CN110387218A - Modified calcium brine workover fluid and preparation method thereof - Google Patents
Modified calcium brine workover fluid and preparation method thereof Download PDFInfo
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- CN110387218A CN110387218A CN201910537999.6A CN201910537999A CN110387218A CN 110387218 A CN110387218 A CN 110387218A CN 201910537999 A CN201910537999 A CN 201910537999A CN 110387218 A CN110387218 A CN 110387218A
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- calcium brine
- modified calcium
- fluid
- loss additive
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 67
- 239000012267 brine Substances 0.000 title claims abstract description 64
- 239000012530 fluid Substances 0.000 title claims abstract description 57
- 150000001669 calcium Chemical class 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 239000011575 calcium Substances 0.000 claims abstract description 25
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 25
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004094 surface-active agent Substances 0.000 claims abstract description 25
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000005764 inhibitory process Effects 0.000 claims abstract description 22
- 239000004088 foaming agent Substances 0.000 claims abstract description 12
- 125000002091 cationic group Chemical group 0.000 claims abstract description 10
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 239000000654 additive Substances 0.000 claims description 41
- 230000000996 additive effect Effects 0.000 claims description 41
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 28
- 229920002472 Starch Polymers 0.000 claims description 18
- 235000019698 starch Nutrition 0.000 claims description 18
- 239000008107 starch Substances 0.000 claims description 18
- 239000011259 mixed solution Substances 0.000 claims description 16
- 229920000881 Modified starch Polymers 0.000 claims description 15
- 239000011780 sodium chloride Substances 0.000 claims description 14
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 14
- 229910021538 borax Inorganic materials 0.000 claims description 13
- 239000004328 sodium tetraborate Substances 0.000 claims description 13
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 12
- 239000012153 distilled water Substances 0.000 claims description 8
- 239000001836 Dioctyl sodium sulphosuccinate Substances 0.000 claims description 7
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 7
- 235000019329 dioctyl sodium sulphosuccinate Nutrition 0.000 claims description 7
- 229920001592 potato starch Polymers 0.000 claims description 7
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical compound [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 claims description 7
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 7
- 229920002261 Corn starch Polymers 0.000 claims description 6
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 claims description 6
- 239000008120 corn starch Substances 0.000 claims description 6
- 229940099112 cornstarch Drugs 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 238000001816 cooling 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
- 238000009835 boiling Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- 239000000460 chlorine Substances 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- FYSNRPHRLRVCSW-UHFFFAOYSA-N dodecasodium;tetraborate Chemical group [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-].[O-]B([O-])[O-] FYSNRPHRLRVCSW-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 abstract description 7
- 239000008186 active pharmaceutical agent Substances 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000000706 filtrate Substances 0.000 abstract description 2
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 239000003607 modifier Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 5
- PRPAGESBURMWTI-UHFFFAOYSA-N [C].[F] Chemical compound [C].[F] PRPAGESBURMWTI-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000003093 cationic surfactant Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 150000004675 formic acid derivatives Chemical class 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000015784 hyperosmotic salinity response Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- WWSNLNXXISONLQ-UHFFFAOYSA-N C(CCCCCCCCCCCCCCC)Cl(C)(C)C Chemical compound C(CCCCCCCCCCCCCCC)Cl(C)(C)C WWSNLNXXISONLQ-UHFFFAOYSA-N 0.000 description 1
- 244000017020 Ipomoea batatas Species 0.000 description 1
- 235000002678 Ipomoea batatas Nutrition 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- 229940123973 Oxygen scavenger Drugs 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- -1 calcium halogen Chemical class 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
Landscapes
- 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)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a modified calcium brine workover fluid and a preparation method thereof, and belongs to the technical field of oil and gas exploitation. The modified calcium brine workover fluid comprises the following components in percentage by weight: 2 to 4 percent of scale inhibition modifier, 0.5 to 1 percent of waterproof locking agent, 1 to 2 percent of filtrate reducer and the balance of calcium brine; the waterproof locking agent comprises the following components in parts by mass: 25 to 35 portions of cationic fluorocarbon surfactant, 15 to 25 portions of non-ionic fluorocarbon surfactant, 5 to 15 portions of foaming agent and 25 to 35 portions of octadecyl trimethyl ammonium chloride. The workover fluid provided by the invention has a good oil layer protection effect, the API filtration loss is less than 5ml/30min, the salt resistance can reach 600000ppm, the interfacial tension is less than 1mN/m, the core permeability recovery rate is greater than 95%, and the temperature resistance is greater than or equal to 120 ℃.
Description
Technical field
The present invention relates to oil-gas mining technical field, in particular to a kind of modified calcium brine workover fluid and preparation method thereof.
Background technique
In oilfield exploitation procedure, calcium brine workover fluid is injected usually into oil/gas well and carrys out equilibrium strata pressure, to protect
Hold Oil & Gas Productivity.Wherein, the ingredient of calcium brine mainly has calcium chloride and a small amount of calcium sulfate, magnesium chloride, sodium chloride etc..
In use, calcium brine workover fluid causes formation scaling in order to prevent, adds generally in calcium brine workover fluid
Enter scale inhibition modifying agent to be modified it.However, above-mentioned modified calcium brine workover fluid is in low permeability reservoir in use, can generate
Water blocking damage causes reservoir yield to decline.
Summary of the invention
The embodiment of the invention provides a kind of modified brine workover fluid oxygen scavenger, modified brine workover fluid and its preparation sides
Method can solve the above problem.The technical solution is as follows:
On the one hand, a kind of modified calcium brine workover fluid is provided, the modified calcium brine workover fluid includes following weight hundred
Divide the component of ratio: scale inhibition modifying agent 2%~4%, Waterproof lock agent 0.5%~1%, fluid loss additive 1%~2%, surplus are calcium halogen
Water；
Wherein, the Waterproof lock agent includes the component of following mass fraction: 25 parts of the fluorocarbon surfactant of cationic
~35 parts, 15 parts~25 parts non-ionic of fluorocarbon surfactant, 5 parts~15 parts of foaming agent, octadecyl trimethyl chlorination
25 parts~35 parts of ammonium.
In a kind of possible design, the scale inhibition modifying agent following components in percentage by weight: aminotrimethylenephosphonic acid
15%~25%, dioctyl sodium sulphosuccinate 4%~8%, hexadecyltrimethylammonium chloride 2%~3%, tributyl phosphate
0.1%~0.3%, surplus is distilled water.
In a kind of possible design, the fluid loss additive includes the component of following mass fraction: 100 parts of water, natural shallow lake
8 parts~12 parts of powder, 0.8 part~2 parts of pre-gelatinized starch, 1 part~3 parts of sodium tetraborate, 0.7 part~1 part of sodium chloride.
In a kind of possible design, the native starch is cornstarch or potato starch.
In a kind of possible design, the fluid loss additive is the particle that partial size is 1mm~4mm.
On the other hand, a kind of preparation method of modified calcium brine workover fluid as described in any one of the above embodiments is provided, it is described
Preparation method includes:
According to the weight percent of each component, scale inhibition modifying agent is added into calcium brine, and stir evenly, to form first
Mixed solution；
Waterproof lock agent is added into first mixed solution, and stirs evenly, to form the second mixed solution；
Fluid loss additive is added into second mixed solution, and stirs evenly, to obtain the modified calcium brine well workover
Liquid.
In a kind of possible design, the fluid loss additive includes the component of following mass fraction: 100 parts of water, natural shallow lake
8 parts~12 parts of powder, 0.8 part~2 parts of pre-gelatinized starch, 1 part~3 parts of sodium tetraborate, 0.7 part~1 part of sodium chloride.
In a kind of possible design, the fluid loss additive is prepared as follows acquisition:
The water of the first mass fraction is added into the first container, and is heated to boiling；
The water of the second mass fraction is added into second container, sodium tetraborate is added later, and stirs to dissolution, Zhi Houyi
Secondary addition pre-gelatinized starch and native starch, and stir to dissolving, sodium chloride is added later, and stir prevention and obtain emulsion form
Mixed solution；
The mixed solution is added in the first container, is stirred at 90 DEG C~100 DEG C until the viscosity of system reaches
To preset value, the fluid loss additive is obtained after cooling.
In a kind of possible design, the mass ratio of the water of the water of first mass fraction and second mass fraction
For 3:1.
In a kind of possible design, the preparation method of the fluid loss additive further include: be processed into the fluid loss additive
Partial size is the granular product of 0.5mm~5mm.
Technical solution bring beneficial effect provided in an embodiment of the present invention includes at least:
Modified calcium brine workover fluid provided in an embodiment of the present invention, the fluorocarbon surface by the cationic of Waterproof lock agent are living
Property agent, non-ionic fluorocarbon surfactant, foaming agent and cationic surfactant this four components synergistic effect, have
Effect reduces the interfacial tension of modified calcium brine workover fluid whole system, can make workover fluid in the low permeability reservoir smoothly row of returning, avoid
The generation of water lock phenomenon.And by fluid loss additive can by the gap plugging of reservoir, to prevent well killing fluid to formation leakage and
Influence being normally carried out for workover treatment.To sum up, the embodiment of the present invention by the composition of the raw material to modified calcium brine workover fluid and
Proportion optimizes, and has obtained a kind of construction is simple, effective high salt tolerance Waterproof lock calcium brine workover fluid.The well workover
Liquid has good oil layer protection effect, and API filtration is less than 5ml/30min, and salt resistance is up to 600000ppm, interfacial tension
Less than 1mN/m, recovery of core permeability is greater than 95%, temperature resistance >=120 DEG C.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention will be made into one below
Step ground detailed description.
On the one hand, the embodiment of the invention provides a kind of modified calcium brine workover fluid, which includes
Following components in percentage by weight: scale inhibition modifying agent 2%~4%, Waterproof lock agent 0.5%~1%, fluid loss additive 1%~2%,
Surplus is calcium brine；Wherein, Waterproof lock agent includes the component of following mass fraction: 25 parts of the fluorocarbon surfactant of cationic
~35 parts, 15 parts~25 parts non-ionic of fluorocarbon surfactant, 5 parts~15 parts of foaming agent, octadecyl trimethyl chlorination
25 parts~35 parts of ammonium.
The Waterproof lock agent that should be modified in calcium brine workover fluid below, fluid loss additive are described:
The fluorocarbon surfactant of Waterproof lock agent is to replace hydrocarbon chain as the table of non-polar group in molecule using fluorocarbon chain
The surface tension of solution can be reduced to the value of pole by face activating agent in extremely low concentration.Wherein, the fluorine carbon of cationic
Surfactant has the characteristics that excellent chemical stability, and energy high temperature resistant, acid and alkali-resistance are whole when 0.025% being added in clear water
The interfacial tension of a system is smaller than 1mN/m.Non-ionic fluorocarbon surfactant has excellent intermiscibility, in clear water
When being added 0.015%, the interfacial tension of whole system is smaller than 1mN/m.As it can be seen that the fluorocarbon surfactant for passing through cationic
With the mutual cooperation between non-ionic fluorocarbon surfactant, it can both can guarantee modified calcium brine workover fluid in high temperature height
Pressure has good chemical stability good, and the interfacial tension of modified calcium brine workover fluid whole system can also be effectively reduced, can
Make workover fluid in the reservoir smoothly row of returning, avoids the generation of water lock phenomenon.
Foaming agent can be used with fluorine carbon surfactant compound, and it is entire can to assist playing the modified calcium brine workover fluid of reduction
The effect of the interfacial tension of system returns row conducive to by the workover fluid in reservoir.
Octadecyltrimethylammonium chloride can not only be used with fluorine carbon surfactant compound, advantageously reduce modified calcium
The interfacial tension of brine workover fluid whole system, and when fluorine carbon surfactant is influenced by external condition and leads to its drop
When the interfacial tension reduced capability of low modified calcium brine workover fluid whole system, cationic surfactant can play reduction and change
The effect of the interfacial tension ability of property calcium brine workover fluid whole system.In addition, due to containing a large amount of cation in calcium brine,
Therefore workover fluid provided by the embodiment of the present invention does not select anionic surfactant, to avoid causing precipitating to damage.
Fluid loss additive water suction can expand, can be by the gap plugging of reservoir, to prevent well killing fluid to formation leakage
And influence being normally carried out for workover treatment.
Modified calcium brine workover fluid provided in an embodiment of the present invention, the fluorocarbon surface by the cationic of Waterproof lock agent are living
Property agent, non-ionic fluorocarbon surfactant, foaming agent and cationic surfactant this four components synergistic effect, have
Effect reduces the interfacial tension of modified calcium brine workover fluid whole system, can make workover fluid in the low permeability reservoir smoothly row of returning, avoid
The generation of water lock phenomenon.And by fluid loss additive can by the gap plugging of reservoir, to prevent well killing fluid to formation leakage and
Influence being normally carried out for workover treatment.To sum up, the embodiment of the present invention by the composition of the raw material to modified calcium brine workover fluid and
Proportion optimizes, and has obtained a kind of construction is simple, effective high salt tolerance Waterproof lock calcium brine workover fluid.The well workover
Liquid has good oil layer protection effect, and API filtration is less than 5ml/30min, and salt resistance is up to 600000ppm, interfacial tension
Less than 1mN/m, recovery of core permeability is greater than 95%, temperature resistance >=120 DEG C.
In the embodiment of the present invention, scale inhibition modifying agent following components in percentage by weight: aminotrimethylenephosphonic acid 15%~
25%, dioctyl sodium sulphosuccinate 4%~8%, hexadecyltrimethylammonium chloride 2%~3%, tributyl phosphate 0.1%
~0.3%, surplus is distilled water.By the way that the ingredient of scale inhibition modifying agent is as above arranged, there is scale inhibition modifying agent and prevent
Fouling performance is strong, low-consuming advantage, it may have construction is simple, the advantages of not increasing work operations amount.
In the embodiment of the present invention, foaming agent can be lauryl sodium sulfate.
In the embodiment of the present invention, fluid loss additive includes the component of following mass fraction: 100 parts of water, native starch 8 parts~12
Part, 0.8 part~2 parts of pre-gelatinized starch, 1 part~3 parts of sodium tetraborate, 0.7 part~1 part of sodium chloride.By the way that filtrate reducing is as above arranged
The ingredient of agent enables the leak stopping rate of fluid loss additive to reach 85% or more, and resume permeability rate can reach 95% or more, resists
Salt is up to 60 × 104Mg/L can satisfy well workover requirement.
Wherein, the effect of each component of above-mentioned fluid loss additive is as follows:
Water is as solvent.In the embodiment of the present invention, water is specifically as follows tap water, distilled water, deionized water etc., from cost
Angle consideration, preferably tap water.
Native starch is as cross-linking monomer.In the embodiment of the present invention, native starch refer to directly extract to obtain from nature,
Starch without any chemistry or physical modification.According to source difference, native starch can be divided into cornstarch, potato starch,
Starch from sweet potato, green starch etc..From the aspect of cost, the preferred cornstarch of the embodiment of the present invention or potato starch.
Pre-gelatinized starch is physically modified starch.In embodiments of the present invention, pre-gelatinized starch is on the one hand single as crosslinking
Body and native starch are cross-linked to form the main body of fluid loss additive, on the other hand for assisting starch dissolution.
Sodium tetraborate is also referred to as borax, and it acts as crosslinking agents.In the embodiment of the present invention, sodium tetraborate can be sodium tetraborate
Decahydrate, be also possible to lose the sodium tetraborate of some or all of crystallization water.
Sodium chloride is used as cross-linking aid in embodiments of the present invention.
Further, fluid loss additive provided in an embodiment of the present invention can be the particle that partial size is 1mm~4mm.
In the embodiment of the present invention, the density of calcium brine is 1.26g/cm3~1.45g/cm3.Wherein, calcium brine mainly with
Calcium chloride is formulated, if the density of calcium brine is in 1.45g/cm3More than, calcium brine is prepared with calcium chloride at this time,
It needs to prepare using formates, formates can prepare the calcium brine of different densities, and highest can achieve 1.65g/cm3, but
It is that formates preparation cost is very high, in order to control cost, cost can be saved to 90%.
On the other hand, the embodiment of the invention also provides a kind of preparation method of modified brine workover fluid, the preparation methods
The following steps are included:
Step S1 scale inhibition modifying agent is added into calcium brine, and stir evenly according to the weight percent of each component, with
Form the first mixed solution；
Waterproof lock agent is added into the first mixed solution, and stirs evenly by step S2, to form the second mixed solution；
Fluid loss additive is added into the second mixed solution, and stirs evenly by step S3, to obtain modified calcium brine well workover
Liquid.
Wherein, fluid loss additive includes the component of following mass fraction: 100 parts of water, 8 parts of native starch~12 parts, pre-gelatinized
0.8 part~2 parts of starch, 1 part~3 parts of sodium tetraborate, 0.7 part~1 part of sodium chloride.
Fluid loss additive based on said components, fluid loss additive can be prepared as follows acquisition, specifically include following step
It is rapid:
Step a, the water of the first mass fraction is added into the first container, and is heated to boiling；
The water of the second mass fraction is added into second container by step b, and sodium tetraborate is added later, and stirs to dissolution,
Pre-gelatinized starch and native starch are sequentially added later, and is stirred to dissolving, and sodium chloride are added later, and stir prevention and obtain cream
The mixed solution of liquid；
The mixed solution is added in the first container step c, stirs at 90 DEG C~100 DEG C up to system
Viscosity reaches preset value, and the fluid loss additive is obtained after cooling.
Further, in the embodiment of the present invention, the mass ratio of the water of the water of the first mass fraction and the second mass fraction can
Think 3:1.
Further, in the embodiment of the present invention, in step c, reaction system can be made to stir to " stick together shape ", i.e. viscosity pole
Greatly, noncurrent state.The product obtained after default viscosity number can be up to be poured on the ground for being covered with plastic paper, make it
Natural cooling.
It further, can be the following steps are included: fluid loss additive be processed into after step c in the embodiment of the present invention
Partial size is the granular product of 0.5mm~5mm.Specifically, it can be processed by pelletizer.
Hereinafter the present invention will be further described through by specific embodiment.
In following specific embodiments, condition person is not specified in related operation, according to normal conditions or manufacturer
It is recommended that condition carry out.It is raw materials used production firm is not specified and specification person be can be with conventional products that are commercially available.
Wherein, calcium brine, distilled water are laboratory configuration, and aminotrimethylenephosphonic acid marches forward industry purchased from Chancheng District of Foshan City
Water treatment additive factory, dioctyl sodium sulphosuccinate are purchased from Guangzhou Zhen Lin trade Co., Ltd, cetyl trimethyl chlorine
Change ammonium and be purchased from Shanghai Jin Min Fine Chemical Co., Ltd, tributyl phosphate is purchased from Guangzhou Zhong Jie Chemical Industry Science Co., Ltd, sun
The fluorocarbon surfactant of ionic, non-ionic fluorocarbon surfactant, foaming agent are purchased from Henan Xinxiang morning in spring environmental protection skill
Art Co., Ltd, octadecyltrimethylammonium chloride are purchased from Linyi Lan Ke Fine Chemical Co., Ltd, potato starch, cornstarch
Purchased from Hebei Yan Xing Chemical Co., Ltd., pre-gelatinized starch is purchased from Tianjin purchased from the odd Chemical Co., Ltd. in Jinan thousand, sodium tetraborate
Extra large Tonghua work International Trading Company Ltd, sodium chloride reach development in science and technology Co., Ltd purchased from Tianjin Huimin.
Embodiment 1
Present embodiments provide a kind of modified calcium brine workover fluid, preparation method are as follows: density is added in beaker first
For 1.26g/cm3And the calcium brine that mass fraction is 94 parts, mass fraction is then added and is 4 parts of scale inhibition modifying agent, and stirs
Uniformly.Continue to be added mass fraction into beaker as 1 part of Waterproof lock agent, and stirs evenly.Continue that quality is added into beaker
Number is 1 part of fluid loss additive, and stirs evenly, to obtain modified calcium brine workover fluid
Wherein, Waterproof lock agent includes the component of following mass fraction: 25 parts of the fluorocarbon surfactant of cationic, it is non-from
35 parts of 15 parts of 25 parts of fluorocarbon surfactant, the foaming agent of subtype, octadecyltrimethylammonium chloride.
Scale inhibition modifying agent following components in percentage by weight: aminotrimethylenephosphonic acid 18%, dioctyl sodium sulphosuccinate
4%, hexadecyltrimethylammonium chloride 2%, tributyl phosphate 0.1%, surplus are distilled water.
Fluid loss additive includes the component of following mass fraction: 100 parts of water, 8 parts of potato starch, 1 part of pre-gelatinized starch, four boron
3 parts of sour sodium, 1 part of sodium chloride.
Through measuring, the interfacial tension of modified calcium brine workover fluid provided by the present embodiment is 0.8697mN/m, scale inhibition performance
Greater than 93%, salt resistance is up to 280000ppm.
Embodiment 2
Present embodiments provide a kind of modified calcium brine workover fluid, preparation method are as follows: density is added in beaker first
For 1.30g/cm3And the calcium brine that mass fraction is 93 parts, mass fraction is then added and is 4 parts of scale inhibition modifying agent, and stirs
Uniformly.Continue to be added mass fraction into beaker as 1 part of Waterproof lock agent, and stirs evenly.Continue that quality is added into beaker
Number is 2 parts of fluid loss additive, and stirs evenly, to obtain modified calcium brine workover fluid
Wherein, Waterproof lock agent includes the component of following mass fraction: 35 parts of the fluorocarbon surfactant of cationic, it is non-from
35 parts of 5 parts of 25 parts of fluorocarbon surfactant, the foaming agent of subtype, octadecyltrimethylammonium chloride.
Scale inhibition modifying agent following components in percentage by weight: aminotrimethylenephosphonic acid 20%, dioctyl sodium sulphosuccinate
5%, hexadecyltrimethylammonium chloride 2%, tributyl phosphate 0.2%, surplus are distilled water.
Fluid loss additive includes the component of following mass fraction: 100 parts of water, 10 parts of cornstarch, 2 parts of pre-gelatinized starch, four
2 parts of Boratex, 1 part of sodium chloride.
Through measuring, the interfacial tension of modified calcium brine workover fluid provided by the present embodiment is 0.6647mN/m, scale inhibition performance
Greater than 93%, salt resistance is up to 380000ppm.
Embodiment 3
Present embodiments provide a kind of modified calcium brine workover fluid, preparation method are as follows: density is added in beaker first
For 1.40g/cm3And the calcium brine that mass fraction is 95 parts, mass fraction is then added and is 3 parts of scale inhibition modifying agent, and stirs
Uniformly.Continue to be added mass fraction into beaker as 1 part of Waterproof lock agent, and stirs evenly.Continue that quality is added into beaker
Number is 2 parts of fluid loss additive, and stirs evenly, to obtain modified calcium brine workover fluid
Wherein, Waterproof lock agent includes the component of following mass fraction: 35 parts of the fluorocarbon surfactant of cationic, it is non-from
25 parts of 15 parts of 25 parts of fluorocarbon surfactant, the foaming agent of subtype, octadecyltrimethylammonium chloride.
Scale inhibition modifying agent following components in percentage by weight: aminotrimethylenephosphonic acid 25%, dioctyl sodium sulphosuccinate
6%, hexadecyltrimethylammonium chloride 3%, tributyl phosphate 0.3%, surplus are distilled water.
Fluid loss additive includes the component of following mass fraction: 100 parts of water, 8 parts of potato starch, 2 parts of pre-gelatinized starch, four boron
3 parts of sour sodium, 1 part of sodium chloride.
Through measuring, the interfacial tension of modified calcium brine workover fluid provided by the present embodiment is 0.4327mN/m, scale inhibition performance
Greater than 93%, salt resistance is up to 600000ppm.
All the above alternatives can form the alternative embodiment of the disclosure, herein no longer using any combination
It repeats one by one.
The foregoing is merely illustrative embodiments of the invention, the protection scope being not intended to limit the invention is all at this
Within the spirit and principle of invention, any modification, equivalent replacement, improvement and so on should be included in protection model of the invention
Within enclosing.
Claims (10)
1. a kind of modified calcium brine workover fluid, which is characterized in that the modified calcium brine workover fluid includes following weight percent
Component: scale inhibition modifying agent 2%~4%, Waterproof lock agent 0.5%~1%, fluid loss additive 1%~2%, surplus be calcium brine；
Wherein, the Waterproof lock agent includes the component of following mass fraction: the fluorocarbon surfactant 25 parts~35 of cationic
Part, 15 parts~25 parts non-ionic of fluorocarbon surfactant, 5 parts~15 parts of foaming agent, octadecyltrimethylammonium chloride 25
Part~35 parts.
2. modified calcium brine workover fluid according to claim 1, which is characterized in that the following weight hundred of scale inhibition modifying agent
Divide the component of ratio: aminotrimethylenephosphonic acid 15%~25%, dioctyl sodium sulphosuccinate 4%~8%, cetyl trimethyl
Ammonium chloride 2%~3%, tributyl phosphate 0.1%~0.3%, surplus are distilled water.
3. modified calcium brine workover fluid according to claim 1, which is characterized in that the fluid loss additive includes following quality
The component of number: 100 parts of water, 8 parts~12 parts of native starch, 0.8 part~2 parts of pre-gelatinized starch, 1 part of sodium tetraborate~3 parts, chlorine
Change 0.7 part~1 part of sodium.
4. modified calcium brine workover fluid according to claim 3, which is characterized in that the native starch be cornstarch or
Potato starch.
5. modified calcium brine workover fluid according to claim 3 or 4, which is characterized in that the fluid loss additive is that partial size is
The particle of 1mm~4mm.
6. a kind of preparation method of modified calcium brine workover fluid as claimed in any one of claims 1 to 5, which is characterized in that institute
Stating preparation method includes:
According to the weight percent of each component, scale inhibition modifying agent is added into calcium brine, and stir evenly, to form the first mixing
Solution；
Waterproof lock agent is added into first mixed solution, and stirs evenly, to form the second mixed solution；
Fluid loss additive is added into second mixed solution, and stirs evenly, to obtain the modified calcium brine workover fluid.
7. preparation method according to claim 6, which is characterized in that the fluid loss additive includes the group of following mass fraction
Point: 100 parts of water, 8 parts~12 parts of native starch, 0.8 part~2 parts of pre-gelatinized starch, 1 part~3 parts of sodium tetraborate, sodium chloride 0.7
Part~1 part.
8. preparation method according to claim 7, which is characterized in that the fluid loss additive, which is prepared as follows, to be obtained
It takes:
The water of the first mass fraction is added into the first container, and is heated to boiling；
The water of the second mass fraction is added into second container, sodium tetraborate is added later, and stirs to dissolving, successively adds later
Enter pre-gelatinized starch and native starch, and stir to dissolving, sodium chloride is added later, and stirs prevention and obtain the mixing of emulsion form
Solution；
The mixed solution is added in the first container, is stirred at 90 DEG C~100 DEG C until the viscosity of system reaches pre-
If value obtains the fluid loss additive after cooling.
9. preparation method according to claim 8, which is characterized in that the water of first mass fraction and second matter
The mass ratio for measuring the water of number is 3:1.
10. preparation method according to claim 8, which is characterized in that the preparation method of the fluid loss additive further include: will
The fluid loss additive is processed into the granular product that partial size is 0.5mm~5mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023205672A1 (en) * | 2022-04-19 | 2023-10-26 | Saudi Arabian Oil Company | Scale inhibitor fluid and method for inhibiting scale formation |
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| US20050145135A1 (en) * | 2003-02-26 | 2005-07-07 | Halliburton Energy Services, Inc. | Methods and compositions for sealing subterranean zones |
| CN104927830A (en) * | 2015-06-15 | 2015-09-23 | 中国石油集团西部钻探工程有限公司 | Waterproof lock fracturing fluid and preparation method thereof |
| CN109385258A (en) * | 2017-08-08 | 2019-02-26 | 中国石油天然气股份有限公司 | Modified brine workover fluid and preparation method thereof |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050145135A1 (en) * | 2003-02-26 | 2005-07-07 | Halliburton Energy Services, Inc. | Methods and compositions for sealing subterranean zones |
| CN104927830A (en) * | 2015-06-15 | 2015-09-23 | 中国石油集团西部钻探工程有限公司 | Waterproof lock fracturing fluid and preparation method thereof |
| CN109385258A (en) * | 2017-08-08 | 2019-02-26 | 中国石油天然气股份有限公司 | Modified brine workover fluid and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023205672A1 (en) * | 2022-04-19 | 2023-10-26 | Saudi Arabian Oil Company | Scale inhibitor fluid and method for inhibiting scale formation |
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