Downhole sampling device for oil exploitation

Abstract

The utility model relates to the field of oil exploitation, in particular to an underground sampling device for oil exploitation. The underground sampling device for oil exploitation comprises a shell, the shell comprises a mounting pipe, the front end and the rear end of the mounting pipe are in threaded connection with an end socket and a tail pipe respectively, a plurality of through openings are formed in the outer side wall of the mounting pipe in a surrounding mode, and a hanging ring is fixedly mounted at the upper end of the end socket; a sampling barrel is slidably connected into the mounting pipe, the outer diameter of the sampling barrel is consistent with the inner diameter of the mounting pipe, the sampling barrel comprises a plurality of collecting barrels, collecting grooves are formed in the collecting barrels, liquid inlets communicated with the collecting grooves are formed in the outer side walls of the collecting barrels, and the collecting barrels are in threaded connection in sequence end to end. According to the device, petroleum at different depth layers in a well can be sampled for multiple times in one-time well descending operation, repeated well descending operation is not needed, compared with a traditional sampling mode, time and labor cost are greatly saved, and the working efficiency of petroleum sampling is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil exploitation, especially to an underground sampling device for oil exploitation. BACKGROUND

[0002] Oil exploitation refers to the behavior of excavating and extracting oil in the place where oil is stored. In the process of oil exploitation, oil and gas flow from the reservoir to the well bottom and then rise from the well bottom to the well mouth. Before oil exploitation, geological survey is needed, and after the survey is completed, drilling and oil extraction operations are carried out, and sampling operations are also carried out on oil. The traditional underground sampling is to connect the sampling tool to the drill pipe or cable and other downhole tools, and then lower it to the predetermined sampling depth. The opening and closing of the sampling cavity are controlled by the mechanical or hydraulic device of the tool to realize the collection of fluid. One-time sampling can only be carried out on the predetermined layer of oil. When multiple sampling is required, repeated operations are time-consuming and labor-intensive.

[0003] Therefore, it is necessary to provide a new underground sampling device for oil exploitation to solve the above technical problems. SUMMARY

[0004] To solve the above technical problems, the utility model provides an underground sampling device for oil exploitation which saves time and labor and has high working efficiency.

[0005] The underground sampling device for oil exploitation provided by the utility model comprises an outer shell, the outer shell comprises a mounting pipe, the front and rear ends of the mounting pipe are respectively threadedly connected with a head and a tail pipe, a plurality of through openings are arranged around the outer side wall of the mounting pipe, and a lifting ring is fixedly installed on the upper end of the head.

[0006] A sampling cylinder is slidably connected in the mounting pipe, the outer diameter of the sampling cylinder is consistent with the inner diameter of the mounting pipe, the sampling cylinder comprises a plurality of collection cylinders, a collection groove is formed in each of the plurality of collection cylinders, a liquid inlet is formed in the outer side wall of each collection cylinder and communicates with the collection groove, the plurality of collection cylinders are threadedly connected in sequence, and a cover is threadedly connected to the upper collection cylinder.

[0007] A driving mechanism for controlling the movement of the sampling cylinder is installed in the tail pipe.

[0008] Preferably, the driving mechanism comprises a gas cylinder, the gas cylinder is vertically fixed in the tail pipe, a piston rod is fixedly installed at the output end of the gas cylinder, and a special-shaped top plate is fixedly arranged at the end of the piston rod and abuts against the bottom of the sampling cylinder.

[0009] Preferably, a limiting spring is installed in the head, and the two ends of the limiting spring are arranged in abutment with the inner top of the head and the upper side wall of the cover, respectively, and the limiting spring is in a compressed state.

[0010] Preferably, a plurality of air guide pipes are fixedly installed around the outside of the mounting tube, and both ends of the air guide pipes are connected to the inside of the mounting tube and are respectively close to both ends of the mounting tube.

[0011] Preferably, a counterweight cone is fixedly connected to the end of the tail tube away from the mounting tube.

[0012] Preferably, an annular baffle is installed inside the tailpipe and sleeved on the cylinder, and the annular baffle is interference-fitted with the inner wall of the tailpipe.

[0013] Preferably, the bottom of the lowest collecting cylinder and the top of the cap are both fitted with an annular damping sealing gasket.

[0014] Compared with related technologies, the downhole sampling device for oil extraction provided by this utility model has the following advantages:

[0015] Beneficial effects:

[0016] 1. The device in this utility model can sample oil from different depths in a single well operation, eliminating the need for repeated well operations. Compared with traditional sampling methods, it greatly saves time and labor costs and improves the efficiency of oil sampling.

[0017] 2. This utility model can conveniently control the position of the sampling tube inside the outer shell through the drive mechanism, and can accurately place the sampling tube in different positions to meet different operational needs. For example, before the device is lowered into the well, the sampling tube is placed in the lower section of the installation pipe to close the opening. When the specified depth is reached, the inlet can be connected to the opening for sampling, which is convenient to operate. Attached Figure Description

[0018] Figure 1 A schematic diagram of a preferred embodiment of the downhole sampling device for oil extraction provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows the structural design of the outer casing;

[0020] Figure 3 for Figure 1 The diagram shows the internal structure of the outer shell;

[0021] Figure 4 for Figure 1 The diagram shows the structure of the tailpipe;

[0022] Figure 5 for Figure 1 The diagram shows the structure of the sampling tube.

[0023] Figure 6 for Figure 1 The diagram shows the structure of the drive mechanism.

[0024] Reference signs in the drawings: 1, housing; 11, mounting pipe; 12, end cap; 121, lifting ring; 122, limit spring; 13, tail pipe; 131, counterweight cone block; 132, annular partition; 14, through port; 15, air guide pipe; 2, sampling cylinder; 21, collection cylinder; 211, annular damping sealing gasket; 22, collection groove; 23, liquid inlet; 24, cover; 3, driving mechanism; 31, air cylinder; 32, piston rod; 33, special-shaped top plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0026] The specific implementation of the utility model will be described in detail in combination with specific examples.

[0027] Please refer to Figures 1 to 6 The utility model embodiment provides a petroleum exploitation downhole sampling device, petroleum exploitation downhole sampling device includes: housing 1, housing 1 includes mounting pipe 11, and the front and rear two ends of mounting pipe 11 are respectively screwed with end cap 12 and tail pipe 13, and the outer side wall of mounting pipe 11 is provided with multiple through ports 14 around, and lifting ring 121 is fixedly installed on the upper end of end cap 12;Sampling cylinder 2 is slidably connected in mounting pipe 11, and the outer diameter of sampling cylinder 2 is consistent with the inner diameter of mounting pipe 11, and sampling cylinder 2 includes multiple collection cylinders 21, multiple collection cylinders 21 are all provided with collection groove 22, and the outer side wall of collection cylinder 21 is provided with liquid inlet 23 that is communicated with collection groove 22, and multiple collection cylinders 21 are sequentially screwed, and the cover 24 is screwed on the upper collection cylinder 21;Tail pipe 13 is installed with driving mechanism 3 that controls the movement of sampling cylinder 2.

[0028] It should be noted that: the front and rear ends of the installation pipe 11 are respectively threaded with end caps 12 and tail pipes 13, which seals the front and rear ends of the installation pipe 11. The drive mechanism 3 drives the sampling cylinder 2 to move inside the installation pipe 11. The sampling cylinder 2 is composed of multiple collection cylinders 21 connected end to end by threads, and the uppermost collection cylinder 21 is sealed to its collection groove 22 by a cap 24. This effectively prevents oil from entering the installation pipe 11 and the sampling cylinder 2 when not needed, ensuring the sealing of the device in the non-sampling state and avoiding oil leakage or impurities from affecting the sampling. The sampling cylinder 2 is composed of multiple collection cylinders 21 connected end to end by threads. This design allows for the selection of different numbers of collection cylinders 21 to form the sampling cylinder 2 according to actual needs, adapting to different depth ranges and sampling volume requirements. It offers strong flexibility and adaptability, meeting the needs of various downhole sampling scenarios. In actual operation, the drive mechanism 3 first adjusts the position of the sampling cylinder 2 inside the outer casing 1, ensuring the entire sampling cylinder 2 is positioned at the lower section of the mounting pipe 11. The cap 24 and the uppermost collection cylinder 21 seal the opening 14 on the mounting pipe 11, while the uppermost inlet 23 remains below the opening 14, preventing oil from passing through. The inlet 14 enters the installation pipe 11 or the sampling tube 2. The device is suspended by a suspension device and enters the well for sampling. When the device reaches the designated depth, the drive mechanism 3 adjusts the position of the sampling tube 2 inside the outer casing 1. Specifically, the inlet 23 on the uppermost collection tube 21 needs to connect with the inlet 14, exposing the collection groove 22 in the uppermost collection tube 21. Oil at this depth can then enter the collection groove 22 of the uppermost collection tube 21 through the inlet 14 and the inlet 23. After collection, the drive mechanism 3 controls the sampling tube 2 to rise, reaching a higher position. The uppermost inlet 23 is moved upwards, and the opening 14 is sealed through the outer wall of the uppermost collection cylinder 21. Then, the device is lowered to another depth of oil by the suspension equipment, and the above operation is continued, so that the second collection cylinder 21 can sample oil from another layer. After multiple samplings are completed, the opening 14 is sealed through the outer wall of the sampling cylinder 2. The device in this utility model can sample oil from different depths in a single well operation without repeated well operations. Compared with traditional sampling methods, it greatly saves time and labor costs and improves the efficiency of oil sampling.

[0029] In the embodiments of this utility model, please refer to Figure 3 and Figure 6 The drive mechanism 3 includes a cylinder 31, which is vertically fixed inside the tailpipe 13. A piston rod 32 is fixedly installed at the output end of the cylinder 31, and an irregularly shaped top plate 33 is fixed at the end of the piston rod 32, which abuts against the bottom of the sampling cylinder 2.

[0030] It should be noted that: the cylinder 31 controls the extension and retraction of the piston rod 32, thereby driving the irregular top plate 33 to move the sampling cylinder 2 inside the installation pipe 11. The driving mechanism 3 can conveniently control the position of the sampling cylinder 2 inside the outer shell 1, and can accurately place the sampling cylinder 2 in different positions to meet different operational needs. For example, before the device is lowered into the well, the sampling cylinder 2 is placed in the lower section of the installation pipe 11 with the closed port 14. When the device reaches the specified depth, the inlet 23 can be connected to the port 14 for sampling, which is convenient to operate.

[0031] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 A limiting spring 122 is installed inside the end cap 12, and the two ends of the limiting spring 122 are respectively abutted against the top of the end cap 12 and the upper side wall of the cover 24, and the limiting spring 122 is in a compressed state.

[0032] It should be noted that the sampling cylinder 2 is subjected to a downward pressure by the limiting spring 122 to ensure the stability of the sampling cylinder 2 inside the mounting tube 11.

[0033] In the embodiments of this utility model, please refer to Figure 1 and Figure 2 Multiple air guide pipes 15 are fixedly installed around the outside of the mounting pipe 11, and both ends of the air guide pipes 15 are connected to the inside of the mounting pipe 11 and are close to both ends of the mounting pipe 11 respectively.

[0034] It should be noted that after the device is assembled, when the sampling tube 2 closes the port 14, the inside of the installation tube 11 is in a balanced state. When the driving mechanism 3 drives the sampling tube 2 to move, it will inevitably cause changes in the internal pressure of the upper and lower sections of the installation tube 11, which will cause certain damage to the driving mechanism 3 and the outer shell 1 itself. The air guide tube 15 is used to connect the air inside the upper and lower ends of the installation tube 11, so as to stabilize the internal pressure of the device and protect the device.

[0035] In the embodiments of this utility model, please refer to Figure 1 and Figure 3 The tail pipe 13 is fixedly connected to a counterweight cone 131 at the end away from the mounting pipe 11; the counterweight cone enables the device to move down stably, thereby improving the stability of the device.

[0036] In the embodiments of this utility model, please refer to Figure 4 An annular baffle 132 is installed inside the tailpipe 13 and is sleeved on the cylinder 31. The annular baffle 132 is interference-fitted with the inner wall of the tailpipe 13. The cylinder 31 can be regarded as being connected to the tailpipe 13 through the annular baffle 132, which supports the cylinder 31 and improves the stability of the cylinder 31.

[0037] In the embodiments of this utility model, please refer to Figure 5 An annular damping sealing gasket 211 is fitted on the bottom of the lowest collection tube 21 and the top of the cap 24. The annular damping sealing gasket 211 improves the sealing between the upper and lower ends of the sampling tube 2 and the inner wall of the installation tube 11, and at the same time provides friction for the movement of the sampling tube 2 in the installation tube 11, ensuring that the sampling tube 2 can move stably in the installation tube 11.

[0038] The working principle of the downhole sampling device for oil extraction provided by this utility model is as follows:

[0039] The control drive mechanism 3 adjusts the position of the sampling cylinder 2 inside the outer casing 1, so that the entire sampling cylinder 2 is located at the lower section of the installation pipe 11. The cap 24 and the uppermost collection cylinder 21 seal the opening 14 on the installation pipe 11, and the uppermost inlet 23 is still located below the opening 14. Oil will not enter the installation pipe 11 or the sampling cylinder 2 through the opening 14. The device is suspended by a suspension device and enters the well for sampling. When the device reaches the designated depth, the control drive mechanism 3 adjusts the position of the sampling cylinder 2 inside the outer casing 1, that is, the inlet 23 on the uppermost collection cylinder 21 needs to be connected to the opening 14, so that the collection groove 22 in the uppermost collection cylinder 21 is exposed, and the oil at this level can pass through. The inlet 14 and the inlet 23 enter the collection trough 22 of the uppermost collection cylinder 21. After collection, the drive mechanism 3 controls the sampling cylinder 2 to rise, and the uppermost inlet 23 moves upward, sealing the inlet 14 through the outer wall of the uppermost collection cylinder 21. Then, the device continues to be controlled by the suspension equipment to move down to another depth of oil, and the above operation is continued, so that the second collection cylinder 21 can sample oil from another layer. After multiple samplings are completed, the inlet 14 is sealed through the outer wall of the sampling cylinder 2. The device in this utility model can sample oil from different depths in a single well operation without repeated well operations. Compared with traditional sampling methods, it greatly saves time and labor costs and improves the efficiency of oil sampling.

[0040] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A downhole sampling device for oil extraction, characterized in that, include: The outer casing (1) includes a mounting tube (11), with a head (12) and a tail tube (13) threadedly connected to the front and rear ends of the mounting tube (11), and multiple through holes (14) arranged around the outer side wall of the mounting tube (11). A lifting ring (121) is fixedly installed on the upper end of the head (12). The sampling tube (2) is slidably connected inside the installation tube (11). The outer diameter of the sampling tube (2) is the same as the inner diameter of the installation tube (11). The sampling tube (2) includes multiple collection tubes (21). Each of the multiple collection tubes (21) has a collection groove (22). The outer wall of the collection tube (21) has a liquid inlet (23) that communicates with the collection groove (22). The multiple collection tubes (21) are connected by threads at their ends. A cap (24) is threaded onto the upper collection tube (21). The tail tube (13) is equipped with a drive mechanism (3) for controlling the movement of the sampling tube (2).

2. The downhole sampling device for oil extraction according to claim 1, characterized in that, The drive mechanism (3) includes a cylinder (31), which is vertically fixed inside the tailpipe (13), and a piston rod (32) is fixedly installed at the output end of the cylinder (31). The end of the piston rod (32) is fixed with an irregularly shaped top plate (33) that abuts against the bottom of the sampling cylinder (2).

3. The downhole sampling device for oil extraction according to claim 1, characterized in that, A limiting spring (122) is installed inside the end cap (12), and the two ends of the limiting spring (122) abut against the top of the end cap (12) and the upper side wall of the cover (24) respectively. The limiting spring (122) is in a compressed state.

4. The downhole sampling device for oil extraction according to claim 1, characterized in that, Multiple air guide pipes (15) are fixedly installed around the outside of the mounting pipe (11), and both ends of the air guide pipes (15) are connected to the inside of the mounting pipe (11) and are close to both ends of the mounting pipe (11).

5. The downhole sampling device for oil extraction according to claim 1, characterized in that, The tail tube (13) is fixedly connected to a counterweight cone (131) at the end away from the mounting tube (11).

6. The downhole sampling device for oil extraction according to claim 2, characterized in that, The tailpipe (13) is equipped with an annular baffle (132) sleeved on the cylinder (31), and the annular baffle (132) is interference-fitted with the inner wall of the tailpipe (13).

7. The downhole sampling device for oil extraction according to claim 1, characterized in that, An annular damping sealing gasket (211) is fitted on the bottom of the lowest collection tube (21) and the top of the cap (24).

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