CN105969329A - Low-permeability reservoir artificial crack high-permeability-grading low-fingering residue-free acidizing fluid and preparation method thereof - Google Patents

Abstract

The invention discloses a low-permeability reservoir artificial crack high-permeability-grading low-fingering residue-free acidizing fluid and a preparation method thereof. The acidizing fluid is prepared from the following raw materials by the weight percentage: 10-15% of an organic solvent, 8-12% of a carrying liquid, 5-8% of acidized particles, 30-35% of an acid fluid, 2-8% of an auxiliary agent, and the balance industrial water. The obtained acidizing fluid can reduce the high (low) permeability grading effect of the acid fluid in artificial cracks, and reduces the fingering phenomenon of the acid fluid in the artificial cracks; a blockage object in the cracks is targetedly unblocked, and at the same time, no solid residue exists in the cracks, so the amount of the acid fluid can be effectively reduced, the utilization efficiency of the acid fluid is enhanced, the reservoir old well reacidizing effects are increased, and repeated transformation of acidizing and unblocking measures of an oil well, being transformed by the artificial cracks, of a low-permeability oilfield is met.

Description

A kind of low permeability reservoir man-made fracture height oozes extreme difference low fingering noresidue acidifying solution and preparation method thereof

Technical field

The present invention relates to oil well acidation liquid technical field, be specifically related to a kind of low permeability reservoir man-made fracture height and ooze pole Low fingering noresidue acidifying solution of difference and preparation method thereof.

Background technology

Low-permeability oilfield is owing to permeability is low, reservoir energy is low at present, when oilfield is developed, the most all needs Fracturing production, produces man-made fracture by pressure break in reservoir and expands drainage area.The most corresponding layout is noted Well carries out synchronizing water filling and increases reservoir energy.After taking effect with injection water water drive, exist in oil well crack and inject Water and formation water, different with ionic species with formation water salinity owing to injecting water, easily tie in man-made fracture Dirt forms blocking, quickly reduces oil well output, affects oil well and normally produce.

Typically use for this kind of blocking oil well acidifying to release tamper, recover oil well productivity.Through fracturing reform After oil reservoir matrix permeability low general 0.1～10mD, and man-made fracture intrinsic permeability is very , in reservoir, there is high and low permeability extreme difference in height, usually about 10～1000 times of matrix permeability Phenomenon is serious.When using common acid solution to be acidified, after acid solution enters stratum, owing to acid liquid viscosity is low, acid solution Typically prolong the big channel flow of man-made fracture；When using the acid solution acidifying of micelle acids, micelle acid acid solution is preferentially entered Entering high seepage flow layer, overwhelming majority acid liquid loss enters injects water water drive passage, makes measure acid solution consumption increase, And fouling and clogging layer does not obtain preferable de-plugging in man-made fracture, acidifying measure oil well output is caused not reach To optimum state.The fouling and clogging thing existence of residual easily causes later stage quick fouling, causes measure effect duration short.

It addition, China Patent No. " 102020983A " disclose a kind of improve formation acidizing section become sticky turn To acid, publication date is on 04 20th, 2011.This patent mainly realizes homogeneous acidification to oil reservoir, reduces Acid solution coning in high permeability formation, hypotonic target zone in making part acid solution enter, improves, expands the ripple of acidifying And section.Originally becoming sticky and turn to acid, pH value controls to become sticky and turn to sour each component, by weight, mainly by with Lower component forms: basis acid solution is 100 parts；Long-chain alkylamide CAB 3～5 parts；Inhibition Agent 1～3 parts；Ferrous stability 0.5～1 part；Clay stabilizer 0.5-1 part.By above-mentioned group Becoming sticky of dividing turns to acid to inject in purpose oil reservoir.In acidization, acid solution initial viscosity is relatively low, at the beginning of at 20 DEG C Beginning viscosity 10-15mPa.s, is easily accessible high permeability formation, and follow-up unreacted low viscosity acid solution self-steering enters In entering, less permeable layer.The diversion agent that the present invention uses is long-chain alkylamide CAB, is a kind of two Property surfactant, after breaking gel without the residue of macromole, to reservoir without secondary injury.China Patent No. " CN 103820098B " a kind of fanout free region self-diverting acid and preparation method and application, the day for announcing is 2016 01 The moon 20.This self-diverting acid component of this patent is: hydroxyl sulfoacid salt form amphoteric surfactant 3-10%, Polybasic carboxylic acid chelating agen 1-5%, acid 10-28%, remaining is water；Its preparation method is in proportion by acid and water Mix homogeneously, adds hydroxyl sulfoacid salt form amphoteric surfactant, polybasic carboxylic acid chelating agen, and mix homogeneously is i.e. ?.Fanout free region self-diverting acid of the present invention is for Carbonate Reservoir, the acidifying acid fracturing volume increase of sandstone oil reservoir.Should Self-diverting acid is difficult to generate insoluble calcium and magnesium salt, to stratum fanout free region；Product good fluidity, easy construction.

Above-mentioned patent is mainly used in controlling acid liquid viscosity by pH value and changes, and makes acid solution by acid solution at heterogeneous body Property reservoir in high permeability formation turn to hypotonic target zone, reduce acid solution coning in high permeability formation, it is achieved uniformly acid Change, improve reservoir permeability.But, low-permeability oilfield reservoir is general all through certain scale fracturing reform, well Cylinder near wellbore zone creates man-made fracture, and crack intrinsic permeability is far longer than reservoir matrix permeability.Only with viscous Degree raises (being increased to 50-200mPa.s from 10-15mPa.s), not enough so that fluid turns to from man-made fracture To substrate or colmatation zone (permeability extreme difference is big)；After front end acid liquid viscosity raises, acid liquid viscosity below The most relatively low, easily cause acid solution fingering, acid solution can not block because acidifying residue produces secondary to reservoir simultaneously, Affect measure effect.Therefore, for there is the de-plugging problem of blocking in low permeability reservoir oil well man-made fracture, need Research and develop a kind of acidifying solution formula that can solve problem above.

Summary of the invention

For solving the problems referred to above, the invention provides a kind of low permeability reservoir man-made fracture height ooze the low fingering of extreme difference without Residual acidifying solution and preparation method thereof, gained acidifying solution can reduce acid solution high (low) infiltration in man-made fracture Rate extreme difference effect, reduces acid solution fingering phenomenon in man-made fracture, and in fracture, tamper carries out specific aim solution Stifled, Solid Free residual in crack, can effectively reduce acid solution consumption simultaneously, promotes acid solution utilization ratio, carries High reservoir old well reacidizing effect, meets low-permeability oilfield and arranges through man-made fracture improved oil well acidation de-plugging Execute and repeat transformation.

For achieving the above object, the technical scheme that the present invention takes is:

A kind of low permeability reservoir man-made fracture height oozes extreme difference low fingering noresidue acidifying solution, by following percentage by weight Raw material be prepared from:

Organic solvent 10-15%；Carry liquid 8-12%；Acidifying granule 5-8%；Acid solution 30-35%；Auxiliary agent 2-8%； Surplus water for industrial use.

Wherein, described organic solvent is made up of one or both in isopropanol, isooctanol or n-octyl alcohol, with Percentage by weight meter in described acidifying solution, isopropanol percentage by weight is 5～7.5%；Isooctanol, just The percentage by weight of capryl alcohol or isooctanol and n-octyl alcohol mixture is 5～7.5%.

Wherein, described in carry liquid and be made up of component A and B component, component A is by accounting for acidifying solution percentage by weight It is the double eicosyl Dimethyl Ammonium of chlorination of 0.5～2%, account for that acidifying solution percentage by weight is 0.5～2% two Stearmide ethyl glycidyl aliquat, accounts for the composition N-that acidifying solution percentage by weight is 1～5% Carboxymethyl-N-hydroxyl-2-heptadecyl imidazole quinoline sodium salt；B component is calculated as by accounting for acidifying solution percentage by weight 2～the sodium p-octadecyl toluene sulfonate of 6%, 2,5-dihydroxy-4-(1-methyl heptadecyl) benzenesulfonic acid list sodium In one or more.

Wherein, described acidifying granule is mixed by the raw material of following percentage by weight: 70-100 mesh I Primary glue 50%, tert butyl phenolic resin, 4-hydroxydiphenyl urea formaldehyde, terpene resin, N-crassitude One or more in ketone 50%.

Wherein, described acid solution is mixed gained, C by component C, D component and component E in mass ratio 3: 2: 1 Component is one or more in hydrochloric acid, nitric acid；D component is in trifluoroacetic acid, ammonium acid fluoride, fluoboric acid One or more；Component E is the one in chloroacetic acid, dichloroacetic acid, trichloroacetic acid, formic acid or several Kind.

Wherein, described auxiliary agent is by iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium, cocinic acid two Glycollic amide, 2-(1-anilino-) benzyl-Ketohexamethylene composition；With the weight hundred in described acidifying solution Proportion by subtraction meter, iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium percentage by weight is 0.5～2%, Cortex cocois radicis Oleic acid diethyl amide percentage by weight is 1～4%, 2-(1-anilino-) benzyl-Ketohexamethylene weight hundred Proportion by subtraction is 0.5-2%.

Above-mentioned a kind of low permeability reservoir man-made fracture height oozes the preparation method of extreme difference low fingering noresidue acidifying solution, bag Include following steps:

S1, formula as described in any one of claim 1-6 carry out measuring of each composition；

S2, the water for industrial use measured is placed in politef reactor, adds helping of measuring while stirring Agent, stirs 5～10min；Add the acid solution measured, stir 5～10min；What addition measured carries liquid, Stirring 10～15min；Add the organic solvent measured, stir 5～10min；It is eventually adding the acidifying measured Granule, stirring 20～30min obtains acidifying solution.

The method have the advantages that

1. with common acidifying solution in low permeability reservoir man-made fracture de-plugging compared with, the liquid that carries of the present invention has The feature that water acidifying solution system viscosity entirety increases considerably is met, owing to blocking in man-made fracture in man-made fracture Mostly cause because of fouling, be just near reservoir water stream channel at fouling and clogging, therefore at blocking near certainty There is bigger high permeability formation or high flow conductivity, common acid liquid loss is relatively big, and fingering phenomenon is obvious, and acid solution is sent out Wave effective de-plugging limited use.Secondly in man-made fracture, blocking section is usually based on a blocking, and face blocks relatively Few, the acid solutions such as micelle is sour are poor due to wave making machine in crack, it is impossible to forming filter cake at wall, acid solution is same There is fingering phenomenon, the present invention blocks high bleed-through road, water-swellable by acidifying granule, reduces high (low) Permeability extreme difference effect and acid liquid loss effect, in promoting acid solution to enter man-made fracture, blocking interval solves Stifled, improve de-plugging efficiency in man-made fracture.

Acidifying solution the most of the present invention blocks up owing to chance water acidifying solution system viscosity entirety increases considerably and be acidified granule The dual-use function feature at high bleed-through road water-swellable of filling in makes acid solution filtration capacity in man-made fracture significantly drop Low, acid liquid loss amount is little, and acid solution has relatively low surface tension and interfacial tension simultaneously, at acidifying breaking block treatment After end, the acid solution quickly row of returning in hole can be made under low condition of formation pressure, reduce acidifying solution to reservoir Injury.In oil recovery process, in man-made fracture, crude oil makes the rapid viscosity reduction of acidifying solution, dissolves acidifying granule simultaneously, Make man-made fracture interior without any solid phase noresidue, reach the purpose to de-plugging quick in man-made fracture, improve Plugging removal effect in man-made fracture.

Detailed description of the invention

In order to make objects and advantages of the present invention clearer, below in conjunction with embodiment, the present invention is carried out Further describe.Should be appreciated that specific embodiment described herein only in order to explain the present invention, It is not intended to limit the present invention.

Embodiments provide a kind of low permeability reservoir man-made fracture height and ooze extreme difference low fingering noresidue acidifying Liquid, is prepared from by the raw material of following percentage by weight: organic solvent: 10-15%；Carry liquid: 8-12%； Acidifying granule: 5-8%；Acid solution；30-35%；Auxiliary agent: 2-8%；Surplus is water for industrial use.

Originally the surface tension and the interfacial tension result that are embodied as the acidifying solution test of gained are as shown in table 1, knot Fruit display acidifying solution surface tension is less than 20mN/m, and interfacial tension reaches 1 × 10-3mN/m.

The table of table 1 acidifying solution/interfacial tension result

Temperature/DEG C	Surface tension/mN/m	Interfacial tension/mN/m
			25	19.143	0.00235
60	19.036	0.00224
			80	19.027	0.00282

The chance water thickening feature of this acidifying solution being specifically embodied as gained is as described in Table 2.Result display acidifying After liquid meets the formation water of 10%, viscosity increases sharply about 10 times.

Table 2 acidifying solution adds formation water thickening result

Embodiment 1

A kind of low permeability reservoir man-made fracture height oozes extreme difference low fingering noresidue acidifying solution, by following percentage by weight Raw material be prepared from:

Organic solvent: 10-15% (wherein isopropanol: 5～7.5%；One in isooctanol or n-octyl alcohol or Several: 5～7.5%)；Carry liquid: 8-12% (the wherein double eicosyl Dimethyl Ammonium of chlorination: 0.5～2%； Distearyl amide ethyl glycidyl aliquat: 0.5～2%；N-carboxymethyl-N-hydroxyl-2-heptadecane Base imidazoline sodium salt: 1～5%；Sodium p-octadecyl toluene sulfonate, 2,5-dihydroxy-4-(1-methyl heptadecane Base) one or more in benzenesulfonic acid list sodium: 2～6%)；Acidifying granule: 5-8% (wherein 70-100 mesh Arabic gum: 2.5-4%；Tert butyl phenolic resin, 4-hydroxydiphenyl urea formaldehyde, terpene resin, N-methyl One or more in ketopyrrolidine: 2.5-4%.)；Acid solution: 30-35% (wherein in hydrochloric acid, nitric acid Plant or several: 15～17.5%；One or more in trifluoroacetic acid, ammonium acid fluoride, fluoboric acid: 10～ 15%；Chloroacetic acid, one or more in dichloroacetic acid, trichloroacetic acid, formic acid: 5～7.5%)；Help Agent: 2-8% (wherein iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium: 0.5～2%, cocinic acid Diglycollic amide: 1～4%, 2-(1-anilino-) benzyl-Ketohexamethylene: 0.5-2%)；Surplus is industry Use water.

Embodiment 2

S1, getting the raw materials ready, by accounting in acidifying solution based on percentage by weight, each component is got the raw materials ready by following weight: You Jirong Agent: 10-15% (wherein isopropanol: 5～7.5%；One or more in isooctanol or n-octyl alcohol: 5～7.5%)； Carry liquid: 8-12% (the wherein double eicosyl Dimethyl Ammonium of chlorination: 0.5～2%；Distearyl amide ethyl ring Oxygen quaternary ammonium chloride: 0.5～2%；N-carboxymethyl-N-hydroxyl-2-heptadecyl imidazole quinoline sodium salt: 1～ 5%；Sodium p-octadecyl toluene sulfonate, 2, in 5-dihydroxy-4-(1-methyl heptadecyl) benzenesulfonic acid list sodium One or more: 2～6%)；Acidifying granule: 5-8% (wherein 70-100 mesh arabic gum: 2.5-4%； One in tert butyl phenolic resin, 4-hydroxydiphenyl urea formaldehyde, terpene resin, N-Methyl pyrrolidone or Several: 2.5-4%.)；Acid solution: 30-35% (wherein one or more in hydrochloric acid, nitric acid: 15～17.5%； One or more in trifluoroacetic acid, ammonium acid fluoride, fluoboric acid: 10～15%；Chloroacetic acid, two chloroethenes One or more in acid, trichloroacetic acid, formic acid: 5～7.5%)；Auxiliary agent: 2-8% (wherein iodate N- (perfluoro-octanoyl amino) oxypropyl trimethyl ammonium: 0.5～2%, cocoanut oil diethan olamide: 1～4%, 2- (1-anilino-) benzyl-Ketohexamethylene: 0.5-2%)；Surplus is water for industrial use.

S2, elder generation add whole water for industrial uses, stirring at normal temperature in politef reactor；Add all Auxiliary agent (iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium, cocoanut oil diethan olamide, 2- (1-anilino-) benzyl-Ketohexamethylene), stir 5～10min；Add whole acid solution (hydrochloric acid, nitre One or more in acid, one or more in trifluoroacetic acid, ammonium acid fluoride, fluoboric acid, chloroacetic acid, One or more in dichloroacetic acid, trichloroacetic acid, formic acid), stir 5～10min；Add and all carry Liquid (the double eicosyl Dimethyl Ammonium of chlorination, distearyl amide ethyl glycidyl aliquat, N-carboxylic first Base-N-hydroxyl-2-heptadecyl imidazole quinoline sodium salt, sodium p-octadecyl toluene sulfonate, 2,5-dihydroxy-4-(1- Methyl heptadecyl) one or more in benzenesulfonic acid list sodium), stir 10～15min；Add and all have Machine solvent (one or more in isopropanol, isooctanol or n-octyl alcohol), stirs 5～10min；Finally add Enter all to be acidified granule (70-100 mesh arabic gum, tert butyl phenolic resin, 4-hydroxydiphenyl urea formaldehyde, One or more in terpene resin, N-Methyl pyrrolidone) stirring 20～30min；Produce hypotonic storage Layer man-made fracture height oozes extreme difference low fingering noresidue acidifying solution product.

Embodiment 3

According to accounting for percentage by weight meter in acidifying solution, first add in politef reactor and account in acidifying solution The water for industrial use of percentage by weight meter 42.5% weight portion, room temperature (25 DEG C) stirs, adds 0.5% iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium, 1% cocoanut oil diethan olamide, 1%2-(1-aniline Base) benzyl-Ketohexamethylene, stirs 5min；Add 10% hydrochloric acid, 5% nitric acid, 5% trifluoroacetic acid, 5% fluorine Boric acid, 2.5% chloroacetic acid, 2.5% dichloroacetic acid, stir 10min；Add the double eicosyl two of 1% chlorination Ammonium methyl, 2% distearyl amide ethyl glycidyl aliquat, 3%N-carboxymethyl-N-hydroxyl-2-17 Alkyl imidazoline sodium salt, 2% sodium p-octadecyl toluene sulfonate, 2%2,5-dihydroxy-4-(1-methyl heptadecane Base) benzenesulfonic acid list sodium, stirs 10min；Add 5% isopropanol, 5% isooctanol, stir 5min；Finally Add 2.5%70-100 mesh arabic gum, 1% tert butyl phenolic resin, 1% 4-hydroxydiphenyl urea formaldehyde, 0.5% Terpene resin, stirs 20min；Produce low permeability reservoir man-made fracture height and ooze extreme difference low fingering noresidue acidifying Liquid product.

Embodiment 4

According to accounting for percentage by weight meter in acidifying solution, first add in politef reactor and account in acidifying solution The water for industrial use of percentage by weight meter 31.5% weight portion, room temperature (25 DEG C) stirs, adds 1% iodate N- (perfluoro-octanoyl amino) oxypropyl trimethyl ammonium, 2%2-(1-anilino-) benzyl-Ketohexamethylene, 2% Cortex cocois radicis Oleic acid diethyl amide, stirs 7.5min；Add 7.5% hydrochloric acid, 6% nitric acid, 5% trifluoroacetic acid, 2.5% Ammonium acid fluoride, 5% fluoboric acid, 1% chloroacetic acid, 2% dichloroacetic acid, 2% trichloroacetic acid, 2% formic acid, stir Mix 7.5min；Add the double eicosyl Dimethyl Ammonium of 1.5% chlorination, 1.5% distearyl amide ethyl epoxy third Base aliquat, 3%N-carboxymethyl-N-hydroxyl-2-heptadecyl imidazole quinoline sodium salt, 2% octadecyl toluene Sodium sulfonate, 1.5%2,5-dihydroxy-4-(1-methyl heptadecyl) benzenesulfonic acid list sodium, stir 12.5min； Add 6% isopropanol, 3% isooctanol, 4% n-octyl alcohol, stir 7.5min；It is eventually adding 3%70-100 mesh Arabic gum, 2% tert butyl phenolic resin, 1% terpene resin, 1%N-methyl pyrrolidone, stir 25min； Produce low permeability reservoir man-made fracture height and ooze extreme difference low fingering noresidue acidifying solution product.

Embodiment 5

According to accounting for percentage by weight meter in acidifying solution, first add in politef reactor and account in acidifying solution The water for industrial use of percentage by weight meter 22% weight portion, room temperature (25 DEG C) stirs, and adds 4% iodate N-(complete Fluorine decoyl amino) oxypropyl trimethyl ammonium, 4%2-(1-anilino-) benzyl-Ketohexamethylene, stir 10min； Add 5% hydrochloric acid, 7.5% nitric acid, 3% trifluoroacetic acid, 8% ammonium acid fluoride, 4% fluoboric acid, 2.5% 1 chloroethene Acid, 2.5% dichloroacetic acid, 2.5% formic acid, stir 5min；Add the double eicosyl Dimethyl Ammonium of 2% chlorination, 2% distearyl amide ethyl glycidyl aliquat, 5%N-carboxymethyl-N-hydroxyl-2-heptadecyl imidazole Quinoline sodium salt, 3%2,5-dihydroxy-4-(1-methyl heptadecyl) benzenesulfonic acid list sodium, stir 15min；Add Enter 7.5% isopropanol, 2.5% isooctanol, 5% n-octyl alcohol, stir 10min；It is eventually adding 4%70-100 Mesh arabic gum, 1% tert butyl phenolic resin, 1% 4-hydroxydiphenyl urea formaldehyde, 1% terpene resin, 1%N- Methyl pyrrolidone, stirs 30min；Produce low permeability reservoir man-made fracture height and ooze extreme difference low fingering noresidue Acidifying solution product.

The above is only the preferred embodiment of the present invention, it is noted that common for the art For technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, These improvements and modifications also should be regarded as protection scope of the present invention.

Claims (7)

1. a low permeability reservoir man-made fracture height oozes extreme difference low fingering noresidue acidifying solution, it is characterised in that It is prepared from by the raw material of following percentage by weight:

Organic solvent 10-15%；Carry liquid 8-12%；Acidifying granule 5-8%；Acid solution 30-35%；Auxiliary agent 2-8%； Surplus water for industrial use.

A kind of low permeability reservoir man-made fracture height the most according to claim 1 oozes extreme difference low fingering noresidue Acidifying solution, it is characterised in that described organic solvent is by the one in isopropanol, isooctanol or n-octyl alcohol or two Planting composition, in terms of the percentage by weight in described acidifying solution, isopropanol percentage by weight is 5～7.5%； The percentage by weight of isooctanol, n-octyl alcohol or isooctanol and n-octyl alcohol mixture is 5～7.5%.

A kind of low permeability reservoir man-made fracture height the most according to claim 1 oozes extreme difference low fingering noresidue Acidifying solution, it is characterised in that described in carry liquid and be made up of component A and B component, component A is by accounting for acidifying solution Percentage by weight is the double eicosyl Dimethyl Ammonium of chlorination of 0.5～2%, and accounting for acidifying solution percentage by weight is 0.5～the distearyl amide ethyl glycidyl aliquat of 2%, account for acidifying solution percentage by weight be 1～ The composition N-carboxymethyl-N-hydroxyl-2-heptadecyl imidazole quinoline sodium salt of 5%；B component is by accounting for acidifying solution weight hundred Proportion by subtraction be calculated as 2～the sodium p-octadecyl toluene sulfonate of 6%, 2,5-dihydroxy-4-(1-methyl heptadecyl) One or more in benzenesulfonic acid list sodium.

A kind of low permeability reservoir man-made fracture height the most according to claim 1 oozes extreme difference low fingering noresidue Acidifying solution, it is characterised in that described acidifying granule is mixed by the raw material of following percentage by weight: 70-100 Mesh arabic gum 50%, tert butyl phenolic resin, 4-hydroxydiphenyl urea formaldehyde, terpene resin, N-methyl One or more in ketopyrrolidine 50%.

A kind of low permeability reservoir man-made fracture height the most according to claim 1 oozes extreme difference low fingering noresidue Acidifying solution, it is characterised in that described acid solution is by component C, D component and component E in mass ratio 3: 2: 1 Mixing gained, component C is one or more in hydrochloric acid, nitric acid；D component is trifluoroacetic acid, fluohydric acid gas One or more in ammonium, fluoboric acid；Component E is chloroacetic acid, dichloroacetic acid, trichloroacetic acid, formic acid In one or more.

A kind of low permeability reservoir man-made fracture height the most according to claim 1 oozes extreme difference low fingering noresidue Acidifying solution, it is characterised in that described auxiliary agent by iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium, Cocoanut oil diethan olamide, 2-(1-anilino-) benzyl-Ketohexamethylene composition；With at described acidifying solution In percentage by weight meter, iodate N-(perfluoro-octanoyl amino) oxypropyl trimethyl ammonium percentage by weight be 0.5～ 2%, cocoanut oil diethan olamide percentage by weight is 1～4%, 2-(1-anilino-) benzyl-hexamethylene Ketone percentage by weight is 0.5-2%.

7. low permeability reservoir man-made fracture height oozes a preparation method for extreme difference low fingering noresidue acidifying solution, its It is characterised by, comprises the steps:

S1, formula as described in any one of claim 1-6 carry out measuring of each composition；

S2, the water for industrial use measured is placed in politef reactor, adds helping of measuring while stirring Agent, stirs 5～10min；Add the acid solution measured, stir 5～10min；What addition measured carries liquid, Stirring 10～15min；Add the organic solvent measured, stir 5～10min；It is eventually adding the acidifying measured Granule, stirring 20～30min obtains acidifying solution.