CN110028946A - Solid acid rod for water injection well and preparation and injection method thereof - Google Patents
Solid acid rod for water injection well and preparation and injection method thereof Download PDFInfo
- Publication number
- CN110028946A CN110028946A CN201910239134.1A CN201910239134A CN110028946A CN 110028946 A CN110028946 A CN 110028946A CN 201910239134 A CN201910239134 A CN 201910239134A CN 110028946 A CN110028946 A CN 110028946A
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- China
- Prior art keywords
- acid
- water injection
- solid acid
- rod
- injection well
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- 239000011973 solid acid Substances 0.000 title claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000002347 injection Methods 0.000 title claims abstract description 86
- 239000007924 injection Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 113
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims abstract description 64
- JSYPRLVDJYQMAI-ODZAUARKSA-N (z)-but-2-enedioic acid;prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)\C=C/C(O)=O JSYPRLVDJYQMAI-ODZAUARKSA-N 0.000 claims abstract description 59
- 230000007797 corrosion Effects 0.000 claims abstract description 58
- 238000005260 corrosion Methods 0.000 claims abstract description 58
- 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 49
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims abstract description 49
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 49
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 49
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 49
- 239000011734 sodium Substances 0.000 claims abstract description 49
- 239000004711 α-olefin Substances 0.000 claims abstract description 48
- 239000000839 emulsion Substances 0.000 claims abstract description 46
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 40
- 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 description 72
- CAAMSDWKXXPUJR-UHFFFAOYSA-N 3,5-dihydro-4H-imidazol-4-one Chemical compound O=C1CNC=N1 CAAMSDWKXXPUJR-UHFFFAOYSA-N 0.000 claims description 48
- QYTBWVFCSVDTEC-UHFFFAOYSA-N azane;iron Chemical compound N.[Fe] QYTBWVFCSVDTEC-UHFFFAOYSA-N 0.000 claims description 41
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 17
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 17
- 239000011976 maleic acid Substances 0.000 claims description 17
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 239000005864 Sulphur Substances 0.000 claims description 8
- 150000001336 alkenes Chemical class 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- -1 pentaacetic acid iron ammonia salt Chemical compound 0.000 claims description 6
- 239000011541 reaction mixture Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 229940075065 polyvinyl acetate Drugs 0.000 claims 5
- 229920000642 polymer Polymers 0.000 claims 1
- HVWZAHQSHGZHRW-UHFFFAOYSA-N [NH4+].[NH4+].[NH4+].[NH4+].[NH4+].CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O.NCCNCCN Chemical compound [NH4+].[NH4+].[NH4+].[NH4+].[NH4+].CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O.NCCNCCN HVWZAHQSHGZHRW-UHFFFAOYSA-N 0.000 abstract 1
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- 229940049964 oleate Drugs 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 42
- 239000002253 acid Substances 0.000 description 19
- 150000002148 esters Chemical class 0.000 description 11
- 238000011049 filling Methods 0.000 description 7
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000006210 lotion Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 4
- 230000020477 pH reduction Effects 0.000 description 4
- 239000013522 chelant Substances 0.000 description 3
- 239000002738 chelating agent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000000502 dialysis Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920006243 acrylic copolymer Polymers 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical class N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 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
-
- 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
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
-
- 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
- C09K8/725—Compositions containing polymers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a solid acid rod for a water injection well and a preparation and injection method thereof, wherein the solid acid rod is prepared from 25-35 wt% of maleic acid-acrylic acid copolymer, 10-20 wt% of ethyl acetate, 10-18 wt% of water-soluble imidazoline oleate corrosion inhibitor, 5-12 wt% of α -olefin sodium sulfonate, 20-30 wt% of ferric ammonium diethylenetriamine pentaacetate and 5-15 wt% of polyvinyl acetate emulsion, and the solid acid rod is cylindrical in shape.
Description
Technical field
The invention belongs to water injection well in oil fields Acidizing Technology field more particularly to a kind of water injection well solid acid rod and its preparations
And choosing and selling method.
Background technique
As continually developing for oil field fills the water due to being influenced by reservoir properties, injection water quality and field management factor
The well problem of shorting becomes increasingly conspicuous, and causes reservoir energy that cannot be replenished in time, influences Development Response of Oilfield, in hypotonic, Oil in Super-low Permeability
Block just seems more prominent.Problem is shorted for water injection well at present, mainly uses circulation well cleanup with pressure, acidification and small-sized acid fracturing
Based on, wherein acidification accounting is more than 80%, becomes oil field and short the most important means of water well treatment.When filling the water well acidizing, commonly
Acid fluid system mainly has the liquid systems such as mud acid, hydrofluoric acid and retarded acid, needs in the transport and storage of acid solution dedicated
Acid tank truck, in addition, when such as mud acid is acidified there is also well discharge water pressure release, rise and be acidified tubing string under former tubing string and raffinate returns row etc. and applies
Work process exists and accounts for the problems such as well time is long, and acidizing process is complicated, large labor intensity, and under the conditions of new Environmental Law, the row of returning
The processing of liquid, which is also one, cannot be neglected factor.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, a kind of water injection well solid acid rod and its system are provided
Standby and choosing and selling method overcomes in the prior art 1: needing dedicated acid tank truck when the transport and storage of acid solution；2: mud acid etc.
When acidification there is also well discharge water pressure release, rise and be acidified tubing string under former tubing string and raffinate returns the construction process such as row, exist and account for the well time
Long, acidizing process is complicated, large labor intensity；3: returning drain and need the problems such as handling.
In order to solve technical problem, the technical scheme is that a kind of water injection well solid acid rod, the solid acid rod
By maleic acid-acrylic acid copolymer, ethyl acetate, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylenetriamine
Pentaacetic acid iron ammonia salt and polyvinyl acetate emulsion are made, wherein the weight percentage of each component are as follows: maleic-acrylic acid copolymerization
Object 25% ~ 35%, ethyl acetate 10% ~ 20%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, two
Ethylene pentaacetic acid iron ammonia salt 20% ~ 30%, polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate
12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia
Salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%,
Water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sodium sulfonate 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate
Lotion 10%.
Preferably, the maleic acid-acrylic acid copolymer is made of maleic acid and acrylic acid copolymer, wherein maleic acid and third
The molar ratio of olefin(e) acid is 1:5 ~ 5:1.
Preferably, the solid acid rod shape is white cylindrical type, and wherein the diameter of cylinder type solid acid stick is 50mm, high
Degree is 300mm, and pH value is 3 ~ 4, and density is 1.8 ~ 2g/cm3。
Preferably, a kind of preparation method of water injection well solid acid rod as described above, comprising the following steps:
Step 1) prepares maleic acid-acrylic acid copolymer, then by 25% ~ 35% maleic acid-acrylic acid copolymer, 10% ~ 20%
Ethyl acetate, 10% ~ 18% water-soluble oleic imidazolinone corrosion inhibiter, 5% ~ 12% alpha-olefin sodium sulfonate, 20% ~ 30% diethyl
The mixing of alkene pentaacetic acid iron ammonia salt, and stir evenly, be heated to 60 DEG C and continue 4 hours；
5% ~ 15% polyvinyl acetate emulsion is added in the reaction mixture of step 1) by step 2, and is stirred evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), and being then cooled to room temperature can be obtained water injection well solid acid
Stick.
Preferably, a kind of choosing and selling method of any one water injection well solid acid rod as above, the choosing and selling method is logical
Switching wellhead of water injection well process is crossed, 15 ~ 20 water injection well solid acid rods are directly bet from the test valve at the top of water injection well, are leaned on
Its self weight falls into shaft bottom, as water injection well is gradually dissolved with solid acid rod, can release the blocking of near wellbore zone, be spaced 10 ~ 60 days
Water injection well solid acid rod is bet again.
Compared with the existing technology, the present invention has the advantages that
(1) solid acid rod of the present invention is by maleic acid-acrylic acid copolymer, ethyl acetate, water-soluble oleic imidazolinone corrosion inhibiter, α-
Alkene sulfonic acid sodium, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion are made, and each component collocation is reasonable, maleic acid-
Acrylic copolymer is antisludging agent, and thermal stability is good, can be used under the conditions of 300 DEG C of high temperature hostiles, and ethyl acetate, can in acidity
It is hydrolyzed into acetic acid and ethyl alcohol, water-soluble oleic imidazolinone corrosion inhibiter makes sour stick have preferable corrosion mitigating effect, alpha-olefin sodium sulfonate
For reducing oil water interfacial tension, dissolved sour stick substance dialysis diadochy, diethylene triamine pentacetic acid (DTPA) iron ammonia salt are improved
For chelating agent, for forming stable chelate with metal ion, polyvinyl acetate emulsion is adhesive, solid acid rod of the present invention
Acidizing effect is good, effectively corrosion dirt, reduction water filling well pressure can improve water injection well daily water-injection rate, meet water injection well injection allocation and want
It asks；
(2) solid acid rod preparation method of the present invention is that each component is heated to 60 DEG C after mixing, and it is poly- to be subsequently added into adhesive
Acetate emulsion is formed by curing using rodlike compacting tool set after mixing, and solid acid rod preparation method of the present invention is simple, easily
Operation, does not generate any waste material, and the solid acid rod heatproof prepared is up to 75 DEG C, and formation pore is not destroyed after use
Structure solves the security risk of the acid solution transport and roping of existing liquid convenient for storage and roping；
(3) solid acid rod choosing and selling method of the present invention is simple, it is only necessary to switch wellhead of water injection well process, test valve is direct from top
Stake, is fallen near shaft bottom using self weight, is gradually dissolved with mixing with injection water, effectively to the dirt of pit shaft and near wellbore zone
Corrosion is carried out, de-plugging is played the role of, and by the pressure change of observation water injection well, intermittent bets solid acid rod, can make to fill the water
Well fills the water steadily in the long term, and acidizing process of the present invention is simple, acidification and water filling while carrying out, and does not need Zhan Jing, labor intensity very little,
And do not return drain；
(4) solid acid rod of the present invention is small to the corrosion rate of tubing string, only 0.08g/m2H reaches industry primary standard, can be true
Water injection string will not be corroded during protecting solid acid rod stake；After solid acid rod of the present invention enters stratum, can slow release, acid
Change the time up to 6 hours or more, is able to achieve reservoir removing clog in deep reservoir.
Detailed description of the invention
Water injection pressure variation diagram before and after Fig. 1,1 water injection well of Application Example stake solid acid rod.
Specific embodiment
The specific embodiment of the invention is described below with reference to embodiment:
It should be noted that structure, ratio, size etc. that this specification is illustrated, only to cooperate specification revealed
Content is not intended to limit the invention enforceable qualifications, Ren Hejie so that those skilled in the art understands and reads
The modification of structure, the change of proportionate relationship or the adjustment of size are not influencing the effect of present invention can be generated and can reach
Under purpose, should all still it fall in the range of disclosed technology contents can cover.
Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, also
Only being illustrated convenient for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in nothing
Under essence change technology contents, when being also considered as the enforceable scope of the present invention.
Maleic acid of the present invention, acrylic acid, ethyl acetate, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate,
Diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion are commercial products.
Rodlike compacting tool set of the present invention, wellhead of water injection well process pipeline be the prior art.
A kind of wherein antisludging agent of maleic acid-acrylic acid copolymer, thermal stability is good, can be under the conditions of 300 DEG C of high temperature hostiles
It uses.
Wherein ethyl acetate molecular formula is C4H8O2, in acidity, hydrolyzable at acetic acid and ethyl alcohol, can effectively by pit shaft and
The dirt of near wellbore zone be acidified and corrosion.
Wherein water-soluble oleic imidazolinone corrosion inhibiter makes solid acid rod have preferable rust inhibition, it can be ensured that sour stick was bet
Water injection string will not be corroded in journey.
Wherein alpha-olefin sodium sulfonate improves dissolved sour stick substance dialysis displacement energy for reducing oil water interfacial tension
Power.
Wherein diethylene triamine pentacetic acid (DTPA) iron ammonia salt is chelating agent, stable for being formed with the metal ion in water injection well
Chelate.
Wherein polyvinyl acetate emulsion is adhesive, for bonding solid acid rod each component, is formed convenient for sour stick,
The decomposition rate for also contributing to reducing solid acid rod simultaneously, can make its slow release, increase acidificatoin time, realize reservoir deep solution
It is stifled.
The percentage composition of following embodiment is weight percentage, and the weight of solid acid rod obtained is 100kg.
Embodiment 1
The invention discloses a kind of water injection well solid acid rods, and the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid second
Ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion
It is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%, water
Dissolubility oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 30%,
Polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Embodiment 2
The invention discloses a kind of water injection well solid acid rods, and the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid second
Ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion
It is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%, water
Dissolubility oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 30%,
Polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate
12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia
Salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%,
Water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sodium sulfonate 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate
Lotion 10%.
Embodiment 3
The invention discloses a kind of water injection well solid acid rods, and the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid second
Ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion
It is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%, water
Dissolubility oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 30%,
Polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate
12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia
Salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%,
Water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sodium sulfonate 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate
Lotion 10%.
Preferably, the maleic acid-acrylic acid copolymer is made of maleic acid and acrylic acid copolymer, wherein maleic acid and third
The molar ratio of olefin(e) acid is 1:5 ~ 5:1.
Preferably, the solid acid rod shape is white cylindrical type, and wherein the diameter of cylinder type solid acid stick is 50mm, high
Degree is 300mm, and pH value is 3 ~ 4, and density is 1.8 ~ 2g/cm3。
Embodiment 4
The invention discloses a kind of water injection well solid acid rods, and the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid second
Ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion
It is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%, water
Dissolubility oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 30%,
Polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate
12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia
Salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%,
Water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sodium sulfonate 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate
Lotion 10%.
Preferably, the maleic acid-acrylic acid copolymer is made of maleic acid and acrylic acid copolymer, wherein maleic acid and third
The molar ratio of olefin(e) acid is 1:5 ~ 5:1.
Preferably, the solid acid rod shape is white cylindrical type, and wherein the diameter of cylinder type solid acid stick is 50mm, high
Degree is 300mm, and pH value is 3 ~ 4, and density is 1.8 ~ 2g/cm3.
Preferably, a kind of preparation method of water injection well solid acid rod as described above, comprising the following steps:
Step 1) prepares maleic acid-acrylic acid copolymer, then by 25% ~ 35% maleic acid-acrylic acid copolymer, 10% ~ 20%
Ethyl acetate, 10% ~ 18% water-soluble oleic imidazolinone corrosion inhibiter, 5% ~ 12% alpha-olefin sodium sulfonate, 20% ~ 30% diethyl
The mixing of alkene pentaacetic acid iron ammonia salt, and stir evenly, be heated to 60 DEG C and continue 4 hours；
5% ~ 15% polyvinyl acetate emulsion is added in the reaction mixture of step 1) by step 2, and is stirred evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 5
The invention discloses a kind of water injection well solid acid rods, and the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid second
Ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion
It is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%, water
Dissolubility oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 30%,
Polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod are cylindrical type.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate
12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia
Salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
Preferably, the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%,
Water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sodium sulfonate 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate
Lotion 10%.
Preferably, the maleic acid-acrylic acid copolymer is made of maleic acid and acrylic acid copolymer, wherein maleic acid and third
The molar ratio of olefin(e) acid is 1:5 ~ 5:1.
Preferably, the solid acid rod shape is white cylindrical type, and wherein the diameter of cylinder type solid acid stick is 50mm, high
Degree is 300mm, and pH value is 3 ~ 4, and density is 1.8 ~ 2g/cm3。
Preferably, a kind of preparation method of water injection well solid acid rod as described above, comprising the following steps:
Step 1) prepares maleic acid-acrylic acid copolymer, then by 25% ~ 35% maleic acid-acrylic acid copolymer, 10% ~ 20%
Ethyl acetate, 10% ~ 18% water-soluble oleic imidazolinone corrosion inhibiter, 5% ~ 12% alpha-olefin sodium sulfonate, 20% ~ 30% diethyl
The mixing of alkene pentaacetic acid iron ammonia salt, and stir evenly, be heated to 60 DEG C and continue 4 hours；
5% ~ 15% polyvinyl acetate emulsion is added in the reaction mixture of step 1) by step 2, and is stirred evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Preferably, a kind of choosing and selling method of any one water injection well solid acid rod as above, the choosing and selling method is logical
Switching wellhead of water injection well process is crossed, directly bets 15 ~ 20 water injection well solid acid rods from the test valve at top, by its self weight
Shaft bottom is fallen into, as water injection well is gradually dissolved with solid acid rod, the blocking of near wellbore zone can be released, interval is thrown for 10 ~ 60 days again
Infuse water injection well solid acid rod.
Embodiment 6
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 1:5, then by 25%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 25kg), 20% ethyl acetate (the i.e. acetic acid second of 20kg
Ester), 10% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 10kg), 12% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 12kg), 20% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 20kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
Step 2 mixes the reaction that 13% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 13kg) is added to step 1)
In object, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 7
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 1:1, then by 35%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 35kg), 10% ethyl acetate (the i.e. acetic acid second of 10kg
Ester), 18% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 18kg), 5% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 5kg), 27% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 27kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
5% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 5kg) is added to the reaction mixture of step 1) by step 2
In, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 8
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 5:1, then by 30%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 30kg), 12% ethyl acetate (the i.e. acetic acid second of 12kg
Ester), 14% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 14kg), 7% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 7kg), 25% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 25kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
Step 2 mixes the reaction that 12% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 12kg) is added to step 1)
In object, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 9
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 1:3, then by 30%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 30kg), 15% ethyl acetate (the i.e. acetic acid second of 15kg
Ester), 10% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 10kg), 10% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 10kg), 20% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 20kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
Step 2 mixes the reaction that 15% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 15kg) is added to step 1)
In object, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 10
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 2:1, then by 33%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 33kg), 10% ethyl acetate (the i.e. acetic acid second of 10kg
Ester), 13% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 13kg), 6% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 6kg), 30% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 30kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
8% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 8kg) is added to the reaction mixture of step 1) by step 2
In, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Embodiment 11
Step 1) prepares maleic acid-acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 1:1, then by 32%
Maleic acid-acrylic acid copolymer (i.e. the maleic acid-acrylic acid copolymer of 32kg), 14% ethyl acetate (the i.e. acetic acid second of 14kg
Ester), 12% water-soluble oleic imidazolinone corrosion inhibiter (i.e. the water-soluble oleic imidazolinone corrosion inhibiter of 12kg), 8% alpha-olefin sulphur
Sour sodium (i.e. the alpha-olefin sodium sulfonate of 8kg), 24% diethylene triamine pentacetic acid (DTPA) iron ammonia salt (i.e. five second of diethylenetriamine of 24kg
Sour iron ammonia salt) mixing, and stir evenly, be heated to 60 DEG C and continue 4 hours；
Step 2 mixes the reaction that 10% polyvinyl acetate emulsion (i.e. the polyvinyl acetate emulsion of 10kg) is added to step 1)
In object, and stir evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), is cooled to room temperature and water injection well solid acid rod can be obtained.
Application Example 1
Solid acid rod prepared by embodiment 10 carries out live stake, and wherein solid acid rod shape is that white is cylindric, and diameter is
50mm, height 300mm, PH are 3 ~ 4, and density is 1.8 ~ 2.0g/cm3, before water injection well bets solid acid rod, water injection pressure is
19.5MPa, 20 sides of injection allocation/day, real 15 sides of note/day, betting the date for the first time is on April 15th, 2018, specifically bets process are as follows:
Oil pipe imported valve is closed, closing center's valve closes oil pipe outlet valve, the silk plug of lower test valve is dismantled, in test valve
Top install 1.5 meters tubing nipple and open test valve, by solid acid rod directly from top put into tubing nipple, then
Centre valve is opened, falls into solid acid rod in water injection well.
Bet 20 altogether according to the above process, solid acid rod falls into shaft bottom by its self weight, after stake 3 days, under water injection pressure
It is down to 18.8MPa, day injection allocation is still 20 sides/day, and real water filling rises to 20 sides/day, and hereafter pressure slightly rises, until 2018 5
Pressure is 19.2MPa, water injection pressure 19.5MPa before being still below when the moon 10, is filled at this time again according to above-mentioned stake process
15, pressure is more steady always, until June 30 in 2018, still in 19.1MPa, specific figure as shown in Figure 1, bets 20 solids
Water injection pressure decline in 3 days after sour stick, pressure was steady after on May 10th, 2018 bets 15 solid acid rods again, until 2018 6
The moon, pressure on the 30th was more steady always.
Application Example 2
Solid acid rod prepared by embodiment 11 carries out live stake, and wherein solid acid rod shape is that white is cylindric, and diameter is
50mm, height 300mm, PH are 3 ~ 4, and density is 1.8 ~ 2.0g/cm3, before water injection well bets solid acid rod, water injection pressure
20.5MPa, 25 sides of injection allocation/day, real 12 sides of note/day, on June 11st, 2018 bet the solid acid rod, and specific stake process is same to answer
With embodiment 1,15 are bet altogether, solid acid rod falls into shaft bottom by its self weight.
The well water injection pressure is tracked by monitoring, pressure is gradually reduced after 7 days, drops to 19.3MPa, and day injection allocation is still 25
Side/day, real water filling improve most 25 sides/day by 12 sides/day, meet injection allocation requirement, and water filling in 30 days is kept after betting solid acid rod
Stablize.
Solid acid rod of the present invention by maleic acid-acrylic acid copolymer, ethyl acetate, water-soluble oleic imidazolinone corrosion inhibiter,
Alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and polyvinyl acetate emulsion are made, and each component collocation is reasonable, Malaysia
Acid-acrylic copolymer is antisludging agent, and thermal stability is good, can be used under the conditions of 300 DEG C of high temperature hostiles, and ethyl acetate is in acid
Property, for hydrolyzable at acetic acid and ethyl alcohol, water-soluble oleic imidazolinone corrosion inhibiter makes sour stick have preferable corrosion mitigating effect, alpha-olefin sulphur
Sour sodium improves dissolved sour stick substance dialysis diadochy, diethylene triamine pentacetic acid (DTPA) iron for reducing oil water interfacial tension
Ammonia salt is chelating agent, and for forming stable chelate with metal ion, polyvinyl acetate emulsion is adhesive, solid of the present invention
Sour stick acidizing effect is good, effectively corrosion dirt, reduction water filling well pressure can improve water injection well daily water-injection rate, meet water injection well and match
Note requires.
Solid acid rod preparation method of the present invention is that each component is heated to 60 DEG C after mixing, and it is poly- to be subsequently added into adhesive
Acetate emulsion is formed by curing using rodlike compacting tool set after mixing, and solid acid rod preparation method of the present invention is simple, easily
Operation, does not generate any waste material, and the solid acid rod heatproof prepared is up to 75 DEG C, and formation pore is not destroyed after use
Structure solves the security risk of the acid solution transport and roping of existing liquid convenient for storage and roping.
Solid acid rod choosing and selling method of the present invention is simple, it is only necessary to switch wellhead of water injection well process, test valve is straight from top
Stake is connect, is fallen near shaft bottom using self weight, with mixing and gradually dissolving with injection water, effectively to pit shaft and near wellbore zone
Dirt carries out corrosion, plays the role of de-plugging, and by the pressure change of observation water injection well, intermittent bets solid acid rod, can make to infuse
Well fills the water steadily in the long term, and acidizing process of the present invention is simple, is acidified and fills the water while carrying out, does not need Zhan Jing, labor intensity is very
It is small, and do not return drain.
Solid acid rod of the present invention is small to the corrosion rate of tubing string, only 0.08g/m2H reaches industry primary standard, can be true
Water injection string will not be corroded during protecting solid acid rod stake；After solid acid rod of the present invention enters stratum, can slow release, acid
Change the time up to 6 hours or more, is able to achieve reservoir removing clog in deep reservoir.
The preferred embodiment for the present invention is explained in detail above, but the present invention is not limited to the above embodiments,
Those of ordinary skill in the art within the scope of knowledge, can also make various without departing from the purpose of the present invention
Variation.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.Reagent involved in above-mentioned can be from city
It is bought on.
Claims (7)
1. a kind of water injection well solid acid rod, it is characterised in that: the solid acid rod is by maleic acid-acrylic acid copolymer, acetic acid
Ethyl ester, water-soluble oleic imidazolinone corrosion inhibiter, alpha-olefin sodium sulfonate, diethylene triamine pentacetic acid (DTPA) iron ammonia salt and poly vinyl acetate emulsion
Liquid is made, wherein the weight percentage of each component are as follows: maleic acid-acrylic acid copolymer 25% ~ 35%, ethyl acetate 10% ~ 20%,
Water-soluble oleic imidazolinone corrosion inhibiter 10% ~ 18%, alpha-olefin sodium sulfonate 5% ~ 12%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~
30%, polyvinyl acetate emulsion 5% ~ 15%, the shape of the solid acid rod is cylindrical type.
2. a kind of water injection well solid acid rod according to claim 1, it is characterised in that: the weight percent of each component
Content are as follows: maleic acid-acrylic acid copolymer 30% ~ 35%, ethyl acetate 12% ~ 15%, water-soluble oleic imidazolinone corrosion inhibiter 10% ~
14%, alpha-olefin sodium sulfonate 6% ~ 10%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 20% ~ 25%, polyvinyl acetate emulsion 8% ~ 12%.
3. a kind of water injection well solid acid rod according to claim 2, it is characterised in that: the weight percent of each component
Content are as follows: maleic acid-acrylic acid copolymer 32%, ethyl acetate 14%, water-soluble oleic imidazolinone corrosion inhibiter 12%, alpha-olefin sulphur
Sour sodium 8%, diethylene triamine pentacetic acid (DTPA) iron ammonia salt 24%, polyvinyl acetate emulsion 10%.
4. a kind of water injection well solid acid rod according to claim 3, it is characterised in that: the maleic-acrylic acid is total
Polymers is made of maleic acid and acrylic acid copolymer, and wherein the molar ratio of maleic acid and acrylic acid is 1:5 ~ 5:1.
5. a kind of water injection well solid acid rod according to claim 1, it is characterised in that: the solid acid rod shape is white
Color cylinder type, it is highly 300mm that wherein the diameter of cylinder type solid acid stick, which is 50mm, and pH value is 3 ~ 4, and density is 1.8 ~ 2g/
cm3。
6. a kind of preparation method of water injection well solid acid rod as described in claim 1, which comprises the following steps:
Step 1) prepares maleic acid-acrylic acid copolymer, then by 25% ~ 35% maleic acid-acrylic acid copolymer, 10% ~ 20%
Ethyl acetate, 10% ~ 18% water-soluble oleic imidazolinone corrosion inhibiter, 5% ~ 12% alpha-olefin sodium sulfonate, 20% ~ 30% diethyl
The mixing of alkene pentaacetic acid iron ammonia salt, and stir evenly, be heated to 60 DEG C and continue 4 hours；
5% ~ 15% polyvinyl acetate emulsion is added in the reaction mixture of step 1) by step 2, and is stirred evenly；
Step 2 mixture is poured into rodlike compacting tool set by step 3), and being then cooled to room temperature can be obtained water injection well solid acid
Stick.
7. a kind of choosing and selling method of any one of such as claim 1 ~ 5 water injection well solid acid rod, it is characterised in that: the throwing
Injecting method is directly to bet 15 ~ 20 water injection wells from the test valve at the top of water injection well by switching wellhead of water injection well process and use
Solid acid rod falls into shaft bottom by its self weight, as water injection well is gradually dissolved with solid acid rod, can release the blocking of near wellbore zone,
Water injection well solid acid rod is bet again within 10 ~ 60 days in interval.
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| CN201910239134.1A CN110028946B (en) | 2019-03-27 | 2019-03-27 | Solid acid rod for water injection well and preparation and injection method thereof |
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| CN1861980A (en) * | 2006-05-17 | 2006-11-15 | 王洪新 | Injection pretreatment method for oil water well |
| CN102391852A (en) * | 2011-08-19 | 2012-03-28 | 中国石油天然气股份有限公司 | Autogenous gas preparation for oil and gas well acidification |
| CN102676150A (en) * | 2012-05-28 | 2012-09-19 | 中国石油天然气股份有限公司 | Solid acid for acid fracturing yield increase transformation |
| CN104445648A (en) * | 2014-11-14 | 2015-03-25 | 天津大港油田滨港集团博弘石油化工有限公司 | Corrosion and scale inhibitor for oilfield water injection treatment |
| CN104804718A (en) * | 2015-05-04 | 2015-07-29 | 中国石油集团渤海钻探工程有限公司 | Sustained-release solid acid for water injection wells in oil fields, and preparation method of sustained-release solid acid |
| CN108865092A (en) * | 2018-05-21 | 2018-11-23 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Water injection well unblocking and injection increasing sustained release chelated acid and preparation method and blockage -removing and stimulation |
-
2019
- 2019-03-27 CN CN201910239134.1A patent/CN110028946B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1861980A (en) * | 2006-05-17 | 2006-11-15 | 王洪新 | Injection pretreatment method for oil water well |
| CN102391852A (en) * | 2011-08-19 | 2012-03-28 | 中国石油天然气股份有限公司 | Autogenous gas preparation for oil and gas well acidification |
| CN102676150A (en) * | 2012-05-28 | 2012-09-19 | 中国石油天然气股份有限公司 | Solid acid for acid fracturing yield increase transformation |
| CN104445648A (en) * | 2014-11-14 | 2015-03-25 | 天津大港油田滨港集团博弘石油化工有限公司 | Corrosion and scale inhibitor for oilfield water injection treatment |
| CN104804718A (en) * | 2015-05-04 | 2015-07-29 | 中国石油集团渤海钻探工程有限公司 | Sustained-release solid acid for water injection wells in oil fields, and preparation method of sustained-release solid acid |
| CN108865092A (en) * | 2018-05-21 | 2018-11-23 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Water injection well unblocking and injection increasing sustained release chelated acid and preparation method and blockage -removing and stimulation |
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