CN109781604B - Channeling measurement method for cement slurry - Google Patents
Channeling measurement method for cement slurry Download PDFInfo
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Abstract
A channeling measurement method for cement slurry relates to a simulation test method for oil, gas and water channeling in the process of solidifying well-cementing cement slurry under a downhole working condition. The channeling measurement method can be used for simulating the solidification weight loss of the well cementation cement slurry and the formation fluid channeling and measuring the anti-channeling resistance, is simple to operate, high in repeatability and good in matching with underground working conditions, and is suitable for researching and developing oil-proof, gas and water channeling additives for well cementation of oil and gas wells and designing anti-channeling well cementation cement slurries.
Description
Technical Field
The application relates to a simulation test method for oil, gas and water channeling of well cementation cement slurry in a solidification process under a downhole working condition.
Background
The well cementation cement slurry of the oil and gas well is mainly used for: (1) the underground fluid with different pressure sources is sealed, and the channeling of oil, gas and water is prevented; (2) the casing and formation are consolidated to support the casing and wellhead.
The key to improve the cementing quality and protect the oil-gas layer is to solve the problem of channeling prevention of cementing slurry in oil-gas fields.
In the process of waiting for setting, due to the hydration and gelation of cement, on one hand, the density of a liquid continuous phase of the cement slurry is continuously reduced, and the effective liquid column pressure of a cement slurry column is continuously reduced, namely, the effective liquid column pressure is continuously lost; on the other hand, the pore passages of the cement are smaller and smaller, the flow resistance in the passages is increased continuously, the structural force of the cement paste is enhanced continuously, and the capability of preventing formation fluids (oil, gas and water) from entering is enhanced continuously. When the effective liquid column pressure after the cement slurry is weightless is less than the pressure of the formation fluid, the formation fluid can flow into the cement slurry in the well. The amount of breakthrough of formation fluids depends on the rate of breakthrough and the time of breakthrough. The larger the cement pore channel is, the smaller the viscosity of fluid in the channel is, the smaller the flow friction resistance of the stratum fluid entering is, and the faster the entering speed is; otherwise the slower the speed. The longer the cement communication pore canal is maintained, the longer the formation fluid breakthrough time is, and vice versa. After the communicating pore passage is closed (the permeability is low enough), no matter how much weight loss is, stratum fluid stops entering.
During cement hydration, the liquid column pressure varies, the size of cement pore channels and flow resistance also vary, and are difficult to measure. How to evaluate the anti-channeling capacity of the cement slurry is a problem to be solved.
The evaluation method of the indoor channeling-preventing capability of the cement paste mainly comprises four types of methods, namely a transition time method, a quasi-dehydration method, an equal static gel strength channeling checking method and a shrinkage depressurization channeling checking method. The anti-channeling capacity of the cement paste is evaluated from different dimensions, but the problems of poor correspondence with underground actual working conditions, single evaluation dimension and poor repeatability of experimental results exist.
Disclosure of Invention
The embodiment of the application provides a cement slurry channeling measurement method, which comprises the following steps:
respectively injecting the same cement paste into the weightlessness cylinder and the channeling measurement cylinder, and enabling the cement paste to synchronously simulate the curing process of the same underground working condition in the weightlessness cylinder and the channeling measurement cylinder;
monitoring the top-bottom pressure difference P of the cement paste column of the weightlessness cylinder in the curing process3(t)；
Top-bottom pressure difference P of cement paste column when weightless cylinder3(t) reduction to equilibrium pressure value P3(t)＝P0＝K-1P2In time, toApplying channeling-measuring fluid to the bottom of the cement paste column of the channeling-measuring cylinder, and ensuring that the pressure difference between the bottom pressure and the top pressure of the cement paste column of the channeling-measuring cylinder is delta P (t) K (P)0-P3(t))；
Wherein, P2The critical liquid column pressure value of the underground cement slurry for starting gas channeling; k is the ratio of the length of the actual sealing section of the underground cement paste to the height of the cement paste of the weightless cylinder;
and monitoring the flow of the channeling fluid entering the cement paste column of the channeling cylinder.
Has the advantages that:
the method synchronously simulates the curing process of the same cement slurry under the same underground working condition in the weightless cylinder and the channeling cylinder under the same channeling condition, and based on the effective liquid column pressure of the weightless cylinder cement slurry column measured in real time, the method can be converted into a critical pressure point at the critical channeling point (namely, the critical equivalent density point) which is the same as the underground cement slurry, and begins to apply a gradual weight loss pressure difference matched with the actual measurement weightless change of the weightless cylinder cement slurry column to the channeling cylinder cement slurry column, and measures the channeling flow and the channeling time of the channeling cylinder cement slurry column from the critical channeling point to the difficult channeling point (channeling point under the channeling condition), thereby being capable of being used for evaluating the channeling-preventing performance of the cement slurry.
The channeling measurement method can be used for simulating the solidification weight loss of the well cementation cement slurry and the formation fluid channeling and measuring the anti-channeling resistance, is simple to operate, high in repeatability and good in matching with underground working conditions, and is suitable for oil, gas and water channeling prevention additive research and development and anti-channeling well cementation cement slurry design of oil and gas well cementation.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a schematic structural view of a channeling device used in a channeling method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a tamper-detection method according to an embodiment of the present application;
the reference signs are: 1. the system comprises a pressure regulating valve, a computer, a flow meter, a valve, a channeling measuring cylinder, a temperature control cylinder, a weightlessness cylinder, a pressure difference meter and a controller, wherein the pressure regulating valve is 2, the computer is 3, the flow meter is 4, the valve is 5, the channeling measuring cylinder is 6, the temperature control cylinder is 7, the weightlessness cylinder is 8.
Detailed Description
The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application.
With reference to fig. 1 and 2, an embodiment of the present application provides a method for detecting a channeling by using cement slurry, including:
respectively injecting the same cement paste into the weight loss cylinder 7 and the channeling measurement cylinder 5, and enabling the cement paste to synchronously simulate the curing process of the same underground working condition in the weight loss cylinder 7 and the channeling measurement cylinder 5;
monitoring the top-bottom pressure difference P of the cement paste column of the weightlessness cylinder 7 in the curing process3(t); the differential pressure value measured by the differential pressure gauge 8 is P3(t) value;
top-bottom pressure difference P of cement paste column when weightless cylinder 73(t) reduction to equilibrium pressure value P3(t)＝P0＝K-1P2In the meantime, the channeling measurement fluid B is applied to the bottom of the cement paste column of the channeling measurement cylinder 5, and the pressure difference between the bottom pressure and the top pressure of the cement paste column of the channeling measurement cylinder 5 is ensured to be Δ P (t) ═ K (P)0-P3(t))；
Wherein, P2The critical liquid column pressure value of the underground cement slurry for starting gas channeling; k is the ratio of the length L of the actual sealing section of the underground cement paste to the height h of the cement paste of the weightless cylinder; if define P1＝P0-P3(t) then P1Can be regarded as the underbalanced pressure values of the cement paste of the weightless cylinder 7 at different moments;
the flow rate of the channeling-fluid B which is entered by the cement paste column of the channeling-detecting cylinder 5 is monitored.
In this embodiment, as shown in fig. 1, the cement slurry synchronously simulates the curing process of the same working condition in the well in the weight loss cylinder 7 and the channeling measurement cylinder 5, that is, the cement slurry is cured and solidified under the condition of the cylindrical structure with the same temperature, pressure and geometric shape, so as to ensure that the cement slurry in the weight loss cylinder 7 and the channeling measurement cylinder 5 is synchronously hydrated and solidified. The cement slurry is solidified in the annular structures of the weightlessness cylinder 7 and the channeling measurement cylinder 5, and the thickness of the annular structures of the two cylinders can be equal to that of the underground well cementation cement sheath.
The channeling measurement device adopted by the channeling measurement method in the embodiment comprises a weight loss cylinder 7, a channeling measurement cylinder 5 and a temperature control cylinder 6, and further comprises an air source system and a control system, wherein the control system comprises a computer 2 and is used for controlling the temperature, the pressure and the like in the channeling measurement process. Wherein, the temperature control cylinder 6 is provided with a heating medium for heating the weightlessness cylinder 7 and the channeling measurement cylinder 5, and the cement paste in the weightlessness cylinder 7 and the channeling measurement cylinder 5 is ensured to be solidified at the set temperature. The air source A of the air source system can apply required pressure to the tops of the cement paste columns in the weightlessness cylinder 7 and the channeling measurement cylinder 5, and the channeling measurement fluid B of the air source system can apply channeling measurement fluid to the bottom of the cement paste column of the channeling measurement cylinder 5. The pipeline for measuring the channeling fluid B is provided with a pressure regulating valve 1, a flowmeter 3 and a valve 4, wherein the pressure regulating valve 1 is used for regulating the pressure of the channeling fluid B, the flowmeter 3 is used for measuring the flow of the channeling fluid B, the valve 4 is used for opening when needed to apply the channeling fluid B to the bottom of the cement paste column of the channeling measuring cylinder 5, and the differential pressure gauge 8 is used for measuring the top-bottom differential pressure of the cement paste column of the weightless cylinder 7 in the curing process.
In this embodiment, the method for detecting channeling by using cement slurry further includes: measuring the total flow rate of the channeling fluid B during the time period from the beginning of application to the time when the channeling fluid B is difficult to enter; alternatively, the total flow rate of channeling-in fluid B during the period from the start of application to the moment of channeling is measured.
In this embodiment, the method for detecting channeling by using cement slurry further includes: measuring the time of the period from the beginning of the application of the channeling-resistant fluid B to the time of the difficult channeling-resistant fluid B; alternatively, the time of the time period from the start of application of channeling-fluid B to the moment of channeling is measured.
By measuring the total flow rate and the flow channeling time of the channeling fluid B in the time period from the beginning of application to the time of difficult channeling or the time of channeling, the anti-channeling capacity of the cement paste can be evaluated at multiple angles.
In the present embodiment, in order to ensure that the pressure difference between the bottom pressure and the top pressure of the cement slurry column of the channeling measurement cylinder 5 is Δ P (t) K (P)0-P3(t)), there may be various methods of applying pressure.
One method is as follows: the cement slurry synchronously simulates the curing process of the same underground working condition in the weightlessness cylinder 7 and the channeling measurement cylinder 5, and the method comprises the following steps: constant pressure of the same magnitude is applied to the top of the cement paste column in the weight loss cylinder 7 and the channeling measurement cylinder 5, and in this case, channeling measurement fluid with gradually increasing pressure is applied to the bottom of the cement paste column of the channeling measurement cylinder 5.
In the method, the same constant pressure is applied to the tops of the cement paste columns in the weight loss cylinder 7 and the channeling measurement cylinder 5, the pressure can be set according to the temperatures of the cement paste columns in the weight loss cylinder 7 and the channeling measurement cylinder 5 in the channeling measurement process, the pressure is not limited, and the method is mainly used for preventing the moisture of the cement paste columns in the weight loss cylinder 7 and the channeling measurement cylinder 5 from being gasified at a higher temperature.
The other method comprises the following steps: the cement slurry synchronously simulates the curing process of the same underground working condition in the weightlessness cylinder 7 and the channeling measurement cylinder 5, and the method comprises the following steps: the same gradually reduced pressure is applied to the top of the cement paste column in the weight loss cylinder 7 and the channeling measurement cylinder 5, and in this case, the channeling measurement fluid B with constant pressure is applied to the bottom of the cement paste column of the channeling measurement cylinder 5.
In this method, the same gradually decreasing pressure P' (t) is applied to the tops of the cement paste columns in the weight loss cylinder 7 and the channeling cylinder 5, for example: the pressure value P' (t) applied at a certain time is P ═ P3(t)/hx (L-h), and a constant pressure value P ″, of the channeling-fluid B applied to the bottom of the cement column of the channeling-measuring cylinder 52(ii) a Wherein, P2The pressure value of the critical liquid column for the gas channeling of the underground cement slurry, namely the pressure value of the formation fluid borne by the underground cement slurry; p3(t) the top and bottom pressure difference values of the cement paste column of the weightless cylinder 5 measured at the moment; l is the length of the actual sealing section of the underground cement paste, and h is the height of the cement paste of the weightlessness cylinder 5 (the height of the cement paste in the weightlessness cylinder 7 is the same as that of the cement paste in the channeling measurement cylinder 5).
An example of a grout channeling method is given below in connection with the actual downhole grout condition.
The data for this example are shown in the following table:
in this embodiment, in the process of downhole cementing, other fluids are injected into the top of the cement slurry, and as the cement slurry solidifies, the effective liquid column pressure of the cement slurry column is continuously reduced (i.e., lost weight), and when the sum of the liquid column pressure of the fluid at the top of the cement slurry and the liquid column pressure of the cement slurry itself is reduced to be equal to the pressure of the formation fluid, the formation fluid may possibly flow into the cement slurry, and at this time, the liquid column pressure value of the cement slurry is the critical liquid column pressure value P2The density of the cement paste is critical equivalent density rho0Since 4000 × 1.5 is 3000 × 1.6+1000 × ρ0Thus, ρ0＝1.2g/cm3；P2＝10×4000×1.5-10×3000×1.6＝10×1000×ρ010 × 1000 × 1.2 KPa. In this embodiment, K is L/h is 1000/1, and the gravitational acceleration g is 10N/kg.
FIG. 2 shows the liquid column equivalent density rho (t) of the cement paste of the weightless cylinder 7, the underbalanced air pressure delta P (t) applied by the channeling-measuring cylinder 5, and the change trend of the channeling-flow rate Q of the channeling-measuring fluid B along with the waiting set time t of the cement paste, wherein t1Represents the moment when the channeling-measuring fluid B begins to be applied (namely the liquid column equivalent density rho (t) of the cement paste is reduced to the critical equivalent density rho (t))0)，t2Representing the moment when the channeling fluid B is difficult to enter.
The channeling measurement process comprises the following steps:
and S1, debugging the weightlessness barrel 7 and the channeling measurement barrel 5 to ensure that the channeling measurement conditions of the two barrels are the same.
S2, injecting the same cement slurry into the weight-loss cylinder 7 and the channeling measurement cylinder 5 respectively, and enabling the cement slurry to synchronously simulate the curing process of the same underground working condition in the weight-loss cylinder 7 and the channeling measurement cylinder 5.
In the curing process, the top parts of the cement paste columns of the weight loss cylinder 7 and the channeling measurement cylinder 5 can apply the same pressure P4The pressure P4The device is used for preventing the moisture of the cement paste in the two cylinders from being gasified in the curing process. P4The pressure P of the top of the cement paste column of the weight loss cylinder 7 and the channeling measurement cylinder 5 can be constant or variable at any time4The same size is ensured.
S3, monitoring the top-bottom pressure difference P of the cement paste column of the weight loss cylinder 7 in the curing process by using a pressure difference meter 83(t)。
Measured top to bottom pressure difference P3(t) the liquid column pressure of the cement slurry column actually being the weight loss cylinder 7; the cement paste gradually loses weight in the curing process, so the measured top-bottom pressure difference P3(t) becomes gradually smaller.
S4, pressure difference P between top and bottom of cement paste column when weightless cylinder 7 is used3(t) reduction to equilibrium pressure value P3(t)＝P0＝K-1P2In the meantime, the channeling measurement fluid B is applied to the bottom of the cement paste column of the channeling measurement cylinder 5, and the pressure difference between the bottom pressure and the top pressure of the cement paste column of the channeling measurement cylinder 5 is ensured to be Δ P (t) ═ K (P)0-P3(t))；
From the above table data, P is calculated0＝K-1P2＝10×1000×1.2/1000＝12Kpa；
Such as: when the pressure difference meter 8 measures the top-bottom pressure difference P of the cement slurry column in the weightless cylinder 73When the value (t) is 10Kpa, the density of the cement paste column converted into the weight loss cylinder 7 is rho (t) ═ P3(t)/gh＝10/10×1＝1.0g/cm3(ii) a At this time, the pressure difference between the bottom pressure and the top pressure of the cement column of the channeling pipe must be ensured to be Δ P (t) K (P)0-P3(t)) -1000 x (12-10) Kpa-2 MPa; then, the pressure P of the channeling-fluid B applied to the bottom of the cement column of the channeling-measuring cylinder 5 at that moment5(t) is: p5(t)＝ΔP(t)+P3(t)+P4。
During channeling, the pressure difference Δ P (t) gradually increases, and thus, the pressure P of the channeling-measuring fluid B is applied5(t) is also gradually increasing. The applied channeling-fluid B may simulate formation fluids.
And S5, monitoring the flow rate of the channeling fluid entering the cement paste column of the channeling cylinder 5.
With reference to fig. 2, the time at which channeling-measuring fluid B begins to be applied during channeling measurement is recorded ast1After the channeling-measuring fluid B is applied, the flow of the channeling-measuring fluid B entering the cement paste column of the channeling-measuring cylinder 5 can be slowly increased, the internal structural force of the cement paste can be continuously enhanced along with the solidification of the cement paste, the channeling-measuring fluid B entering prevention capability is continuously enhanced, and the channeling-measuring fluid B cannot be continuously entered until the channeling-measuring fluid B is measured (the density of the cement paste is the difficult channeling-equivalent density rho at the moment)1Hard-to-flee equivalent density rho1Can not be known before the channeling test is carried out and needs to be known through the channeling result), the flow of the channeling fluid B into the cement slurry column of the channeling measurement cylinder 5 is not increased any more, and the moment is recorded as t at the moment2(ii) a Then, by measuring the time period from the start of application of channeling-measuring fluid B to the time of hard channeling (i.e., channeling time t)2-t1) Total flow rate of inner channeling and channeling time (i.e. transition time of cement slurry) t2-t1The channeling-preventing capability of the cement paste can be evaluated.
In addition, there are some cement slurries in the process of channeling measurement, at the transition time t2-t1The inner cement slurry can be communicated in advance, the flow rate of the channeling body B which enters the cement slurry column of the channeling cylinder 5 at the channeling moment can be increased rapidly, and the total flow rate of the channeling body B entering the time period from the beginning of application to the channeling moment can be pushed outwards according to the trend line of the channeling flow rate before channeling to the time of time.
S6, when the channeling-measuring fluid B is difficult to enter (namely, the weight-loss cylinder cement paste reaches the channeling-difficult equivalent density rho)1) Or when the channel is communicated, the channel measurement is stopped.
And S7, releasing pressure, and disassembling and cleaning the cement in the weight loss cylinder 7 and the channeling measurement cylinder 5.
In the channeling measurement process, each pressure value can be converted into a density value for monitoring. When the liquid column pressure of the underground cement paste is reduced to be equal to the pressure of the formation fluid borne by the underground cement paste, the state of the cement paste is defined as a pressure balance state, and then the cement paste enters an underbalance state. From the above calculation, the critical equivalent density ρ of the cement slurry in the pressure equilibrium state is found0＝1.2g/cm3(ii) a P to be monitored3The value (t) is converted into the liquid column equivalent density rho (t) of the cement paste in real time3(t)/gh, e.g. P at the time point mentioned above3The value of (t) is 10Kpa, converted into whenThe bulk density ρ (t) is 1.0g/cm3. Thus, when the liquid column equivalent density ρ (t) of the cement slurry in the weight loss cylinder 7 is monitored to decrease to the critical equivalent density ρ0＝1.2g/cm3When the equivalent density rho (t) corresponding to the liquid column pressure of the cement paste of the weightless cylinder 7 is reduced to the critical equivalent density rho (t) of the cement paste of the simulated well0In the process, the channeling fluid B is applied to the bottom of the cement slurry column of the channeling measurement cylinder 5, the channeling amount of the cement slurry of the channeling measurement cylinder 5 is measured, and the structural strength of the cement slurry during channeling measurement is the same as that of underground stratum fluid during channeling measurement.
In addition, in the channeling measurement process in the embodiment of the present application, it is ensured that the pressure difference between the bottom pressure and the top pressure of the cement slurry column of the channeling measurement cylinder 5 is Δ P (t) K (P)0-P3(t)), namely, the channeling pressure difference is ensured to be continuously increased along with the development of the hydration time of the cement paste, and the pressure difference is kept consistent with the change of the underbalance pressure caused by the weight loss of the underground cement paste.
Furthermore, in the channeling measurement process in the embodiment of the application, the critical equivalent density rho of the cement slurry is measured0To a refractory equivalent density rho1The total flow rate of the channeling fluid B is measured in the transition time, namely the time window for measuring the total flow rate of the channeling fluid B is consistent with the time window for allowing the downhole formation fluid to enter. If at the transition time t2-t1The inner channeling fluid B is led to the cement slurry of the channeling cylinder 5 in advance and is extended to t according to the trend line of the channeling flow Q before channeling along the time t2The measured ingress flow rate. And the total flow of the fleeing flow under different cement slurries and different working conditions is measured and evaluated at the same transition time, so that the fleeing prevention capability of the cement slurries has quantifiable and comparable indexes.
The channeling measurement method provided by the embodiment of the application simulates the pressure change of the underground slurry column by an equivalent density change method, and is visual, accurate and easy to operate; the anti-channeling capacity of the cement slurry is evaluated according to the channeling time and the channeling flow, and the essential characteristics of the anti-channeling capacity are scientifically reflected. The flow rate is a comprehensive index of the anti-channeling capacity and depends on the anti-channeling capacity of the cement admixture and the porosity of the cement slurry; the channeling time is a sub index of the anti-channeling capacity, reflects the transition time of the cement slurry from the critical equivalent density to the difficult-channeling equivalent density, and is mainly influenced by the over-balance pressure of a well cementation slurry column structure and a cement additive system.
The channeling measurement method has the advantages that the same curing working condition as that of the underground, channeling measurement points with equal critical equivalent density, channeling measurement pressure difference with equal equivalent density change, channeling quantity of an equal equivalent density change window and the like are achieved. The measured total flow rate of the channeling fluid B and the channeling time are closer to the data of the actual condition in the well, and the evaluation on the anti-channeling capacity of the cement paste is more accurate.
According to the channeling measurement method, the weight-loss cylinder 7 and the channeling measurement cylinder 5 are under the same channeling measurement condition, the natural weight loss process of the underground cement slurry is simulated in the weight-loss cylinder 7, and the channeling measurement of the cement slurry entering flow is carried out in the channeling measurement cylinder 5. Based on actual simulation measurement of cement slurry weightlessness, a gradual weight loss pressure difference matched with the change of the measured cement slurry equivalent density is applied to the point of the critical equivalent density same as that of the underground, and the flow-crossing time and flow-crossing rate of the formation fluid from the critical equivalent density of the cement slurry to the density of the difficult-to-flow equivalent are measured.
The channeling measurement method in the embodiment of the application relates to a method for measuring and evaluating the solidification weight loss, stratum fluid channeling simulation and anti-channeling resistance of well cementation cement slurry, is simple to operate, high in repeatability and good in matching performance with underground working conditions, and is suitable for oil, gas and water channeling prevention additive research and development and anti-channeling well cementation cement slurry design of oil and gas well cementing.
Claims (6)
1. A cement slurry channeling method is characterized by comprising the following steps:
respectively injecting the same cement paste into the weightlessness cylinder and the channeling measurement cylinder, and enabling the cement paste to synchronously simulate the curing process of the same underground working condition in the weightlessness cylinder and the channeling measurement cylinder;
monitoring the top-bottom pressure difference P of the cement paste column of the weightlessness cylinder in the curing process3(t)；
Top-bottom pressure difference P of cement paste column when weightless cylinder3(t) reduction to equilibrium pressure value P3(t)＝P0＝K-1P2In the meantime, a measuring tool is applied to the bottom of the cement paste column of the channeling measuring cylinderChanneling the fluid, and ensuring that the pressure difference between the bottom pressure and the top pressure of the cement paste column of the channeling cylinder is delta P (t) K (P)0-P3(t))；
Wherein, P2The critical liquid column pressure value of the underground cement slurry for starting gas channeling; k is the ratio of the length of the actual sealing section of the underground cement paste to the height of the cement paste of the weightless cylinder;
monitoring the flow of channeling-measuring fluid which is entered by a cement paste column of the channeling-measuring cylinder;
the method further comprises the following steps: measuring the total flow of the channeling fluid in the time period from the beginning of application to the time period of difficult channeling; or measuring the total flow rate of the channeling fluid during the time period from the beginning of the application to the channeling moment;
the method for synchronously simulating the curing process of the same underground working condition of the cement slurry in the weightlessness cylinder and the channeling measurement cylinder comprises the following steps: and applying the same pressure on the top of the cement paste columns of the weight loss cylinder and the channeling measurement cylinder.
2. The method of grout channeling according to claim 1, further comprising:
measuring the time from the beginning of the application of the channeling-measuring fluid to the time period of difficult channeling; alternatively, the time of the period from the start of the application of the channeling fluid to the moment of channeling is measured.
3. The method for measuring the channeling of the cement paste according to claim 1, wherein the step of applying the same pressure to the tops of the cement paste columns of the weight loss cylinder and the channeling measuring cylinder comprises the following steps: and applying constant pressure with the same magnitude on the tops of the cement paste columns in the weight loss cylinder and the channeling measurement cylinder.
4. The cement slurry channeling method of claim 3, wherein said applying channeling fluid to a bottom portion of a cement slurry column of a channeling cylinder comprises: channeling fluid with gradually increased pressure is applied to the bottom of the cement paste column of the channeling cylinder.
5. The method for measuring the channeling of the cement paste according to claim 1, wherein the step of applying the same pressure to the tops of the cement paste columns of the weight loss cylinder and the channeling measuring cylinder comprises the following steps: and applying gradually reduced pressure with the same magnitude on the tops of the cement paste columns in the weight loss cylinder and the channeling measurement cylinder.
6. The cement slurry channeling method of claim 5, wherein said applying channeling fluid to a bottom portion of a cement slurry column of a channeling cylinder comprises: and applying the channeling-measuring fluid with constant pressure to the bottom of the cement paste column of the channeling-measuring cylinder.
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