CN115477491B - Superfine early strength agent and cement slurry for low-temperature well cementation based on chemical-mechanical method - Google Patents
Superfine early strength agent and cement slurry for low-temperature well cementation based on chemical-mechanical method Download PDFInfo
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- CN115477491B CN115477491B CN202211172289.6A CN202211172289A CN115477491B CN 115477491 B CN115477491 B CN 115477491B CN 202211172289 A CN202211172289 A CN 202211172289A CN 115477491 B CN115477491 B CN 115477491B
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- 239000004568 cement Substances 0.000 title claims abstract description 108
- 239000002002 slurry Substances 0.000 title claims abstract description 40
- 238000010297 mechanical methods and process Methods 0.000 title abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 92
- 239000000243 solution Substances 0.000 claims abstract description 83
- 238000003756 stirring Methods 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002270 dispersing agent Substances 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 25
- 238000002360 preparation method Methods 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 239000012670 alkaline solution Substances 0.000 claims abstract description 13
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 11
- 238000007873 sieving Methods 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011575 calcium Substances 0.000 claims abstract description 7
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 7
- 239000003129 oil well Substances 0.000 claims description 28
- 239000007864 aqueous solution Substances 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 16
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 10
- -1 carboxymethyl carboxyethyl Chemical group 0.000 claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 5
- 239000004111 Potassium silicate Substances 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 5
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- WUGQZFFCHPXWKQ-UHFFFAOYSA-N Propanolamine Chemical compound NCCCO WUGQZFFCHPXWKQ-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 4
- 229910021538 borax Inorganic materials 0.000 claims description 4
- 229920003064 carboxyethyl cellulose Polymers 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- RBNPOMFGQQGHHO-UHFFFAOYSA-N glyceric acid Chemical compound OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 claims description 4
- LJCNRYVRMXRIQR-OLXYHTOASA-L potassium sodium L-tartrate Chemical compound [Na+].[K+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O LJCNRYVRMXRIQR-OLXYHTOASA-L 0.000 claims description 4
- 229940074439 potassium sodium tartrate Drugs 0.000 claims description 4
- 235000011006 sodium potassium tartrate Nutrition 0.000 claims description 4
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims description 4
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- RRDQTXGFURAKDI-UHFFFAOYSA-N formaldehyde;naphthalene-2-sulfonic acid Chemical compound O=C.C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 RRDQTXGFURAKDI-UHFFFAOYSA-N 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- PNLUGRYDUHRLOF-UHFFFAOYSA-N n-ethenyl-n-methylacetamide Chemical compound C=CN(C)C(C)=O PNLUGRYDUHRLOF-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 229920001732 Lignosulfonate Polymers 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 239000013530 defoamer Substances 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004575 stone Substances 0.000 abstract description 11
- 230000008719 thickening Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 239000012467 final product Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000013505 freshwater Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000001376 precipitating effect Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- YIBPLYRWHCQZEB-UHFFFAOYSA-N formaldehyde;propan-2-one Chemical class O=C.CC(C)=O YIBPLYRWHCQZEB-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- OVHHHVAVHBHXAK-UHFFFAOYSA-N n,n-diethylprop-2-enamide Chemical compound CCN(CC)C(=O)C=C OVHHHVAVHBHXAK-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QKZIVVMOMKTVIK-UHFFFAOYSA-M anilinomethanesulfonate Chemical group [O-]S(=O)(=O)CNC1=CC=CC=C1 QKZIVVMOMKTVIK-UHFFFAOYSA-M 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a superfine early strength agent and cement slurry for low-temperature well cementation based on a chemical-mechanical method. The preparation method of the early strength agent for low-temperature well cementation comprises the following steps: adding a dispersing agent into the alkaline solution A to obtain a solution B; simultaneously dropwise adding a calcium source solution and a silicon source solution into the solution B to obtain a solution C; stirring the solution C to obtain a precipitate; drying the precipitate, grinding and sieving to obtain the final product. On the basis of the early strength agent for low-temperature well cementation, the cement slurry for well cementation is further provided, and the cement slurry comprises the following components in mass: 100 parts of cement, 2-6 parts of a fluid loss agent, 0.5-2 parts of a dispersing agent, 2-6 parts of an early strength agent, 44-46 parts of water, 0.5-2 parts of a retarder and 0.5-2 parts of a defoaming agent. The cement slurry system for well cementation containing the early strength agent for low-temperature well cementation has the advantages of good stability in low-temperature environment, no sedimentation phenomenon, rheological property meeting pumping requirements, adjustable thickening time, low water loss, quick development of early compressive strength of cement stones, and capability of being applied to low-temperature well cementation operation to realize effective sealing of oil and gas wells.
Description
Technical Field
The invention relates to a superfine early strength agent for low-temperature well cementation based on a chemical-mechanical method and cement slurry, belonging to the technical field of cement slurry.
Background
The main purpose of well cementation is to inject a cement slurry system into the annular space of the oil and gas well sleeve to form a good annular space sealing barrier to prevent oil and gas and water from flowing through. In the deep water oil gas development process, the performance of the well cementation cement slurry can be influenced due to the low temperature of the underground shallow layer. The low temperature can obviously reduce the cement hydration rate, so that the cement paste thickening time is prolonged, the compression strength of the cement stone is slow to develop, the shearing stress of the annular cement sheath is insufficient for supporting the casing, the cement waiting time is prolonged, and the well construction cost is increased. Therefore, in order to improve the cementing quality of the low-temperature cement slurry, the early strength development of the cementing slurry needs to be improved.
The early strength agent is one of key additives for improving the low-temperature early compressive strength of the well cementation cement slurry. The existing early strength agents for the oil well cement are mainly divided into chloride, sulfate, organic matters and the like, and have certain effect on improving the early compressive strength of the cement stone. However, studies have shown that: the chloride early strength agent can raise the yield value, permeability and sulfate corrosion resistance of cement paste; the sulfate early strength agent often has a compact structure due to the fact that the generation rate of early hydration products is too high, and has adverse effects on later strength, and meanwhile, a pipe column can be corroded; the mixing amount of the organic early strength agent is not easy to control, and excessive mixing amount can cause serious retarder, strength reduction and other problems. In addition, the research shows that the superfine mineral micropowder particle material has large specific surface area, so that the mechanical properties such as compressive strength and the like of the hydrated cement can be effectively improved. In order to improve the early strength of the cement stone under the low-temperature condition and overcome the problem of slow strength development of the cement stone under the low-temperature environment, it is necessary to provide an efficient and stable superfine early strength agent.
Disclosure of Invention
The invention aims to provide an early strength agent for low-temperature well cementation, which does not have the defect of sensitive addition of a polymer early strength agent, does not need to be additionally doped with a polymer for auxiliary activation, has nano-micron scale, and has dual functions of greatly improving the early compressive strength of well cementation cement slurry in a low-temperature environment.
By adopting the cement slurry system of the early strength agent material, the rheological property meets the pumping requirement, the thickening time can be adjusted according to the construction requirement, the water loss is low, the early compressive strength development is fast, and the quick sealing of a shaft under a low-temperature environment can be realized.
The invention provides a preparation method of an early strength agent for low-temperature well cementation, which comprises the following steps:
s1, adding a dispersing agent into an alkaline solution A to obtain a solution B;
s2, simultaneously dropwise adding a calcium source solution and a silicon source solution into the solution B to obtain a solution C;
s3, stirring the solution C to obtain a precipitate; and drying the precipitate, and grinding and sieving to obtain the early strength agent for low-temperature well cementation.
In the preparation method, in the step S1, the alkaline solution A is a sodium hydroxide aqueous solution and/or a potassium hydroxide aqueous solution, and the mass concentration is 20-50%;
the dispersing agent is at least one of monoisopropanolamine, monoethanolamine and n-propanolamine;
the mass ratio of the alkaline solution A to the dispersing agent is 100:1 to 4, specifically can be 100: 2-3, 100:2 or 100:3.
in the preparation method, the step S1 further comprises the step of stirring the solution B in a water bath with the temperature of 50-90 ℃;
the stirring speed is 500rpm plus or minus 50rpm, and the stirring time is 2-5 h;
the stirring function is to make different raw materials react in the solution, and simultaneously improve the dispersion uniformity of the solid phase in the solution, so as to ensure the full progress of the reaction process.
In the above preparation method, in step S2, the mass ratio of the solution B to the calcium source solution is 100:50 to 100, specifically 100: 50. 100: 60. 100: 70. 100: 80. 100:90 or 100:100;
the mass ratio of the solution B to the silicon source solution is 100:50 to 90, specifically 100: 50. 100: 60. 100: 70. 100:80 or 100:90;
the dripping time is 120-180 s;
the calcium source solution is at least one of a calcium chloride solution, a calcium sulfate solution and a calcium nitrate solution, and the concentration is 10% -50%, specifically can be 10%, 20%, 30%, 40% or 50%;
the silicon source solution is sodium silicate solution and/or potassium silicate solution, and the concentration is 10% -50%, specifically 10%, 20%, 30%, 40% or 50%.
In the preparation method, in the step S3, the stirring time is 40-80 min;
the drying temperature is 105+/-2 ℃ and the drying time is 24 hours+/-1 hour;
grinding in a ball milling mode, wherein the grinding time is 5-30 min, and sieving with a 500-1200 mesh sieve after grinding.
On the basis of the early strength agent for low-temperature well cementation, the invention further provides cement slurry for well cementation, which comprises the following components in parts by mass:
100 parts of cement, 2-6 parts of a fluid loss agent, 0.5-2 parts of a dispersing agent, 2-6 parts of an early strength agent, 44-46 parts of water, 0.5-2 parts of a retarder and 0.5-2 parts of a defoaming agent;
the cement slurry for well cementation has the composition specifically shown in any one of the following 1) to 6):
1) 100 parts of cement, 6 parts of a fluid loss agent, 2 parts of a dispersing agent, 6 parts of an early strength agent, 46 parts of water, 2 parts of a retarder and 2 parts of a defoaming agent;
2) 100 parts of cement, 5 parts of a fluid loss agent, 1.5 parts of a dispersing agent, 5 parts of an early strength agent, 46 parts of water, 2 parts of a retarder and 2 parts of a defoaming agent;
3) 100 parts of cement, 4 parts of a fluid loss agent, 1.5 parts of a dispersing agent, 4 parts of an early strength agent, 45 parts of water, 2 parts of a retarder and 1.5 parts of a defoaming agent;
4) 100 parts of cement, 4 parts of a fluid loss agent, 1 part of a dispersing agent, 4 parts of an early strength agent, 45 parts of water, 1.5 parts of a retarder and 1 part of a defoaming agent;
5) 100 parts of cement, 3 parts of a fluid loss agent, 0.5 part of a dispersing agent, 3 parts of an early strength agent, 44 parts of water, 1 part of a retarder and 1 part of a defoaming agent;
6) 100 parts of cement, 2 parts of a fluid loss agent, 0.5 part of a dispersing agent, 2 parts of an early strength agent, 44 parts of water, 0.5 part of a retarder and 0.5 part of a defoaming agent;
in the cement slurry for well cementation, the early strength agent is the early strength agent for low-temperature well cementation;
the cement is G-grade oil well cement;
the fluid loss agent is one or more of carboxymethyl carboxyethyl cellulose, N-diethyl acrylamide, N-methyl-N-vinylacetamide and maleic anhydride;
the dispersing agent is one or more of sulfonated acetone formaldehyde polycondensate, lignosulfonate, sulfonated styrene-maleic anhydride copolymer and beta-naphthalene sulfonic acid formaldehyde condensate;
the retarder is one or more of sodium borate, potassium sodium tartrate and tartaric acid;
the defoaming agent is one or more of organosilicon polyether copolymer, polyoxyethylene polyoxypropylene amine ether and polyoxypropylene glycerol ether.
The cement paste for well cementation can be prepared according to the following steps:
1) Dry-mixing the cement, the dispersing agent and the early strength agent to obtain mixed dry powder;
2) Dissolving the filtrate reducer, the retarder and the defoamer in water, and uniformly stirring to obtain a mixed water solution;
3) And adding the mixed dry powder into the mixed aqueous solution, and uniformly stirring to obtain the cement paste for well cementation.
The invention relates to a low-temperature well cementation process under the environment of 20 ℃.
Compared with the prior art, the invention has the following advantages and effects:
1. compared with the existing early strength agent, the early strength agent for the oil well cement has the advantages that the preparation method of the early strength agent is simple, has nano-micron scale, is easy to control the addition, has no corrosion to a pipe column, has good effect of improving the early compressive strength of cement stones in a low-temperature environment, and has no adverse effect on performances such as water loss, rheological property and the like of cement paste;
2. the cement slurry system for well cementation containing the early strength agent for low-temperature well cementation provided by the invention has the advantages of good stability in low-temperature environment, no sedimentation phenomenon, adjustable thickening time, low water loss, quick development of early compressive strength of cement stones, and capability of being applied to low-temperature well cementation operation to realize effective sealing of oil and gas wells.
Detailed Description
The experimental methods used in the following examples are conventional methods unless otherwise specified.
Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
Example 1 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement
To 100 parts by weight of 50wt% NaOH alkaline solution A, 1 part by weight of monoisopropanolamine dispersing agent was added to prepare solution B, and the solution B was placed in a 50℃water bath and stirred at 500 rpm.+ -. 50rpm. To 100 parts of solution B, 50 parts of 10wt% calcium chloride solution and 90 parts of 50wt% sodium silicate solution were added dropwise for 120 seconds to prepare solution C. Continuously stirring the solution C for 40min, precipitating after stirring, taking out the lower layer of precipitate, and putting into a drying box for drying for 24 hours plus or minus 1 hour, wherein the drying temperature is 105 ℃ plus or minus 2 ℃. And grinding the dried materials for 5min by using a ball mill, and sieving the ground materials by using a 500-mesh sieve to obtain the prepared superfine early strength agent (the particle size is below 30 microns) for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 2 parts by weight of carboxymethyl carboxyethyl cellulose, 0.5 part by weight of sulfonated acetone formaldehyde polycondensate, 2 parts by weight of early strength agent are dry-mixed into dry powder, 44 parts by weight of fresh water is measured, 0.5 part by weight of sodium borate and 0.5 part by weight of organic silicon polyether copolymer are weighed and dissolved in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second, thus obtaining the cement paste system containing the early strength agent.
Example 2 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement
To 100 parts by weight of 40wt% KOH alkaline solution A was added 2 parts by weight of monoethanolamine dispersant to prepare solution B, and the solution B was placed in a 70℃water bath and stirred at 500 rpm.+ -. 50rpm. To 100 parts of solution B, 60 parts of a 20wt% calcium sulfate solution and 80 parts of a 40wt% potassium silicate solution were added dropwise for 140 seconds to prepare solution C. Continuously stirring the solution C for 50min, precipitating after stirring, taking the lower layer precipitate, and putting the lower layer precipitate into a drying box for drying for 24 hours plus or minus 1 hour, wherein the drying temperature is 105 ℃ plus or minus 2 ℃. And grinding the dried materials for 10min by using a ball mill, and sieving the ground materials by using a 800-mesh sieve to obtain the prepared superfine early strength agent (the particle size is below 15 microns) for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 3 parts by weight of N, N-diethyl acrylamide, 0.5 part by weight of lignocellulose sulfonate, 3 parts by weight of early strength agent are dry-mixed into dry powder, 44 parts by weight of fresh water is measured, 1 part by weight of potassium sodium tartrate and 1 part by weight of polyoxyethylene polyoxypropylene amine ether are weighed and dissolved in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second, thus obtaining the cement paste system containing the early strength agent.
Example 3 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement
100 parts by weight of 30% NaOH alkaline solution A is added with 2 parts by weight of n-propanol amine dispersant to prepare solution B, and the solution B is placed into a 70 ℃ water bath kettle to be stirred at 500rpm +/-50 rpm. To 100 parts of solution B, 70 parts of 30wt% calcium sulfate solution and 70 parts of 30wt% sodium silicate solution were added dropwise for 150 seconds to prepare solution C. Continuously stirring the solution C for 60min, precipitating after stirring, taking the lower layer precipitate, and putting into a drying box for drying for 24 hours plus or minus 1 hour. The drying temperature can be 105+/-2 ℃. And grinding the dried materials for 20min by using a ball mill, and sieving the ground materials by using a 1000-mesh sieve to obtain the prepared superfine early strength agent (the particle size is below 13 microns) for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 4 parts by weight of N-methyl-N-vinylacetamide, 1 part by weight of sulfostyrene-maleic anhydride copolymer, 4 parts by weight of early strength agent, dry-mixing to obtain dry powder, weighing 45 parts by weight of fresh water, weighing 1.5 parts by weight of tartaric acid, and 1 part by weight of polyoxypropylene glycerol ether, dissolving in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second to obtain the cement paste system containing the early strength agent.
Example 4 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement
To 100 parts by weight of 30% KOH alkaline solution A, 3 parts by weight of monoisopropanolamine dispersant was added to prepare solution B, and the solution B was placed in a 80℃water bath and stirred at 500 rpm.+ -. 50rpm. To 100 parts of solution B, 80 parts of 40wt% calcium nitrate solution and 60 parts of 20wt% potassium silicate solution were added dropwise for 160 seconds to prepare solution C. Continuously stirring the solution C for 70min, precipitating after stirring, taking the lower layer of precipitate, and putting into a drying box for drying for 24 hours plus or minus 1 hour. The drying temperature can be 105+/-2 ℃. And grinding the dried materials for 25min by using a ball mill, and sieving the ground materials with a 1000-mesh sieve to obtain the prepared superfine early strength agent for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 4 parts by weight of maleic anhydride, 1.5 parts by weight of beta-naphthalene sulfonic acid formaldehyde condensate, 4 parts by weight of early strength agent are dry-mixed into dry powder, 45 parts by weight of fresh water is measured, 2 parts by weight of potassium sodium tartrate and 1.5 parts by weight of polyoxypropylene glycerol ether are weighed and dissolved in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second to obtain the cement slurry system containing the early strength agent.
Example 5 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement:
3 parts by weight of monoisopropanolamine dispersant is added into 100 parts by weight of KOH alkaline solution A with 20% concentration to prepare solution B, and the solution B is placed into a water bath kettle with the temperature of 90 ℃ for stirring, and the rotating speed is 500rpm plus or minus 50rpm. To 100 parts of solution B, 90 parts of 50wt% calcium sulfate solution and 50 parts of 10wt% sodium silicate solution were added dropwise for 170s to prepare solution C. Continuously stirring the solution C for 80min, precipitating after stirring, taking the lower layer of precipitate, and putting into a drying box for drying for 24 hours plus or minus 1 hour. The drying temperature can be 105+/-2 ℃. And grinding the dried materials for 30min by using a ball mill, and sieving the ground materials by using a 1200-mesh sieve to obtain the prepared superfine early strength agent (the particle size is below 2 microns) for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 5 parts by weight of N, N-diethyl acrylamide, 1.5 parts by weight of sulfonated aldehyde ketone polycondensate, 5 parts by weight of early strength agent are dry-mixed into dry powder, 46 parts by weight of fresh water is measured, 2 parts by weight of sodium borate is weighed, and 2 parts by weight of organosilicon polyether copolymer is dissolved in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second to obtain the cement paste system containing the early strength agent.
Example 6 preparation of early strength Agents for oil well Cement and well Cement paste
1. Early strength agent for preparing oil well cement
100 parts by weight of 20% NaOH alkaline solution A is added with 3 parts by weight of n-propanol amine dispersant to prepare solution B, and the solution B is placed into a water bath kettle at 90 ℃ to be stirred at 500rpm +/-50 rpm. To 100 parts of the solution B, 100 parts of a 30wt% calcium chloride solution and 50 parts of a 30wt% potassium silicate solution were added dropwise for 170 seconds to prepare a solution C. And continuously stirring the solution C for 80min, precipitating after stirring, taking the lower precipitate, and putting the lower precipitate into a drying box for drying for 24 hours plus or minus 1 hour. The drying temperature can be 105+/-2 ℃. And grinding the dried materials for 30min by using a ball mill, and sieving the ground materials by using a 1200-mesh sieve to obtain the prepared superfine early strength agent for low-temperature well cementation.
2. Preparation of well cementing slurry
100 parts by weight of G-grade oil well cement, 6 parts by weight of carboxymethyl carboxyethyl cellulose, 2 parts by weight of sulfonated styrene-maleic anhydride copolymer, 6 parts by weight of early strength agent are dry-mixed into dry powder, 46 parts by weight of fresh water is measured, 2 parts by weight of tartaric acid is weighed, and 2 parts by weight of polyoxyethylene polyoxypropylene amine ether is dissolved in water. And pouring the aqueous solution into a stirring cup, stirring at a rotating speed of 4000+/-200 r/min by using a corrugated stirrer, adding the weighed mixed dry powder into the mixed aqueous solution at a constant speed within 15 seconds, covering a cover of the stirring cup, and stirring at a rotating speed of 12000+/-500 r/min for 35 seconds+/-1 second to obtain the cement paste system containing the early strength agent.
Comparative example 1,
1. The early strength agent for sodium sulfate oil well cement commonly used in the prior art is adopted.
2. Preparing well cementation cement paste: the remaining components and amounts were identical to example 2 except that the early strength agent was changed to the same amount of sodium sulfate.
Comparative example 2,
1. No early strength agent;
2. preparing well cementation cement paste: the other components and contents were the same as in example 2 except that the early strength agent was not contained.
Comparative example 3,
1. The preparation process of the early strength agent is the same as that of example 2 except that the mesh number is 100 mesh;
2. preparing well cementation cement paste: the components and amounts were the same as in example 2 except that the early strength agent was changed to 100 mesh.
Application example 1, performance test of well cementing slurry
After preparing cement slurries according to the API specification, the cement slurries of examples 1 to 6 and comparative examples 1 to 3 were subjected to performance tests according to the well cementation test standard API10B-2-2005, and the results are shown in table 1.
TABLE 1 Performance test of various cement slurries
As can be seen from the data in Table 1, compared with comparative example 1, the early strength agent for oil well cement provided by the invention has better effect in well cementing cement slurry than the effect of preparing oil well cement by sodium sulfate in the prior art, has lower influence on cement slurry workability, has better effect in improving early compressive strength, and maximally improves the compressive strength of cement stones 12h and 24h by 120.8% and 112.6% respectively.
Compared with comparative example 2, the early strength agent for oil well cement provided by the invention has good application effect in well cementing cement slurry, improves the slurry stability of the cement slurry, has small influence on thickening time, can adjust the thickening time through a retarder, reduces water loss, obviously promotes the hydration process of the cement slurry, and improves the early pressure resistance of cement stones 12h and 24h by 278.6% and 218% respectively at maximum.
Compared with comparative example 3, the early strength agent for oil well cement provided by the invention has smaller particle size and more effectively improves the early compressive strength of the cement stone. The early compressive strength of the cement stones 12h and 24h in the examples is improved by 101.3% and 89.8% respectively at maximum.
In conclusion, according to analysis, the cement paste prepared by the early strength agent for the oil well cement has the advantages of good stability, low water loss, good thickening controllability, good rheological property, high early compressive strength and capability of meeting the well cementation construction requirements. The performance is beneficial to reducing the cement paste waiting time, reducing the waiting time of various construction operations after well cementation, reducing the operation cost and improving the exploitation efficiency of an oil gas well.
Claims (6)
1. The preparation method of the early strength agent for low-temperature well cementation comprises the following steps:
s1, adding a dispersing agent into an alkaline solution A to obtain a solution B;
the alkaline solution A is sodium hydroxide aqueous solution and/or potassium hydroxide aqueous solution, and the mass concentration is 20-50%;
the dispersing agent is at least one of monoisopropanolamine, monoethanolamine and n-propanolamine;
the mass ratio of the alkaline solution A to the dispersing agent is 100:1 to 4;
s2, simultaneously dropwise adding a calcium source solution and a silicon source solution into the solution B to obtain a solution C;
the mass ratio of the solution B to the calcium source solution is 100: 50-100;
the mass ratio of the solution B to the silicon source solution is 100: 50-90;
the dripping time is 120-180 s;
the calcium source solution is at least one of a calcium chloride solution, a calcium sulfate solution and a calcium nitrate solution, and the concentration is 10% -50%;
the silicon source solution is sodium silicate solution and/or potassium silicate solution, and the concentration is 10% -50%;
s3, stirring the solution C to obtain a precipitate; drying the precipitate, and grinding and sieving to obtain the early strength agent for low-temperature well cementation;
the stirring time is 40-80 min;
the drying temperature is 105+/-2 ℃ and the drying time is 24 hours+/-1 hour;
grinding in a ball milling mode, wherein the grinding time is 5-30 min, and sieving with a 500-1200 mesh sieve after grinding.
2. The method of manufacturing according to claim 1, characterized in that: step S1 also comprises the step of stirring the solution B in a water bath with the temperature of 50-90 ℃;
the stirring speed is 500rpm plus or minus 50rpm, and the stirring time is 2-5 h.
3. An early strength agent for low-temperature well cementation prepared by the method of claim 1 or 2.
4. The cement slurry for well cementation comprises the following components in parts by mass:
100 parts of cement, 2-6 parts of a fluid loss agent, 0.5-2 parts of a dispersing agent, 2-6 parts of an early strength agent, 44-46 parts of water, 0.5-2 parts of a retarder and 0.5-2 parts of a defoaming agent;
the early strength agent is the early strength agent for low-temperature well cementation according to claim 3;
the cement is G-grade oil well cement;
the fluid loss agent is one or more of carboxymethyl carboxyethyl cellulose, N-diethyl acrylamide, N-methyl-N-vinylacetamide and maleic anhydride;
the dispersing agent is one or more of sulfonated aldehyde ketone polycondensate, lignosulfonate, sulfonated styrene-maleic anhydride copolymer and beta-naphthalene sulfonic acid formaldehyde condensate;
the retarder is one or more of sodium borate, potassium sodium tartrate and tartaric acid;
the defoaming agent is one or more of organosilicon polyether copolymer, polyoxyethylene polyoxypropylene amine ether and polyoxypropylene glycerol ether.
5. The method for preparing cement slurry for well cementation according to claim 4, comprising the following steps:
1) Dry-mixing the cement, the dispersing agent and the early strength agent to obtain mixed dry powder;
2) Dissolving the filtrate reducer, the retarder and the defoamer in water, and uniformly stirring to obtain a mixed aqueous solution;
3) And adding the mixed dry powder into the mixed aqueous solution, and uniformly stirring to obtain the cement slurry for well cementation.
6. Use of the early strength agent for low-temperature well cementation of claim 3 and the cement slurry for well cementation of claim 4 in low-temperature well cementation.
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