A device for preparing cationic emulsified asphalt for drilling fluid

Abstract

The present application relates to the technical field of asphalt preparation, and particularly relates to a cationic emulsified asphalt preparation device for drilling fluid, which comprises a kettle body, a feeding pipe is arranged on the kettle body, and further comprises a stirring and grinding mechanism, the stirring and grinding mechanism comprises an inner grinding column and an outer grinding column, an aeration mechanism is arranged on the kettle body, one end of the aeration mechanism is connected to the inside of the kettle body, the aeration mechanism enables the materials in the kettle body to move downward and concentrate, then pass through the inside of the inner grinding column and the outer grinding column, and be upwardly conveyed to return to the top of the kettle body, thereby forming a grinding cycle, the aeration mechanism is arranged, the materials in the kettle body are forced to move downward along a specific path and concentrate into a precise gap between the inner grinding column and the outer grinding column by bubble disturbance, and after grinding, the materials are upwardly conveyed to return to flow to the top of the kettle body, thereby forming a forced closed-circuit grinding system, all the materials are ensured to pass through the grinding area multiple times and repeatedly, and the asphalt particles are effectively refined to the nanometer level or the micron level.

Description

Technical Field

[0001] This invention relates to the field of asphalt preparation technology, and in particular to a device for preparing cationic emulsified asphalt for drilling fluid. Background Technology

[0002] Shale contains water-sensitive clay minerals, which are prone to hydration and expansion when exposed to water, leading to wellbore narrowing or collapse. The key to cationic emulsified bitumen lies in the positive charge carried by its particles. Since the surface of wellbore rock and clay particles usually carries a negative charge, positively charged bitumen particles can be quickly and firmly adsorbed onto the negatively charged wellbore and drill cuttings surface through the attraction of opposite charges.

[0003] Existing equipment for preparing cationic emulsified bitumen for drilling fluids has some shortcomings: the particle size distribution of cationic emulsified bitumen for drilling fluids is extremely important in order to enter the formation for plugging. Ordinary stirred tanks are unable to achieve nanoscale or microscale homogenization, which in turn affects the preparation of subsequent drilling fluids.

[0004] To address these issues, those skilled in the art have proposed a device for preparing cationic emulsified bitumen for drilling fluids. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that it is difficult to achieve nanoscale or microscale homogenization during the grinding process in a stirred tank.

[0006] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a cationic emulsified asphalt preparation device for drilling fluid, including a vessel body, wherein a feed pipe is provided on the vessel body, and further comprising: A stirring and grinding mechanism, comprising an inner grinding column and an outer grinding column; An aeration mechanism is installed on the vessel body, with one end of the aeration mechanism leading into the interior of the vessel body. The aeration mechanism causes the material inside the vessel body to move downward and concentrate, then pass through the interior of the inner and outer grinding columns, and is conveyed upward and back to the top of the vessel body, forming a grinding cycle.

[0007] As a preferred embodiment of the cationic emulsified asphalt preparation device for drilling fluid of the present invention, the stirring and grinding mechanism further includes a motor disposed on the surface of the vessel body, the bottom end of the motor output shaft is located inside the vessel body, a transmission shaft is fixed at the bottom end of the motor, a connecting seat is fixedly installed at one end of the transmission shaft, and the inner grinding column is installed at the bottom end of the connecting seat.

[0008] As a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, the stirring and grinding mechanism further includes electric cylinders disposed on both sides of the inner wall of the top of the vessel, and the outer grinding column is installed on the bottom outer wall of the electric cylinder.

[0009] In a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, the outer wall of the outer grinding column is provided with a threaded groove, and the inner circumferential wall of the outer grinding column is provided with annular grooves distributed at equal intervals.

[0010] As a preferred embodiment of the cationic emulsified bitumen preparation device for drilling fluid of the present invention, wherein: the outer circumference of the inner grinding column is provided with an annular groove one at each position of the annular groove two, and grinding balls are installed at equal intervals on the inner wall of the annular groove one, with a gap between the grinding balls and the annular groove two.

[0011] As a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, a stirring component is further provided on the bottom outer wall of the inner grinding column.

[0012] In a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, the stirring assembly includes a plurality of inclined rods installed at the bottom of the inner grinding column, one end of the inclined rods is equipped with a scraper, and the scraper is attached to the bottom inner wall of the vessel.

[0013] In a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, a connecting rod is fixedly installed on the surface of the inclined rod, an electric heating rod is vertically installed at one end of the connecting rod, and a spiral stirring rod is wound around the outside of the electric heating rod.

[0014] As a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, the aeration mechanism includes an air pump installed on the surface of the vessel body, an air pipe installed at one end of the air pump, an annular pipe installed at one end of the air pipe, the annular pipe being attached to the inner circumferential wall of the top of the vessel body, and multiple micro aeration heads being fixedly installed at equal intervals on the bottom outer wall of the annular pipe.

[0015] As a preferred embodiment of the drilling fluid cationic emulsified asphalt preparation device of the present invention, wherein: an exhaust pipe is inserted into one side of the top outer wall of the vessel body, multiple support columns are installed on the outer wall of the vessel body, and a discharge pipe is provided on the bottom outer wall of the vessel body.

[0016] The beneficial effects of the cationic emulsified bitumen preparation apparatus for drilling fluid of the present invention are as follows: This invention features an aeration mechanism on the vessel body. The agitation of air bubbles forces the material inside the vessel body to move downwards along a specific path and concentrate into the precise gap between the inner and outer grinding columns. After grinding, the material is conveyed upwards and returned to the top of the vessel body, forming a forced closed-loop grinding system. This ensures that all materials pass through the grinding zone multiple times, effectively refining asphalt particles to the nanometer or micrometer level, meeting the stringent requirements of drilling fluid for the particle size required for sealing and plugging.

[0017] The threaded grooves on the outer wall of the outer grinding column generate axial thrust when rotating, which helps the material to enter the grinding zone downwards, achieving a self-suction effect. The combination of the annular groove of the inner grinding column and the grinding ball causes the material to be subjected to both high-pressure grinding at point contact and shearing grinding at line contact when passing through, refining the asphalt particles to the nanoscale or microscale. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 This is a schematic diagram of the overall structure of a device for preparing cationic emulsified bitumen for drilling fluid.

[0019] Figure 2 This is a schematic diagram of the internal structure of a device for preparing cationic emulsified bitumen for drilling fluid.

[0020] Figure 3 This is a schematic diagram of the stirring and grinding mechanism of a cationic emulsified bitumen preparation device for drilling fluid.

[0021] Figure 4 for Figure 3 A schematic diagram of the unfolded structure.

[0022] Figure 5 This is a cross-sectional schematic diagram of the inner and outer grinding columns of a device for preparing cationic emulsified bitumen for drilling fluid.

[0023] Figure 6 This is a schematic diagram of the aeration mechanism of a device for preparing cationic emulsified bitumen for drilling fluid.

[0024] In the diagram: 1. Kettle body; 101. Feed pipe; 102. Exhaust pipe; 103. Support column; 104. Discharge pipe; 2. Aeration mechanism; 201. Air pump; 202. Vent pipe; 203. Annular pipe; 204. Miniature aeration head; 3. Stirring and grinding mechanism; 301. Motor; 302. Drive shaft; 303. Connecting seat; 304. Inner grinding column; 3041. Annular groove one; 3042. Grinding ball; 305. Electric cylinder; 306. Outer grinding column; 3061. Threaded groove; 3062. Annular groove two; 307. Stirring assembly; 3071. Inclined rod; 3072. Scraper; 3073. Connecting rod; 3074. Spiral stirring rod; 3075. Electric heating rod. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] The terminology used in this invention is that which is currently widely used in the art in view of the function of the invention. However, these terms may vary according to the intentions of those skilled in the art, precedents or new technologies in the art. In addition, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in the specification should not be construed as simple names, but rather as based on the meaning of the terms and the overall description of the invention.

[0027] Reference Figures 1 to 6 This embodiment provides a cationic emulsified bitumen preparation apparatus for drilling fluid, including a vessel body 1, on which a feed pipe 101 is provided, comprising: The stirring and grinding mechanism 3 includes an inner grinding column 304 and an outer grinding column 306. An aeration mechanism 2 is installed on the vessel body 1. One end of the aeration mechanism 2 leads into the interior of the vessel body 1. The aeration mechanism 2 causes the material inside the vessel body to move downward and concentrate. Then, it passes through the interior of the inner grinding column 304 and the outer grinding column 306, and is conveyed upward and back to the top of the vessel body 1, forming a grinding cycle.

[0028] During operation, cationic emulsified asphalt is placed inside the reactor body 1, and the stirring and grinding mechanism 3 is started to grind the material. Then, the aeration mechanism 2 is started to uniformly spray nitrogen gas. The gas presses down on the material inside the reactor body 1, forcing the material in the upper part of the reactor body 1 to flow downward along the reactor wall, thereby forming a macroscopic circulating flow field from top to bottom inside the reactor body. This pneumatic drive mechanism forces the originally randomly dispersed material to be concentrated in the bottom area.

[0029] After the material enters the bottom, it will enter the precision grinding area between the inner grinding column 304 and the outer grinding column 306. The shearing and extrusion forces formed between the two will finely grind the asphalt particles passing through. The ground material will be conveyed upward along the annular channel between the inner grinding column 304 and the outer grinding column 306 and returned to the upper space of the vessel 1. After mixing with the material above, it will be driven downward again by the aeration mechanism 2. This process is repeated to ensure that all materials pass through the precision grinding area multiple times and gradually refine them to nano- or micron-sized particle sizes, ultimately obtaining a cationic emulsified asphalt product that meets the requirements for drilling fluid.

[0030] Specifically, the stirring and grinding mechanism 3 also includes a motor 301 disposed on the surface of the vessel body 1. The bottom end of the output shaft of the motor 301 is located inside the vessel body 1, and a transmission shaft 302 is fixed at its bottom end. A connecting seat 303 is fixedly installed at one end of the transmission shaft 302, and the inner grinding column 304 is installed at the bottom end of the connecting seat 303.

[0031] Starting the motor 301 will drive the transmission shaft 302 to rotate, which in turn drives the inner grinding column 304 to rotate, thus facilitating the grinding of materials.

[0032] Furthermore, the stirring and grinding mechanism 3 also includes electric cylinders 305 disposed on both sides of the inner wall of the top of the vessel body 1, and an outer grinding column 306 is mounted on the bottom outer wall of the electric cylinders 305.

[0033] The outer grinding column 306 is located outside the inner grinding column 304. Its height can be adjusted by an electric cylinder 305. It works in conjunction with the inner grinding column 304 to form a grinding space, which facilitates the fine grinding of materials, so that the materials are gradually refined to nano- or micron-sized particles.

[0034] Among them, the outer wall of the outer grinding column 306 has a threaded groove 3061, and the inner circumference of the outer grinding column 306 has an annular groove 3062 that is evenly distributed.

[0035] It should be noted that the outer circumference of the inner grinding column 304 is provided with an annular groove 3041 at the position of the second annular groove 3062. Grinding balls 3042 are installed at equal intervals on the inner wall of the first annular groove 3041, and a gap is left between the grinding balls 3042 and the second annular groove 3062.

[0036] During the grinding process, the inner grinding column 304 rotates at high speed under the drive of the motor 301, while the outer grinding column 306 remains stationary or rotates at low speed in the opposite direction. When the material is conveyed to the annular area between the inner grinding column 304 and the outer grinding column 306 via the aeration mechanism 2, it will pass through the multi-stage grinding channel composed of the first annular groove 3041, the grinding ball 3042 and the second annular groove 3062 in sequence. When the material flows through these annular gaps, it is first subjected to point contact compression and grinding between the high-speed rotating grinding ball 3042 and the fixed annular groove wall, which breaks down large particles of asphalt. Subsequently, the material continues to pass through the annular gap shear zone between the grinding ball 3042 and the second annular groove 3062, where it is subjected to strong shearing force, further refining the particles.

[0037] Specifically, a stirring assembly 307 is also provided on the bottom outer wall of the inner grinding column 304.

[0038] Furthermore, the stirring assembly 307 includes a plurality of inclined rods 3071 installed at the bottom of the inner grinding column 304, and a scraper 3072 is installed at one end of the inclined rods 3071, the scraper 3072 being attached to the bottom inner wall of the vessel body 1.

[0039] The inclined rod 3071 is installed at an inclined angle at the bottom of the inner grinding column 304. As it rotates, it generates a combined axial and radial stirring force, which pushes the material at the bottom of the vessel 1 to converge towards the central area, ensuring that the material at the bottom remains in a flowing state and preventing high-viscosity asphalt from forming a stagnant zone at the bottom of the vessel due to gravity.

[0040] Among them, a connecting rod 3073 is fixedly installed on the surface of the inclined rod 3071, an electric heating rod 3075 is vertically installed at one end of the connecting rod 3073, and a spiral stirring rod 3074 is wound around the outside of the electric heating rod 3075.

[0041] When the electric heating rod 3075 is energized, it generates heat, which directly heats the surrounding asphalt material. Since asphalt is a high-viscosity material with poor thermal conductivity, relying solely on heat transfer from the reactor wall can easily lead to uneven heating and localized overheating.

[0042] The spiral stirring rod 3074 is tightly wound around the outside of the electric heating rod 3075. As it rotates, it continuously scrapes and turns the material layer that is close to the surface of the heating rod, promptly carrying the heated material away from the heating zone and pushing it to a distance. At the same time, it continuously transports the cold material from a distance to the vicinity of the heating rod, forming a forced convection heat exchange cycle, which significantly improves heating efficiency and temperature uniformity.

[0043] It should be noted that the aeration mechanism 2 includes an air pump 201 installed on the surface of the vessel body 1. An air pipe 202 is installed at one end of the air pump 201, and an annular pipe 203 is installed at one end of the air pipe 202. The annular pipe 203 is attached to the inner circumferential wall of the top of the vessel body 1, and multiple micro aeration heads 204 are fixedly installed at equal intervals on the bottom outer wall of the annular pipe 203.

[0044] First, the air pump 201 is started. The compressed air generated by the air pump 201 is delivered to the annular pipe 203 through the air pipe 202, forming an annular air channel around the inner wall of the vessel body 1. After the compressed air enters the annular pipe 203, it is evenly distributed to each outlet and finally sprayed out simultaneously from multiple micro aerators 204 that are fixedly installed at equal intervals on the bottom outer wall of the annular pipe 203. This generates a large number of micro bubbles in the vessel body 1, forcing the material in the upper part of the vessel body 1 to flow downward along the vessel wall, thereby establishing a forced circulation flow field from top to bottom inside the vessel body 1.

[0045] Among them, an exhaust pipe 102 is inserted into one side of the top outer wall of the vessel body 1, multiple support columns 103 are installed on the outer wall of the vessel body 1, and a discharge pipe 104 is provided on the bottom outer wall of the vessel body 1.

[0046] In use, the cationic emulsified asphalt material is fed into the interior of the reactor body 1 through the feed pipe 101, and then the stirring and grinding mechanism 2 is started. The material is stirred by the scraper 3072 and the spiral stirring rod 3074, and the electric heating rod 3075 is started to heat the material.

[0047] Then, the air pump 201 is started, and the compressed air generated is delivered to the annular pipe 203 through the air pipe 202. Finally, it is evenly sprayed out from multiple micro aeration heads 204, generating a large number of micro bubbles in the vessel body 1. This forces the material in the upper part of the vessel body 1 to flow downward along the vessel wall, thereby establishing a forced circulation flow field from top to bottom inside the vessel body 1.

[0048] After the material is concentrated and transported to the bottom of the vessel 1 by the aeration mechanism 2, it enters the precision grinding area between the inner grinding column 304 and the outer grinding column 306. At this time, the motor 301 drives the transmission shaft 302 to drive the inner grinding column 304 to rotate at high speed, while the outer grinding column 306 remains stationary or rotates at low speed in the opposite direction under the drive of the electric cylinder 305. The material passes through the multi-stage grinding channel composed of the first annular groove 3041, the grinding ball 3042 and the second annular groove 3062 in sequence. First, it is subjected to point contact compression and grinding between the high-speed rotating grinding ball 3042 and the fixed annular groove wall, which breaks down the large particles of asphalt. Then, it continues to pass through the annular gap shear zone between the grinding ball 3042 and the second annular groove 3062, where it is subjected to strong shear force to further refine the particles.

[0049] Through the continuous action of multiple annular layers, the asphalt particles are gradually refined from the macroscopic scale to the nanoscale or microscale scale. The ground material is transported upward along the annular channel between the inner grinding column 304 and the outer grinding column 306, and returns to the upper space of the kettle body 1. After mixing with the material above, it is driven downward by the aeration mechanism 2 to form a cycle, and the material is repeatedly ground.

[0050] The qualified product after grinding and emulsification is discharged through the discharge pipe 104 at the bottom of the reactor body 1. The light component volatiles generated during the entire preparation process are discharged in time through the exhaust pipe 102 to ensure stable pressure inside the reactor.

[0051] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for preparing cationic emulsified bitumen for drilling fluid, comprising a vessel body (1), wherein a feed pipe (101) is provided on the vessel body (1), characterized in that: Also includes: The stirring and grinding mechanism (3) includes an inner grinding column (304) and an outer grinding column (306). An aeration mechanism (2) is installed on the vessel body (1). One end of the aeration mechanism (2) leads into the interior of the vessel body (1). The aeration mechanism (2) causes the material inside the vessel body to move downward and concentrate, and then pass through the interior of the inner grinding column (304) and the outer grinding column (306), and is conveyed upward and back to the top of the vessel body (1) to form a grinding cycle.

2. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 1, characterized in that: The stirring and grinding mechanism (3) also includes a motor (301) disposed on the surface of the vessel body (1). The bottom end of the output shaft of the motor (301) is located inside the vessel body (1), and a transmission shaft (302) is fixed at its bottom end. A connecting seat (303) is fixedly installed at one end of the transmission shaft (302), and the inner grinding column (304) is installed at the bottom end of the connecting seat (303).

3. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 2, characterized in that: The stirring and grinding mechanism (3) also includes electric cylinders (305) disposed on both sides of the inner wall of the top of the vessel body (1), and the outer grinding column (306) is installed on the bottom outer wall of the electric cylinder (305).

4. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 3, characterized in that: The outer wall of the outer grinding column (306) has a threaded groove (3061), and the inner circumference of the outer grinding column (306) has an annular groove (3062) that is evenly distributed.

5. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 4, characterized in that: The outer circumference of the inner grinding column (304) is provided with an annular groove (3041) at the position of the annular groove (3062). Grinding balls (3042) are installed at equal intervals on the inner wall of the annular groove (3041), and a gap is left between the grinding balls (3042) and the annular groove (3062).

6. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 2, characterized in that: A stirring assembly (307) is also provided on the bottom outer wall of the inner grinding column (304).

7. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 6, characterized in that: The stirring assembly (307) includes a plurality of inclined rods (3071) installed at the bottom of the inner grinding column (304), and a scraper (3072) is installed at one end of the inclined rods (3071), the scraper (3072) being attached to the bottom inner wall of the vessel body (1).

8. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 7, characterized in that: A connecting rod (3073) is fixedly installed on the surface of the inclined rod (3071). An electric heating rod (3075) is vertically installed at one end of the connecting rod (3073). A spiral stirring rod (3074) is wound around the outside of the electric heating rod (3075).

9. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 1, characterized in that: The aeration mechanism (2) includes an air pump (201) installed on the surface of the vessel body (1). One end of the air pump (201) is equipped with an air pipe (202), and one end of the air pipe (202) is equipped with an annular pipe (203). The annular pipe (203) is attached to the inner circumference of the top of the vessel body (1), and multiple micro aeration heads (204) are fixedly installed at equal intervals on the bottom outer wall of the annular pipe (203).

10. The apparatus for preparing cationic emulsified bitumen for drilling fluid as described in claim 1, characterized in that: An exhaust pipe (102) is inserted into one side of the top outer wall of the vessel body (1), a plurality of support columns (103) are installed on the outer wall of the vessel body (1), and a discharge pipe (104) is provided on the bottom outer wall of the vessel body (1).

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