CN110734259A - thermoelastic heavy oil thermal recovery well cementation cement - Google Patents
thermoelastic heavy oil thermal recovery well cementation cement Download PDFInfo
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- 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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
- C09K8/422—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells specially adapted for sealing expandable pipes, e.g. of the non-hardening type
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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
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
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- 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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
The invention discloses thermoelastic thickened oil thermal recovery well cementing cement, which belongs to the technical field of oil and gas field well cementing cement and comprises the following components, by weight, 50-75% of cement, 20-40% of siliceous materials, 0.2-2% of fibers, 0.5-10% of latex and 1-8% of thermally reversible cross-linking reaction polymers, wherein the cement is types of Portland cement A-grade, G-grade and D-grade oil well cement.
Description
Technical Field
The invention relates to kinds of oil and gas field well cementation cement, in particular to kinds of thermoelastic thickened oil thermal recovery well cementation cement, and belongs to the technical field of oil and gas field well cementation materials.
Background
China has rich thick oil resources, and the exploration and the reserve control of China reach 16 multiplied by 108However, because the viscosity and the density of the thick oil are high, the flow resistance in the stratum is large, and the recovery efficiency is low in a conventional recovery mode.
At present, the commonly used high-temperature resistant cement is G-grade oil well cement and quartz sand, and the cement slurry system has -determined high-temperature resistant performance, but in the engineering application process, the problems of cement strength decline, wellhead lifting and the like are found after two-three high-temperature and low-temperature cycles of steam thermal recovery, so that the production is influenced, and the cement must be maintained or even scrapped.
With the progress of research, a new understanding is provided for the failure mechanism of a cement sheath of a thickened oil steam thermal recovery well, cement slurry is solidified under the condition of bottom static temperature, when steam is injected into the well, the whole well is heated to high temperature, the cement sheath and a casing pipe are heated to expand, however, the expansion coefficient of the casing pipe is far larger than that of the cement sheath, so that different parts of the cement sheath are in completely different stress states, the cement sheath at the th interface is in annular and vertical tension, the cement sheath at the second interface is in a compression state, and the complexity of a mechanical environment causes the cement sheath to be completely damaged after two or three times of high-temperature cycles.
In order to improve the service life of the cement sheath under the environment condition of high-temperature steam flooding or steam huff and puff, a great deal of research is focused on developing a novel high-temperature-resistant well cementation cement slurry system for improving the high-temperature resistance of the set cement, the application number is CN201410028033.7, the name is high-temperature-resistant thermal recovery cements and invention patents of the preparation method thereof, the adopted thermal recovery cements are aluminate cement clinker, phosphorous slag and slag for mixing, then the mixture is poured into a ball mill for grinding, and the powder to be mixed is ground to the Bosch's specific surface area of 250-300m2The invention discloses a preparation method of high-temperature resistant cement slurry, which is characterized in that ceramic fiber and rubber powder are added and mixed for 10 minutes, the high-temperature resistant cement slurry is excellent in high-temperature resistance, the application number is CN200910011363.4, the name is invention patents of the preparation method of the high-temperature resistant cement slurry, barium salt with the concentration of 0.5-5% of the cement content is added into aluminate cement for well cementation as an anti-recession additive, boric acid, borate, organic phosphorus salt, organic acid and the like are added in the mixing process, so that the required high-temperature resistant cement slurry 21012101 is obtained, the application number is CN20147386.X, the name is high-temperature resistant cement slurry and the invention patents of the underground high-temperature resistant cement slurry well cementation and well cementation process methods, the high-temperature resistant cement is mainly composed of calcium aluminate and dicalcium silicate, the temperature resistance is enabled to reach 800 ℃, the pressure resistance is more than 60MPa, and.
However, the cement has high cost, few additives, and weak toughness, tensile strength and integrity of set cement, and is limited in practical application.
Disclosure of Invention
The invention provides thermoelastic thickened oil thermal recovery well cementation cement by overcoming the problems of the existing thickened oil thermal recovery well cementation cement sheath.
In order to achieve the above object, the technical solution of the present invention is as follows:
the invention provides thermoelastic thickened oil thermal recovery well cementing cement, which comprises 50-75% of cement, 20-40% of siliceous material, 0.2-2% of fiber, 0.5-10% of latex and 1-8% of thermally reversible crosslinking reaction polymer, wherein the cement is of Portland cement A-grade, G-grade and D-grade oil well cement.
The thermal reversible crosslinked polymer comprises or more of thermal reversible crosslinked ethylene propylene rubber, thermal reversible crosslinked epoxy resin, thermal reversible crosslinked polyurethane, thermal reversible crosslinked butyl rubber, thermal reversible crosslinked acrylate rubber, thermal reversible crosslinked polyimide resin, thermal reversible crosslinked polyphenylene sulfide and thermal reversible crosslinked polyether ether ketone.
The latex has improved xonotlite C6S6Crystal structure of H.
The fiber is basalt fiber, the fiber length is 1-9mm, the fiber diameter is larger than 15um, the fiber strength is larger than 0.5N/Tex, the surface of the fiber is coated with an alkali-resistant impregnating compound, and the alkali resistance of the fiber is larger than 80%.
The siliceous material is quartz sand or quartz powder; SiO in the siliceous material2The content is more than 85 percent, and the specific surface area is more than 350m3Per kg, the grain diameter D90 is less than or equal to 80 mu m.
The latex is or more of styrene-butadiene latex, butyronitrile latex, styrene-acrylic latex, vinyl acetate latex, vinyl chloride latex, polyacrylamide latex and acrylate latex.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the cement sheath comprises 50-75% of cement, 20-40% of siliceous materials, 0.2-2% of fibers, 0.5-10% of latex and 1-8% of thermo-reversible cross-linking reaction polymers, wherein the cement is of Portland cement A-grade, G-grade and D-grade oil well cements, and the fibers, the latex and the thermo-reversible cross-linking reaction polymers can effectively improve the toughness and mechanical properties of the set cement, and when a casing pipe is heated and expanded, a cement sheath is compressed to generate deformation without cracking, so that the integrity of the cement sheath is not damaged.
2. The invention discloses a thermal reversible crosslinked polymer which comprises or more of thermal reversible crosslinked ethylene propylene rubber, thermal reversible crosslinked epoxy resin, thermal reversible crosslinked polyurethane, thermal reversible crosslinked butyl rubber, thermal reversible crosslinked acrylate rubber, thermal reversible crosslinked polyimide resin, thermal reversible crosslinked polyphenylene sulfide and thermal reversible crosslinked polyether ether ketone, wherein rigid particles exist in a cement ring at low temperature, the polymer is depolymerized to form a thermoplastic monomer along with the rise of temperature, a casing shrinks after the temperature is reduced, the thermoplastic polymer monomer overflows from the cement ring to enter a micro-annular gap between the cement ring and the casing, and is secondarily polymerized to form a polymer with fixed mechanical property, so that the cement ring is ensured to continuously have the functions of stabilizing the casing and dividing the stratum, the problem of lifting of the casing is avoided, the service life of the cement ring is prolonged, and the maintenance cost of an oil field in heavy oil thermal recovery is reduced.
3. The latex of the present invention improves xonotlite C6S6The crystal structure of H improves the length-diameter ratio of the acicular fiber, improves the strength of the set cement, and has the problem of strength attenuation caused by coarsening of hardened wollastonite grains.
4. The invention relates to a cement sheath, which is characterized in that the fiber is basalt fiber, the fiber length is 1-9mm, the fiber diameter is more than 15um, the fiber strength is more than 0.5N/Tex, the fiber surface is coated with an alkali-resistant impregnating compound, the fiber alkali resistance is more than 80%, the durability of the fiber under the high-temperature alkaline environment condition of well cementation cement is improved through optimizing the chemical composition proportion of the fiber, coating the alkali-resistant impregnating compound for protection, adjusting the length-diameter ratio of the fiber and other processes and technical links, and the tensile action can be still achieved even under the high-temperature alkaline environment, so that the toughness and the compressive strength of the cement sheath are improved.
5. The invention has the advantages of easily obtained materials, complete admixture system and simple construction process, and is beneficial to for using products.
Drawings
FIG. 1 is a SEM microstructure of a hydrated product of a sample No. M1 cured at 60 ℃ for 7 days.
FIG. 2 is a SEM microstructure of a hydrated product of a sample No. M2 cured at 60 ℃ for 7 days.
FIG. 3 is a SEM microstructure of a hydrated product of a sample No. M1 cured at 350 ℃ for 7 days.
FIG. 4 is a SEM microstructure of a hydrated product of a sample No. M6 cured at 350 ℃ for 7 days.
FIG. 5 is a schematic cross-sectional view of a cement sheath integrity testing apparatus.
Detailed Description
The present invention is further illustrated in detail with reference to examples, but the embodiments of the present invention are not limited thereto.
In the raw materials used in the following examples, the cement is oil well cement produced by Jiahua special cement GmbH; quartz sand was produced by Wenjiang Andzhitao quartz sand works, fibers were provided by Chengdibo Bori geotechnical engineering, Inc., and latex and thermoreversible crosslinked polymer were both commercially available.
Example 1
As a preferred embodiment of of the invention, referring to the attached drawings of the specification, namely figure 1, figure 2, figure 3 and figure 4, the embodiment discloses thermoelastic thickened oil thermal recovery well cementing cements, belonging to the technical field of oil and gas field well cementing cements, the thermoelastic thickened oil thermal recovery well cementing cement comprises the following components in proportion of 50-75% of cement, 20-40% of siliceous material, 0.2-2% of fiber, 0.5-10% of latex and 1-8% of thermally reversible crosslinking reaction polymer, wherein the cement is types of Portland cement A-grade, G-grade and D-grade oil wells.
In the embodiment, the outer admixture comprises the following raw materials in percentage by weight:
10kg of samples are prepared according to the proportion in the table, the water cement ratio is 0.44, the added water amount is the water consumption minus the weight of latex, the samples are prepared according to the experimental requirements of the cement strength in GB10238, the samples are put into a water bath curing box for curing at 60 ℃, and after 1d, the samples are demoulded and the compression strength and the breaking strength are detected. And curing the rest samples at 60 ℃ for 7d, and then putting the samples into a high-temperature high-pressure curing kettle for curing at 350 ℃ for 7 d. The specific composition of the example high temperature admixture is shown in the following table, wherein the composition No. M6 is a comparative sample:
FIGS. 1 and 2 are SEM micrographic images of M1 and M2 samples cured at 60 ℃ for 7 days, respectively. As shown in the figure, when the two samples are maintained at 60 ℃, the microstructure difference of the internal set cement is not large, the cement particles are fully hydrated, the external admixture particles are wrapped, and obvious external admixture powder particles cannot be seen. In fig. 2, it can be observed that basalt fiber is tightly combined with set cement.
FIGS. 3 and 4 are SEM micrographic images of M1 and M6 samples cured at 350 ℃ for 7 days, respectively. Comparing the two figures, the M1 has uniform distribution of cement stones inside, less pores, and the hydration products are distributed in a shape of tiny short fibers and are tightly combined with each other, wherein the white particles are the thermal reversible cross-linked polymer. A large amount of coarse fiber bundles exist among pores in the M6 sample, the fiber bundles are in a flower shape, are not tightly connected with each other, and have larger pores, so that the mechanical property of the cement stone is reduced.
Example 2
According to the schematic sectional structure diagram of the cement sheath integrity detection device shown in fig. 5, cement slurries are respectively prepared by adopting schemes M1, M2, M3, M4, M5 and M6, poured into the cement sheath-shaped mold shown in fig. 5 for molding, maintained at 60 ℃ for 7 days, then put into a high-temperature maintenance kettle, maintained at 350 ℃ for 3 days, then cooled to room temperature, heated to 350 ℃ again for maintenance for 3 days, and then heated up and down for 3 times. After the cement sheath is taken out, the integrity of the cement sheath formed by the samples M1, M2, M3, M4 and M5 is kept, and the cement sheath is well combined with the annular mold. The cement sheath formed by the sample M6 falls off from the annular mold, and the cement paste cracks.
Claims (6)
1, thermoelastic thickened oil thermal recovery well cementation cement, which is characterized in that the components comprise the following components in the corresponding proportion:
cement: 50-75%;
a siliceous material: 20 to 40 percent;
fiber: 0.2-2%;
latex: 0.5-10%;
1-8% of thermal reversible cross-linking reaction polymer, wherein the cement is types of Portland cement A-grade, G-grade and D-grade oil well cement.
2. The thermoelastic thickened oil thermal recovery well cementation cement of claim 1, wherein the thermo-reversible cross-linked polymer comprises or more of thermo-reversible cross-linked ethylene propylene rubber, thermo-reversible cross-linked epoxy resin, thermo-reversible cross-linked polyurethane, thermo-reversible cross-linked butyl rubber, thermo-reversible cross-linked acrylate rubber, thermo-reversible cross-linked polyimide resin, thermo-reversible cross-linked polyphenylene sulfide and thermo-reversible cross-linked polyether ether ketone.
3. The thermoelastic heavy oil thermal recovery cementing cement of claim 1, characterized in that: the latex has improved xonotlite C6S6Crystal structure of H.
4. The thermoelastic heavy oil thermal recovery cementing cement of claim 1, characterized in that: the fiber is basalt fiber, the fiber length is 1-9mm, the fiber diameter is larger than 15um, the fiber strength is larger than 0.5N/Tex, the surface of the fiber is coated with an alkali-resistant impregnating compound, and the alkali resistance of the fiber is larger than 80%.
5. The thermoelastic heavy oil thermal recovery cementing cement of claim 1, characterized in that: the siliceous material is quartz sand or quartz powder; SiO in the siliceous material2The content is more than 85 percent, and the specific surface area＞350m3Per kg, the grain diameter D90 is less than or equal to 80 mu m.
6. The thermoelastic thickened oil thermal recovery well cementation cement as claimed in claim 1, wherein the latex is or more of styrene-butadiene latex, butyronitrile latex, styrene-acrylic latex, vinyl acetate latex, vinyl chloride latex, polyacrylamide latex and acrylate latex.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233387A (en) * | 2020-03-23 | 2020-06-05 | 范永通 | Modified oil well cement-based composite material and preparation method thereof |
| CN112011323A (en) * | 2020-09-23 | 2020-12-01 | 盘锦天诚源科技有限公司 | Preparation method of profile control agent cellulose ethers for oil extraction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233387A (en) * | 2020-03-23 | 2020-06-05 | 范永通 | Modified oil well cement-based composite material and preparation method thereof |
| CN112011323A (en) * | 2020-09-23 | 2020-12-01 | 盘锦天诚源科技有限公司 | Preparation method of profile control agent cellulose ethers for oil extraction |
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