Method and apparatus for in situ measurement of seafloor gas hydrates

Abstract

The application discloses a kind of seabed natural gas hydrate in-situ measurement method and measuring equipment, method includes: S1, rope coring drill is put into well;S2, using rope coring drill coring drilling, and when the core tube is filled with core, stop drilling;S3, using rope fishing assembly to take out inner tube assembly;S4, once hoisting;S5, using rope fisher to put Raman spectrometer into outer tube assembly;S6, second hoisting, and whether ice-like crystalline material exists is detected using probe;S7, if not detected, then take out Raman spectrometer, inner tube assembly is put into, and repeat steps S2-S6;S8, if detected, then locate potential natural gas hydrate reservoir position, and laser Raman scanning is carried out through probe, and whether natural gas hydrate exists is analyzed and judged, and then Raman spectrometer and inner tube assembly are taken out, and repeat steps S2-S6;Thus, drilling coring, camera observation and in-situ Raman spectrum measurement can be realized simultaneously, effectively increase survey efficiency and accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seabed natural gas hydrate exploration, and particularly relates to a seabed natural gas hydrate in-situ measurement method and a measurement device. BACKGROUND

[0002] Natural gas hydrate is a new type of unconventional energy, which has the advantages of no pollution, high energy density, wide distribution and large reserves. Accelerating the development and utilization of natural gas and promoting its coordinated and stable development are of great significance to environmental protection and energy development. The seabed is one of the main occurrence areas of natural gas hydrate. Therefore, how to efficiently and accurately explore it has become a problem to be solved.

[0003] At present, the main methods for marine hydrate exploration include heat and pressure preservation drilling sampling technology. However, the heat and pressure preservation drilling sampling tool has a complex structure, requires multiple coring times, and has a high drilling cost. In addition, hydrates in the sample are prone to decomposition, which affects the measurement accuracy. At the same time, during the logging process, real-time measurement is usually not possible. With the passage of time, hydrates are prone to heat absorption and decomposition, thereby affecting the reliability of logging, resulting in insufficient fine characterization of the reservoir, and further affecting subsequent reservoir exploitation. SUMMARY

[0004] The main purpose of the present application is to provide a seabed natural gas hydrate in-situ measurement method and a measurement device, which aims to solve the above problems.

[0005] To achieve the above purpose, the seabed natural gas hydrate in-situ measurement method provided by the present application comprises the following steps:

[0006] Step S1, a wireline coring tool is put into a well;

[0007] Step S2, the wireline coring tool is used for coring drilling of a target formation, and when a core tube in the wireline coring tool is full of cores, the drilling is stopped;

[0008] Step S3, a wireline fishing assembly of the wireline coring tool is used to take out an inner tube assembly in the wireline coring tool from an outer tube assembly of the wireline coring tool, and a core tube in the inner tube assembly is taken out to save the cores;

[0009] Step S4, once the drilling is pulled out, and the hole is washed with drilling fluid;

[0010] Step S5, a Raman spectrometer is put into the outer tube assembly by using a wireline fishing tool, until a probe of the Raman spectrometer extends from a drill bit of the wireline coring tool;

[0011] Step S6, secondary tripping and detecting whether ice-like crystals exist in the target formation by using the probe;

[0012] Step S7, if the probe does not detect the ice-like crystals, the Raman spectrometer is taken out of the outer pipe assembly by using the wireline fish, the inner pipe assembly is put into the outer pipe assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated;

[0013] Step S8, if the probe detects the ice-like crystals, the potential natural gas hydrate reservoir location is located, laser Raman scanning is performed by the probe to analyze whether natural gas hydrate exists in the target formation, the Raman spectrometer is taken out of the outer pipe assembly by using the wireline fish, the inner pipe assembly is put into the outer pipe assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated.

[0014] Further, the probe comprises a visible light source, a camera, a Raman laser light source and a detector;

[0015] The step S6 specifically comprises:

[0016] The visible light source is turned on, and secondary tripping is performed, and whether ice-like crystals exist in the target formation is observed by using the camera.

[0017] Further, the step S8 specifically comprises:

[0018] Step S81, if the ice-like crystals are observed by the camera, the potential natural gas hydrate reservoir location is located according to the position of the drill bit;

[0019] Step S82, the visible light source is turned off, the Raman laser light source and the detector are turned on, laser Raman scanning is performed on the potential natural gas hydrate reservoir location, and the scanning result is transmitted to a control terminal to analyze whether natural gas hydrate exists in the target formation;

[0020] Step S83, after the laser Raman scanning is completed, the Raman laser light source and the detector are turned off, the Raman spectrometer is taken out of the outer pipe assembly by using the wireline fish, the inner pipe assembly is put into the outer pipe assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated.

[0021] Further, the step S82 specifically comprises:

[0022] Step S821, turn off the visible light source, and turn on the Raman laser light source and the detector, perform laser Raman scanning on the potential natural gas hydrate reservoir position, and transmit the scanning result to the control terminal for analysis to obtain a Raman spectrum curve;

[0023] Step S822, determine whether the natural gas hydrate exists in the target formation according to the Raman spectrum curve.

[0024] Step S823, if the natural gas hydrate exists in the target formation, analyze the occurrence state and density characteristics of the natural gas hydrate according to the Raman spectrum curve.

[0025] Further, the step S822 specifically comprises:

[0026] determine whether the natural gas hydrate exists in the target formation according to the characteristic peak of the Raman spectrum curve.

[0027] Further, the step S823 specifically comprises:

[0028] if the natural gas hydrate exists in the target formation, analyze the structure composition, temperature and pressure conditions and density of the natural gas hydrate according to the height and area of the characteristic peak of the Raman spectrum curve.

[0029] Further, during the first time of drilling, the activity height of the drill bit is L1, the length of the probe is L2, and L1 is greater than or equal to 2L2.

[0030] Further, the drilling fluid comprises plant glue.

[0031] The application also provides a seabed natural gas hydrate in-situ measurement device suitable for a seabed natural gas hydrate in-situ measurement method, and the seabed natural gas hydrate in-situ measurement device comprises:

[0032] The rope coring drilling tool comprises an inner pipe assembly, an outer pipe assembly, a drill bit and a rope fishing assembly, the rope fishing assembly and the inner pipe assembly are movably arranged in the outer pipe assembly, the drill bit is arranged at the bottom end of the outer pipe assembly, and the inner pipe assembly comprises a core pipe.

[0033] The Raman spectrometer is used for being detachably arranged in the outer pipe assembly and comprises a probe, and the probe is used for extending out of the drill bit through the outer pipe assembly to perform Raman spectrum detection.

[0034] The rope fishing device is used for putting or taking out the Raman spectrometer in the outer pipe assembly.

[0035] The control terminal is electrically connected with the Raman spectrometer.

[0036] Furthermore, the probe includes a visible light source, a camera, a Raman laser source, and a detector; and / or,

[0037] The Raman spectrometer also includes a connecting tube that extends vertically, and the probe is connected to the rope retrieval device through the connecting tube.

[0038] In the technical solution of this invention, the wireline coring drill and the Raman spectrometer adapted to it are used for seabed natural gas hydrate detection. This can simultaneously realize drilling and coring of seabed hydrate-bearing strata, photographic observation and in-situ Raman spectroscopy measurement, real-time determination of the Raman spectrum of hydrate reservoirs under in-situ temperature and pressure conditions, determination of the occurrence state and density characteristics of hydrate reservoirs, and effectively increase the efficiency and accuracy of geological exploration of hydrate-bearing strata. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 A flowchart of the in-situ measurement method for seabed natural gas hydrates provided by the present invention;

[0041] Figure 2 for Figure 1 Flowchart of step S8;

[0042] Figure 3 for Figure 2 Flowchart of step S82;

[0043] Figure 4 This is a schematic diagram of the structure of the in-situ measurement device for seabed natural gas hydrates provided by the present invention (when the Raman spectrometer is placed inside the wireline coring tool);

[0044] Figure 5 A schematic diagram of a wireline coring drill bit;

[0045] Figure 6 for Figure 4 A partial structural diagram of the in-situ measurement equipment for natural gas hydrates on the Chinese seabed.

[0046] Explanation of icon numbers:

[0047]

[0048] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0050] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0051] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0052] Natural gas hydrate is a new type of unconventional energy, which has the advantages of no pollution, large energy density, wide distribution and large reserves. Accelerating the development and utilization of natural gas and promoting its coordinated and stable development are of great significance to environmental protection and energy development. The seabed is one of the main occurrence areas of natural gas hydrate. Therefore, how to efficiently and accurately explore it has become a problem to be solved.

[0053] At present, the main methods for marine hydrate exploration include heat and pressure preservation drilling sampling technology. However, the heat and pressure preservation drilling sampling drilling tool structure is complex, the coring frequency is high, the drilling cost is high, and the hydrate in the sample is easy to decompose, which affects the measurement accuracy. At the same time, during the logging process, real-time measurement is usually not possible. With the passage of time, hydrate is easy to decompose endothermically, thereby affecting the reliability of logging, leading to insufficient fine description of the reservoir, and further affecting subsequent reservoir exploitation.

[0054] In view of this, the present invention provides an in-situ measurement method for seabed natural gas hydrates. Figures 1 to 3 A flowchart of the in-situ measurement method for seabed natural gas hydrates provided by the present invention.

[0055] Please see Figure 1 The in-situ measurement method for seabed natural gas hydrates includes the following steps:

[0056] Step S1: Deploy the wireline coring tool into the well.

[0057] It should be noted that in this invention, the wireline coring tool is a conventionally used wireline coring tool, including an inner tube assembly, an outer tube assembly, a drill bit, and a wireline retrieval assembly. The wireline retrieval assembly and the inner tube assembly are movably disposed within the outer tube assembly. The drill bit is disposed at the bottom end of the outer tube assembly. The inner tube assembly includes a core tube.

[0058] Step S2: Use the wireline coring drill to perform core drilling on the target formation, and stop drilling when the core tube inside the wireline coring drill is filled with core.

[0059] Step S3: Using the wireline retrieval assembly of the wireline coring drill, the inner tube assembly of the wireline coring drill is removed from the outer tube assembly of the wireline coring drill, and the core tube inside the inner tube assembly is removed and the core is stored.

[0060] In this step, the inner tube assembly is removed from the outer tube assembly, which not only allows the core to be extracted and preserved, but also provides space for the Raman spectrometer to be used for detection in the subsequent step S5; moreover, the entire wireline coring tool is not removed, saving drilling time and improving detection efficiency.

[0061] Step S4: Pull the drill string once and flush the hole with drilling fluid.

[0062] In this step, a retrieval mechanism is used to lift the drill bit once. During the lifting, the active height of the drill bit is set to L1, the length of the probe is set to L2, and L1≥2L2, so as to leave sufficient space between the drill bit and the bottom of the hole to facilitate the implementation of the subsequent step S5, that is, to provide sufficient space to place the probe of the Raman spectrometer for detection.

[0063] In addition, in this invention, a drilling fluid with a lower temperature and better transparency is used for hole washing. Furthermore, in one embodiment of this invention, the drilling fluid includes plant gum.

[0064] Step S5: Using a wireline retrieval device, lower the Raman spectrometer into the outer tube assembly until the probe of the Raman spectrometer extends out of the drill bit of the wireline coring tool (e.g., Figure 4 (As shown).

[0065] In this step, the inner tube assembly is taken out without taking out the whole rope core drill, to provide space for the Raman spectrometer, and the seabed natural gas hydrate is analyzed in situ and continuously in real time by the Raman spectrometer, to determine the structure and composition of the seabed natural gas hydrate, the temperature and pressure conditions, the density, and the decomposition and secondary synthesis process.

[0066] It should be noted that in the present application, the Raman spectrometer is used with the rope core drill, and the Raman spectrometer is adapted to the outer tube assembly to be put into the outer tube assembly, and the probe can be extended from the drill bit of the rope core drill to facilitate detection of the target formation.

[0067] It should be further noted that in an embodiment of the present application, the size of the rope fisher is the same as that of the rope fishing assembly.

[0068] Step S6, secondary drilling is carried out, and the probe is used to detect whether there is ice-like crystalline material in the target formation.

[0069] In this step, the secondary drilling is carried out slowly so that the probe can carefully detect the target formation.

[0070] Further, the probe includes a visible light source, a camera, a Raman laser light source, and a detector.

[0071] Further, the step S6 specifically includes:

[0072] The visible light source is turned on, and the secondary drilling is carried out, and the camera is used to observe whether there is ice-like crystalline material in the target formation.

[0073] It should be noted that natural gas hydrate is ice-like crystalline material, and its appearance is usually like ice, so the image obtained by the camera can be used to preliminarily determine whether there is natural gas hydrate in the target formation.

[0074] Step S7, if the probe does not detect the ice-like crystalline material, the Raman spectrometer is taken out from the outer tube assembly by the rope fisher, and the inner tube assembly is put into the outer tube assembly by the rope fishing assembly, and the steps S2-S6 are repeated.

[0075] In this step, the ice-like crystalline material is not found by the camera, and it is judged that there is no natural gas hydrate in the target formation at this height space, so the Raman spectrometer is taken out, put into the inner tube assembly, and the steps S2-S6 are repeated to detect the target formation at other height spaces.

[0076] Step S8, if the ice-like crystalline substance is detected by the probe, the potential natural gas hydrate reservoir location is located, and laser Raman scanning is performed by the probe to analyze and determine whether the natural gas hydrate exists in the target formation, the Raman spectrometer is taken out of the outer pipe assembly by the rope socket, the inner pipe assembly is put into the outer pipe assembly by the rope socket assembly, and steps S2-S6 are repeated.

[0077] In this step, after the ice-like crystalline substance is preliminarily determined to exist in the target formation in a certain height space by the camera, secondary determination is performed by laser Raman scanning to accurately analyze whether the natural gas hydrate exists in the target formation in the height space, and after the analysis and determination are completed, the Raman spectrometer is taken out and put into the inner pipe assembly, and the above steps S2-S6 are repeated to perform new detection on the target formation in other height spaces.

[0078] Further, referring to Figure 2 , the step S8 specifically includes:

[0079] Step S81, if the ice-like crystalline substance is observed by the camera, the potential natural gas hydrate reservoir location is located according to the position of the drill bit.

[0080] Step S82, the visible light source is turned off, and the Raman laser light source and the detector are turned on, laser Raman scanning is performed on the potential natural gas hydrate reservoir location, and the scanning result is transmitted to the control terminal to analyze and determine whether the natural gas hydrate exists in the target formation.

[0081] Step S83, after the laser Raman scanning is completed, the Raman laser light source and the detector are turned off, the Raman spectrometer is taken out of the outer pipe assembly by the rope socket, and the inner pipe assembly is put into the outer pipe assembly by the rope socket assembly, and steps S2-S6 are repeated.

[0082] Further, referring to Figure 3 , the step S82 specifically includes:

[0083] Step S821, the visible light source is turned off, and the Raman laser light source and the detector are turned on, laser Raman scanning is performed on the potential natural gas hydrate reservoir location, and the scanning result is transmitted to the control terminal to analyze and determine whether the natural gas hydrate exists in the target formation.

[0084] Step S822, whether the natural gas hydrate exists in the target formation is determined according to the Raman spectrum curve.

[0085] Further, the step S822 specifically includes:

[0086] According to the characteristic peak of the Raman spectrum curve, it is determined whether the natural gas hydrate exists in the target stratum.

[0087] In this step, it is determined whether the natural gas hydrate exists according to whether the characteristic peak of the Raman spectrum curve is around 2906 (the Raman characteristic peak of the methane hydrate is around 2906).

[0088] In step S823, if the natural gas hydrate exists in the target stratum, the occurrence state and the density characteristics of the natural gas hydrate are analyzed according to the Raman spectrum curve.

[0089] Further, the step S823 specifically includes:

[0090] If the natural gas hydrate exists in the target stratum, the structure composition, the temperature and pressure conditions and the density of the natural gas hydrate are analyzed according to the height and the area of the characteristic peak of the Raman spectrum curve.

[0091] It should be noted that the density of the natural gas hydrate is proportional to the area of the characteristic peak of the Raman spectrum curve.

[0092] In the technical scheme of the present application, the submarine natural gas hydrate is detected by using the wireline coring drilling tool and the Raman spectrometer matched therewith, the submarine hydrate-bearing stratum can be drilled, cored and observed by shooting, and the Raman spectrum of the hydrate deposit under the in-situ temperature and pressure conditions can be measured in real time, the occurrence state and the density characteristics of the hydrate deposit are determined, and the efficiency and the accuracy of the geological exploration of the hydrate-bearing stratum are effectively improved.

[0093] The present application also provides a submarine natural gas hydrate in-situ measurement device suitable for the submarine natural gas hydrate in-situ measurement method described above, please refer to Figures 4 to 6 , the submarine natural gas hydrate in-situ measurement device 100 includes a wireline coring drilling tool 1, a Raman spectrometer 2, a wireline fishing device 3 and a control terminal 4, the wireline coring drilling tool 1 includes an inner pipe assembly 11, an outer pipe assembly 12, a drill bit 13 and a wireline fishing assembly 14 (as shown in Figure 5 ), the wireline fishing assembly 14 and the inner pipe assembly 11 are movably arranged in the outer pipe assembly 12, the drill bit 13 is arranged at the bottom end of the outer pipe assembly 12, and the inner pipe assembly 11 includes a core barrel; the Raman spectrometer 2 is arranged detachably in the outer pipe assembly 12 and includes a probe 21, the probe 21 is used for extending out of the drill bit 13 through the outer pipe assembly 12 to perform Raman spectrum detection (as shown in Figure 4 ); the wireline fishing device 3 is used for putting or taking out the Raman spectrometer 2 in the outer pipe assembly 12; and the control terminal 4 is electrically connected with the Raman spectrometer 2.

[0094] Further, the probe 21 comprises a visible light source, a camera, a Raman laser light source and a detector. In this way, the camera observation is realized by the visible light source and the camera, and the in-situ Raman spectrum measurement is realized by the laser light source and the detector.

[0095] Specifically, please refer to Figure 4 and Figure 6 , the Raman spectrometer 2 further comprises a connecting pipe 22, the connecting pipe 22 is arranged in the up-down direction, and the probe 21 is connected with the rope grab 3 through the connecting pipe 22.

[0096] It should be noted that in the present application, the above two technical features can be set alternatively or simultaneously, specifically, in an embodiment of the present application, the above two technical features are set simultaneously, that is, the probe 21 comprises a visible light source, a camera, a Raman laser light source and a detector, and the Raman spectrometer 2 further comprises a connecting pipe 22, the connecting pipe 22 is arranged in the up-down direction, and the probe 21 is connected with the rope grab 3 through the connecting pipe 22.

[0097] Specifically, please refer to Figures 1 to 4 , in an embodiment of the present application, the probe 21 is further provided with a protective shell outside the periphery, which is used for protecting the probe structure.

[0098] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made under the inventive concept of the present application, and the use in other related technical fields directly / indirectly are included in the patent protection scope of the present application.

Claims

1. A method for in situ measurement of natural gas hydrates on the sea floor, characterized in that, The method comprises the following steps: S1, a wireline coring tool is put into a well; S2, the wireline coring tool is used to drill the target formation, and drilling is stopped when a core tube in the wireline coring tool is full of cores; S3, the inner tube assembly in the wireline coring tool is taken out of the outer tube assembly of the wireline coring tool by using a wireline fishing assembly of the wireline coring tool, and the core tube in the inner tube assembly is taken out to save the cores; S4, drilling is pulled out once, and a borehole is washed by using drilling fluid; S5, a Raman spectrometer is put into the outer tube assembly by using a wireline fishing tool until a probe of the Raman spectrometer is extended from a drill bit of the wireline coring tool; S6, drilling is pulled out twice, and whether the ice-like crystals exist in the target formation is detected by using the probe; S7, if the probe does not detect the ice-like crystals, the Raman spectrometer is taken out of the outer tube assembly by using the wireline fishing tool, the inner tube assembly is put into the outer tube assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated; S8, if the probe detects the ice-like crystals, a potential gas hydrate reservoir position is located, laser Raman scanning is performed by using the probe, whether the gas hydrate exists in the target formation is analyzed and judged, the Raman spectrometer is taken out of the outer tube assembly by using the wireline fishing tool, the inner tube assembly is put into the outer tube assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated.

2. The method of claim 1, wherein, The probe comprises a visible light source, a camera, a Raman laser light source and a detector; The step S6 specifically comprises: the visible light source is turned on, drilling is pulled out twice, and whether the ice-like crystals exist in the target formation is observed by using the camera.

3. The method of claim 2, wherein, The step S8 specifically comprises: S81, if the ice-like crystals are observed by using the camera, the potential gas hydrate reservoir position is located according to the position of the drill bit; S82, the visible light source is turned off, the Raman laser light source and the detector are turned on, laser Raman scanning is performed corresponding to the potential gas hydrate reservoir position, and scanning results are transmitted to a control terminal to analyze and judge whether the gas hydrate exists in the target formation; S83, after the laser Raman scanning is completed, the Raman laser light source and the detector are turned off, the Raman spectrometer is taken out of the outer tube assembly by using the wireline fishing tool, the inner tube assembly is put into the outer tube assembly by using the wireline fishing assembly, and the steps S2-S6 are repeated.

4. The in-situ measurement method for seabed natural gas hydrates as described in claim 3, characterized in that, The step S82 specifically comprises: S821, the visible light source is turned off, the Raman laser light source and the detector are turned on, laser Raman scanning is performed corresponding to the potential gas hydrate reservoir position, and scanning results are transmitted to a control terminal to analyze and judge whether the gas hydrate exists in the target formation; S822, whether the gas hydrate exists in the target formation is judged according to the Raman spectrum curve. Step S823: If the target stratum contains natural gas hydrate, analyze the occurrence state and density characteristics of the natural gas hydrate according to the Raman spectrum curve.

5. The method of claim 4, wherein, The step S822 specifically comprises: According to the characteristic peaks of the Raman spectrum curve, determine whether the target stratum contains natural gas hydrate.

6. The method of claim 4, wherein, The step S823 specifically comprises: If the target stratum contains natural gas hydrate, analyze the structure composition, temperature and pressure conditions and density of the natural gas hydrate according to the height and area of the characteristic peaks of the Raman spectrum curve.

7. The method of claim 1, wherein, During the first time of drilling, the activity height of the drill bit is set as L1, the length of the probe is set as L2, and L1≥2L2.

8. The method of claim 1, wherein, The drilling fluid comprises plant glue.

9. A subsea natural gas hydrate in-situ measuring apparatus adapted for use in a subsea natural gas hydrate in-situ measuring method as claimed in any one of claims 1 to 8, characterised in that, The seabed natural gas hydrate in-situ measurement device comprises: The wireline coring drilling tool comprises an inner pipe assembly, an outer pipe assembly, a drill bit, and a wireline fishing assembly, the wireline fishing assembly and the inner pipe assembly are movably arranged in the outer pipe assembly, the drill bit is arranged at the bottom end of the outer pipe assembly, and the inner pipe assembly comprises a core barrel. The Raman spectrometer is used to be detachably arranged in the outer pipe assembly and comprises a probe, the probe is used to perform Raman spectrum detection through the outer pipe assembly and the drill bit. The wireline fishing device is used to put in or take out the Raman spectrometer in the outer pipe assembly, and the control terminal is electrically connected with the Raman spectrometer.

10. The subsea natural gas hydrate in situ measurement apparatus of claim 9, wherein, The probe comprises a visible light source, a camera, a Raman laser light source and a detector; and / or The Raman spectrometer further comprises a connecting pipe, the connecting pipe is arranged in an up-down direction, and the probe is connected with the wireline fishing device through the connecting pipe.

Images