Wall-fixing slurry transfer system and slurry preparation method

Abstract

The solid wall slurry transfer system comprises a temporary storage unit, and the temporary storage unit comprises a first transfer bin, a flow dividing mechanism, a second transfer bin, a pressure equalizing pipe and a third transfer bin which are used for temporarily storing solid wall slurry with different properties in a grading mode and communicate with one another in sequence; the system comprises a data module, a dosing mechanism, a blending unit, a stirring mechanism and an information processing unit, and the information processing unit calculates the type and quantity of chemicals needing to be added between the current slurry and the target slurry by calling the mapping relation data in the data module, and sends a dosing instruction to the dosing mechanism until the current slurry is blended into the target slurry. According to the invention, the foundation slurry can be flexibly prepared in the slurry supply process, so that the slurry with different performances can be dynamically output, the slurry can be completely matched with the stratum, and the problems of mismatching and even slurry performance failure caused by the fact that the prefabricated slurry faces a complex and changeable stratum environment are solved.

Description

Technical Field

[0001] The invention relates to the technical field of geological treatment, the technical field of mud treatment in anti-seepage wall foundation treatment, and in particular to a wall solidifying slurry transfer system and a slurry modulation method. Background Art

[0002] During the excavation of the anti-seepage wall trench, mud (such as bentonite slurry or polymer mud) is the core medium to ensure construction safety and quality. Its role runs through key links such as trenching, slag cleaning, wall protection and environmental protection control.

[0003] First, the mud maintains the stability of the trench wall through hydrostatic pressure balance and mud skin protection. The hydrostatic pressure generated by the mud density can offset the lateral pressure of the formation and prevent the collapse of loose sand layers or weak soil. At the same time, the colloidal particles in the mud form a dense filter cake on the trench wall, blocking water from penetrating into the formation and reducing soil softening or expansion. For example, in a gravel formation, if the mud density is insufficient, the trench wall is prone to instability due to particle sliding.

[0004] Secondly, the mud suspends and removes drill cuttings through viscosity and circulating flow. The viscosity of the mud keeps the drill cuttings suspended in the trough to prevent sedimentation and siltation at the bottom of the trough; at the same time, the circulating pumping system takes the drill cuttings out of the trough to keep the trough clean and provide a flat base for subsequent concrete pouring. In addition, the mud has both lubrication and cooling functions. During mechanical excavation, the mud reduces the friction resistance between the drill tool and the formation, prolongs the life of the equipment and improves efficiency; its circulating flow can also take away the heat generated by mechanical friction to prevent the drill bit from overheating. In hard rock formations, mud lubrication can significantly reduce the energy consumption of the slot milling machine. Although mud has been developed and improved for a long time in the geological treatment process, the existing mud preparation technology still has obvious shortcomings and problems, which are mainly reflected in the following two aspects:

[0005] On the one hand, the adaptability of complex formations is limited: under harsh conditions (such as ultra-high temperature, high salinity or large fracture formations), the mud is prone to performance failure (such as high-temperature gelation, salt invasion flocculation), causing the mud to seriously deviate from normal values in terms of viscosity retention, thermal stability retention, and anti-filtration performance, and cannot meet construction requirements.

[0006] On the other hand, the intelligence level of mud preparation is low: the real-time control of mud parameters still relies on manual experience, and it is difficult to achieve full process automation; more importantly, the existing mud preparation processes are basically fixed, and it is impossible to link mud preparation with the real-time working conditions of the formation, so as to adjust the mud performance in time, making it difficult for mud to play its due technical effect in the complex and changeable formation environment.

[0007] Furthermore, the amount of mud used will continue to increase as the construction progresses, and as the depth of the stratum increases, the complexity of its structure and the polygons will become more difficult to predict. Therefore, the dynamic slurrying method cannot cover all geological treatment projects. For projects with large mud consumption, a mud transfer station is required to temporarily store prefabricated mud and continuously supply it to the stratum; however, the existing transfer stations also do not have the ability to dynamically modulate mud. Therefore, the mud demand for complex strata is still a technical problem that needs to be solved urgently in this field. Summary of the invention

[0008] In order to solve the problem that the existing mud transfer station cannot provide wall-fixing slurries with different performances according to actual formation changes, resulting in flocculation failure of prefabricated mud after the formation temperature difference changes, and the problem that the anti-filtration performance of the prefabricated mud does not meet the standard when the formation is soft and there is leakage, resulting in ineffective wall fixing and even empty space; the present application provides a new wall-fixing slurry transfer system and slurry modulation method, which can quickly and intelligently transport slurry that meets the current formation requirements to the formation, and can always maintain good wall fixing performance.

[0009] In order to achieve the above purpose, the technical solution adopted in this application is:

[0010] The wall-fixing slurry transfer system provided by the present invention comprises a temporary storage unit, wherein the temporary storage unit comprises a first transfer bin, a diversion mechanism, a second transfer bin, a pressure-equalizing pipe and a third transfer bin, which are used for classifying and temporarily storing wall-fixing slurries of different properties and are sequentially connected; a cyclone vibrating screen for filtering and screening formation return slurry is arranged on the first transfer bin, and the slurry storage part of the cyclone vibrating screen is connected to the first transfer bin;

[0011] A preparation unit, the preparation unit includes a data module for storing mapping relationship data between different proportions of reagents and different performance parameters of basic slurry; a dosing mechanism for adding reagents to the second transfer bin and / or the third transfer bin; and a first detection mechanism and a second detection mechanism for collecting respectively installed in the second transfer bin and the third transfer bin; a temperature control mechanism for adjusting the temperature of the mud is also installed in the second transfer bin and the third transfer bin;

[0012] A stirring mechanism, comprising a plurality of paddle stirrers respectively installed in the first transfer bin, the second transfer bin and the third transfer bin for stirring the slurry;

[0013] The information processing unit calculates the type and quantity of the medicine to be added between the current slurry and the target slurry by calling the mapping relationship data in the data module, and sends a medicine adding instruction to the medicine adding mechanism until the current slurry is prepared into the target slurry.

[0014] Preferably, the mapping relation data of the data module includes the mapping relation data between the viscosity value μ of the wall-building slurry and the temperature T, the mapping relation data between the viscosity value μ of the wall-building slurry and the additive proportion, and the mapping relation data between the filtration loss volume V of the wall-building slurry and the additive proportion.

[0015] Preferably, the mapping relations between the viscosity value μ of the wall-building slurry, the temperature T, and the additive proportion are calculated by the following formulas

[0016]

[0017] wherein, T0 is the reference temperature / ambient temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient, n represents the number of different types of additives considered in the model, and W i represents the weight factor, and W i >0 indicates thickening, and W i <0 indicates viscosity reduction; C i represents the mass percentage concentration of the i-th additive in the water-based slurry.

[0018] Preferably, the mapping relation between the filtration loss volume V of the wall-building slurry and the additive proportion is calculated by the following formula

[0019]

[0020] wherein, T represents the current temperature, k0 is the reference dynamic filtration coefficient; β is the temperature sensitivity coefficient, obtained by fitting through actual experiments in the dynamic filtration instrument; γ i represents the additive inhibition efficiency, the unit concentration inhibition efficiency of the i-th filtration reducer on the filtration loss amount, with the unit %-1; D i is the mass percentage concentration of the i-th filtration reducer in the slurry; n represents the time exponent, that is, the power-law exponent of the relationship between the filtration loss volume and the t time under dynamic conditions; m represents the types of additives.

[0021] Preferably, both the first detection mechanism and the second detection mechanism include a viscosity sensor, a density sensor, a temperature sensor, and a pH value sensor.

[0022] The present invention also provides a method for preparing the wall-building slurry, which is prepared by using the above-mentioned wall-building slurry transfer system, and specifically includes the following steps:

[0023] Step STP100, using the first detection mechanism arranged in the second transfer bin to detect and collect the viscosity value μ0 of the preset slurry obtained under the condition of the reference temperature T0 based on the preset formula; and establishing an exponential decay model μ(T) between the preset slurry viscosity μ and the temperature T:

[0024]

[0025] Among them, T0 is the normal temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient;

[0026] Step STP200: Based on the formula of the solid-wall slurry in step STP100, use the method of controlling variables to traverse different proportions of a single additive to prepare a modulated slurry under the normal temperature T0 - T, and then collect the viscosity value μ of the modulated slurry through the first detection mechanism again and record it;

[0027] Step STP300: Replace the type of additive and repeat steps STP100 - STP200 until all the additives in the dosing mechanism are traversed and the mapping data of different additives under the normal temperature T0 - T are recorded; On the basis of the exponential decay model μ(T) established in step STP100, further establish a modified exponential decay model μ′(T) that incorporates the influence of different additive proportions on the viscosity value μ of the modulated slurry:

[0028]

[0029] Among them, n represents the number of different types of additives considered in the model, W i represents the weight factor, W i > 0 indicates thickening, W i <0 indicates viscosity reduction; C i represents the mass percentage concentration of the i-th additive in the water-based slurry;

[0030] Step STP400: Manually specify the target slurry viscosity or the third detection mechanism set in the formation detects the formation environment in real time and sends it to the information processing unit. The information processing unit calculates the target slurry viscosity required for the current formation environment according to the exponential decay model μ′(T), calculates the types and quantities of the agents to be added by calculating the difference between the viscosity value of the solid-wall slurry in the third transfer bin (13) and the target slurry viscosity, and sends a dosing instruction to the dosing mechanism until the current solid-wall slurry is formulated into the target slurry.

[0031] To further improve the matching between the solid-wall slurry and the formation environment, preferably, it further includes a modulation step for the fluid loss resistance of the solid-wall slurry, specifically as follows:

[0032] Step STP500: Establish an association model V(T,γ) between the fluid loss volume V of the current solid-wall slurry and the additive proportion,

[0033]

[0034] Among them, T represents the current temperature, k0 is the reference dynamic fluid loss coefficient; β is the temperature sensitivity coefficient, obtained by fitting through actual experiments in the dynamic fluid loss instrument; γ iRepresenting the additive inhibition efficiency, the inhibition efficiency of the i-th filtrate reducer on the filtrate volume per unit concentration, unit %-1; D i The mass percentage concentration of the i-th filtrate reducer in the slurry; n represents the time exponent, that is, the power-law exponent of the relationship between the filtrate volume and time t under dynamic conditions; m represents the type of additive;

[0035] Step STP600, determine whether the current wellbore slurry meets the anti-filtration requirements of the current formation by calculating V; if the volume difference ΔV is positive or greater than the preset value, it is necessary to calculate the type and amount of additives to be added to the current wellbore slurry according to the associated model in step STP500, so that the expected filtrate volume V′ of the modulated wellbore slurry is 85% V;

[0036] Step STP700, continuously detect whether the anti-filtration of the modulated wellbore slurry meets the requirements of the current formation. If the volume difference ΔV is still positive or greater than the preset value, repeat step STP600. If the volume difference ΔV is negative or less than the preset value, continuously monitor until the construction is completed.

[0037] Beneficial effects:

[0038] Based on the existing mud transfer station, the present invention adds an information processing unit and a data module for storing the mapping relationship data between the slurry performance parameters and the weight ratios of different additives at different temperatures. The mapping relationship data can quickly calculate the gap between the current slurry and the target slurry required by the current formation, so as to add additives for increasing / decreasing viscosity, improving thermal stability, and improving / reducing anti-filtration ability to the current slurry through the dosing mechanism, enabling flexible modulation of the basic slurry during the slurry supply process, thereby dynamically outputting slurries with different performances, making it fully match the formation, and overcoming the problems of mismatch or even slurry performance failure caused by the prefabricated slurry facing the complex and changeable formation environment. Description of the drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 It is the structure diagram of the first transfer bin of the present invention.

[0041] Figure 2 It is the schematic diagram of the transfer system structure of the present invention.

[0042] Figure 3 is Figure 2Another schematic diagram of the visual structure.

[0043] Figure 4 is Figure 3 An enlarged view of the structure of area A in

[0044] Figure 5 is Figure 3 An enlarged view of the structure of area B in

[0045] In the figure: 1 - First transfer bin; 2 - Primary slurry inlet pipe; 3 - First transfer pump; 4 - Primary slurry outlet pipe; 5 - Quality inspection unit; 6 - Slurry transfer valve; 7 - Waste slurry valve; 8 - Primary slurry supply pipe; 9 - Waste slurry pipe; 10 - Second transfer bin; 11 - Stirring mechanism; 12 - Equalizing pipe; 13 - Third transfer bin; 14 - Circulation pump; 15 - Injection pipe; 16 - Reagent tank; 17 - Shut-off valve; 18 - Second transfer pump; 19 - Secondary slurry outlet pipe; 20 - Return slurry pipe; 21 - Cyclone vibrating sieve. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0048] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0049] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0050] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" appear, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0051] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", and "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0052] Embodiment 1:

[0053] This embodiment mainly elaborates on the content of the fixed-wall slurry transfer system provided by the present invention. Specifically, for the structure of the transfer system, refer to the attached Figures 1 - 5 As shown, the fixed-wall slurry transfer system is characterized in that it includes a temporary storage unit. The temporary storage unit includes a first transfer bin 1 for classifying and temporarily storing fixed-wall slurries with different properties and being connected in sequence, a diversion mechanism, a second transfer bin 10, a pressure equalizing pipe 12, and a third transfer bin 13; a hydrocyclone vibrating screen 21 for filtering and screening the formation return slurry is provided on the first transfer bin 1, and the slurry storage part of the hydrocyclone vibrating screen 21 is communicated with the first transfer bin 1;

[0054] A preparation unit, the preparation unit includes a data module for storing the mapping relationship data between different agent ratios and different performance parameters of the base slurry; a dosing mechanism for adding agents to the second transfer bin 10 and / or the third transfer bin 13; and a first detection mechanism and a second detection mechanism respectively installed in the second transfer bin 10 and the third transfer bin 13 for collection; a temperature control mechanism for adjusting the mud temperature is also installed in the second transfer bin 10 and the third transfer bin 13;

[0055] A stirring mechanism, a plurality of paddle agitators respectively installed in the first transfer bin 1, the second transfer bin 10, and the third transfer bin 13 for stirring the slurry;

[0056] An information processing unit, the information processing unit calculates the types and quantities of agents that need to be added between the current slurry and the target slurry by calling the mapping relationship data in the data module, and sends a dosing instruction to the dosing mechanism until the current slurry is prepared into the target slurry.

[0057] Principle description:

[0058] Regarding the temporary storage of the slurry for protecting the trench wall, the slurry for protecting the trench wall is a key medium used for perfusion into the trench during the geological trench excavation stage to protect the trench wall, resist the formation pressure, and prevent the occurrence of cave-ins. The slurry for protecting the trench wall is also called the slurry for protecting the trench wall or mud. Different name expressions in this field will not cause ambiguity and all refer to the flowable medium used for compression resistance and trench wall protection during trench excavation. As the most basic function of the mud transfer system is to temporarily store the mud and timely transport it into the formation during the construction process. In this embodiment, there are three transfer bins for temporarily storing the slurry for protecting the trench wall, namely the first transfer bin 1, the second transfer bin 10, and the third transfer bin 13. Among them, the first transfer bin 1 is mainly used for temporarily storing the returned slurry. Since the quality of the returned slurry from the formation varies according to the formation conditions, there may be too much moisture resulting in unqualified density and viscosity, or there may be flocculants resulting in unqualified density and viscosity. However, in any case, as long as it is the returned slurry, there will be a large amount of sediment entrained. Therefore, the returned slurry needs to be filtered by the hydrocyclone vibrating screen 21 provided on the first transfer bin 1 before entering the first transfer bin 1, and then sent into the first transfer bin 1 for temporary storage.

[0059] As the amount of the recovered slurry increases, the recovered slurry needs to be reused. However, since the properties of the returned slurry are very likely not to meet the requirements of the construction formation, it is essential to detect and adjust the returned slurry. See the appendix Figure 3 and Figure 5As shown in the figure, for the return slurry to enter the second transfer bin 10 from the first transfer bin 1, it needs to pass through the primary slurry inlet pipe 2, the first transfer pump 3, the primary slurry outlet pipe 4, and the quality detection unit 5 in sequence. When passing through the quality detection unit 5, the quality detection unit 5 performs real-time detection on the density of the return slurry flowing through it and sends it to the information processing unit. If the density meets the system recovery threshold range, then the information processing unit sends an opening instruction to the slurry transfer valve 6, and the waste slurry valve 7 is in a closed state; enabling the return slurry to pass through the slurry transfer valve 6 and the primary slurry delivery pipe 8 in sequence and enter the second transfer bin 10 for temporary storage, awaiting further processing; conversely, if the density of the return slurry detected by the quality detection unit 5 does not meet the recovery density requirement, then the slurry transfer valve 6 is closed and the waste slurry valve 7 is opened, so that the non-compliant return slurry cannot directly enter the transfer system for reuse. Temporary waste slurry is required, and after being processed through other modulation processes, it is injected into the transfer system to participate in the recycling. The quality detection unit 5 can be flexibly set according to the requirements of the actual construction project. For example, for projects with higher requirements for return slurry recovery, the quality detection unit 5 can simultaneously detect parameters such as the density, viscosity, and sand content of the return slurry. As long as one parameter fails, then the return slurry is not allowed to enter the transfer system for reuse; only the return slurry that passes all the detections is allowed to be reused; for projects with lower requirements for the quality of the return slurry, then a single core index can also be detected, such as only detecting the density or specific gravity or viscosity. As long as it meets the preset return slurry requirements of the system, it can enter the transfer system for reuse.

[0060] The slurry in the second transfer bin 10 will be preliminarily modulated. The goal is to modulate the performance index of the returned slurry to the performance of the prefabricated basic slurry. It is worth noting that the basic slurry mentioned here refers to the slurry directly used in construction prepared by the pulp preparation station in the prior art. The performance of the basic slurry can meet the requirements of most construction scenarios, but for complex and variable formation environments, there will be problems of mismatch, or even failure and hole collapse. Modulating the returned slurry into the performance of the basic slurry is to lay a foundation for further modulating the slurry for wall protection in the third transfer bin 13. Because only a stable basic slurry as the modulation basis can obtain better accuracy and slurry performance more suitable for the current special formation, so as to meet the requirements of dynamic modulation and slurry delivery. The second transfer bin 10 is connected to the third transfer bin 13 through the pressure equalizing pipe 12. A shut-off valve and a driving pump are provided on the pressure equalizing pipe 12 for realizing the slurry modulation between different transfer bins.

[0061] The third transfer warehouse 13 serves as the main structure for dynamic mud modulation and supply. The process and principle of dynamically supplying and modulating mud are as follows: The information processing unit calculates the types and quantities of agents to be added between the current slurry and the target slurry by invoking the mapping relationship data in the data module, and sends a dosing instruction to the dosing mechanism until the current slurry is formulated into the target slurry. Since the mapping relationship data can directly obtain the impact of adding a certain type of additive to the current base slurry on the properties of the wall-building slurry, for example, adding bentonite or xanthan gum will cause an increase in the viscosity and density of the base slurry; conversely, adding water will cause a decrease in both the viscosity and density of the base slurry. Since the types of additives stored in the dosing mechanism in the transfer system are known, and the mapping relationship between the weight ratio (i.e., the addition amount) of the added additive and the expected indicators such as the viscosity and density of the slurry after addition is also known, it is possible to quickly obtain the wall-building slurry within any modifiable range based on the mapping data, thus realizing the dynamic modulation and supply of the wall-building slurry. Of course, to ensure the accuracy of the parameters, during the adjustment process, at least one or more stirring mechanisms installed on each transfer warehouse are required to continuously stir the wall-building slurry. For the third transfer warehouse 13, the modulation uniformity of the slurry is very important. Therefore, in addition to the conventional stirring provided by the stirring mechanism 11, a circulation pump 14 is specially provided. Through the powerful jet power provided by the circulation pump 14, the wall-building slurry is disturbed without dead angles including horizontally, longitudinally, and obliquely by the slurry injection pipe 15, making the mixing degree of the wall-building slurry better and more uniform. The dosing mechanism controls the actuators including the shut-off valve 17 and the metering conveying mechanism through the information processing unit, and supplies the additives contained in any one or more reagent tanks 16 to the third transfer warehouse 13 to modulate the current wall-building slurry. It should be noted that the above modulation process is not a one-time operation. Due to mechanical cooperation errors or control errors, a single modulation may not achieve the expected ideal effect. Therefore, to ensure that the performance parameters of the wall-building slurry transported to the formation meet the requirements of the current formation, so as to maximize the satisfaction of construction needs and form a complete match with the current formation, after the modulation is completed and before being transported to the formation, it is still necessary to detect the wall-building slurry after modulation through the second detection mechanism. After meeting the preset value requirements, the modulated wall-building slurry is transported to the designated formation through the second transfer pump 19 and the secondary slurry outlet pipe 19 as shown in Figure 2 The second transfer pump 19 and the secondary slurry outlet pipe 19 in

[0062] In this embodiment, the mapping relationship data of the data module includes the mapping relationship data between the viscosity value μ of the wall-building slurry and the temperature T, the mapping relationship data between the viscosity value μ of the wall-building slurry and the additive ratio, and the mapping relationship data between the filtration volume V of the wall-building slurry and the additive ratio.

[0063] In this embodiment, the mapping relationship between the viscosity value μ of the solid wall slurry, the temperature T, and the additive proportion is calculated by the following formula

[0064]

[0065] where T0 is the reference temperature / ambient temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient, n represents the number of different types of additives considered in the model, W i represents the weight factor, W i > 0 indicates thickening, W i <0 indicates viscosity reduction; C i represents the mass percentage concentration of the i-th additive in the water-based slurry.

[0066] In this embodiment, the mapping relationship between the filtration loss volume V of the solid wall slurry and the additive proportion is calculated by the following formula

[0067]

[0068] where T represents the current temperature, k0 is the reference dynamic filtration coefficient; β is the temperature sensitivity coefficient, obtained by fitting through actual experiments in the dynamic filtration instrument; γ i represents the additive inhibition efficiency, the unit concentration inhibition efficiency of the i-th filtration loss reducer on the filtration loss amount, in units of %-1; D i is the mass percentage concentration of the i-th filtration loss reducer in the slurry; n represents the time exponent, that is, the power-law exponent of the relationship between the filtration loss volume and time t under dynamic conditions; m represents the types of additives. Both the first detection mechanism and the second detection mechanism include a viscosity sensor, a density sensor, a temperature sensor, and a pH value sensor.

[0069] Example 2:

[0070] This embodiment also provides a method for preparing a solid wall slurry, which is prepared by using the above-mentioned transfer system for the solid wall slurry, and specifically includes the following steps:

[0071] Step STP100, use the first detection mechanism arranged in the second transfer bin 10 to detect and collect the viscosity value μ0 of the preset slurry obtained under the condition of the ambient temperature T0 based on the preset formula; and establish an exponential decay model μ(T) between the viscosity μ of the preset slurry and the temperature T:

[0072]

[0073] where T0 is the ambient temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient;

[0074] Step STP200, based on the formula of the wall-fixing slurry in step STP100, a control variable method is used to traverse different proportions of a single additive under the condition of normal temperature T0-T to obtain a modulated slurry, and the viscosity value μ of the modulated slurry is collected again by the first detection mechanism and recorded;

[0075] Step STP300, repeat steps STP100 to STP200 by changing the type of additive until all additives in the dosing mechanism are traversed and the mapping data of different additives under normal temperature T0-T are recorded; based on the exponential decay model μ(T) established in step STP100, a modified exponential decay model μ′(T) is further established to integrate the influence of different additive proportions on the viscosity value μ of the modulated slurry:

[0076]

[0077] Where n represents the number of different additive types considered in the model, and W i Represents the weight factor, W i >0 means thickening, W i <0 means viscosity reduction; C i represents the mass percentage concentration of the ith additive in the water-based slurry;

[0078] Step STP400, by manually setting the target slurry viscosity or by using a third detection mechanism set in the formation to detect the formation environment in real time and send it to the information processing unit, the information processing unit calculates the target slurry viscosity required for the current formation environment according to the exponential decay model μ′(T), calculates the type and amount of the agent to be added by calculating the difference between the viscosity value of the wall-fixing slurry in the third transfer bin (13) and the target slurry, and sends a drug adding instruction to the drug adding mechanism until the current wall-fixing slurry is prepared into the target slurry.

[0079] In order to further improve the compatibility between the wall-fixing slurry and the formation environment, preferably, a step of modulating the anti-filtration property of the wall-fixing slurry is also included, which is specifically as follows:

[0080] Step STP500, establishing a correlation model V(T,γ) between the current solid wall slurry filtration loss volume V and the additive ratio,

[0081]

[0082] Where T represents the current temperature, k0 is the benchmark dynamic filtration coefficient; β is the temperature sensitivity coefficient, which is obtained through actual experimental fitting in the dynamic filtration instrument; γ i represents the inhibitory efficiency of additives, the unit concentration inhibitory efficiency of the ith fluid loss reducer on fluid loss, unit %-1; D iThe mass percentage concentration of the i-th fluid loss reducer in the slurry; n represents the time exponent, i.e., the power-law exponent of the relationship between the fluid loss volume and time t under dynamic conditions; m represents the type of additive;

[0083] Step STP600, determine whether the current hole-stabilizing mud meets the fluid loss resistance requirements of the current formation by calculating V; if the volume difference ΔV is positive or greater than a preset value, it is necessary to calculate the type and quantity of additives to be added to the current hole-stabilizing slurry according to the associated model in step STP500, so that the expected fluid loss volume V′ of the modulated hole-stabilizing slurry is 85% of V;

[0084] Step STP700, continuously detect whether the fluid loss resistance of the modulated hole-stabilizing slurry meets the requirements of the current formation. If the volume difference ΔV is still positive or greater than the preset value, repeat step STP600. If the volume difference ΔV is negative or less than the preset value, continuously monitor until the construction is completed.

[0085] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A solid wall slurry transfer system, characterized in that: It includes a temporary storage unit, which includes a first transfer bin (1) for hierarchically storing solid wall slurries with different performances and being connected in sequence, a shunt mechanism, a second transfer bin (10), a pressure equalizing pipe (12) and a third transfer bin (13); a hydrocyclone vibrating sieve (21) for filtering and screening the formation return slurry is arranged on the first transfer bin (1), and the slurry storage part of the hydrocyclone vibrating sieve (21) is communicated with the first transfer bin (1). A dispensing unit, which includes a data module for storing mapping relation data between different agent ratios and different performance parameters of the base slurry. A chemical adding mechanism for adding chemicals to the second transfer bin (10) and / or the third transfer bin (13). And a first detection mechanism and a second detection mechanism respectively installed in the second transfer bin (10) and the third transfer bin (13) for collection; a temperature control mechanism for adjusting the mud temperature is also installed in the second transfer bin (10) and the third transfer bin (13). A stirring mechanism, which includes a plurality of paddle stirrers respectively installed in the first transfer bin (1), the second transfer bin (10) and the third transfer bin (13) for stirring the slurry. An information processing unit, which calculates the types and quantities of chemicals to be added between the current slurry and the target slurry by calling the mapping relation data in the data module, and sends a chemical adding instruction to the chemical adding mechanism until the current slurry is dispensed into the target slurry.

2. The fixed-wall slurry transfer system according to claim 1, characterized in that: The mapping relation data of the data module includes the mapping relation data between the viscosity value μ of the solid wall slurry and the temperature T, the mapping relation data between the viscosity value μ of the solid wall slurry and the additive ratio, and the mapping relation data between the filtration loss volume V of the solid wall slurry and the additive ratio.

3. The fixed-wall slurry transfer system according to claim 2, wherein: The mapping relation between the viscosity value μ of the solid wall slurry and the temperature T and the additive ratio is calculated by the following formula Among them, T0 is the reference temperature / room temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient; n represents the number of different types of additives considered in the model, W i represents the weight factor, W i > 0 indicates thickening, W i < 0 indicates viscosity reduction; C i represents the mass percentage concentration of the i-th additive in the water-based slurry.

4. The fixed-wall slurry transfer system according to claim 2, wherein: The mapping relation between the filtration loss volume V of the solid wall slurry and the additive ratio is calculated by the following formula Where, T represents the current temperature, k0 is the reference dynamic filtration loss coefficient; β is the temperature sensitivity coefficient, obtained by fitting through actual experiments in the dynamic filtration loss instrument; γ i represents the additive inhibition efficiency, the inhibition efficiency per unit concentration of the filtration loss amount by the i-th filtration loss reducer, unit %-1; D i is the mass percentage concentration of the i-th filtration loss reducer in the slurry; n represents the time exponent, that is, the power-law exponent of the relationship between the filtration loss volume and time t under dynamic conditions; m represents the type of additive.

5. The fixed-wall slurry transfer system according to any one of claims 1-4, characterized in that: Both the first detection mechanism and the second detection mechanism include a viscosity sensor, a density sensor, a temperature sensor and a pH value sensor.

6. Method for preparing solid-wall slurry, characterized in that, The modulation is completed by using the solid wall slurry transfer system according to any one of claims 1-5, which specifically includes the following steps Step STP100, using the first detection mechanism arranged in the second transfer bin (10) to detect and collect the viscosity value μ0 of the preset slurry obtained under the condition of the preset formula at the normal temperature T0; and establishing an exponential decay model μ(T) between the preset slurry viscosity μ and the temperature T Wherein, T0 is the normal temperature, with a value of 20 °C; μ0 is the initial viscosity under the condition of the reference temperature T0; α is the temperature sensitivity coefficient. Step STP200, on the basis of the formula of the solid wall slurry in step STP100, using the control variable method to traverse different ratios of a single additive to configure the modulation slurry under the condition of the normal temperature T0-T, and then collecting the viscosity value μ of the modulation slurry through the first detection mechanism again and recording it. Step STP300: Replace the type of additive and repeat Steps STP100 - STP200 until all additives in the chemical dosing mechanism are traversed and the mapping data of different additives under normal temperature T0 - T are recorded; based on the exponential decay model μ(T) established in Step STP100, further establish a modified exponential decay model μ′(T) that incorporates the influence of the proportion of different additives on the viscosity value μ of the modulated slurry: where n represents the number of different types of additives considered in the model, and W i represents the weighting factor, W i > 0 indicates thickening, and W i < 0 indicates viscosity reduction; C i represents the mass percentage concentration of the i-th additive in the water-based slurry; Step STP400: Manually specify the target slurry viscosity or have the third detection mechanism set in the formation detect the formation environment in real - time and send it to the information processing unit. The information processing unit calculates the target slurry viscosity required for the current formation environment according to the exponential decay model μ′(T), calculates the type and quantity of chemicals to be added by calculating the difference between the viscosity value of the solid - walling slurry in the third transfer bin (13) and the target slurry viscosity value, and sends a chemical dosing instruction to the chemical dosing mechanism until the current solid - walling slurry is formulated into the target slurry.

7. The method for preparing the solid wall slurry according to claim 6, characterized in that: It also includes the modulation steps for the fluid - loss resistance of the solid - walling slurry, specifically as follows: Step STP500: Establish a correlation model V(T,γ) between the fluid - loss volume V of the current solid - walling slurry and the additive proportion. Where, T represents the current temperature, k0 is the reference dynamic filtration loss coefficient; β is the temperature sensitivity coefficient, obtained by fitting through actual experiments in the dynamic filtration loss instrument; γ i represents the additive inhibition efficiency, the inhibition efficiency per unit concentration of the filtration loss amount by the i-th filtration loss reducer, unit %-1; D i is the mass percentage concentration of the i-th filtration loss reducer in the slurry; n represents the time exponent, that is, the power-law exponent of the relationship between the filtration loss volume and time t under dynamic conditions; m represents the type of additive; Step STP600: Determine whether the current solid - walling mud meets the fluid - loss resistance requirements of the current formation by calculating V; if the volume difference ΔV is positive or greater than the preset value, the type and quantity of additives to be added to the current solid - walling slurry need to be calculated according to the correlation model in Step STP500 so that the expected fluid - loss volume V′ of the modulated solid - walling slurry is 85%V. Step STP700: Continuously detect whether the fluid - loss resistance of the modulated solid - walling slurry meets the requirements of the current formation. If the volume difference ΔV is still positive or greater than the preset value, repeat Step STP600; if the volume difference ΔV is negative or less than the preset value, continuously monitor until the construction is completed.

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