CN114106803A - Oil well slow-speed descaling antiscaling agent and preparation and use methods thereof - Google Patents
Oil well slow-speed descaling antiscaling agent and preparation and use methods thereof Download PDFInfo
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- CN114106803A CN114106803A CN202111405624.8A CN202111405624A CN114106803A CN 114106803 A CN114106803 A CN 114106803A CN 202111405624 A CN202111405624 A CN 202111405624A CN 114106803 A CN114106803 A CN 114106803A
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- 239000003129 oil well Substances 0.000 title claims abstract description 84
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229920000642 polymer Polymers 0.000 claims abstract description 17
- -1 dodecyl ethoxy sulfobetaine Chemical compound 0.000 claims abstract description 16
- 239000004094 surface-active agent Substances 0.000 claims abstract description 16
- 230000002195 synergetic effect Effects 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000010452 phosphate Substances 0.000 claims abstract description 13
- 229940117986 sulfobetaine Drugs 0.000 claims abstract description 13
- 239000011259 mixed solution Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 28
- 230000002265 prevention Effects 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- JSYPRLVDJYQMAI-TYYBGVCCSA-N (e)-but-2-enedioic acid;prop-2-enoic acid Chemical compound OC(=O)C=C.OC(=O)\C=C\C(O)=O JSYPRLVDJYQMAI-TYYBGVCCSA-N 0.000 claims description 4
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 125000005211 alkyl trimethyl ammonium group Chemical group 0.000 claims description 3
- GZOWLNNGTRYBDH-UHFFFAOYSA-N 2,3,4,5-tetrafluoro-6-(1,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-heptadecafluoronon-1-enoxy)benzenesulfonic acid Chemical compound FC=1C(=C(C(=C(C=1F)F)F)S(=O)(=O)O)OC(=C(C(C(C(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)(F)F)F)F GZOWLNNGTRYBDH-UHFFFAOYSA-N 0.000 claims description 2
- 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 2
- BEGBSFPALGFMJI-UHFFFAOYSA-N ethene;sodium Chemical group [Na].C=C BEGBSFPALGFMJI-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 16
- 238000007689 inspection Methods 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 11
- 239000000839 emulsion Substances 0.000 abstract description 3
- 239000012188 paraffin wax Substances 0.000 abstract description 3
- 230000035484 reaction time Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 230000000979 retarding effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000008398 formation water Substances 0.000 description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 229940120146 EDTMP Drugs 0.000 description 2
- 239000002519 antifouling agent Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000002455 scale inhibitor Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- NIAGBSSWEZDNMT-UHFFFAOYSA-M tetraoxidosulfate(.1-) Chemical compound [O]S([O-])(=O)=O NIAGBSSWEZDNMT-UHFFFAOYSA-M 0.000 description 1
- 238000005406 washing Methods 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
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention relates to the technical field of oil well anti-scaling agents, in particular to an oil well slow-speed scale removal anti-scaling agent and a preparation and use method thereof, wherein the oil well slow-speed scale removal anti-scaling agent comprises 30-35% of a polymer anti-scaling main agent, 2-5% of dodecyl ethoxy sulfobetaine, 5-10% of citric acid, 2-5% of a synergistic surfactant, 3-5% of organic phosphate and the balance of water in percentage by mass. The oil well slow-speed descaling antiscaling agent disclosed by the invention is simple in preparation process, mild in operation condition and short in reaction time, and can effectively inhibit and remove calcium sulfate scale and improve the oil well antiscaling and descaling rate. The density emulsion paraffin remover in the oil well is applied to the field, the effective rate is 100 percent, and the pump inspection period can be prolonged by over 108 days.
Description
Technical Field
The invention relates to the technical field of oil well scale inhibitors, in particular to a slow-speed scale removal scale inhibitor for an oil well and a preparation and use method thereof.
Background
At present, as oil field development enters a later stage, water content rises, injected water and formation water are incompatible, and the like, so that oil well scaling becomes a common phenomenon and becomes serious day by day.
Taking an oil well in a certain well area of a Clarity oil field as an example, the scaling trend of the oil well is obvious in the process of pump inspection in nearly three years, 45% of inspection pump wells have serious scaling, 60% of pump blocking wells cause pump blocking after scale falls off and enters a pump cylinder, the unblocking treatment effect after pump blocking is not obvious, the success rate is low, and finally, the production of the oil well can be recovered only by repairing the well and inspecting the pump. After research, the main reasons are as follows: on one hand, the well zone formation water has the calcium ion content as high as 2000mg/L, and the calcium ion content is easy to separate out in a well; on the other hand, the formation water of the zone where the Cramayi oil field well zone is located is high in sulfate radical ion content, and the well entering fluid is incompatible with the formation water, so that the well washing fluid reacts with calcium ions after entering the oil well to produce a large amount of calcium sulfate scale which is difficult to remove, and meanwhile, the high-temperature well entering fluid aggravates the generation of the scale. The analysis data of the scale sample components show that the calcium sulfate scale accounts for 13.5 percent, which is obviously higher than other blocks. In recent years, measures such as chemical scale prevention and removal are carried out on the block oil well, but no obvious effect is obtained. The main reasons are that the effective concentration is obviously reduced after the chemical intermittent dosing descaling and antiscaling is put into a well, the effective concentration is quickly discharged out of a shaft, the action time is short, and meanwhile, the scaling condition and components of the block are not systematically analyzed, so that the pertinence of the medicament is not strong; the chemical continuous dosing descaling and scale prevention cost is high, a certain effect can be achieved, but the input and output are not in direct proportion, and the economic effect is not good; therefore, the slow descaling antiscaling agent with strong pertinence and high cost performance for the oil well is urgently needed to be developed, so that the dirt in the shaft can be removed, and the well lying rate of the oil well due to the dirt can be reduced.
Disclosure of Invention
The invention provides a slow-speed descaling antiscaling agent for an oil well, and a preparation method and a use method thereof, overcomes the defects of the prior art, and can effectively solve the problem of descaling and antiscaling of the existing oil well calcium sulfate scale.
One of the technical schemes of the invention is realized by the following measures: the raw materials of the oil well slow descaling antiscaling agent comprise, by mass, 30% to 35% of a polymer antiscaling main agent, 2% to 5% of dodecyl ethoxy sulfobetaine, 5% to 10% of citric acid, 2% to 5% of a synergistic surfactant, 3% to 5% of an organic phosphate, and the balance of water.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the oil well slow-speed descaling antiscaling agent is obtained by the following method:
firstly, mixing water with required amount with a polymer scale prevention main agent, and stirring for 45-70 min to obtain a first mixed solution; secondly, adding dodecyl ethoxy sulfobetaine and a synergistic surfactant dropwise into the first mixed solution, and stirring for 10min to 20min to obtain a second mixed solution; and step three, adding citric acid and organic phosphate into the second mixed solution, and stirring for 20-40 min to obtain the oil well slow-speed descaling antiscaling agent.
The polymer anti-scaling main agent is a mixture of fumaric acid-acrylic acid copolymer and ethylene diamine tetramethylene phosphonic acid sodium in a mass ratio of 5: 1.
The synergistic surfactant is a mixture of perfluorononenoxybenzene sodium sulfonate and alkyl trimethyl ammonium salt in a mass ratio of 2: 1.
The stirring in the first step and the third step is carried out at a temperature of 30 ℃ to 50 ℃.
The second technical scheme of the invention is realized by the following measures: a preparation method of the oil well slow-speed descaling antiscaling agent in the technical scheme comprises the following steps: firstly, mixing water with required amount with a polymer scale prevention main agent, and stirring for 45-70 min to obtain a first mixed solution; secondly, adding dodecyl ethoxy sulfobetaine and a synergistic surfactant dropwise into the first mixed solution, and stirring for 10min to 20min to obtain a second mixed solution; and step three, adding citric acid and organic phosphate into the second mixed solution, and stirring for 20-40 min to obtain the oil well slow-speed descaling antiscaling agent.
The third technical scheme of the invention is realized by the following measures: the use method of the oil well slow-speed descaling antiscaling agent in the technical scheme comprises the following steps: adding the oil well slow descaling antiscaling agent into the air of an oil sleeve, circulating the agent between the oil sleeve for 24-48 hours along with produced liquid, and recovering the normal production process flow after the circulation is finished, wherein the dosage of each time is 100-150 kg, and the interval dosing time is 40-50 days.
The oil well slow-speed descaling antiscaling agent disclosed by the invention is simple in preparation process, mild in operation condition and short in reaction time, and can effectively inhibit and remove calcium sulfate scale and improve the oil well antiscaling and descaling rate. The density emulsion paraffin remover in the oil well is applied to the field, the effective rate is 100 percent, and the pump inspection period can be prolonged by over 108 days.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention. The various chemical reagents and chemical articles mentioned in the invention are all the chemical reagents and chemical articles which are well known and commonly used in the prior art, unless otherwise specified; the percentages in the invention are mass percentages unless otherwise specified; the normal temperature and room temperature in the present invention generally mean a temperature of 15 ℃ to 25 ℃, and are generally defined as 25 ℃.
The invention is further described below with reference to the following examples:
example 1:
the oil well and oil well slow-speed descaling antiscaling agent comprises, by mass, 30% to 35% of a polymer antiscaling main agent, 2% to 5% of dodecyl ethoxy sulfobetaine, 5% to 10% of citric acid, 2% to 5% of a synergistic surfactant, 3% to 5% of an organic phosphate, and the balance of water.
Example 2:
as optimization of the embodiment, the oil well retarding descaling antiscaling agent is obtained by the following method: firstly, mixing water with required amount with a polymer scale prevention main agent, and stirring for 45-70 min to obtain a first mixed solution; secondly, adding dodecyl ethoxy sulfobetaine and a synergistic surfactant dropwise into the first mixed solution, and stirring for 10min to 20min to obtain a second mixed solution; and step three, adding citric acid and organic phosphate into the second mixed solution, and stirring for 20-40 min to obtain the oil well slow-speed descaling antiscaling agent.
Example 3:
as optimization of the above example, the polymer scale control main agent is a mixture of fumaric acid-acrylic acid copolymer and sodium ethylene diamine tetramethylene thiophosphonate with the mass ratio of 5: 1.
Example 4:
as an optimization of the above example, the synergistic surfactant is a mixture of sodium perfluorononenoxybenzenesulfonate and alkyltrimethylammonium salt in a mass ratio of 2: 1.
Example 5:
as an optimization of the above examples, the stirring in the first and third steps is carried out at a temperature of 30 ℃ to 50 ℃.
The invention aims at calcium sulfate in an oil well, and the fumaric acid-acrylic acid copolymer and the ethylene diamine tetramethylene phosphonic acid sodium are used as main polymer scale prevention agent components, so that calcium sulfate scale can be effectively inhibited and removed, and the scale prevention and removal rate of the oil well is improved.
Example 6:
the use method of the oil well slow descaling antiscaling agent comprises the following steps: adding the oil well slow descaling antiscaling agent into the air of an oil sleeve, circulating the agent between the oil sleeve for 24-48 hours along with produced liquid, and recovering the normal production process flow after the circulation is finished, wherein the dosage of each time is 100-150 kg, and the interval dosing time is 40-50 days.
Example 7: the oil well slow-speed descaling antiscaling agent is prepared by the following preparation method: firstly, adding 174g of water and 90g of polymer scale prevention main agent into a four-mouth bottle with a thermometer and a stirrer, and stirring for 60min at the temperature of 40 ℃ to obtain a first mixed solution; secondly, dripping 6g of dodecyl ethoxy sulfobetaine and 6g of synergistic surfactant into the first mixed solution, and stirring for 10min to obtain a second mixed solution; and thirdly, adding 15g of citric acid and 9g of organic phosphate into the second mixed solution, and stirring for 30min at the temperature of 40 ℃ to obtain the oil well slow descaling antiscale agent.
Example 8: the oil well slow-speed descaling antiscaling agent is prepared by the following preparation method: firstly, adding 150g of water into a four-mouth bottle with a thermometer and a stirrer, adding 105g of a polymer scale prevention main agent, and stirring for 60min at the temperature of 40 ℃ to obtain a first mixed solution; secondly, 15g of dodecyl ethoxy sulfobetaine and 6g of synergistic surfactant are dripped into the first mixed solution and stirred for 15min to obtain a second mixed solution; and thirdly, adding 15g of citric acid and 9g of organic phosphate into the second mixed solution, and stirring for 30min at the temperature of 40 ℃ to obtain the oil well slow descaling antiscale agent.
Example 9: the oil well slow-speed descaling antiscaling agent is prepared by the following preparation method: step one, adding 120g of water into a four-mouth bottle with a thermometer and a stirrer, adding 105g of a polymer scale prevention main agent, and stirring for 45min at the temperature of 50 ℃ to obtain a first mixed solution; secondly, 15g of dodecyl ethoxy sulfobetaine and 15g of synergistic surfactant are dripped into the first mixed solution and stirred for 10min to obtain a second mixed solution; and thirdly, adding 30g of citric acid and 15g of organic phosphate into the second mixed solution, and stirring for 30min at the temperature of 45 ℃ to obtain the oil well slow descaling antiscale agent.
Example 10: the oil well slow-speed descaling antiscaling agent is prepared by the following preparation method: step one, adding 120g of water into a four-mouth bottle with a thermometer and a stirrer, adding 90g of a polymer scale prevention main agent, and stirring for 60min at the temperature of 50 ℃ to obtain a first mixed solution; secondly, dripping 12g of dodecyl ethoxy sulfobetaine and 12g of synergistic surfactant into the first mixed solution, and stirring for 15min to obtain a second mixed solution; and thirdly, adding 24g of citric acid and 12g of organic phosphate into the second mixed solution, and stirring for 40min at the temperature of 45 ℃ to obtain the oil well slow descaling antiscale agent.
Example 11 the oil well retarding scale removal anti-scaling agent is implemented on site according to the following using method: 100kg of the oil well slow-speed descaling antiscaling agent of the example 7 is added into the air of an oil well oil sleeve, the related production process flow of the oil well is adjusted, the agent circularly reacts for 24 hours between the oil sleeves along with produced liquid, the normal production process flow is recovered after the circulation is finished, and the interval dosing time is 40 days. After construction, the production dynamics of an oil well is continuously tracked, and the pump inspection period of a 5D2280 well is prolonged to 385 days from 240 days before the implementation of the slow descaling antiscaling agent for the oil well, and the pump inspection period is prolonged to 145 days.
Example 12 the oil well retarding scale removal anti-scaling agent is implemented on site according to the following using method: 120kg of the oil well slow-speed descaling antiscaling agent of the example 8 is added into the air of an oil well oil sleeve, the related production process flow of the oil well is adjusted, the agent circularly reacts for 36 hours between the oil sleeves along with produced liquid, the normal production process flow is recovered after the circulation is finished, and the interval dosing time is 45 days. After construction, the production dynamic of an oil well is continuously tracked, and the pump inspection period of a 5D2222 well is prolonged from 353 days before the implementation of the slow descaling antiscaling agent for the oil well to 476 days, and the pump inspection period is prolonged to 123 days.
Example 13, the oil well retarding scale removal anti-fouling agent is implemented on site according to the following using method: 150kg of the oil well slow-speed descaling antiscaling agent of the example 9 is added into the air of an oil well oil sleeve, the related production process flow of the oil well is adjusted, the agent circularly reacts for 48 hours between the oil sleeves along with the produced fluid, the normal production process flow is recovered after the circulation is finished, and the interval dosing time is 50 days. The production dynamic of the oil well is continuously tracked after construction, and the pump inspection period of 56039 wells is prolonged from 315 days before the oil well is implemented with the slow descaling antiscaling agent to 423 days, and the pump inspection period is prolonged to 108 days.
Example 14, the oil well retarding scale removal anti-fouling agent is implemented on site according to the following using method: 100kg of the oil well slow-speed descaling antiscaling agent in the embodiment 10 is added into the air of an oil well oil sleeve, the related production process flow of the oil well is adjusted, the agent circularly reacts for 32 hours between the oil sleeves along with produced liquid, the normal production process flow is recovered after the circulation is finished, and the interval dosing time is 50 days. The production dynamic of the oil well is continuously tracked after construction, and the pump inspection period of 56123 wells is prolonged from 382 days before the oil well is implemented with the slow descaling antiscaling agent to 501 days, and the pump inspection period is prolonged to 139 days.
In conclusion, the oil well slow-speed descaling antiscaling agent disclosed by the invention is simple in preparation process, mild in operation condition and short in reaction time, and can be used for effectively inhibiting and removing calcium sulfate scale and improving the oil well antiscaling and descaling rate. The density emulsion paraffin remover in the oil well is applied to the field, the effective rate is 100 percent, and the pump inspection period can be prolonged by over 108 days.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (7)
1. The slow descaling antiscaling agent for oil well features that its material composition includes polymer antiscaling main agent 30-35 wt%, dodecyl ethoxy sulfobetaine 2-5 wt%, citric acid 5-10 wt%, synergistic surfactant 2-5 wt%, organic phosphate 3-5 wt% and water for the rest.
2. The oil well slow-speed descaling antiscaling agent according to claim 1, which is obtained by the following method: firstly, mixing water with required amount with a polymer scale prevention main agent, and stirring for 45-70 min to obtain a first mixed solution; secondly, adding dodecyl ethoxy sulfobetaine and a synergistic surfactant dropwise into the first mixed solution, and stirring for 10min to 20min to obtain a second mixed solution; and step three, adding citric acid and organic phosphate into the second mixed solution, and stirring for 20-40 min to obtain the oil well slow-speed descaling antiscaling agent.
3. The oil well slow-speed scale removal and prevention agent as claimed in claim 1 or 2, wherein the polymer scale prevention main agent is a mixture of fumaric acid-acrylic acid copolymer and sodium ethylene diamine tetramethylene thiophosphonate in a mass ratio of 5: 1.
4. The oil well slow-speed scale removal and prevention agent as claimed in any one of claims 1 to 3, wherein the synergistic surfactant is a mixture of sodium perfluorononenoxybenzene sulfonate and alkyl trimethyl ammonium salt in a mass ratio of 2: 1.
5. The oil well slow-speed scale removal and prevention agent as claimed in any one of claims 2 to 4, wherein the stirring in the first and third steps is carried out at a temperature of 30 ℃ to 50 ℃.
6. A method for preparing the oil well slow-speed descaling antiscaling agent according to claim 1, 3, 4 or 5, characterized by comprising the following steps: the preparation method of the oil well slow descaling antiscaling agent is carried out according to the following method: firstly, mixing water with required amount with a polymer scale prevention main agent, and stirring for 45-70 min to obtain a first mixed solution; secondly, adding dodecyl ethoxy sulfobetaine and a synergistic surfactant dropwise into the first mixed solution, and stirring for 10min to 20min to obtain a second mixed solution; and step three, adding citric acid and organic phosphate into the second mixed solution, and stirring for 20-40 min to obtain the oil well slow-speed descaling antiscaling agent.
7. The use method of the oil well slow-speed descaling antiscaling agent according to any one of claims 1 to 5, characterized by comprising the following steps: adding the oil well slow descaling antiscaling agent into the air of an oil sleeve, circulating the agent between the oil sleeve for 24-48 hours along with produced liquid, and recovering the normal production process flow after the circulation is finished, wherein the dosage of each time is 100-150 kg, and the interval dosing time is 40-50 days.
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| CN111217459A (en) * | 2018-11-23 | 2020-06-02 | 中国石油天然气股份有限公司 | Scale inhibitor composition, scale inhibitor and preparation method of scale inhibitor |
| CN110791269A (en) * | 2019-09-30 | 2020-02-14 | 四川树霖科技有限公司 | Environment-friendly supermolecule injection increasing agent and preparation method thereof |
| CN111137991A (en) * | 2020-03-23 | 2020-05-12 | 克拉玛依翎昊科技有限责任公司 | Corrosion and scale inhibition bactericide and application thereof |
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