CN107607426A - The deposition rate and voidage assay method of a kind of cementing concrete mixture system - Google Patents
The deposition rate and voidage assay method of a kind of cementing concrete mixture system Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 16
- 230000008021 deposition Effects 0.000 title abstract description 7
- 238000003556 assay Methods 0.000 title abstract 2
- 239000004568 cement Substances 0.000 claims abstract description 145
- 239000007787 solid Substances 0.000 claims abstract description 79
- 238000000034 method Methods 0.000 claims abstract description 38
- 239000002002 slurry Substances 0.000 claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007790 solid phase Substances 0.000 claims description 46
- 239000011800 void material Substances 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 17
- 239000011707 mineral Substances 0.000 claims description 17
- 238000012856 packing Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 239000012265 solid product Substances 0.000 abstract 6
- 239000002245 particle Substances 0.000 description 9
- 238000009825 accumulation Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000000151 deposition Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- -1 cenospheres Chemical compound 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000469 dry deposition Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
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Abstract
The embodiment of the present application, which provides a kind of deposition rate of cementing concrete mixture system and voidage assay method, this method, to be included：Accumulated from water solid than selecting a water solid product ratio in set；Under water solid product ratio, the water of specified amount is added into agitator；According to well cementation demand mixture cement and miberal powder, cement mixing system is obtained；Cementing concrete mixture system is added into agitator in batches and stirred, obtains slurry；Solid volume content of the water solid product than lower cement mixing system is determined according to the volume and weight of slurry；Above step is repeated, obtains water solid product than each water solid product in set than the solid volume content of lower cement mixing system；Optimal water solid product ratio when solid volume content is maximum is determined, and the maximum is confirmed as to the deposition rate of cement mixing system；According to the deposition rate of cement mixing system, the voidage of acquisition cement mixing system.The embodiment of the present application can improve the deposition rate of cementing concrete mixture system and the accuracy rate of voidage measure.
Description
Technical Field
The application relates to the technical field of well cementation engineering, in particular to a method for measuring the stacking rate and the void ratio of a well cementation cement mixing system.
Background
The well cementation cement stacking rate is the ratio of the actual volume to the apparent volume of solid particles in a well cementation cement mixing system, the well cementation cement void ratio is the ratio of the void volume between solid particles in the well cementation cement mixing system to the apparent volume, and the sum of the two is equal to 1. Research shows that the accumulation rate and the void ratio of well cementation cement have great influence on the performance of a cement paste system, and finally the well cementation quality of an oil-gas well and the long-term sealing integrity of an annulus can be influenced. Therefore, the determination of the deposition rate and the porosity of the well cementation cement is of great significance.
For the measurement of the deposition rate and the porosity of the well cementation cement, a dry deposition method and a minimum water demand method are mainly adopted at present. The dry accumulation method is to measure the accumulation rate under a certain accumulation state in a certain container, the measurement result is greatly influenced by the accumulation state, the particles in the well cementation cement mixing system are very small, and the electrostatic attraction and Van der Waals force among the particles also have great influence on the accumulation rate result; the minimum water demand method is a method in which the porosity is measured by measuring the water demand at the moment when cement is converted from a powder particle state to a slurry state, and it is considered that the water demand just fills the gaps between the particles, and as a result, the influence of the subjective factors is large. Therefore, the above two methods have the problem of inaccurate measurement results. Therefore, how to improve the accumulation rate of the well cementation cement and the accuracy rate of the determination of the void ratio is a technical problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the application aims to provide a method for measuring the stacking rate and the porosity of a well cement mixing system, so as to improve the accuracy of measuring the stacking rate and the porosity of well cement.
In order to achieve the above object, in one aspect, the present application provides a method for measuring a packing rate and a void ratio of a cement mixture system for well cementation, which includes:
selecting a water-solid volume ratio from a water-solid volume ratio set;
adding a specified amount of water to the mixer at the water to solids ratio;
mixing cement and mineral powder according to a preset well cementation requirement to obtain a cement mixing system;
adding the well cementation cement mixing system into the stirrer in batches and stirring uniformly to obtain slurry;
determining the solid phase volume content of the cement mixing system under the water-solid volume ratio according to the volume and the weight of the slurry;
repeating the steps to obtain the solid phase volume content of the cement mixing system in each water-solid volume ratio in the water-solid volume ratio set;
determining the optimal water-solid volume ratio when the solid phase volume content is the maximum value, and determining the solid phase volume content corresponding to the optimal water-solid volume ratio as the stacking rate of the cement mixing system;
and acquiring the void ratio of the cement mixing system according to the stacking rate of the cement mixing system.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixed system, the solid phase volume content of the cement mixed system in the water-solid volume ratio is determined according to the following formula:
wherein,Vsis the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwIs the water-solid volume ratio, rhow、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of cement and the nth mineral powder are respectively,is the solid phase volume content.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixed system, the porosity of the cement mixed system is obtained according to the following formula:
wherein phi is the void ratio of the cement mixed system, gamma is the stacking ratio of the cement mixed system, and VsIs the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwbIs the optimal water-solid volume ratio, rho, corresponding to the maximum solid volume contentw、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of the cement and the nth mineral powder are respectively.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the mineral powder comprises mineral powder with preset mixing amount and variety.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the well cementation cement mixing system is added into the stirrer in batches and stirred uniformly to obtain slurry, and the method comprises the following steps:
adding the first part of the well cementation cement mixing system into the stirrer, and stirring at a set first rotating speed for a first stirring time;
and dividing the rest part of the well cementation cement mixing system into a plurality of equal parts, and adding the equal parts into the stirrer in batches, wherein after each addition, stirring is carried out at a set second rotating speed for a second stirring time.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the first stirring time comprises one minute.
In the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the second stirring time includes one minute.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the first part of the well cementation cement mixing system comprises a half of the well cementation cement mixing system.
The method for determining the stacking rate and the void ratio of the well cementation cement mixing system comprises the following steps:
the rest part of the well cementation cement mixing system is divided into four equal parts.
According to the method for measuring the stacking rate and the porosity of the well cementation cement mixing system, the mineral powder comprises but is not limited to silica fume, quartz sand, slag, floating beads and iron ore powder.
According to the technical scheme provided by the embodiment of the application, after the solid phase volume content of the cement mixing system in each water-solid volume ratio in the solid volume ratio set is obtained, the optimal water-solid volume ratio when the solid phase volume content is the maximum value can be determined, and the solid phase volume content corresponding to the optimal water-solid volume ratio is determined as the stacking rate of the cement mixing system; and then, the void ratio of the cement mixing system can be obtained according to the stacking rate of the cement mixing system, so that the solid phase volume content and the void ratio of the well cementation cement mixing system are measured. According to the method and the device, the stacking rate and the porosity of the cement mixing system under the optimal water-solid volume ratio can be obtained, so that the stacking rate and the porosity measurement accuracy of the well cementation cement mixing system can be improved, and the method and the device are favorable for obtaining the excellent compatibility composition of the well cementation cement.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort. In the drawings:
FIG. 1 is a flow chart of a method for measuring a packing fraction and a void fraction of a mixed system of well cement according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an experimental principle for measuring a packing rate and a void ratio of well cementation cement in an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the method for measuring the packing fraction and the porosity of a cement mixture system for well cementation according to an embodiment of the present invention may include:
s101, selecting one water-solid volume ratio from the water-solid volume ratio set.
In the examples of the present application, the volume ratio of water to solid indicates the volume ratio of water to solid. The water-solid volume ratio set is a set of a plurality of water-solid volume ratios specified in advance. For example, in an exemplary embodiment of the present application, the set of water-to-solid volume ratios may comprise 8 water-to-solid volume ratios: 1.14,1.2,1.26,1.32,1.38,1.44,1.5,1.56.
And S102, adding a specified amount of water into the stirrer at the water-solid volume ratio.
In one embodiment of the present application, the agitator may be any agitator suitable for agitating a mixture of water, cement, and mineral fines.
And S103, mixing cement and mineral powder according to a preset well cementation requirement to obtain a cement mixing system.
In an embodiment of the application, the cement amount, the preset mixing amount and the mineral powder of the variety can be determined according to the preset well cementation requirement, so that a cement mixing system is obtained through mixing and proportioning. The proportion can be weight proportion or volume proportion. In an exemplary embodiment of the present application, the volume ratio is, for example, 80% cement and 20% ore powder. Such as, but not limited to, silica fume, quartz sand, slag, cenospheres, iron ore fines, and the like.
And S104, adding the well cementation cement mixing system into the stirrer in batches and stirring uniformly to obtain slurry.
In an embodiment of the application, the adding the well cementation cement mixing system into the stirrer in batches and stirring uniformly to obtain slurry may include the following steps:
adding the first part of the well cementation cement mixing system into the stirrer, and stirring at a set first rotating speed for a first stirring time; in an exemplary embodiment of the present application, the first part of the cementing cement mixing system may be, for example, half of the cementing cement mixing system. In an exemplary embodiment of the present application, the first stirring time may be, for example, 1 minute or the like.
And dividing the rest part of the well cementation cement mixing system into a plurality of equal parts, and adding the equal parts into the stirrer in batches, wherein after each addition, stirring is carried out at a set second rotating speed for a second stirring time. In an exemplary embodiment of the present application, the dividing the remaining portion of the well cement mixing system into equal parts may be, for example, dividing the remaining portion of the well cement mixing system into four equal parts. The second stirring time may be, for example, 1 minute or the like.
And S105, determining the solid phase volume content of the cement mixing system under the water-solid volume ratio according to the volume and the weight of the slurry.
In an embodiment of the present application, the determining the solid phase volume content of the cement mixing system under the water-solid volume ratio according to the volume and the weight of the slurry may be determining the solid phase volume content of the cement mixing system under the water-solid volume ratio according to the following formula:
wherein, VsIs the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwIs the water-solid volume ratio, rhow、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of cement and the nth mineral powder are respectively,is to be fixedPhase volume content.
In one embodiment of the present application, to facilitate the determination of the volume and weight of the slurry, the slurry in the mixer may be transferred to a measuring cylinder.
And S106, repeating the steps to obtain the solid phase volume content of the cement mixing system in each water-solid volume ratio in the water-solid volume ratio set.
In an embodiment of the present application, the set of water-solid volume ratios includes a plurality of water-solid volume ratios, and therefore, after the calculation of the solid phase volume content of the cement mixing system at one of the water-solid volume ratios is completed through steps S101 to S106, the solid phase volume content of the cement mixing system at each water-solid volume ratio in the set of water-solid volume ratios can be obtained by repeating steps S101 to S105.
S107, determining the optimal water-solid volume ratio when the solid phase volume content is the maximum value, and determining the solid phase volume content corresponding to the optimal water-solid volume ratio as the stacking rate of the cement mixing system.
Referring to FIG. 2, the voids between the particles of the well-cementing material may be filled with water or air, and studies have shown that when the water-solid volume is low, the water content is insufficient to make the particles of the well-cementing material (i.e., the mixture of cement and mineral fines) into a slurry, and many of the voids between some of the particles of the well-cementing material are filled with air; with the rising of the water-solid volume ratio, the air-solid volume ratio u (namely the volume ratio of air to solid phase in the slurry) is reduced, and the solid phase volume content is increased; when the water-solid volume ratio is high, the solid phase volume content is low due to the high specific gravity of water, and the solid phase volume content decreases as the water-solid volume ratio increases. It can be seen that when the water-solid volume ratio gradually changes from low to high, an optimal water-solid volume ratio u existswb(see FIG. 2) when the void to solid volume ratio ua(i.e., the volume ratio of voids to solid phase in the slurry) is the smallest (as shown in fig. 2), while the volume content of solid phase is the largest. Therefore, in the embodiment of the application, after the solid phase volume content of the cement mixing system with different water-solid volume ratios is obtained, the solid phase volume content is obtainedAnd determining the optimal water-solid volume ratio when the solid phase volume content is the maximum value through comparison, and determining the solid phase volume content corresponding to the optimal water-solid volume ratio as the stacking rate of the cement mixing system.
And S108, acquiring the void ratio of the cement mixed system according to the stacking rate of the cement mixed system.
In an embodiment of the present application, the porosity of the cement mixing system can be obtained according to the following formula:
wherein phi is the void ratio of the cement mixed system, gamma is the stacking ratio of the cement mixed system, and VsIs the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwbIs the optimal water-solid volume ratio, rho, corresponding to the maximum solid volume contentw、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of the cement and the nth mineral powder are respectively.
In an exemplary embodiment of the present application, the set of water-to-solid volume ratios comprises 8 water-to-solid volume ratios: 1.14, 1.2, 1.26, 1.32, 1.38, 1.44, 1.5 and 1.56, and the volume ratio of cement to mineral powder is as follows: 80% of cement and 20% of mineral powder. By the determination method of the embodiment of the application, the solid phase volume contents corresponding to the cement under the 8 water-solid volume ratios are respectively as follows: 0.6152,0.6588,0.7210,0.7125,0.6854,0,6420,0.6048,0.556. It is clear that the maximum solid phase volume content therein is 0.7210. Thus, the porosity of the cement admixture system was calculated to be 0.2790 from the formula in step S108.
After the solid phase volume content of the cement mixing system in each water-solid volume ratio in the solid volume ratio set is obtained, the optimal water-solid volume ratio when the solid phase volume content is the maximum value can be determined, and the solid phase volume content corresponding to the optimal water-solid volume ratio is determined as the stacking rate of the cement mixing system; and then, the void ratio of the cement mixing system can be obtained according to the stacking rate of the cement mixing system, so that the solid phase volume content and the void ratio of the well cementation cement mixing system are measured. According to the method and the device, the stacking rate and the porosity of the cement mixing system under the optimal water-solid volume ratio can be obtained, so that the stacking rate and the porosity measurement accuracy of the well cementation cement mixing system can be improved, and the method and the device are favorable for obtaining the excellent compatibility composition of the well cementation cement.
In addition, the embodiment of the application can be widely applied to the measurement of the solid phase volume content and the porosity of a well cementation cement mixing system consisting of well cementation materials such as oil well cement, micro silicon powder, quartz sand, superfine slag, floating beads, iron ore powder and the like, can effectively guide the design and development of a cement paste system, promote the development of the cement paste system, prevent annular micro annular gaps, effectively improve the well cementation quality, and provide technical support for the long-term, safe and effective operation of an oil-gas well.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for measuring the stacking rate and the void ratio of a well cementation cement mixing system is characterized by comprising the following steps:
selecting a water-solid volume ratio from a water-solid volume ratio set;
adding a specified amount of water to the mixer at the water to solids ratio;
mixing cement and mineral powder according to a preset well cementation requirement to obtain a cement mixing system;
adding the well cementation cement mixing system into the stirrer in batches and stirring uniformly to obtain slurry;
determining the solid phase volume content of the cement mixing system under the water-solid volume ratio according to the volume and the weight of the slurry;
repeating the steps to obtain the solid phase volume content of the cement mixing system in each water-solid volume ratio in the water-solid volume ratio set;
determining the optimal water-solid volume ratio when the solid phase volume content is the maximum value, and determining the solid phase volume content corresponding to the optimal water-solid volume ratio as the stacking rate of the cement mixing system;
and acquiring the void ratio of the cement mixing system according to the stacking rate of the cement mixing system.
2. The method for measuring the packing fraction and the void fraction of a cement mixture system for well cementation according to claim 1, wherein the solid volume content of the cement mixture system in terms of the water-solid volume ratio is determined according to the following formula:
<mrow> <msub> <mi>V</mi> <mi>s</mi> </msub> <mo>=</mo> <mfrac> <mi>M</mi> <mrow> <msub> <mi>&rho;</mi> <mi>w</mi> </msub> <msub> <mi>u</mi> <mi>w</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>c</mi> </msub> <msub> <mi>R</mi> <mi>c</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>2</mn> </msub> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>n</mi> </msub> <msub> <mi>R</mi> <mi>n</mi> </msub> </mrow> </mfrac> <mo>;</mo> </mrow>
<mrow> <mfrac> <msub> <mi>V</mi> <mi>s</mi> </msub> <mi>V</mi> </mfrac> <mo>=</mo> <mfrac> <mi>M</mi> <mrow> <mi>V</mi> <mrow> <mo>(</mo> <msub> <mi>&rho;</mi> <mi>w</mi> </msub> <msub> <mi>u</mi> <mi>w</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>c</mi> </msub> <msub> <mi>R</mi> <mi>c</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>2</mn> </msub> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>n</mi> </msub> <msub> <mi>R</mi> <mi>n</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>;</mo> </mrow>
wherein, VsIs the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwIs the water-solid volume ratio, rhow、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of cement and the nth mineral powder are respectively,is the solid phase volume content.
3. The method for measuring the packing fraction and the void fraction of a cement mixture system for well cementation according to claim 1, wherein the void fraction of the cement mixture system is obtained according to the following formula:
<mrow> <mi>&gamma;</mi> <mo>=</mo> <mfrac> <mi>M</mi> <mrow> <mo>(</mo> <msub> <mi>&rho;</mi> <mi>w</mi> </msub> <msub> <mi>u</mi> <mrow> <mi>w</mi> <mi>b</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>c</mi> </msub> <msub> <mi>R</mi> <mi>c</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>2</mn> </msub> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>n</mi> </msub> <msub> <mi>R</mi> <mi>n</mi> </msub> <mo>)</mo> <mi>V</mi> </mrow> </mfrac> </mrow>
<mrow> <mi>&phi;</mi> <mo>=</mo> <mn>1</mn> <mo>-</mo> <mi>&gamma;</mi> <mo>=</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>M</mi> <mrow> <mo>(</mo> <msub> <mi>&rho;</mi> <mi>w</mi> </msub> <msub> <mi>u</mi> <mrow> <mi>w</mi> <mi>b</mi> </mrow> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>c</mi> </msub> <msub> <mi>R</mi> <mi>c</mi> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>1</mn> </msub> <msub> <mi>R</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&rho;</mi> <mn>2</mn> </msub> <msub> <mi>R</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&rho;</mi> <mi>n</mi> </msub> <msub> <mi>R</mi> <mi>n</mi> </msub> <mo>)</mo> <mi>V</mi> </mrow> </mfrac> </mrow>
wherein phi is the void ratio of the cement mixed system, gamma is the stacking ratio of the cement mixed system, and VsIs the solid phase volume in the slurry, M is the mass of the slurry, V is the volume of the slurry, uwbIs the optimal water-solid volume ratio, rho, corresponding to the maximum solid volume contentw、ρcAnd ρnDensity R of water, cement and n ore powdercAnd RnThe volume fractions of the cement and the nth mineral powder are respectively.
4. The method for measuring the stacking rate and the porosity of the well cementation cement mixing system as claimed in claim 1, wherein the ore powder comprises a predetermined amount and variety of ore powder.
5. The method for measuring the packing fraction and the void fraction of the cement mixing system for well cementation according to claim 1, wherein the step of adding the cement mixing system for well cementation into the stirrer in batches and stirring the mixture uniformly to obtain slurry comprises the following steps:
adding the first part of the well cementation cement mixing system into the stirrer, and stirring at a set first rotating speed for a first stirring time;
and dividing the rest part of the well cementation cement mixing system into a plurality of equal parts, and adding the equal parts into the stirrer in batches, wherein after each addition, stirring is carried out at a set second rotating speed for a second stirring time.
6. The method of claim 5, wherein the first mixing time comprises one minute.
7. The method of claim 5, wherein the second mixing time comprises one minute.
8. The method for measuring the packing fraction and the void fraction of a well cementation cement mixing system as claimed in claim 5, wherein the first part of the well cementation cement mixing system comprises half of the well cementation cement mixing system.
9. The method for determining the packing fraction and the void fraction of a well cementation cement mixing system as claimed in claim 5 or 8, wherein the dividing the remaining part of the well cementation cement mixing system into equal parts comprises:
the rest part of the well cementation cement mixing system is divided into four equal parts.
10. The method for measuring the packing fraction and the void fraction of a well cementation cement mixing system as claimed in claim 1, wherein the ore powder includes but is not limited to silica fume, quartz sand, slag, floating beads, iron ore powder.
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| CN110414177A (en) * | 2019-08-07 | 2019-11-05 | 东北大学 | Design method is accumulated based on amendment two-component particle gap interactional between particle |
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| CN110414177B (en) * | 2019-08-07 | 2023-04-18 | 东北大学 | Design method for correcting binary particle gap accumulation based on interparticle interaction |
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