High-pressure-resistant semi-closed pipe type ice layer hot melting drilling tool side wall heater and preparation method thereof

Abstract

The invention discloses a high-pressure-resistant semi-closed tubular ice layer hot melting drilling tool side wall heater and a preparation method thereof, and belongs to the technical field of polar region drilling, the high-pressure-resistant semi-closed tubular ice layer hot melting drilling tool side wall heater comprises semicircular tubular heater units arranged in pairs, and the two heater units are matched to define a complete circular tube structure; each heater unit comprises an inner side plate, an outer side plate, epoxy resin, a flexible heating film, a top cover plate and a base plate, the inner side plate and the outer side plate with semicircular cross sections are coaxially arranged, and an accommodating space is formed between the inner side plate and the outer side plate; the flexible heating film is attached to the side, facing the inner side plate, of the outer side plate. The epoxy resin is filled in the accommodating space and wraps the flexible heating film; the top cover plate is detachably connected to the top ends of the inner side plate and the outer side plate, and the base plate is detachably connected to the bottom ends of the inner side plate and the outer side plate. The method is used for preparing the side wall heater of the high-pressure-resistant semi-closed pipe type ice layer hot melting drilling tool, the side wall heater can be directly buckled on the outer wall of the hot melting drilling tool, and field operation is simple and convenient. The preparation efficiency of the side wall heater is improved, and the preparation cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of polar drilling technology, and in particular relates to a high-pressure resistant semi-closed tubular ice layer heat-melt drill sidewall heater and a preparation method thereof. Background Art

[0002] When hot-melt drill tools penetrate ice, they generate meltwater, which remains trapped within the borehole. Polar ice is cold, and without heating the sidewalls of the hot-melt drill tools, the meltwater generated during hot-melt drilling can easily freeze on the tool walls, leading to freezing and sticking accidents. This poses a significant threat to the safe and efficient operation of hot-melt drill tools. Therefore, heaters are typically installed on the sidewalls of hot-melt drill tools.

[0003] Currently, sidewall heaters for hot-melt drill tools typically use resistance wire as the heating element, and this wire is typically wound within a spiral groove in the drill tool's sidewall. This method of heating the sidewall is complex and costly to manufacture, and offers limited protection for the resistance wire. Furthermore, this process can only produce sidewall heaters in the form of round tubes, which complicates assembly with the drill tool and makes field operation difficult. Furthermore, the resistance wire's low pressure resistance makes it unsuitable for drilling deep into ice, making it difficult to meet the demands of deep ice sheet drilling. Summary of the Invention

[0004] In order to solve the problems existing in the above background technology, the purpose of the present invention is to provide a high-pressure resistant semi-closed tubular ice layer hot melt drilling tool side wall heater that can be used in polar subglacial water environment and a preparation method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions: According to the first aspect of the present invention, a high-pressure resistant semi-closed tubular ice layer hot melt drill side wall heater is proposed, comprising a pair of semi-circular tubular heater units, the two heater units cooperate to enclose a complete circular tube structure; each heater unit comprises a top cover plate, an inner plate, epoxy resin, a flexible heating film, an outer plate and a base plate, the inner plate and the outer plate with a semicircular cross-section are coaxially arranged to form a accommodating space therebetween; the flexible heating film is attached to the side of the outer plate facing the inner plate; the epoxy resin is filled in the accommodating space and covers the flexible heating film; the top cover plate is detachably connected to the top ends of the inner plate and the outer plate, and the top cover plate is provided with an outlet for the flexible heating film wires to pass through and a pouring port for pouring epoxy resin; the base plate is detachably connected to the bottom ends of the inner plate and the outer plate.

[0006] Furthermore, the flexible heating film is a silicone heating film, the length dimension of which is smaller than the axial length of the outer plate, and the circumferential width is smaller than the semicircular arc length of the outer plate.

[0007] Furthermore, the top cover plate has a mounting portion, which is provided with two rows of threaded holes, namely an upper row of screw holes and a lower row of screw holes. The top cover plate is fixedly connected to the top ends of the inner plate and the outer plate at the same time through the lower row of screw holes and fasteners, and the top cover plate is fixedly connected to the hot melt drill tool through the upper row of screw holes and fasteners.

[0008] Furthermore, the base plate has a mounting portion, and the mounting portion of the base plate is provided with two rows of threaded holes, namely an upper row of screw holes and a lower row of screw holes. The base plate is fixedly connected to the bottom ends of the inner plate and the outer plate at the same time through the upper row of screw holes and fasteners, and the base plate is fixedly connected to the hot melt drill tool through the lower row of screw holes and fasteners.

[0009] Furthermore, the inner plate and the outer plate are made of aluminum alloy.

[0010] According to a second aspect of the present invention, a method for preparing the high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool sidewall heater is proposed, characterized in that it comprises the following steps: Step 1: Process the top cover, inner tube, outer tube and base. The length of the inner tube and outer tube are the same. Prepare two flexible heating films. The length of each flexible heating film is smaller than the axial length of the outer tube, and the circumferential width is smaller than the semicircular circumference of the outer tube. The top cover is provided with six openings, including two epoxy resin injection ports, two flexible heating film outlet ports and two wire cutting processing ports; the mounting parts of the top cover and the base are both provided with two rows of threaded holes; Step 2: Glue two pieces of flexible heating film symmetrically on the inner wall of the outer tube, and assemble the top cover, inner tube, outer tube and base to form a closed annular space; Step 3: pouring epoxy resin into the closed annular space formed through the pouring port on the top cover and curing it to form a circular tube heater; Step 4: Use the wire cutting process to cut the solidified circular tubular heater along the wire cutting process to obtain two semicircular tubular heater units.

[0011] Furthermore, in step 2, the wires of the flexible heating film are led out from the wire outlet of the top cover.

[0012] Furthermore, in step 2, the inner tube is coaxially arranged in the outer tube to form an annular space, and the top cover and the base respectively seal the top and bottom ends of the annular space.

[0013] Through the above design scheme, the present invention can bring the following beneficial effects: 1. The high-pressure, semi-closed tubular ice-melt drill sidewall heater provided by this invention solves the problem of conventional flexible heating membranes being unable to operate in high-pressure environments, thereby improving their water pressure resistance. Furthermore, the inner and outer panels also protect the flexible heating membrane, improving its resistance to mechanical shock.

[0014] 2. The high-pressure resistant semi-closed tube ice layer hot melt drill tool side wall heater provided by the present invention is a semi-closed tube type, which solves the problems of complex assembly of traditional annular side wall heaters and drill tool bodies and inconvenient on-site operation. It can be directly buckled on the outer wall of the hot melt drill tool, and on-site operation is simple and convenient.

[0015] 3. The method for manufacturing a high-pressure, semi-closed-tube ice melt drill sidewall heater provided by this invention is simple, reliable, and low-cost, improving the efficiency and reducing the cost of manufacturing the sidewall heater. This method plays a significant role in promoting the development of polar ice drilling technology and glaciology research. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a single semi-circular tubular heater unit in a high-pressure resistant semi-closed tubular ice melt drilling tool sidewall heater; Figure 2 This is a schematic diagram of the epoxy resin infusion mold structure; Figure 3 This is a cross-sectional view of the epoxy resin infusion mold structure; Figure 4 This is a schematic diagram of the working status of the side wall heater of the high-pressure resistant semi-closed tubular ice layer thermal melt drilling tool; The markings in the figure are as follows: 1-top cover plate; 2-inner plate; 3-epoxy resin; 4-flexible heating film; 5-outer plate; 6-base plate; 7-first fixing screw; 8-second fixing screw. DETAILED DESCRIPTION

[0017] In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the content described in detail below is illustrative and not restrictive, and should not be used to limit the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the ordinary meanings understood by people with ordinary skills in the field to which the present invention belongs. In order to avoid confusing the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail. It should be understood that the terms "first" and "second" are only used for descriptive purposes, and the features defined as "first" and "second" do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0018] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the present invention proposes a high-pressure resistant semi-closed tubular ice layer hot melt drilling tool side wall heater, including semi-circular tubular heater units arranged in pairs, and the two heater units cooperate to enclose a complete circular tube structure; each heater unit includes a top cover plate 1, an inner plate 2, epoxy resin 3, a flexible heating film 4, an outer plate 5 and a base plate 6, and the inner plate 2 and the outer plate 5 with a semicircular cross-section are arranged coaxially to form a accommodating space between the two; the flexible heating film 4 is attached to the side of the outer plate 5 facing the inner plate 2; the epoxy resin 3 is filled in the accommodating space and covers the flexible heating film 4; the top cover plate 1 is detachably connected to the top of the inner plate 2 and the outer plate 5, and the top cover plate 1 is provided with an outlet for the wires of the flexible heating film 4 to pass through and a pouring port for pouring epoxy resin 3; the base plate 6 is detachably connected to the bottom of the inner plate 2 and the outer plate 5. Among them, the top cover plate 1 has a mounting portion, and the mounting portion of the top cover plate 1 is provided with two rows of threaded holes, namely the upper row of screw holes and the lower row of screw holes. The top cover plate 1 is fixedly connected to the top of the inner plate 2 and the outer plate 5 at the same time by the first fixing screws 7 through the lower row of screw holes. The top cover plate 1 is fixedly connected to the hot melt drill tool by the screws through the upper row of screw holes. The base plate 6 has a mounting portion, and the mounting portion of the base plate 6 is provided with two rows of threaded holes, namely the upper row of screw holes and the lower row of screw holes. The base plate 6 is fixedly connected to the bottom of the inner plate 2 and the outer plate 5 at the same time by the second fixing screws 8 through the upper row of screw holes. The base plate 6 is fixedly connected to the hot melt drill tool by the screws through the lower row of screw holes. The material of the inner plate 2 and the outer plate 5 is aluminum alloy, which has high thermal conductivity and great strength and is light in weight. It not only facilitates the heat dissipation of the flexible heating film 4, but also can withstand greater water pressure with a smaller thickness. Two independent flexible heating films 4 are used as heating elements. These are attached to the side of the outer panel 5 facing the inner panel 2. This ensures that the generated heat is directly transferred to the outer side of the outer panel 5, preventing the meltwater from freezing. The flexible heating films 4 are made of silicone, which provides good adhesion to the epoxy resin 3. The length of the flexible heating films 4 is smaller than the axial length of the outer panel 5, and the circumferential width is smaller than the semicircular arc length of the outer panel 5.

[0019] During operation, the two semi-circular tubular heater units can be directly attached to the sidewalls of the hot-melt drill, forming a complete circular tube that heats the drill's sidewalls. The semi-circular tubular heater units are screwed to the drill using the lower row of screw holes on the base plate 6 and the upper row of screw holes on the top cover plate 1. Furthermore, depending on the actual length of the hot-melt drill, multiple sets of semi-circular tubular heater units can be arranged along the drill's length to heat the entire sidewall of the drill.

[0020] The method for preparing the high-pressure resistant semi-closed tubular ice layer hot melt drilling tool side wall heater proposed by the present invention comprises the following steps: Step 1: Process the top cover, inner tube, outer tube and base, and prepare two flexible heating membranes 4. The length of the flexible heating membrane 4 is shorter than the axial length of the outer tube, and the width is less than half the circumference of the outer tube. The top cover is provided with six openings, including two injection ports for epoxy resin 3, two outlet ports for the flexible heating membrane 4 and two wire cutting processing ports. The mounting parts of the top cover and the base are both provided with two rows of threaded holes. Step 2: Paste a piece of flexible heating film 4 on the center of the left and right sides of the inner wall of the outer tube, and assemble the base, top cover, inner tube and outer tube by using the first fixing screw 7 and the second fixing screw 8 to form an epoxy resin injection mold. At the same time, ensure that the wires of the flexible heating film 4 are exposed from the top cover; Step 3: Prepare epoxy resin 3 and pour epoxy resin 3 into the epoxy resin pouring mold through the pouring port on the top cover. After pouring, wait for a while until the epoxy resin 3 solidifies. At this point, a completed round tube side wall heater is formed.

[0021] Step 4: Use the wire cutting process to cut the circular tubular side wall heater along the wire cutting opening on the top cover, just to separate the two flexible heating films 4. At this time, two semi-circular tubular heater units can be formed.

[0022] Working principle of the present invention: The present invention uses a flexible heating film 4 to heat the side wall of the hot melt drill. In order to improve the pressure resistance of the flexible heating film 4 and the simplicity of on-site operation, the flexible heating film 4 is encapsulated in epoxy resin 3 and made into a semi-closed tube form. To this end, first process a complete base, top cover, inner tube and outer tube, and symmetrically paste two flexible heating films 4 on the inner wall of the outer tube, and then use a first fixing screw 7 and a second fixing screw 8 to form a circular epoxy resin pouring mold. Then, pour the epoxy resin 3 into the epoxy resin pouring mold, wait for a period of time, and after it solidifies, use a wire cutting process to divide the circular epoxy resin pouring mold together with the solidified epoxy resin 3 into two to prepare a semi-closed tube shape. The two prepared semi-closed tube heaters are directly buckled on the outer wall of the hot melt drill and fixed to it by screws. Finally, the semi-closed tube side wall heater is powered by the hot melt drill to achieve heat generation and prevent the hot melt drill from freezing.

Claims

1. A high-pressure resistant semi-closed tube ice layer heat melt drill side wall heater, characterized in that: The invention comprises a pair of semi-circular tubular heater units, wherein the two heater units cooperate to enclose a complete circular tube structure; each heater unit comprises a top cover plate (1), an inner plate (2), epoxy resin (3), a flexible heating film (4), an outer plate (5) and a base plate (6), wherein the inner plate (2) and the outer plate (5) having a semi-circular cross section are coaxially arranged to form a receiving space therebetween; the flexible heating film (4) is attached to the side of the outer plate (5) facing the inner plate (2); the epoxy resin (3) is filled in the receiving space and covers the flexible heating film (4); the top cover plate (1) is detachably connected to the top ends of the inner plate (2) and the outer plate (5), and the top cover plate (1) is provided with an outlet for the wires of the flexible heating film (4) to pass through and an infusion port for infusing the epoxy resin (3); the base plate (6) is detachably connected to the bottom ends of the inner plate (2) and the outer plate (5).

2. The high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool sidewall heater according to claim 1, characterized in that: The flexible heating film (4) is a silicone heating film, the length dimension of which is smaller than the axial length of the outer plate (5), and the circumferential width of which is smaller than the semicircular arc length of the outer plate (5).

3. The high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool sidewall heater according to claim 1, characterized in that: The top cover plate (1) has a mounting portion, and the mounting portion of the top cover plate (1) is provided with two rows of threaded holes, namely an upper row of screw holes and a lower row of screw holes. The top cover plate (1) is fixedly connected to the top ends of the inner plate (2) and the outer plate (5) through the lower row of screw holes in conjunction with fasteners, and the top cover plate (1) is fixedly connected to the hot melt drill tool through the upper row of screw holes in conjunction with fasteners.

4. The high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool sidewall heater according to claim 1, characterized in that: The base plate (6) has a mounting portion, and the mounting portion of the base plate (6) is provided with two rows of threaded holes, namely an upper row of screw holes and a lower row of screw holes. The base plate (6) is fixedly connected to the bottom ends of the inner plate (2) and the outer plate (5) through the upper row of screw holes in conjunction with fasteners, and the base plate (6) is fixedly connected to the hot melt drill tool through the lower row of screw holes in conjunction with fasteners.

5. The high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool sidewall heater according to claim 1, characterized in that: The inner plate (2) and the outer plate (5) are made of aluminum alloy.

6. A method for preparing the high-pressure resistant semi-closed tubular ice layer heat-melt drilling tool side wall heater according to claim 1, characterized in that: The following steps are involved: Step 1: Process the top cover, inner tube, outer tube and base. The lengths of the inner tube and outer tube are the same. Prepare two flexible heating films (4). The length dimension of each flexible heating film (4) is smaller than the axial length of the outer tube, and the circumferential width is smaller than the semicircular circumference of the outer tube. The top cover is provided with six openings, including two epoxy resin (3) injection ports, two flexible heating film (4) outlet ports and two wire cutting processing ports. The mounting parts of the top cover and the base are both provided with two rows of threaded holes. Step 2: symmetrically attach two flexible heating films (4) to the inner wall of the outer tube, and assemble the top cover, inner tube, outer tube and base to form a closed annular space; Step 3: pouring epoxy resin (3) into the closed annular space formed through the pouring port on the top cover and curing it to form a circular tube heater; Step 4: Use the wire cutting process to cut the solidified circular tubular heater along the wire cutting process to obtain two semicircular tubular heater units.

7. The method for preparing a high-pressure resistant semi-closed tubular ice layer hot melt drilling tool sidewall heater according to claim 6, characterized in that: In step 2, the wires of the flexible heating film (4) are led out from the wire outlet of the top cover.

8. The method for preparing a high-pressure resistant semi-closed tubular ice layer hot melt drilling tool sidewall heater according to claim 6, characterized in that: In step 2, the inner tube is coaxially arranged in the outer tube to form an annular space, and the top cover and the base respectively seal the top and bottom ends of the annular space.

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