CN106905936B - A kind of substitution CaCl2Alkaline completion fluid and preparation method thereof - Google Patents
A kind of substitution CaCl2Alkaline completion fluid and preparation method thereof Download PDFInfo
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- CN106905936B CN106905936B CN201710074054.6A CN201710074054A CN106905936B CN 106905936 B CN106905936 B CN 106905936B CN 201710074054 A CN201710074054 A CN 201710074054A CN 106905936 B CN106905936 B CN 106905936B
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- 239000012530 fluid Substances 0.000 title claims abstract description 49
- 238000006467 substitution reaction Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical class CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 31
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000001110 calcium chloride Substances 0.000 claims abstract description 21
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 16
- 239000003112 inhibitor Substances 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 10
- -1 polyethylene Polymers 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 24
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 17
- 239000000661 sodium alginate Substances 0.000 claims description 14
- 235000010413 sodium alginate Nutrition 0.000 claims description 14
- 229940005550 sodium alginate Drugs 0.000 claims description 14
- 229920000768 polyamine Polymers 0.000 claims description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 7
- 229920000881 Modified starch Polymers 0.000 claims description 7
- 239000004368 Modified starch Substances 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 7
- 235000019426 modified starch Nutrition 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 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 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229920001308 poly(aminoacid) Polymers 0.000 claims description 4
- 108010064470 polyaspartate Proteins 0.000 claims description 4
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 3
- MDFFNEOEWAXZRQ-UHFFFAOYSA-N aminyl Chemical compound [NH2] MDFFNEOEWAXZRQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 2
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical class NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 2
- 108010020346 Polyglutamic Acid Proteins 0.000 claims description 2
- 108010039918 Polylysine Proteins 0.000 claims description 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- 229920002643 polyglutamic acid Polymers 0.000 claims description 2
- 229920000656 polylysine Polymers 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 2
- 229960001124 trientine Drugs 0.000 claims description 2
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims 1
- 150000004985 diamines Chemical class 0.000 claims 1
- 239000012267 brine Substances 0.000 abstract description 14
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 14
- 230000011218 segmentation Effects 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 13
- 239000000243 solution Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003643 water by type Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- HRWYHCYGVIJOEC-UHFFFAOYSA-N 2-(octoxymethyl)oxirane Chemical compound CCCCCCCCOCC1CO1 HRWYHCYGVIJOEC-UHFFFAOYSA-N 0.000 description 2
- 241001474374 Blennius Species 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 125000003976 glyceryl group Chemical group [H]C([*])([H])C(O[H])([H])C(O[H])([H])[H] 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 229920005573 silicon-containing polymer Polymers 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003471 mutagenic agent Substances 0.000 description 1
- 231100000707 mutagenic chemical Toxicity 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000012224 working solution Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—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
-
- 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
- C09K8/10—Cellulose or derivatives thereof
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- 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)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a kind of substitution CaCl2Alkaline completion fluid and preparation method thereof, which includes 30~70% potassium carbonate based on mass fraction, 1~3% hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1% defoaming agent and the water of surplus；By using hydrophobically modified sodium alginate as completion fluid tackifier and the good functional component of environmental-friendly and compatibility for the first time, it is 1.40g/cm that density can be substituted by, which configuring,3CaCl2The novel alkaline completion fluid of completion brine；The alkalinity completion fluid is obtained by stirring evenly the segmentation addition of potassium carbonate, hydrophobically modified sodium alginate, inhibitor, fluid loss additive and defoaming agent into water, and preparation method is simple, and safety has fabulous industrial prospect.
Description
Technical field
The present invention relates to completion brine technical field, in particular to a kind of substitution CaCl2Alkaline completion fluid and its system
Preparation Method.
Background technique
Completion fluid is working solution used in Completion Operations, and major function includes equilibrium strata pressure, carries suspension admittedly
Phase particle, raising reservoir protection ability etc..Oil well productivity can be made to reduce by 30% or more using completion fluid inferior, while stratum is made
At damage.
CaCl2Completion brine is the Killing Fluid System being commonly used in current Completion Operations, its advantage is that it is cheap,
1.40g/cm can be reached by being completely dissolved rear fluid density3Left and right；However CaCl2There is also many disadvantages for completion brine: 1) In
When winter construction, since outdoor temperature is very low (when being lower than 10 DEG C), since the physicochemical property of itself makes CaCl2Solution rate is slow
Slowly, solid concentration increases, and saline solution density is extremely difficult to require, and can only achieve 1.25g/cm sometimes3Left and right；2) due to dissolution
Property it is poor, inorganic salts insoluble microparticle intrusion causes formation pore to block；3) due to CaCl2For divalent metal salt, Ca2+Salt is easily tied
Dirty phenomenon not environmentally has damage to reservoir；4) completion fluid system self performance is short of, and cement particle is made loosely to dissolve afterwards, make mine
Object dissolution or recrystallization, occur fine migration and mineral precipitation, cause rock to formation damage.After reservoir is damaged, first is that
Be easy to causeing the production capacity of oil reservoirs reduces, and serious person completely loses oil productive capacity, causes the huge economic losses in oil field；Two are intended to
It is extremely difficult to be restored to previous level, natural expense is also very expensive.Therefore, it is badly in need of researching and developing a kind of substitution CaCl2
Completion fluid system, reduce the damage to oil-gas Layer to greatest extent.
Summary of the invention
The object of the present invention is to provide one kind can substitute current CaCl2Completion brine is completely dissolved rear fluid density
1.40g/cm can be reached3The alkaline completion fluid of left and right.
Above-mentioned substitution CaCl is prepared it is a further object of the present invention to provide a kind of2Alkaline completion fluid preparation method.
For this purpose, technical solution of the present invention is as follows:
A kind of substitution CaCl2Alkaline completion fluid, including 30~70% potassium carbonate based on mass fraction, 1~3%
The water of hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1% defoaming agent and surplus is (each
The sum of constituent content is total 100%).
Wherein, commercial product, industrial goods purity >=95% can be selected in the inorganic salts potassium carbonate；Select potassium carbonate substitution
The CaCl that tradition uses2, not only ensure that original CaCl2Completion brine fluid density reaches 1.40g/cm3Requirement；Together
When, avoid CaCl2Completion brine is due to Ca2+The problem of reservoir caused by scale formation damages.
Specifically, the hydrophobically modified sodium alginate is to change using alkyl glycidyl ether as raw material to sodium alginate
Property be made；Specific step is as follows: weighing a certain amount of sodium alginate and is added into reaction flask, enough water is added to stir to yellow homogeneous
Emulsion；Then NaOH is added dropwise and adjusts emulsion pH to 8~9 or so, be slowly added to be equivalent to sodium alginate weight 0.4~
0.7 times of alkyl glycidyl ether is warming up to 70~80 DEG C and 8~10h of back flow reaction；It is cooled to room temperature, drips after reaction
Add acetic acid to adjust reaction solution pH to 3~4, and then enough acetone is added and washes away water and alkyl glycidyl ether in reaction solution, makes
Product filters after being precipitated, and washs, and drying is spare.
Wherein, it is 40000~120000 sodium alginate, the alkyl glycidyl that the sodium alginate, which selects molecular weight,
Ether one of is but is not limited to octyl glycidyl ether, lauryl diglycidyl ether；It is carried out by alkyl glycidyl ether
Hydrophobically modified inhibits the high viscosity characteristic of sodium alginate；By test, sodium alginate after before modified adds in water
When entering amount and being 1~1.5wt.%, sodium alginate before modified is slowly dissolved in the viscosity after water and is up to 200mp.s, and passes through and change
Property after hydrophobically modified sodium alginate be dissolved in the speed of water and obviously accelerate, viscosity is 120~180mp.s；As it can be seen that hydrophobically modified is extra large
Mosanom, which is dissolved in the viscosity after water, effectively to be reduced, while the speed for being dissolved in water is obviously accelerated, that is, enhances water solubility.
It is emphasized that the application is put forward for the first time the thickening using hydrophobically modified sodium alginate as completion fluid system
Efficient Adhesive Promotion is being realized in agent, and while effectivelying prevent leakage, faster than other tackifier solution rates, Efficient Adhesive Promotion is more preferable.
The inhibitor polyethylene polyamines, polyaminoacid or modified starch.
Specifically, the polyethylene polyamines are ethylenediamine, diethylenetriamines, trien, tetren
Co-product；The polyaminoacid is one of poly-aspartate, polyglutamic acid, polylysine or a variety of；The modified shallow lake
Powder is hydroxyethyl modified starch or sodium carboxymethyl starch.
Compared to traditional inhibitor, such as KCl- polyamine salt, above-mentioned inhibitor is without Cl-, because higher without occurring
The chloride ion iteration of concentration forms chlorinated compound, and carcinogenic, teratogenesis, mutagens effect, pollution of ecological environment occurs.
The fluid loss additive is carboxymethyl cellulose；Carboxymethyl cellulose not only has filtrate loss controllability, also belongs to simultaneously
Modified natural polymer is environmental-friendly degradation material.
The defoaming agent is dimethyl silicone polymer, polyoxyethylene polyoxy propyl alcohol amidogen ether or polypropylene glycerol aether；
A kind of substitution CaCl2Alkaline completion fluid preparation method, steps are as follows: by deionized water, 30~70% nothing
Machine salt potassium carbonate, 1~2% inhibitor, 1~2% fluid loss additive are added sequentially to stir evenly in reaction flask, stir at room temperature
Mix 0.5~1h, then be added 1~3% hydrophobically modified sodium alginate, continue at room temperature stirring 0.5~1h to be uniformly mixed,
It is eventually adding 0~1% defoaming agent, continues stirring until forming uniform alkaline completion fluid system；Wherein, above-mentioned each component plus
Enter amount based on mass fraction, the sum of the additional amount of deionized water and other each component additional amounts are 100%.The hydrophobically modified
Sodium alginate is modified to sodium alginate obtained using alkyl glycidyl ether as raw material.
The alkalinity completion fluid system is transparency liquid, and pH is 10~12.
Compared with prior art, substitution CaCl2The alkaline completion fluid of completion brine select potassium carbonate as monovalence without
Machine salt prepares alkaline completion fluid, and good by dissolubility, solution rate is fast, non-scaling, and environmental protection is small to reservoir damage, after dissolution
Density of completion fluids can reach 1.40g/cm3Etc. outstanding features, be configured to new potassium carbonate salt water completion fluid system, realize complete
Substitute tradition CaCl2Completion brine；In addition, the alkalinity completion fluid system filters out compatibility well and has environmental-friendly spy
Property hydrophobically modified sodium alginate, inhibitor, fluid loss additive and defoaming agent, make, Low Damage pollution-free to reservoir, and construct
Middle use is safe, not only balances strata pressure, but also protect the novel alkaline completion fluid of oil and gas reservoir；In addition, substitution CaCl2
The alkaline completion fluid preparation method of completion brine is simple, and safety has fabulous industrial prospect.
Specific embodiment
The present invention is described further combined with specific embodiments below, but following embodiments absolutely not to the present invention have appoint
What is limited.
In following Examples 1 to 4, potassium carbonate (industrial goods purity >=95%), poly-aspartate, polyethylene polyamines, carboxylic
Methylcellulose, dimethyl silicone polymer, hydroxyethyl modified starch and polypropylene glycerol aether are purchased from commercial product；It is hydrophobic
Modified sodium alginate is prepared by laboratory.
Specifically, hydrophobically modified sodium alginate is added to reaction flask the preparation method comprises the following steps: weighing a certain amount of sodium alginate
In, add enough water to stir to the emulsion of yellow homogeneous；Then NaOH is added dropwise and adjusts emulsion pH to 9 or so, is slowly added to phase
When in 0.5 times of sodium alginate weight of octyl glycidyl ether, being warming up to 75 DEG C and back flow reaction 8h；It is cooled to after reaction
Room temperature is added dropwise acetic acid and adjusts reaction solution pH to 4, and then enough acetone is added and washes away water and octyl glycidyl in reaction solution
Ether filters, acetone secondary washing after product is precipitated, and drying is spare.
Embodiment 1
54.2 parts of deionized waters, 40 parts of potassium carbonate, 1 part of poly-aspartate, 1.8 parts of carboxymethyl celluloses are added sequentially to
It is stirred evenly in reaction flask, and 0.5~1h is stirred at room temperature；Then 2.5 parts of hydrophobically modified alginic acids are added into reaction flask
Sodium continues 0.5~1h of stirring, makes mixed system uniform state；And then 0.5 part of polyoxypropylene glyceryl is added into reaction flask
Ether continues stirring until forming uniform transparent basic completion fluid system.
Wherein, the addition number of above-mentioned each component is parts by weight, and following example 2~5 are same, is repeated no more.
Embodiment 2
40.5 parts of deionized waters, 55 parts of potassium carbonate, 1.5 parts of polyethylene polyamines, 1.2 parts of carboxymethyl celluloses are sequentially added
It is stirred evenly into reaction flask, and 0.5~1h is stirred at room temperature；Then 1.5 parts of hydrophobically modified seaweed are added into reaction flask
Sour sodium continues 0.5~1h of stirring, makes mixed system uniform state；And then 0.3 part of polydimethylsiloxanes is added into reaction flask
Alkane continues stirring until forming uniform transparent basic completion fluid system.
Embodiment 3
27.6 parts of deionized waters, 65 parts of potassium carbonate, 2 parts of hydroxyethyl modified starch, 1.5 parts of carboxymethyl celluloses are successively added
Enter and stirred evenly into reaction flask, and 0.5~1h is stirred at room temperature；Then 3 parts of hydrophobically modified seaweed are added into reaction flask
Sour sodium continues 0.5~1h of stirring, makes mixed system uniform state；And then 0.9 part of polyoxypropylene glyceryl is added into reaction flask
Ether continues stirring until forming uniform transparent basic completion fluid system.
Embodiment 4
48.7 parts of deionized waters, 47 parts of potassium carbonate, 1.2 parts of polyethylene polyamines, 2 parts of carboxymethyl celluloses are added sequentially to
It is stirred evenly in reaction flask, and 0.5~1h is stirred at room temperature；Then 1 part of hydrophobically modified sodium alginate is added into reaction flask,
Continue 0.5~1h of stirring, makes mixed system uniform state；And then 0.1 part of polyoxyethylene polyoxy propyl alcohol is added into reaction flask
Amidogen ether continues stirring until forming uniform transparent basic completion fluid system.
The relevant nature of the alkaline completion fluid system of Examples 1 to 4 preparation is tested, test includes liquid pH value
Measurement, fluid density measurement are with, compatibility and the experiment of core permeability recovery value and core damage rate evaluation experimental.
Wherein, core permeability recovery value be evaluation completion fluid to the extent of damage of reservoir or to reservoir protection effect most
Intuitive method；It uses natural core in flooding test device, the permeability of measurement experiment rock core pollution front and back, gained ratio
Value is permeability resume figure.Permeability resume figure can intuitively reflect the extent of damage of reservoir core.The permeability of completion fluid
Recovery value is bigger, illustrates smaller to formation damage, and general permeability resume figure should (specific method can refer to " sand not less than 75%
Rock reservoir sensitivity evaluation --- core flow test program " professional standard).
The measuring method of core damage rate: it takes several blocks of rock cores that washing oil, the desalinization of soil by flooding or leaching have been handled to do parallel laboratory test, uses coal first
The original permeability of oil every block of rock core of test, then pollutes rock core using the alkaline completion fluid of preparation, re-test pollution
Core permeability afterwards evaluates core damage rate by the ratio of the permeability of pollution front and back.
Test result is as follows shown in table 1.
Table 1:
From the test result of upper table 1 can be seen that Examples 1 to 4 prepare carry out compounding alkali by inorganic salts of potassium carbonate
The property completion fluid system equal > 10 of pH, density can reach 1.39~1.47g/cm3, it is fully able to substitute traditional calcium chloride brine complete
Well liquid system；In addition, introducing completion fluid system as tackifier for by the sodium alginate of hydrophobically modified, and pass through many experiments
Filter out with excellent degradability and with substance as inhibitor, fluid loss additive and defoaming agent and potassium carbonate and hydrophobically modified
The completion fluid that sodium alginate is configured is uniformly dissolved, and compatibility is good.
In addition, the alkalinity completion fluid is in core permeability recovery value and the test of core damage rate, core permeability is extensive
Complex value is more than 80, and core damage rate controls below 20.1%；And the formation damage for comparing calcium chloride brine completion fluid system is commented
The core permeability recovery value of valence experimental result, calcium chloride brine completion fluid is about 75, and core damage rate is about 25%, it is seen that this
The disclosed alkaline completion fluid of application not only can achieve the effect of traditional calcium chloride brine completion fluid system, and can be maximum
Limit reduces the damage to oil-gas Layer.
Claims (3)
1. a kind of substitution CaCl2Alkaline completion fluid, which is characterized in that including 30~70% potassium carbonate based on mass fraction,
1~3% hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1% defoaming agent and surplus
Water, the sum of each component content total 100%；Wherein, the inhibitor is polyethylene polyamines, polyaminoacid or modified starch；
The hydrophobically modified sodium alginate is the sodium alginate for being 40000~120000 to molecular weight by raw material of alkyl glycidyl ether
It is modified hydrophobically modified sodium alginate obtained；The fluid loss additive is carboxymethyl cellulose；The polyethylene polyamines are second
The co-product of diamines, diethylenetriamines, trien, tetren；The polyaminoacid be poly-aspartate,
One of polyglutamic acid, polylysine are a variety of；The modified starch is hydroxyethyl modified starch or the carboxymethyl modified shallow lake of sodium
Powder.
2. substitution CaCl according to claim 12Alkaline completion fluid, which is characterized in that the defoaming agent be poly dimethyl
Siloxanes, polyoxyethylene polyoxy propyl alcohol amidogen ether or polypropylene glycerol aether.
3. a kind of substitution CaCl as described in claim 12Alkaline completion fluid preparation method, which is characterized in that step is such as
Under: by deionized water, 30~70% inorganic salts potassium carbonate, 1~2% inhibitor, 1~2% fluid loss additive sequentially add
It is stirred evenly into reaction flask, stirs 0.5~1h at room temperature, 1~3% hydrophobically modified sodium alginate is then added, continues room
Lower 0.5~the 1h of stirring of temperature is eventually adding 0~1% defoaming agent to being uniformly mixed, and continues stirring until forming the uniform complete well of alkalinity
Liquid system；Wherein, based on mass fraction, the additional amount of deionized water and other each components are added the additional amount of above-mentioned each component
The sum of amount is 100%.
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| CN1342189A (en) * | 1999-02-09 | 2002-03-27 | Masi科技股份有限公司 | Aphron-containing aqueous well drilling and servicing fluids |
| WO2016072993A1 (en) * | 2014-11-06 | 2016-05-12 | Halliburton Energy Services, Inc. | Composition including a viscosifier and a hydrophobically-modified polymer that includes a nitrogen-containing repeating unit for treatment of subterranean formations |
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| WO2016072993A1 (en) * | 2014-11-06 | 2016-05-12 | Halliburton Energy Services, Inc. | Composition including a viscosifier and a hydrophobically-modified polymer that includes a nitrogen-containing repeating unit for treatment of subterranean formations |
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Effective date of registration: 20211027 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |