Quick hot melt sampling system for frozen soil region
By using a local heating rapid thermal fusion sampling system in permafrost regions, the problems of high energy consumption and sample disturbance in permafrost sampling have been solved, achieving efficient and low-energy sample acquisition and ensuring the originality and representativeness of the samples.
Patent Information
- Application Number
- CN202511323123.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2025-12-02
AI Technical Summary
Existing technologies for sampling in permafrost regions suffer from high energy consumption, severe equipment wear and tear, and sample disturbance, resulting in samples that are not representative.
A rapid thermal fusion sampling system for frozen soil regions using localized heating is employed. This system uses a drill bit heating element to locally heat the frozen soil, reducing drilling resistance, and utilizes a sampling pump and closed pipelines to ensure the originality of the samples.
It significantly reduces equipment energy consumption and mechanical wear, improves sampling efficiency, ensures the originality and representativeness of samples, and provides high-quality data for geological research and paleoenvironmental analysis.
Smart Images
Figure CN121048955A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of frozen soil sampling technology, and more specifically, to a rapid thermal fusion sampling system for frozen soil areas. Background Technology
[0002] Permafrost regions contain important geological information, mineral resources, and paleoenvironmental samples crucial for studying climate change. However, obtaining high-quality, undisturbed fluid and soil samples from permafrost has always been a significant technical challenge.
[0003] In related technologies, conventional drilling sampling techniques have several inherent drawbacks in this field. First, when drilling in hard permafrost below -20°C, the torque required by the drill bit increases dramatically, leading to extremely high energy consumption of the drilling equipment. Furthermore, the drill string is highly susceptible to wear or damage due to overload, resulting in low operational efficiency. More critically, the frictional heat generated during traditional drilling melts the ice crystals around the drill bit, creating localized water flow. This meltwater seeps laterally and disturbs the permafrost environment in different surrounding layers, altering its original physical structure, hydrochemical balance, and temperature field. Consequently, the samples taken lose their representativeness of the original geological environment. Summary of the Invention
[0004] The present invention aims to at least partially solve one of the technical problems in the related art.
[0005] Therefore, embodiments of the present invention propose a rapid thermal fusion sampling system for permafrost regions, which can reduce sampling difficulty and ensure sample quality.
[0006] A rapid thermal thawing sampling system for permafrost regions according to an embodiment of the present invention includes: A drilling rig assembly, the drilling rig assembly including a drill bit and a drill rod, the drill bit being connected to the drill rod, the drill bit having a sampling groove, the sampling groove being located inside the drill bit and the opening of the sampling groove being located on the surface of the drill bit; A temperature regulating assembly, the temperature regulating assembly including a heating element connected to the drill bit, the heating element being used to heat the drill bit; A sampling assembly, comprising a sampling pump and a sampling pipeline, wherein a first end of the sampling pipeline is connected to the sampling tank and a second end of the sampling pipeline is connected to the sampling pump, and the sampling pump is used to extract samples from the sampling tank.
[0007] The rapid thermal thawing sampling system for permafrost regions described in this invention reduces drilling resistance through localized heating, significantly decreasing equipment energy consumption and mechanical wear, and improving operational efficiency in extremely low-temperature permafrost environments. It avoids sample disturbance caused by frictional heat and seepage in traditional drilling, ensuring the originality and representativeness of fluid and soil samples, and providing high-quality data for geological research, resource exploration, and paleoenvironmental analysis. Furthermore, by utilizing drilling, heating, and sampling functions, the heating power and sampling speed can be adjusted according to formation conditions to adapt to permafrost layers of varying depths and hardness.
[0008] In some embodiments, the heating element includes a heating section and a heating band, the heating band being arranged circumferentially around the drill bit along the centerline of the drill bit, the heating section being connected to the heating band to provide the energy required by the heating band.
[0009] In some embodiments, the rapid thermal fusion sampling system for frozen soil areas according to the present invention further includes a filter element adapted to the sampling groove, wherein the sampling groove is arranged to overlap with the heating belt in the extension direction of the drill bit.
[0010] In some embodiments, the sampling assembly further includes a sampling section placed inside the drill pipe. The sampling section includes a heat-insulating shell with a sampling cavity inside. The sampling cavity is connected to the sampling groove via a connecting pipe, and the first end of the sampling pipe is in communication with the sampling cavity.
[0011] In some embodiments, the temperature regulating assembly further includes a cooling element connected to the sampling tank, the cooling element being used to introduce cooling fluid into the sampling tank.
[0012] In some embodiments, the cooling component includes a cooling section and a cooling pipe, the cooling pipe is provided with a first control valve, the connecting pipe is provided with a second control valve, and the cooling pipe is connected to the connecting pipe and located upstream of the second control valve.
[0013] In some embodiments, the temperature regulating assembly further includes a temperature regulating element, the temperature regulating element including a first temperature regulating section, the first temperature regulating section being connected to the sampling section and arranged circumferentially along the sampling section, the first temperature regulating section being used to introduce a circulating medium to regulate the temperature of the first temperature regulating section.
[0014] In some embodiments, the temperature regulating component further includes a second temperature regulating section connected to the sampling section. In the length direction of the drill rod, the second temperature regulating section is located above the sampling section and is connected to the first temperature regulating section. The circulating medium is used to circulate between the first temperature regulating section and the second temperature regulating section.
[0015] In some embodiments, the length of the sampling section is less than the length of the second temperature regulating section in the longitudinal direction of the drill pipe.
[0016] In some embodiments, the temperature regulating assembly further includes a first detection element and a second detection element. The first detection element is disposed in the sampling chamber for detecting the sample state in the sampling chamber, and the second detection element is disposed in the second temperature regulating section for detecting the temperature of the circulating medium in the second temperature regulating section. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the rapid thermal thawing sampling system for frozen soil regions according to an embodiment of the present invention.
[0018] Figure 2 This is a partial structural schematic diagram of the rapid thermal thawing sampling system for permafrost regions according to an embodiment of the present invention.
[0019] Figure label: 1. Drilling rig components; 11. Drill bit; 111. Sampling slot; 12. Drill rod. 2. Temperature control components, 21. Heating element, 211. Heating belt, 22. Cooling components, 221. Cooling pipes. 23. Temperature regulating component; 231. First temperature regulating section; 232. Second temperature regulating section. 241. First control valve; 242. Second control valve; 251. First inspection piece; 252. Second inspection piece. 3. Sampling assembly; 31. Sampling section; 311. Insulation shell; 312. Sampling chamber; 313. Sampling pipeline; 314. Connecting pipeline. 4. Filter components. Detailed Implementation
[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0021] like Figure 1 and Figure 2 As shown, the rapid thermal thawing sampling system for frozen soil areas according to an embodiment of the present invention includes: a drilling rig assembly 1, a temperature regulation assembly 2, and a sampling assembly 3.
[0022] Drilling assembly 1 includes a drill bit 11 and a drill rod 12, with the drill bit 11 connected to the drill rod 12. The drill bit 11 has a sampling slot 111, which is located inside the drill bit 11 and its opening is located on the surface of the drill bit 11. Temperature control assembly 2 includes a heating element 21, which is connected to the drill bit 11 and is used to heat the drill bit 11. Sampling assembly 3 includes a sampling pump and a sampling pipeline 313, with a first end connected to the sampling slot 111 and a second end connected to the sampling pump. The sampling pump is used to extract samples from the sampling slot 111.
[0023] Specifically, such as Figure 1 and Figure 2 As shown, the drill bit 11 is directly connected to the drill rod 12, forming the core mechanical structure of the drilling system. The sampling slot 111 is located inside the drill bit 11, with its opening on the surface of the drill bit 11, ensuring that the sample can directly enter the sampling slot 111. The heating element 21 is directly connected to the drill bit 11 and is typically integrated inside the drill bit 11 through an embedded design (such as a heating wire or heat conduction element). The first end of the sampling conduit 313 is connected to the sampling slot 111, ensuring that the sample can directly enter the conduit from the sampling slot 111. The second end of the sampling conduit 313 is connected to the sampling pump, which extracts the sample through negative pressure.
[0024] Understandably, by integrating the sampling slot 111 inside the drill bit 11, undisturbed samples can be directly captured, avoiding sample contamination or mixing caused by the rotation and friction of the drill bit 11 in traditional drilling. The rigid connection between the drill bit 11 and the drill rod 12 ensures the stability of the drilling process, suitable for hard permafrost environments. The heating element 21 can precisely control the temperature of the drill bit 11, producing a localized instantaneous heating effect when it comes into contact with the permafrost, melting the ice crystals around the drill bit 11, thereby significantly reducing the torque required for drilling. By reducing mechanical friction and energy consumption, equipment wear and overload risks are effectively reduced, and drilling efficiency is improved. Localized heating avoids the widespread melting of ice layers caused by frictional heat in traditional drilling, thus preventing lateral seepage and sample disturbance.
[0025] The sampling pump can quickly extract samples, reducing the residence time of samples in the sampling tank 111 and avoiding changes in sample properties due to temperature changes or external environmental interference. The closed sampling pipeline 313 design ensures that the sample is sealed throughout the entire process from the drill bit 11 to the collection container, preventing external contamination or volatilization loss. Combined with the local heating of the temperature regulation component 2, the sampling component 3 can complete the sample extraction at the moment the ice crystals melt, preserving the original physical structure, water chemical balance, and temperature field of the sample to the greatest extent.
[0026] In other words, the rapid thermal thawing sampling system for permafrost regions in this invention reduces drilling resistance through localized heating, significantly reducing equipment energy consumption and mechanical wear, and improving operational efficiency in extremely low-temperature permafrost environments. It avoids sample disturbance caused by frictional heat and seepage in traditional drilling, ensuring the originality and representativeness of fluid and soil samples, and providing high-quality data for geological research, resource exploration, and paleoenvironmental analysis. Furthermore, by utilizing drilling, heating, and sampling functions, the heating power and sampling speed can be adjusted according to formation conditions to adapt to permafrost layers of different depths and hardness.
[0027] In some embodiments, the heating element 21 includes a heating section and a heating band 211, the heating band 211 being arranged circumferentially around the drill bit 11 along the center line of the drill bit 11, and the heating section being connected to the heating band 211 to provide the energy required by the heating band 211.
[0028] Specifically, such as Figure 1 and Figure 2 As shown, the heating band 211 is arranged in a circumferential manner around the outer periphery of the drill bit 11, winding circumferentially along its centerline. This ensures that the heating band 211 can evenly cover the sidewalls of the drill bit 11. The heating element is directly connected to the heating band 211. Optionally, the heating element can be a core heating element (such as a high-density resistance wire) and a temperature control unit integrated inside the drill pipe 12 or the drill bit 11. Energy (electricity) is transmitted to the heating element through a cable passing through the drill pipe 12, and then converted into heat energy by the heating element and supplied to the heating band 211.
[0029] It is understandable that, such as Figure 1 and Figure 2 As shown, the heating band 211 can be arranged in a spiral shape on the drill bit 11. The circumferentially surrounding heating band 211 can form a very uniform annular heating area around the drill bit 11, ensuring that the frozen soil around the drill bit 11 is melted synchronously and uniformly, forming a regular "melt crust". This avoids the drill bit 11 from deflecting due to uneven heating, ensuring the verticality of the borehole and the stability of drilling. At the same time, the uniform thermal field can most effectively reduce the frictional resistance of the entire circumference of the drill bit 11.
[0030] In other words, before or simultaneously with the rotation and lowering of the drill bit 11, the heating belt 211 preheats or synchronously heats the frozen soil in contact with it, causing it to melt instantly. This drastically reduces the required torque, thereby protecting the drill bit and significantly reducing drilling energy consumption.
[0031] Furthermore, heat is concentrated at the interface between the drill bit 11 and the formation, resulting in high energy utilization. The heating element, acting as the control core, can precisely regulate the temperature of the heating zone 211 to prevent overheating. Precise temperature control ensures that the heat is just sufficient to melt ice crystals without overheating, which could cause the sampled fluid to boil, vaporize, or undergo a chemical reaction, thus preserving the original chemical properties of the sample.
[0032] In some embodiments, the rapid thermal thawing sampling system for frozen soil areas according to this invention further includes a filter element 4, which is adapted to the sampling groove 111, in the extension direction of the drill bit 11 (e.g., Figure 1 In the vertical direction, the sampling groove 111 is arranged to overlap with the heating belt 211.
[0033] It is understandable that, such as Figure 1 and Figure 2 As shown, the filter element 4 (such as a filter screen, porous sintered material, etc.) is adapted inside the sampling groove 111. The filter element 4 can be an internal bushing or an embedded structure of the sampling groove 111, which fits tightly against the inner wall of the sampling groove 111 to form a whole. The sample must pass through the filter element 4 to enter the cavity of the sampling groove 111.
[0034] The sampling groove 111 and the heating element are arranged to overlap vertically, such that the projection of the heating band 211 (e.g., circumferential heating band 211) in the vertical axis covers the area where the sampling groove 111 is located. The heat generated by the heating element 21 directly acts on the entire annular area containing the sampling groove 111, so that the frozen soil at the opening of the sampling groove 111 is melted synchronously and efficiently.
[0035] In other words, the opening of sampling trough 111 will not be blocked by the still-frozen soil due to being in an unheated "cold zone". Heat energy is delivered directly to the sampling point, ensuring that there is always a flowable liquid sample at the inlet of sampling trough 111 when sampling is needed, and the sample can be extracted immediately as soon as the sampling pump is started.
[0036] In some embodiments, the sampling assembly 3 further includes a sampling section 31, which is placed inside the drill rod 12. The sampling section 31 includes a heat insulation shell 311, and the heat insulation shell 311 has a sampling cavity 312 inside. The sampling cavity 312 is connected to the sampling groove 111 through a connecting pipe 314, and the first end of the sampling pipe 313 is connected to the sampling cavity 312.
[0037] Specifically, such as Figure 1 and Figure 2 As shown, the sampling section 31 is completely placed inside the drill rod 12, and is enclosed and protected by the drill rod 12, and is lowered to the bottom of the hole together with the drill rod 12. The interior of the heat-insulating shell 311 is a sampling chamber 312 (a cavity for temporary sample storage), which is connected to the sampling groove 111 at the drill bit 11 via a connecting pipe 314. In this way, after the sample flows out from the sampling groove 111, it first enters the sampling chamber 312 through the connecting pipe 314.
[0038] It is understandable that, such as Figure 1 and Figure 2As shown, the sampling chamber 312 is arranged adjacent to the drill bit 11 and close to the sampling point. After the sample is extracted, it immediately enters the sampling chamber 312, instead of being directly drawn to the ambient temperature ground. Thus, the insulation shell 311 effectively isolates the geothermal heat and the heat generated during drilling, allowing the sample in the sampling chamber 312 to maintain its original formation temperature to the maximum extent.
[0039] Furthermore, for volatile components (such as light hydrocarbons like methane and certain inert gases) or pressure-sensitive components that may be present in permafrost areas, in-situ temporary storage avoids boiling, vaporization, exsolution, or formation of gas hydrates caused by temperature increases and pressure decreases during the lifting process. This ensures the authenticity of the sample's phase composition.
[0040] In some embodiments, the temperature regulating assembly 2 further includes a cooling element 22, which is connected to the sampling tank 111 and is used to introduce cooling fluid into the sampling tank 111.
[0041] Specifically, such as Figure 1 and Figure 2 As shown, the cooling element 22 is directly connected to the sampling tank 111. Alternatively, the cooling element 22 and the sampling tank 111 can be connected via a microfluidic channel (coil or jacket) embedded in the drill bit 11 or the wall of the sampling tank 111. The cooling element 22 needs to be connected to a ground-based cooling fluid source (such as ambient temperature water, argon, or cooling air generated by a refrigeration unit) and a pump control unit via additional cooling fluid delivery piping.
[0042] Understandably, during drilling, the use of cooling element 22 to introduce fluids such as argon into sampling groove 111 can protect or cool the drill bit 11, keeping the temperature around the drill bit 11 within a reasonable range (preferably 50~70℃), and preventing excessive heat generated by friction during use from having a significant impact on the frozen soil around the drill bit 11.
[0043] In addition, cooling can also backflush the filter element 4, thereby cleaning the filter element 4 and preventing the filtration effect of the filter element 4 from decreasing due to excessive impurities in the sample during use.
[0044] In some embodiments, the cooling component 22 includes a cooling section and a cooling pipe 221. The cooling pipe 221 is provided with a first control valve 241, and the connecting pipe 314 is provided with a second control valve 242. The cooling pipe 221 is connected to the connecting pipe 314 and is located upstream of the second control valve 242.
[0045] Specifically, such as Figure 1 and Figure 2As shown, the cooling section serves as the source of the cooling fluid. A cooling pipe 221 extends downwards from the cooling section into the drill pipe 12. A first control valve 241 is provided on the cooling pipe 221 to control the delivery of the cooling fluid. A second control valve 242 is provided on the connecting pipe 314 to isolate or connect the sampling tank 111 and the sampling chamber 312.
[0046] It is understandable that the cooling pipe 221 is connected to the connecting pipe 314 inside the drill rod 12, and the connection point between the cooling pipe 221 and the connecting pipe 314 is located upstream of the second control valve 242. That is, from the perspective of the sample flow direction (the sample flows from the sampling tank 111 to the sampling chamber 312), when the cooling fluid is introduced into the sampling tank 111 from the cooling section, the second control valve 242 can be closed first to prevent the cooling fluid from flowing into the sampling chamber 312 through the connecting pipe 314. Correspondingly, during the sampling process, the first control valve 241 is closed to prevent the sample from flowing into the cooling section and to prevent sample contamination.
[0047] In some embodiments, the temperature regulating component 2 further includes a temperature regulating element 23, which includes a first temperature regulating part 231. The first temperature regulating part 231 is connected to the sampling part 31 and arranged circumferentially along the sampling part 31. The interior of the first temperature regulating part 231 is used to introduce a circulating medium to regulate the temperature of the first temperature regulating part 231.
[0048] Specifically, such as Figure 1 and Figure 2 As shown, the first temperature regulating part 231 is physically connected to the insulation shell 311 of the sampling part 31. The first temperature regulating part 231 is arranged circumferentially around the sampling part 31. Optionally, the first temperature regulating part 231 can be a sleeve or a sandwich layer, wrapping around the periphery of the sampling part 31. Alternatively, the first temperature regulating part 231 can be arranged spirally around the insulation shell 311.
[0049] Understandably, the first temperature control unit 231 is designed with a fluid channel for introducing a circulating medium (such as antifreeze, refrigerant, or hot oil). The first temperature control unit 231 needs to be connected to the ground temperature control unit (a circulator with heating and cooling functions) through an additional circulation pipeline to form a closed circulation loop.
[0050] In other words, the circulating medium flows within the circumferentially arranged first temperature-regulating section 231, enabling uniform heating or cooling of the sample within the sampling chamber 312 from all directions. This avoids localized overheating or undercooling of the sample caused by unidirectional heating / cooling, ensuring high temperature uniformity within the sampling chamber 312. This is crucial for obtaining samples with consistency and representativeness. The ground-based temperature control unit can be programmed precisely to make the sample temperature infinitely close to or even completely reproduce the temperature of the original formation, enabling "in-situ experiments" with the highest level of fidelity.
[0051] In some embodiments, the temperature regulating member 23 further includes a second temperature regulating part 232, which is connected to the sampling part 31. In the length direction of the drill rod 12, the second temperature regulating part 232 is located above the sampling part 31. The second temperature regulating part 232 is connected to the first temperature regulating part 231, and the circulating medium is used to circulate between the first temperature regulating part 231 and the second temperature regulating part 232.
[0052] Specifically, such as Figure 1 and Figure 2 As shown, the lower end of the second temperature regulating unit 232 and the upper end of the sampling unit 31 can be connected by means of threaded connection or welding. In the vertical direction, the second temperature regulating unit 232 is located directly above the sampling unit 31. The second temperature regulating unit 232 and the first temperature regulating unit 231 are connected through an internal flow channel, so that the circulating medium can form a closed circulation loop between the two.
[0053] Understandably, by precisely controlling the temperature of the second temperature-regulating unit 232 to be the same as the temperature of the stratum at its depth, it effectively blocks the upward diffusion of heat from below and prevents the downward intrusion of cold energy from above. This creates an axially thermally isolated environment for the sampling chamber 312 enclosed by the first temperature-regulating unit 231.
[0054] Furthermore, the two temperature control units are connected in series in the same loop. The second temperature control unit 232 can adjust the temperature of its internal circulating medium based on the temperature feedback from the circulating medium in the first temperature control unit 231, ensuring that the circulating medium flowing into the first temperature control unit 231 always maintains the required temperature range for the sample. Even if the local function of one temperature control unit deteriorates, the other temperature control unit can still provide a certain degree of compensation, thus enhancing the overall temperature control reliability of the system.
[0055] Preferably, in the length direction of the drill pipe 12, the length of the sampling section 31 is less than the length of the second temperature regulating section 232. It is understood that, as... Figure 1 and Figure 2 As shown, the length of the sampling section 31 is less than the length of the second temperature regulating section 232, so that the area covered by the second temperature regulating section 232 is greater than the area covered by the sampling section 31. While increasing the temperature regulating area, it can also provide the first temperature regulating section 231 with the required circulating heat exchange medium.
[0056] It should be noted that the second temperature regulating unit 232 has a temperature regulating inlet and a temperature regulating outlet. The temperature regulating inlet is used to introduce a circulating medium. The temperature of the circulating medium can be introduced into the second temperature regulating unit 232 after the ground has been heated or cooled. Alternatively, the temperature of the circulating medium in the second temperature regulating unit 232 can be adjusted by using a heating component (such as an electric heating wire) or a cooling component (such as a cooler).
[0057] In some embodiments, the temperature regulating component 2 further includes a first detection element 251 and a second detection element 252. The first detection element 251 is disposed in the sampling chamber 312 for detecting the sample state in the sampling chamber 312. The second detection element 252 is disposed in the second temperature regulating section 232 for detecting the temperature of the circulating medium in the second temperature regulating section 232.
[0058] Understandably, the first detection element 251 (which can be one or more of a temperature sensor, pressure sensor, optical sensor, or even an ultrasonic probe) is directly located inside the sampling chamber 312. Its signal line is connected to the ground control system through internal wiring of the drill rod 12.
[0059] The second detection element 252 (such as a temperature sensor) is located within the second temperature control unit 232 and is used to directly monitor the temperature of the circulating medium flowing through it. Its signal line is also connected to the ground-based main control system. The first detection element 251 and the second detection element 252 transmit real-time detection signals to the main control system. Based on these feedback signals, the main control system dynamically adjusts the temperature control host (heating / cooling power, circulating pump flow rate, etc.), thereby forming a complete closed-loop control circuit.
[0060] During use, in the drilling phase: Turn on the heating element 211 of drill bit 11 to rapidly heat its temperature. When the temperature reaches the specified level (e.g., 50°C), drill downwards quickly. During drilling, turn on the cooling element 22 and inject protective gas (e.g., argon) into the sampling slot 111 of drill bit 11 through the cooling pipe 221 to protect the cutting edge of drill bit 11. When drill bit 11 reaches the ground, the high temperature at the front melts the moisture in the frozen soil, protecting the cutting edge of drill bit 11. At this point, the cooling element 22 can be turned off and the injection of protective gas can be stopped. If the temperature of drill bit 11 becomes too high during drilling, the cooling element 22 can be turned on again to inject cooling fluid (e.g., water) into the ground to cool drill bit 11 and maintain its temperature. The temperature of drill bit 11 remains within a reasonable range (e.g., 50~70℃) until drilling reaches the designated formation depth (cooling element 22 is closed when no fluid is injected). During injection, the injected fluid cleans the filter element 4. During drilling, the second temperature regulating unit 232 injects cooling fluid into the first temperature regulating unit 231 to reduce the temperature of the wellbore wall. When the designated depth is reached, the heating band 211 of drill bit 11 is closed, and room temperature fluid is injected into the second temperature regulating unit 232. The cooling fluid in the second temperature regulating unit 232 is discharged through the temperature regulating outlet. Once the temperature reaches room temperature, the second detection element 252 in the second temperature regulating unit 232 detects the temperature and stops the injection, ending the drilling phase. Sampling Stage: After reaching the designated depth of the formation, the temperature of the first temperature control unit 231 is adjusted according to the temperature sensor of the second temperature control unit 232. After the drill bit 11 cools down for a few minutes, the sampling unit 31 is opened to extract the formation fluid sample. The formation fluid sample slowly enters the sampling chamber 312 through the connecting pipe 314. The temperature of the first temperature control unit 231 is continuously changed according to the temperature sensor in the drill bit 11, the first detection element 251 and the second detection element 252 until the temperature is relatively stable. Then, the valve on the sampling pipe 313 is opened to extract the sample from the ground. The sample in the sampling chamber 312 reaches the ground through the sampling pipe 313. The first detection element 251 in the sampling chamber 312 monitors the change of fluid composition in the sampling chamber 312. When the sampling chamber 312 is evacuated, the valve on the sampling pipe 313 is closed to end the sampling state.
[0061] Drilling stage: Raise drilling rig assembly 1 and turn on cooling component 22. Inject a small amount of hot steam into the formation through cooling component 22 to prevent drill bit 11 from contacting the well wall and to prevent drill bit 11 from freezing and getting stuck on the well wall during the lifting process. After the thermal fusion sampling system reaches the ground, close all valves and stop the device.
[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0066] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A rapid thermal thawing sampling system for permafrost regions, characterized in that, include: A drilling rig assembly, the drilling rig assembly including a drill bit and a drill rod, the drill bit being connected to the drill rod, the drill bit having a sampling groove, the sampling groove being located inside the drill bit and the opening of the sampling groove being located on the surface of the drill bit; A temperature regulating assembly, the temperature regulating assembly including a heating element connected to the drill bit, the heating element being used to heat the drill bit; A sampling assembly, comprising a sampling pump and a sampling pipeline, wherein a first end of the sampling pipeline is connected to the sampling tank and a second end of the sampling pipeline is connected to the sampling pump, and the sampling pump is used to extract samples from the sampling tank.
2. The rapid thermal thawing sampling system for permafrost regions according to claim 1, characterized in that, The heating element includes a heating section and a heating band, the heating band being arranged circumferentially around the drill bit along the centerline of the drill bit, and the heating section being connected to the heating band to provide the energy required by the heating band.
3. The rapid thermal thawing sampling system for permafrost regions according to claim 2, characterized in that, It also includes a filter element adapted to the sampling slot, which is arranged to coincide with the heating band in the extension direction of the drill bit.
4. The rapid thermal thawing sampling system for permafrost regions according to any one of claims 1-3, characterized in that, The sampling assembly further includes a sampling section, which is placed inside the drill pipe. The sampling section includes a heat-insulating shell, and the heat-insulating shell has a sampling cavity inside. The sampling cavity is connected to the sampling groove through a connecting pipe, and the first end of the sampling pipe is connected to the sampling cavity.
5. The rapid thermal thawing sampling system for permafrost regions according to claim 4, characterized in that, The temperature regulation assembly also includes a cooling element connected to the sampling tank, which is used to introduce cooling fluid into the sampling tank.
6. The rapid thermal thawing sampling system for permafrost regions according to claim 5, characterized in that, The cooling component includes a cooling section and a cooling pipe. The cooling pipe is equipped with a first control valve, and the connecting pipe is equipped with a second control valve. The cooling pipe is connected to the connecting pipe and is located upstream of the second control valve.
7. The rapid thermal thawing sampling system for permafrost regions according to claim 6, characterized in that, The temperature regulation assembly further includes a temperature regulating element, which includes a first temperature regulating section. The first temperature regulating section is connected to the sampling section and arranged circumferentially along the sampling section. The first temperature regulating section is used to introduce a circulating medium to regulate the temperature of the first temperature regulating section.
8. The rapid thermal thawing sampling system for permafrost regions according to claim 7, characterized in that, The temperature regulating component further includes a second temperature regulating section, which is connected to the sampling section. In the length direction of the drill rod, the second temperature regulating section is located above the sampling section and is connected to the first temperature regulating section. The circulating medium is used to circulate between the first temperature regulating section and the second temperature regulating section.
9. The rapid thermal thawing sampling system for permafrost regions according to claim 8, characterized in that, Along the length of the drill pipe, the length of the sampling section is less than the length of the second temperature regulating section.
10. The rapid thermal thawing sampling system for permafrost regions according to claim 9, characterized in that, The temperature control assembly further includes a first detection element and a second detection element. The first detection element is disposed in the sampling chamber to detect the sample state in the sampling chamber. The second detection element is disposed in the second temperature control section to detect the temperature of the circulating medium in the second temperature control section.