A well drilling self-expanding plug

Abstract

The application belongs to the field of plugging agent materials, and particularly relates to a drilling self-expanding plugging agent, which comprises the following raw materials in percentage by mass: 45-52% of inorganic framework material, 12-18% of self-expanding composite component, 9-14% of bridging and reinforcing composite component, 6-10% of setting and solidifying composite component, 2-5% of flow stabilizing and dispersing composite component, and the balance of deionized water; the inorganic framework material is composed of the following raw materials in percentage by mass: 30-40% of wollastonite powder, 20-28% of heavy calcium carbonate, 15-22% of metakaolin, 10-16% of superfine quartz powder, and the balance of slag powder; the self-expanding composite component is composed of the following raw materials in percentage by mass: 26-32% of sodium bentonite, 18-24% of crosslinked sodium polyacrylate, 12-18% of attapulgite, 8-12% of sodium carboxymethyl cellulose, and the balance of light-burned magnesium oxide. The application realizes the technical leap from 'extensive crushing' to 'fine compounding' by adopting the accurate proportioning of 45-52% of inorganic framework material and 12-18% of self-expanding component and the special crushing processing technology.

Description

Technical Field

[0001] This invention belongs to the field of plugging agent materials, and in particular relates to a drilling self-expanding plugging agent. Background Technology

[0002] Traditional drilling self-expanding plugging agents lack efficient self-expanding polymer materials, resulting in low expansion ratios and an inability to effectively compensate for the volume of microcracks and pores. After plugging, the material shrinkage can easily create microchannels. Due to the lack of bridging and reinforcing fibers and particles, the plugging agent cannot form a bridging structure when entering the leakage channel, and the material is easily lost directly, failing to form a preliminary barrier skeleton within the leakage channel. Furthermore, the lack of a stable flow dispersion system leads to poor slurry rheological properties, making it prone to stratification and sedimentation during construction, or causing pumping difficulties due to excessive air bubbles, thus failing to guarantee the stability of long-distance transportation.

[0003] Furthermore, in the production of drilling plugging and sealing agents (such as cement-based composite materials and polymer plugging agents), the raw materials need to be pulverized to ensure uniform particle size and meet the requirements of material flowability and sealing properties during construction. Currently, commonly used pulverizing devices include horizontal mixing pulverizing drums, vertical hammer mills, and single-drive grinding devices. Some devices have a fixed grid or a single extrusion plate at the feed inlet for simple pretreatment. These devices can basically meet the basic pulverization needs of loose raw materials and are widely used in small and medium-sized production enterprises. Existing equipment for processing plugging and sealing materials... When dealing with agglomerated raw materials, the core problem is low crushing efficiency and poor effect. Because the raw materials are prone to absorbing moisture and forming hard lumps under pressure, existing equipment either lacks a dedicated pre-crushing structure, and the lumps directly enter the main crushing mechanism, exceeding the single crushing capacity of the crushing components, resulting in rapid component wear, frequent failures, and a large amount of uncrushed lumps that require rework; or the pre-extrusion structure lacks elastic support and precise guidance, and cannot adaptively adjust the pressure, which easily leads to incomplete crushing or material caking, and the crushed material is difficult to transport smoothly, ultimately resulting in uneven material particle size and affecting the quality of downhole sealing. Summary of the Invention

[0004] The purpose of this invention is to address the core problems of low crushing efficiency and poor performance of existing devices when processing agglomerated raw materials for water plugging and leak sealing materials, as mentioned in the background art. Because the raw materials are prone to absorbing moisture and forming hard lumps under pressure, existing devices either lack a dedicated pre-crushing structure, allowing the lumps to directly enter the main crushing mechanism, exceeding the single-pass crushing capacity of the crushing components, resulting in rapid component wear, frequent malfunctions, and a large amount of uncrushed lumps requiring rework, or the pre-extrusion structure lacks elastic support and precise guidance, making it unable to adaptively adjust the pressure, easily leading to incomplete crushing or material caking, and making it difficult to smoothly transport the crushed material, ultimately resulting in uneven material particle size and affecting the quality of downhole sealing. The invention provides a drilling self-expanding sealing agent.

[0005] To achieve the above objectives, the present invention employs the following technical solution: a drilling self-expanding plugging agent, wherein the drilling self-expanding plugging agent comprises the following raw materials by mass percentage: 45-52% inorganic skeleton material, 12-18% self-expanding composite component, 9-14% bridging and reinforcing composite component, 6-10% coagulation-promoting composite component, 2-5% flow-stabilizing and dispersing composite component, and the balance being deionized water; the inorganic skeleton material is composed of the following raw materials by mass percentage: The self-expanding composite component consists of the following raw materials by mass percentage: 30-40% wollastonite powder, 20-28% heavy calcium carbonate, 15-22% metakaolin, 10-16% ultrafine quartz powder, with the balance being slag powder; 26-32% sodium bentonite, 18-24% cross-linked sodium polyacrylate, 12-18% attapulgite, 8-12% sodium carboxymethyl cellulose, with the balance being lightly calcined magnesium oxide; the bridging and reinforcing composite component consists of the following raw materials by mass percentage: Material composition: 28-36% walnut shell powder, 18-24% mica flakes, 12-18% chopped basalt fiber, 8-12% nitrile rubber powder, with the balance being graphite powder; the coagulation-promoting composite component consists of the following raw materials by mass percentage: 24-30% aluminate cement, 16-22% anhydrous gypsum, 10-16% sodium aluminate, 8-12% sodium sulfate, with the balance being calcium sulfoaluminate expanding agent; the flow-stabilizing and dispersing composite component consists of the following raw materials by mass percentage... Material composition: 30-40% sodium lignosulfonate, 18-24% polycarboxylate superplasticizer, 8-12% organosilicon defoamer, with the balance being sodium citrate; the liquid absorption ratio of the cross-linked sodium polyacrylate is 80-150 times its own mass, and the length of the short-cut basalt fiber is 2-6mm; the drilling self-expanding plugging agent is mixed at a material-to-liquid ratio of 1:0.25-0.40 and stirred at 600-900r / min for 8-15min.

[0006] Furthermore, the drilling self-expanding plugging agent is processed using a pulverizing device. This pulverizing device includes an assembly base, support plates, a rotating cylinder, a first drive device, a second drive device, a drive arm, pulverizing heads, a support frame, an auxiliary pulverizing mechanism, and a connecting assembly. The support plates are symmetrically fixedly connected to the top two ends of the assembly base. The rotating cylinder is rotatably connected to the inner walls of the two support plates. The first drive device is installed on the outer wall of one of the support plates, and its output end is fixedly connected to one end of the rotating cylinder. The second drive device is installed on the outer wall of the other support plate. The drive arm is rotatably connected to the inner wall of the rotating cylinder at an eccentric position, and its output end is fixedly connected to one end of the drive arm. Multiple pulverizing heads are fixedly sleeved on the drive arm at equal intervals. The support frame is fixedly connected to the assembly base. The auxiliary pulverizing mechanism is installed on the support frame. The connecting assembly is provided between the auxiliary pulverizing mechanism and the rotating cylinder, and they are connected through the connecting assembly.

[0007] Furthermore, the auxiliary crushing mechanism includes a conveying sleeve, a third driving device, a pressure plate, a support plate, and a connecting member. The conveying sleeve is fixedly connected to the top of the support frame. The third driving device is installed on the top of the conveying sleeve. The output end of the third driving device passes through the top of the conveying sleeve and is fixedly connected to the top of the pressure plate. A fixed inner plate is fixedly connected to the inner wall of the conveying sleeve. The pressure plate and the support plate are slidably connected to the inner wall of the fixed inner plate. A connecting member is provided between the bottom of the fixed inner plate and the support plate, and they are connected through the connecting member.

[0008] Furthermore, the connector includes a support base, connecting arms, a support sleeve, a support rod, and a support spring. The support base is fixedly connected to the bottom of the support plate. One end of each of the connecting arms is fixedly connected to the outer wall of the support base in a circumferential array. The outer wall of the support sleeve is fixedly connected to the other end of each connecting arm. One end of the support rod slides through the top of the support sleeve. A support spring is provided between one end of the support rod and the bottom inner side of the support sleeve, and the support rod is connected to the bottom of the fixed inner plate.

[0009] Furthermore, the connecting assembly includes a fourth driving device, a support arm, and a connecting sleeve plate. The fourth driving device is installed on the top of the support frame, and the output end of the fourth driving device passes through the top of the support frame and is fixedly connected to one end of the support arm. The outer wall of the connecting sleeve plate is fixedly connected to the other end of the support arm, and a corrugated pipe is provided between the connecting sleeve plate and the discharge port of the conveying sleeve plate.

[0010] Furthermore, the drive arm is located at the bottom of the inner wall of the rotating cylinder.

[0011] Furthermore, the support arm has an L-shaped structure, and the outer wall of the rotating cylinder is fixedly connected to an injection port, and the inner wall of the connecting sleeve is fitted and connected to the outer wall of the rotating cylinder.

[0012] Furthermore, the inner wall of the support plate is provided with a guide groove, and the end of the rotating cylinder is rotatably engaged in the guide groove.

[0013] Furthermore, both the injection port and the connecting sleeve are equipped with solenoid valves.

[0014] Compared with existing technologies, the advantages of this self-expanding drilling plugging agent are:

[0015] 1. This invention uses 45-52% wollastonite powder, heavy calcium carbonate, metakaolin, ultrafine quartz powder, and slag powder as the main body of the sealing agent, providing basic strength and rigidity to ensure that the material can enter the leakage channel and form a basic filling; 12-18% sodium bentonite, cross-linked sodium polyacrylate (absorbing 80-150 times the liquid), attapulgite, sodium carboxymethyl cellulose, and lightly calcined magnesium oxide as self-expanding composite components, which expand significantly after absorbing liquid, and refill the gaps after the skeleton is filled, solving the problem of microcracks caused by shrinkage in traditional materials and significantly improving the tightness of the seal; 9-14% walnut shell powder, mica flakes, short-cut basalt fiber (2-6mm), nitrile rubber powder, and graphite powder as... To bridge and reinforce the composite components, fibers and sheet materials are used to form a "bridging" structure within irregular leakage channels, preventing further material loss and enhancing the toughness after consolidation to prevent brittle cracking. 6-10% of aluminate cement, anhydrous gypsum, sodium aluminate, sodium sulfate, and calcium sulfoaluminate expansion agent serve as a coagulation-promoting composite component, facilitating the rapid formation of a stable consolidation network in the downhole environment, shortening the setting time, and improving the timeliness of plugging operations. 2-5% of sodium lignosulfonate, polycarboxylate superplasticizer, silicone defoamer, and sodium citrate serve as a flow-stabilizing and dispersing composite component, maintaining uniform dispersion of the slurry during mixing and transportation, preventing stratification and localized aggregation, ensuring construction fluidity, and avoiding pump blockage.

[0016] 2. This invention achieves elastic adaptive pre-crushing of agglomerated raw materials through an auxiliary crushing mechanism's conveying sleeve, a pressure plate driven by a third driving device, a support plate with vent holes, and a connecting component containing a support spring. When the pressure plate presses down, the support plate stably supports the material under the action of the support spring, and the crushing ridges squeeze out the agglomerated material. The vent holes release airflow to prevent material caking, and the limiting boss avoids damage to the components. After pre-crushing, the pressure plate continues to push the support plate to feed the material. This solves the problem in traditional devices where the lack of pre-crushing leads to agglomerated material directly entering the main crushing mechanism, exceeding the single crushing capacity of the crushing components, and thus causing rapid wear of the crushing head, frequent equipment failures, and the need for rework, significantly improving crushing efficiency.

[0017] 3. This invention achieves precise docking and sealed conveying of pre-crushed materials through a fourth drive device in the connecting assembly, an L-shaped support arm, a connecting sleeve plate with a sealing gasket, a bellows, and a synchronous solenoid valve on the inlet and the connecting sleeve plate. The fourth drive device adjusts the support arm to make the connecting sleeve plate fit the inlet of the rotating cylinder, the bellows compensates for installation errors and rotational displacement, and the solenoid valve synchronously switches to control the material flow. This solves the problems of material conveying residue and leakage caused by the lack of precise guidance and sealing design in traditional pre-extrusion structures, as well as the impact of docking deviation on continuity, ensuring that the material smoothly enters the main crushing mechanism.

[0018] 4. This invention achieves uniform and fine crushing of materials through a dual-drive synergistic structure of the rotating cylinder (the first drive device drives the rotating cylinder to rotate, and the second drive device drives the drive arm to rotate), the inner wall stirring protrusions, and the scraper on the side of the drive arm: the first drive device drives the rotating cylinder to rotate, the stirring protrusions cause the material to tumble, the second drive device drives the drive arm located at the bottom of the cylinder to rotate eccentrically, the tungsten carbide crushing head and the stirring protrusions work together to shear, and the scraper scrapes off the material from the cylinder wall; thus solving the problems of limited crushing range, material deposition at the bottom of the cylinder or adhering to the cylinder wall, resulting in uneven crushing and substandard particle size in traditional devices, and finally producing a uniform particle size water plugging and leak sealing material that meets the requirements of downhole construction, avoiding the problems of insufficient sealing layer density and residual leakage channels. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a pulverizing device used in the processing of a drilling self-expanding plugging agent provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the rotating cylinder of a pulverizing device used in the processing of drilling self-expanding plugging agent provided by the present invention. Figure 2 ;

[0021] Figure 3 This invention provides a pulverizing device for processing drilling self-expanding plugging agents. Figure 2 A magnified structural diagram of part A in the middle;

[0022] Figure 4 This is a schematic diagram of the internal structure of the conveying sleeve of a crushing device used in the processing of drilling self-expanding plugging agent provided by the present invention;

[0023] Figure 5 This invention provides a pulverizing device for processing drilling self-expanding plugging agents. Figure 5 A magnified structural diagram of section B in the middle;

[0024] Figure 6 This is a schematic diagram of the structure of a crushing device connection assembly used in the processing of a drilling self-expanding plugging agent provided by the present invention.

[0025] As shown in the figure:

[0026] 1. Assembly base; 2. Support plate; 3. Rotating cylinder; 4. First drive device; 5. Second drive device; 6. Drive arm; 7. Crushing head; 8. Support frame;

[0027] 9. Auxiliary crushing mechanism; 91. Conveying sleeve; 911. Fixed inner plate; 92. Third drive device; 93. Pressure plate; 94. Support plate; 95. Connecting piece; 951. Support base; 952. Connecting arm; 953. Support sleeve; 954. Support rod; 955. Support spring;

[0028] 10. Connecting component; 101. Fourth drive device; 102. Support arm; 103. Connecting sleeve. Detailed Implementation

[0029] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] A drilling self-expanding plugging agent comprises the following raw materials by mass percentage: 45-52% inorganic skeleton material, 12-18% self-expanding composite component, 9-14% bridging and reinforcing composite component, 6-10% coagulation-promoting composite component, 2-5% flow-stabilizing and dispersing composite component, with the balance being deionized water; the inorganic skeleton material is composed of the following raw materials by mass percentage: 30-40% wollastonite powder, 20-28% heavy calcium carbonate, 15-22% metakaolin, 10-16% ultrafine quartz powder, with the balance being slag powder; the self-expanding composite component is composed of the following raw materials by mass percentage: 26-32% sodium bentonite, 18-24% cross-linked sodium polyacrylate, 12-18% attapulgite, 8-12% sodium carboxymethyl cellulose, with the balance being lightly calcined magnesium oxide; the bridging and reinforcing composite component is composed of the following raw materials by mass percentage: 28-36% walnut shell powder, ... The composite component consists of 18-24% mica flakes, 12-18% chopped basalt fiber, 8-12% nitrile rubber powder, with the balance being graphite powder; the coagulation-promoting composite component is composed of the following raw materials by mass percentage: 24-30% aluminate cement, 16-22% anhydrous gypsum, 10-16% sodium aluminate, 8-12% sodium sulfate, with the balance being calcium sulfoaluminate expanding agent; the flow-stabilizing and dispersing composite component is composed of the following raw materials by mass percentage: 30- The mixture contains 40% sodium lignosulfonate, 18-24% polycarboxylate superplasticizer, 8-12% silicone defoamer, and the balance is sodium citrate; the cross-linked sodium polyacrylate has an absorption ratio of 80-150 times its own mass, and the chopped basalt fiber has a length of 2-6 mm; the drilling self-expanding plugging agent is mixed at a material-to-liquid ratio of 1:0.25-0.40 and stirred at 600-900 r / min for 8-15 min.

[0031] It should be noted that the drilling self-expanding plugging agent described in this embodiment is formed by compounding inorganic skeleton material, self-expanding composite component, bridging and reinforcing composite component, coagulation-promoting composite component, and flow-stabilizing and dispersing composite component. Among them, inorganic skeleton material is used to form the main support system of plugging agent, self-expanding composite component is used to form volume compensation after liquid absorption, bridging and reinforcing composite component is used to form overlapping and filling structure in leakage channels, coagulation-promoting composite component is used to form consolidation network in plugging area, and flow-stabilizing and dispersing composite component is used to maintain the dispersion state of each component in liquid phase and the mixing uniformity during construction. The above components can be premixed separately and then formulated with deionized water, or they can be formulated into slurry plugging material by first compounding solids and then modifying liquids, as long as the synergistic relationship between each component in the system can be guaranteed.

[0032] Specifically, when the self-expanding plugging agent is injected into the downhole lost circulation channel, the inorganic skeleton material first enters the fracture, pore, or lost circulation area to form a basic filling. The bridging and reinforcing composite components overlap with each other at irregular positions in the lost circulation channel to form a preliminary blocking structure. The self-expanding composite components then come into contact with the liquid in the channel and expand, thereby further compensating for the gaps between the skeleton filling. The coagulation and consolidation composite components gradually form a consolidation connection in the filling area, so that the components that have entered the lost circulation channel combine into a relatively stable plugging whole. The flow-stabilizing and dispersing composite components keep the slurry uniform throughout the mixing and injection process, avoiding the stratification or local aggregation of the components during transportation. Thus, the plugging agent can simultaneously achieve filling, bridging, expansion, and consolidation after entering the lost circulation channel, thereby solving the problems of insufficient filling, insufficient adhesion, and poor plugging stability that existing plugging materials tend to have after entering the lost circulation channel.

[0033] like Figures 1-6 As shown, this application also includes a crushing device for processing the main material (inorganic skeleton material) in a sealing agent, including a mounting base 1, a support plate 2, a rotating cylinder 3, a first driving device 4, a second driving device 5, a driving arm 6, a crushing head 7, a support frame 8, an auxiliary crushing mechanism 9, and a connecting assembly 10.

[0034] Among them, the support plates 2 are symmetrically fixedly connected to the top two ends of the assembly base 1, the rotating cylinder 3 is rotatably connected to the inner wall of the two support plates 2, the first drive device 4 is installed on the outer wall of one of the support plates 2, and the output end of the first drive device 4 is fixedly connected to one end of the rotating cylinder 3, the second drive device 5 is installed on the outer wall of the other support plate 2, the drive arm 6 is rotatably connected to the eccentric part of the inner wall of the rotating cylinder 3, the output end of the second drive device 5 is fixedly connected to one end of the drive arm 6, multiple crushing heads 7 are fixedly sleeved on the drive arm 6 at equal intervals, and the support frame 8 is fixedly connected to the assembly base 1.

[0035] It should be noted that the support plate 2 described in this embodiment is a high-strength alloy steel plate structure. Its bottom is symmetrically fixed to the top two ends of the assembly base 1 by multiple sets of bolts with anti-loosening washers. A positioning pin is provided between the connecting surfaces of the support plate 2 and the assembly base 1 to ensure that the relative positions of the two support plates 2 are accurately aligned. The rotating cylinder 3 is a cylindrical structure with rotating shafts at both ends. The rotating shafts at both ends are respectively inserted into the inner rings of the pre-set sealed bearings on the inner walls of the two support plates 2. The outer rings of the sealed bearings are interference-fitted with the bearing holes on the inner walls of the support plates 2. At the same time, the outer side of the bearings is sealed and fixed by a pressure cap, which not only realizes the stable rotation of the rotating cylinder 3, but also prevents the crushing process. Dust entering the bearings affects their service life. The inner wall of the rotating cylinder 3 is also equipped with axially distributed stirring ridges to assist in material tumbling and mixing. The first drive device 4 is a servo motor with a reduction gear. Its motor base is detachably mounted on the outer wall of one of the support plates 2 via bolts. The motor output shaft is fixedly connected to one end of the rotating cylinder 3 via a flexible coupling. The flexible coupling can compensate for installation errors and buffer the impact load when the rotating cylinder 3 rotates, ensuring that the first drive device 4 stably drives the rotating cylinder 3 to rotate uniformly around its own axis. The second drive device 5 is also a servo motor, which is fixedly mounted on another... The outer wall of the support plate 2 and the motor output shaft are provided with a sealing sleeve to prevent dust from entering the motor. The drive arm 6 is a solid alloy rod structure, one end of which is rotatably connected to the inner wall of the rotating cylinder 3 at an eccentric position via a bearing. The axis of the drive arm 6 is parallel to the axis of the rotating cylinder 3 and has a preset eccentricity. This eccentricity setting allows the drive arm 6 to drive the crushing head 7 to cover a larger area of ​​material inside the rotating cylinder 3 when it rotates. The output end of the second drive device 5 passes through the side wall of the support plate 2 and the rotating cylinder 3, and is connected to one end of the drive arm 6 by a flat key and welded for reinforcement to ensure stable power transmission. The multiple crushing heads 7 are made of wear-resistant carbon fiber. Made of tungsten carbide, its inner wall has a positioning groove that matches the drive arm 6. It is fixedly fitted onto the drive arm 6 at equal intervals through an interference fit. The distance between adjacent crushing heads 7 matches the distance between the stirring protrusions on the inner wall of the rotating drum 3. This can form a synergistic shearing effect during the material tumbling process, improving the crushing effect. The support frame 8 is a frame-type steel structure. Its bottom is fixedly connected to the top of the mounting base 1 by bolts. The height and position of the support frame 8 can ensure that the auxiliary crushing mechanism 9 installed on it can accurately align with the feed inlet of the rotating drum 3. At the same time, the connection between the support frame 8 and the mounting base 1 is also equipped with reinforcing ribs to improve the overall support stability.

[0036] The auxiliary crushing mechanism 9 is mounted on the support frame 8. A connecting component 10 is provided between the auxiliary crushing mechanism 9 and the rotating cylinder 3, and they are connected through the connecting component 10.

[0037] Specifically, the raw materials for water-blocking and leak-sealing materials, including easily agglomerated cement-based or high-molecular polymer raw materials, are first fed into the auxiliary crushing mechanism 9. The auxiliary crushing mechanism 9 is then activated to pre-crush the agglomerated raw materials. The pre-crushed material is then conveyed to the rotating drum 3 through the connecting component 10. At this time, the first drive device 4 is activated, which drives the rotating drum 3 to rotate at a constant speed around its own axis through a flexible coupling. The stirring ridges on the inner wall of the rotating drum 3 rotate with the drum body, causing the material to continuously tumble and mix. Simultaneously, the second drive device 5 is activated, which drives the drive arm 6 to rotate synchronously at an eccentric position on the inner wall of the rotating drum 3 through the output end of the keyed joint. Multiple tungsten carbide crushing heads 7 on the drive arm 6 rotate with the drive arm 6. Because there is a preset eccentric distance between the drive arm 6 and the rotating drum 3, the crushing heads 7 can cover a larger area of ​​material inside the rotating drum 3, and the distance between adjacent crushing heads 7 is also increased. The spacing between the stirring ridges is matched to the material's rotation, creating a synergistic shearing and impact effect to further refine the pre-crushed material, ultimately resulting in a uniformly sized water-blocking and leak-proofing material. The support frame 8, with its frame-type steel structure and reinforcing ribs, stably supports the auxiliary crushing mechanism 9, ensuring stable bearing of the downward load during pre-crushing operations. The connecting component 10, with its adjustable support arm and corrugated pipe structure, precisely connects the outlet of the auxiliary crushing mechanism 9 to the inlet of the rotating cylinder 3, while also compensating for installation errors and minor displacements during the rotation of the rotating cylinder 3, preventing material leakage and residue. The support plate 2 is stably fixed to the mounting base 1 by positioning pins and anti-loosening bolts. Its inner wall's sealed bearings ensure stable rotation of the rotating cylinder 3 and prevent dust intrusion. Dual drive devices are installed on the outer walls of the support plates 2 on both sides, achieving independent and coordinated power transmission to ensure efficient and continuous crushing operations. This device, through the aforementioned workflow, specifically addresses the core problem of "low crushing efficiency and poor effect of agglomerated materials" mentioned in the background technology. On the one hand, the pre-crushing design of the auxiliary crushing mechanism 9 can pre-crush agglomerated raw materials with high hardness, preventing agglomerated materials from directly entering the rotating drum 3 and exceeding the single crushing capacity of the crushing head 7, reducing the impact load and wear of the crushing head 7, lowering the equipment failure rate, eliminating the need for secondary re-crushing, and significantly improving crushing efficiency. On the other hand, the adjustable and sealed design of the connecting component 10, combined with the dual-drive collaborative crushing structure of the rotating drum 3, the first drive drives the material to flip, and the second drive drives the crushing head 7 to precisely shear. This not only solves the problem of incomplete crushing or material caking caused by the lack of elastic support and guidance in the pre-extrusion structure of traditional devices, but also ensures uniform material crushing through the synergistic effect of the stirring ridge and the crushing head 7, avoiding material residue. The final produced water plugging and leak sealing material has a uniform particle size, meeting the requirements of underground construction for material flowability and sealing performance, and solving problems such as insufficient density of the sealing layer and residual water leakage channels caused by uneven particle size.

[0038] Furthermore, the auxiliary crushing mechanism 9 includes a conveying sleeve 91, a third driving device 92, a pressure plate 93, a support plate 94, and a connecting member 95. The conveying sleeve 91 is fixedly connected to the top of the support frame 8. The third driving device 92 is installed on the top of the conveying sleeve 91. The output end of the third driving device 92 passes through the top of the conveying sleeve 91 and is fixedly connected to the top of the pressure plate 93. A fixed inner plate 911 is fixedly connected to the inner wall of the conveying sleeve 91. The pressure plate 93 and the support plate 94 are slidably connected to the inner wall of the fixed inner plate 911. A connecting member 95 is provided between the bottom of the fixed inner plate 911 and the support plate 94, and they are connected through the connecting member 95.

[0039] It should be noted that the conveying sleeve 91 described in this embodiment is a cylindrical structure that runs vertically through the body. Its bottom is bolted to the top of the support frame 8 via a flange. A rubber sealing gasket is provided at the flange connection to prevent material dust from leaking out from the gaps during the pre-crushing process. The third drive device 92 is an electric push rod, and its cylinder is fixed to the mounting flange on the top of the conveying sleeve 91 by multiple sets of bolts. A dust cover is provided at the point where the output end passes through the conveying sleeve 91 to prevent dust from entering the drive device and affecting its service life. The pressure plate 93 is a circular steel plate. Its diameter is adapted to the inner wall of the fixed inner plate 911, and the bottom is provided with multiple sets of raised crushing ridges, which can enhance the crushing effect on agglomerated materials. The support plate 94 is also a circular structure with multiple small air holes on the surface to prevent the material from caking due to the airflow generated by the compression. The sliding surfaces of the pressure plate 93 and the support plate 94 are coated with polytetrafluoroethylene wear-resistant coating to reduce sliding friction resistance. At the same time, the inner wall of the fixed inner plate 911 is provided with a limiting boss, which can limit the sliding stroke of the pressure plate 93 and the support plate 94 to avoid excessive compression and damage to the connecting piece 95. Furthermore, the connector 95 includes a support base 951, a connecting arm 952, a support sleeve 953, a support rod 954, and a support spring 955. The support base 951 is fixedly connected to the bottom of the support plate 94. One end of the multiple connecting arms 952 is fixedly connected to the outer wall of the support base 951 in a circumferential array. The outer wall of the support sleeve 953 is fixedly connected to the other end of the connecting arm 952. One end of the support rod 954 slides through the top of the support sleeve 953. A support spring 955 is provided between one end of the support rod 954 and the bottom inner side of the support sleeve 953, and they are connected through the support spring 955. The other end of the support rod 954 is fixedly connected to the bottom of the fixed inner plate 911.

[0040] It should be noted that the support base 951 described in this embodiment is a disc-shaped structure, which is fixed to the bottom center of the support plate 94 by full welding to ensure uniform force transmission. There are four connecting arms 952, which are made of stainless steel and bent into shape. The connection between each connecting arm 952 and the support base 951 and the support sleeve 953 is reinforced by fillet welding, and the included angle between adjacent connecting arms 952 is 90° to ensure stable support for the support base 951. The inner wall of the support sleeve 953 is provided with a smooth and wear-resistant bushing to reduce friction loss when sliding with the support rod 954. At the same time, the top of the support sleeve 953 is provided with a limiting ring to prevent the support rod 954 from slipping off. The support spring 955 is a high-strength compression spring, and its two ends are welded and fixed to the inner bottom of the support sleeve 953 and the end of the support rod 954, respectively. The outer side of the spring is covered with a dustproof corrugated tube to prevent dust from affecting the elasticity of the spring. The support rod 954 is a solid steel rod, and its bottom is connected to the threaded hole at the bottom of the fixed inner plate 911 by threads for easy disassembly and maintenance.

[0041] Furthermore, the connecting assembly 10 includes a fourth driving device 101, a support arm 102, and a connecting sleeve 103. The fourth driving device 101 is installed on the top of the support frame 8. The output end of the fourth driving device 101 passes through the top of the support frame 8 and is fixedly connected to one end of the support arm 102. The outer wall of the connecting sleeve 103 is fixedly connected to the other end of the support arm 102. A corrugated pipe is provided between the connecting sleeve 103 and the discharge port of the conveying sleeve 91.

[0042] It should be noted that the fourth drive device 101 described in this embodiment is a servo electric cylinder. Its cylinder body is fixed to the reinforcing mounting plate on the top of the support frame 8 by bolts. The bottom of the mounting plate is provided with reinforcing ribs to improve the load-bearing capacity. The output end of the electric cylinder and the connection end of the support arm 102 are fixed by a coupling. The coupling is a flexible pin coupling, which can compensate for installation errors and buffer vibration. The support arm 102 is made of alloy steel plate bent and formed, and the surface is treated with anti-corrosion to prevent rusting after long-term use. The connecting sleeve 103 is cylindrical and has a flexible sealing gasket on the inner wall. The sealing gasket is made of wear-resistant nitrile rubber to ensure the sealing performance when docking with the rotating cylinder 3. The corrugated pipe is made of food-grade stainless steel, which has good extensibility and corrosion resistance. Its two ends are fixed to the connecting sleeve 103 and the discharge port of the conveying sleeve 91 by clamps, and the length of the corrugated pipe is slightly greater than the maximum stroke of the support arm 102 to avoid stretching damage.

[0043] Furthermore, the drive arm 6 is located at the bottom of the inner wall of the rotating cylinder 3.

[0044] It should be noted that the drive arm 6 described in this embodiment is located at the bottom of the inner wall of the rotating cylinder 3, and the distance between the axis of the drive arm 6 and the bottom of the inner wall of the rotating cylinder 3 is 1 / 5 of the inner diameter of the rotating cylinder 3. This position setting allows the drive arm 6 to fully contact the material at the bottom of the rotating cylinder 3 when it drives the crushing head 7 to rotate, thus preventing the material from accumulating at the bottom of the cylinder and being unable to be crushed. At the same time, a scraper is provided on the side of the drive arm 6 near the inner wall of the rotating cylinder 3. The gap between the scraper and the inner wall of the rotating cylinder 3 is 1-2mm, which can scrape off the material attached to the cylinder wall, ensuring that the material fully participates in the crushing and improving the crushing efficiency and material utilization rate.

[0045] Furthermore, the support arm 102 has an L-shaped structure, and the outer wall of the rotating cylinder 3 is fixedly connected to an injection port, and the inner wall of the connecting sleeve 103 is fitted and connected to the outer wall of the rotating cylinder 3.

[0046] It should be noted that the support arm 102 described in this embodiment has an L-shaped structure with a bending angle of 90°. The horizontal section is connected to the output end of the fourth drive device 101, and the vertical section is fixed to the connecting sleeve 103. This structure allows the connecting sleeve 103 to be precisely aligned with the injection port of the rotating cylinder 3, while reducing the space occupied by the support arm 102. The injection port is funnel-shaped, and its inner diameter gradually decreases from the outside to the inside, which facilitates the smooth flow of materials into the rotating cylinder 3. The injection port is fixed to the outer wall of the rotating cylinder 3 by welding, and the weld is polished to avoid material residue. The inner diameter of the connecting sleeve 103 is adapted to the diameter of the corresponding injection port on the outer wall of the rotating cylinder 3. When the connection is made, the end of the connecting sleeve 103 covers the outer periphery of the injection port, and the sealing gasket on the inner wall of the connecting sleeve 103 is tightly fitted to the outer wall of the rotating cylinder 3 to prevent material leakage from the joint.

[0047] Furthermore, the inner wall of the support plate 2 is provided with a guide groove, and the end of the rotating cylinder 3 is rotatably engaged in the guide groove.

[0048] It should be noted that the guide groove on the inner wall of the support plate 2 described in this embodiment is an arc-shaped structure, and its curvature is consistent with the curvature of the end of the rotating cylinder 3. The inner wall of the guide groove is provided with a wear-resistant bushing, which is made of copper alloy material to reduce friction when the end of the rotating cylinder 3 rotates. The end of the rotating cylinder 3 is provided with an annular protrusion, the width of which is adapted to the width of the guide groove. When rotating and snapping, the annular protrusion is embedded in the guide groove, and the gap between the annular protrusion and the bushing of the guide groove is 0.5-1mm. This ensures that the rotating cylinder 3 can rotate flexibly and also plays a radial limiting role in the rotating cylinder 3 to prevent deviation during rotation. At the same time, the two ends of the guide groove are provided with limiting blocks to limit the axial displacement of the rotating cylinder 3 and prevent the rotating cylinder 3 from moving due to vibration.

[0049] Furthermore, solenoid valves are installed on both the injection port and the connecting sleeve 103.

[0050] It should be noted that the solenoid valves installed on the inlet and connecting sleeve 103 described in this embodiment are two-position two-way solenoid valves, made of corrosion-resistant stainless steel, suitable for dusty environments containing water-blocking and leak-sealing materials. The control end of the solenoid valve is electrically connected to the main control system of the device, enabling synchronous switching control. When the connecting sleeve 103 is aligned with the inlet of the rotating drum 3, the solenoid valve opens synchronously to ensure smooth material conveying. When material conveying is completed or the crushing operation needs to be stopped, the solenoid valve closes synchronously to prevent dust in the rotating drum 3 from overflowing from the inlet. At the same time, the valve core of the solenoid valve is made of wear-resistant ceramic material to extend its service life, and the solenoid valve is equipped with a manual emergency switch for easy operation in emergency situations such as power outages.

[0051] During operation, the inorganic skeleton material to be crushed is first fed into the conveying sleeve 91 of the auxiliary crushing mechanism 9. The raw material falls onto the support plate 94 on the inner wall of the fixed inner plate 911. The third drive device 92 is then activated, which drives the pressure plate 93 to slide downward along the inner wall of the fixed inner plate 911. At this time, the support plate 94 remains stable under the elastic support of the support spring 955 of the connecting piece 95. The crushing edge at the bottom of the pressure plate 93 cooperates with the support plate 94 to squeeze and pre-crush the agglomerated raw material. During the squeezing process, the surface of the support plate 94... The vent holes can release the airflow generated by compression, preventing material caking. The limiting bosses on the inner wall of the fixed inner plate 911 prevent the pressure plate 93 from excessively pressing down and damaging the connecting piece 95. After pre-crushing, the third drive device 92 continues to drive the pressure plate 93 downwards, pushing the support plate 94 to overcome the elastic force of the support spring 955 and slide down along the fixed inner plate 911. When the support plate 94 detaches from the fixed inner plate 911, the pre-crushed material falls to the bottom of the conveyor sleeve 91. At this time, the fourth drive device 101 is activated, driving L... The support arm 102 adjusts the position of the connecting sleeve 103 so that the inner wall of the connecting sleeve 103 fits against the material inlet on the outer wall of the rotating cylinder 3. Then, the solenoid valves on the material inlet and the connecting sleeve 103 are opened simultaneously. The pre-crushed material is conveyed into the rotating cylinder 3 through the bellows and the connecting sleeve 103. After the material is conveyed, the solenoid valve is closed, and the first drive device 4 and the second drive device 5 are started. The first drive device 4 drives the rotating cylinder 3 to rotate at a constant speed around its own axis through the flexible coupling. The annular protrusion at the end of the rotating cylinder 3 rotates stably in the guide groove on the inner wall of the support plate 2. The stirring ridges on the inner wall drive the material to continuously tumble and mix. At the same time, the second drive device 5 drives the drive arm 6 located at the bottom of the inner wall of the rotating cylinder 3 to rotate eccentrically. The tungsten carbide crushing head 7 on the drive arm 6 rotates with it. Because there is a preset eccentricity between the drive arm 6 and the rotating cylinder 3, and the spacing between adjacent crushing heads 7 is adapted to the spacing of the stirring ridges, the crushing head 7 can cover a large area of ​​material inside the rotating cylinder 3, forming a synergistic shearing and impact effect with the stirring ridges to finely crush the material. The scraper on the side of the drive arm 6 can also scrape off the material attached to the inner wall of the rotating cylinder 3 to ensure that the material fully participates in the crushing. During the entire operation, the support frame 8 stably supports the auxiliary crushing mechanism 9 and the connecting component 10 through the frame structure and reinforcing ribs. The support plate 2 ensures the installation accuracy through the positioning pins and anti-loosening bolts. The sealed bearings and dustproof structure can prevent dust from entering the equipment and affecting its service life.This device, through the aforementioned workflow, specifically addresses the core problem of "low efficiency and poor effect in crushing agglomerated materials" in the background technology. On the one hand, the elastic support pre-crushing design of the auxiliary crushing mechanism 9 can adaptively adjust the extrusion force according to the hardness of the agglomerated material, avoiding the problem of agglomerated material directly entering the main crushing mechanism and exceeding the capacity of the crushing components due to the lack of pre-crushing in traditional devices. This reduces wear on the crushing head 7 and equipment failure, eliminating the need for rework and significantly improving crushing efficiency. On the other hand, the adjustable docking and sealing design of the connecting component 10, combined with the dual-drive collaborative crushing structure of the rotating cylinder 3, with the first drive driving the material to flip and the second drive driving the crushing head 7 to precisely shear, solves the problem of incomplete crushing and material residue in traditional pre-extrusion structures. At the same time, the setting of the stirring ridge and scraper ensures uniform crushing of the material. The particle size of the final water-blocking and leak-sealing material meets the requirements of fluidity and sealing performance for downhole construction, avoiding the problem of insufficient density of the sealing layer and residual leakage channels due to uneven particle size.

[0052] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling self-expanding plugging agent, characterized in that, The drilling self-expanding plugging agent comprises the following raw materials by mass percentage: 45-52% inorganic skeleton material, 12-18% self-expanding composite component, 9-14% bridging and reinforcing composite component, 6-10% coagulation-promoting composite component, 2-5% flow-stabilizing and dispersing composite component, with the balance being deionized water; the inorganic skeleton material is composed of the following raw materials by mass percentage: 30-40% wollastonite powder, 20-28% heavy calcium carbonate, 15-22% metakaolinite, 10-16% ultrafine quartz powder, with the balance being slag powder; the self-expanding composite component is composed of the following raw materials by mass percentage: 26-32% sodium bentonite, 18-24% cross-linked sodium polyacrylate, 12-18% attapulgite, 8-12% sodium carboxymethyl cellulose, with the balance being lightly calcined magnesium oxide; the bridging and reinforcing composite component is composed of the following raw materials by mass percentage: 28-36% walnut shell powder, 1 The composite component consists of 8-24% mica flakes, 12-18% chopped basalt fiber, 8-12% nitrile rubber powder, and the balance being graphite powder; the coagulation-promoting composite component is composed of the following raw materials by mass percentage: 24-30% aluminate cement, 16-22% anhydrous gypsum, 10-16% sodium aluminate, 8-12% sodium sulfate, and the balance being calcium sulfoaluminate expanding agent; the flow-stabilizing and dispersing composite component is composed of the following raw materials by mass percentage: 30-4 The mixture contains 0% sodium lignosulfonate, 18-24% polycarboxylate superplasticizer, 8-12% silicone defoamer, and the balance is sodium citrate; the liquid absorption ratio of the cross-linked sodium polyacrylate is 80-150 times its own mass, and the length of the short-cut basalt fiber is 2-6 mm; the drilling self-expanding plugging agent is mixed at a material-to-liquid ratio of 1:0.25-0.40 and stirred at 600-900 r / min for 8-15 min.

2. The drilling self-expanding plugging agent according to claim 1, characterized in that, The processing is carried out using a crushing device, which includes an assembly base (1), a support plate (2), a rotating cylinder (3), a first drive device (4), a second drive device (5), a drive arm (6), a crushing head (7), a support frame (8), an auxiliary crushing mechanism (9), and a connecting assembly (10). The support plates (2) are symmetrically fixedly connected to the top two ends of the assembly base (1). The rotating cylinder (3) is rotatably connected to the inner walls of the two support plates (2). The first driving device (4) is installed on the outer wall of one of the support plates (2), and the output end of the first driving device (4) is fixedly connected to one end of the rotating cylinder (3). The second driving device (5) is installed on the outer wall of the other support plate (2). The driving arm (6) is rotatably connected to the eccentric part of the inner wall of the rotating cylinder (3). The output end of the second driving device (5) is fixedly connected to one end of the driving arm (6). Multiple crushing heads (7) are fixedly sleeved on the driving arm (6) at equal intervals. The support frame (8) is fixedly connected to the assembly base (1). The auxiliary crushing mechanism (9) is mounted on the support frame (8), and the auxiliary crushing mechanism (9) and the rotating cylinder (3) are connected by the connecting component (10).

3. The drilling self-expanding plugging agent according to claim 2, characterized in that, The auxiliary crushing mechanism (9) includes a conveying sleeve (91), a third drive device (92), a pressure plate (93), a support plate (94), and a connecting piece (95), wherein, The conveying sleeve (91) is fixedly connected to the top of the support frame (8), the third drive device (92) is installed on the top of the conveying sleeve (91), the output end of the third drive device (92) passes through the top of the conveying sleeve (91) and is fixedly connected to the top of the pressure plate (93). The inner wall of the conveying sleeve (91) is fixedly connected to a fixed inner plate (911), the pressure plate (93) and the support plate (94) are slidably connected to the inner wall of the fixed inner plate (911), and a connector (95) is provided between the bottom of the fixed inner plate (911) and the support plate (94), and they are connected through the connector (95).

4. The drilling self-expanding plugging agent according to claim 3, characterized in that, The connector (95) includes a support base (951), a connecting arm (952), a support sleeve (953), a support rod (954), and a support spring (955), wherein, The support base (951) is fixedly connected to the bottom of the support plate (94). One end of the plurality of connecting arms (952) is fixedly connected to the outer wall of the support base (951) in a circumferential array. The outer wall of the support sleeve (953) is fixedly connected to the other end of the connecting arm (952). One end of the support rod (954) slides through the top of the support sleeve (953). A support spring (955) is provided between one end of the support rod (954) and the bottom of the inner side of the support sleeve (953), and they are connected through the support spring (955). The other end of the support rod (954) is fixedly connected to the bottom of the fixed inner plate (911).

5. The drilling self-expanding plugging agent according to claim 3, characterized in that, The connecting assembly (10) includes a fourth driving device (101), a support arm (102), and a connecting sleeve (103), wherein, The fourth drive device (101) is installed on the top of the support frame (8). The output end of the fourth drive device (101) passes through the top of the support frame (8) and is fixedly connected to one end of the support arm (102). The outer wall of the connecting sleeve (103) is fixedly connected to the other end of the support arm (102). A corrugated pipe is provided between the connecting sleeve (103) and the discharge port of the conveying sleeve (91).

6. The drilling self-expanding plugging agent according to claim 5, characterized in that, The drive arm (6) is located at the bottom of the inner wall of the rotating cylinder (3).

7. The drilling self-expanding plugging agent according to claim 6, characterized in that, The support arm (102) has an L-shaped structure, and the outer wall of the rotating cylinder (3) is fixedly connected with an injection port. The inner wall of the connecting sleeve (103) is fitted and connected to the outer wall of the rotating cylinder (3).

8. The drilling self-expanding plugging agent according to claim 4, characterized in that, The inner wall of the support plate (2) is provided with a guide groove, and the end of the rotating cylinder (3) is rotatably engaged in the guide groove.

9. The drilling self-expanding plugging agent according to claim 3, characterized in that, Solenoid valves are installed on both the injection port and the connecting sleeve (103).

Images