rock: fluosilicic acid is used as main acid, can react with albite, potash feldspar, kaolinite and montmorillonite in a reservoir under the combined action of hydrochloric acid and acetic acid, does not react with a silica framework in quartz basically, and boric acid is used for absorbing the fluosilicic acid and the fluoboric acid to generate hydrofluoric acid, so that the sandstone framework is protected, and the sandstone framework is prevented from being damaged by acidification, and thus sand production blockage is aggravated;
repairing a loose sandstone reservoir and preventing the generation of secondary precipitation of fluosilicate except calcium fluoride: boric acid is adopted to react with formation particles together with hydroxyl boric acid ionized by fluoroboric acid to generate borosilicate with loose sandstone reservoir repairing function, and the borosilicate has the function of preventing generation of secondary precipitation of fluosilicate except calcium fluoride under the combined action of hydrochloric acid and acetic acid.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
In this embodiment, the permeability-increasing and sand-stabilizing acidizing composite working fluid for unconsolidated sandstone reservoir (1000 kg in configuration) comprises the following components by weight:
wherein, the organic cation polymer anti-swelling agent and the naphthenic base imidazoline corrosion inhibitor are purchased from Tiancheng chemical company Limited or Shandong Desshi chemical company Limited in Tianjin.
Adding enough water into an acid-resistant stirring reaction tank, sequentially adding the industrial raw materials into the acid-resistant stirring reaction tank according to the sequence of industrial hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, organic cationic polymer and cycloalkyl imidazoline, uniformly stirring for 30-60 minutes, and filtering acid liquor to obtain a finished product of the working solution.
Example 2
In this embodiment, the permeability-increasing and sand-stabilizing acidizing composite working fluid for unconsolidated sandstone reservoir (1000 kg in configuration) comprises the following components by weight:
wherein, the organic cation polymer anti-swelling agent and the naphthenic base imidazoline corrosion inhibitor are purchased from Tiancheng chemical company Limited or Shandong Desshi chemical company Limited in Tianjin.
Sequentially putting the industrial raw materials into an acid-resistant stirring reaction tank according to the sequence of industrial hydrochloric acid, acetic acid, fluosilicic acid, fluoroboric acid, boric acid, ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, an organic cationic polymer and cycloalkyl imidazoline, uniformly stirring for 30-60 minutes, and filtering acid liquor to obtain a finished product of working solution.
Example 3
In this embodiment, the permeability-increasing and sand-stabilizing acidizing composite working fluid for unconsolidated sandstone reservoir (1000 kg in configuration) comprises the following components by weight:
wherein, the organic cation polymer anti-swelling agent and the naphthenic base imidazoline corrosion inhibitor are purchased from Tiancheng chemical company Limited or Shandong Desshi chemical company Limited in Tianjin.
Adding enough water into an acid-resistant stirring reaction tank, sequentially adding the industrial raw materials into the acid-resistant stirring reaction tank according to the sequence of industrial hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, organic cationic polymer and cycloalkyl imidazoline, uniformly stirring for 30-60 minutes, and filtering acid liquor to obtain a finished product of the working solution.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (8)
1. The permeability-increasing and sand-stabilizing acidizing composite working fluid for the unconsolidated sandstone reservoir is characterized by comprising the following components in parts by weight: the additive comprises hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid, a reservoir protection additive and water, wherein the mass percent of each component is as follows:
wherein the addition amount of hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid and boric acid is HCl and CH3COOH、H2SiF6、HBF4And H3BO3The reservoir protection additive adopts ethylene glycol in the composite working solution according to the mass percentageThe emulsion breaking and discharging assistant is prepared by mixing monobutyl ether, polyethoxylated fatty alcohol, an organic cationic polymer and cycloalkyl imidazoline, wherein the ethylene glycol monobutyl ether is a mutual solvent, the polyethoxylated fatty alcohol is a demulsification and discharging assistant, the organic cationic polymer is an anti-swelling agent, and the cycloalkyl imidazoline is a corrosion inhibitor.
2. The permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir of claim 1, which is characterized in that: the mass ratio of the ethylene glycol monobutyl ether to the polyethoxylated fatty alcohol to the organic cationic polymer to the cycloalkyl imidazoline is 1:1:2: 2.
3. The preparation method of the permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir as claimed in claim 1 or 2, which is characterized by comprising the following steps of: adding water into a stirring reaction tank, sequentially adding hydrochloric acid, acetic acid, fluosilicic acid, fluoboric acid, boric acid and a reservoir stratum protection additive into the stirring reaction tank, uniformly stirring for 30-60 minutes, and filtering the acid liquor to obtain the permeability-increasing and sand-stabilizing acidized composite working solution for the unconsolidated sandstone reservoir stratum, wherein the reservoir stratum protection additive is prepared by mixing ethylene glycol monobutyl ether, polyethoxylated fatty alcohol, an organic cationic polymer and cycloalkyl imidazoline, the ethylene glycol monobutyl ether is a mutual solvent, the polyethoxylated fatty alcohol is a demulsification assistant, the organic cationic polymer is an anti-swelling agent and the cycloalkyl imidazoline is a corrosion inhibitor, the mass percent of hydrochloric acid is 5-15%, the mass percent of acetic acid is 5-15%, the mass percent of fluosilicic acid is 5-20%, and the mass percent of fluoboric acid is 3-8%, the mass percent of the boric acid is 3-5%, the mass percent of the reservoir protection additive is 2.5-4%, and the balance is water.
4. The method for preparing the permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir according to claim 3, which is characterized by comprising the following steps of: the mass ratio of the ethylene glycol monobutyl ether to the polyethoxylated fatty alcohol to the organic cationic polymer to the cycloalkyl imidazoline is 1:1:2: 2.
5. The use of the permeability-increasing and sand-stabilizing acidizing composite working fluid for the unconsolidated sandstone reservoir of claim 1 or 2 in the stimulation of the reservoir in the oil field.
6. The application of the permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir in the production increase of the reservoir in the oil field according to claim 5 is characterized in that: the acetic acid plays a role in cleaning calcium, resisting high temperature, slowing down the reaction speed of hydrogen ions, stabilizing iron ions and preventing iron precipitation in the composite working solution.
7. The application of the permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir as claimed in claim 5 in the production increase of the reservoir in an oil field is characterized in that: the fluosilicic acid provides hydrogen ions under the combined action of the hydrochloric acid and the acetic acid, can react with albite, potash feldspar, kaolinite and montmorillonite in a reservoir to be acidified, does not react with a silica framework in quartz, and meanwhile, the acetic acid slows down the reaction speed of the hydrogen ions, is more beneficial to deep acidification, and has the following reaction equation:
NaAlSi3O8+7H2SiF6+2H+→Na++AlF2 ++10SiF4+8H2O
KAlSi3O8+7H2SiF6+2H+→K++AlF2 ++10SiF4+8H2O
Al4Si4O10(OH)8+12H2SiF6+4H+→4AlF2 ++16SiF4+18H2O
Al4Si8O20(OH)4+20H2SiF6+4H+→4AlF2 ++28SiF4+24H2O。
8. the application of the permeability-increasing and stable sand acidizing composite working fluid for the unconsolidated sandstone reservoir in the production increase of the reservoir in the oil field according to claim 5 is characterized in that: boric acid reacts with formation particles together with hydroxyl boric acid ionized by fluoroboric acid to generate borosilicate with loose sandstone reservoir repairing function, and has two functions of absorbing fluosilicic acid and fluoroboric acid to generate hydrofluoric acid and preventing the generation of secondary precipitation of fluosilicic acid except calcium fluoride under the combined action of hydrochloric acid and acetic acid in composite working fluid, wherein the reaction equation of the function of absorbing hydrofluoric acid is as follows:
H3BO3+HF→HBF(OH)3
HBF(OH)3+HF→HBF2(OH)2+H2O
HBF2(OH)2+HF→HBF3(OH)+H2O
HBF3(OH)+HF→HBF4+H2O
the reaction equation for preventing the generation of the secondary precipitation of the fluosilicate is as follows:
2Na2SiF6+H3BO3+4H+→HBF4+4Na++2SiF4+3H2O
2K2SiF6+H3BO3+4H+→HBF4+4K++2SiF4+3H2O。
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