CN112707709B - High-strength low-hydration-heat low-density cement slurry system for well cementation and preparation method thereof - Google Patents
High-strength low-hydration-heat low-density cement slurry system for well cementation and preparation method thereof 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
- C04B28/14—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 calcium sulfate 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
- C09K8/46—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
- 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
- C09K8/473—Density reducing additives, e.g. for obtaining foamed cement compositions
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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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- 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
Abstract
The invention provides a high-strength low-hydration-heat low-density cement slurry system for well cementation and a preparation method thereof, wherein the high-strength low-hydration-heat low-density cement slurry system comprises the following components in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro silicon powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate and 65-75 parts of water; the system can also be added with additives such as retarder, fluid loss agent, drag reducer and the like according to needs. The cement paste system prepared by the invention has low density (1.20-1.30 g/cm) 3 ) Ensuring that the shaft annulus is completely sealed and fixed in an upward direction at one time; the strength is high (the strength is more than 7/10MPa at the normal pressure of 45 ℃/24h/48 h), and the sleeve can be better supported; it is suitable for the well cementation of oil and gas wells within the temperature range of 50-90 ℃. The performance conflict between the retarder and the coagulation promoting activator used in the existing cement paste system is eliminated, the convenient adjustment of the thickening time of the system is realized, and the well cementation quality of oil wells and gas wells is improved.
Description
Technical Field
The invention belongs to the technical field of well cementation, and particularly relates to a high-strength low-hydration-heat low-density cement slurry system for well cementation and a preparation method and application thereof.
Background
Along with the progress of petroleum exploration and development, the number of easily-lost strata such as low-pressure strata, weak strata and the like is increased, a low-density cement slurry system is gradually developed and perfected along with the treatment of the complex conditions, and along with the continuous development and popularization of deep well and ultra-deep well technologies, the easily-leaked strata of deep wells and ultra-deep wells can bring serious well leakage, so that the implementation of well cementation quality and subsequent yield increasing operation is seriously influenced. To improve the cementing quality of such complex well conditions, it is necessary to perfect a low density cement slurry system.
For example, chinese patent publication No. CN106396509B discloses a low-density high-strength cement slurry system with a wide application range, which is prepared from the following raw materials in parts by weight: 65-75 parts of low-density high-strength cement, 0.2-2 parts of AMPS polymer fluid loss agent, 0.05-0.2 part of polycarboxylate ether ester dispersant, 0.1-2 parts of inorganic aluminate early strength agent, 0.1-0.55 part of organic phosphate retarder, 0.1-0.2 part of organic silicon defoaming agent and 25-35 parts of distilled water. However, the cement paste system uses an inorganic aluminum salt early strength agent to activate low-density high-strength cement, the activating agent is weak-alkali strong acid salt, and the activating agent is converted into weak alkali after the temperature rises to play an activating role. The performance of the cement paste system is as follows: under the condition of 40-55 ℃, thickening time is longer (260-330 min), which brings risk to the anti-channeling of shallow well cementing, if the time needs to be shortened, an alkaline additive needs to be added, and a certain amount of activator needs to be added at the same time, the adjustment is relatively complicated; under the condition of 65-90 ℃, the thickening time is generally 160-220min, the thickening time is required to be prolonged when the thickening agent is used for a high-temperature deep well, and the risk of increasing the acidity of a system and separating and layering the system can be caused by adding an acidic retarder.
Disclosure of Invention
The first purpose of the invention is to provide low hydration heat portland cement which has the characteristics of low heat release rate, high later strength, good erosion resistance and the like, and ensures that the later solidification strength meets the requirements of the standard.
The invention also provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the low-hydration-heat portland cement, solves the defects of the existing low-density cement slurry system, eliminates the performance conflict between a retarder and a set accelerating activator used in the system, realizes convenient adjustment of the thickening time of the system, and improves the well cementation quality and the production benefit of oil and gas wells.
The third purpose of the invention is to provide a preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation.
The fourth purpose of the invention is to provide the application of the high-strength low-hydration-heat low-density cement paste system for well cementation in oil and gas wells.
In order to achieve the above purpose of the present invention, the present invention adopts the following technical scheme:
the invention provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in parts by weight: 25-35 parts of low hydration heat portland cement, 20-25 parts of vitrified micro bubbles, 25-30 parts of slag powder, 8-10 parts of silica fume, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate and 65-75 parts of water.
As a further preferable technical scheme, the high-strength low-hydration-heat low-density cement slurry system for well cementation also comprises 2.0 to 2.5 weight parts of fluid loss additive.
As a further preferable technical proposal, the high-strength low-hydration-heat low-density cement slurry system for well cementation also comprises 0.1 to 0.25 weight part of drag reducer.
As a further preferable technical scheme, the high-strength low-hydration-heat low-density cement slurry system for well cementation also comprises 0 to 0.4 weight part of retarder.
As a further preferable technical scheme, the low hydration heat portland cement comprises the following mineral components in percentage by mass: 28 to 33 percent of tricalcium silicate; 42 to 48 percent of dicalcium silicate; 0 to 3 percent of tricalcium aluminate; 15 to 17 percent of tetracalcium aluminoferrite; 3 to 4 percent of calcium oxide; the balance being mixed mineral components.
Specifically, the content of the hybrid mineral component is less than 5% by mass.
Specifically, the mixed mineral component is MgO or SO 3 Or a mixture thereof.
Furthermore, the particle size of the low-heat portland cement is 2.0-150 mu m, and the hydration heat of the low-heat portland cement with the heat release rate of 3d is less than 195kJ/kg.
In a more preferred embodiment, the fluid loss agent is polyvinyl alcohol 1788.
As a further preferable technical scheme, the retarder is tetra sodium hydroxyethylidene diphosphonate.
In a more preferred embodiment, the drag reducer is a polycarboxylic acid drag reducer.
The invention also provides a preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro silicon powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate, 2-3 parts of fluid loss additive and 0.1-0.25 part of drag reducer; 0-0.5 part of retarder;
s2, uniformly mixing the raw materials weighed in the S1 under the normal temperature condition to obtain mixed dry ash;
and S3, putting 65-75 parts of water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
The invention further provides application of the high-strength low-hydration-heat low-density cement slurry system for well cementation, wherein the density of the high-strength low-hydration-heat low-density cement slurry system is 1.20-1.30g/cm 3 The strength reaches more than 10Mpa in 48 hours; it is suitable for oil and gas well cementing operation at 50-90 deg.c.
By adopting the technical scheme, the invention has the advantages that:
1. the high-strength low-hydration-heat low-density cement slurry system can be used within the temperature range of 50-90 ℃, and compared with a low-density high-strength system prepared by the existing G-level portland cement, the system has the characteristics of better low-hydration-heat retardation at the early stage and higher strength at the later stage; no retarder or little retarder is used, and the interference of the retarder is reduced for quick solidification and channeling prevention of returning to the middle and upper parts of a shaft; the method solves the conflict point that the thickening time is delayed by a retarder in the early stage of low density and the solidification quality is improved by a coagulant in the later stage, and obtains fundamental improvement from materials for improving the sealing quality of a filling section.
2. The invention adopts low hydration heat portland cement to replace high sulfur-resistant G-grade cement to prepare a low-heat high-strength low-density system, has comprehensive improvement on performance compared with the original system, and overcomes the problems of poor temperature resistance of the original system, large additive consumption, difficult preparation and the like; meanwhile, the fluidity is better, and the construction replacement friction resistance is reduced; in order to better seal key wells and high-difficulty wells, the cement paste technical water is improved.
3. The high-performance low-heat portland cement developed by the invention mainly breaks through the traditional Portland Cement (PC) clinker and tricalcium silicate (C) 3 S is more than or equal to 50 percent) is the composition design of the leading mineral, and the preparation technology solves the problem of C 2 S activation and normal temperature stability, and directly preparing high-activity low-heat portland cement by adopting different rotary cement kilns at home and abroad for the first time, thereby realizing the large-scale production of the low-heat portland cement.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
It should be noted that: the examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. All starting materials mentioned in the following examples are obtained from published commercial sources unless otherwise specified.
In the present invention, the percentage (%) or parts means the mass percentage or parts by weight with respect to the composition, unless otherwise specified.
Aiming at the defects of the current low-density high-strength system, in order to improve the cementing quality of oil and gas wells, the invention adopts the following technical means:
1. selecting a low-heat portland cement of appropriate composition:
based on the requirements of domestic and foreign standards on the composition and performance indexes of the low-heat portland cement (see tables 1 and 2 respectively), the low-hydration-heat portland cement components are preferably selected by proportioning portland cement for different components and repeated experimental screening in a low-density system: c 3 The S content is 28-33%; c 2 The content of S is 42-48%; c 3 The content of A is not more than 3 percent; c 4 The AF content is 15 to 17 percent; the CaO content is 3-4%; the balance being mixed mineral components.
Specifically, the mixed mineral component is MgO or SO 3 One or a mixture thereof; and the mass percentage content of the mixed mineral components is less than 5 percent.
The selected low hydration heat portland cement component C 2 S content of more than 42%, C 3 The content of S is less than 33 percent, C 3 The content of A is not more than 3 percent, the content of silicate minerals in a clinker mineral system is 75 to 80 percent, and the particle size of the low-heat portland cement is 2.0 to 150 mu m. The invention increases the C with slow heat release rate and high condensation strength 2 The S content achieves the aims of reducing hydration heat in the early stage, prolonging thickening time and increasing strength in the later stage.
TABLE 1 Standard requirements for chemical composition and mineral composition of low-heat portland cement or clinker
| Correlation criteria | MgO | SO 3 | C 3 S | C 2 S | C 3 A |
| ASTMC150-16 | ≤6.0％ | ≤2.3％ | ≤35％ | ≥40％ | ≤7％ |
| JISR5210-2009 | ≤5.0％ | ≤3.5％ | / | ≥40％ | ≤6％ |
| GB200-2003 | ≤6.0％ | ≤3.5％ | / | ≥40％ | ≤6％ |
Table 2 the standards of various countries have requirements on the indexes of the compression strength and the hydration heat performance of the low-heat cement
TABLE 3 comparison of hydration heat of selected low heat portland cements with other cements
| Varieties of cement | 3d Heat of hydration/kJ/kg | 7d Heat of hydration/kJ/kg | 28d Heat of hydration/kJ/kg |
| Low heat portland cement | 192 | 222 | 263 |
| G-grade oil well cement | 233 | 276 | 315 |
| Ordinary portland cement | 253 | 296 | 348 |
As can be seen from Table 3, the selected low heat portland cement has a lower heat release rate (3 d heat of hydration less than 195/kJ/kg) than the grade G oil well cement (3 d heat of hydration less than 233/kJ/kg).
In addition, the 28d strength of the low hydration heat Portland cement is equivalent to that of the general Portland cement, and the 90d later-age strength of the low hydration heat Portland cement is higher than that of the traditional Portland cement by more than 10 MPa. Therefore, the low hydration heat portland cement has the characteristics of slow hydration reaction, low hydration heat, high later-stage strength, good erosion resistance and the like, and ensures that the later-stage solidification strength meets the row standard requirements.
2. On the basis of the research results, the invention uses the selected low hydration heat portland cement to prepare a high-strength low hydration heat low-density cement slurry system with balanced and reliable performance for field cementing construction, and the cement slurry system comprises the following components in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro silicon powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate and 65-75 parts of water.
When the high-strength low-hydration-heat low-density cement slurry system provided by the invention is used, additives such as a retarder, a fluid loss additive, a drag reducer and the like are selectively added in different amounts according to the difference of well temperature and well type so as to adjust the thickening time of the system curing. Wherein, the addition amount of the retarder is preferably 2.0 to 2.5 parts by weight; the amount of the drag reducer added is preferably 0.1 to 0.25 parts by weight; the addition amount of the retarder is preferably 0 to 0.4 part by weight.
It is further noted that in the construction of oil and gas wells, the low-density slurry is required to have both long thickening time and high cementing strength, so that any one or two or more than two of the retarder, the fluid loss additive and the drag reducer can be added according to actual needs to ensure the well cementation quality of the whole well. Specific embodiments are illustrated below:
as a further preferable technical scheme, the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following components in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro silicon powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate, 2.0-2.5 parts of fluid loss additive, 0.1-0.25 part of drag reducer and 65-75 parts of water.
As a further preferable technical scheme, the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following components in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro-silica powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate, 0-0.4 part of retarder and 65-75 parts of water.
As a further preferable technical scheme, the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following components in parts by weight: 25-35 parts of low hydration heat portland cement; 20-25 parts of 60-mesh closed vitrified perlite; s105, 25-30 parts of slag powder; 8-10 parts of micro silicon powder (industrial grade); 3-5 parts of calcined gypsum (industrial grade); 1-2 parts of sodium sulfate (industrial grade); 1-2 parts of quicklime (industrial grade); 2-3 parts of hydrated lime (industrial grade); 2-3 parts of sodium metasilicate (modulus 2.8-3.0); 0.5-1.5 parts of sodium carbonate (industrial grade); 2.0-2.5 parts of fluid loss agent (polyvinyl alcohol 1788); 0.1 to 0.25 portion of drag reducer (polycarboxylic acid); 0.15 to 0.4 portion of retarder (hydroxyl ethylidene diphosphonic acid tetrasodium) and 65 to 75 portions of water.
The invention depends on the activity of S105-grade slag powder to generate a strength effect equivalent to 105 parts of cement with the same mass, and forms compact particle grading with low hydration heat portland cement, lightening vitrified micro-beads and micro silicon powder in the system, thereby realizing the effect of higher strength.
In a more preferred embodiment, the fluid loss agent is polyvinyl alcohol 1788.
As a further preferable technical scheme, the retarder is tetra sodium hydroxyethylidene diphosphonate.
In a further preferred embodiment, the drag reducer is a polycarboxylic acid drag reducer.
3. On the basis of the research results, the invention further provides a preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following steps:
s1, weighing the following raw materials in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of micro silicon powder, 3-5 parts of plaster of paris, 1-2 parts of sodium sulfate, 1-2 parts of quicklime, 2-3 parts of slaked lime, 2-3 parts of sodium metasilicate, 0.5-1.5 parts of sodium carbonate, 2-3 parts of fluid loss additive and 0.1-0.25 part of drag reducer; 0-0.4 part of retarder;
s2, uniformly mixing the raw materials weighed in the S1 under the normal temperature condition to obtain mixed dry ash;
and S3, putting 65-75 parts of water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
As a further preferred technical solution there is provided,
4. on the basis of the research results, the invention further provides the application of the high-strength low-hydration-heat-low-density cement slurry system for well cementation, and the density of the high-strength low-hydration-heat-low-density cement slurry system is 1.20-1.30g/cm 3 The strength reaches more than 10Mpa in 48 hours; it is suitable for oil and gas well cementing operation at 50-90 deg.c.
The present invention will be described in further detail with reference to examples and comparative examples.
Example 1:
the embodiment provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in part by weight: 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite (vitrified micro bubbles), 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of calcined gypsum, 3.0 parts of sodium metasilicate, 0.75 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quicklime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive, 0.15 part of drag reducer and 75 parts of tap water.
The preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following steps of:
s1, uniformly mixing 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of micro silicon powder, 3.5 parts of calcined gypsum, 3.0 parts of sodium metasilicate, 0.75 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quick lime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive and 0.15 part of drag reducer under a normal temperature condition to obtain mixed dry ash;
s2, putting 75 parts of tap water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S1 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
Example 2:
the embodiment provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in part by weight: 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of calcined gypsum, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quicklime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive, 0.15 part of drag reducer and 65 parts of tap water.
The preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following steps of:
s1, uniformly mixing 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of micro silicon powder, 3.5 parts of calcined gypsum, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quick lime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive and 0.15 part of drag reducer under a normal temperature condition to obtain mixed dry ash;
s2, putting 65 parts of tap water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S1 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
Example 3:
the embodiment provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in part by weight: 25 parts of low-hydration-heat cement, 25 parts of 60-mesh closed vitrified perlite, 30 parts of S105 slag powder, 10 parts of silica fume, 3.0 parts of plaster of paris, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.5 parts of quicklime, 1.0 part of slaked lime, 2.2 parts of fluid loss additive, 0.15 part of drag reducer and 70 parts of tap water.
The preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following steps of:
s1, uniformly mixing 25 parts of low-hydration-heat cement, 25 parts of 60-mesh closed vitrified perlite, 30 parts of S105 slag powder, 10 parts of micro silicon powder, 3.0 parts of calcined gypsum, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.5 parts of quick lime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive and 0.15 part of drag reducer under a normal temperature condition to obtain mixed dry ash;
s2, 70 parts of tap water is put into a stirring slurry cup of a constant-speed stirrer, the constant-speed stirrer is started, the mixed dry ash obtained in the step S1 is uniformly poured into the rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and the stirring is continued for 35 seconds, so that the high-strength low-hydration-heat low-density cement slurry system is obtained.
The performance of the high-strength low-hydration-heat low-density cement paste systems for well cementation obtained in examples 1 to 3 and having different densities at different temperatures was tested, and the test results are shown in tables 4, 5, 6, 7 and 8 below.
TABLE 4 Experimental results of high-strength low-hydration-heat low-density cement paste system for well cementation with different densities at 50 DEG C
TABLE 5 Experimental results of high strength low hydration heat low density cement slurry system for well cementation at different densities at 60 deg.C
TABLE 6 Experimental results of high-strength low-hydration-heat low-density cement paste system for well cementation with different densities at 70 deg.C
TABLE 7 Experimental results of high-strength low-hydration-heat low-density cement paste system for well cementation with different densities at 80 deg.C
TABLE 8 Experimental results of high-strength low-hydration-heat low-density cement paste system for well cementation with different densities at 90 DEG C
The above series of experimental data show that the low-heat high-strength low-density system (i.e. the high-strength low-hydration-heat low-density cement slurry system) with different densities can be adjusted by adding a small amount of retarder, so that the system has a longer thickening time within the range of 50-90 ℃, and meanwhile, the interference on the strength development is controlled within an acceptable range, wherein the influence on the strength after two days hardly exists; the aim of saving the additive and improving the working efficiency is fulfilled.
Example 4:
the embodiment provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in part by weight: 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of calcined gypsum, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quicklime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive, 0.15 part of drag reducer and 65 parts of tap water.
The preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following steps of:
s1, uniformly mixing 25 parts of low-hydration-heat cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of plaster of paris, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quicklime, 1.0 part of slaked lime, 2.2 parts of a fluid loss additive and 0.15 part of a drag reducer under a normal temperature condition to obtain mixed dry ash;
s2, putting 65 parts of tap water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S1 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
Comparative example:
the embodiment provides a high-strength low-hydration-heat low-density cement slurry system for well cementation, which comprises the following components in part by weight: 25 parts of high-resistance G-grade cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of plaster of paris, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quicklime, 1.0 part of slaked lime, 2.2 parts of fluid loss additive, 0.15 part of drag reducer and 65 parts of tap water.
The preparation method of the high-strength low-hydration-heat low-density cement slurry system for well cementation comprises the following steps of:
s1, uniformly mixing 25 parts of high-resistance G-grade cement, 30 parts of 60-mesh closed vitrified perlite, 25 parts of S105 slag powder, 10 parts of silica fume, 3.5 parts of calcined gypsum, 2.5 parts of sodium metasilicate, 0.5 part of sodium carbonate, 1.5 parts of sodium sulfate, 1.0 part of quick lime, 1.0 part of hydrated lime, 2.2 parts of fluid loss additive and 0.15 part of drag reducer at normal temperature to obtain mixed dry ash;
s2, putting 65 parts of tap water into a stirring slurry cup of a constant-speed stirrer, starting the constant-speed stirrer, uniformly pouring the mixed dry ash obtained in the step S1 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain the high-strength low-hydration-heat low-density cement slurry system.
The rheological properties of the high-strength low-hydration-heat low-density cement slurry system and the high-resistance G-class cement system for well cementation obtained in the embodiment are tested, and the test results are shown in the following tables 9 and 10.
TABLE 9 rheology of high-strength low-hydration-heat low-density cement slurry system for well cementation (65 degree/20 min/atmospheric pressure)
| Rotational speed | 3 | 6 | 100 | 200 | 300 | 600 |
| Uplink (UL) | 11 | 14 | 43 | 65 | 87 | 133 |
| Downstream | 9 | 14 | 41 | 64 | 86 | 132 |
| Average | 11 | 14 | 42 | 64.5 | 86.5 | 132.5 |
Wherein the apparent viscosity =66.5 centipoise, the plastic viscosity =46 centipoise, n =0.5596, K =13.64.
TABLE 10 rheological Properties of high G-resistant class Cement System (65 deg./20 min/atmospheric pressure)
| Rotational speed | 3 | 6 | 100 | 200 | 300 | 600 |
| Uplink is carried out | 12 | 16 | 37 | 55 | 80 | 139 |
| Downstream | 12 | 16 | 38 | 50 | 78 | 137 |
| Average | 12 | 16 | 37.5 | 49.5 | 79 | 138 |
Wherein the apparent viscosity =69 centipoise, the plastic viscosity =59 centipoise, n =0.4917, K =18.44.
In comparison with the above two sets of data, it is evident that: the low-density high-strength system obtains higher system strength, adopts lower water-cement ratio (the ratio of water to total dry ash is 0.65-0.75), has high solid content in unit volume, causes the initial consistency of slurry to be generally higher (more than 20 Bc), and under the same condition, the high-strength low-hydration-heat low-density cement slurry system for well cementation has low early hydration degree, the fluidity and the fluidity index are obviously better than those of a high-anti-G-grade cement system, the fluidity is good, the viscosity is low, the flow resistance is favorably reduced, and the fluidity index is stable, so that the viscosity of the system rises along with the rise of temperature and is closer to the linear state, but does not rise exponentially and accelerate.
The series of experimental data show that: compared with a low-density system formed by G-level high-resistance cement, the high-strength low-hydration-heat low-density cement slurry system for well cementation has the advantages that the comprehensive performance is improved, and the problems of poor temperature resistance of a protogen system, large additive consumption, difficult preparation and the like are solved; meanwhile, the fluidity is better, and the construction replacement friction resistance is reduced; the technical level of cement paste is improved for better sealing key wells and high-difficulty wells.
In conclusion, the performance of the high-strength low-hydration-heat low-density cement slurry system for well cementation can reach the following indexes:
(1) The application range is as follows:
(1) system density: 1.20-1.30g/cm 3
(2) The applicable temperature is as follows: 50-90 DEG C
(3) The strength requirement of the set cement is as follows: the normal pressure/45 ℃/24h/48h is more than 7MPa/10MPa (according with the performance requirement of SY/T6544-2017 oil well cement slurry).
The high-strength low-hydration-heat low-density cement slurry system for well cementation solves the following defects:
(1) poor temperature resistance: the thickening time of the original system is obviously shortened (shortened by more than 60-100 min) at the temperature of more than 70 ℃;
(2) the additive dosage is large: at the same temperature, density and thickening time, the added retarder and intensifier of the original system exceed the new system by more than 50 percent;
(3) the problems of difficult blending and the like: because the addition amount of the retarder for adjusting the thickening time is large, the strength development of the system is influenced for 24-48h, and the proportioning relationship between the retardation and the enhancement needs to be adjusted for many times.
(2) And (3) performance improvement:
(1) better fluidity: because the early hydration degree of the selected material is low, the early viscosity of the system is reduced, the good fluidity is maintained, and the construction displacement friction resistance is reduced.
(2) Better middle and later strength: due to C 2 S has a ratio of C 3 And the higher coagulation strength of S and the low consumption of the retarder enable the system to have higher coagulation strength (improved by more than 15 parts).
(3) Under the condition of the same proportion, the formed basic physical index data of the cement paste system, such as density, consistency, stability and the like, are not obviously changed (the fluctuation of each data is less than 3 parts), and the subsequent formulation fine adjustment work is conveniently carried out.
(4) Under the same thickening experimental conditions, the thickening time of the high-strength low-hydration-heat low-density cement slurry system is obviously prolonged (by more than 40-80min under different temperature conditions);
(5) under the same strength curing experimental conditions, the later strength development of the high-strength low-hydration-heat low-density cement slurry system is obviously increased (by more than 1-3MPa under the different temperature conditions of 48-72 h).
Accordingly, the invention is saidThe high-strength low-hydration-heat low-density cement slurry system for the well solves the defects of the existing 'G-grade oil well cement high-strength low-density system for well cementation', is particularly suitable for well cementation of key wells and complex wells in Changqing areas (the well is generally large in construction ash amount and long in construction time, and low-density slurry is required to have both long thickening time and high cementing strength), and has the density application range as follows: 1.20-1.30g/cm 3 The strength property is as follows: the cement paste system has low density more than 7/10MPa (normal pressure 45 ℃/24h/48 h), and ensures that the shaft annulus is completely sealed once upwards; the strength is high, and the sleeve can be better supported; the temperature application range (50-90 ℃) is wide, the performance conflict between a retarder and a set accelerating activator used in the existing cement slurry system is eliminated, and the high-strength low-hydration-heat low-density cement slurry system for well cementation not only realizes the adjustability of the thickening time under the condition that the strength performance index is not influenced; and moreover, a reliable technical guarantee is provided for preventing loss, improving the sealing rate, stabilizing the productive layer section, ensuring the whole well cementing quality and the key well cementing.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (6)
1. A high-strength low-hydration-heat low-density cement slurry system for well cementation is characterized by comprising the following components in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of silica fume, 3425 parts of plaster of paris, 3425 parts of zxft, 3562 parts of sodium sulfate, 4324 parts of quick lime, 3245 parts of slaked lime, 3232 parts of sodium metasilicate, 3732 parts of sodium carbonate, 0.5-1.5 parts of sodium carbonate, 0-0.4 part of retarder and 65-75 parts of water;
the low hydration heat portland cement comprises the following mineral components in percentage by mass: 28% -33% of tricalcium silicate; 42% -48% of dicalcium silicate; tricalcium aluminate 0~3%; 15% -17% of tetracalcium aluminoferrite; calcium oxide 3~4%; the balance being mixed mineral components;
the mass percentage content of the mixed mineral component is less than 5 percent;
the mixed mineral component is MgO or SO 3 One or a mixture thereof;
the particle size of the low hydration heat portland cement is 2.0-150 mu m, and the hydration heat with the heat release rate of 3d is less than 195kJ/kg;
the density of the high-strength low-hydration-heat low-density cement slurry system for well cementation is 1.20 to 1.30g/cm 3 。
2. The high-strength low-hydration-heat low-density cement slurry system for well cementation according to claim 1, characterized in that the high-strength low-hydration-heat low-density cement slurry system for well cementation further comprises 2.0 to 2.5 parts by weight of a fluid loss agent.
3. The high-strength low-hydration-heat low-density cement slurry system for well cementation according to claim 2, characterized in that the high-strength low-hydration-heat low-density cement slurry system for well cementation further comprises 0.1 to 0.25 parts by weight of a drag reducer.
4. A high strength low hydration heat low density cement slurry system for well cementing according to claim 3, wherein: the fluid loss agent is polyvinyl alcohol 1788; the drag reducer is polycarboxylic acid; the retarder is tetra sodium hydroxyethylidene diphosphonate.
5. A preparation method of a high-strength low-hydration-heat low-density cement slurry system for well cementation is characterized by comprising the following steps:
s1, weighing the following raw materials in parts by weight: 25-35 parts of low-hydration-heat portland cement, 20-25 parts of vitrified micro-beads, 25-30 parts of slag powder, 8-10 parts of silica fume, 3245 parts of plaster of paris, 3245 parts of zxft, 3732 parts of sodium sulfate, 3732 parts of zxft, 3963 parts of quicklime, 3925 parts of slaked lime, 3536 parts of sodium metasilicate, 3536 parts of sodium carbonate, 0.5-1.5 parts of water loss reducer, 3926 parts of zxft 3926 parts of drag reducer and 0.1-0.25 part of drag reducer; 0 to 0.5 part of retarder;
s2, uniformly mixing the raw materials weighed in the S1 under the normal temperature condition to obtain mixed dry ash;
s3, pouring 65-75 parts of water into a stirring slurry cup of a constant speed stirrer, starting the constant speed stirrer, uniformly pouring the mixed dry ash obtained in the step S2 into a rotating slurry cup within 0-15 seconds at the rotating speed of 4000 rpm, and continuously stirring for 35 seconds to obtain a high-strength low-hydration-heat low-density cement slurry system;
the low hydration heat portland cement comprises the following mineral components in percentage by mass: 28% -33% of tricalcium silicate; 42% -48% of dicalcium silicate; tricalcium aluminate 0~3%; 15% -17% of tetracalcium aluminoferrite; calcium oxide 3~4%; the balance being mixed mineral components;
the mass percentage content of the mixed mineral component is less than 5 percent;
the mixed mineral component is MgO or SO 3 One or a mixture thereof;
the particle size of the low hydration heat portland cement is 2.0-150 mu m, and the hydration heat with the heat release rate of 3d is less than 195kJ/kg;
the density of the high-strength low-hydration-heat low-density cement slurry system for well cementation is 1.20 to 1.30g/cm 3 。
6. Use of a high strength low hydration heat low density cement slurry system for well cementation according to any of claims 1 to 4 wherein the high strength low hydration heat low density cement slurry system has a 48 hour strength of above 10 Mpa; it is suitable for oil and gas well cementing operation in the temperature range of 50-90 ℃.
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