CN106905936A - One kind substitutes CaCl2Pollution-free Low Damage alkalescence completion fluid and preparation method thereof - Google Patents
One kind substitutes CaCl2Pollution-free Low Damage alkalescence completion fluid and preparation method thereof Download PDFInfo
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- CN106905936A CN106905936A CN201710074054.6A CN201710074054A CN106905936A CN 106905936 A CN106905936 A CN 106905936A CN 201710074054 A CN201710074054 A CN 201710074054A CN 106905936 A CN106905936 A CN 106905936A
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- completion fluid
- alkalescence
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- low damage
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- 239000012530 fluid Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 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 30
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000001110 calcium chloride Substances 0.000 claims abstract description 17
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 17
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 14
- 239000003112 inhibitor Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 239000013530 defoamer Substances 0.000 claims abstract description 9
- -1 alkyl glycidyl ether Chemical compound 0.000 claims description 29
- 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 13
- 235000010413 sodium alginate Nutrition 0.000 claims description 13
- 229940005550 sodium alginate Drugs 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 229920000881 Modified starch Polymers 0.000 claims description 8
- 239000004368 Modified starch Substances 0.000 claims description 8
- 235000019426 modified starch Nutrition 0.000 claims description 8
- 229920000768 polyamine Polymers 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 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
- 239000003795 chemical substances by application 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
- 229940084030 carboxymethylcellulose calcium Drugs 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229920005573 silicon-containing polymer Polymers 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
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 2
- 108010020346 Polyglutamic Acid Proteins 0.000 claims description 2
- 108010039918 Polylysine Proteins 0.000 claims description 2
- 230000002209 hydrophobic effect Effects 0.000 claims description 2
- 229920002643 polyglutamic acid Polymers 0.000 claims description 2
- 229920000656 polylysine Polymers 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
- 150000001336 alkenes Chemical class 0.000 claims 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims 1
- 230000001629 suppression Effects 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
- 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
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 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
- 239000011435 rock Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 4
- 235000001465 calcium Nutrition 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 4
- 229940105329 carboxymethylcellulose Drugs 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 4
- 239000007788 liquid Substances 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
- 238000002474 experimental method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- HRWYHCYGVIJOEC-UHFFFAOYSA-N 2-(octoxymethyl)oxirane Chemical compound CCCCCCCCOCC1CO1 HRWYHCYGVIJOEC-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000011156 evaluation 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
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-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
- 238000003556 assay Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- QNEFNFIKZWUAEQ-UHFFFAOYSA-N carbonic acid;potassium Chemical compound [K].OC(O)=O QNEFNFIKZWUAEQ-UHFFFAOYSA-N 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
- 230000008859 change Effects 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
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 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
- 238000005259 measurement Methods 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
- 235000010755 mineral Nutrition 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
- 239000012071 phase Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000012266 salt solution 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
- 239000007790 solid phase Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 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
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)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
CaCl is substituted the invention discloses one kind2Pollution-free Low Damage alkalescence completion fluid and preparation method thereof, the alkaline completion fluid includes the potassium carbonate of 30~70% in terms of mass fraction, 1~3% hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1% defoamer and the water of surplus；By using hydrophobically modified sodium alginate first as completion fluid tackifier and the good functional component of environment-friendly and compatibility, configuring can substitute density for 1.40g/cm3CaCl2The novel alkaline completion fluid of completion brine；The alkaline completion fluid is prepared by will be stirred in potassium carbonate, hydrophobically modified sodium alginate, inhibitor, fluid loss additive and defoamer segmentation addition to water, and preparation method is simple, safety, with fabulous industrial prospect.
Description
Technical field
It is more particularly to a kind of to substitute CaCl the present invention relates to completion brine technical field2Pollution-free Low Damage alkalescence
Completion fluid and preparation method thereof.
Background technology
Completion fluid is the working solution used in Completion Operations, its major function include equilibrium strata pressure, carry suspend it is solid
Phase particle, raising reservoir protection ability etc..Oil well productivity reduction by more than 30% can be made using completion fluid inferior, while being made to stratum
Into infringement.
CaCl2Completion brine is the Killing Fluid System being commonly used in current Completion Operations, its advantage be it is cheap,
Being completely dissolved rear fluid density can reach 1.40g/cm3Left and right；But CaCl2Completion brine there is also many shortcomings：1) exist
During winter construction, because outdoor temperature is very low (during less than 10 DEG C), because the physicochemical property of itself causes CaCl2Dissolution velocity is delayed
Slowly, solid concentration increases, and saline solution density is extremely difficult to require, 1.25g/cm is can only achieve sometimes3Left and right；2) due to dissolving
Property it is poor, inorganic salts insoluble microparticle invade cause formation pore to block；3) due to CaCl2It is divalent metal salt, Ca2+Salt is easily tied
Dirty phenomenon, not environmentally, has infringement to reservoir；4) completion fluid system self performance shortcoming, makes cement particle loosely dissolve afterwards, make ore deposit
Thing dissolves or recrystallizes, and fine migration and mineral precipitation occur, and causes rock to formation damage.After reservoir suffers damage, one is
The production capacity reduction of oil reservoirs is easily caused, severe patient completely loses oil productive capacity, causes the huge economic losses in oil field；Two are intended to
Return to previous level extremely difficult, natural expense is also very expensive.Therefore, it is badly in need of a kind of replacement CaCl of research and development2
Pollution-free Low Damage completion fluid system, the infringement to oil-gas Layer is reduced to greatest extent.
The content of the invention
Current CaCl can be substituted it is an object of the invention to provide one kind2Completion brine, is completely dissolved rear fluid density
1.40g/cm can be reached3The pollution-free Low Damage alkalescence completion fluid of left and right.
Above-mentioned replacement CaCl is prepared it is a further object of the present invention to provide one kind2Pollution-free Low Damage alkalescence completion fluid
Preparation method.
Therefore, technical solution of the present invention is as follows：
One kind substitutes CaCl2Pollution-free Low Damage alkalescence completion fluid, including in terms of mass fraction 30~70% carbon
Sour potassium, 1~3% hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1% defoamer
With the water (each component content sum amounts to 100%) of surplus.
Wherein, the inorganic salts potassium carbonate can select commercially available prod, its industrial goods purity >=95%；Substituted from potassium carbonate
The CaCl that tradition is used2, not only ensure that original CaCl2Completion brine fluid density reaches 1.40g/cm3Requirement；Meanwhile,
Avoid CaCl2Completion brine is due to Ca2+The problem that the reservoir that scale formation is caused is damaged.
Specifically, the hydrophobically modified sodium alginate is, with alkyl glycidyl ether as raw material, sodium alginate to be changed
Property be obtained；Comprise the following steps that：A certain amount of sodium alginate is weighed to add into reaction bulb, plus enough water is stirred to yellow homogeneous
Emulsion；Then be added dropwise NaOH adjust emulsion pH to 8~9 or so, be slowly added to 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；Reaction is cooled to room temperature after terminating, and drips
Plus acetic acid regulation reaction solution pH to 3~4, and then add enough acetone to wash away water and alkyl glycidyl ether in reaction solution, make
Product is filtered after separating out, washing, and drying is standby.
Wherein, the sodium alginate is from the sodium alginate that molecular weight is 40000~120000, the alkyl glycidyl
One kind that ether is but is not limited in octyl glycidyl ether, lauryl diglycidyl ether；Carried out by alkyl glycidyl ether
Hydrophobically modified, the high viscosity characteristic to sodium alginate suppresses；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 up to 200mp.s after water, and passes through and change
Property after hydrophobically modified sodium alginate be dissolved in the speed of water and substantially accelerate, viscosity is 120~180mp.s；It can be seen that, hydrophobically modified sea
Mosanom is dissolved in the viscosity after water effectively to be reduced, while the speed for being dissolved in water is substantially accelerated, that is, enhances water solubility.
It is emphasized that the application proposes the thickening as completion fluid system using hydrophobically modified sodium alginate first
Agent, is realizing Efficient Adhesive Promotion, and while effectively preventing leakage, than other tackifier dissolution velocities faster, 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 or more in poly-aspartate, polyglutamic acid, polylysine；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-, thus will not occur higher
The chlorion iteration of concentration forms chlorinated compound, and carcinogenic, teratogenesis, mutagens effect, pollution of ecological environment occur.
The fluid loss additive is carboxymethylcellulose calcium；Carboxymethylcellulose calcium not only has filtrate loss controllability, while falling within
Modified natural polymer, is environment-friendly degradation material.
The defoamer is dimethyl silicone polymer, polyoxyethylene polyoxy propyl alcohol amidogen ether or polypropylene glycerol aether；
One kind substitutes CaCl2Pollution-free Low Damage alkalescence completion fluid preparation method, step is as follows：By deionized water,
30~70% inorganic salts potassium carbonate, 1~2% inhibitor, 1~2% fluid loss additive are added sequentially to be stirred in reaction bulb
Uniformly, 0.5~1h is stirred at room temperature, 1~3% hydrophobically modified sodium alginate is subsequently adding, and continues to stir 0.5~1h at room temperature
To well mixed, 0~1% defoamer is eventually adding, continues to stir until forming uniform alkalescence completion fluid system；Wherein, on
The addition of each component is stated in terms of mass fraction, the addition of deionized water is 100% with other each component addition sums.
The hydrophobically modified sodium alginate is, with alkyl glycidyl ether as raw material, sodium alginate to be modified prepared.
The alkaline completion fluid system is transparency liquid, and pH is 10~12.
Compared with prior art, replacement CaCl2The pollution-free Low Damage alkalescence completion fluid of completion brine selects carbonic acid
Potassium prepares alkaline completion fluid as inorganic monovalent salt, and it passes through, and dissolubility is good, and dissolution velocity is fast, non-scaling, environmental protection, and reservoir is hindered
Evil is small, and density of completion fluids can reach 1.40g/cm after dissolving3Etc. outstanding feature, new potassium carbonate salt solution completion fluid is configured to
System, realizes substituting tradition CaCl completely2Completion brine；Additionally, the alkaline completion fluid system filters out compatibility well and tool
Have hydrophobically modified sodium alginate, inhibitor, fluid loss additive and the defoamer of environment-friendly characteristic, make it is pollution-free to reservoir,
Using safety in Low Damage, and construction, strata pressure is both balanced, the novel alkaline completion fluid of oil and gas reservoir is protected again；Separately
Outward, replacement CaCl2The pollution-free Low Damage alkalescence completion liquid and preparation method thereof of completion brine is simple, safety, with fabulous
Industrial prospect.
Specific embodiment
With reference to specific embodiment, the present invention is described further, but following embodiments absolutely not to the present invention have appoint
What is limited.
In following embodiments 1~4, potassium carbonate (industrial goods purity >=95%), poly-aspartate, polyethylene polyamines, carboxylic
Methylcellulose, dimethyl silicone polymer, hydroxyethyl modified starch and polypropylene glycerol aether are bought from commercially available prod；It is hydrophobic
Modified sodium alginate is prepared by laboratory.
Specifically, the preparation method of hydrophobically modified sodium alginate is：A certain amount of sodium alginate is weighed to add to reaction bulb
In, plus enough water stirred to the emulsion of yellow homogeneous；Then NaOH is added dropwise and adjusts emulsion pH to 9 or so, be slowly added to phase
When in the octyl glycidyl ether of 0.5 times of sodium alginate weight, being warming up to 75 DEG C and back flow reaction 8h；Reaction is cooled to after terminating
Room temperature, is added dropwise acetic acid regulation reaction solution pH to 4, and then add enough acetone to wash away water and octyl glycidyl in reaction solution
Ether, makes product be filtered after separating out, and acetone secondary washing, drying is standby.
Embodiment 1
54.2 parts of deionized waters, 40 parts of potassium carbonate, 1 part of poly-aspartate, 1.8 parts of carboxymethylcellulose calciums are added sequentially to
Stirred in reaction bulb, and 0.5~1h is stirred at room temperature；Then to 2.5 parts of hydrophobically modified alginic acids of addition in reaction bulb
Sodium, continues to stir 0.5~1h, makes mixed system be uniform state；And then to 0.5 part of polyoxypropylene glyceryl of addition in reaction bulb
Ether, continues to stir until forming uniform transparent basic completion fluid system.
Wherein, the addition number of above-mentioned each component is weight portion, and example 2 below~5 are same, repeat 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 carboxymethylcellulose calciums are sequentially added
Stirred in reaction bulb, and 0.5~1h is stirred at room temperature；Then to 1.5 parts of hydrophobically modified marine algas of addition in reaction bulb
Sour sodium, continues to stir 0.5~1h, makes mixed system be uniform state；And then to 0.3 part of polydimethylsiloxanes of addition in reaction bulb
Alkane, continues to stir 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 carboxymethylcellulose calciums are added successively
Enter and stirred in reaction bulb, and 0.5~1h is stirred at room temperature；Then to 3 parts of hydrophobically modified marine algas of addition in reaction bulb
Sour sodium, continues to stir 0.5~1h, makes mixed system be uniform state；And then to 0.9 part of polyoxypropylene glyceryl of addition in reaction bulb
Ether, continues to stir 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 carboxymethylcellulose calciums are added sequentially to
Stirred in reaction bulb, and 0.5~1h is stirred at room temperature；Then to 1 part of hydrophobically modified sodium alginate of addition in reaction bulb,
Continue to stir 0.5~1h, make mixed system be uniform state；And then to 0.1 part of polyoxyethylene polyoxy propyl alcohol of addition in reaction bulb
Amidogen ether, continues to stir until forming uniform transparent basic completion fluid system.
The relevant nature of the alkaline completion fluid system prepared to embodiment 1~4 is tested, and test includes that liquid pH value is surveyed
Fixed, fluid density is determined with, compatibility, and the experiment of core permeability recovery value and core damage rate evaluation experimental.
Wherein, core permeability recovery value be evaluate completion fluid to the extent of damage of reservoir or to reservoir protection effect most
Intuitively method；It uses natural core in flooding test device, and measurement experiment rock core pollutes front and rear permeability, 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 not less than 75%《Sand
Rock reservoir sensitivity evaluation --- core flow test program》Professional standard).
The assay method of core damage rate：Take some blocks of rock cores that washing oil, the desalinization of soil by flooding or leaching have been processed and do parallel laboratory test, coal is used first
Oil every piece of original permeability of rock core of test, then carries out dirt using the pollution-free Low Damage alkalescence completion fluid prepared to rock core
Dye, the core permeability after re-test pollution, core damage rate is evaluated by the ratio of the permeability before and after pollution.
Test result is as shown in table 1 below.
Table 1：
From the test result of upper table 1 can be seen that embodiment 1~4 preparation 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 the traditional calcium chloride brine of replacement complete
Well liquid system；Additionally, completion fluid system will be introduced as tackifier by the sodium alginate of hydrophobically modified, and by many experiments
Filter out with excellent degradability and with material as inhibitor, fluid loss additive and defoamer and potassium carbonate and hydrophobically modified
Sodium alginate is carried out configuring the completion fluid for obtaining and is uniformly dissolved, and compatibility is good.
In addition, the alkaline completion fluid is in core permeability recovery value and the test of core damage rate, its core permeability is extensive
More than 80, core damage rate is controlled below 20.1% complex value；And the formation damage for contrasting calcium chloride brine completion fluid system is commented
Valency experimental result, the core permeability recovery value of calcium chloride brine completion fluid is about 75, and core damage rate is about 25%, it is seen that this
The disclosed alkalescence completion fluid of application can not only reach the effect of traditional calcium chloride brine completion fluid system, and can be maximum
Limit reduces the infringement to oil-gas Layer.
Claims (7)
1. it is a kind of to substitute CaCl2Pollution-free Low Damage alkalescence completion fluid, it is characterised in that including 30 in terms of mass fraction~
70% potassium carbonate, 1~3% hydrophobically modified sodium alginate, 1~2% inhibitor, 1~2% fluid loss additive, 0~1%
Defoamer and surplus water, each component content sum amounts to 100%.
2. replacement CaCl according to claim 12Pollution-free Low Damage alkalescence completion fluid, it is characterised in that it is described hydrophobic
It, with alkyl glycidyl ether as raw material, is that 40000~120000 sodium alginate changes to molecular weight that modified sodium alginate is
Property be obtained.
3. replacement CaCl according to claim 12Pollution-free Low Damage alkalescence completion fluid, it is characterised in that the suppression
Agent polyethylene polyamines, polyaminoacid or modified starch.
4. replacement CaCl according to claim 32Pollution-free Low Damage alkalescence completion fluid, it is characterised in that the poly- second
Alkene polyamines is ethylenediamine, diethylenetriamines, trien, the co-product of tetren；The polyaminoacid is
One or more in poly-aspartate, polyglutamic acid, polylysine；The modified starch is hydroxyethyl modified starch or sodium carboxylic
Methyl modified starch.
5. replacement CaCl according to claim 12Pollution-free Low Damage alkalescence completion fluid, it is characterised in that drop filter
Mistake agent is carboxymethylcellulose calcium.
6. replacement CaCl according to claim 12Pollution-free Low Damage alkalescence completion fluid, it is characterised in that the froth breaking
Agent is dimethyl silicone polymer, polyoxyethylene polyoxy propyl alcohol amidogen ether or polypropylene glycerol aether.
7. it is a kind of to substitute CaCl2Pollution-free Low Damage alkalescence completion fluid preparation method, it is characterised in that step is as follows：To go
Ionized water, 30~70% inorganic salts potassium carbonate, 1~2% inhibitor, 1~2% fluid loss additive are added sequentially to reaction bulb
In stir, 0.5~1h is stirred at room temperature, be subsequently adding 1~3% hydrophobically modified sodium alginate, continuation is stirred at room temperature
0.5~1h is eventually adding 0~1% defoamer to well mixed, continues to stir until forming uniform alkalescence completion fluid system；
Wherein, the addition of above-mentioned each component is in terms of mass fraction, the addition of deionized water and other each component addition sums
It is 100%.
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| CN201710074054.6A CN106905936B (en) | 2017-02-10 | 2017-02-10 | A kind of substitution CaCl2Alkaline completion fluid and preparation method thereof |
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| CN106905936B CN106905936B (en) | 2019-11-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118853117A (en) * | 2024-06-28 | 2024-10-29 | 东北石油大学 | A double water plugging and profile control plugging agent and preparation method thereof |
| CN119161736A (en) * | 2024-10-08 | 2024-12-20 | 湖北卡乐尔新材料科技有限公司 | Colorant for silicone products and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20160102236A1 (en) * | 2013-08-16 | 2016-04-14 | Halliburton Energy Services, Inc. | Hydrophobically and hydrophilically modified polysaccharides and methods of using the same for treatment of a subterranean formation |
| 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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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US20160102236A1 (en) * | 2013-08-16 | 2016-04-14 | Halliburton Energy Services, Inc. | Hydrophobically and hydrophilically modified polysaccharides and methods of using the same for treatment of a subterranean formation |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118853117A (en) * | 2024-06-28 | 2024-10-29 | 东北石油大学 | A double water plugging and profile control plugging agent and preparation method thereof |
| CN118853117B (en) * | 2024-06-28 | 2025-11-21 | 东北石油大学 | Dual-water-shutoff profile-control plugging agent and preparation method thereof |
| CN119161736A (en) * | 2024-10-08 | 2024-12-20 | 湖北卡乐尔新材料科技有限公司 | Colorant for silicone products and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106905936B (en) | 2019-11-12 |
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Inventor after: Liu Yin Inventor after: Qiu Weihong Inventor after: Zhang Shuguang Inventor after: Li Lichang Inventor after: Bai Tianzeng Inventor after: Jie Hongxiang Inventor after: Wang Hongke Inventor after: Wang Yuzhong Inventor after: Liu Luping Inventor after: Wang Dan Inventor before: Liu Yin Inventor before: Li Lichang Inventor before: Bai Tianzeng Inventor before: Jie Hongxiang Inventor before: Wang Hongke Inventor before: Wang Yuzhong Inventor before: Liu Luping Inventor before: Wang Dan Inventor before: Qiu Weihong |
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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. |