CN111334272A - Scale remover for water injection system of oil and gas field and preparation and application methods thereof - Google Patents
Scale remover for water injection system of oil and gas field and preparation and application methods thereof Download PDFInfo
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- CN111334272A CN111334272A CN202010276201.XA CN202010276201A CN111334272A CN 111334272 A CN111334272 A CN 111334272A CN 202010276201 A CN202010276201 A CN 202010276201A CN 111334272 A CN111334272 A CN 111334272A
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- water injection
- oil
- injection system
- remover
- acid
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000002347 injection Methods 0.000 title claims abstract description 72
- 239000007924 injection Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims abstract description 37
- 238000005260 corrosion Methods 0.000 claims abstract description 37
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 36
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003112 inhibitor Substances 0.000 claims abstract description 21
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 19
- 239000002738 chelating agent Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 claims abstract description 16
- GAWAYYRQGQZKCR-REOHCLBHSA-N (S)-2-chloropropanoic acid Chemical compound C[C@H](Cl)C(O)=O GAWAYYRQGQZKCR-REOHCLBHSA-N 0.000 claims abstract description 15
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 15
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 15
- 239000011593 sulfur Substances 0.000 claims abstract description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 14
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003672 gas field water Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 10
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 25
- 239000011259 mixed solution Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 19
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 17
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 13
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 13
- YZYASTRURKBPPS-UHFFFAOYSA-N C(CCC(=O)OCCCCCC(C)C)(=O)OCCCCCC(C)C.[Na] Chemical compound C(CCC(=O)OCCCCCC(C)C)(=O)OCCCCCC(C)C.[Na] YZYASTRURKBPPS-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000002332 oil field water Substances 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- -1 sulfonate imidazoline quaternary ammonium salt Chemical class 0.000 claims description 7
- 150000001412 amines Chemical group 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- MQKXWEJVDDRQKK-UHFFFAOYSA-N bis(6-methylheptyl) butanedioate Chemical compound CC(C)CCCCCOC(=O)CCC(=O)OCCCCCC(C)C MQKXWEJVDDRQKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 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 description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- IEDVJHCEMCRBQM-UHFFFAOYSA-N trimethoprim Chemical compound COC1=C(OC)C(OC)=CC(CC=2C(=NC(N)=NC=2)N)=C1 IEDVJHCEMCRBQM-UHFFFAOYSA-N 0.000 claims description 2
- 229960001082 trimethoprim Drugs 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 28
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 11
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 11
- 229910017053 inorganic salt Inorganic materials 0.000 abstract description 7
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- UBXAKNTVXQMEAG-UHFFFAOYSA-L strontium sulfate Chemical compound [Sr+2].[O-]S([O-])(=O)=O UBXAKNTVXQMEAG-UHFFFAOYSA-L 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 239000001488 sodium phosphate Substances 0.000 description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 description 3
- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- AZSFNUJOCKMOGB-UHFFFAOYSA-K cyclotriphosphate(3-) Chemical compound [O-]P1(=O)OP([O-])(=O)OP([O-])(=O)O1 AZSFNUJOCKMOGB-UHFFFAOYSA-K 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000668 effect on calcium Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
-
- 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
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a scale remover for an oil-gas field water injection system, which consists of the following substances in percentage by mass: 1-3% of hydrofluoric acid, 5-18% of hydrochloric acid, 2-6% of a sulfur remover, 6-10% of a metal ion chelating agent, 1-2% of an oil stain remover, 0.5-1% of a corrosion inhibitor and the balance of water; the desulfurizing agent consists of crotonic acid, chloropropionic acid and copper sulfate, and the mass ratio of the crotonic acid to the chloropropionic acid to the copper sulfate is (1-4): (0.5-1): (0.5 to 1); the scale remover has the advantages of few varieties of preparation raw materials and simple preparation method; all inorganic salt scale, oil scale, ferrous sulfide and metal corrosion products in the water injection system can be quickly and efficiently dissolved, and the water injection system pipeline and equipment are not corroded; no hydrogen sulfide gas is discharged in the construction process, so that the safety of constructors is guaranteed, and the surrounding environment is protected.
Description
Technical Field
The invention belongs to the technical field of oil field water treatment, and particularly relates to a scale remover for an oil and gas field water injection system, a preparation method of the scale remover and a method for applying the scale remover to the oil and gas field water injection system.
Background
In the process of water injection development of oil and gas fields, scale forming ion balance is influenced by factors such as water quality, pressure, temperature, flow rate change and the like, and can be combined into calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, strontium sulfate and the like to be deposited, so that parts such as pipelines, elbows, gates and the like in a water injection system are seriously scaled. Scaling can cause the problems of oil and gas yield reduction, water injection pressure rise, efficiency reduction of underground and ground equipment and the like, and even can cause the production stop and the scrapping of the oil and gas well.
The existing oil and gas field descaling methods mainly comprise the following three methods:
(1) mechanical method: removing the scale on the pipe wall by using a special tool and the like, and carrying the scale back to the ground by backwashing; the method has incomplete descaling and needs to spend a large amount of manpower, material resources and financial resources.
(2) Physical method: changing the frequency of the fluid by using an ultrasonic technology or an electromagnetic technology to descale; the operation is convenient, no pollution is caused to the environment, and secondary generation of scale can be effectively prevented; however, the method is started late in China and is still in the research stage at present;
(3) the chemical method comprises the following steps: chemical agents and scales are subjected to chemical reaction to dissolve, loosen and fall off the scales, so that the aim of removing the scales is fulfilled; the descaling method is thorough, the construction process is simple, the normal production of the oil and gas well can be quickly recovered, and the descaling method is also a commonly adopted descaling method for various oil and gas fields at present. The most common chemical descaling method is acid cleaning, the acid cleaning descaling is mainly used for carbonate scale, hydroxide scale and iron compound scale, the common acids are inorganic acid and organic acid, the inorganic acid mainly comprises hydrochloric acid, hydrofluoric acid, nitric acid and sulfuric acid, and the organic acid mainly comprises oxalic acid, acetic acid, sulfamic acid, citric acid and the like. Although the acid washing has a good cleaning effect, the acid washing can easily cause corrosion of metal materials of equipment and aging of non-metal materials, and meanwhile, the acid washing has no effect on calcium sulfate scale, barium sulfate, strontium sulfate scale and silicate scale, so that the acid washing has strong limitation. Pickling also produces large amounts of carbon dioxide and hydrogen sulfide gas, potentially compromising equipment and personnel safety.
The invention content is as follows:
in order to solve the technical problems, the invention provides a scale remover for an oil-gas field water injection system, which has the advantages of less varieties of used preparation raw materials and simple preparation method; the method is safe and environment-friendly, and has no pollution to the stratum; can quickly and efficiently remove all inorganic salt scale, oil scale, ferrous sulfide and metal corrosion products in a water injection system, has no corrosion to pipelines and equipment of the water injection system, has no discharge of toxic and harmful hydrogen sulfide gas, and has no harm to the safety of the equipment and personnel.
The technical scheme provided by the invention is as follows:
the scale remover for the water injection system of the oil and gas field consists of the following substances in percentage by mass: 1-3% of hydrofluoric acid, 5-18% of hydrochloric acid, 2-6% of a sulfur remover, 6-10% of a metal ion chelating agent, 0.5-1% of an oil dirt remover, 0.5-1% of a corrosion inhibitor and the balance of water; the desulfurizing agent consists of crotonic acid, chloropropionic acid and copper sulfate, and the mass ratio of the crotonic acid to the chloropropionic acid to the copper sulfate is (1-4): (0.5-1): (0.5 to 1).
Preferably, the metal ion chelating agent is sodium amine trimetaphosphate.
Preferably, the oil stain remover consists of sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant, wherein the mass ratio of the sodium diisooctyl succinate sulfonate to the fluorocarbon surfactant is 3: 1-5: 1.
preferably, the corrosion inhibitor is sulfonate imidazoline quaternary ammonium salt.
The invention also discloses a method for preparing the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) according to the mass fraction of each medicament, hydrofluoric acid, hydrochloric acid, a sulfur remover, a metal ion chelating agent, an oil dirt remover, a corrosion inhibitor and water are accurately measured. Firstly, adding water into a liquid preparation tank with a stirrer, starting the stirrer, adding a corrosion inhibitor under the stirring condition, sequentially adding crotonic acid, chloropropionic acid and copper sulfate after the corrosion inhibitor is completely dissolved, and continuously stirring uniformly to obtain a mixed solution I;
(2) under the condition of stirring, sequentially adding a metal ion chelating agent, hydrofluoric acid and hydrochloric acid into the mixed solution I obtained in the step (1) to obtain a mixed solution II;
(3) and (3) under the stirring condition, sequentially adding sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant into the mixed solution II obtained in the step (2), and fully and uniformly stirring to obtain the scale remover for the water injection system of the oil and gas field.
Preferably, the entire operation is carried out at normal temperature.
The invention also discloses an application method of the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) closing the water injection pump and the valve, and pumping the descaling agent into the water injection system pipeline and the shaft pipe column by using a pump truck;
(2) after the scale remover is completely injected, the scale remover and the dirt are fully reacted;
(3) opening a water injection valve, starting a water injection pump, cleaning pipelines and a shaft pipe column of a water injection system by using injection water, and transporting the waste liquid discharged back to a sewage station for centralized treatment after being collected by a tank car;
(4) when the appearance of the flowback waste liquid is the same as that of the injected water and the pH value of the solution is more than 5, the flowback is stopped, and the normal production running state can be entered.
Preferably, the reaction time in the step (2) is 6-8 h.
Compared with the prior art, the invention has the following technical advantages:
(1) the hydrofluoric acid and the hydrochloric acid in the invention can be used for dissolving all inorganic salt scale and metal corrosion products; butenoic acid contains unsaturated double bond and carboxyl in the molecule, so that the butenoic acid has the property of acid, can dissolve inorganic salt scale, and is easy to perform addition reaction on the double bond so as to remove sulfur; chloropropionic acid can react with bivalent sulfur in an acidic medium to generate organic sulfide; the copper sulfate and the divalent sulfur react to generate copper sulfide which is insoluble in acid, and the copper sulfide, the divalent sulfur and the divalent sulfur act synergistically to form a sulfur removal agent, so that divalent sulfur ions after ferrous sulfide is dissolved can be removed rapidly and completely, and meanwhile, hydrogen sulfide gas is prevented from being generated.
(2) The amine sodium trimethoprim phosphate has strong chelating capacity, can be chelated with most metal ions to form a stable chelate, and is easy to biodegrade; the combination of the sodium diisooctyl succinate sulfonate and the fluorocarbon surfactant can quickly permeate the scale remover into the scale deposit to react with inorganic salt scale, corrosion products and oil sludge, so that the hard scale deposit becomes loose and is easy to peel, fall off and dissolve.
(3) The sulfonate type imidazoline quaternary ammonium salt has good corrosion inhibition performance, wetting, decontamination and foaming performance, and can be chelated with metal ions, so that on one hand, the secondary damage of an oil stain remover to a pipeline is prevented, on the other hand, the metal ions are further removed by cooperating with a metal ion chelating agent, and the oil stain in a fouling layer is dissolved by cooperating with the oil stain remover; the use cost is low, the method is safe and environment-friendly, and the method has no corrosion to pipelines and equipment of a water injection system and no pollution to the stratum.
Detailed Description
The invention will now be further described with reference to specific examples.
Example 1
The invention discloses a scale remover for an oil-gas field water injection system, which consists of the following substances in percentage by mass: 2% of hydrofluoric acid, 18% of hydrochloric acid, 2% of crotonic acid, 0.5% of chloropropionic acid, 1% of copper sulfate, 10% of amine trimethylene sodium phosphate, 0.5% of diisooctyl succinate sodium sulfonate, 0.1% of fluorocarbon surfactant, 1% of sulfonate type imidazoline quaternary ammonium salt and 64.9% of water.
The invention also discloses a method for preparing the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) according to the mass fraction of each medicament, hydrofluoric acid, hydrochloric acid, a sulfur remover, a metal ion chelating agent, an oil dirt remover, a corrosion inhibitor and water are accurately measured. Firstly, adding water into a liquid preparation tank with a stirrer, starting the stirrer, adding a corrosion inhibitor under the stirring condition, sequentially adding crotonic acid, chloropropionic acid and copper sulfate after the corrosion inhibitor is completely dissolved, and continuously stirring uniformly to obtain a mixed solution I;
(2) under the condition of stirring, sequentially adding a metal ion chelating agent, hydrofluoric acid and hydrochloric acid into the mixed solution I obtained in the step (1) to obtain a mixed solution II;
(3) and (3) under the stirring condition, sequentially adding sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant into the mixed solution II obtained in the step (2), and fully and uniformly stirring to obtain the scale remover for the water injection system of the oil and gas field.
The invention also discloses an application method of the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) closing the water injection pump and the valve, and injecting the descaling agent into the water injection system pipeline and the shaft pipe column by using a pump truck;
(2) after the descaling agent is completely injected, the descaling agent and the dirt are fully reacted, and the reaction time is 8 hours;
(3) opening a water injection valve, starting a water injection pump, cleaning pipelines and a shaft pipe column of a water injection system by using injection water, collecting the waste liquid discharged back by using a tank car, and then conveying the waste liquid to a sewage station for centralized treatment;
(4) when the appearance of the flowback waste liquid is the same as that of the injected water and the pH value of the solution is more than 5, the flowback is stopped, and the normal production running state can be entered.
The application method uses a detergent solution of 28m3During the period, the detection of a hydrogen sulfide detector shows that no hydrogen sulfide gas is released, and the water injection pressure is reduced from 13.5MPa to 10MPa after the use.
Example 2
The invention discloses a scale remover for an oil-gas field water injection system, which consists of the following substances in percentage by mass: 3% of hydrofluoric acid, 15% of hydrochloric acid, 4% of crotonic acid, 1% of chloropropionic acid, 1% of copper sulfate, 8% of amine trimethylene sodium phosphate, 0.6% of diisooctyl succinate sodium sulfonate, 0.2% of fluorocarbon surfactant, 0.8% of sulfonate type imidazoline quaternary ammonium salt and 66.4% of water.
The invention also discloses a method for preparing the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) according to the mass fraction of each medicament, hydrofluoric acid, hydrochloric acid, a sulfur remover, a metal ion chelating agent, an oil dirt remover, a corrosion inhibitor and water are accurately measured. Firstly, adding water into a liquid preparation tank with a stirrer, starting the stirrer, adding a corrosion inhibitor under the stirring condition, sequentially adding crotonic acid, chloropropionic acid and copper sulfate after the corrosion inhibitor is completely dissolved, and continuously stirring uniformly to obtain a mixed solution I;
(2) under the condition of stirring, sequentially adding a metal ion chelating agent, hydrofluoric acid and hydrochloric acid into the mixed solution I obtained in the step (1) to obtain a mixed solution II;
(3) and (3) under the stirring condition, sequentially adding sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant into the mixed solution II obtained in the step (2), and fully and uniformly stirring to obtain the scale remover for the water injection system of the oil and gas field.
The invention also discloses an application method of the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) closing the water injection pump and the valve, and pumping the descaling agent into the water injection system pipeline and the shaft pipe column by using a pump truck;
(2) after the descaling agent is completely injected, the descaling agent and the dirt are fully reacted, and the reaction time is 8 hours;
(3) opening a water injection valve, starting a water injection pump, cleaning pipelines and a shaft pipe column of a water injection system by using injection water, collecting the waste liquid discharged back by using a tank car, and then conveying the waste liquid to a sewage station for centralized treatment;
(4) when the appearance of the flowback waste liquid is the same as that of the injected water and the pH value of the liquid is more than 5, the flowback is stopped, and the normal production running state can be entered.
The application method uses 32m of detergent solution3During the period, the detection of a hydrogen sulfide detector shows that no hydrogen sulfide gas is released, and the water injection pressure is reduced from 12MPa to 8.5MPa after the use.
Example 3
The invention discloses a scale remover for an oil-gas field water injection system, which consists of the following substances in percentage by mass: 1% of hydrofluoric acid, 14% of hydrochloric acid, 1% of crotonic acid, 0.5% of chloropropionic acid, 0.5% of copper sulfate, 6% of amine trimethylene sodium phosphate, 0.8% of diisooctyl succinate sodium sulfonate, 0.2% of fluorocarbon surfactant, 0.5% of sulfonate type imidazoline quaternary ammonium salt and 75.5% of water.
The invention also discloses a method for preparing the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) according to the mass fraction of each medicament, hydrofluoric acid, hydrochloric acid, a sulfur remover, a metal ion chelating agent, an oil dirt remover, a corrosion inhibitor and water are accurately measured. Firstly, adding water into a liquid preparation tank with a stirrer, starting the stirrer, adding a corrosion inhibitor under the stirring condition, sequentially adding crotonic acid, chloropropionic acid and copper sulfate after the corrosion inhibitor is completely dissolved, and continuously stirring uniformly to obtain a mixed solution I;
(2) under the condition of stirring, sequentially adding a metal ion chelating agent, hydrofluoric acid and hydrochloric acid into the mixed solution I obtained in the step (1) to obtain a mixed solution II;
(3) and (3) under the stirring condition, sequentially adding sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant into the mixed solution II obtained in the step (2), and fully and uniformly stirring to obtain the scale remover for the water injection system of the oil and gas field.
The invention also discloses an application method of the scale remover for the water injection system of the oil and gas field, which comprises the following steps:
(1) closing the water injection pump and the valve, and pumping the descaling agent into the water injection system pipeline and the shaft pipe column by using a pump truck;
(2) after all the scale remover is injected, the scale remover and the dirt are fully reacted, and the reaction time is 6 hours;
(3) opening a water injection valve, starting a water injection pump, cleaning pipelines and a shaft pipe column of a water injection system by using injection water, collecting the waste liquid discharged back by using a tank car, and then conveying the waste liquid to a sewage station for centralized treatment;
(4) when the appearance of the flowback waste liquid is the same as that of the injected water and the pH value of the solution is more than 5, the flowback is stopped, and the normal production running state can be entered.
The application method uses 25m of scale remover solution3During the period, the detection of a hydrogen sulfide detector shows that no hydrogen sulfide gas is released, and the water injection pressure is reduced from 13MPa to 8.5MPa after the use.
Measurement of Performance
The invention discloses a descaling agent for an oil-gas field water injection system, wherein the content of main components of calcium carbonate, ferric oxide and ferrous sulfide in a scale sample is determined according to performance evaluation standards by referring to a determination method for content of acid insoluble substances, phosphorus, iron, aluminum, calcium, magnesium, zinc and copper in industrial circulating cooling water scale and corrosion products (HG/T3534-2003) and a determination method for content of ferrous sulfide in industrial circulating cooling water scale and corrosion products (HG/T3534-2003); the corrosion rate of the scale remover on A3 carbon steel was determined by reference to the performance test method and evaluation standard of corrosion inhibitors for acidification (SY/T5405-1996), and the results are shown in Table 1.
And (3) evaluating the descaling efficiency of the descaling agent by adopting a gravimetric method, namely accurately weighing 5g of the dried scale sample, placing the weighed scale sample into a 100mL colorimetric tube, adding the descaling agent to the scale, and soaking at room temperature. 8 experiments are carried out on each scale sample in parallel, 1 scale sample is taken out every hour and is dried in a weighing mode, the scale samples are filtered and dried after being completely dissolved, the weight of insoluble substances is weighed, the scale removal efficiency is calculated, and the results are shown in table 2.
TABLE 1 examples 1-3 Scale samples principal Components and Scale removal Corrosion rates
| Examples | Calcium carbonate/% | Iron oxide/%) | Iron (II) sulfide/%) | Corrosion rate/g.m-2.h-1 |
| 1 | 32.27 | 1.10 | 38.75 | 0.0023 |
| 2 | 26.08 | 4.23 | 47.32 | 0.0020 |
| 3 | 30.96 | 0.85 | 35.04 | 0.0018 |
Table 2 examples 1-3 detergent descaling efficiency
The data in tables 1 and 2 show that the main components of the scale samples in examples 1 to 3 are ferrous sulfate and calcium carbonate, and the corrosion rate of the scale samples added with the scale remover to A3 carbon steel is less than 0.0023g/m2H; the dissolving speed of inorganic salt scale, ferrous sulfate and metal corrosion products is high, the inorganic salt scale, ferrous sulfate and metal corrosion products are completely dissolved in 6-8 hours, a small amount of silt is remained, the detergent is changed from colorless to yellow, and no hydrogen sulfide gas is discharged in the dissolving process.
Claims (7)
1. The scale remover for the water injection system of the oil and gas field is characterized in that: the material composition comprises the following substances in percentage by mass: 1-3% of hydrofluoric acid, 5-18% of hydrochloric acid, 2-6% of a sulfur remover, 6-10% of a metal ion chelating agent, 1-2% of an oil stain remover, 0.5-1% of a corrosion inhibitor and the balance of water; the desulfurizing agent consists of crotonic acid, chloropropionic acid and copper sulfate, and the mass ratio of the crotonic acid to the chloropropionic acid to the copper sulfate is (1-4): (0.5-1): (0.5 to 1).
2. The scale remover for oil and gas field water injection system according to claim 1, wherein: the metal ion chelating agent is amine sodium trimethoprim phosphate.
3. The scale remover for oil and gas field water injection system according to claim 1, wherein: the oil stain remover consists of diisooctyl succinate sodium sulfonate and a fluorocarbon surfactant, wherein the mass ratio of the diisooctyl succinate sodium sulfonate to the fluorocarbon surfactant is 3: 1-5: 1.
4. the scale remover for oil and gas field water injection system according to claim 1, wherein: the corrosion inhibitor is sulfonate imidazoline quaternary ammonium salt.
5. A method for preparing a scale remover for an oil and gas field water injection system is characterized by comprising the following steps:
(1) accurately measuring hydrofluoric acid, hydrochloric acid, a sulfur remover, a metal ion chelating agent, an oil dirt remover, a corrosion inhibitor and water according to the mass fraction of each medicament; firstly, adding water into a liquid preparation tank with a stirrer, starting the stirrer, adding a corrosion inhibitor under the stirring condition, sequentially adding crotonic acid, chloropropionic acid and copper sulfate after the corrosion inhibitor is completely dissolved, and continuously stirring uniformly to obtain a mixed solution I;
(2) under the condition of stirring, sequentially adding a metal ion chelating agent, hydrofluoric acid and hydrochloric acid into the mixed solution I obtained in the step (1) to obtain a mixed solution II;
(3) and (3) under the stirring condition, sequentially adding sodium diisooctyl succinate sulfonate and a fluorocarbon surfactant into the mixed solution II obtained in the step (2), and fully and uniformly stirring to obtain the scale remover for the water injection system of the oil and gas field.
6. The preparation method of the scale remover for the water injection system of the oil and gas field according to claim 5, wherein the preparation method comprises the following steps: the whole operation is carried out at normal temperature.
7. An application method of a scale remover for an oil and gas field water injection system is characterized by comprising the following steps:
(1) closing the water injection pump and the valve, and pumping the descaling agent into the water injection system pipeline and the shaft pipe column by using a pump truck;
(2) after all the scale remover is injected, the scale remover and the dirt are fully reacted (the reaction time is controlled to be 6-8 h);
(3) opening a water injection valve, starting a water injection pump, cleaning pipelines and a shaft pipe column of a water injection system by using injection water, and transporting the waste liquid discharged back to a sewage station for centralized treatment after being collected by a tank car;
(4) when the appearance of the flowback waste liquid is the same as that of the injected water and the pH value of the solution is more than 5, stopping flowback and entering a normal production running state;
preferably, the reaction time in the step (2) is 6-8 h.
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