Preparation process of cement paste plugging material

Abstract

The invention discloses a preparation technology of a cement paste plugging material, and relates to the technical field of plugging cement preparation. The preparation technology of the cement paste plugging material in the prior art is optimized and improved, and a preparation system of the cement paste plugging material is matched with the technology. The cement paste plugging material is prepared in a multi-time mixing manner; the technical effects that the mixing efficiency is relatively high when the cement paste plugging material is prepared, and the uniformity of fibers in a finished product is relatively good are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of plugging cement preparation, and in particular to a preparation process of a cement slurry plugging material. Background Art

[0002] During the exploration and drilling process, adding leak-proof and plugging materials to cement slurry is the main method to improve (solve) the leakage problem at the drilling site. The most commonly used one is fiber leak-proof agent.

[0003] In the prior art, when preparing a leak-proof agent (cement slurry plugging material) containing fibers, since the fibers easily generate static electricity during friction, when mixing to prepare the cement slurry plugging material, the fibers added to the cement slurry plugging material are easy to agglomerate and difficult to separate, and it is difficult to evenly mix them into other materials, resulting in poor mixing efficiency, which ultimately limits the quality of the finished product. Summary of the invention

[0004] The embodiment of the present application provides a preparation process for a cement slurry plugging material, thereby solving the technical problems in the prior art of low mixing efficiency, poor mixing uniformity and a large amount of clumped fibers in the finished product, which ultimately leads to relatively poor quality of the finished product due to the presence of fibers when preparing fiber-containing cement slurry plugging materials. The embodiment of the present application achieves the technical effect of relatively high mixing efficiency and relatively good fiber uniformity in the finished product when preparing cement slurry plugging materials.

[0005] The embodiment of the present application provides a process for preparing a cement slurry plugging material, which includes a cement slurry plugging material preparation system including a mesh conveyor belt, a roller body, a mud pool, a scraper and a final mixing bin;

[0006] The preparation steps are as follows:

[0007] 1) Wetting the mesh conveyor belt;

[0008] 2) Outputting the fibers onto the moistened mesh conveyor belt, and blowing the fibers on the mesh conveyor belt evenly by blowing air;

[0009] 3) Rotate the wet mesh conveyor belt so that the fibers adhered thereto gradually fall onto the continuously rotating drum body; the drum body will adhere to the mixture of cement and water in the mud pool when rotating, and the fibers falling onto the drum body will adhere to the above mixture and form a new mixture;

[0010] 4) The mixture of cement, water and fiber adhered to the drum body is heated and solidified, and the water vapor and unfixed large fiber clumps generated by heating are sucked away by suction;

[0011] 5) scraping off the mixture adhering to the drum body with a scraper; cutting the mixture into slices and then sending them to the final mixing bin for dry mixing with other solid raw materials of cement slurry plugging materials;

[0012] 6) Add water and mix to form the finished product.

[0013] Furthermore, the cement slurry plugging material preparation system includes a bearing support frame that plays a supporting and positioning role, a fiber conveying assembly whose main body is a conveyor belt structure, a spray wetting assembly whose main body is an atomizing nozzle, a fiber output assembly located directly above the fiber conveying assembly, an air blowing and smoothing assembly that blows air toward the fiber conveying assembly, a dipping roller assembly, an air suction and de-agglomeration assembly, a conveying assembly for conveying the mixture on the inclined bearing platform to the final mixing bin, and a final mixing bin that is a container for a built-in stirring assembly;

[0014] The dipping drum assembly is a cylindrical drum structure as a whole, used for bonding cement slurry and fiber, including a drum body located below the fiber conveying assembly, a surface heating assembly positioned inside the drum body, a mud pool located directly below the drum body, and a mud replenishing assembly which is a combination of a mud pump and a conveying pipeline;

[0015] The air suction and de-agglomeration assembly comprises an air suction pipe and a filter screen;

[0016] The conveying assembly comprises an inclined bearing platform for guiding the cement separated from the roller body to move downward, a scraper closely attached to the roller body, a grid cutting knife and a crushed material conveying assembly.

[0017] Furthermore, the fiber conveying assembly includes a mesh conveyor belt, a driving wheel, a guide wheel, and a belt body vibration assembly;

[0018] The mesh conveyor belt is an annular belt body with a mesh structure, which is horizontally arranged and grounded, and is supported in an elongated shape by the driving wheel and the guide wheel;

[0019] The mesh conveyor belt is densely covered with limit strips, which are metal wires perpendicular to the mesh conveyor belt, with the bottom fixed on the mesh conveyor belt and a length of less than 1 cm, and are used to limit the movement of the fibers;

[0020] The driving wheel and the guide wheel are both cylindrical wheels, the driving wheel has a built-in motor, and both are closely attached to the mesh conveyor belt;

[0021] The guide wheel is closer to the dipping roller assembly relative to the driving wheel;

[0022] The belt body vibration assembly is a combination of a motor and a cam, which is arranged close to the mesh conveyor belt and the guide wheel. The cam rotates to impact the mesh conveyor belt to vibrate the mesh conveyor belt, so that the fibers adhered to the mesh conveyor belt fall off.

[0023] A heating unit is arranged inside the guide wheel, which is used to heat the surface of the guide wheel and then indirectly dry the fibers in contact with the mesh conveyor belt, so as to make the fibers adhering to the mesh conveyor belt fall down.

[0024] Furthermore, the fiber output component includes a silo and a quantitative discharging component;

[0025] The silo is a container for storing fibers, and the quantitative discharging assembly is used to output fibers to the mesh conveyor belt. Its main structure is a feeding auger and a shifting blade. The discharge port is long and strip-shaped, and the length direction of the discharge port is parallel to the axial direction of the mesh conveyor belt, and the length is less than the width of the mesh conveyor belt.

[0026] Furthermore, the grid cutting knife is a grid-shaped longitudinally arranged tube body, which is slidably positioned on the load-bearing support frame and cuts the mixture on the inclined load-bearing platform into sheets when it moves downward; a heating component is provided near the inclined load-bearing platform of the grid cutting knife for heating the grid cutting knife.

[0027] Preferably, the mud in the mud pool circulates under the action of the mud replenishing assembly.

[0028] Preferably, the scraper is rotatably connected to the inclined support platform under the drive of a motor, and the mixture is scraped off after the drum body rotates multiple times.

[0029] Preferably, the mesh conveyor belt is made of metal or conductive plastic.

[0030] Preferably, the dipping drum assembly comprises a central support rod, a rotating bearing ring, a tubular steel belt, an elastic side plate, a first cutting knife, a second cutting knife, a mud pool, a mud replenishing assembly and a deformation guide roller fixed to the central support rod by a bracket, and also comprises a heating plate fixed to the side wall of the central support rod by a bearing frame;

[0031] The central support rod is fixed on the load-bearing support frame;

[0032] There are two rotating bearing rings, which are circular rings sleeved on the central support rod;

[0033] The elastic side plate is a flat washer-shaped rubber elastic sheet, which is sleeved and fixed on the outer ring of the rotating bearing ring;

[0034] The tubular steel belt is a tubular belt body, and the edges are respectively fixed on the outer rings of the two elastic side plates;

[0035] The number of the deformation guide rollers is multiple, and they are closely attached to the inner wall of the tubular steel belt, supporting the tubular steel belt into a column with a cam-shaped longitudinal section;

[0036] The main bodies of the first cutting blade and the second cutting blade are both cylindrical and rotated under the drive of a motor; the first cutting blade is a cylinder with a plurality of annular sheets evenly distributed on the side wall; the second cutting blade is a cylinder with a plurality of strip sheets evenly distributed on the side wall, and the strip sheets are provided with a resistance heating wire or a resistance heating plate;

[0037] The conveying assembly comprises a crushed material conveying assembly, which conveys the mixture dropped from the dipping roller assembly to the final mixing bin for mixing.

[0038] Preferably, the discharge port is one to three centimeters away from the mesh conveyor belt.

[0039] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0040] By optimizing and improving the cement slurry plugging material preparation process in the prior art, and providing a cement slurry plugging material preparation system for the process, the cement slurry plugging material is prepared by multiple mixing methods; the technical problems in the prior art of low mixing efficiency, poor mixing uniformity and a large amount of clumped fibers in the finished product, which ultimately lead to relatively poor quality of the finished product, are solved due to the presence of fibers when preparing fiber-containing cement slurry plugging materials. The technical effect of relatively high mixing efficiency and relatively good fiber uniformity in the finished product is achieved when preparing cement slurry plugging materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A simplified structural diagram of a preparation device supporting the cement slurry plugging material preparation process of the present invention;

[0043] Figure 2 It is a schematic diagram of the structure of the grid cutting knife;

[0044] Figure 3 Schematic diagram of the positional relationship between the cement layer and the fiber layer;

[0045] Figure 4 A schematic diagram of the structure of the dipping roller assembly;

[0046] Figure 5 This is a schematic diagram of the appearance and structure of the dipping roller assembly;

[0047] Figure 6 is a schematic structural diagram of a first cutting knife;

[0048] Figure 7 It is a schematic diagram of the structure of the second cutting knife.

[0049] Icons: 001-cement layer; 002-fiber layer; 110-mesh conveyor belt; 111-limiting strip; 120-driving wheel; 130-guide wheel; 131-heating unit; 140-belt body vibration assembly; 200-spray wetting assembly; 300-fiber output assembly; 310-bin; 320-quantitative discharge assembly; 400-air blowing and smoothing assembly; 510-drum body; 520-surface heating assembly; 530-mud pool; 54 0-mud replenishing assembly; 550-center support rod; 551-rotating bearing ring; 560-tubular steel belt; 561-elastic side plate; 571-heating plate; 572-carrying frame; 580-deformation guide roller; 591-first cutting knife; 592-second cutting knife; 610-exhaust pipe; 620-filter screen; 710-inclined bearing platform; 720-scraper; 730-grid cutting knife; 740-crushed material conveying assembly; 800-final mixing bin. DETAILED DESCRIPTION

[0050] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0051] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] Embodiment 1

[0054] A preparation process of cement slurry plugging material, used for preparing cement slurry plugging material containing fiber; Figure 1 and Figure 2 As shown, a cement slurry plugging material preparation system is provided, which includes a load-bearing support frame for supporting and positioning, a fiber conveying assembly, a spray wetting assembly 200, a fiber output assembly 300, an air blowing smoothing assembly 400, a dipping roller assembly, an air suction de-agglomeration assembly, a conveying assembly and a final mixing chamber 800.

[0055] The main body of the fiber conveying component is a conveyor belt structure, including a mesh conveyor belt 110, a driving wheel 120, a guide wheel 130, and a belt body vibration component 140; the mesh conveyor belt 110 is an annular belt body with a mesh structure, which is horizontally arranged, and is made of metal or conductive plastic, and is grounded, and is supported into an elongated circle by the driving wheel 120 and the guide wheel 130; the mesh conveyor belt 110 is densely covered with limit strips 111, which are metal wires perpendicular to the mesh conveyor belt 110, and the bottom is fixed on the mesh conveyor belt 110, with a length of less than 1 cm, and is used to limit the movement of the fiber; the driving wheel 120 and the guide wheel 130 are both cylindrical wheels, and the driving wheel 120 has a built-in motor, and both are The guide wheel 130 is close to the mesh conveyor belt 110; the guide wheel 130 is closer to the dipping roller assembly than the driving wheel 120; the belt body vibration assembly 140 is a combination of a motor and a cam, and is arranged close to the mesh conveyor belt 110 and the guide wheel 130. The cam rotates and frequently impacts the mesh conveyor belt 110 to cause the mesh conveyor belt 110 to vibrate, thereby facilitating the fibers adhering to the mesh conveyor belt 110 to fall off; a heating unit 131 is provided in the guide wheel 130, and the heating unit 131 is preferably a resistance heating plate, which is used to heat the surface of the guide wheel 130 and thereby indirectly dry the fibers in contact with the mesh conveyor belt 110, thereby facilitating the fibers adhering to the mesh conveyor belt 110 to fall off.

[0056] The main body of the spray wetting component 200 is an atomizing nozzle, which is arranged close to the driving wheel 120 and is used to spray water mist to the fiber conveying component and then wet the mesh conveyor belt 110.

[0057] The fiber output assembly 300 is located directly above the fiber conveying assembly and between the spray wetting assembly 200 and the guide wheel 130. It is used to deliver fibers to the mesh conveyor belt 110 in a timely and quantitative manner, and includes a silo 310 and a quantitative discharge assembly 320. The silo 310 is a container for storing fibers, and the quantitative discharge assembly 320 is used to output fibers to the mesh conveyor belt 110. Its main structure is a feed auger and a shifting blade. The discharge port is in the shape of a long strip. The length direction of the discharge port is parallel to the axial direction of the mesh conveyor belt 110, and the length is slightly smaller than the width of the mesh conveyor belt 110. The discharge port is one to three centimeters away from the mesh conveyor belt 110.

[0058] The air blowing and smoothing component 400 is a combination of an air pump and a gas nozzle. The gas nozzle is close to the guide wheel 130 and blows air toward the fiber conveying component. The height of the gas nozzle is one to two centimeters higher than the mesh conveyor belt 110. The air outlet of the gas nozzle is a flat rectangle. The length of the air outlet is greater than or equal to the width of the mesh conveyor belt 110. It serves to blow away the clumped fibers on the mesh conveyor belt 110 when blowing, so that the fibers can be laid on the mesh conveyor belt 110 more evenly and flatly.

[0059] The dipping roller assembly is a cylindrical roller structure as a whole, used for bonding cement slurry and fiber, including a roller body 510, a surface heating assembly 520, a mud pool 530 and a mud supplement assembly 540;

[0060] The roller body 510 is a cylindrical roller, which is arranged horizontally and positioned on the bearing support frame, and is driven by a motor to rotate. The side surface is rolled with patterns and has a rough surface. The roller body 510 is located below the fiber conveying assembly.

[0061] The surface heating assembly 520 is positioned inside the drum body 510 and is a resistance heating plate, which is used to heat the mud adhered to the local side of the drum body 510 to solidify it and then fix the fibers adhered to the mud;

[0062] The mud pool 530 is located directly below the drum body 510 . The mud therein is a mixture of cement and water. The mud level in the mud pool 530 is higher than the lowest point of the drum body 510 . The mud replenishing assembly 540 is a combination of a mud pump and a delivery pipeline, which is used to replenish the mud pool 530 with mud.

[0063] Preferably, in order to prevent the mud in the mud pool 530 from settling and solidifying, the mud in the mud pool 530 circulates under the action of the mud replenishing assembly 540 .

[0064] The air suction and de-agglomeration assembly is used to absorb the steam emitted when the mud pool 530 is heated, and to absorb the excess clumped fibers on the drum body 510; the air suction and de-agglomeration assembly includes an exhaust pipe 610 and a filter screen 620; the exhaust pipe 610 is connected to the air pump; the filter screen 620 is fixed at the end or inside of the exhaust pipe 610.

[0065] The conveying assembly is used to transport the solidified fiber, cement and water mixture on the drum body 510 to the final mixing bin 800, and includes an inclined carrier 710, a scraper 720, a grid cutting knife 730 and a crushed material conveying assembly 740;

[0066] The inclined support platform 710 is an inclined platform, which is higher near the drum body 510 and lower away from the drum body 510, and is used to guide the cement separated from the drum body 510 to move downward and support the positioning grid cutting knife 730;

[0067] The scraper 720 is a triangular prism plate, one edge of which is rotatably connected to the inclined support platform 710, and the other edge of which is closely attached to the roller body 510. As the roller body 510 rotates, the (dry or semi-dry) solid mixture on the roller body 510 is scraped off by the scraper 720 and moved to the inclined support platform 710.

[0068] The grid cutting knife 730 is a grid-shaped longitudinally arranged tube body, which is slidably positioned on the bearing support frame, and cuts the mixture on the inclined bearing platform 710 into sheets when it moves downward; a heating component is provided at a position of the grid cutting knife 730 close to the inclined bearing platform 710, which is used to heat the grid cutting knife 730 and facilitate cutting of the fibers;

[0069] The crushed material conveying assembly 740 is a conveyor belt structure or a slideway structure, which is used to convey the mixture on the inclined support platform 710 to the final mixing bin 800 for mixing.

[0070] The final mixing bin 800 is a container with a built-in stirring assembly, which is used to mix the ingredients of the cement slurry plugging material.

[0071] The steps are:

[0072] 1. Control the spray wetting component 200 to spray water mist to wet the mesh conveyor belt 110;

[0073] 2. Control the fiber output component 300 to output fibers onto the moistened mesh conveyor belt 110, and control the driving wheel 120 to rotate, and then control the air blowing and smoothing component 400 to output gas to blow the fibers on the mesh conveyor belt 110 evenly (the mesh conveyor belt 110 will adhere to the mesh conveyor belt 110 due to the water on the mesh conveyor belt 110, and the unadhered fibers are easily blown away);

[0074] 3. Control the guide wheel 130 to heat and control the belt body vibration assembly 140 to rotate so that the fibers adhered to the mesh conveyor belt 110 gradually fall onto the continuously rotating drum body 510; the drum body 510 rotates to adhere to the mixture of cement and water in the mud pool 530, and the fibers falling on the drum body 510 will adhere to the above mixture and form a new mixture;

[0075] 4. Control the surface heating assembly 520 near the air suction de-agglomeration assembly to operate, so that the mixture adhering to the drum body 510 is solidified, and at the same time, the air suction de-agglomeration assembly is used to suck away the large clumps of fibers that are not fixed;

[0076] 5. With the continuous rotation of the drum body 510, the mixture adhering to the drum body 510 will be scraped off by the scraper 720 and moved under the grid cutting knife 730 to be cut into slices; then the mixture is sent to the final mixing bin 800 through the crushed material conveying assembly 740;

[0077] 6. In the final mixing bin 800, the dry materials are first stirred and mixed, and then water is added and mixed to finally form the finished product.

[0078] Preferably, Figure 3As shown, the scraper 720 is connected to the inclined support platform 710 and rotates under the drive of the motor. The mixture can be scraped off after the drum body 510 rotates multiple times, that is, the multi-layer composite of the cement layer 001 and the fiber layer 002 is achieved.

[0079] A cement slurry plugging material is prepared by mixing 545 to 660 parts by weight of cement, 7.8 to 9.6 parts by weight of G306 (oil well cement fluid loss reducer), 1.4 to 1.95 parts by weight of USZ (drag reducer for oil well cement), 230 to 280 parts by weight of water and 1.7 to 2.4 parts by weight of fiber. The G306 (oil well cement fluid loss reducer) reduces water loss by forming a dense polymer film and increasing the viscosity of the water phase. The USZ (drag reducer for oil well cement) adjusts the surface charge of cement particles to obtain appropriate cement slurry rheology, thereby reducing pump pressure, improving displacement efficiency and facilitating construction. The fiber is used to reduce the formation and development of microcracks and improve the anti-cracking, anti-seepage and anti-abrasion properties of the mortar.

[0080] Preferably, the cement slurry plugging material is prepared by mixing 625 parts by weight of cement, 8.7 parts by weight of G306 (oil well cement fluid loss reducer), 1.8 parts by weight of USZ (drag reducer for oil well cement), 260 parts by weight of water and 1.73 parts by weight of fiber; the fiber is polypropylene fiber.

[0081] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0082] The technical problem of difficult fiber dry mixing has been solved. The mixing efficiency of cement slurry plugging material containing fibers prepared by using the cement slurry plugging material preparation system is higher than the direct stirring efficiency in the prior art, the preparation time is shorter, the distribution of fibers in the prepared finished product is more uniform, and the amount of clumped fibers is also less.

[0083] Embodiment 2

[0084] In order to reduce the noise when the scraper 720 scrapes off the mixture on the roller body 510 and the noise when the grid cutter 730 impacts and cuts the mixture on the inclined support platform 710, reduce the probability of the mixture on the roller body 510 not being cleanly scraped off, and reduce the wear of the scraper 720 and the grid cutter 730 to extend the service life of the entire system; reduce equipment maintenance (for example, adjust the gap between the scraper 720 and the roller body 510, clean the mixture that may be adhered to the grid cutter 730); the embodiment of the present application optimizes and improves the structure of the dipping roller assembly and the conveying assembly on the basis of the above embodiment, specifically:

[0085] like Figure 4 and Figure 5As shown, the dipping roller assembly includes a central support rod 550, a rotating bearing ring 551, a tubular steel belt 560, an elastic side plate 561, a first cutting knife 591, a second cutting knife 592, a mud pool 530, a mud replenishing assembly 540, and a deformation guide roller 580 fixed to the central support rod 550 through a bracket, and also includes a heating plate 571 fixed to the side wall of the central support rod 550 through a bearing frame 572. The heating plate 571 is used to heat the tubular steel belt 560 at a local position, and is preferably a resistance heating plate, which is located between the central support rod 550 and the inner wall of the tubular steel belt 560 and is arranged close to the inner wall of the tubular steel belt 560;

[0086] The central support rod 550 is a hard rod body, one end of which is fixed on the bearing support frame, and is used to bear and fix the rotating bearing ring 551;

[0087] There are two rotating bearing rings 551, which are circular rings sleeved on the central support rod 550 and rotate around their own axes under the drive of a motor (rotatably connected to the central support rod 550); the distance between the two rotating bearing rings 551 is greater than 40 cm; the rotating bearing rings 551 are used to fix the elastic side plates 561 and indirectly fix the tubular steel belt 560;

[0088] The elastic side plate 561 is a flat washer-shaped (flat annular) rubber elastic sheet, which is sleeved and fixed on the outer ring of the rotating bearing ring 551 and corresponds to the rotating bearing ring 551 one by one;

[0089] The tubular steel belt 560 is a tubular belt body formed by bending a thin steel plate, with a rough surface, and the edges are respectively fixed on the outer rings of the two elastic side plates 561; the tubular steel belt 560, the elastic side plates 561, the rotating bearing ring 551 and the central support rod 550 together enclose a closed space that is approximately cylindrical;

[0090] There are multiple deformation guide rollers 580, which are closely attached to the inner wall of the tubular steel belt 560, and support the tubular steel belt 560 into a column with a cam-shaped longitudinal section;

[0091] The main bodies of the first cutting knife 591 and the second cutting knife 592 are both cylindrical, positioned on the bearing support frame and close to the outer wall of the tubular steel belt 560, and rotated by the motor; the first cutting knife 591 and the second cutting knife 592 are both located above the tubular steel belt 560; Figure 6 As shown, the first cutting knife 591 is a cylinder with a plurality of annular sheets evenly distributed on the side wall, and the annular sheets are provided with a resistance heating wire or a resistance heating plate; Figure 7 As shown, the second cutting knife 592 is a cylinder with a plurality of strip-shaped sheets evenly distributed on the side wall, and the strip-shaped sheets are provided with a resistance heating wire or a resistance heating plate;

[0092] The mud pool 530 is located directly below the tubular steel belt 560 . The mud therein is a mixture of cement and water. The mud level in the mud pool 530 is higher than the lowest point of the tubular steel belt 560 . The mud replenishing assembly 540 is a combination of a mud pump and a conveying pipeline, which is used to replenish the mud pool 530 with mud.

[0093] The conveying assembly only includes a crushed material conveying assembly 740, which conveys the mixture dropped from the dipping roller assembly to the final mixing bin 800 for mixing.

[0094] In the actual preparation process: the mixture adhered to the tubular steel belt 560 is heated into a solid state by the heating plate 571, and then is rotated and cut into sheets by the first cutting knife 591 and the second cutting knife 592 in turn, and then detaches from the tubular steel belt 560 at the short-distance and large-angle bend of the tubular steel belt 560 and falls onto the crushed material conveying assembly 740.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for preparing a cement slurry plugging material, characterized in that: A cement slurry plugging material preparation system including a mesh conveyor belt (110), a roller body (510), a mud pool (530), a scraper (720) and a final mixing bin (800); The preparation steps are as follows: 1) Wetting the mesh conveyor belt (110); 2) delivering the fibers onto the moistened mesh conveyor belt (110), and blowing the fibers on the mesh conveyor belt (110) evenly by means of air blowing; 3) rotating the wet mesh conveyor belt (110) so that the fibers adhered thereto gradually fall onto the continuously rotating drum body (510); the drum body (510) will adhere to the mixture of cement and water in the mud pool (530) when rotating, and the fibers falling onto the drum body (510) will adhere to the above mixture and form a new mixture; 4) heating and curing the mixture of cement, water and fibers adhered to the drum body (510), and at the same time sucking away the water vapor and unfixed large clumps of fibers generated by heating by means of suction; 5) scraping off the mixture adhering to the drum body (510) with a scraper (720); cutting the mixture into slices and then sending the slices into the final mixing bin (800) for dry mixing with other solid raw materials of cement slurry plugging material; 6) Add water and mix to form the finished product.

2. The preparation process of the cement slurry plugging material according to claim 1, characterized in that: The cement slurry plugging material preparation system comprises a bearing support frame for supporting and positioning, a fiber conveying assembly whose main body is a conveyor belt structure, a spray wetting assembly (200) whose main body is an atomizing nozzle, a fiber output assembly (300) located directly above the fiber conveying assembly, an air blowing and smoothing assembly (400) for blowing air toward the fiber conveying assembly, a dipping roller assembly, an air suction and de-agglomeration assembly, a conveying assembly for conveying the mixture on the inclined bearing platform (710) to the final mixing bin (800), and the final mixing bin (800) being a container with a built-in stirring assembly; The dipping drum assembly is a cylindrical drum structure as a whole, used for bonding cement slurry and fiber, and comprises a drum body (510) located below the fiber conveying assembly, a surface heating assembly (520) positioned inside the drum body (510), a mud pool (530) located directly below the drum body (510), and a mud replenishing assembly (540) which is a combination of a mud pump and a conveying pipeline; The air suction and de-agglomeration assembly comprises an air suction pipe (610) and a filter screen (620); The conveying assembly comprises an inclined bearing platform (710) for guiding cement detached from the roller body (510) to move downward, a scraper (720) closely attached to the roller body (510), a grid cutting knife (730) and a crushed material conveying assembly (740).

3. The preparation process of the cement slurry plugging material according to claim 2, characterized in that: The fiber conveying assembly comprises a mesh conveying belt (110), a driving wheel (120), a guide wheel (130), and a belt body vibration assembly (140); The mesh conveyor belt (110) is an annular belt body with a mesh structure, which is horizontally arranged and grounded, and is supported by a driving wheel (120) and a guide wheel (130) in an oblong shape; The mesh conveyor belt (110) is densely covered with limiting strips (111), which are metal wires perpendicular to the mesh conveyor belt (110), with the bottom fixed on the mesh conveyor belt (110) and a length of less than 1 cm, and are used to limit the movement of the fibers; The driving wheel (120) and the guide wheel (130) are both cylindrical wheels, the driving wheel (120) has a built-in motor, and both are in close contact with the mesh conveyor belt (110); The guide wheel (130) is closer to the dipping roller assembly relative to the driving wheel (120); The belt body vibration assembly (140) is a combination of a motor and a cam, and is arranged close to the mesh conveyor belt (110) and the guide wheel (130). The cam rotates to impact the mesh conveyor belt (110) to vibrate the mesh conveyor belt (110), so that the fibers adhered to the mesh conveyor belt (110) fall off; The guide wheel (130) is provided with a heating unit (131) for heating the surface of the guide wheel (130) and thereby indirectly drying the fibers in contact with the mesh conveyor belt (110), so as to make the fibers adhering to the mesh conveyor belt (110) fall off.

4. The preparation process of the cement slurry plugging material according to claim 2, characterized in that: The fiber output component (300) comprises a silo (310) and a quantitative discharge component (320); The silo (310) is a container for storing fibers, and the quantitative discharging component (320) is used to output fibers to the mesh conveyor belt (110). Its main structure is a feeding auger and a shifting blade. The discharging port is in the shape of a long strip, and the length direction of the discharging port is parallel to the axial direction of the mesh conveyor belt (110), and the length is less than the width of the mesh conveyor belt (110).

5. The preparation process of the cement slurry plugging material according to claim 2, characterized in that: The grid cutting knife (730) is a grid-shaped longitudinally arranged tube body, which is slidably positioned on the load-bearing support frame, and cuts the mixture on the inclined load-bearing platform (710) into sheets when it moves downward; the grid cutting knife (730) is provided with a heating component near the inclined load-bearing platform (710) for heating the grid cutting knife (730).

6. The process for preparing the cement slurry plugging material according to any one of claims 2 to 5, characterized in that: The mud in the mud pool (530) circulates under the action of the mud replenishing assembly (540).

7. The process for preparing the cement slurry plugging material according to any one of claims 2 to 5, characterized in that: The scraper (720) is driven by a motor to be rotatably connected to the inclined support platform (710), and scrapes off the mixture after the drum body (510) rotates multiple times.

8. The process for preparing the cement slurry plugging material according to claim 2, characterized in that: The mesh conveyor belt (110) is made of metal or conductive plastic.

9. The preparation process of the cement slurry plugging material according to claim 2, characterized in that: The dipping roller assembly comprises a central support rod (550), a rotating bearing ring (551), a tubular steel belt (560), an elastic side plate (561), a first cutting knife (591), a second cutting knife (592), a mud pool (530), a mud replenishing assembly (540), and a deformable guide roller (580) fixed to the central support rod (550) via a bracket, and also comprises a heating plate (571) fixed to the side wall of the central support rod (550) via a bearing frame (572); The central support rod (550) is fixed on the load-bearing support frame; The number of the rotating bearing rings (551) is two, which are circular rings sleeved on the central support rod (550); The elastic side plate (561) is a flat washer-shaped rubber elastic sheet, which is sleeved and fixed on the outer ring of the rotating bearing ring (551); The tubular steel belt (560) is a tubular belt body, and the edges are respectively fixed on the outer rings of the two elastic side plates (561); There are a plurality of deformation guide rollers (580), which are closely attached to the inner wall of the tubular steel belt (560) to support the tubular steel belt (560) into a column with a cam-shaped longitudinal section; The main bodies of the first cutting knife (591) and the second cutting knife (592) are both cylindrical and rotated under the drive of a motor; the first cutting knife (591) is a cylinder with a plurality of annular sheets evenly distributed on the side wall; the second cutting knife (592) is a cylinder with a plurality of strip sheets evenly distributed on the side wall, and the strip sheets are provided with a resistance heating wire or a resistance heating plate; The conveying assembly includes a crushed material conveying assembly (740), which conveys the mixture dropped from the dipping roller assembly to the final mixing bin (800) for mixing.

10. The process for preparing the cement slurry plugging material according to claim 4, characterized in that: The material outlet is one to three centimeters away from the mesh conveyor belt (110).

Images