CN106566488B - Kill-job polymer gel and the preparation method and application thereof - Google Patents
Kill-job polymer gel and the preparation method and application thereof Download PDFInfo
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- CN106566488B CN106566488B CN201610963885.4A CN201610963885A CN106566488B CN 106566488 B CN106566488 B CN 106566488B CN 201610963885 A CN201610963885 A CN 201610963885A CN 106566488 B CN106566488 B CN 106566488B
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- 229920000642 polymer Polymers 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 22
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 20
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 abstract description 14
- 239000011734 sodium Substances 0.000 claims abstract description 14
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920002261 Corn starch Polymers 0.000 claims abstract description 11
- 239000008120 corn starch Substances 0.000 claims abstract description 10
- 229940099112 cornstarch Drugs 0.000 claims abstract description 10
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims abstract description 9
- -1 organo montmorillonite Chemical compound 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- 239000000499 gel Substances 0.000 abstract description 52
- 238000007789 sealing Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000005553 drilling Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000003431 cross linking reagent Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- ZUGAOYSWHHGDJY-UHFFFAOYSA-K 5-hydroxy-2,8,9-trioxa-1-aluminabicyclo[3.3.2]decane-3,7,10-trione Chemical compound [Al+3].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O ZUGAOYSWHHGDJY-UHFFFAOYSA-K 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 235000019759 Maize starch Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 229920001222 biopolymer Polymers 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 239000012024 dehydrating agents Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229940100486 rice starch Drugs 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 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
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C09K8/40—Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/424—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells using "spacer" compositions
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention discloses a kind of kill-job polymer gels and the preparation method and application thereof.Kill-job polymer gel of the invention is made of partially hydrolyzed polyacrylamide (PHPA), chromium acetate, thiocarbamide, structure reinforcing agent and water；Wherein, in terms of the quality of the kill-job polymer gel, the mass percent of partially hydrolyzed polyacrylamide (PHPA) is 1%~4%, the mass percent of chromium acetate is 0.1%~0.4%, the mass percent of thiocarbamide is 0.05%~0.2%, the mass percent of structure reinforcing agent is 1%~7%；Surplus is water；The structure reinforcing agent is sodium-based montmorillonite, cornstarch or organo montmorillonite.The compressive resistance of kill-job polymer gel of the invention is high, has excellent adhesion strength and sealing function to casing, can be applied in oil reservoir or gas reservoir insufficient balance well completion.
Description
Technical field
The present invention relates to oil gas fields to be drilled well field more particularly to a kind of kill-job polymer gel and its preparation side
Method and application.
Background technique
Oilfield exploitation procedure needs drilling well, complete well, workover treatment, and conventional well killing fluid is easily missed, big to formation damage.
In order to solve practical site problems, in recent years petroleum worker to Low Damage and anti-leakage well killing fluid, gel leakage stopping technology, do not press
Well operations, underbalance are drilled the technologies such as well and are studied, and above-mentioned technology respectively has advantage and disadvantage.Wherein, under balance pressure drilling is also claimed
The pressure that is negative drilling well refers to that drilling fluid acts on shaft bottom hydrostatic pressure, recycle pressure drop and raised platform around a well back pressure is lower than in drilling process
The pressure of formation pore, the drilling well skill that formation fluid controlledly flows into pit shaft and controls this fluid circulation to ground again
Art.Under balance pressure drilling is in protection oil and gas reservoir, raising productivity of hydrocarbon, reduction reservoir damage, raising bit speed and timely hair
Existing low pressure, low osmoticing oil-gas layer etc. are of great significance.It generallys use installation casing valve both at home and abroad at present and no killing well rises
Lower boring device realizes insufficient balance well completion, but use the technology of casing valve and equipment to use difficulty is big, at high cost, risk is high.
Polymer gel kill-job technology is a kind of using high-molecular gel well killing fluid isolation pit shaft oil gas, equilibrium strata pressure
Realize the technology of insufficient balance well completion operation.For insufficient balance well completion polymer gel system by polymer host agent, crosslinking agent with
Additive composition is injected into predetermined injection position according to scheduled rate, forms the polymer gel glue with tridimensional network
Plug.In order to improve the performance of polymer gel well killing fluid, nano inoganic particle is often filled in polymer gel, it is multiple to form nanometer
Close gel.Certain pressure difference is resisted in the wellbore using the intensity and excellent adhesion of modified post-polymerization object gel；Using solidifying
The Solid Mechanics characteristic isolation of glue, seal shaft oil gas, and prevent the oil gas in reservoir from escaping outward, guarantee insufficient balance well completion
The safety of operation carries out.In the prior art, the compressive resistance of polymer gel is lower, is difficult to meet wanting for higher strata pressure
It asks；Moreover, gel cost in the prior art is also higher.
Summary of the invention
The purpose of the present invention is being directed to above-mentioned problems of the prior art, a kind of kill-job polymer gel is provided
And the preparation method and application thereof, the polymer gel compressive resistance is high, there is excellent adhesion strength and sealing function to casing.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of kill-job polymer gel, by partially hydrolyzed polyacrylamide (PHPA), chromium acetate, thiocarbamide, structure reinforcing agent and water
Composition；Wherein, in terms of the gross mass of the kill-job polymer gel, the mass percent of partially hydrolyzed polyacrylamide (PHPA) is
1%~4%, the mass percent of chromium acetate (crosslinking agent) be 0.1%~0.4%, the mass percent of thiocarbamide be 0.05%~
0.2%, the mass percent of structure reinforcing agent is 1%~7%；Surplus is water；
The structure reinforcing agent is sodium-based montmorillonite (NaMMT), cornstarch or organo montmorillonite (OMMT).
The mass percent of the partially hydrolyzed polyacrylamide (PHPA) is specially 1.5%~3%, and more specifically 2%；The second
The mass percent of sour chromium (crosslinking agent) is specially 0.15%~0.25%, and more specifically 0.2%；The quality percentage of the thiocarbamide
Number is specially 0.1%~0.2%, more specifically 0.2%.
The mass percent of the structure reinforcing agent is specially 5%-7%, more specifically 1%, 3%, 5% or 7%.
When the structure reinforcing agent is sodium-based montmorillonite, mass percent 7%；The structure reinforcing agent is corn shallow lake
When powder, mass percent 5%.
The degree of hydrolysis of the partially hydrolyzed polyacrylamide (PHPA) be 5%-20%, specially 20%；Molecular weight be 4,000,000~
18000000, specially 8,000,000.
The chemical analysis of the sodium-based montmorillonite is as follows: based on mass fraction, 67.16%SiO2, 20.60%Al2O3,
4.11%MgO, 3.21%CaO, 2.20%Fe2O3, 1.47%Na2O, 0.92%K2O, 0.17%TiO2And 0.16% other
Substance.
The cation exchange capacity of the sodium-based montmorillonite is 112mmol/100g.
The grain diameter of the cornstarch is 12.10 μm~17.07 μm.
The water is tap water.
A kind of preparation method of kill-job polymer gel, includes the following steps:
Under stiring, structure reinforcing agent is added into water, is dispersed using ultrasonic oscillator, is existed with high-speed stirring mixer
It is stirred under 400~600r/min revolving speed；Then thiocarbamide, partially hydrolyzed polyacrylamide (PHPA) are sequentially added, second is added after completely dissolution
Sour chromium, plastic.
The time of the stirring is 30min~120min.
Application of the kill-job polymer gel in oil reservoir or gas reservoir insufficient balance well completion.
The oil reservoir or gas reservoir are low-temperature reservoir or low temperature gas reservoir.
The formation temperature of the low-temperature reservoir or low temperature gas reservoir is 30~70 DEG C.
Advantages of the present invention is as follows:
(1) present invention is greatly improved due to joined sodium-based montmorillonite, cornstarch or organo montmorillonite structure reinforcing agent
The compressive resistance and compression performance of polymer gel.The resistance to pressure of kill-job provided by the invention polymer gel plural gel
Degree is up to 0.54MPam-1, compressive strength is up to 8.5111MPa, and elasticity modulus is up to 0.0081MPa.
(2) kill-job polymer gel of the invention also has excellent adhesion strength.
(3) gelation time of kill-job polymer gel provided by the invention is formed by 70 DEG C of gel in 1.5h or so
Thermal stability is good in lower 30 days, has stronger adhesion strength and sealing function to casing.
(4) after complete well, kill-job of the invention utilizes itself excellent broken colloidality energy with polymer gel, using nitrogen
Or raffinate, scrap rubber all rows of returning can be realized in clear water.
(5) it compares with xanthan gum in the prior art (biopolymer), partial hydrolysis polypropylene used in the present invention
The price of amide is cheaper, so that polymer gel of the invention has better economic benefit for oil field.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pressure measuring unit of the present invention.
Specific embodiment
The present invention is further described in detail With reference to embodiment, and the embodiment provided is only for explaining
The bright present invention, the range being not intended to be limiting of the invention.
Experimental method in following embodiments is unless otherwise specified conventional method.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
The degree of hydrolysis of partially hydrolyzed polyacrylamide (PHPA) used in following embodiments is 20%, and molecular weight is 8,000,000
Sodium-based montmorillonite is bought in Zhejiang Feng Hong new material Co., Ltd, and chemical component is as follows: based on mass fraction,
67.16%SiO2, 20.60%Al2O3, 4.11%MgO, 3.21%CaO, 2.20%Fe2O3, 1.47%Na2O, 0.92%K2O,
0.17%TiO2And 0.16% other substances；Cation exchange capacity is 112mmol/100g.
Cornstarch is bought in Hebei Hua Chen starch Co., Ltd, and particle size range is about in 12.10~17.07 μ
m。
Organo montmorillonite is bought in Zhejiang Feng Hong new material company.
Water is tap water.
Embodiment 1
Appropriate tap water is weighed in the balance to be added in beaker.Beaker is placed under blender, the bottom of stirring rod is from beaker
Bottom 1cm or so.DW-3 type digital display electric mixer switch is opened, adjusting mixing speed is about 400r/min, and so that water is formed whirlpool,
A certain amount of structure reinforcing agent is added by formula again, 30min is dispersed using ultrasonic oscillator, high-speed stirring mixer with
600r/min stirs 30min.Thiocarbamide, partially hydrolyzed polyacrylamide (PHPA) is weighed with assay balance again to be quickly and evenly added to respectively
In whirlpool.Continue to stir, until polymer is completely dispersed and (generally takes stirring 4h).Stop stirring, placement is poured into clean afterwards for 24 hours
Reagent bottle in it is stand-by.After polymer base fluid is placed for 24 hours, a certain amount of polymer base fluid is weighed in clean beaker, unlatching is stirred
Bar is mixed, polymer base fluid is stirred with 400 turns of speed per minute, then adds corresponding amount crosslinking agent (chromium acetate) solution, stirring
After mixing, it is placed in 70 DEG C of constant temperature ovens and reacts, plastic；Obtained kill-job polymer gel.
Wherein, the formula of kill-job polymer gel and its compressive resistance are as shown in table 1.
The formula and its compressive resistance of 1 kill-job polymer gel of table
Embodiment 2
Preparation method is the same as embodiment 1；Difference is in the formula of kill-job polymer gel, and structure reinforcing agent is sodium
Base montmorillonite, content are respectively 1%, 3%, 5%, 7%.Table 2 and table 3 are respectively that the different kill-job of sodium-based montmorillonite content is used
The compressive resistance and compression performance data of polymer gel.
The polymer gel compressive resistance data of the different montmorillonite contents of table 2
As shown in Table 2, addition sodium-based montmorillonite can significantly improve the compressive resistance of polymer gel, and compressive resistance
Increase with the increase of montmorillonite content；When sodium-based montmorillonite additive amount is 7%, the compressive resistance highest of plural gel reaches
0.54MPa·m-1。
The polymer gel compression test data of the different montmorillonite contents of table 3
Seen from table 3, when the compressive strength highest that sodium-based montmorillonite additive amount is 7% polymer gel formed, reach
8.5111MPa；Its elasticity modulus highest, reaches 0.0081MPa.
Embodiment 3
Preparation method is the same as embodiment 1；Difference is in the formula of kill-job polymer gel, and structure reinforcing agent is jade
Rice starch, content are respectively 1%, 3%, 5%, 7%.Table 4 is the different kill-job polymer gel of Maize Starch Content
Compressive resistance.
Influence of the 4 cornstarch dosage of table to polymer gel compressive resistance
As shown in Table 4, when cornstarch dosage 5%, the compressive resistance of polymer gel is up to 0.40MPam-1。
The gelation time of polymer gel of the invention is formed by thermostabilization in 30 days at 70 DEG C of gel in 1.5h or so
Property is good.
Comparative example 1
Suitable tap water is added in container, DW-3 type digital display electric mixer switch is opened, adjusts mixing speed
About 400r/min makes water form whirlpool, then sequentially adds 2% (mass percent) partially hydrolyzed polyacrylamide (PHPA), and 0.2%
(mass percent) sodium hydrogensulfite (antioxidant), 1% (mass percent) carboxymethyl cellulose (anti-dehydrating agent), 2.5%
(mass percent) aluminium oxide (structure reinforcing agent)；It is added 0.2% aluminium citrate (crosslinking agent), is measured after plastic after completely dissolution
The compressive resistance of resulting polymers gel, compressive resistance 0.057MPam-1。
In Examples 1 to 3 and comparative example 1, using the pressure measuring unit of the general N80 pipe processing in oil field, as shown in Figure 1,
The compressive resistance of polymer gel is by the device to test.Pressure measuring unit include nitrogen cylinder, surge tank, six-way valve, gelling vessel,
Temperature-controlling system, temperature measurer, pressure sensor and computer.Pressure reducing valve is successively arranged on connecting line between nitrogen cylinder and surge tank
And threeway, the third mouth of threeway connect constant-flux pump；The connecting line of surge tank and six-way valve is equipped with silica gel；Six-way valve respectively with
Pressure gauge, silica gel, pressure sensor are connected with gelling vessel, and gelling vessel is separately connected temperature-controlling system and temperature measurer；Pressure passes
Sensor is connected to computer.
In experiment, height of the polymer gel in N80 casing is 70cm.Polymer gel compressive resistance test condition:
30-70 DEG C of temperature.
In embodiment 2, the compressive strength of polymer gel is tested using electronic universal tester, test condition: temperature 25
DEG C, compression speed 4mm/min, shearing stress 1N/mm2, intensity calculates according to initial cross sectional.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (9)
1. a kind of kill-job polymer gel, by partially hydrolyzed polyacrylamide (PHPA), chromium acetate, thiocarbamide, structure reinforcing agent and water group
At；Wherein, in terms of the gross mass of the kill-job polymer gel, the mass percent of partially hydrolyzed polyacrylamide (PHPA) is
1.5%~4%, the mass percent of chromium acetate is 0.1%~0.4%, the mass percent of thiocarbamide is 0.05%~0.2%,
The mass percent of structure reinforcing agent is 1%~7%；Surplus is water；
The structure reinforcing agent is sodium-based montmorillonite, cornstarch or organo montmorillonite；
The degree of hydrolysis of the partially hydrolyzed polyacrylamide (PHPA) is 5%-20%, and molecular weight is 4,000,000~8,000,000；
The grain diameter of the cornstarch is 12.10 μm~17.07 μm.
2. kill-job polymer gel according to claim 1, it is characterised in that: the partially hydrolyzed polyacrylamide (PHPA)
Mass percent is 2%；The mass percent of the chromium acetate is 0.2%；The mass percent of the thiocarbamide is 0.2%.
3. kill-job polymer gel according to claim 1, it is characterised in that: the quality percentage of the structure reinforcing agent
Number is 5%~7%.
4. kill-job polymer gel according to claim 1, it is characterised in that: the structure reinforcing agent is sodium Ji Mengtuo
When native, mass percent 7%；When the structure reinforcing agent is cornstarch, mass percent 5%.
5. the preparation method of kill-job polymer gel according to any one of claims 1 to 4 includes the following steps: stirring
It mixes down, structure reinforcing agent is added into water, is dispersed using ultrasonic oscillator, with high-speed stirring mixer in 400~600r/
It is stirred under min revolving speed；Then thiocarbamide, partially hydrolyzed polyacrylamide (PHPA) are sequentially added, chromium acetate, plastic are added after completely dissolution.
6. preparation method according to claim 5, it is characterised in that: the time of the stirring is 30min-120min.
7. kill-job polymer gel according to any one of claims 1 to 4 answering in oil reservoir or gas reservoir insufficient balance well completion
With.
8. application according to claim 7, it is characterised in that: the oil reservoir or gas reservoir are low-temperature reservoir or low temperature gas reservoir.
9. application according to claim 8, it is characterised in that: the formation temperature of the low-temperature reservoir or low temperature gas reservoir is 30
~70 DEG C.
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| CN107459291B (en) * | 2017-09-05 | 2020-09-18 | 广西诗瑞科技有限公司 | Environment-friendly impermeable bentonite and preparation method thereof |
| CN110591679B (en) * | 2019-10-16 | 2020-09-18 | 西南石油大学 | Granular profile control agent adaptive to size of pore throat of stratum and preparation method thereof |
| CN111205836A (en) * | 2020-02-09 | 2020-05-29 | 西南石油大学 | Preparation method and degradation prediction method of recyclable high-density liquid rubber plug |
| CN111410943B (en) * | 2020-03-16 | 2022-10-04 | 中国石油天然气股份有限公司 | Composite gel well killing rubber plug capable of being quickly gelatinized and weighted at high temperature and preparation method thereof |
| CN111484653B (en) * | 2020-05-11 | 2021-06-29 | 中国石油大学(北京) | Xanthan gum composite gel for underbalanced drilling and preparation method and application thereof |
| CN114539997B (en) * | 2022-02-24 | 2023-04-21 | 大庆汇联技术开发有限公司 | Gel for low-cost, clean and solid-free well killing and preparation method thereof |
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