CN108611085A - One kind being directed to the low physical property section acid liquid for acid fracturing of SAGD wells - Google Patents
One kind being directed to the low physical property section acid liquid for acid fracturing of SAGD wells Download PDFInfo
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- CN108611085A CN108611085A CN201810494359.7A CN201810494359A CN108611085A CN 108611085 A CN108611085 A CN 108611085A CN 201810494359 A CN201810494359 A CN 201810494359A CN 108611085 A CN108611085 A CN 108611085A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—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
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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Abstract
The invention discloses one kind for the problem that the low physical property section acid liquid for acid fracturing of SAGD wells, solves existing acid solution and prevents acid-sensitive poor performance.Fluoboric acid 4 ~ 5% is specifically included, hydrochloric acid 3 ~ 4%, acetic acid 2 ~ 4%, polyphosphoric acids 1 ~ 2%, clay stabilizer 0.5 ~ 1%, ferrous stability 1 ~ 1.5%, calcium ion stabilizer 1 ~ 1.5%, acid sludge inhibitor 1 ~ 1.5%, corrosion inhibiter 1.5 ~ 2%, ethyl alcohol 1.5 ~ 2%, surplus is water.After implementing acid fracturing using acid solution of the present invention, acid solution can carry out corrosion perpendicular to sides of fracture in face of low physical property section under gravity, prevent the generation of acid-sensitive phenomenon and the generation of acid sludge, improve low physical property section percolation ability, be conducive to the expanding area for expanding vapor chamber.During steam injection later, steam enters payzone through too low physical property section, reduces payzone viscosity of crude, and more crude oil is made to enter extraction well shaft, increases oil well output.
Description
Technical field
In the method for using steam assisted gravity drainage to recover the oil the present invention relates to field of oil development, to low physical property section
The acid solution used when being acidified.
Background technology
Steam assisted gravity drainage（Abbreviation SAGD）Be it is a kind of by steam from the horizontal production well near oil reservoir bottom
A bite straight well or a bite horizontal well of top inject the horizontal well of oil reservoir, the crude oil heated and steam condensate from oil reservoir bottom
The oil production method of output has high oil recovery ability, high gas oil ratio, higher ultimate recovery and reduces inter-well interference, avoids
Logical advantage is altered between too early well.
When, there are when low physical property section, vapor chamber can not often extend downwards, seriously affect and adopt between gas injection well and producing well
Oily effect, at this time common reservoir reconstruction measure are acidified to low physical property section.
Acidization is that acid solution is injected into hyposmosis area, and after acidified damage level well section, well may be implemented
Permeability around wall is uniformly distributed, and is finally realized uniform de-plugging and is improved oil field.Acid fracturing processing is injected firstly the need of by acid solution
Into oil well, and ensure that acid solution is uniformly distributed in oil well.The factor for influencing acidification effect includes mainly acidification region
Layer physical property, the length of well section, reservoir properties and its variation, wellbore construction difference and gravity etc..After acid solution enters reservoir
It reacts with the acid sensitivity mineral in reservoir, precipitation may be will produce or releases particle, reservoir permeability is made to decline, i.e., it is sour
Quick phenomenon.Acid solution may also generate gelatinous precipitate with the colloid in crude oil, pitch qualitative response, to block stratum.So acidification
Before anti-acid-sensitive and acid sludge measure is carried out according to stratum rock behavio(u)r.
Common acid solution is mud acid（10%HCl+3%~5%HF）Or fluoboric acid（10%HCl+3%~5%HBF4）System, it is slow to imitate
Fruit is poor, and acid solution causes clay particle to be migrated in the earth formation after entering acid-sensitive stratum, blocks hole throat, stratum is caused to permeate
Degradation.
Invention content
In view of this, the present invention, which provides one kind, being directed to the low physical property section acid liquid for acid fracturing of SAGD wells, existing acid solution acid-proof is solved
The problem of quick poor performance.
For achieving the above object, provided by the invention to be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, including fluorine boron
Acid, hydrochloric acid, acetic acid, polyphosphoric acids, clay stabilizer, ferrous stability, calcium ion stabilizer, acid sludge inhibitor, corrosion inhibiter
And ethyl alcohol.
Preferably, the clay stabilizer is by propenyl polyoxyethylene ether according to weight ratio：Glycerine：Fulvic acid
Potassium：Lauryl sodium sulfate：Acrylate：Methylbenzene e pioic acid methyl ester：Aluminum sulfate=3:13:4:7:8:6:The mixed liquor of 4 compositions
Body.
Preferably, the ferrous stability is by citric acid according to weight ratio：EDETATE SODIUM=5:1 composition mixes
Close solid.
Preferably, the calcium ion stabilizer is by sodium tripolyphosphate according to weight ratio：Aminotrimethylenephosphonic acid
ATMP=1:The mixture of 3 compositions.
Preferably, the acid sludge inhibitor is butyl glycol ether.
Preferably, the corrosion inhibiter is by sodium tripolyphosphate according to weight ratio：Furfural：Cinnamic acid：Imidazoline=1:1:2:
The mixing liquid of 1 composition.
Preferably, described to be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is calculated according to mass percent, component difference
For：
Fluoboric acid 4 ~ 5%；
Hydrochloric acid 3 ~ 4%；
Acetic acid 2 ~ 4%；
Polyphosphoric acids 1 ~ 2%；
Clay stabilizer 0.5 ~ 1%；
Ferrous stability 1 ~ 1.5%；
Calcium ion stabilizer 1 ~ 1.5%；
Acid sludge inhibitor 1 ~ 1.5%；
Corrosion inhibiter 1.5 ~ 2%；
Ethyl alcohol 1.5 ~ 2%；
Surplus is water.
The above-mentioned preparation method for the low physical property section acid liquid for acid fracturing of SAGD wells：The component is uniformly mixed according to formula
.
The above-mentioned application method for the low physical property section acid liquid for acid fracturing of SAGD wells：It is identical as the application method of common acid solution,
It specifically first will soften stratum in acid solution injection stratum, then injecting a certain amount of fracturing fluid and proppant seam, finally
Reinject after acid solution closing well for 24 hours ~ 48h, so that acid solution is further reacted with stratum, the low physical property section of corrosion improves oozing for low physical property section
Permeability energy.
The principle explanation of the low antiacid quick performance of physical property section acid liquid for acid fracturing of SAGD wells of the present invention：
In the acid solution composition of the present invention, fluoboric acid has the function of corrosion clay mineral and stablizes rock matrix；Acetic acid
Effect is to play the role of slow corrosion, while having the effect of that iron ion is inhibited to generate, and slow corrosion can reduce acid
Quick generation, and it is to prevent acid sludge from generating to inhibit iron ion mainly；The effect of polyphosphoric acids is can gradually to be divided by multiple ionization
Separate out H+The acidity of acid solution is kept, the precipitation of fluoride can also be inhibited, so the acid-sensitive reaction on stratum can be reduced；Clay is steady
Determining that agent has the function of being capable of good ground CLAY MINERALS AND THEIR SIGNIFICANCE；The effect of ferrous stability is to reduce iron ion in the liquid of stratum
Concentration, reduce iron concentration be acid-sensitive reaction in order to prevent generation；Calcium ion stabilizer has good ground skeleton, with
And inhibit the effect of calcium ions precipitate；Acid sludge inhibitor can inhibit acid solution to be mixed to form with viscosity higher with formation crude oil
Mixture block formation pore；The effect of ethyl alcohol is to promote the intersolubility of acid solution and additive.
Beneficial effects of the present invention：Using acid solution of the present invention implement acid fracturing after, acid solution can under gravity perpendicular to
Sides of fracture carries out corrosion in face of low physical property section, prevents the generation of acid-sensitive phenomenon and the generation of acid sludge, improves low physical property section seepage flow energy
Power is conducive to the expanding area for expanding vapor chamber.During steam injection later, steam enters production through too low physical property section
Layer reduces payzone viscosity of crude, and more crude oil is made to enter extraction well shaft, increases oil well output.
Specific implementation mode
Below based on embodiment, present invention is described, but it is worth noting that, the present invention is not limited to these realities
Apply example.Below to the present invention datail description in, it is detailed to describe some specific detail sections.However, for not detailed
The part described to the greatest extent, those skilled in the art can also understand the present invention completely.
Experimental example 1
1, acid solution is prepared：
By 5% fluoboric acid, 4% hydrochloric acid, 4% acetic acid, 2% 4 polyphosphoric acid, 1% clay stabilizer, 1.5% ferrous stability, 1.5% calcium
Ion stabilizer, 1.5% acid sludge inhibitor, 2% corrosion inhibiter, 1.5% ethyl alcohol, surplus are water, stir 20min, are uniformly mixed, obtain
Acid solution.
2,5 blocks of low physical property section rock cores are taken, regular mud acid and above-mentioned acid solution is used to carry out rock core anatonosis experiment respectively.Before acidification
Core permeability is as shown in table 1 below afterwards：
Application examples 1
（1）, prepare acid solution：
By 5% fluoboric acid, 4% hydrochloric acid, 4% acetic acid, 2% 4 polyphosphoric acid, 1% clay stabilizer, 1.5% ferrous stability, 1.5% calcium
Ion stabilizer, 1.5% acid sludge inhibitor, 2% corrosion inhibiter, 2% ethyl alcohol, surplus are water, stir 20min, are uniformly mixed, obtain acid
Liquid.
（2）, the condition by acid solution with bottom pressure higher than formation fracture pressure inject oil well, formation fracture pressure is
35MPa, well depth 1200m, acid solution relative density are 1.02, ensure injection pressure in 23MPa, low physical property section permeability 250 × 10-3
μm2, oil production 40m before acid fracturing3/ d, well head is with 5m3The pump of the speed injection of/min such as the following table 2 notes program, until acid solution has been injected
Finish.
（3）Closing well 36 hours；
（4）The residual acid system of the row of returning after closing well；
（5）Test production.
After carrying out acid fracturing to the low physical property section of target well, low physical property section permeability is by 250 × 10-3μm2Increase to 400 ×
10-3μm2, permeance property increases considerably, and after steam soak gravity assists the displacement of reservoir oil, more steam can pass through low physical property section
It enters in Heavy Oil Reservoir, viscous crude melts under the action of steam and gravity is relied on to enter shaft bottom, and oil production increases 15m3/d。
Application examples 2
（1）, prepare acid solution：
By 5% fluoboric acid, 4% hydrochloric acid, 4% acetic acid, 2% 4 polyphosphoric acid, 1% clay stabilizer, 1.5% ferrous stability, 1.5% calcium
Ion stabilizer, 1.5% acid sludge inhibitor, 2% corrosion inhibiter, 2% ethyl alcohol, surplus are water, stir 20min, are uniformly mixed, obtain acid
Liquid.
（2）By acid solution with bottom pressure higher than oil well is injected under conditions of formation fracture pressure, formation fracture pressure is
30MPa, well depth 1000m, acid solution relative density are 1.02, ensure injection pressure in 20MPa, low physical property section permeability 300 × 10-3
μm2, oil production 37m before acid fracturing3/ d, well head is with 3.8m3The pump of the speed injection of/min such as table 3 notes program, until acid solution has been injected
Finish.
（3）Closing well 40 hours；
（4）The residual acid system of the row of returning after closing well；
（5）Test production.
After carrying out acid fracturing to the low physical property section of target well, low physical property section permeability is by 300 × 10-3μm2Increase to 400 ×
10-3μm2, low physical property section percolation ability is enhanced, after steam soak gravity assists the displacement of reservoir oil, more steam can pass through low object
Property section enter in Heavy Oil Reservoir, viscous crude viscosity under the action of steam reduces and gravity is relied on to enter shaft bottom, and oil production increases
Add 12m3/d。
Embodiment described above is only to express embodiments of the present invention, the description thereof is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that those skilled in the art,
Under the premise of not departing from present inventive concept, several deformations, same replacement can also be made, improved etc., these belong to the present invention
Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. being directed to the low physical property section acid liquid for acid fracturing of SAGD wells, which is characterized in that including following component：
Fluoboric acid, hydrochloric acid, acetic acid, polyphosphoric acids, clay stabilizer, ferrous stability, calcium ion stabilizer, acid sludge inhibit
Agent, corrosion inhibiter and ethyl alcohol.
2. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is characterised in that：
The clay stabilizer is by propenyl polyoxyethylene ether according to weight ratio：Glycerine：Potassium fulvate：Dodecyl sulphur
Sour sodium：Acrylate：Methylbenzene e pioic acid methyl ester：Aluminum sulfate=3:13:4:7:8:6:The mixing liquid of 4 compositions.
3. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is characterised in that：
The ferrous stability is by citric acid according to weight ratio：EDETATE SODIUM=5:The hybrid solid of 1 composition.
4. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is characterised in that：
The calcium ion stabilizer is by sodium tripolyphosphate according to weight ratio：Aminotrimethylenephosphonic acid=1:The mixing of 3 compositions
Object.
5. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is characterised in that：
The acid sludge inhibitor is butyl glycol ether.
6. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, it is characterised in that：
The corrosion inhibiter is by sodium tripolyphosphate according to weight ratio：Furfural：Cinnamic acid：Imidazoline=1:1:2:The mixing of 1 composition
Liquid.
7. according to claim 1 be directed to the low physical property section acid liquid for acid fracturing of SAGD wells, which is characterized in that the component contains
Amount, calculates, respectively according to mass percentage：
Fluoboric acid 4 ~ 5%；
Hydrochloric acid 3 ~ 4%；
Acetic acid 2 ~ 4%；
Polyphosphoric acids 1 ~ 2%；
Clay stabilizer 0.5 ~ 1%；
Ferrous stability 1 ~ 1.5%；
Calcium ion stabilizer 1 ~ 1.5%；
Acid sludge inhibitor 1 ~ 1.5%；
Corrosion inhibiter 1.5 ~ 2%；
Ethyl alcohol 1.5 ~ 2%；
Surplus is water.
8. being directed to the low physical property section acid liquid for acid fracturing of SAGD wells according to any in claim 1-7, it is characterised in that：
The polyphosphoric acids is four polyphosphoric acids.
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| CN201810494359.7A CN108611085B (en) | 2018-05-22 | 2018-05-22 | Acid liquor for acid fracturing of low physical property section of SAGD well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505384A (en) * | 2022-11-23 | 2022-12-23 | 中石化西南石油工程有限公司 | High-temperature iron ion stabilizer for acidizing and fracturing fluid |
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