Static pressure sampling device suitable for downhole operation

Abstract

The utility model provides a static pressure sampling device suitable for underground operation, and belongs to the technical field of underground sampling equipment. Comprising a drill bit, a driving cylinder barrel and a sampling piston pipe, a coaxial sampling hole is formed in the drill bit, the driving cylinder barrel is arranged in the sampling hole, one end of the driving cylinder barrel is connected with the outside through a bottom opening of the sampling hole, and the other end of the driving cylinder barrel is used for being connected with an oil filling device; the piston section is slidably mounted in the driving cylinder barrel, the outer diameter of the sampling pipe body is smaller than the inner diameter of the driving cylinder barrel, a water outlet communicated with the outer side wall is formed in the top of the sampling pipe body, and anti-backflow blades capable of being opened and closed inwards are arranged at an opening in the bottom of the sampling pipe body. Samples are obtained through a static pressure method, then high-quality sediment samples are obtained, and surveying accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of underground sampling equipment, especially to a static pressure sampling device suitable for downhole operation. BACKGROUND

[0002] The drilling sampling device refers to a device or equipment for collecting samples of rocks or soil layers in the form of drilling. In the process of infrastructure construction, the geographical form and soil structure of the construction site need to be fully surveyed to develop a reasonable construction plan, and soil sampling is an essential part of the survey.

[0003] In the related art, when drilling operations are carried out at sea, the seabed stratum samples are usually obtained by rotating the drilling tool.

[0004] When the sample is soft and the quality requirement of the sample is high, the drilling method may affect the quality of the sample, and the original sample cannot be obtained, which may cause deviation in the survey accuracy. INVENTION CONTENTS

[0005] The utility model embodiment provides a static pressure sampling device suitable for downhole operation, which realizes sample acquisition by static pressure method, and further acquires high-quality sediment sample m, and improves survey accuracy. The technical scheme is as follows:

[0006] The utility model embodiment provides a static pressure sampling device suitable for downhole operation, which comprises a drill bit, a driving cylinder and a sampling piston pipe,

[0007] The drill bit is internally provided with a coaxially arranged sampling hole, the driving cylinder is arranged in the sampling hole, one end of the driving cylinder is connected to the outside through the bottom opening of the sampling hole, the other end is used for connecting with an oil filling device, the sampling piston pipe comprises a piston section and a sampling pipe body close to the bottom opening of the sampling hole, the piston section is slidably installed in the driving cylinder, the outer diameter of the sampling pipe body is smaller than the inner diameter of the driving cylinder, the top of the sampling pipe body is provided with a drainage port in communication with the outer sidewall, and the bottom opening of the sampling pipe body is provided with anti-backflow blades which can be opened and closed internally.

[0008] Optionally, the inner diameter of the driving cylinder is greater than the inner diameter of the sampling pipe body.

[0009] Optionally, the bottom of the sampling pipe body is provided with a vertebral body section, and the outer diameter of the vertebral body section gradually decreases in the direction close to the bottom opening of the sampling hole.

[0010] Optionally, a one-way valve is arranged in the drainage port and only conducts to the outer sidewall of the pipe body.

[0011] Optionally, the sampling tube is provided with a sampling inner tube, the anti-backflow blades are arranged at the bottom of the sampling inner tube, and the sampling inner tube is detachably connected with the sampling tube.

[0012] Optionally, a plurality of annular grooves are arranged on the outer side wall of the piston section in the axial direction, and sealing rings are arranged in the annular grooves.

[0013] Optionally, a plurality of anti-backflow blades are arranged in a spiral manner and are arranged in an overlapping manner.

[0014] Optionally, the driving cylinder is detachably connected with the drill bit.

[0015] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0016] The static pressure sampling device suitable for downhole operation provided by the embodiment of the utility model is composed of a relatively movable nested sampling mechanism formed by the driving cylinder and the sampling piston tube arranged in the drill bit. After the drill bit drills into a specified stratum position, the sampling piston tube is pushed downward by filling oil into the driving cylinder, so that the sediment sample pushes away the anti-backflow blades and enters the sampling tube body for storage, and the internal water is discharged through the top water outlet to ensure that the sediment sample can enter smoothly. Then, the oil supply is stopped, the sampling piston tube is lifted by water pressure to complete upward recovery, and the sampling tube body is automatically closed by the gravity of the sediment sample. The whole process does not need the drill bit to further drill and extend, the sample is obtained by the static pressure method, and then the high-quality sediment sample is obtained, and the surveying accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is the structure schematic view of the static pressure sampling device suitable for downhole operation provided by the embodiment of the utility model;

[0019] Figure 2 is the bottom structure schematic view of the anti-backflow blades in the closed state of the sampling tube body provided by the embodiment of the utility model;

[0020] Figure 3 is the state schematic view of the static pressure sampling device when the drill bit drills into the sampling position provided by the embodiment of the utility model;

[0021] Figure 4 is a state diagram of the sampling piston pipe penetrating sampling process in the static pressure sampling device provided by the embodiment of the present application;

[0022] Figure 5 is a state diagram of the static pressure sampling device completing sampling and recycling provided by the embodiment of the present application.

[0023] In the figure: 1-drill bit; 2-driving cylinder; 3-sampling piston rod; 11-sampling hole; 31-piston section; 32-sampling pipe body; 311-annular groove; 312-sealing ring; 321-drainage opening; 322-anti-backflow blade; 323-conical section; 324-one-way valve; 325-sampling inner pipe; m-sediment sample. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will make further detailed description to the embodiment of the present application in combination with the drawings.

[0025] Figure 1 is a structure diagram of the static pressure sampling device suitable for downhole operation provided by the embodiment of the present application; Figure 2 is a bottom structure diagram of the anti-backflow blade in the sampling pipe body in the closed state provided by the embodiment of the present application; Figure 3 is a state diagram of the static pressure sampling device penetrating into the sampling position following the drill bit provided by the embodiment of the present application; Figure 4 is a state diagram of the sampling piston pipe penetrating sampling process in the static pressure sampling device provided by the embodiment of the present application; Figure 5 is a state diagram of the static pressure sampling device completing sampling and recycling provided by the embodiment of the present application. As shown in Figures 1 to 5 the embodiment of the present application provides a static pressure sampling device suitable for downhole operation, which comprises a drill bit 1, a driving cylinder 2 and a sampling piston pipe 3.

[0026] The drill bit 1 is internally provided with a coaxially arranged sampling hole 11, the driving cylinder 2 is arranged in the sampling hole 11, one end of the driving cylinder 2 is connected with the outside through the bottom opening of the sampling hole 11, and the other end is used for connecting with an oil filling device. The sampling piston pipe 3 comprises a piston section 31 and a sampling pipe body 32 close to the bottom opening of the sampling hole 11, and the piston section 31 is slidably installed in the driving cylinder 2. The outer diameter of the sampling pipe body 32 is smaller than the inner diameter of the driving cylinder 2, the top of the sampling pipe body 32 is provided with a drainage opening 321 in communication with the outer sidewall, and the bottom opening of the sampling pipe body 32 is provided with an anti-backflow blade 322 which can be opened and closed internally.

[0027] In the embodiment of the utility model, the static pressure sampling device is integrally arranged at the most front end of the drill bit 1 of the drilling equipment, the driving cylinder 2 inside is detachably and slidably matched with the inner hole of the drill bit 1, after drilling operation is carried out to the specified sampling position by the drill bit 1 and the hole is swept, the driving cylinder 2 inside can be lowered from the most top end of the drill bit 1 to the bottom to start sampling operation. After starting sampling operation, oil is filled into the driving cylinder 2 inside from the top of the drill bit 1 by the oil filling device, the piston section 31 of the sampling piston pipe 3 is pushed out downward by oil pressure, the sampling pipe body 32 is stretched out from the bottom of the drill bit 1 and penetrates into the stratum structure at the sampling position. After contacting the stratum structure, the anti-backflow blade 322 at the bottom of the sampling pipe body 32 is pushed away by the sediment sample m, the sediment sample enters the inside of the sampling pipe body 32, forms a sealed structure between the inside and the top while filling the inside of the sampling pipe body 32, the water body that surges together is discharged to the outside through the water outlet 321 at the top and is discharged away from the drill bit 1 through the gap between the sampling pipe body 32 and the inner wall of the driving cylinder 2. After completing sampling penetration, oil supply to the driving cylinder 2 is stopped and oil return is started. At this time, the pressure from the seawater below exceeds the oil pressure in the driving cylinder 2 above, the sampling piston pipe 3 is pushed upward as a whole, recovery is realized. At the same time, the sediment sample moves downward under the action of gravity, pushes the anti-backflow blade 322 downward and closes to the center, stores the sediment sample as a whole in the inside of the sampling pipe body 32, and finally recovers together with the drill bit 1 and the driving cylinder 2 to complete sampling.

[0028] The static pressure sampling device suitable for downhole operation provided by the embodiment of the utility model is adopted, the relatively movable nested sampling mechanism composed of the driving cylinder 2 and the sampling piston pipe 3 arranged inside the drill bit 1 is formed. After the drill bit 1 drills into the specified stratum position, the sampling piston pipe 3 is pushed downward by filling oil into the driving cylinder 2, the sediment sample pushes away the anti-backflow blade 322 and enters the inside of the sampling pipe body 32 for storage, and the inside water is discharged outward through the water outlet 321 at the top to ensure that the sediment sample can enter smoothly. Then, oil supply is stopped, the sampling piston pipe 3 is pushed upward by water pressure, and the sampling pipe body 32 is automatically closed by the gravity of the sediment sample. The whole process does not need the drill bit 1 to drill further, the sample is obtained by the static pressure method, and then the high-quality sediment sample m is obtained, and the surveying accuracy is improved.

[0029] Optionally, the inner diameter of the driving cylinder 2 is greater than the inner diameter of the sampling pipe body 32. Exemplarily, in the embodiment of the utility model, the inner diameter of the driving cylinder 2 is arranged to be greater than the inner diameter of the sampling pipe body 32, a gap is formed between the sampling pipe body 32 and the inner wall of the driving cylinder 2 for discharging the inside water away from the drill bit 1, because the cross-sectional area inside the driving cylinder 2 is greater than the inner cross-sectional area of the sampling pipe body 32, the penetration pressure is multiplied and improved when the sampling pipe body 32 is pushed out, and the sampling capacity is enhanced.

[0030] Optionally, the bottom of the sampling tube body 32 is provided with a cone segment 323, and the outer diameter of the cone segment 323 gradually decreases in the direction close to the bottom opening of the sampling hole 11. Exemplarily, in the embodiment of the utility model, the cone segment 323 is arranged at the front end of the sampling tube body 32, so that the sampling tube body 32 can be more smoothly penetrated into the stratum where the sediment sample is located after being ejected below the opening of the drill bit 1, and the sampling capacity is further enhanced.

[0031] Optionally, a one-way valve 324 is arranged in the drain port 321 and only conducts to the outer sidewall of the tube body. Exemplarily, in the embodiment of the utility model, the one-way valve 324 is arranged in the drain port 321 and only allows the water body to be discharged outward, so that the external water body is prevented from flowing backward during the sampling process, the reverse pressure inside the sampling tube body 32 is reduced during the downward penetration process, the sediment sample is ensured to be smoothly entered, and the sampling capacity is further improved.

[0032] Optionally, a sampling inner tube 325 is arranged in the sampling tube body 32, the anti-backflow blade 322 is arranged at the bottom of the sampling inner tube 325, and the sampling inner tube 325 is detachably connected with the sampling tube body 32. Exemplarily, in the embodiment of the utility model, the independent detachable sampling inner tube 325 is arranged in the sampling tube body 32, so that the sampling inner tube 325 can be independently detached after the sampling is completed, the sample is completely taken out, and the practicability is improved.

[0033] Optionally, a plurality of annular grooves 311 are arranged on the outer sidewall of the piston segment 31 in the axial direction, and a sealing ring 312 is arranged in the annular groove 311. Exemplarily, in the embodiment of the utility model, the plurality of annular grooves 311 are arranged on the outer sidewall of the piston segment 31 to sleeve the sealing ring 312, so that the assembly gap between the piston segment 31 and the inner wall of the driving cylinder 2 is sealed, the hydraulic oil and the seawater are prevented from leaking to each other, and the sealing property of the whole structure is ensured.

[0034] Optionally, a plurality of anti-backflow blades 322 are arranged and arranged in a spiral shape and overlapped with each other. Exemplarily, in the embodiment of the utility model, the anti-backflow blade 322 adopts a plurality of elastic blades overlapped with each other, and the whole arrangement is in a conical shape. When the sediment sample m is pushed from bottom to top, the anti-backflow blade 322 can be uniformly opened to facilitate the sample to pass through, or when the sediment sample m falls under the action of gravity, the anti-backflow blade 322 can be densely engaged to prevent the sample from falling out of the sampling tube body 32.

[0035] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "first", "second", and similar terms do not denote any order, quantity, or importance, but are used to distinguish one element from another, and the terms "a" or "an" do not denote a limitation of quantity but denote the presence of at least one. The terms "comprising", "including", and similar terms do not denote the presence of the elements or objects followed by the terms, but encompass the elements or objects followed by the terms, as well as equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "coupled" do not denote a direct or mechanical connection or coupling, but can include an electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and can change when the absolute positions of the described objects change.

[0036] The above description is only some optional embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A static pressure sampling device suitable for use in downhole operations, characterized by, The utility model relates to a drilling device, comprising: a drill bit (1), a driving cylinder (2) and a sampling piston tube (3), the drill bit (1) is internally provided with a coaxially arranged sampling hole (11), the driving cylinder (2) is arranged in the sampling hole (11), one end of the driving cylinder (2) is connected with the outside through the bottom opening of the sampling hole (11), the other end is used for being connected with an oil filling device, the sampling piston tube (3) comprises a piston section (31) and a sampling tube body (32) close to the bottom opening of the sampling hole (11), the piston section (31) is slidably installed in the driving cylinder (2), the outer diameter of the sampling tube body (32) is less than the inner diameter of the driving cylinder (2), the top of the sampling tube body (32) is provided with a drainage port (321) in communication with the outside wall, the bottom opening of the sampling tube body (32) is provided with anti-backflow blades (322) that can be arranged in the inside opening and closing.

2. The static pressure sampling device suitable for use in downhole operations of claim 1, wherein, The inner diameter of the driving cylinder (2) is greater than the inner diameter of the sampling tube body (32).

3. The static pressure sampling device suitable for use in downhole operations of claim 2, wherein, The bottom of the sampling tube body (32) is provided with a vertebral section (323), and the outer diameter of the vertebral section (323) gradually decreases in the direction close to the bottom opening of the sampling hole (11).

4. The static pressure sampling device suitable for use in downhole operations of claim 1, wherein, The drainage port (321) is provided with a one-way valve (324) that only guides the outside wall of the tube body.

5. The static pressure sampling device suitable for use in downhole operations of any of claims 1 to 4, wherein, The sampling tube body (32) is provided with a sampling inner tube (325), the anti-backflow blades (322) are arranged at the bottom of the sampling inner tube (325), and the sampling inner tube (325) is detachably connected with the sampling tube body (32).

6. The static pressure sampling device suitable for use in downhole operations of any of claims 1 to 4, wherein, The outer side wall of the piston section (31) is axially provided with a plurality of annular grooves (311), and the annular grooves (311) are provided with sealing rings (312).

7. The static pressure sampling device suitable for use in downhole operations of any of claims 1 to 4, wherein, The anti-backflow blades (322) are arranged in a plurality of spiral shapes and are arranged in an interlaced manner.

8. The static pressure sampling device suitable for use in downhole operations of any of claims 1 to 4, wherein, The driving cylinder (2) and the drill bit (1) are detachably connected.

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