A small-aperture double-liquid slurry mixer

Abstract

The present application discloses a small-aperture dual-liquid slurry mixer, including an outer shell, a reverse valve fixedly arranged in the outer shell for dividing the inner cavity of the outer shell into an independent and closed first channel and a second channel, the reverse valve having a valve core for unidirectionally conducting the first channel, the first channel and the second channel being connected through a mixing chamber arranged at the rear of the outer shell, the mixing chamber having an expanded structure and an axial cross-section gradually converging along the fluid flow direction. The present application is fixed by a hydraulic plug, which can fix the mixer at a specified depth segment, making the dual-slurry plugging of water more targeted and accurate. The mixer mixes cement slurry and water glass slurry near the target area, which can simultaneously solve the problems of pipe blockage caused by premature solidification and uneven mixing in the dual-slurry hole, and specifically solve the industry pain points and technical difficulties in the dual-slurry perfusion plugging technology.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy geological treatment, in particular to the field of tools required for geological grouting drilling, and specifically to a small-aperture double-liquid slurry mixer. Background Art

[0002] Before grouting the target area, it is necessary to drill a hole for the slurry to enter the channel during the subsequent grouting operation. During the drilling process, due to different geological environments, water gushing, hole collapse and other phenomena may occur. In particular, water gushing during the drilling process is greatly detrimental to the drilling work. If the water gushing problem is not effectively controlled and solved, it is almost impossible to reach the preset drilling depth, and even cause underground hole collapse. In order to avoid the problem of being unable to continue drilling due to water gushing during the drilling process, the existing technology often uses mud and weighted mud to cooperate with drilling construction, so that the underground pressure can be balanced. At the same time, the mud can form a wall protection during the drilling process, avoiding the expansion of water gushing and hole collapse problems. However, when encountering severe water gushing conditions, conventional mud can no longer read the water gushing to achieve blocking, and it is necessary to cooperate with water glass slurry and cement slurry to block water gushing under the hole, thereby avoiding hole collapse and enabling drilling to continue to the specified depth.

[0003] However, in order to achieve plugging under conditions of large water gushing, it is necessary to deliver water glass slurry and cement slurry to a specified depth in a specified ratio in order to effectively plug the water gushing. This requires a tool that can accurately mix the water glass solution and cement slurry in a hole at a specified depth.

[0004] Prior art 1: A Chinese patent with announcement number CN205314085U discloses a dual-liquid grouting system for cement and water glass solution, including pipe A, pipe B and pipe C; pipe A is a sleeve valve pipe for injecting cement slurry; pipe B is used to inject water glass, and pipe C is used to inject casing material slurry. This technology has a simple structure and is only suitable for drilling plugging at a shallow depth, and it cannot achieve precise control for water plugging at a specified depth.

[0005] Prior art 2: The invention patent application with publication number CN106639973A discloses a grouting structure and a grouting method for double-liquid grouting of ultra-deep holes on the surface, which provides a double-liquid grouting structure. The basic principle adopted is to send cement slurry and water glass slurry to the hole of the specified depth separately, and then use a blocker to define a section of the hole space as a mixing chamber, and send the independent cement slurry and water glass slurry to the mixing chamber to achieve mixing. Although prior art 2 is more scientific than prior art 1 and can reach a greater depth, its disadvantages are also very obvious, mainly reflected in: First, mixing in the hole, due to the presence of various slurry impurities in the hole, the water glass slurry and cement slurry artificially sent in cannot be mixed according to the preset ratio. Second, the use of natural mixing in the hole space does not guarantee the uniformity control mechanism of double slurry mixing, which can easily cause uneven mixing, thereby losing the advantage of double slurry perfusion. Summary of the invention

[0006] In order to solve the problems in the prior art of using water glass slurry and cement slurry to achieve water gushing plugging, such as easy clogging due to early mixing, inability to ensure uniformity of mixing after injection, shallow applicable depth, low control accuracy, and inability to achieve precise plugging of a specific depth segment, the present application provides a small-aperture dual-liquid slurry mixer, which can achieve precise slurry delivery in a specific depth segment, and immediately deliver the dual-liquid slurry to the target area after mixing using a preset dual-liquid ratio, solving the problems of easy solidification and clogging due to early mixing, and inability to control the mixing ratio and uniformity when mixing in the target area hole. The present application adopts the method of mixing the dual-liquid slurry in the mixer before delivering it to the target hole, and the mixing chamber provided inside the mixer can ensure that the dual-liquid slurry is fully and evenly mixed according to the preset ratio, and is immediately delivered to the specified depth segment of the target hole after mixing, so that all the mixed slurry is delivered to the specified depth segment hole, and the problem of water gushing plugging is solved in a targeted manner. The dual-liquid slurry mixer of the present application consumes less total slurry and has a good plugging effect. The expected sealing effect can be achieved by lowering the pipe once, solving the problem of water gushing from the borehole and fundamentally avoiding the occurrence of water gushing and borehole collapse.

[0007] In order to achieve the above purpose, the technical solution adopted in this application is:

[0008] A small-aperture dual-liquid slurry mixer comprises an outer shell, a reverse valve fixedly arranged in the outer shell for dividing the inner cavity of the outer shell into a first channel and a second channel which are independent and sealed, the reverse valve having a valve core for unidirectionally conducting the first channel, the first channel and the second channel being connected via a mixing chamber arranged at the rear of the outer shell, the mixing chamber having an expanded structure and an axial cross section which gradually converges along the fluid flow direction;

[0009] The inlet end of the first channel is connected to a cement slurry inlet pipe, and the outlet end is close to the mixing chamber and has a convergent axial cross-section along the fluid flow direction; the inlet end of the second channel is connected to a water glass slurry inlet pipe, and a wire drawing nozzle is provided at the outlet end, and the mixing chamber is connected to a mixed slurry outlet pipe.

[0010] Slurry mixing principle: Regarding the cement slurry conveying principle in the first channel, the cement slurry is pressurized by the slurry pump and then reaches the valve core position from the cement slurry inlet pipe and the reverse valve in sequence. Since the valve core has the function of blocking the entry of cement slurry, when the pressure of the cement slurry conveyed by the slurry pump is greater than the valve core pressure, it overcomes the resistance of the valve core and enters the valve core and then enters the mixing chamber. At the same time, water glass is pressurized by the slurry pump and conveyed to the water glass slurry inlet pipe, thereby entering the second channel, and finally the water glass is sent into the mixing chamber in a preset form through the wire drawing nozzle to mix with the cement slurry in the first channel. The wire drawing nozzle has the function of preventing backflow, avoiding the problem of cement slurry backflow into the wire drawing nozzle after the water glass pipeline stops pressurizing and causing the water glass pipeline to be blocked. Since the mixing chamber has an expanded structure, the flow rate can be reduced after the cement slurry enters the expanded structure to fully mix with the water glass slurry after wire drawing. Moreover, the mixing chamber is arranged in a convergent structure along the flow direction of the fluid, which further squeezes the mixed slurry, changes the mixed uniformity of the mixed slurry, and further improves the slurry mixing uniformity. After the double slurries are fully mixed in the mixing chamber, they enter the preset depth section in the hole through the mixed slurry outlet pipe to form a blockage for the hole wall of the water gushing hole section.

[0011] It is worth noting that the ratio of the double slurry mixing has nothing to do with the mixer provided in this application. The preset ratio is determined by the delivery flow rate of the delivery pump that provides cement slurry and water glass slurry respectively. Regarding the delivery depth, the cement slurry inlet pipe of the mixer provided in this application is connected to the drill pipe slurry delivery pipeline, and the double slurry can be mixed to a specified depth according to actual construction requirements, not limited to shallow surface mixing and slurry delivery. In order to improve stability, the mixer can also be fixed in conjunction with the existing hydraulic plug pipe, so that the effect of precise blocking can be better exerted.

[0012] As a preferred setting scheme of the present application, the first channel is composed of a cement slurry inlet pipe, a valve core and a grouting pipe connected to the mixing chamber, which are connected in sequence. The valve core includes a high-pressure spring and a steel ball that contacts the high-pressure spring to prevent the reflux of cement slurry. The interior of the grouting pipe gradually converges along the flow direction of the cement slurry and the critical surface intersecting with the mixing chamber is the minimum cross section. The purpose of using a spherical steel ball as a valve core component is to provide reliable sealing and prevent reflux in cement slurry containing granular impurities. The steel ball seal is a line seal that can naturally avoid particulate matter in the cement slurry. Compared with a one-way valve with a surface seal, it has better practicality and environmental adaptability. The purpose of setting a grouting pipe with a convergent internal channel is to accelerate the cement slurry when it flows in the grouting pipe. The cross section of the cement slurry is the smallest when it leaves the grouting pipe. At this time, the flow rate of the cement slurry is the fastest. When it enters the mixing chamber at the maximum speed, a local negative pressure can be formed, which will instantly suck in the water glass slurry on the side to form a local vortex. This internal vortex is similar to the Venturi effect and can play a positive role in promoting the full mixing of water glass slurry and cement slurry. After the vortex, since the mixing chamber is enlarged compared to the grouting pipe, it will quickly decelerate, forming a limited turbulence effect in the mixing chamber. Combined with the mixing chamber with a convergent setting at the tail section, the slurry is further mixed more evenly.

[0013] In order to further optimize the structural setting, preferably, the outer shell includes a first shell segment and a second shell segment, and the first shell segment and the second shell segment are connected by a detachable and fixed connecting sleeve, and the connecting sleeve has a plurality of through holes connecting the first shell segment and the second shell segment, and the wire drawing nozzle is provided at one end of any of the through holes near the mixing chamber; the second channel is composed of an annular space formed between the inner wall of the first shell segment and the outer wall of the first channel, and a plurality of the through holes; the first channel and the second channel intersect in a mixing chamber arranged in the second shell segment.

[0014] In order to further improve the mixing efficiency of the mixer, preferably, the second shell section is located on the tube wall downstream of the mixing chamber and is alternately provided with multiple groups of spiral guides along the direction of fluid flow, and the guiding directions of two adjacent groups of spiral guides are opposite. After the double slurries are mixed in the mixing chamber, when they flow through the downstream tube wall, due to contact with the spiral guides, under the guiding action of the spiral guides, the mixed double slurries will flow along the guides; however, because there are multiple groups of spiral guides, and the guiding directions between the two adjacent groups are opposite, that is, the former group of spiral guides are guided clockwise, and the latter group of spiral guides are guided counterclockwise, and so on. Then, when the mixed slurry flows, it repeats the cycle of forward flow → turbulent flow → reverse flow → turbulent flow → forward flow. After multiple cycles, the mixed slurry will be mixed more evenly.

[0015] In order to achieve a better mixing effect and simplify the structural setting, preferably, any group of the spiral guides is composed of at least three spiral blades located at the same axial position and evenly distributed on the inner wall of the second shell segment. The guiding direction of any spiral blade in the same group is the same, and each spiral blade is fixedly arranged on the pipe wall. There is no movable component, the structure is compact, simple and reliable.

[0016] In order to achieve targeted and accurate delivery of the dual-liquid mixed slurry to a hole of a specified depth, on the basis of the above structure, it is preferably also included a water pressure plug for fixing the dual-liquid slurry mixer, wherein a mixed slurry inlet pipe is penetrated by the water pressure plug and is detachably fixedly connected to the mixed slurry outlet pipe through a thread connector; a pair of fixed joints fixed and relatively arranged on the circumferential side walls of the mixed slurry inlet pipe, a rubber tube connecting the two fixed joints, and a water pressure plug tube arranged on any one of the fixed joints for connecting the space between the inner wall of the rubber tube and the outer wall of the mixed slurry inlet pipe.

[0017] Preferably, the fixed joint that is not provided with a hydraulic plug tube is replaced with a movable joint that is fixedly connected to the rubber tube, and the movable joint is slidably and tightly connected to the outer side wall of the mixing slurry inlet pipe.

[0018] In order to meet the requirements of the movable structure to slide back and forth and achieve a better sealing effect, preferably, the inner wall of the movable joint is provided with a plurality of sealing rings that fit the mixed slurry inlet pipe. The method of providing the sealing ring can further reduce the surface roughness requirements and matching tolerance requirements between the inner diameter of the movable joint and the outer diameter of the mixed slurry inlet pipe, making the processing easier, and the subsequent maintenance more convenient, and the maintenance cost is lower and more convenient.

[0019] Beneficial effects:

[0020] The present application is fixed by a hydraulic plug, which can fix the mixer at a specified depth segment, making the double-slurry blocking of water gushing more targeted and accurate. The mixer mixes cement slurry and water glass slurry near the target area, which can simultaneously solve the problems of pipe blockage caused by premature solidification and uneven mixing in the double-slurry hole, and specifically solve the industry pain points and technical difficulties in the double-slurry perfusion and plugging technology. At the same time, the present application designs a unique double-slurry injection structure and mixing chamber structure based on the Venturi principle, which can achieve full mixing of the slurry. Furthermore, the present application also specially adds multiple sets of spiral guides, which can achieve multi-gradient mixing of the slurry to ensure that the output mixed slurry is uniform and sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a double-liquid slurry mixer for applying for a water-containing pressure plug;

[0023] Figure 2 yes Figure 1 An axial cross-sectional view of the mixer;

[0024] Figure 3 yes Figure 2 A magnified view of the structure of the middle A area (illustration of slurry mixing based on the Venturi principle);

[0025] Figure 4 yes Figure 2 A magnified view of the structure in the middle A area (another implementation structure);

[0026] Figure 5 yes Figure 2 A magnified view of the structure of the middle B area;

[0027] Figure 6 yes Figure 1 Axial cross-sectional view of the water pressure plug;

[0028] Figure 7 It is a structural schematic diagram of the water pressure plug in a fixed state;

[0029] Figure 8 It is a structural schematic diagram of Example 5;

[0030] Fig. 9 for Figure 8 Enlarged view of the structure of the middle C area.

[0031] In the figure: 1-outer shell; 2-hydraulic plug; 3-cement slurry inlet pipe; 4-water glass slurry inlet pipe; 5-hydraulic plug pipe; 6-reverse valve; 7-steel ball; 8-high pressure spring; 9-connecting sleeve; 10-through hole; 11-drawing nozzle; 12-mixing chamber; 13-wire connector; 14-mixed slurry inlet pipe; 15-fixed joint; 16-rubber tube; 17-sealing ring; 18-movable joint; 19-slit; 20-spherical one-way valve. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] 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 for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] Embodiment 1:

[0039] In conjunction with the instruction manual Figure 1-Figure 6 A small-aperture dual-liquid slurry mixer is shown, comprising an outer shell 1, a reversing valve 6 fixedly arranged in the outer shell 1 for dividing the inner cavity of the outer shell 1 into an independent and closed first channel and a second channel, the reversing valve 6 having a valve core for unidirectionally conducting the first channel, the first channel and the second channel being connected at the ends through a mixing chamber 12 arranged at the rear of the outer shell 1, the mixing chamber 12 having an expanded structure and an axial cross section that gradually converges along the fluid flow direction;

[0040] The inlet end of the first channel is connected to a cement slurry inlet pipe 3, and the outlet end is close to the mixing chamber 12 and the axial cross-section along the fluid flow direction is convergent; the inlet end of the second channel is connected to a water glass slurry inlet pipe 4, and the outlet end is provided with a wire drawing nozzle 11, and the mixing chamber 12 is connected to a mixed slurry outlet pipe.

[0041] Slurry mixing principle: Regarding the cement slurry transportation principle in the first channel, the cement slurry is pressurized by the slurry pump and then reaches the valve core position from the cement slurry inlet pipe 3 and the reverse valve 6 in sequence. Since the valve core has the function of blocking the entry of cement slurry, when the pressure of the cement slurry delivered by the slurry pump is greater than the valve core pressure, it overcomes the resistance of the valve core and enters the valve core and then enters the mixing chamber 12. At the same time, water glass is pressurized by the slurry pump and transported to the water glass slurry inlet pipe 4, thereby entering the second channel, and finally the water glass is sent into the mixing chamber 12 in a preset form through the wire drawing nozzle 11 to mix with the cement slurry in the first channel. Since the mixing chamber 12 has an expanded structure, the flow rate of the cement slurry can be reduced after entering the expanded structure to fully mix with the water glass slurry after wire drawing. Moreover, the mixing chamber 12 is arranged in a convergent structure along the flow direction of the fluid, which further squeezes the mixed slurry, changes the mixed uniformity of the mixed slurry, and further improves the slurry mixing uniformity. After the double slurries are fully mixed in the mixing chamber 12, they enter the preset depth section in the hole through the mixed slurry outlet pipe to form a plug for the hole wall of the water gushing hole section.

[0042] It is worth noting that the ratio of the double slurry mixing has nothing to do with the mixer provided in this application. The preset ratio is determined by the delivery flow rate of the delivery pumps that provide cement slurry and water glass slurry respectively. According to the requirements of cement-water glass double slurry perfusion, the general cement slurry perfusion flow rate is 60L / min, and the water glass slurry flow rate is about 15% of the cement slurry, that is, the flow rate is 12L / min. According to the pipeline flow calculation formula, considering the relationship between liquid flow rate and viscosity, the calculation formula is:

[0043] Q=πd 4 ρgP / (128μL)

[0044] Where: Q-flow rate, L / min; d-pipe diameter, m; π-circumference ratio; ρ-fluid density / kg / m 3;

[0045] g-gravitational acceleration, 9.8N / kg; P-pressure difference between the two ends of the pipeline / MPa; μ-fluid viscosity / Pa·s; L-pipeline length / m.

[0046] Substituting the quantities in the formula into the calculation, the number of designed nozzles is 64, Q is 3L / min, π is 3.14, ρ is 1.373kg / m3, P is 3MPa, μ is 1.8Pa·s, and L is 15 meters. The nozzle diameter d=1.504mm is calculated, and the nozzle diameter d=1.6mm is selected for practical use. Admittedly, the above data are the preferred data parameters obtained by the applicant after actual use and verification in practice. The contents listed in this embodiment are only to illustrate the authenticity and reliability of the above data, and do not exclude the existence of other preferred parameter ratio schemes.

[0047] Regarding the delivery depth, the cement slurry inlet pipe 3 of the mixer provided in the present application is connected to the drill pipe delivery pipeline, and can mix the two slurries to a specified depth according to actual construction requirements, not limited to mixing and delivering slurry in the shallow surface layer. In order to improve stability, the mixer can also be fixed with the existing hydraulic plug pipe, so that the effect of precise plugging can be better exerted.

[0048] Embodiment 2:

[0049] This embodiment is an optimized design solution, specifically based on the structure and principle of embodiment 1, further combined with Figure 2Therefore, the first channel is composed of a cement slurry inlet pipe 3, a valve core and a grouting pipe connected to the mixing chamber 12, which are connected in sequence. The valve core includes a high-pressure spring 8 and a steel ball 7 that abuts against the high-pressure spring 8 to prevent the grout from flowing back. The interior of the grouting pipe gradually converges along the flow direction of the cement slurry and the critical surface intersecting with the mixing chamber 12 is the minimum cross section. The purpose of using a spherical steel ball as a valve core component is to provide a reliable seal and prevent backflow in cement slurry containing granular impurities. The steel ball seal is a line seal that can naturally avoid particles in the cement slurry. Compared with a one-way valve with a surface seal, it has better practicality and environmental adaptability. The purpose of setting a grouting pipe with a convergent internal channel is to accelerate the cement slurry when it flows in the grouting pipe. The cross-section of the cement slurry is the smallest when it leaves the grouting pipe. At this time, the flow rate of the cement slurry is the fastest. When it enters the mixing chamber 12 at the maximum speed, a local negative pressure can be formed, which will instantly suck in the water glass slurry on the side to form a local vortex. This internal vortex is similar to the Venturi effect and can play a positive role in promoting the full mixing of the water glass slurry and the cement slurry. After the vortex, since the mixing chamber 12 is enlarged compared to the grouting pipe, it will quickly decelerate, forming a limited turbulence effect in the mixing chamber 12. Combined with the mixing chamber 12 with a convergent setting at the tail end, the slurry is further mixed more evenly. Specifically, Figure 3 Content shown.

[0050] Based on the above inventive concept, this embodiment also provides another structure, specifically as follows Figure 4 As shown, the grouting tube is also provided with a through hole inclined along the flow direction of the fluid. Since the cement slurry in the archery tube is faster and faster along the flow direction, according to the Venturi principle, the closer the through hole is to the end of the grouting tube, the easier it is for the water glass in the side space to enter the grouting tube and mix with the cement slurry. When the cement slurry and the water glass slurry are mixed, they are ejected together into the mixing chamber 12, and the process is repeated. Figure 3 The secondary mixing process shown makes the double-paddle mixing more complete.

[0051] In this embodiment, the outer shell 1 includes a first shell segment and a second shell segment, and the first shell segment and the second shell segment are connected by a detachable and fixed connecting sleeve 9, and the connecting sleeve 9 has a plurality of through holes 10 connecting the first shell segment and the second shell segment, and any of the through holes 10 is provided with the drawing nozzle 11 at one end close to the mixing chamber 12; the second channel is composed of an annular space formed between the inner wall of the first shell segment and the outer wall of the first channel and a plurality of the through holes 10; the first channel and the second channel intersect in the mixing chamber 12 provided in the second shell segment.

[0052] In order to further improve the mixing efficiency of the mixer, in this embodiment, a plurality of groups of spiral guides are alternately arranged on the pipe wall downstream of the mixing chamber 12 along the direction of fluid flow, and the guiding directions of two adjacent groups of spiral guides are opposite. After the double slurries are mixed in the mixing chamber 12, when they flow through the downstream pipe wall, due to the contact with the spiral guides, under the guiding action of the spiral guides, the mixed double slurries will flow along the guides; however, because there are multiple groups of spiral guides, and the guiding directions of two adjacent groups are opposite, that is, the first group of spiral guides are guided clockwise, and the second group of spiral guides are guided counterclockwise, and so on. Then, when the mixed slurry flows, it repeats the cycle of forward flow → turbulent flow → reverse flow → turbulent flow → forward flow, see Figure 5 As shown, Figure 5 The middle arrow indicates the spiral direction of the slurry flow. After multiple cycles, the mixed slurry will be mixed more evenly.

[0053] In order to achieve a better mixing effect and simplify the structural setting, any group of the spiral guides is composed of at least three spiral blades located at the same axial position and evenly distributed on the inner wall of the second shell segment. The guiding direction of any spiral blade in the same group is the same, and each spiral blade is fixedly set on the tube wall. There are no movable components, and the structure is compact, simple and reliable. It is worth noting that the more spiral blades there are, the greater the resistance, making the flow rate slower; the greater the radial length of the spiral blades, the closer to the center of the circle, the better the guiding and mixing effects, and the greater the resistance; vice versa. Since multiple groups of guides are used, in order to be compatible with the uniformity of mixing and the fluidity of the slurry, a single group of three blades is used, and the radial length of each blade is preferably one-fourth of the inner diameter of the tube wall.

[0054] In this embodiment, the mixed slurry will undergo at most three mixings, the first primary mixing being performed by Figure 4 The through hole provided on the slurry ejection pipe as shown in the figure is used for suction mixing according to the Venturi principle; the second mixing is carried out in the mixing chamber 12, as shown in FIG. Figure 3 As shown; the third mixing is through the spiral guide mixing, such as Figure 5 As shown, this can ensure the adequacy of the double-slurry mixing, ensure the effectiveness of water gushing plugging, and solve the problem of poor plugging or secondary water gushing.

[0055] Embodiment 3:

[0056] This embodiment is a preferred embodiment of the present application, which aims to achieve targeted and accurate delivery of the double-slurry mixed slurry to a hole of a specified depth. On the basis of the above structure, it also includes a water pressure plug 2 for fixing the double-liquid slurry mixer, such as Figure 6 and Figure 7As shown, the water pressure plug 2 is penetrated by a mixed slurry inlet pipe 14 which is detachably fixedly connected to the mixed slurry outlet pipe through a thread connector 13; a pair of fixed joints 15 fixedly and relatively arranged on the circumferential side walls of the mixed slurry inlet pipe 14, a rubber tube 16 connecting the two fixed joints 15, and a water pressure plug tube 5 arranged on any one of the fixed joints 15 for connecting the space between the inner wall of the rubber tube 16 and the outer wall of the mixed slurry inlet pipe 14.

[0057] Working principle: After the mixer is sent to the specified depth, the ground pressure equipment is used to transport clean water through the pipeline to the hydraulic plug pipe 5. As the amount of clean water injected increases, the rubber tube 16 is continuously expanded by force. Since the fixed structure 15 and the mixed slurry inlet pipe 14 are closed structures, the rubber tube 16 continues to expand and grow under the action of water pressure until it contacts the hole wall. Figure 7 As shown, at this time, as the rubber tube 16 continues to grow, the outer surface of the rubber tube 16 collides with the hole wall, forming a huge extrusion force, so that the rubber tube 16 and the hole wall are stationary due to the huge static friction, playing a fixing role. At this time, the slurry mixed by the mixer enters the hole of the specified depth section through the mixed slurry inlet pipe 14 to implement water gushing plugging. Due to the action of the hydraulic plug pipe 5, the hole is divided into two sections, as shown in the figure. Figure 7 As shown, when the lower section is plugged, the mixed slurry cannot enter the hole in the upper section, which achieves the pertinence and accuracy of the plugging. The above operation not only has obvious plugging technical effects, but also can minimize the amount of slurry consumed. When deep hole construction is required, if water gushing occurs in a porous section, one section can be constructed and blocked until the preset depth. The method of this embodiment can meet the existing drilling depths of various depths and various difficult and complex geological conditions.

[0058] Embodiment 4:

[0059] Based on Example 3, further optimization is performed, and the Figure 7 As shown, in this embodiment, the fixed joint 15 in Embodiment 3 which is not provided with the hydraulic plug tube 5 is replaced with a movable joint 18 fixedly connected to the rubber tube 16, and the movable joint 18 is slidably and tightly connected to the outer wall of the mixing slurry inlet pipe 14.

[0060] In order to meet the back and forth sliding requirements of the movable structure 18 and to achieve a better sealing effect, preferably, the inner side wall of the movable joint 18 is provided with a plurality of sealing rings 17 that fit the mixed slurry inlet pipe 14. The way of setting the sealing ring 17 can further reduce the surface roughness requirements and matching tolerance requirements between the inner diameter of the movable joint 18 and the outer diameter of the mixed slurry inlet pipe 14, making the processing easier, and the convenience of subsequent maintenance is higher, and the maintenance cost is lower and more convenient. The use of the movable joint 18 can significantly reduce the boost value in the hydraulic plug pipe 5 under the same fixing effect. Due to the use of the movable joint 18, when the rubber tube 16 is subjected to pressure, the rubber tube 16 will further shorten the axial length while expanding in the radial direction, which is more conducive to the deformation of the rubber tube 16, and greatly reduces the rubber tube 16 that cannot be shortened in the axial direction and can only expand in the radial direction. Due to the loose geology of the hole wall, the rubber tube 16 cannot be reliably abutted and tightened. In the continuous pressurization process, the pressure on the rubber tube 16 exceeds the expansion limit and bursts. When the fixed joint 15 is replaced with a movable joint 18, the rubber tube 16 of the same material and size can significantly increase the effective radial expansion range while shortening the axial length, which is more effective in dealing with loose geological conditions and avoids the problem of bursting due to excessive expansion. At the same time, after adopting the movable joint 18, the requirements for the ground boosting equipment are also significantly reduced, so that the requirements for the pipeline connecting the hydraulic plug pipe 5 are also reduced, the material cost investment is significantly reduced, and the service life is extended.

[0061] This embodiment is fixed by a hydraulic plug, which can fix the mixer at a specified depth segment, making the double-slurry plugging of water more targeted and accurate. The mixer mixes cement slurry and water glass slurry near the target area, which can simultaneously solve the problems of pipe blockage caused by premature solidification and uneven mixing in the double-slurry hole, and specifically solve the industry pain points and technical difficulties in the double-slurry perfusion plugging technology. At the same time, the present application designs a unique double-slurry injection structure and mixing chamber structure based on the Venturi principle, which can achieve full mixing of the slurry. Furthermore, the present application also specially adds multiple sets of spiral guides, which can achieve multi-gradient mixing of the slurry to ensure that the output mixed slurry is uniform and sufficient.

[0062] Embodiment 5:

[0063] This embodiment is a technical solution parallel to Embodiment 2, specifically as follows Figure 8 and Fig. 9As shown, the upper end of the connecting sleeve 9 is provided with a plurality of through holes 10, and the lower end is provided with an annular slit 19 connected to any through holes 10. The slit 19 can be concentrically arranged in multiple layers to meet different water glass flow requirements, but any layer of slits 19 are connected to the through holes 10 to discharge the water glass slurry into the mixing chamber 12. Compared with the drawing nozzle 11 in Example 2, the design of the slit 19 has the following advantages: first, on the same end face cross-sectional area of ​​the connecting sleeve 9, it can have a larger flow rate, avoiding the relatively limited maximum flow limit of the drawing nozzle 11; second, the design of the slit 19 can be micron-level, thereby preventing the backflow of cement slurry and causing the problem of condensation and blockage in the connecting sleeve 9. When the minimum spacing of the slit 19 is smaller than the particle size of the cement slurry particles, it can effectively block the backflow of cement slurry and avoid the occurrence of pipe blockage. When the above-mentioned small-pitch slit 19 design cannot meet the water glass slurry flow demand, the problem can be solved by increasing the number of slits 19 or expanding the spacing between slits 19; when the spacing between slits 19 is expanded to increase the water glass slurry flow, a spherical one-way valve 20 must be provided at the upper end of the connecting sleeve 9 to prevent the cement slurry from flowing downstream of the connecting sleeve 9 to avoid further pipe blockage. Of course, as a person skilled in the art, when using the dual-liquid slurry mixer described in this embodiment, the cement slurry booster pipeline must be turned off first, and then the water glass slurry booster pipeline must be turned off to further avoid the situation where the pressure of the cement slurry delivery pipeline is higher than the pressure of the water glass slurry delivery pipeline, which causes pipe blockage due to countercurrent mixing. In this way, a triple insurance is formed to avoid pipe blockage.

[0064] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. 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 small-aperture double-liquid slurry mixer, characterized in that: It comprises an outer shell (1), a reverse valve (6) fixedly arranged in the outer shell (1) and used for dividing the inner cavity of the outer shell (1) into an independent and sealed first channel and a second channel, the reverse valve (6) having a valve core for unidirectionally conducting the first channel, the first channel and the second channel being connected at the ends through a mixing chamber (12) arranged at the rear of the outer shell (1), the mixing chamber (12) having an expanded structure and an axial cross-section that gradually converges along the direction of fluid flow; the inlet end of the first channel is connected to a cement slurry inlet pipe (3), and the outlet end is close to the mixing chamber (12) and the axial cross-section along the direction of fluid flow is convergent; the inlet end of the second channel is connected to a water glass slurry inlet pipe (4), and the outlet end is provided with a wire drawing nozzle (11), and the mixing chamber (12) is connected to a mixed slurry outlet pipe; The first channel is composed of a cement slurry inlet pipe (3), a valve core and a grouting pipe connected to the mixing chamber (12) which are connected in sequence. The valve core includes a high-pressure spring (8) and a steel ball (7) which abuts against the high-pressure spring (8) to prevent the cement slurry from flowing back. The interior of the grouting pipe gradually converges along the cement slurry flow direction and the critical surface intersecting with the mixing chamber (12) is the minimum cross section. The side wall of the grouting pipe is provided with a plurality of through holes for absorbing water glass slurry. The outer shell (1) includes a first shell section and a second shell section. The first shell section is provided with a plurality of through holes for absorbing water glass slurry. The shell segment and the second shell segment are connected via a detachably fixed connection sleeve (9), wherein the connection sleeve (9) has a plurality of through holes (10) connecting the first shell segment and the second shell segment, and the wire drawing nozzle (11) is provided at one end of any of the through holes (10) close to the mixing chamber (12); the second channel is composed of an annular space formed between the inner wall of the first shell segment and the outer wall of the first channel and the plurality of the through holes (10); the first channel and the second channel intersect in the mixing chamber (12) provided in the second shell segment.

2. A small-aperture dual-liquid slurry mixer according to claim 1, characterized in that: A plurality of groups of spiral guides are alternately arranged on the tube wall of the second shell section located downstream of the mixing chamber (12) along the fluid flow direction, and the guiding directions of two adjacent groups of spiral guides are opposite.

3. A small-aperture dual-liquid slurry mixer according to claim 2, characterized in that: Any group of the spiral guides is composed of at least three spiral blades located at the same axial position and evenly distributed on the inner wall of the second shell segment.

4. A small-aperture dual-liquid slurry mixer according to any one of claims 1 to 3, characterized in that: It also includes a water pressure plug (2) for fixing the dual-liquid slurry mixer, wherein a mixed slurry inlet pipe (14) is provided through the water pressure plug (2) and is detachably fixedly connected to the mixed slurry outlet pipe via a threaded connector (13); a pair of fixed joints (15) fixedly and relatively arranged on the circumferential side walls of the mixed slurry inlet pipe (14), a rubber tube (16) connecting the two fixed joints (15), and a water pressure plug tube (5) provided on any one of the fixed joints (15) for connecting the space between the inner wall of the rubber tube (16) and the outer wall of the mixed slurry inlet pipe (14).

5. A small-aperture dual-liquid slurry mixer according to claim 4, characterized in that: The fixed joint (15) not provided with the hydraulic plug tube (5) is replaced with a movable joint (18) fixedly connected to the rubber tube (16); the movable joint (18) is slidably and tightly connected to the outer wall of the mixed slurry inlet pipe (14).

6. A small-aperture dual-liquid slurry mixer according to claim 5, characterized in that: The inner side wall of the movable joint (18) is provided with a plurality of sealing rings (17) that fit in contact with the mixed slurry inlet pipe (14).

7. The small-aperture dual-liquid slurry mixer according to claim 1, characterized in that: The outer shell (1) comprises a first shell segment and a second shell segment, the first shell segment and the second shell segment being connected via a detachably fixed connection sleeve (9), the connection sleeve (9) having a plurality of through holes (10) connecting the first shell segment and the second shell segment, and any of the through holes (10) is connected at one end close to the mixing chamber (12) via at least one annular slit (19); the upper end of the through hole (10) is detachably connected to a spherical one-way valve (20) for preventing backflow.

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