A seabed drill-based static sounding device and a sounding method

Abstract

The present disclosure belongs to the technical field of marine geological exploration, and provides a static sounding device based on a seabed drilling machine and a sounding method. The device is detachably connected in a drill pipe of the seabed drilling machine, and specifically comprises, from top to bottom, a hanging unit, a driving unit, a penetration unit and a static sounding probe. The driving unit comprises, from inside to outside, a lead screw driving shaft, an inner-rotating frameless motor and a shell. When sounding, the inner-rotating frameless motor rotor is rotated to drive the penetration sleeve and the static sounding probe to penetrate into the stratum to obtain relevant data. The present disclosure adopts the inner-rotating frameless motor, greatly reduces the part setting and reduces the complexity, and greatly reduces the size of the overall structure in the vertical direction, so that the penetration stroke of the static sounding probe can be improved within the effective stroke of the drill pipe.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of marine geological exploration, and particularly relates to a static sounding device based on a seafloor drilling machine and a sounding method. BACKGROUND

[0002] As a new type of seafloor resource, seafloor natural gas hydrate has a very large reserve. The global seafloor natural gas hydrate reserve is twice the existing natural gas and oil reserves, and has a broad development prospect. Exploring and developing seafloor natural gas hydrate resources as a substitute for natural gas and oil energy has great significance.

[0003] At present, the seafloor drilling machine technology has significantly improved the drilling efficiency and reduced the cost by realizing large-depth butt joint and pressure core sampling of a drill pipe, and has become a key technical support for reducing cost and increasing efficiency in natural gas hydrate exploration and development. The geotechnical multi-parameter static sounding technology is widely used in the bottom geotechnical mechanics detection of hydrate occurrence area due to its high precision and strong stability. The technology can accurately identify the sediment type, hydrate occurrence state and spatial distribution characteristics, and provide key support for resource potential evaluation. However, the process methods used by the drilling sampling and the static sounding technology are different, the static sounding technology needs a separate penetration system, and cannot be matched with the drilling sampling, which limits the detection efficiency and data accuracy of the hydrate exploration and restricts the improvement of the multi-parameter comprehensive analysis capability. SUMMARY

[0004] The present disclosure provides a static sounding device based on a seafloor drilling machine and a sounding method to at least solve the above technical problems in the prior art.

[0005] According to a first aspect of the present disclosure, a static sounding device based on a seafloor drilling machine is provided, which is detachably connected in a drill pipe of the seafloor drilling machine; the drill pipe comprises a snap-off pipe, a snap-off chamber, an outer pipe and a drill bit connected in sequence from top to bottom, and a seat ring is embedded in an end of the outer pipe close to the snap-off chamber, and the inner diameter of the seat ring is smaller than the inner diameter of the drill pipe; the static sounding device comprises a hanging unit, a driving unit, a penetration unit and a static sounding probe connected in sequence from top to bottom; wherein,

[0006] The hanging unit comprises a central shaft, a snap-off mechanism, an armored cable and a suspension connecting pipe connected to the upper and lower ends of the central shaft respectively; a suspension ring is arranged at the lower end of the suspension connecting pipe, the outer diameter of the suspension ring is greater than the inner diameter of the seat ring, and the suspension ring is crimped on the top surface of the seat ring; the snap-off mechanism is arranged around the central shaft, and the snap-off mechanism can be outwardly expanded under the action of an external force to be connected with the snap-off chamber or inwardly contracted to be disconnected with the snap-off chamber, so as to realize the detachable connection between the static sounding device and the drill pipe;

[0007] The driving unit comprises a screw driving shaft, an inner-rotating frameless motor and a shell arranged in sequence from inside to outside; the screw driving shaft is arranged at the center of the driving unit; the inner-rotating frameless motor comprises a stator and a rotor, the stator is connected with the shell; the rotor is connected with the screw driving shaft for driving the screw driving shaft to rotate;

[0008] The penetrating unit comprises a hollow screw, a hollow screw nut, a penetrating sleeve and an elastic spiral water-tight cable; the elastic spiral water-tight cable is arranged at the center of the penetrating unit; the hollow screw is arranged outside the elastic spiral water-tight cable and connected with the screw driving shaft at the upper end for rotating with the screw driving shaft; the hollow screw is provided with the hollow screw nut and the penetrating sleeve outside, the lower end of the hollow screw nut is connected with the upper end of the penetrating sleeve for moving up and down with the rotation of the hollow screw to drive the penetrating sleeve to move downward; the upper end of the static force sounding probe is respectively connected with the lower end of the penetrating sleeve and the lower end of the elastic spiral water-tight cable for obtaining relevant data in the stratum under the driving of the penetrating sleeve and driving the elastic spiral water-tight cable to extend in the vertical direction to transmit data in real time.

[0009] In an implementable manner, the stator and the shell are fixedly connected through a key groove.

[0010] In an implementable manner, the rotor and the screw driving shaft are fixedly connected through a key groove.

[0011] In an implementable manner, the driving unit further comprises a motor retaining ring, which is arranged at the upper end of the inner-rotating frameless motor for limiting the position of the inner-rotating frameless motor in the vertical direction.

[0012] In an implementable manner, a thrust ball bearing is arranged at each of the upper and lower ends of the screw driving shaft for bearing the axial force generated in the rotation process of the screw driving shaft.

[0013] In an implementable manner, the upper end and the lower end of the shell are respectively provided with an upper end cover and a lower end cover for fixing and sealing the components of the driving unit.

[0014] In an implementable manner, a first dynamic sealing ring and a second dynamic sealing ring are respectively arranged between the screw driving shaft and the upper end cover and the lower end cover.

[0015] Specifically, the dynamic sealing ring is arranged for sealing in the rotation process. The first dynamic sealing ring and the second dynamic sealing ring are respectively arranged as a first Gley ring and a second Gley ring.

[0016] In an embodiment, a sealing ring is arranged between the housing and the upper end cover for sealing between the housing and the upper end cover.

[0017] Specifically, the sealing ring is an O-ring.

[0018] In an embodiment, the driving unit further comprises a water-tight connector, which is arranged through the upper end cover and the motor blocking ring, for supplying power to the inner rotating frameless motor and sealing the driving unit.

[0019] In an embodiment, the hollow screw rod is fixedly connected with the screw rod driving shaft by bolts.

[0020] In an embodiment, the lower end of the hollow screw rod nut is connected with the upper end of the penetrating sleeve in a threaded form.

[0021] In an embodiment, the upper end of the static sounding probe is connected with the lower end of the penetrating sleeve in a threaded form.

[0022] In an embodiment, the penetrating unit further comprises an outer support cylinder, which is arranged at the outermost side of the penetrating unit; the upper end of the outer support cylinder is fixedly connected with the lower end of the housing by bolts.

[0023] In an embodiment, the penetrating unit further comprises a limiting block, which is arranged in a groove on both sides of the outer support cylinder; the lower end of the limiting block is connected with the upper end of the hollow screw rod nut for limiting the axial displacement of the hollow screw rod nut.

[0024] Specifically, the lower end of the limiting block is fixedly connected with the upper end of the hollow screw rod nut by bolts.

[0025] In an embodiment, the penetrating unit further comprises a limiting sleeve, which is arranged between the penetrating sleeve and the outer support cylinder for limiting the axial displacement of the penetrating sleeve.

[0026] In an embodiment, the elastic clamping mechanism comprises an elastic clamping tube and an elastic clamping.

[0027] Specifically, the structure of the elastic clamping mechanism is similar to that of the elastic clamping in the conventional wire-line coring structure, which will not be described here.

[0028] In an embodiment, the lowering unit further comprises a fishing head, the upper end of which is connected with the armored cable, and the lower end of which is connected with the upper end of the elastic clamping tube.

[0029] In an embodiment, the lower end of the elastic clamping tube is connected with the upper end of the suspension connecting tube.

[0030] According to a second aspect of the present disclosure, a static sounding device is provided, comprising the following steps:

[0031] S1: lowering the static sounding device into the drill pipe of the subsea drilling rig through the armored cable until the suspension ring of the suspension connecting pipe is crimped on the seat ring of the drill pipe, and the elastic clamping mechanism is clamped with the elastic clamping chamber;

[0032] S2: driving the inner-rotating frameless motor to work through the power line of the armored cable, wherein the stator remains fixed, the rotor rotates and drives the lead screw drive shaft to rotate, further driving the hollow lead screw to rotate; the rotating hollow lead screw drives the hollow lead screw nut to move up and down, thereby driving the penetration sleeve and the static sounding probe to penetrate into the stratum below the lower part of the drill pipe, and the static sounding probe obtains relevant data; at the same time, the elastic spiral water-tight cable extends in the vertical direction with the penetration of the static sounding probe to transmit the relevant data in real time;

[0033] S3: after the operation is completed, the rotor reverses rotation to recover the penetration sleeve and the static sounding probe; after the recovery is completed, the static sounding device is lifted upward by the armored cable, and during the lifting process, the elastic clamping mechanism is inwardly contracted and separated from the elastic clamping chamber, so as to lift the static sounding device to the platform of the subsea drilling rig.

[0034] According to an embodiment of the present disclosure, at least the following beneficial effects are achieved:

[0035] The inner-rotating frameless motor (inner-rotor frameless torque motor) is a frameless design motor with the rotor built-in and the stator built-out, the rotor is directly integrated on the load shaft, the traditional moving parts (such as shaft coupling and speed reducer) are saved, the volume is reduced, it is suitable for space-limited applications, the rotor mass is concentrated at the rotation center, the inertia is small, the acceleration / deceleration is faster, the system response speed can be significantly improved, and more accurate motion control can be realized. The driving unit of the present disclosure adopts the inner-rotating frameless motor, and because the structure is a hollow structure, compared with the previous “bevel gear set transmission”, the transmission cable (elastic spiral water-tight cable) of the static sounding probe can be directly connected with the armored cable along the hollow channel, which can greatly reduce the part setting at this structure and reduce the complexity; and because the structure is greatly reduced in the vertical direction, the penetration stroke of the static sounding probe can be improved within the effective stroke of the drill pipe.

[0036] In addition, compared with traditional scientific research vessels, the seabed drilling machine has the advantages of flexible control, small platform demand, high automation, etc. The downhole geotechnical exploration technology can directly test various parameters of the reservoir in situ, has high testing accuracy and reliability, and can accurately obtain the in-situ mechanical properties and hydrate distribution characteristics of the reservoir through multi-sensor integration and optimized release and recovery mode. The present disclosure integrates in-situ exploration technology and sampling technology on the seabed drilling machine platform, which will further enrich the exploration means of China's marine hydrate, realize cost reduction and efficiency increase, and provide technical support for the development of China's marine natural gas hydrate.

[0037] It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of the present disclosure, nor to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which:

[0039] In the drawings, identical or corresponding reference numerals indicate identical or corresponding parts.

[0040] Figure 1 A structure diagram of a static sounding device in an embodiment of the present disclosure is shown;

[0041] Figure 2 A longitudinal section view of a driving unit in an embodiment of the present disclosure is shown;

[0042] Figure 3 A longitudinal section view of a driving unit in an embodiment of the present disclosure is shown;

[0043] Figure 4 An enlarged view of the longitudinal section structure of part A of the present disclosure is shown. Figure 1

[0044] Explanation of reference numerals in the drawings:

[0045] ​11 - armored cable; 12 - fishing head; 131 - spring-loaded tube; 132 - spring; 14 - suspension connection pipe; 141 - suspension ring; 2 - drive unit; 210 - lead screw drive shaft; 211 - stator; 212 - rotor; 213 - housing; 214 - motor retainer; 215 - first thrust ball bearing; 216 - second thrust ball bearing; 217 - upper end cover; 218 - lower end cover; 220 - first dynamic seal ring; 221 - second dynamic seal ring; 222 - seal ring; 223 - water-tight connector; 3 - penetration unit; 310 - hollow lead screw; 311 - hollow lead screw nut; 312 - penetration sleeve; 313 - elastic spiral water-tight cable; 314 - outer support cylinder; 315 - limiting block; 316 - limiting sleeve; 4 - static cone penetration probe. DETAILED DESCRIPTION

[0046] In order to make the purpose, features and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0047] For the structure and working mode of the coring drill pipe of the seabed drill, the present disclosure designs an in-situ geotechnical multi-parameter detection device, which is designed to meet the working requirements of the static cone penetration probe penetrating into the seabed sediment at a constant speed (2 cm / s). The design adopts a stable downhole electric drive lead screw structure as the core penetration mechanism, which ensures the precise control and low disturbance characteristics of the penetration process, and realizes the real-time uploading of the static cone penetration probe data and the accurate matching of the formation depth. The device will be described in detail below.

[0048] EMBODIMENT

[0049] The present embodiment provides a static cone penetration device based on a seabed drill, which is detachably connected in a drill pipe of the seabed drill; the drill pipe comprises a spring-loaded pipe, a spring-loaded chamber, an outer pipe and a drill bit connected in sequence from top to bottom, and a seat ring is embedded in one end of the outer pipe close to the spring-loaded chamber, and the inner diameter of the seat ring is smaller than the inner diameter of the drill pipe; referring to Figure 1 , the static cone penetration device comprises a hanging unit, a drive unit 2, a penetration unit 3 and a static cone penetration probe 4 connected in sequence from top to bottom; wherein,

[0050] The hanging unit comprises a central shaft, a snap mechanism, an armored cable 11 and a suspension connecting pipe 14 connected to the upper and lower ends of the central shaft respectively, and a fishing head 12. Specifically, the lower end of the suspension connecting pipe 14 is provided with a suspension ring 141, the outer diameter of the suspension ring 141 is greater than the inner diameter of the seat ring, and the suspension ring 141 is crimped on the top surface of the seat ring; the snap mechanism is arranged around the central shaft, and the snap mechanism can be expanded outwardly to be connected with the snap chamber or be contracted inwardly to be disconnected from the snap chamber under the action of an external force, so as to realize the detachable connection between the static force sounding device and the drill pipe; the snap mechanism mainly comprises a snap pipe 131 and a snap 132, and the connection or disconnection is realized by the snap 132, which is expanded outwardly to be connected with the snap chamber and contracted inwardly to be disconnected from the snap chamber; the specific structure of the snap mechanism is similar to that of the snap mechanism in the conventional wire-line coring structure, and will not be described here. The upper end of the fishing head 12 is connected with the armored cable 11, and the lower end is connected with the upper end of the snap pipe 131; the lower end of the snap pipe 131 is connected with the upper end of the suspension connecting pipe 14.

[0051] The specific structure of the driving unit 2 is shown in Figure 2 The driving unit 2 comprises a lead screw driving shaft 210, an inner-rotating frameless motor and a shell 213 arranged in sequence from inside to outside; the lead screw driving shaft 210 is arranged at the center of the driving unit 2, and the upper and lower ends of the lead screw driving shaft 210 are respectively provided with a first thrust ball bearing 215 and a second thrust ball bearing 216 for bearing the axial force generated by the lead screw driving shaft 210 in the rotating process; the inner-rotating frameless motor comprises a stator 211 and a rotor 212, the stator 211 is fixedly connected with the shell 213 through a key groove, for generating a rotating magnetic field to drive the rotor 212 to rotate; the rotor 212 is fixedly connected with the lead screw driving shaft 210 through a key groove, for driving the lead screw driving shaft 210 to rotate. The upper end of the inner-rotating frameless motor is provided with a motor retaining ring 214 for limiting the position of the inner-rotating frameless motor in the vertical direction. The upper end of the shell 213 is provided with an upper end cover 217, and the lower end is provided with a lower end cover 218 for fixing and sealing the components of the driving unit 2. The first dynamic sealing ring 220 and the second dynamic sealing ring 221 are respectively arranged between the lead screw driving shaft 210 and the upper end cover 217 and the lower end cover 218 for sealing in the rotating process, wherein the first dynamic sealing ring 220 is arranged as a first Gley ring, and the second dynamic sealing ring 221 is arranged as a second Gley ring. A sealing ring 222 is arranged between the shell 213 and the upper end cover 217 for sealing between the shell 213 and the upper end cover 217, and the sealing ring 222 is arranged as an O-ring. The driving unit 2 further comprises a watertight connector 223, which is arranged through the upper end cover 217 and the motor retaining ring 214, for supplying power to the inner-rotating frameless motor and sealing the driving unit 2.

[0052] The structure of the driving unit 2 is shown in Figure 3As shown, the penetrating unit 3 comprises a hollow screw rod 310, a hollow screw rod nut 311, a penetrating sleeve 312, and an elastic spiral water-tight cable 313. The elastic spiral water-tight cable 313 is arranged in the center of the penetrating unit 3; the hollow screw rod 310 is arranged outside the elastic spiral water-tight cable 313 and is connected with the screw rod driving shaft 210 at the upper end (see Figure 4 ) for rotation with the screw rod driving shaft 210; the hollow screw rod 310 is externally provided with the hollow screw rod nut 311 and the penetrating sleeve 312, the lower end of the hollow screw rod nut 311 is threadedly connected with the upper end of the penetrating sleeve 312 for up-and-down movement with the rotation of the hollow screw rod 310 to drive the penetrating sleeve 312 to move downward; the upper end of the static cone penetration probe 4 is threadedly connected with the lower end of the penetrating sleeve 312, and the upper end of the static cone penetration probe 4 is also connected with the lower end of the elastic spiral water-tight cable 313 for penetrating into the stratum under the driving of the penetrating sleeve 312 to obtain relevant data and driving the elastic spiral water-tight cable 313 to extend in the vertical direction to transmit data in real time. The penetrating unit 3 further comprises an outer support cylinder 314, a limiting block 315 and a limiting sleeve 316; the outer support cylinder 314 is arranged at the outermost side of the penetrating unit 3; the upper end of the outer support cylinder 314 is fixedly connected with the lower end of the shell 213 by means of bolts (see Figure 4 ). The limiting block 315 is arranged in the grooves on both sides of the outer support cylinder 314; the lower end of the limiting block 315 is fixedly connected with the upper end of the hollow screw rod nut 311 for limiting the axial displacement of the hollow screw rod nut 311. The limiting sleeve 316 is arranged between the penetrating sleeve 312 and the outer support cylinder 314 for limiting the axial displacement of the penetrating sleeve 312.

[0053] The penetration method of the static cone penetration device is as follows:

[0054] (1) After the opening of the seabed drilling machine, the static cone penetration device is lowered into the drill pipe of the seabed drilling machine by the armored cable 11 through the underwater winch device until the suspension ring 141 of the suspension connecting pipe 14 is crimped on the seat ring of the drill pipe, and the elastic clamping mechanism is clamped with the elastic clamping chamber (specifically, the elastic clamping 132 is clamped with the elastic clamping chamber).

[0055] (2) The inner rotating frameless motor is driven to work through the power line of the armored cable 11, wherein the stator 211 remains fixed to generate a rotating magnetic field to drive the rotor 212 to rotate, the rotating rotor 212 drives the screw rod driving shaft 210 to rotate, and further drives the hollow screw rod 310 to rotate; the rotating hollow screw rod 310 drives the hollow screw rod nut 311 to move up and down, thereby driving the penetrating sleeve 312 and the static cone penetration probe 4 to penetrate into the stratum below the drill pipe at a constant speed, and the static cone penetration probe 4 obtains relevant geotechnical mechanical parameter data; during the penetration process, the elastic spiral water-tight cable 313 extends in the vertical direction with the penetration of the static cone penetration probe 4 to transmit the above data in real time.

[0056] (3) After the operation is completed, the rotor 212 reverses rotation to recover the penetration sleeve 312 and the static sounding probe 4; after recovery is completed, the static sounding device is lifted upward using the armored cable 11, and during the lifting process, the elastic clamping mechanism is inwardly contracted (specifically, the elastic clamping 132 is inwardly contracted) and separated from the elastic clamping chamber, so as to lift the static sounding device to the seafloor drilling platform.

[0057] In summary, the inner-rotating frameless motor (suitable for space-limited applications, the rotor mass is concentrated at the rotation center, the inertia is small, the acceleration / deceleration is faster, the system response speed is improved, and more accurate motion control can be achieved) adopted by the present disclosure is a hollow structure. Compared with the previous design of "bevel gear set transmission", the transmission cable of the static sounding probe can be directly connected with the armored cable along the hollow channel, greatly reducing the part setting at this structure, reducing the complexity, and the size of the structure in the vertical direction is greatly reduced. The effective stroke of the drilling pipe can improve the penetration stroke of the static sounding probe.

[0058] Compared with the traditional scientific research ship exploration platform, the seafloor drilling machine has the advantages of flexible control, small platform demand, high automation, etc. The downhole geotechnical survey technology can directly test various parameters of the reservoir in situ, has high test accuracy and reliability, and through the integration and deployment and recovery mode optimization, the in-situ mechanical properties and hydrate distribution characteristics of the reservoir can be accurately obtained. The present disclosure integrates the in-situ survey technology and sampling technology on the seafloor drilling machine platform, which will further enrich the exploration means of China's marine hydrate, realize cost reduction and efficiency increase, and provide technical support for the development of China's marine natural gas hydrate.

[0059] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present disclosure can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved, which is not limited herein.

[0060] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0061] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A seabed drill rig based static cone penetration apparatus, characterised in that, The static sounding device is detachably connected to a drill pipe of the seabed drilling machine; the drill pipe comprises a snap-on blocking pipe, a snap-on chamber, an outer pipe and a drill bit connected in sequence from top to bottom, and an annular seat ring is embedded in an end of the outer pipe close to the snap-on chamber, an inner diameter of the seat ring is smaller than an inner diameter of the drill pipe; the static sounding device comprises a hanging unit, a driving unit, a penetration unit and a static sounding probe connected in sequence from top to bottom; wherein, The hanging unit comprises a central shaft, a snap-on mechanism, an armored cable and a suspension connecting pipe connected to upper and lower ends of the central shaft respectively; a suspension ring is arranged at a lower end of the suspension connecting pipe, an outer diameter of the suspension ring is larger than the inner diameter of the seat ring, and the suspension ring is press-fitted on a top surface of the seat ring; the snap-on mechanism is arranged around the central shaft, the snap-on mechanism can be outwardly expanded under the action of an external force to be connected with the snap-on chamber or inwardly contracted to be disconnected with the snap-on chamber, so as to realize detachable connection between the static sounding device and the drill pipe; The driving unit comprises a lead screw driving shaft, an inner-rotating frameless motor and a shell arranged in sequence from inside to outside; the lead screw driving shaft is arranged at the center of the driving unit; the inner-rotating frameless motor comprises a stator and a rotor, the stator is connected with the shell; the rotor is connected with the lead screw driving shaft for driving the lead screw driving shaft to rotate; The penetration unit comprises a hollow lead screw, a hollow lead screw nut, a penetration sleeve and an elastic spiral water-tight cable; the elastic spiral water-tight cable is arranged at the center of the penetration unit; the hollow lead screw is arranged outside the elastic spiral water-tight cable and is connected with the lead screw driving shaft at an upper end for rotating with the lead screw driving shaft; the hollow lead screw is provided with the hollow lead screw nut and the penetration sleeve outside, a lower end of the hollow lead screw nut is connected with an upper end of the penetration sleeve for moving up and down with the rotation of the hollow lead screw to drive the penetration sleeve to move downward; an upper end of the static sounding probe is connected with a lower end of the penetration sleeve and a lower end of the elastic spiral water-tight cable respectively for obtaining relevant data in the stratum under the drive of the penetration sleeve and extending in the vertical direction to transmit data in real time.

2. A static cone penetrometer device according to claim 1, wherein, In the driving unit, the stator is fixedly connected with the shell through a key groove; the rotor is fixedly connected with the lead screw driving shaft through a key groove.

3. The static cone device of claim 1, wherein, The driving unit further comprises a motor retaining ring arranged at an upper end of the inner-rotating frameless motor for limiting the position of the inner-rotating frameless motor in the vertical direction.

4. The static cone device of claim 1, wherein, A thrust ball bearing is arranged at each of upper and lower ends of the lead screw driving shaft for bearing axial force generated in the rotation process of the lead screw driving shaft.

5. The static cone device of claim 1, wherein, An upper end cover and a lower end cover are arranged at upper and lower ends of the shell respectively for fixing and sealing each component of the driving unit.

6. The static cone device of claim 1, wherein, The hollow lead screw is fixedly connected with the lead screw driving shaft through a bolt; A lower end of the hollow lead screw nut is connected with an upper end of the penetration sleeve in the form of thread; An upper end of the static sounding probe is connected with a lower end of the penetration sleeve in the form of thread.

7. The static cone device of claim 1, wherein, The penetrating unit further comprises an outer supporting cylinder, a limiting block and a limiting sleeve; the outer supporting cylinder is arranged at the outermost side of the penetrating unit; the upper end of the outer supporting cylinder is fixedly connected with the lower end of the shell by bolts; The limiting block is arranged in the groove on both sides of the outer supporting cylinder; the lower end of the limiting block is connected with the upper end of the hollow screw nut, for limiting the axial displacement of the hollow screw nut; The limiting sleeve is arranged between the penetrating sleeve and the outer supporting cylinder, for limiting the axial displacement of the penetrating sleeve.

8. The static cone device of claim 1, wherein, In the hanging unit, the elastic clamping mechanism comprises an elastic clamping pipe and an elastic clamping; The hanging unit further comprises a fishing head, the upper end of the fishing head is connected with the armored cable, and the lower end is connected with the upper end of the elastic clamping pipe.

9. A static cone penetrometer device according to claim 8, wherein, The lower end of the elastic clamping pipe is connected with the upper end of the suspension connecting pipe.

10. A method of sounding with the static penetrometer device according to any one of claims 1 to 9, characterized in that, The method comprises the following steps: S1: lowering the static sounding device into the drill pipe of the subsea drilling rig through the armored cable until the suspension ring of the suspension connecting pipe is crimped on the seat ring of the drill pipe, and the elastic clamping mechanism is clamped with the elastic clamping chamber; S2: driving the inner rotating frameless motor to work through the power line of the armored cable, wherein the stator remains fixed, the rotor rotates and drives the screw drive shaft to rotate, further driving the hollow screw to rotate; the rotating hollow screw drives the hollow screw nut to move up and down, thereby driving the penetrating sleeve and the static sounding probe to penetrate into the stratum below the drill pipe, the static sounding probe acquires relevant data; at the same time, the elastic spiral water-tight cable extends in the vertical direction with the penetration of the static sounding probe, to transmit the relevant data in real time; S3: after the operation is completed, the rotor reverses to recover the penetrating sleeve and the static sounding probe; after the recovery is completed, the armored cable is used to lift the static sounding device upward, and in the lifting process, the elastic clamping mechanism is inwardly contracted and separated from the elastic clamping chamber, so as to lift the static sounding device to the subsea drilling rig platform.

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