CN115872680A - Light toughened well cementing material and preparation method thereof - Google Patents
Light toughened well cementing material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 75
- 239000000843 powder Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 239000003129 oil well Substances 0.000 claims abstract description 24
- 229920001971 elastomer Polymers 0.000 claims abstract description 20
- 239000011324 bead Substances 0.000 claims abstract description 17
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 10
- 239000003381 stabilizer Substances 0.000 claims abstract description 10
- 239000002245 particle Substances 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000010920 waste tyre Substances 0.000 claims description 8
- 229920003043 Cellulose fiber Polymers 0.000 claims description 7
- 229920000459 Nitrile rubber Polymers 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- 239000001110 calcium chloride Substances 0.000 claims description 6
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 102200120772 rs876661123 Human genes 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 235000013311 vegetables Nutrition 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 7
- 230000035939 shock Effects 0.000 abstract 1
- 241000196324 Embryophyta Species 0.000 description 21
- 239000002002 slurry Substances 0.000 description 13
- 239000004575 stone Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000008104 plant cellulose Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a light toughening well cementing material and a preparation method thereof, belonging to the technical field of well cementing materials. The light toughened well cementing material provided by the invention comprises the following components in parts by mass: 30-40 parts of G-grade oil well cement, 20-35 parts of vacuum glass beads, 8-15 parts of silica fume, 4-8 parts of plant fiber, 2-5 parts of rubber powder, 2.5-5 parts of early strength agent, 3-5 parts of fluid loss agent, 0.1-0.4 part of retarder and 0.1-0.3 part of stabilizer. The water cement ratio of the light toughening well cementing material is 0.6-0.8. The lightweight toughened well cementing material prepared by the invention improves the initial setting strength development speed of the set cement, enables the early strength to reach more than 7.0MPa (45 ℃/48 h), improves the toughness and the shock resistance of the set cement, and has small elastic modulus of the set cement which is only 4.5-5.5 GPa.
Description
Technical Field
The invention relates to the technical field of well cementation materials, in particular to a light toughened well cementation material and a preparation method thereof.
Background
With the continuous development of petroleum exploration and development technology, the formation pressure gradient of an oil reservoir is continuously reduced, and the conventional low-density well cementing material cannot meet the requirement, so that the challenge is provided for the lower-density well cementing material, and a wide development space is provided for the development and application of the ultra-low-density well cementing material.
In the current market, for the preparation of ultra-low density well cementing materials, G-grade oil well cement is often used as a base material, and a proper amount of expensive lightening materials (such as hollow glass beads and floating beads), chemical additives and a proper amount of external admixtures are added for composite preparation, but the following problems exist: the mechanical property of the cement stone is poor, and particularly the toughness is low; (2) the sedimentation stability of the slurry is poor; (3) The adopted lightening materials (such as hollow glass beads and floating beads) are expensive, resources are deficient, and the effect of reducing the density is not obvious.
Therefore, aiming at the defects, how to obtain a light toughening well cementing material with low density and good mechanical property and a preparation method thereof are technical problems to be solved at present.
Disclosure of Invention
The invention aims to provide a light toughened well cementing material and a preparation method thereof, and aims to solve the technical problems of high density, poor mechanical property and poor slurry sedimentation stability of the conventional well cementing material.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a light toughening well cementing material which comprises the following components in parts by mass:
the water cement ratio of the light toughening well cementing material is 0.6-0.8.
Further, the grade G oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m.
Further, the compressive strength of the hollow glass microspheres is more than or equal to 6000psi; siO in the silica fume 2 More than or equal to 90 percent, and the particle size distribution is 0.01 to 0.6 mu m.
Furthermore, the plant fiber is cellulose fiber, the average length is 2-3 mm, and the diameter is 10-20 μm.
Further, the rubber powder comprises waste tire rubber powder and/or nitrile rubber powder, the particle size of the rubber powder is 20-120 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
Further, the early strength agent comprises one or more of sodium sulfate, calcium chloride and calcium sulfate; the fluid loss agent comprises one or more of G301A, G302 and G33S; the retarder is GH-I and/or JH-10; the stabilizer comprises one or more of SD85, SD89 and HT-30.
The invention provides a preparation method of a light toughening well cementing material, which comprises the following steps:
1) Premixing water with water consumption of 50% and plant fibers to obtain a mixture;
2) And mixing the rest components, the rest water and the mixture to obtain the light toughened well cementing material.
Further, in the step 1), the pre-mixing rotating speed is 10000-14000 r/min, and the pre-mixing time is 3-10 min.
Further, in the step 2), the mixing speed is 3800-4200 r/min, and the mixing time is 40-60 s.
The invention has the beneficial effects that:
the light toughened well cementing material has the following advantages: (1) The initial setting strength development speed of the set cement is improved, and the early strength of the set cement can reach more than 7.0MPa (45 ℃/48 h); (2) The cement stone has good toughness and impact resistance, and the cement stone has small elastic modulus which is only 4.5-5.5 GPa; (3) The cement paste has good rheological property, good paste stability, no free liquid and small water loss; (4) Under the condition of lower water-cement ratio (0.6-0.8), the configurable density is 1.10g/cm 3 Ultra low density cement slurry systems.
Compared with the conventional low-density well cementing material, the light toughening well cementing material of the invention has the following advantages: and (1) the ingredients are different. The conventional low-density well cementing material usually takes perlite and floating beads as lightening materials, has high cost, is easy to crack under high pressure, and easily causes the phenomena of slurry density increase and slurry performance instability; according to the invention, based on the purposes of carbon reduction, pollution reduction, green expansion and growth, plant fibers and waste tire rubber powder are used as light toughening materials, and after the light toughening materials are dissolved in cement paste, the cement paste can be denser by fiber bridging, crack deflection and increase of pulling-out work consumed during fiber fracture, so that the cement paste is endowed with higher impact resistance and breaking strength. (2) lower water-cement ratio. The conventional water cement ratio is usually controlled to be 0.8-1.1, but the invention prepares the light toughening well cementing material under the condition of lower water cement ratio (0.6-0.8), so that the slurry density can be as low as 1.10g/cm 3 . And (3) increasing the toughness of the set cement. The elastic modulus is 2-3 GPa lower than that of the conventional set cement. And (4) the preparation methods are different. The conventional low-density well cementing material is prepared by compounding raw materials; the invention adopts the steps of mechanically dispersing the plant fiber in advance, then adding the other component raw materials, and stirring at a low speed (4000 r/min +/-200 r/min) in the whole process to obtain the light toughening well cementing material with uniform dispersion and good stability.
According to the light toughening well cementing material and the preparation method thereof, the density is effectively reduced, the water loss of cement paste can be reduced, the cement paste thickening time is shortened, and the breaking strength and the impact strength of set cement are improved; meanwhile, the doping of the lightweight toughening material also effectively reduces the elastic modulus of the set cement and improves the elastic deformation capability of the set cement. The prepared cement slurry has good sedimentation stability and stable performance at high temperature and high pressure, and has on-site guiding significance for low-pressure easily-leaked stratum and long-sealing-section well cementation.
Detailed Description
The invention provides a light toughening well cementing material which comprises the following components in parts by mass:
the water cement ratio of the light toughening well cementing material is 0.6-0.8.
In the invention, the content of the G-grade oil well cement is 30 to 40 parts by mass, preferably 32 to 38 parts by mass, and more preferably 35 parts by mass. The G-grade oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The grain size distribution is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m; preferably, the specific surface area of the Yawangshan oil well cement is 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.80 mu m, D50 is less than or equal to 14.3 mu m, and D90 is less than or equal to 40.5 mu m.
In the invention, the content of the vacuum glass beads is 20 to 35 parts, preferably 25 to 30 parts, and more preferably 28 parts by mass; the compressive strength of the hollow glass bead is more than or equal to 6000psi, preferably more than or equal to 6200psi, and further preferably more than or equal to 6500psi.
In the invention, the content of the silica fume is 8 to 15 parts, preferably 9 to 12 parts, and more preferably 10 parts by mass; siO in the silica fume 2 90% or more, preferably 92% or more, and more preferably 95% or more; the silica fume has a particle size distribution of 0.01 to 0.6. Mu.m, preferably 0.02 to 0.5. Mu.m, and more preferably 0.1 to 0.4. Mu.m.
In the present invention, the content of the plant fiber is 4 to 8 parts, preferably 5 to 7 parts, and more preferably 6 parts by mass; the plant fiber is cellulose fiber, has an average length of 2 to 3mm, preferably 2.5mm, and a diameter of 10 to 20 μm, preferably 12 to 18 μm, and more preferably 15 μm.
In the invention, the content of the rubber powder is 2 to 5 parts, preferably 3 to 4 parts, and more preferably 3.5 parts by mass; the rubber powder comprises waste tire rubber powder and/or nitrile rubber powder.
In the present invention, the particle size of the rubber powder is 20 to 120 mesh, preferably 50 to 100 mesh, and more preferably 80 mesh; the specific surface area is more than or equal to 400m 2 /kg, preferably ≥ 450m 2 /kg。
In the invention, the plant fiber and the rubber powder are adopted as the light toughening material to prepare the low-density well cementing material, which has the characteristics of no conventional low-density well cementing material, such as green environmental protection, strong toughness, low manufacturing cost and the like, reasonably utilizes the waste, and reduces the social problem caused by part of unreasonable utilization resources. The plant cellulose has better hydrophilicity, and obviously improves the mechanical property of the cement-based well cementing material, so that the well cementing material has better performance.
In the invention, the Yaowangshan G-grade (HSR) oil well cement is used as a cementing material, the plant fiber, the vacuum glass bead and the rubber powder are used as light toughening materials, the micro-silicon is used as a filling material, and the micro-silicon is compatible with an additive, so that the uniform dispersion is prepared, and the density can reach 1.10G/cm 3 The well cementing material. The invention can effectively reduce the density of the slurry and enhance the stability of the slurry under the condition of lower water cement ratio, and simultaneously, the doping of the plant fiber and the rubber powder also effectively reduces the elastic modulus of the set cement and improves the elastic deformation capability of the set cement. The prepared cement slurry has good sedimentation stability and stable performance under high temperature and high pressure, has field guiding significance for low-pressure easily-leaked stratum and long-sealing-section well cementation, and also meets the market development requirement.
In the invention, the content of the early strength agent is 2.5 to 5 parts by mass, preferably 3 to 4 parts by mass, and more preferably 3.5 parts by mass; the early strength agent comprises one or more of sodium sulfate, calcium chloride and calcium sulfate, and preferably sodium sulfate.
In the invention, the content of the fluid loss agent is 3 to 5 parts by mass, preferably 3.5 to 4.5 parts by mass, and more preferably 4 parts by mass; the fluid loss agent comprises one or more of G301A, G302 and G33S, and preferably G301A and/or G302.
In the invention, the content of the retarder is 0.1-0.4 part, preferably 0.2-0.3 part, and more preferably 0.25 part by mass; the retarder is GH-I and/or JH-10, preferably GH-I.
In the present invention, the content of the stabilizer is 0.1 to 0.3 part, preferably 0.15 to 0.25 part, and more preferably 0.2 part, in terms of parts by mass; the stabilizer comprises one or more of SD85, SD89 and HT-30, preferably SD85 and/or SD89.
The invention provides a preparation method of a light toughening well cementing material, which comprises the following steps:
1) Premixing water with water consumption of 50% and plant fibers to obtain a mixture;
2) And mixing the rest components, the rest water and the mixture to obtain the light toughened well cementing material.
In the invention, in the step 1), the pre-mixing rotation speed is 10000-14000 r/min, preferably 11000-13000 r/min, and more preferably 12000r/min; the time for premixing is 3 to 10min, preferably 5 to 8min, and more preferably 6 to 7min.
In the invention, in the step 2), the mixing speed is 3800-4200 r/min, preferably 3900-4100 r/min, and more preferably 4000r/min; the mixing time is 40 to 60 seconds, preferably 45 to 55 seconds, and more preferably 50 seconds.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
A light-weight toughened well cementing material is prepared from the following componentsThe raw materials are prepared to obtain: the components are calculated according to the mass percentage: 40 parts of G-grade oil well cement, 24 parts of vacuum glass beads and silica fume (containing 95% of SiO) 2 ) 13 parts of plant fiber, 5 parts of waste tire rubber powder, 5 parts of calcium chloride, 4.6 parts of fluid loss additive G301A4, 0.2 part of retarder GH-I, 850.2 parts of stabilizer SD, and the water-cement ratio is 0.60.
Wherein the G-grade oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m; the plant fiber is cellulose fiber with average length of 2.5mm and diameter of 10 μm; the particle size of the waste tire rubber powder is 100 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
The preparation method comprises the following steps:
1) Premixing water with water consumption of 50% and plant fiber at a rotation speed of 12000r/min for 10min to obtain a mixture;
2) And mixing the rest components, the rest water and the mixture for 50s at the rotating speed of 3800r/min to obtain the light toughening well cementing material.
Example 2
A light toughening well cementing material is prepared from the following raw materials: the components are calculated according to the mass percentage: 37 parts of G-grade oil well cement, 32 parts of vacuum glass beads and silica fume (containing 92 percent of SiO) 2 ) 10 parts of plant fiber, 7 parts of nitrile rubber powder, 4.6 parts of sodium sulfate, 5 parts of fluid loss agent G301A, 0.2 part of retarder GH-I, 850.2 parts of stabilizer SD, and the water-cement ratio is 0.70.
Wherein the G-grade oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The grain size distribution is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m; the plant fiber is cellulose fiber, the average length is 2.0mm, and the diameter is 10 μm; the particle diameter of the nitrile rubber powder is 100 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
The preparation method comprises the following steps:
1) Premixing water with water consumption of 50% and plant fiber at 14000r/min for 10min to obtain mixture;
2) And mixing the rest components, the rest water and the mixture for 50s at the rotating speed of 4000r/min to obtain the light toughening well cementing material.
Example 3
A light-weight toughening well cementing material is prepared from the following raw materials: the components are calculated according to the mass percentage: 40 parts of G-grade oil well cement, 26 parts of vacuum glass beads and silica fume (containing 93% of SiO) 2 ) 15 parts of plant fiber, 6 parts of nitrile rubber powder, 3 parts of calcium chloride, 5 parts of fluid loss agent G3024.6 parts, retarder JH-100.2 parts, stabilizer SD890.2 parts, and the water-cement ratio is 0.70.
Wherein the G-grade oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m; the plant fiber is cellulose fiber with average length of 2.5mm and diameter of 10 μm; the particle diameter of the nitrile rubber powder is 100 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
The preparation method is the same as example 1.
Example 4
A light toughening well cementing material is prepared from the following raw materials: the components are calculated according to the mass percentage: 33 parts of G-grade oil well cement, 35 parts of vacuum glass beads and silica fume (containing 90% of SiO) 2 ) 14 parts of plant fiber, 4 parts of waste tire rubber powder, 5 parts of calcium sulfate, 4.4 parts of fluid loss additive G33S4.4 parts, 0.3 part of retarder GH-I, 300.3 parts of stabilizer HT-5.3 parts and a water-cement ratio of 0.80.
Wherein the G-grade oil well cement is Yaowang oil well cement, and the specific surface area is 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m; the plant fiber is cellulose fiber, the average length is 3.0mm, and the diameter is 10 μm; the particle size of the waste tire rubber powder is 100 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
The preparation method is the same as example 1.
Comparative example 1
The components are calculated according to the mass percentage: 36 parts of G-grade oil well cement, 55 parts of vacuum glass beads, 5 parts of calcium chloride, 4 parts of fluid loss additive G301A, 0.2 part of retarder GH-I and 850.2 parts of stabilizer SD, wherein the water-cement ratio is 1.0.
The preparation method comprises the following steps:
all the components are mixed with water for 50s at the rotating speed of 4000r/min to obtain the well cementing material.
The performance tests of the well cementation materials prepared in examples 1 to 4 and comparative example 1 showed the following results in table 1:
TABLE 1 results of performance test of well cementing materials obtained in examples 1 to 4 and comparative example 1
From the above embodiments, the invention provides a light toughened well cementing material and a preparation method thereof. As can be seen from table 1 above, in the embodiments 1 to 4 and the comparative example 1, in the comparative example 1, the lightening material (vacuum glass beads) is added, the slurry density is high, the difference between the upper density and the lower density is large, and the water ash is large, so that the slurry sedimentation stability is poor, sedimentation is easy to occur, the free liquid is high, and the thickening time is long due to the instability of the slurry; after the plant fiber, the rubber powder and the vacuum glass beads are added and mixed, the density of the cement paste is effectively reduced, the thickening time is shortened, the stability of a cement paste system is improved, free liquid does not exist, the water loss amount of the cement paste is gradually reduced, the elastic modulus is reduced by 2-3 GPa compared with that of comparative example 1, probably because the addition of the toughening material is reduced, the consistency of the cement paste is increased, the free liquid amount is reduced, and the compactness of the cement paste is improved by filling in gaps of the cement paste, so that the water loss amount of the cement paste is reduced. And the lightweight toughening material is tightly bonded with the cement stone matrix, so that the plasticity and elastic deformation capability of the cement stone can be enhanced, the structure of the cement stone is more compact, and the defects of the cement stone are reduced, thereby improving the mechanical property of the cement stone.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The light toughening well cementing material is characterized by comprising the following components in parts by mass:
the water cement ratio of the light toughening well cementing material is 0.6-0.8.
2. The lightweight toughened well cementing material according to claim 1, wherein said grade G oil well cement is Yaowan oil well cement having a specific surface area of 340m 2 The particle size distribution of the particles is that D10 is less than or equal to 1.95 mu m, D50 is less than or equal to 15.1 mu m, and D90 is less than or equal to 47.5 mu m.
3. The light-weight toughening well cementing material according to claim 1 or 2, wherein the compressive strength of the hollow glass beads is more than or equal to 6000psi; siO in the silica fume 2 Not less than 90 percent, and the particle size distribution is 0.01 to 0.6 mu m.
4. The lightweight toughened well cementing material according to claim 3, wherein the vegetable fibers are cellulose fibers, the average length is 2 to 3mm, and the diameter is 10 to 20 μm.
5. The light-weight toughening well cementing material according to claim 1, 2 or 4, wherein the rubber powder comprises waste tire rubber powder and/or nitrile rubber powder, the particle size of the rubber powder is 20-120 meshes, and the specific surface area is more than or equal to 400m 2 /kg。
6. The lightweight toughened well cementing material according to claim 5, wherein the early strength agent comprises one or more of sodium sulfate, calcium chloride and calcium sulfate; the fluid loss agent comprises one or more of G301A, G302 and G33S; the retarder is GH-I and/or JH-10; the stabilizer comprises one or more of SD85, SD89 and HT-30.
7. The preparation method of the light-weight toughening well cementation material of any one of claims 1 to 6, characterized by comprising the following steps:
1) Premixing water with water consumption of 50% and plant fibers to obtain a mixture;
2) And mixing the rest components, the rest water and the mixture to obtain the light toughened well cementing material.
8. The preparation method according to claim 7, wherein in the step 1), the rotation speed of the premixing is 10000-14000 r/min, and the premixing time is 3-10 min.
9. The method according to claim 7 or 8, wherein the mixing in step 2) is performed at 3800 to 4200r/min for 40 to 60 seconds.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106517804A (en) * | 2016-10-25 | 2017-03-22 | 中国石油集团川庆钻探工程有限公司长庆固井公司 | Hollow glass beads and application thereof |
| CN111849440A (en) * | 2020-06-29 | 2020-10-30 | 尧柏特种水泥技术研发有限公司 | Low-thixotropic low-density oil well cement slurry for oil and gas well cementing treatment |
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