CN115305079A - Alcohol-based multi-hydrogen acid liquid system for sandstone gas reservoir and application thereof - Google Patents
Alcohol-based multi-hydrogen acid liquid system for sandstone gas reservoir and application thereof Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 99
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000007789 gas Substances 0.000 title description 38
- 239000007788 liquid Substances 0.000 title description 10
- 239000001257 hydrogen Substances 0.000 title description 5
- 229910052739 hydrogen Inorganic materials 0.000 title description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000007797 corrosion Effects 0.000 claims abstract description 38
- 238000005260 corrosion Methods 0.000 claims abstract description 38
- 239000003112 inhibitor Substances 0.000 claims abstract description 38
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001556 precipitation Methods 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 239000003381 stabilizer Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 16
- 125000003158 alcohol group Chemical group 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 15
- -1 iron ion Chemical class 0.000 claims description 24
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 9
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- ZGINCXHGFXLOKC-UHFFFAOYSA-N 2,3,3,3-tetrafluoro-2-[1,1,2,3,3,3-hexafluoro-2-[1,1,2,3,3,3-hexafluoro-2-(trifluoromethoxy)propoxy]propoxy]propanoic acid Chemical class OC(=O)C(F)(C(F)(F)F)OC(F)(F)C(F)(C(F)(F)F)OC(F)(F)C(F)(C(F)(F)F)OC(F)(F)F ZGINCXHGFXLOKC-UHFFFAOYSA-N 0.000 claims description 6
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 6
- WTDHULULXKLSOZ-UHFFFAOYSA-N Hydroxylamine hydrochloride Chemical compound Cl.ON WTDHULULXKLSOZ-UHFFFAOYSA-N 0.000 claims description 6
- 235000010350 erythorbic acid Nutrition 0.000 claims description 6
- 229940026239 isoascorbic acid Drugs 0.000 claims description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 150000002462 imidazolines Chemical class 0.000 claims description 4
- 150000007524 organic acids Chemical class 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical group NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 3
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 3
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical group CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 3
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 claims description 3
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 claims description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 claims description 2
- 229940083575 sodium dodecyl sulfate Drugs 0.000 claims 1
- 230000020477 pH reduction Effects 0.000 description 19
- 230000000694 effects Effects 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 230000035515 penetration Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- TUWJQNVAGYRRHA-UHFFFAOYSA-N Menadiol dibutyrate Chemical compound C1=CC=C2C(OC(=O)CCC)=CC(C)=C(OC(=O)CCC)C2=C1 TUWJQNVAGYRRHA-UHFFFAOYSA-N 0.000 description 3
- BWRHOYDPVJPXMF-UHFFFAOYSA-N cis-Caran Natural products C1C(C)CCC2C(C)(C)C12 BWRHOYDPVJPXMF-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 150000007519 polyprotic acids Polymers 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- BDOYKFSQFYNPKF-UHFFFAOYSA-N 2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetic acid;sodium Chemical compound [Na].[Na].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O BDOYKFSQFYNPKF-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 229960001484 edetic acid Drugs 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical group C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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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
-
- 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
- C09K2208/26—Gel breakers other than bacteria or enzymes
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides an alcohol-based polyacid acid system for a sandstone gas reservoir. An alcohol group polyacid acid system for sandstone gas reservoirs comprises alcohol group preposed acid and alcohol group polyacid, wherein: the alcohol group preposed acid comprises 20 percent of methanol, 12 to 15 percent of industrial hydrochloric acid, 2 percent of first corrosion inhibitor, 1 percent of first iron ion stabilizer, 1 percent of first demulsifier, 1 percent of first cleanup additive and the balance of water according to weight percentage; the alcohol-based polyhydroic acid comprises, by weight, 20% of methanol, 12-15% of industrial hydrochloric acid, 5-6% of polyhydroic acid, 2% of a second corrosion inhibitor, 1% of a second iron ion stabilizer, 1% of a second demulsifier, 1% of a second cleanup additive, 1% of a precipitation inhibitor and the balance of water.
Description
Technical Field
The invention relates to the technical field of gas reservoir exploitation, in particular to an alcohol-based polyhydrolic acid liquid system for a sandstone gas reservoir and application thereof.
Background
At present, fracturing is mostly adopted for a gas reservoir as a yield increase measure, however, part of the gas reservoir needs to consider the integrity of the oil reservoir and is not suitable for the fracturing measure, and at the moment, acidification becomes a suitable and effective measure. However, the conventional acid system has an obvious disadvantage in gas reservoir acidification that external fluid retention and secondary damage caused by airlock are easily generated, so that the measure effect is seriously influenced, and meanwhile, the conventional earth acid with high corrosion rate is easy to generate secondary precipitation damage after reacting with the sandstone formation, so that the measure effect is reduced to a certain extent.
In particular, in order to maximize the pore permeability parameters of the treatment zone, acid systems used in sandstone and conglomerate reservoir acidizing measures are mainly earth acid, conventional retarded acid and authigenic earth acid, and the acid system has the advantage of high acid corrosion rate. However, after the conventional acid liquor is taken measures in the gas reservoir, the water lock damage of the gas reservoir is caused by the capillary force self-absorption function and the liquid phase retention function of the oil-gas reservoir, and the flowback rate of the fluid entering the well is less than 30% under the serious condition, although the measure function plays a role in increasing the pore permeation parameters of the processing zone, the serious water lock damage counteracts the measure effect to a great extent, and the objective representation reflected by the production data is poor or even ineffective in the measure effect; in addition, the other part of the reasons is that the conventional acid liquid system is easy to form secondary precipitation damage under the condition of untimely flowback or in the flowback process, especially when the concentration of hydrofluoric acid is high.
For the above reasons, there is a need for a new acid solution system suitable for sandstone gas reservoirs to reduce the secondary precipitation of the acidification reactant, avoid the water lock damage of the external fluid, improve the flowback rate, and further improve the gas production yield.
Disclosure of Invention
The invention mainly aims to provide an alcohol-based polyacid acid system for a sandstone gas reservoir and application thereof, and aims to solve the problems that in the prior art, the sandstone gas reservoir is seriously damaged by water lock in the acidification process, the flowback rate is low and the gas recovery is affected.
In order to achieve the above object, according to one aspect of the present invention, there is provided an alcohol-based polyacid acid system for sandstone gas reservoirs, which comprises an alcohol-based pre-acid and an alcohol-based polyacid, wherein: the alcohol group preposed acid comprises 20 percent of methanol, 12 to 15 percent of industrial hydrochloric acid, 2 percent of first corrosion inhibitor, 1 percent of first iron ion stabilizer, 1 percent of first demulsifier, 1 percent of first cleanup additive and the balance of water according to weight percentage; the alcohol-based polyhydroic acid comprises, by weight, 20% of methanol, 12-15% of industrial hydrochloric acid, 5-6% of polyhydroic acid, 2% of a second corrosion inhibitor, 1% of a second iron ion stabilizer, 1% of a second demulsifier, 1% of a second cleanup additive, 1% of a precipitation inhibitor and the balance of water.
Further, the polyhydrogen acid is a long-chain organic acid.
Further, the first corrosion inhibitor and the second corrosion inhibitor are respectively and independently selected from one or more of polymer corrosion inhibitors, quaternary ammonium salt compounds and imidazoline derivative corrosion inhibitors.
Further, the polymer corrosion inhibitor is nonylphenol polyoxyethylene ether; the quaternary ammonium salt compound corrosion inhibitor is diethylenetriamine.
Further, the first iron ion stabilizer and the second iron ion stabilizer are respectively and independently selected from one or more of citric acid, ethylene diamine tetraacetic acid disodium, isoascorbic acid and hydroxylamine hydrochloride.
Further, the first demulsifier and the second demulsifier are respectively and independently selected from phenolic resin and/or polyoxypropylene polyoxyethylene ether.
Further, the first cleanup additive and the second cleanup additive are respectively and independently selected from one or more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, alkylphenol ethoxylates, epoxypropyl trimethyl ammonium chloride, dodecyl trimethyl ammonium chloride, polyethylene glycol, salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid, and salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid.
Further, the precipitation inhibitor is a compound of nano silicon dioxide, citric acid and ammonium chloride.
According to another aspect of the invention, a sandstone gas reservoir acidizing method is also provided, wherein the alcohol-based polyhydrolic acid system is adopted to acidize the sandstone gas reservoir.
And further, injecting the alcohol group preposed acid in the alcohol group polybasic acid liquid system into the sandstone gas reservoir for pretreatment, and then injecting the alcohol group polybasic acid in the alcohol group polybasic acid liquid system into the sandstone gas reservoir to complete acidification.
The alcohol-based polyacid acid system provided by the invention is suitable for acidification of sandstone gas reservoirs, can effectively solve the problem of water lock damage of external fluids, and achieves the purpose of thorough flowback as much as possible. Through formula optimization, the multi-hydrogen acid system not only has a deep penetration effect, but also has a strong secondary sedimentation inhibiting effect, and basically achieves the effect of no secondary sedimentation.
In a word, the alcohol-based acid and the polyhydroic acid are compounded into an acid solution system for the first time, two main defects of incomplete flowback caused by water lock after gas reservoir acidification measures and secondary precipitation generated after the measures are effectively overcome, the effects of slow speed and deep penetration can be achieved to a certain extent, the flowback rate is effectively improved, and the gas production rate is further improved.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As described in the background art, in the prior art, the sandstone gas reservoir acidification process has serious water lock damage, which easily causes low flowback rate and affects gas production.
In order to solve the problems, the invention provides an alcohol-based polyhydroic acid system for a sandstone gas reservoir, which comprises an alcohol-based pre-acid and an alcohol-based polyhydroic acid, wherein: the alcohol group preposed acid comprises 20 percent of methanol, 12 to 15 percent of industrial hydrochloric acid, 2 percent of first corrosion inhibitor, 1 percent of first iron ion stabilizer, 1 percent of first demulsifier, 1 percent of first cleanup additive and the balance of water according to weight percentage; the alcohol-based polyhydroic acid comprises, by weight, 20% of methanol, 12-15% of industrial hydrochloric acid, 5-6% of polyhydroic acid, 2% of a second corrosion inhibitor, 1% of a second iron ion stabilizer, 1% of a second demulsifier, 1% of a second cleanup additive, 1% of a precipitation inhibitor and the balance water.
The alcohol-based polyacid acid system provided by the invention is suitable for sandstone gas reservoir acidification, and can ensure the formation of a homogeneous azeotropic system by matching methanol and polyacid and optimizing the formula, thereby effectively solving the problem of water lock damage of external fluid, achieving the purpose of thorough flowback as much as possible and reducing the retention ratio of a stratum. Meanwhile, through formula optimization, the multi-hydrogen acid system not only has a deep penetration effect, but also has a strong secondary precipitation inhibition effect, and basically achieves the effect of no secondary precipitation, and meanwhile, the multi-hydrogen acid system not only has a high corrosion rate, but also has a strong rock skeleton maintaining effect, the rock strength is reduced by a very small extent after measures, and formation sand production can be avoided.
In a word, the invention compounds the alcohol-based acid and the polyhydroic acid into an acid liquor system for the first time, effectively solves two main defects of incomplete flowback caused by water lock after gas reservoir acidification measures and secondary precipitation generated after the measures, can play a role in retarding and deep penetration to a certain extent, effectively improves the flowback rate and further improves the gas recovery rate.
In the practical application process, the alcohol-based pre-acid can be injected and washed in advance, and then the alcohol-based polyhydroic acid is injected into the stratum for acid corrosion. In a preferred embodiment, the polyhydroic acid is a long-chain organic acid (e.g., a synthetic long-chain organic acid, which can be of the type). The polyhydrogen acid, methanol and other components are selected to jointly form a polyhydrogen acid system, which is favorable for further reducing water lock damage, further improving the flowback effect and reducing the retention ratio of the stratum.
The addition of the industrial hydrochloric acid in the pre-acid can form an acid solution environment with a certain concentration in the stratum and wash the pretreated stratum, so that an acid environment is provided for subsequent main acid corrosion, carbonate substances in a rock matrix can be corroded by the pre-acid, and the effect of primary corrosion can be achieved. The industrial hydrochloric acid added into the polyhydroic acid theme can also form a compound system together with methanol and polyhydroic acid to fully perform acid corrosion on the stratum. The industrial hydrochloric acid is a 31% hydrogen peroxide aqueous solution.
In order to reduce the corrosion rate of the acid liquid to the metal pipe (mainly referring to the acid liquid contact part of the well structure, the oil casing pipe and the like) in the acidification process, so that the corrosion index reaches the industry regulation requirement or even better index, in a preferred embodiment, the first corrosion inhibitor and the second corrosion inhibitor are respectively and independently selected from one or more of polymer corrosion inhibitors, quaternary ammonium salt compounds and imidazoline derivative corrosion inhibitors. More preferably, the polymeric corrosion inhibitor is nonylphenol polyoxyethylene ether; the quaternary ammonium salt compound corrosion inhibitor is diethylenetriamine; the imidazoline derivative corrosion inhibitor is hydroxyquinoline. Preferably, the corrosion inhibitor adopts HS-6 and HS-7.
In a preferred embodiment, the first iron ion stabilizer and the second iron ion stabilizer are each independently selected from one or more of citric acid, ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, isoascorbic acid, hydroxylamine hydrochloride. The iron ion stabilizers are selected, so that the generation of acid sludge and the formation of secondary precipitates are reduced in the implementation of acidification and the production after acidification, and the acidification effect is further improved. Preferably, the iron ion stabilizer adopts TWJ-7 isoascorbic acid.
The demulsifier has the main function of destroying the emulsified state in the stratum, so that acid liquor can more fully contact with the rock matrix and the surface, and the acidification effect is improved. In order to further increase the acidifying effect, in a preferred embodiment, the first and second demulsifiers are each independently selected from the group consisting of phenolic resins and/or polyoxypropylene polyoxyethylene ethers. PR-7 is preferably used as the demulsifier.
In a preferred embodiment, the first and second cleanup additives are each independently selected from one or more of sodium dodecylbenzene sulfonate, sodium lauryl sulfate, alkylphenol ethoxylates, epoxypropyltrimethylammonium chloride, dodecyltrimethylammonium chloride, polyethylene glycol, salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid, and salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid. The selection of the plurality of discharge assistants is beneficial to providing smaller surface interfacial tension for an acid liquid system after an acidification measure, reducing the flow resistance of liquid and enabling the residual acid to be easier to flow back. Preferably, the cleanup additive is selected from ZPJ-6 and ZP-1.
The precipitation inhibitor has the functions of dispersing siliceous components dissolved from rock matrix in residual acid liquor, inhibiting aggregation and precipitation of the siliceous components, reducing secondary precipitation of acid liquor as much as possible and improving the effect of acidification measures. In order to better perform the above-mentioned function, in a preferred embodiment, the precipitation inhibitor is a nano-silica, citric acid, ammonium chloride compound. Preference is given to
According to another aspect of the invention, a sandstone gas reservoir acidizing method is also provided, which comprises the step of acidizing the sandstone gas reservoir by using the alcohol-based polyhydroic acid system. The invention compounds the alcohol-based acid and the polyhydroic acid into an acid liquor system for the first time, effectively solves two main defects of incomplete flowback caused by water lock after gas reservoir acidification measures and secondary precipitation generated after the measures, can play the effects of retarding and deep penetration to a certain extent, effectively improves the flowback rate and further improves the gas recovery rate.
In a preferred embodiment, the alcohol group pre-acid in the alcohol group polyacid acid solution system is injected into the sandstone gas reservoir for pretreatment, and then the alcohol group polyacid in the alcohol group polyacid acid solution system is injected into the sandstone gas reservoir to complete acidification.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.
Example 1
This embodiment provides an alcohol based polyacid acid system comprising an alcohol based pre-acid and an alcohol based polyacid, wherein:
the alcohol group front acid comprises 20% of methanol, 12-15% of industrial hydrochloric acid, 2% of a first corrosion inhibitor HS-6 (Xinjiang Kangen practical petrochemical company, ltd.), 1% of a first iron ion stabilizer (TWJ-7 isoascorbic acid, xinjiang Karma Ke Meili chemical company, ltd.), 1% of a first demulsifier (PR-7, xinjiang Kangen practical petrochemical company, ltd.), 1% of a first cleanup additive (ZPJ-6, xinjiang Karma Ke Meili chemical company, ltd.), and the balance of water in percentage by weight;
the alcohol-based polyhydroic acid comprises, by weight, 20% of methanol, 12-15% of industrial hydrochloric acid, 5-6% of polyhydroic acid (DQS-1, xinjiang Karan petrochemical company Limited), 2% of a second corrosion inhibitor (HS-7, xinjiang Kalimaco Milli chemical company Limited), 1% of a second iron ion stabilizer (TWJ-7 isoascorbic acid, xinjiang Kalimaco Milli chemical company Limited), 1% of a second demulsifier (PR-7, xinjiang Karan petrochemical company Limited), 1% of a second cleanup additive (ZP-1, xinjiang Kalimaco Milli chemical company Limited), 1% of a precipitation inhibitor (CDYZ-1, nano-silica, citric acid, ammonium chloride complex, xinjiang Karan petrochemical company Limited) and the balance of water.
The acid liquor system is adopted to carry out dynamic core experiments, and the acid liquor flowback rate is over 80 percent, and the core permeability is improved by over 30 percent.
The acid liquor system is used for 9 wells in the gas storage measure of the Xinjiang oil field, the problem that two wells cannot be used in the early stage is successfully solved, the yield of a single well in the gas production period is effectively improved by other 7 wells, and the daily yield improvement value of the 9 wells in the gas production period is up to 200 multiplied by 104m at most 3 The single well raising value is 5 to 30 multiplied by 104m 3 /d。
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The alcohol-based polyacid acid system for the sandstone gas reservoir is characterized by comprising an alcohol-based preposed acid and an alcohol-based polyacid, wherein:
the alcohol group preposed acid comprises 20 percent of methanol, 12 to 15 percent of industrial hydrochloric acid, 2 percent of first corrosion inhibitor, 1 percent of first iron ion stabilizer, 1 percent of first demulsifier, 1 percent of first cleanup additive and the balance of water according to weight percentage;
the alcohol-based polyhydroic acid comprises, by weight, 20% of methanol, 12-15% of industrial hydrochloric acid, 5-6% of polyhydroic acid, 2% of a second corrosion inhibitor, 1% of a second iron ion stabilizer, 1% of a second demulsifier, 1% of a second cleanup additive, 1% of a precipitation inhibitor and the balance of water.
2. The alcohol-based polyacid acid system for sandstone gas reservoirs of claim 1, wherein the polyacid is a long-chain organic acid.
3. The alcohol-based polyacid acid system for sandstone gas reservoirs of claim 1, wherein the first corrosion inhibitor and the second corrosion inhibitor are respectively and independently selected from one or more of polymer, quaternary ammonium salt compound and imidazoline derivative corrosion inhibitors.
4. The alcohol-based polyacid acid system for the sandstone gas reservoir of claim 3, wherein the polymer-based corrosion inhibitor is nonylphenol polyoxyethylene ether; the quaternary ammonium salt compound corrosion inhibitor is diethylenetriamine.
5. The alcohol based polyacid system of any of claims 1 to 4, wherein the first and second iron ion stabilizers are each independently selected from one or more of citric acid, ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, isoascorbic acid, hydroxylamine hydrochloride.
6. The alcohol based polyacid acid system for sandstone gas reservoirs of any of claims 1 to 4, wherein the first demulsifier and the second demulsifier are each independently selected from phenolic resins and/or polyoxypropylene polyoxyethylene ethers.
7. The alcohol based polyacid acid system for sandstone gas reservoirs according to any of claims 1 to 4, wherein the first cleanup additive and the second cleanup additive are each independently selected from one or more of sodium dodecylbenzenesulfonate, sodium dodecylsulfate, alkylphenol ethoxylates, epoxypropyltrimethylammonium chloride, dodecyltrimethylammonium chloride, polyethylene glycol, salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid, and salts of perfluoro 2,5, 8-trimethyl-3, 6, 9-trioxadecanoic acid.
8. The acid liquor system of an alcohol-based polyhydroic acid for sandstone gas reservoirs of any of claims 1 to 4, wherein the precipitation inhibitor is a compound of nano-silica, citric acid, ammonium chloride.
9. A sandstone gas reservoir acidizing method, which is characterized in that the sandstone gas reservoir is acidized by using the alcohol-based polyacid acid system of any one of claims 1 to 8.
10. The sandstone gas reservoir acidizing method of claim 9, wherein the alcohol-based pre-acid in the alcohol-based polyacid acid system is injected into the sandstone gas reservoir for pretreatment, and then the alcohol-based polyacid in the alcohol-based polyacid acid system is injected into the sandstone gas reservoir to complete the acidizing.
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