Pipeline equipment and oil production system

Abstract

The present invention provides a tubular device and an oil production system, wherein the tubular device comprises an oil pipe, a first pipe body, a first blind joint, a second pipe body, a first packer and a third pipe body arranged in an oil well, wherein an oil pumping drive device is arranged in the oil pipe, wherein the upper end of the first pipe body is directly or indirectly connected to the lower end of the oil pipe, wherein the pipe wall of the first pipe body is provided with a first hole structure, the pipe wall of the second pipe body is provided with a second hole structure, and the pipe wall of the third pipe body is provided with a third hole structure; the sizes of at least two of the first hole structure, the second hole structure and the third hole structure are different; the first blind joint is arranged between the lower end of the first pipe body and the upper end of the second pipe body; and the first packer is arranged between the lower end of the second pipe body and the upper end of the third pipe body. The present invention can achieve a better sand control effect and can realize at least two levels of multi-stage sand control.

Description

Technical Field

[0001] The invention relates to the field of oil production, and in particular to a pipe column device and an oil production system. Background Art

[0002] Oil extraction refers to the act of digging and extracting oil from where it is stored.

[0003] During the oil production process, sand production in the formation can cause failures in the oil production pipe string device. Sand production can cause problems such as valve sand leakage, pump jamming, and sand control pipe blockage, which seriously affect the normal production of machine-produced wells. In the existing related technologies, the only way is to determine the possible sand production sites in advance through regular manual inspections and then deal with them.

[0004] However, manual inspection and processing methods cannot effectively prevent the impact of sand production on the pipe string device. Summary of the invention

[0005] The present invention provides a pipe column device and an oil production system to solve the problem that the influence of sand production on the pipe column device cannot be effectively prevented.

[0006] According to a first aspect of the present invention, a pipe string device is provided, comprising an oil pipe, a first pipe body, a first blind joint, a second pipe body, a first packer and a third pipe body arranged in an oil well, wherein an oil pumping drive device is arranged in the oil pipe, the upper end of the first pipe body is directly or indirectly connected to the lower end of the oil pipe, a first hole structure is arranged on the pipe wall of the first pipe body, a second hole structure is arranged on the pipe wall of the second pipe body, and a third hole structure is arranged on the pipe wall of the third pipe body; the sizes of at least two of the first hole structure, the second hole structure and the third hole structure are different;

[0007] The first blind joint is disposed between the lower end of the first tube body and the upper end of the second tube body, and is used to separate the lower end of the first tube body from the upper end of the second tube body, and to allow the annular channel outside the first tube body to communicate with the annular channel outside the second tube body;

[0008] The first seal is arranged between the lower end of the second tube body and the upper end of the third tube body, and is used to separate the annular channel outside the second tube body from the annular channel outside the third tube body when setting the seal, and to keep the lower end of the second tube body and the upper end of the third tube body connected.

[0009] Optionally, it further includes a first sand settling pipe connected to the lower end of the first tube body, and the first sand settling pipe is arranged between the lower end of the first tube body and the first blind joint.

[0010] Optionally, the tubing string device further includes a first transition oil pipe connected to the lower end of the second tubing body, and the first transition oil pipe is arranged between the second tubing body and the first packer.

[0011] Optionally, the pipe column device further includes a second sand settling pipe, and the second sand settling pipe is connected to the lower end of the third pipe body.

[0012] Optionally, the first pipe body is an oil pipe screen, the second pipe body and the third pipe body are both sand control pipes, and the size of the second hole structure is smaller than that of the third hole structure.

[0013] Optionally, the tubular string device further comprises a second blind joint, a fourth tubular body, a second packer and a fifth tubular body; the wall of the fourth tubular body is provided with a fourth hole structure, and the wall of the fifth tubular body is provided with a fifth hole structure;

[0014] The second blind joint is disposed between the lower end of the third tube body and the upper end of the fourth tube body, and is used to separate the lower end of the third tube body from the upper end of the fourth tube body, and to allow the annular channel outside the third tube body to communicate with the annular channel outside the fourth tube body;

[0015] The second seal is arranged between the lower end of the fourth tube body and the upper end of the fifth tube body, and is used to separate the annular channel outside the fourth tube body from the annular channel outside the fifth tube body when setting the seal, and to keep the lower end of the fourth tube body and the upper end of the fifth tube body connected.

[0016] Optionally, the pipe column device further includes a third sand settling pipe, and the third sand settling pipe is connected to the lower end of the fifth pipe body.

[0017] Optionally, the tubing string device further includes a second transition oil pipe connected to the lower end of the fourth tubing body, the second transition oil pipe is arranged between the fourth tubing body and the second sealer, and the size of the second hole structure is smaller than the size of the fourth hole structure.

[0018] Optionally, the first tube body, the third tube body and the fifth tube body are all oil pipe screens, and the second tube body and the fourth tube body are sand control tubes.

[0019] According to a second aspect of the present invention, there is provided an oil production system, comprising the tubing device involved in the first aspect and its optional solutions.

[0020] The tubing device and oil production system provided by the present invention, through the first blind joint being arranged between the lower end of the first tubular body and the upper end of the second tubular body, and the first seal being arranged between the lower end of the second tubular body and the upper end of the third tubular body, can enable the oil entering from the third hole structure of the third tubular body to be transmitted from the upper end to the second tubular body, and enter the annular channel outside the second tubular body through the second hole structure of the second tubular body, and then enter into the first tubular body through the first hole structure of the first tubular body, and then be extracted from the oil pipe. The hole structure can be used to ensure the passage of oil while blocking the passage of sand and gravel and other unnecessary solids or liquids in the oil, thereby achieving better sand prevention and filtering effects. At the same time, the present invention also realizes targeted treatment of sand and gravel of different sizes through the different sizes of at least two hole structures among the first hole structure, the second hole structure and the third hole structure, thereby realizing at least two levels of multi-stage sand prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 is a schematic structural diagram of a pipe string device in a first downhole operation state according to an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a pipe string device in a second downhole operation state according to an embodiment of the present invention;

[0024] Figure 3 is a schematic structural diagram of a pipe column device in another embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of an oil production system in one embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1-The first tube body;

[0028] 2-Second tube body;

[0029] 3-Third tube body;

[0030] 4-The fourth tube body;

[0031] 5-The fifth tube body;

[0032] 6-Oil pipe;

[0033] 7-Oil pumping drive device;

[0034] 8-first blind connector;

[0035] 9- second blind connector;

[0036] 10-First packer;

[0037] 11-Second packer;

[0038] 12- first sand settling tube;

[0039] 13- first transition oil pipe;

[0040] 14- second sand settling tube;

[0041] 15- second transition oil pipe;

[0042] 16- the third sand settling tube;

[0043] 17-Oil wells;

[0044] 18- Well control equipment;

[0045] 19-Oil pipe hanger;

[0046] 20-Oil producing layer;

[0047] 21-Oil pumping unit. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0051] Figure 1 is a schematic structural diagram of a pipe string device in a first downhole operation state according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a pipe string device in a second downhole operation state according to an embodiment of the present invention.

[0052] Please refer to Figure 1 The tubular string device includes an oil pipe 6 arranged in an oil well 17, a first tubular body 1, a first blind joint 8, a second tubular body 2, a first packer 10 and a third tubular body 3.

[0053] The first tube body 1, the second tube body 2, and the third tube body 3 can be understood as a tube structure that can realize the flow of liquid between the two ends. At the same time, the tube wall of the first tube body 1 is provided with a first hole structure, the tube wall of the second tube body 2 is provided with a second hole structure, and the tube wall of the third tube body 3 is provided with a third hole structure. Through the hole structure, liquid or part of solid can flow inside and outside the tube body.

[0054] The tube wall can be understood as the side part of the tube body; the hole structure can include any number of holes, which are understood as any holes that can block solids of a specific size, and their shapes and sizes can be changed arbitrarily according to needs.

[0055] The upper end of the first tube body 1 is directly or indirectly connected to the lower end of the oil pipe 6. Figure 1 and Figure 2 In the illustrated embodiment, the upper end of the first pipe body 1 is directly connected to the lower end of the oil pipe 6, so that the oil entering the first pipe body 1 can be transferred to the oil pipe 6 and then sent out. The oil pipe 6 can be connected to the wellhead of the oil well 17 through the oil pipe hanger 19.

[0056] The oil pipe 6 or between the oil pipe 6 and the first pipe body 1 may be provided with an oil pumping drive device 7, which may be any device that can provide flow power for the liquid, and which may further provide driving force under the drive of other devices. For example, the oil pumping drive device 7 may be an oil pump, which may be connected to an oil pumping unit 21.

[0057] The first blind joint 8 is arranged between the lower end of the first tube body 1 and the upper end of the second tube body 2, and is used to separate the lower end of the first tube body 1 and the upper end of the second tube body 2, and to keep the annular channel outside the first tube body 1 and the annular channel outside the second tube body 2 connected.

[0058] The annular channel outside the first tube body 1 can be understood as the space between the first tube body 1 and the wall of the oil well 17, and the annular channel outside the second tube body 2 can be understood as the space between the second tube body 2 and the wall of the oil well 17. At the same time, the space between the outside of the first blind joint 8 and the wall of the oil well 17 can also be understood as the annular channel outside the first blind joint 8. If other components are provided on the upper side of the first packer 10, the space between them and the oil well 17 can also be understood as the corresponding annular channel. Therefore, the annular channels on the upper side of the first packer 10 can be connected to form a first annular cavity.

[0059] The first seal 10 is arranged between the lower end of the second tube body 2 and the upper end of the third tube body 3, and is used to separate the annular channel outside the second tube body 2 and the annular channel outside the third tube body 3 when sealing, and to keep the lower end of the second tube body 2 and the upper end of the third tube body 3 connected.

[0060] The space between the outer sides of the components at the lower side of the first packer 10 and the well wall of the oil well 17 can be understood as an annular channel, and the annular channels are connected to form a second annular cavity.

[0061] Through the first blind joint 8 and the action of the first seal 10, the oil entering from the third hole structure of the third pipe body 3 can be transmitted from the upper end to the second pipe body 2, and enter the annular channel outside the second pipe body 2 through the second hole structure, that is, enter the first annular cavity, and then pass through the first annular cavity and then enter the first pipe body 1 through the first hole structure of the first pipe body 1, and then be pumped out from the oil pipe 6. At the same time, the transmission of the oil can be provided with driving force by the oil pumping drive device 7.

[0062] Furthermore, during this process, the oil can utilize the first hole structure, the second hole structure and the third hole structure of the first tube body 1, the second tube body 2 and the third tube body 3. The hole structure can ensure the passage of oil while blocking the passage of sand or other particles in the oil, thereby achieving a better sand prevention effect.

[0063] Among them, the sizes of at least two of the first pore structure, the second pore structure and the third pore structure are different; due to the difference in size, targeted treatment of sand or other particles of different sizes can be achieved, thereby achieving at least two levels of multi-level sand control.

[0064] exist Figure 1 and Figure 2 In the embodiment shown, the lower side of the third tube body 3 can be directly used for oil production, so the first tube body 1 is an oil pipe screen, the second tube body 2 and the third tube body 3 are both sand control tubes, and the size of the second hole structure is smaller than that of the third hole structure.

[0065] Therefore, by using the third tube body 3 and the third hole structure, a low-fineness sand control tube can be used to filter relatively large particles of sand and gravel, which can block most of the sand and gravel and ensure that the liquid is not blocked, so that it can flow smoothly; by using the second tube body 2 and the second hole structure, a high-fineness sand control tube can be used to filter relatively small particles of sand and gravel, preventing small particles of sand and gravel from entering the oil pipe 6 and the oil pumping drive device 7, and avoiding affecting the equipment such as the oil pumping drive device 7. Through the two-layer filtration of the two sand control tubes, large particles of sand and gravel and small particles of sand and gravel can be filtered in turn, so that the oil that finally flows into the first tube body 1 as the oil pipe screen will not retain sand particles that affect production.

[0066] It can be seen that the above implementation methods are combined with the analysis of reservoir physical properties and rock characteristics, and according to the rock particle size classification and proportion of the production wells, sand control pipes of different fineness are used to carry out targeted graded sand control, thereby improving the sand control effect during oil production, thereby reducing the maintenance work of a single well, extending the production cycle of a single well, so as to ensure the continuous production operation of a single well.

[0067] exist Figure 1 and Figure 2 In the illustrated embodiment, the pipe column device may further include a first sand settling pipe 12 connected to the lower end of the first pipe body 1, and the first sand settling pipe 12 is disposed between the lower end of the first pipe body 1 and the first blind joint 8. The pipe column device may further include a second sand settling pipe 14, and the second sand settling pipe 14 is connected to the lower end of the third pipe body 3. The first sand settling pipe 12 and the second sand settling pipe 14 can facilitate the deposition of materials including but not limited to sand and sludge in the first pipe body 1 and the third pipe body 3, and avoid their deposition in the first pipe body 1 and the third pipe body 3, thereby affecting the circulation of oil. Among them, the above-mentioned materials in the first pipe body 1 can be deposited downward on the first blind joint 8, so as to be in the first sand settling pipe 12, and the above-mentioned materials in the third pipe body 3 can be deposited downward in the second sand settling pipe 14.

[0068] exist Figure 1 and Figure 2 In the illustrated embodiment, the tubular column device may further include a first transition oil pipe 13 connected to the lower end of the second tubular body 2, and the first transition oil pipe 13 is disposed between the second tubular body 2 and the first packer 10. The first transition oil pipe 13 can realize the upward movement of oil, that is, the oil in the third tubular body 3 enters the second tubular body 2 through the first packer 10 and the first transition oil pipe 13, and at the same time, it can also facilitate the slow downward movement of materials including but not limited to sand and sludge in the oil, so as to be deposited in the second sand settling tube 14.

[0069] Figure 1 and Figure 2 The specific working principle of the embodiment shown may be:

[0070] Please refer to Figure 1 , first lower the pipe string device into the oil well 17 so that the second sand settling pipe 14 is located near the bottom of the well. After lowering it to the preset position in the well, please refer to Figure 2 , the first packer 10 can be set and sealed. The first packer 10 divides the well into two annuli, namely the first annular cavity and the second annular cavity mentioned above, and the second annular cavity is connected to the bottom of the well. The third tube body 3 as a primary sand control tube is located in the second annular cavity, and the second tube body 2 as a secondary sand control tube is located in the first annular cavity. After the pumping unit 21 and the well control equipment 18 are installed at the wellhead of the oil well 17, and the pumping unit 21 is connected to the pumping drive device 7 in the pipe string device, such as a pumping pump, the pumping unit 21 can drive the pumping drive device 7 to pump oil in the well, and the well control equipment 18 can be used to prevent and control blowouts.

[0071] When the pumping unit 21 is started to produce oil, the oil in the oil producing layer 20 at the bottom of the well enters the third pipe body 3 serving as a first-level sand control pipe. The third hole structure on the pipe wall prevents large particles of sand in the oil from entering the pipe. Under the action of suction, the oil flows upward through the first packer 10 and the first transition oil pipe 13, and then flows into the second pipe body 2 serving as a second-level sand control pipe. Due to the sealing of the first blind joint 8, the oil can flow from the second hole structure of the second pipe body 2 to the first annular cavity. The second hole structure prevents small particles of sand in the oil from entering the first annular cavity, and the sand and gravel remaining in the pipe can sink into the second sand settling pipe 14. At this time, the oil in the first annular cavity has filtered out the sand particles that affect production, and the oil enters the oil pipe 6 through the first pipe body 1 serving as the first oil pipe screen and is pumped out.

[0072] The tubing device and oil production system provided in this embodiment, by means of the first blind joint being arranged between the lower end of the first tubular body and the upper end of the second tubular body, and the first seal being arranged between the lower end of the second tubular body and the upper end of the third tubular body, can enable the oil entering from the third hole structure of the third tubular body to be transmitted from the upper end to the second tubular body, and enter the annular channel on the outside thereof through the second hole structure of the second tubular body, and then enter into the first tubular body through the first hole structure of the first tubular body, and then be extracted from the oil pipe. The hole structure can be used to ensure the passage of oil while blocking the passage of sand and gravel and other unnecessary solids or liquids in the oil, thereby achieving better sand prevention and filtering effects. At the same time, the present invention also realizes targeted treatment of sand and gravel of different sizes by means of the different sizes of at least two hole structures among the first hole structure, the second hole structure and the third hole structure, thereby realizing at least two levels of multi-stage sand prevention.

[0073] Figure 3 It is a schematic structural diagram of a pipe column device in another embodiment of the present invention.

[0074] Please refer to Figure 3 , this embodiment can be understood as Figure 1 and Figure 2 A variation of the embodiment shown in FIG. Figure 1 and Figure 2 The embodiment shown is applicable to oil wells with sand pockets in the well. For oil wells without sand pockets or with a deeper depth, the oil production layer 20 is closer to the cement plug in the well. Figure 3 The embodiment shown can further more effectively prevent sand deposition from clogging the oil production layer 20 .

[0075] Please refer to Figure 3 ,exist Figure 1 and Figure 2 On the basis of the embodiment shown, the pipe string device provided in this embodiment may further include: a second blind joint 9, a fourth pipe body 4, a second packer 11 and a fifth pipe body 5; the pipe wall of the fourth pipe body 4 is provided with a fourth hole structure, and the pipe wall of the fifth pipe body 5 is provided with a fifth hole structure;

[0076] The second blind joint 9 is arranged between the lower end of the third tube body 3 and the upper end of the fourth tube body 4, and is used to separate the lower end of the third tube body 3 and the upper end of the fourth tube body 4, and to keep the annular channel outside the third tube body 3 and the annular channel outside the fourth tube body 4 connected.

[0077] The role of the second blind joint 9 can be understood with reference to the first blind joint 8 .

[0078] The second seal 11 is arranged between the lower end of the fourth tube body 4 and the upper end of the fifth tube body 5, and is used to separate the annular channel outside the fourth tube body 4 from the annular channel outside the fifth tube body 5 when sealing, and to keep the lower end of the fourth tube body 4 and the upper end of the fifth tube body 5 connected.

[0079] Furthermore, the annular channel on the upper side of the second packer 11 and the lower side of the first packer 10 can form the second annular cavity mentioned above, and the space on the lower side of the second packer 11 can be distinguished from the second annular cavity and defined as a third annular cavity.

[0080] The role of the second packer 11 can be understood with reference to the first packer 10 .

[0081] In one embodiment, the pipe column device further comprises a third sand settling pipe 16, and the third sand settling pipe 16 is connected to the lower end of the fifth pipe body 5. The function of the third sand settling pipe 16 can be understood with reference to the first sand settling pipe 12 and the second sand settling pipe 14.

[0082] Optionally, the tubular column device further includes a second transition oil pipe 15 connected to the lower end of the fourth tubular body 4, and the second transition oil pipe 15 is arranged between the fourth tubular body 4 and the second packer 11. Its function can be understood with reference to the first transition oil pipe 13. Specifically, the second transition oil pipe 15 can realize the upward movement of oil, that is, the oil in the fifth tubular body 5 enters the fourth tubular body 4 through the second packer 11 and the second transition oil pipe 15. At the same time, it can also facilitate the slow downward movement of materials including but not limited to sand, gravel and sludge in the oil, so as to be deposited in the third sand settling tube 16.

[0083] Figure 1 and Figure 2 The embodiment shown and Figure 3 The differences of the illustrated embodiments include, in addition to the above additional devices, also the following:

[0084] The first pipe body 1, the third pipe body 3 and the fifth pipe body 5 are all oil pipe screens, the second pipe body 2 and the fourth pipe body 4 are sand control pipes, and the size of the second hole structure is smaller than that of the fourth hole structure.

[0085] It can be seen that in Figure 1 and Figure 2 In the embodiment shown, the third tube body 3 is used as the primary sand control tube, and the second tube body 2 is used as the secondary sand control tube. Figure 3 In the illustrated embodiment, the fourth tube body 4 is used as a primary sand control tube, and the second tube body 2 is used as a secondary sand control tube.

[0086] Similar to the third tube body 3 and the third hole structure, and the second tube body 2 and the second hole structure in Figure 1 and Figure 2 The effect of the embodiment shown is that in this embodiment, by using the fourth tube body 4 and the fourth hole structure, a low-fineness sand control tube can be used to filter relatively large particles of sand and gravel, which can block most of the sand and gravel and ensure that the liquid is not blocked, so that it can flow smoothly; by using the second tube body 2 and the second hole structure, a high-fineness sand control tube can be used to filter relatively small particles of sand and gravel, preventing small particles of sand and gravel from entering the oil pipe 6 and the oil pumping drive device 7, and avoiding affecting the equipment such as the oil pumping drive device 7. Through the two-layer filtration of the two sand control tubes, large particles of sand and gravel and small particles of sand and gravel can be filtered in turn, so that the oil that finally flows into the first tube body 1 as the oil pipe screen will not retain sand particles that affect production.

[0087] It can be seen that the above implementation methods are combined with the analysis of reservoir physical properties and rock characteristics, and according to the rock particle size classification and proportion of the production wells, sand control pipes of different fineness are used to carry out targeted graded sand control, thereby improving the sand control effect during oil production, thereby reducing the maintenance work of a single well, extending the production cycle of a single well, so as to ensure the continuous production operation of a single well.

[0088] At the same time, the working principles and effects of the first pipe body 1, the second pipe body 2, the oil pipe 6, the pumping drive device 7, the first blind joint 8, the first packer 10, the first sand settling pipe 12, the first transition oil pipe 13, and the second sand settling pipe 14 can be referred to. Figure 1 and Figure 2 The illustrated embodiments are understood.

[0089] Figure 3 The specific working principle of the embodiment shown may be:

[0090] Please refer to Figure 3 , the tubing string device can be lowered into the oil well 17 first, and the first packer 10 and the second packer 11 are set respectively, and the first packer 10 and the second packer 11 divide the well into a first annular cavity, a second annular cavity and a third annular cavity. After the pumping unit 21 and the well control equipment 18 are installed at the wellhead of the oil well 17, and the pumping unit 21 is connected to the oil pumping drive device 7 such as an oil pump in the tubing string device, the pumping unit 21 can drive the oil pumping drive device 7 to pump oil in the well, and the well control equipment 18 can be used to prevent and control blowouts.

[0091] During oil production, the oil of the downhole oil production layer 20 enters the fifth pipe body 5 from the fifth hole structure of the fifth pipe body 5 as the third oil pipe screen. Since the sieve holes of the oil pipe screen are usually large, they are not easily blocked. Under the action of suction, the oil enters the fourth pipe body 4 as the first-level sand control pipe upward. Due to the blocking of the second blind joint 9, the oil flows from the fourth hole structure of the fourth pipe body 4 as the first-level sand control pipe to the second annular cavity. The fourth hole structure can prevent large particles of sand in the oil from entering the second annular cavity. The large particles of sand remaining in the pipe sink downward into the third sand settling pipe 16 and flow into the oil in the second annular cavity. The liquid enters the third pipe body 3 through the third hole structure of the third pipe body 3 serving as the second oil pipe screen, and flows upward into the second pipe body 2 serving as the secondary sand control pipe. Due to the blocking of the first blind joint 8, the oil flows from the second hole structure of the second pipe body 2 to the first annular cavity. The second hole structure can prevent small particles of sand in the oil from entering the first annular cavity. The small particles of sand remaining in the pipe sink downward into the second sand settling pipe 14. At this time, the oil in the first annular cavity has filtered out the sand particles that affect production. The oil enters the first pipe body 1 through the first hole structure of the first pipe body 1 serving as the first oil pipe screen, and is pumped out of the wellhead.

[0092] The tubing device and oil production system provided in this embodiment, by means of the first blind joint being arranged between the lower end of the first tubular body and the upper end of the second tubular body, and the first seal being arranged between the lower end of the second tubular body and the upper end of the third tubular body, can enable the oil entering from the third hole structure of the third tubular body to be transmitted from the upper end to the second tubular body, and enter the annular channel on the outside thereof through the second hole structure of the second tubular body, and then enter into the first tubular body through the first hole structure of the first tubular body, and then be extracted from the oil pipe. The hole structure can be used to ensure the passage of oil while blocking the passage of sand and gravel and other unnecessary solids or liquids in the oil, thereby achieving better sand prevention and filtering effects. At the same time, the present invention also realizes targeted treatment of sand and gravel of different sizes by means of the different sizes of at least two hole structures among the first hole structure, the second hole structure and the third hole structure, thereby realizing at least two levels of multi-stage sand prevention.

[0093] Figure 4 It is a structural schematic diagram of an oil production system in one embodiment of the present invention.

[0094] Please refer to Figure 4 , an oil production system, comprising: a tubing device involved in each of the above optional embodiments.

[0095] Specifically, the oil production system may also include: an oil pump 21 and a well control device 18. The well control equipment 18 may be arranged at the wellhead of the oil well 17. The well control equipment 18 may be understood as a device for preventing and controlling blowouts. The oil pump 21 may be any device that provides driving force for the oil pumping drive device 7.

[0096] In the description of the present invention, it is necessary to understand that the terms used such as “center”, “length”, “width”, “thickness”, “top”, “bottom”, “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “horizontal”, “inside”, “outside”, “axial”, “circumferential”, etc. to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred position or component must have a specific direction, a specific structure and operation, and therefore cannot be understood as limiting the present invention.

[0097] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or can communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, so that the internal connection of two elements or the interaction relationship between two elements can be achieved. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipe string device, characterized in that: The invention comprises an oil pipe, a first pipe body, a first blind joint, a second pipe body, a first packer and a third pipe body arranged in an oil well, wherein an oil pumping drive device is arranged in the oil pipe, the upper end of the first pipe body is directly or indirectly connected to the lower end of the oil pipe, the pipe wall of the first pipe body is provided with a first hole structure, the pipe wall of the second pipe body is provided with a second hole structure, and the pipe wall of the third pipe body is provided with a third hole structure; at least two of the first hole structure, the second hole structure and the third hole structure have different sizes; The first blind joint is disposed between the lower end of the first tube body and the upper end of the second tube body, and is used to separate the lower end of the first tube body from the upper end of the second tube body, and to allow the annular channel outside the first tube body to communicate with the annular channel outside the second tube body; The first packer is disposed between the lower end of the second pipe body and the upper end of the third pipe body, and is used to separate the annular channel outside the second pipe body from the annular channel outside the third pipe body when setting, and to keep the lower end of the second pipe body connected to the upper end of the third pipe body; It also includes a first sand settling pipe connected to the lower end of the first pipe body, wherein the first sand settling pipe is disposed between the lower end of the first pipe body and the first blind joint; It also includes a first transition oil pipe connected to the lower end of the second pipe body, wherein the first transition oil pipe is arranged between the second pipe body and the first packer; It also includes a second blind joint, a fourth pipe body, a second packer and a fifth pipe body; the pipe wall of the fourth pipe body is provided with a fourth hole structure, and the pipe wall of the fifth pipe body is provided with a fifth hole structure; The second blind joint is disposed between the lower end of the third tube body and the upper end of the fourth tube body, and is used to separate the lower end of the third tube body from the upper end of the fourth tube body, and to allow the annular channel outside the third tube body to communicate with the annular channel outside the fourth tube body; The second packer is disposed between the lower end of the fourth pipe body and the upper end of the fifth pipe body, and is used to separate the annular channel outside the fourth pipe body from the annular channel outside the fifth pipe body when setting, and to keep the lower end of the fourth pipe body in communication with the upper end of the fifth pipe body; It also includes a second transition oil pipe connected to the lower end of the fourth pipe body, the second transition oil pipe is arranged between the fourth pipe body and the second packer, and the size of the second hole structure is smaller than that of the fourth hole structure.

2. The pipe column device according to claim 1, characterized in that: It also includes a second sand settling pipe, which is connected to the lower end of the third pipe body.

3. The pipe column device according to claim 1 or 2, characterized in that: The first pipe body is an oil pipe screen, the second pipe body and the third pipe body are both sand control pipes, and the size of the second hole structure is smaller than that of the third hole structure.

4. The pipe column device according to claim 1, characterized in that: It also includes a third sand settling pipe, which is connected to the lower end of the fifth pipe body.

5. The pipe column device according to claim 1, characterized in that: The first pipe body, the third pipe body and the fifth pipe body are all oil pipe screens, and the second pipe body and the fourth pipe body are sand control pipes.

6. An oil production system, characterized in that: A tubular column device comprising any one of claims 1 to 5.

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