CN111849440B - Low-thixotropic low-density oil well cement slurry for oil and gas well cementing treatment - Google Patents
Low-thixotropic low-density oil well cement slurry for oil and gas well cementing treatment Download PDFInfo
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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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
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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 discloses a low-thixotropic low-density high-strength oil well cement slurry system for oil and gas well cementing treatment, which comprises the following components in part by weight: 26 to 50 percent of oil well cement, 45 to 70 percent of composite lightening material, 2 to 4 percent of early strength agent, 0.20 to 0.25 percent of retarder, 0.5 to 2 percent of fluid loss additive, 0.1 to 0.2 percent of stabilizer, 0.75 to 0.90 percent of water-cement ratio, and completely removing bubbles when the defoamer is used for preparing slurry. The invention also relates to a preparation method of the composite lightening material, which comprises the following steps: the composite lightening material is mainly prepared by taking a non-microbead material with low cost as a main lightening material, reducing the using amount of hollow microbeads as much as possible, reasonably matching an active admixture and optimally designing the composite lightening material which is beneficial to improving the slurry stability and the set cement strength according to the close packing principle.
Description
Technical Field
The invention relates to the field of building material preparation, in particular to an experimental design of material preparation and mixing proportion of a composite lightening material.
Background
In recent years, low oil price becomes a new normal state, a low-cost strategy for oil-gas exploration and development becomes urgent, a high-performance low-density cement slurry system taking floating bead artificial microspheres as lightening materials has excellent performance and meets the well cementation operation of a low-pressure easily-leaking layer and a long sealing section of a low-pressure oil-gas layer, however, the floating bead and the artificial microspheres are expensive, the cost of the cement slurry is high, the application in well cementation is greatly limited, the common low-density cement slurry is widely prepared by using traditional lightening materials such as fly ash and bentonite at home and abroad, the cost is greatly reduced, most of the low-density cement slurry has the defects of poor slurry stability, large water loss, low strength of a cement stone, slow development and the like, the strength of the low-density cement stone is generally not more than 10MPa, the strength is difficult to reach 14MPa, the performance standard requirement of a technical casing on the performance of the well cementation cement stone can not be met, and the research performance of the low-density cement slurry which is obviously higher than the common low density and has little difference with the floating bead low density is of the practical significance in order to meet the technical requirement of non-purpose layer well cementation.
Therefore, the technicians in the field are dedicated to develop a non-microbead siliceous type lightening material with low cost and excellent physical and chemical properties, and the low-cost low-density cement slurry which meets the requirements of casing cementing in the common low-pressure leakage stratum technology is optimally designed in performance by utilizing the close packing technology.
Disclosure of Invention
The general idea of the invention is to take a non-microbead material as a main lightening material, reduce the dosage of hollow microbeads as much as possible, reasonably match an active admixture, optimally design a composite lightening reinforcing material which is favorable for improving the slurry stability and the cement stone strength from two aspects of filling reinforcing effect and crystallization mineralogy reinforcing effect according to the close packing principle, and design the cement slurry density which is designed on the basis of the composite lightening reinforcing material to have the advantages of adjustable thickening time, high compressive strength, low water loss, good rheological property, slurry stability and the like, and the low-density cement slurry system can meet the requirements of 1.25-1.50cm 2 The density range of the cement is/g, the cost is low, and the cement has certain market competitiveness.
In order to achieve the above object, the present invention provides a low thixotropic low density oil well cement slurry for oil and gas well cementing treatment, the slurry comprising the following components in parts by weight:
26 to 45 percent of oil well cement, 45 to 70 percent of composite lightening material, 2 to 4 percent of early strength admixture, 0.5 to 2 percent of fluid loss additive, 0.20 to 0.25 percent of retarder, 0.1 to 0.2 percent of stabilizer and 0.80 to 0.90 percent of water-cement ratio.
The invention also provides a preparation method of the composite lightening material, which comprises the following steps:
s100, grinding the porous siliceous material for the first time, pressing the porous siliceous material into a cake, sintering, quenching and then grinding for the second time to obtain a lightening material;
s200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to obtain the composite lightening material.
The selected lightening material is a low-cost natural siliceous material, and the siliceous porous material is prepared by secondary processing treatments such as high-temperature roasting, grinding, sieving and the like, and the material serving as the main lightening material has the advantages of lower density, large specific surface area, high porosity, good adsorbability, good chemical stability, no excessive thickening and the like compared with other siliceous materials such as fly ash, bentonite, expanded perlite and the like, does not have adverse effect on the performance of cement paste, and can absorb water and retain water according to the high water absorption and high water retention of the material.
The composite lightening material is optimally designed according to the close packing principle by taking the non-micro-bead material with low cost as a main lightening material, reducing the using amount of the hollow micro-beads as much as possible, reasonably matching the active admixture and optimally designing the composite lightening material which is beneficial to improving the slurry stability and the set cement strength.
The conception, the specific structure, and the technical effects produced by the present invention will be further described below to fully understand the objects, the features, and the effects of the present invention.
Detailed Description
The invention provides low-thixotropic low-density oil well cement slurry for oil and gas well cementing treatment, which comprises the following components in percentage by weight:
26 to 45 percent of oil well cement, 45 to 70 percent of composite lightening material, 2 to 4 percent of early strength admixture, 0.5 to 2 percent of fluid loss additive, 0.20 to 0.25 percent of retarder, 0.1 to 0.2 percent of stabilizer and 0.80 to 0.90 percent of water-cement ratio.
The selection of the proportion range of each component in the cement paste is selected and designed for the comprehensive performance consideration of the low-thixotropic low-density oil well cement paste for oil and gas well cementing treatment, and the low-thixotropic low-density oil well cement paste can be obtained through limited experiments.
In a preferred embodiment, the cement is Yaowangshan grade G oil well cement.
In a preferred embodiment, the early strength agent is a mixture of triethanolamine and compound sodium nitrophenolate, the retarder is a mixture of polyol phosphate with the total phosphorus content of more than 30% and sucrose, the stabilizer is a mixture of magnesium aluminum silicate and glycol alginate, and the fluid loss agent is one or more of methyl cellulose, carboxymethyl cellulose, ethyl cellulose and hydroxyethyl cellulose.
In a preferred embodiment, the composite lightening material is a mixture of lightening material and micro-silicon and ultra-fine cementing material, and the lightening material is siliceous porous material.
In a preferred embodiment, the surface area of the micro-silicon is 14000 to 19000m 2 Per kg, and the activity index is 110-119%.
The invention also provides a preparation method of the composite lightening material, which comprises the following steps:
s100, grinding the porous siliceous material for the first time, pressing the porous siliceous material into a cake, sintering, quenching and then grinding for the second time to obtain a lightening material;
s200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to obtain the composite lightening material.
In a preferred embodiment, the first grinding in step S100 is performed until the specific surface area of the porous silicon material is 300-400Kg/m 2 The sintering temperature is 1400-1500 ℃, and the sintering is carried outThe bonding time is 3-4 hours, the secondary grinding is carried out until the specific surface area is 14500-15000Kg/m 2 The rapid cooling is realized in an air cooling mode, wherein the specific surface area is related to the fineness of cement, and the thinner the cement mill is, the larger the specific surface area is, and the smaller the specific surface area is vice versa; compared with the selection range of the specific surface area of the cement used in the invention, if the selection range is too thin, the early hydration is sufficient, the early strength is high, the water demand is high, the probability of concrete cracking is high, and otherwise, the early strength is low, and the water demand is low. The control of the specific surface area of the used cement is favorable for controlling the water consumption and the early strength of the concrete, which is also a reference reason for the low water consumption in the concrete production;
according to the invention, the sintering temperature is obtained by combining experiments with theory, when the sintering temperature is too low, the sintering is insufficient, the point defect concentration is increased, the lattice constant is increased, and the performance of the finally obtained lightening material is reduced; when the sintering temperature is too high, the grain boundary moving speed is increased, so that the growth rate of some grains is obviously higher than that of other grains, an overburning phenomenon occurs in a sample, the interaction between the grains and the grain boundary is abnormal, and the performance of the finally obtained lightening material is reduced.
In a preferred embodiment, the porous siliceous material is sandstone with good grindability, and the silicon content is more than 90%.
In a preferred embodiment, the ultra-fine cementitious material is ultra-fine oil well cement.
In a preferred embodiment, the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75-0.8, and the W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash ＝65-70∶10-15∶20-25。
The material is a preferred low-cost natural siliceous material, and is prepared through secondary processing treatments such as high-temperature roasting, grinding, sieving and the like. The performance of several non-microbead-based mitigation materials were compared and determined as shown in table 1:
TABLE 1 several lightening Material basic Properties
| Lightening material | Density (g/cm) 3 ) | Specific surface area (m) 2 /g) | Pore volume (cm) 3 /g) | Water absorption% |
| Siliceous material | 2.0 | 55.1 | 0.78 | 350 |
| Ordinary fly ash | 2.6 | 1.8 | 0.16 | 75 |
| Natural bentonite | 2.7 | 21.6 | 0.30 | 245 |
| Expanded perlite | 2.7 | 17.3 | 0.45 | 219 |
| Natural zeolite | 2.6 | 13.5 | 0.23 | 155 |
As seen from the above table, the siliceous material has the lowest density, but the largest specific surface area, the largest pore volume and the largest water absorption, as compared to conventional fly ash, natural bentonite, expanded perlite and natural zeolite. Comprehensively, the method is most suitable for preparing low-density cement paste.
The following further describes embodiments of the present invention with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the scope of the present invention is not limited by the examples of the present invention.
Example 1
The low-thixotropic low-density oil well cement slurry for oil and gas well cementing treatment is provided, and comprises the following raw materials in percentage by weight:
45% of G-grade oil well cement, 48.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of methyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester, and 0.85% of water-cement ratio.
In this embodiment, the G-grade oil well cement is produced by YB corporation.
In this example, the composite mitigation material was prepared as follows:
s100, grinding the porous siliceous material for the first time, pressing a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material reaches 300Kg/m 2 Pressing, sintering at 1400 deg.C for 4 hr, air cooling, quenching, grinding to obtain 14500-15000Kg/m specific surface area 2 ，；
S200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to prepare the composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash =65:15:20, the superfine cementing material in this example is superfine oil well cement.
Example 2
The low-thixotropic low-density oil well cement slurry system for oil and gas well cementing treatment is provided, and comprises the following raw materials in percentage by weight:
40% of G-grade oil well cement, 53.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of hydroxymethyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester and 0.85% of water cement ratio.
In this embodiment, the G-grade oil well cement is produced by YB corporation.
In this example, the composite mitigation material was prepared as follows:
s100, grinding the porous siliceous material for the first time, pressing a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material is 300Kg/m 2 Pressing into cake, sintering at 1400 deg.C for 4 hr, taking out, air cooling, quenching, grinding to specific surface area of 14500-15000Kg/m 2 ，；
S200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to prepare the composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash = 66: 12: 21, the superfine cementing material in this example is superfine oil well cement.
Example 3
The low thixotropic low-density oil well cement slurry system for oil and gas well cementing treatment comprises the following raw materials in percentage by weight:
35% of G-grade oil well cement, 58.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of mixture of methyl cellulose and hydroxyethyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester and 0.85% of water-cement ratio.
In this embodiment, the G-grade oil well cement is produced by YB corporation.
In this example, the composite mitigation material was prepared as follows:
s100, grinding the porous siliceous material for the first time, pressing a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material is 300Kg/m 2 Pressing into cake, sintering at 1400 deg.C for 4 hr, taking out, air cooling, quenching, grinding to specific surface area of 14500-15000Kg/m 2 ，；
S200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to prepare the composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash = 67: 13: 20, the superfine cementing material in this example is superfine oil well cement.
Example 4
The low-thixotropic low-density oil well cement slurry system for oil and gas well cementing treatment is provided, and comprises the following raw materials in percentage by weight:
30% of G-grade oil well cement, 63.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of hydroxyethyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester, and 0.85% of water-cement ratio.
In this embodiment, the G-grade oil well cement is produced by YB corporation.
In this example, the composite mitigation material was prepared as follows:
s100, grinding the porous siliceous material for the first time, pressing the porous siliceous material into a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material is 300Kg/m 2 Pressing into cake, sintering at 1400 deg.C for 4 hr, taking out, air cooling, quenching, grinding to specific surface area of 14500-15000Kg/m 2 ，；
S200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to prepare the composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash = 68: 10: 22, the superfine cementing material in this example is superfine oil well cement.
Example 5
The low-thixotropic low-density oil well cement slurry system for oil and gas well cementing treatment is provided, and comprises the following raw materials in percentage by weight:
26% of G-grade oil well cement, 67.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of mixture of ethyl cellulose and hydroxyethyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester and 0.85% of water-cement ratio.
In this embodiment, the grade G oil well cement is produced by YB corporation.
In this example, the composite mitigation material was prepared as follows:
s100, grinding the porous siliceous material for the first time, pressing a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material is 300Kg/m 2 Pressing into cake, sintering at 1400 deg.C for 4 hr, taking out, air cooling, quenching, grinding to specific surface area of 14500-15000Kg/m 2 ，；
S200, mixing and stirring the lightening material, micro-silicon and the superfine cementing material to prepare the composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material ∶W Micro silicon ∶W Ultra-fine ash = 70: 10: 20, the superfine cementing material in this example is superfine oil well cement.
The cement paste systems of examples 1 to 5 were tested for performance in accordance with the national standard GB/T10238-2015.
Table 2 results of testing the properties of the slurries prepared in examples 1-5
From the results of performance tests on the low-thixotropic low-density oil well cement slurries for oil and gas well cementing treatment prepared in examples 1 to 5 in table 2 above, it can be seen that a low-thixotropic low-density high-strength oil well cement slurry system with a density of 1.25 to 1.50 can be prepared under different water-cement ratios by using the composite lightening reinforcing material, and performance evaluation results show that the cement slurry system has stable slurry, low water loss, good rheological property and thickening property, sufficient cement stone strength, and little difference between the overall performance and the floating bead low-density cement slurry, and meets the requirements of non-target layer cementing construction.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and modifications made according to the technical solutions described in the embodiments, and equivalents, improvements, etc. made to some technical features thereof should be included in the scope of the present invention.
Claims (1)
1. A low thixotropic low density oil well cement slurry for use in oil and gas well cementing processes, the slurry comprising the following components in parts by weight:
45% of G-grade oil well cement, 48.8% of composite lightening material, 4% of mixture of triethanolamine and compound sodium nitrophenolate, 2% of methyl cellulose, 0.2% of mixture of magnesium aluminum silicate and alginic acid glycol ester, and 0.85% of water-cement ratio;
the composite lightening material is prepared according to the following method:
s100, grinding the porous siliceous material for the first time, pressing the porous siliceous material into a cake, sintering, quenching and then grinding for the second time to obtain the lightening material:
the porous siliceous material is quartz sand, and is ground for one time until the specific surface area of the porous siliceous material reaches 300m 2 /kg, pressing, sintering at 1400 deg.C for 4 hr, air cooling, quenching, and grinding to obtain specific surface area of 14500-15000m 2 /kg，；
S200, mixing and stirring the lightening material, micro-silicon and a superfine cementing material to prepare a composite lightening material:
the maximum bulk density of the ternary system of the lightening material, the micro-silicon and the superfine cementing material is 0.75, and W is calculated according to the mass fraction ratio Lightening material :W Micro silicon :W Ultra-fine ash 20, wherein the superfine cementing material is superfine oil well cement;
wherein, the first and the second end of the pipe are connected with each other,
the low thixotropic low-density oil well cement paste is subjected to performance detection according to the national standard GB/T10238-2015, and the performance indexes are as follows:
the density was 1.50g/cm 3 ，
The water loss at 50 ℃ and 6.9MPa is 72,
the fluidity was 23cm and the fluidity was,
the percentage of the free liquid is 0.2,
the sedimentation stability was 0.023g/cm 3 ，
The thickening time is 265min, and the thickening time is 265min,
the strength was 12.1 at 45 ℃ for 24 hours.
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