CN110685613A - Tubular column device and oil production system - Google Patents

Abstract

The invention provides a tubular column device and an oil production system, wherein the tubular column 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 which are arranged in an oil well, wherein an oil pumping driving device is arranged in the oil pipe, the upper end of the first pipe body is directly or indirectly communicated 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, second, and third aperture structures are different sizes; the first blind joint is arranged between the lower end of the first pipe body and the upper end of the second pipe body; the first packer is arranged between the lower end of the second pipe body and the upper end of the third pipe body. The invention can play a better sand control effect and can realize at least two-stage multi-stage sand control.

Description

Tubular column device and oil production system

Technical Field

The invention relates to the field of oil exploitation, in particular to a pipe column device and an oil extraction system.

Background

Oil extraction refers to the act of excavating and extracting oil in places where oil is stored.

In the process of oil exploitation, stratum sand production can cause the tubular column device of oil recovery to break down, wherein the sand production can cause the problems of valve sand loss, pump sticking, sand prevention pipe blockage and the like, and the normal production of the mechanical production well is seriously influenced. In the related art, a site where sand is likely to be produced is previously determined only by a manual regular inspection, and is thus processed.

However, the manual inspection and treatment method cannot effectively prevent the influence of the sand discharge problem on the column device.

Disclosure of Invention

The invention provides a tubular column device and an oil extraction system, which aim to solve the problem that sand production cannot be effectively prevented from influencing the tubular column device.

According to a first aspect of the invention, a pipe column device is provided, which comprises an oil pipe arranged in an oil well, a first pipe body, a first blind joint, a second pipe body, a first packer and a third pipe body, wherein an oil pumping driving device is arranged in the oil pipe, the upper end of the first pipe body is directly or indirectly communicated 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, second, and third aperture structures are different sizes;

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 used for separating the lower end of the first pipe body from the upper end of the second pipe body and enabling the annular channel outside the first pipe body to be communicated with the annular channel outside the second pipe body;

the first packer is arranged between the lower end of the second pipe body and the upper end of the third pipe body and used for isolating the annular channel outside the second pipe body from the annular channel outside the third pipe body during setting and enabling the lower end of the second pipe body to be communicated with the upper end of the third pipe body.

Optionally, the first blind joint further comprises a first sand-settling pipe connected to the lower end of the first pipe body, and the first sand-settling pipe is arranged between the lower end of the first pipe body and the first blind joint.

Optionally, the tubular column device further includes a first transition oil pipe connected to the lower end of the second tubular body, and the first transition oil pipe is disposed between the second tubular body and the first packer.

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

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

Optionally, the tubular column device further comprises a second blind joint, a fourth tubular body, a second packer and a fifth tubular 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 arranged between the lower end of the third pipe body and the upper end of the fourth pipe body, and is used for separating the lower end of the third pipe body from the upper end of the fourth pipe body and enabling an annular channel outside the third pipe body to be communicated with an annular channel outside the fourth pipe body;

the second packer is arranged between the lower end of the fourth pipe body and the upper end of the fifth pipe body and used for separating the annular channel outside the fourth pipe body from the annular channel outside the fifth pipe body when in setting and enabling the lower end of the fourth pipe body to be communicated with the upper end of the fifth pipe body.

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

Optionally, the tubular column device further includes a second transition oil pipe connected to the lower end of the fourth pipe body, the second transition oil pipe is disposed 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.

Optionally, the first pipe body, the third pipe body and the fifth pipe body are oil pipe sieve pipes, and the second pipe body and the fourth pipe body are sand control pipes.

According to a second aspect of the present invention, there is provided an oil recovery system comprising the tubing string arrangement of the first aspect and its alternatives.

The invention provides a tubular column device and an oil production system, wherein 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, so that oil entering from a third hole structure of the third pipe body can be transmitted to the second pipe body from the upper end, enters an annular channel at the outer side of the second pipe body through the second hole structure of the second pipe body, enters the first pipe body through the first hole structure of the first pipe body, is extracted from an oil pipe, can prevent sand and other unwanted solids or liquids in the oil from passing through while preventing the oil from passing through by using the hole structures, and further has better filtering effect, and simultaneously, the sizes of at least two hole structures in the first hole structure, the second hole structure and the third hole structure are different, the aim treatment of the gravels with different sizes is realized, and at least two-stage multilevel sand prevention can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic illustration of a tubular string apparatus in a first downhole operating condition in accordance with an embodiment of the present invention;

FIG. 2 is a schematic illustration of the configuration of a tubular string apparatus in a second downhole operating condition in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view showing the construction of a pipe string apparatus according to another embodiment of the present invention;

fig. 4 is a schematic diagram of the structure of an oil recovery system in an embodiment of the present invention.

Description of reference numerals:

1-a first tube;

2-a second tube;

3-a third tube;

4-a fourth tube;

5-a fifth tube;

6-oil pipe;

7-oil pumping driving device;

8-a first blind joint;

9-a second blind joint;

10-a first packer;

11-a second packer;

12-a first sand trap;

13-a first transition oil pipe;

14-a second sand trap;

15-a second transition oil pipe;

16-a third sand trap;

17-an oil well;

18-a well control device;

19-hanging the oil pipe;

20-oil pay zone;

21-oil pumping unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

FIG. 1 is a schematic illustration of a tubular string apparatus in a first downhole operating condition in accordance with an embodiment of the present invention; FIG. 2 is a schematic illustration of the configuration of a tubular string device in a second downhole operating condition in accordance with an embodiment of the present invention.

Referring to fig. 1, the pipe string device includes an oil pipe 6 disposed in an oil well 17, a first pipe 1, a first blind joint 8, a second pipe 2, a first packer 10, and a third pipe 3.

The first pipe body 1, the second pipe body 2 and the third pipe body 3 can be understood as pipe structures capable of realizing liquid circulation between two ends, meanwhile, the pipe wall of the first pipe body 1 is provided with a first hole structure, the pipe wall of the second pipe body 2 is provided with a second hole structure, and the pipe wall of the third pipe body 3 is provided with a third hole structure. Through the hole structure, liquid or partial solid can circulate inside and outside the tube body.

Wherein the pipe wall can be understood as the side part of the pipe body; the pore structure can contain any number of pores, and the pores are understood to be any pores which can play a role in blocking solids with specific sizes, and the shapes and the sizes of the pores can be changed randomly according to requirements.

The upper end of the first pipe body 1 is directly or indirectly communicated to the lower end of the oil pipe 6. In the embodiment illustrated in fig. 1 and 2, the upper end of the first pipe 1 is directly connected to the lower end of the oil pipe 6, so that the oil introduced into the first pipe 1 can be transferred to the oil pipe 6 and then sent out. Tubing 6 may be connected to the wellhead of well 17 by tubing hanger 19.

The oil pumping driving device 7 can be arranged in the oil pipe 6 or between the oil pipe 6 and the first pipe body 1, the oil pumping driving device 7 can be any device capable of providing flowing power for liquid, and the oil pumping driving device can further provide driving force under the driving of other devices. For example, the oil pumping drive 7 may be an oil pump, which may be connected to an oil pumping unit 21.

The first blind joint 8 is arranged between the lower end of the first pipe body 1 and the upper end of the second pipe body 2, and is used for separating the lower end of the first pipe body 1 from the upper end of the second pipe body 2 and enabling the annular channel on the outer side of the first pipe body 1 to be communicated with the annular channel on the outer side of the second pipe body 2.

The annular channel outside the first pipe body 1 can be understood as a space between the first pipe body 1 and the well wall of the oil well 17, the annular channel outside the second pipe body 2 can be understood as a space between the second pipe body 2 and the well wall of the oil well 17, meanwhile, the space between the outer sides of the first blind joint 8 and the well wall of the oil well 17 can also be understood as an annular channel outside the first blind joint 8, if other components are further arranged on the upper side of the first packer 10, the space between the first packer 10 and the oil well 17 can also be understood as a corresponding annular channel, and therefore, the annular channels on the upper side of the first packer 10 can be communicated to form a first annular cavity.

The first packer 10 is arranged between the lower end of the second pipe body 2 and the upper end of the third pipe body 3, and is used for isolating the annular channel outside the second pipe body 2 from the annular channel outside the third pipe body 3 during setting, and enabling the lower end of the second pipe body 2 to be communicated with the upper end of the third pipe body 3.

The space between the outside of the components on the underside of the first packer 10 and the wall of the well 17 can be understood as an annular channel, which communicates to form a second annular chamber.

Through first blind joint 8, and the effect of first packer 10 can be so that the fluid that the third pore structure of third body 3 got into can be transmitted to second body 2 from the upper end to the annular channel in its outside is got into to the second pore structure through second body 2, enters into first annular chamber promptly, and then enters into first body 1 through the first pore structure of first body 1 again through first annular chamber, and then is taken out from oil pipe 6, and simultaneously, the transmission of fluid can be by oil pumping drive arrangement 7 provides drive power.

Furthermore, oil is at this in-process, and the first pore structure, the second pore structure and the third pore structure of usable first body 1, second body 2, third body 3 utilize this pore structure can block grit or other granule in the oil to pass through when the guarantee oil passes through, and then play the sand control effect of preferred.

Wherein the sizes of at least two of the first, second, and third aperture structures are different; because of the difference of this size, can realize the pertinence to grit or other granule of equidimension not handling, and then can realize the multistage sand control of at least two-stage.

In the embodiment shown in fig. 1 and 2, the lower side of the third tubular body 3 is directly used for oil production, so that the first tubular body 1 is a tubing screen, the second tubular body 2 and the third tubular body 3 are sand control pipes, and the size of the second hole structure is smaller than that of the third hole structure.

Therefore, by utilizing the third pipe body 3 and the third hole structure, the sand control pipe with low fineness can be utilized to filter sand with relatively large grains, so that most of the sand can be blocked, and the liquid is ensured not to be blocked, thereby smoothly circulating; utilize second body 2 and second pore structure, the grit of relatively less granule is filtered to the sand prevention pipe of usable high fineness degree, prevents that the grit of granule from getting into oil pipe 6 and oil pumping drive arrangement 7, avoids producing the influence to equipment such as oil pumping drive arrangement 7. Through the two-layer filtration of two sand control pipes, can filter large granule grit and tiny particle grit in proper order to make finally not persist the sand grain that influences production in the oil that flows into in the first body 1 as the oil pipe screen pipe.

Therefore, the embodiment combines the analysis of oil reservoir physical properties and rock characteristics, and sand control pipes with different fineness are adopted according to the rock granularity grading and proportion conditions of the production well, so that targeted grading sand control can be performed, the sand control effect during oil extraction is improved, single-well maintenance work is reduced, the single-well production cycle is prolonged, and single-well benefit-creating continuous production operation is ensured.

In the embodiment shown in fig. 1 and 2, the pipe string apparatus may further include a first sand trap 12 connected to a lower end of the first pipe body 1, the first sand trap 12 being disposed between the lower end of the first pipe body 1 and the first blind joint 8. The pipe string device may further include a second sand trap 14, and the second sand trap 14 is connected to a lower end of the third pipe body 3. Through first sand setting pipe 12 and second sand setting pipe 14, can be favorable to including but not limited to the material deposit of grit, fatlute in first body 1 and the third body 3, avoid its deposit in first body 1 and third body 3 to influence the circulation of fluid. Wherein the above-mentioned substances in the first pipe body 1 can be deposited downward on the first blind joint 8 so as to be located in the first sand trap 12, and the above-mentioned substances in the third pipe body 3 can be deposited downward in the second sand trap 14.

In the embodiment shown in fig. 1 and 2, the tubular string device may further comprise a first transition oil pipe 13 connected to the lower end of the second tubular body 2, wherein 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, namely: so that the oil in the third pipe 3 enters the second pipe 2 through the first packer 10 and the first transition oil pipe 13, and at the same time, it can also be beneficial to make the substances including but not limited to sand and oil sludge in the oil slowly move downwards so as to be deposited to the second sand trap 14.

The embodiment shown in fig. 1 and 2 may specifically work according to the following principle:

referring to fig. 1, the tubular string device may be lowered into the well 17 such that the second sand trap 14 is located near the bottom of the well, and after the tubular string device is lowered into the well to a predetermined position, referring to fig. 2, the first packer 10 may be set, the first packer 10 divides the well into an upper annular space and a lower annular space, i.e., the first annular space and the second annular space, which are mentioned above, and the second annular space is communicated with the bottom of the well. The third pipe body 3 as the primary sand control pipe is positioned in the second annular cavity, and the second pipe body 2 as the secondary sand control pipe is positioned in the first annular cavity. The pumping unit 21 and the well control equipment 18 are installed at the wellhead of the oil well 17, and after the pumping unit 21 is connected with the oil pumping driving device 7 such as an oil well pump in a pipe column device, the pumping unit 21 can drive the oil pumping driving device 7 to pump oil in the well, and the well control equipment 18 can be used for preventing and controlling blowout.

When the pumping unit 21 is started to recover oil, oil in an oil production layer 20 at the bottom of a well enters the third pipe body 3 serving as a primary sand prevention pipe, large-particle sand in the oil is prevented from entering the pipe by the third hole structure on the pipe wall, the oil flows into the second pipe body 2 serving as a secondary sand prevention pipe after flowing through the first packer 10 and the first transition oil pipe 13 upwards under the action of pumping force, the oil can flow into the first annular cavity from the second hole structure of the second pipe body 2 due to the plugging of the first blind joint 8, small-particle sand in the oil is prevented from entering the first annular cavity by the second hole structure, sand remained in the pipe can sink into the second sand settling pipe 14, sand influencing production is filtered out from the oil in the first annular cavity at the moment, and the oil enters the oil pipe 6 through the first pipe body 1 serving as a first oil pipe screen pipe and is pumped out.

The present embodiment provides a tubular column device and an oil production system, wherein the first blind joint is disposed between the lower end of the first tubular body and the upper end of the second tubular body, and the first packer is disposed between the lower end of the second tubular body and the upper end of the third tubular body, so that oil entering from the third hole structure of the third tubular body can 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 enter the first tubular body through the first hole structure of the first tubular body, and then be pumped out from the oil pipe, and the oil can be prevented from passing through sand and other unwanted solids or liquids in the oil while the oil is prevented from passing through the hole structure, so as to achieve better sand prevention and filtration effects, and at the same time, the sizes of at least two hole structures in the first hole structure, the second hole structure and the third hole structure are different, the aim treatment of the gravels with different sizes is realized, and at least two-stage multilevel sand prevention can be realized.

FIG. 3 is a schematic diagram of the structure of a tubing string device according to another embodiment of the present invention.

Referring to fig. 3, this embodiment can be understood as a variation of the embodiment shown in fig. 1 and 2, and the embodiment shown in fig. 1 and 2 can be applied to an oil well with a sand setting pocket downhole, and for an oil well without a sand setting pocket or with a deeper depth, the oil production zone 20 is closer to the cement plug downhole, and the embodiment shown in fig. 3 can be applied, so as to more effectively prevent sand setting from blocking the oil production zone 20.

Referring to fig. 3, on the basis of the embodiments shown in fig. 1 and fig. 2, the pipe column apparatus 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;

the second blind joint 9 is disposed between the lower end of the third pipe 3 and the upper end of the fourth pipe 4, and is configured to isolate the lower end of the third pipe 3 from the upper end of the fourth pipe 4, and enable the annular passage outside the third pipe 3 to be communicated with the annular passage outside the fourth pipe 4.

The function served by the second blind joint 9 can be understood with reference to the first blind joint 8.

The second packer 11 is arranged between the lower end of the fourth pipe 4 and the upper end of the fifth pipe 5, and is used for separating the annular channel outside the fourth pipe 4 from the annular channel outside the fifth pipe 5 when setting, and enabling the lower end of the fourth pipe 4 to be communicated with the upper end of the fifth pipe 5.

Furthermore, the annular channel on the upper side of the second packer 11, on the lower side of the first packer 10, may form a second annular chamber as described above, and the space on the lower side of the second packer 11 may be distinguished from the second annular chamber and defined as a third annular chamber.

The function served by the second packer 11 can be understood with reference to the first packer 10.

In one embodiment, the pipe string device further includes a third sand trap 16, and the third sand trap 16 is connected to the lower end of the fifth pipe body 5. The function of which can be understood with reference to the first and second sand sediment tubes 12 and 14.

Optionally, the pipe string device further includes a second transition oil pipe 15 connected to the lower end of the fourth pipe 4, and the second transition oil pipe 15 is disposed between the fourth pipe 4 and the second packer 11. The function of which can be understood with reference to the first transition oil pipe 13. Specifically, the second transition oil pipe 15 can realize the ascending of oil, namely: so that the oil in the fifth pipe 5 enters the fourth pipe 4 through the second packer 11 and the second transition oil pipe 15, and at the same time, it is also beneficial to make the substances including but not limited to sand and oil sludge in the oil slowly move downwards so as to be deposited to the third sand trap 16.

The differences between the embodiment shown in fig. 1 and 2 and the embodiment shown in fig. 3 include the following additional devices:

the first pipe body 1, the third pipe body 3 and the fifth pipe body 5 are oil pipe sieve pipes, 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.

It can be seen that in the embodiment shown in fig. 1 and 2, the third tubular body 3 is used as a primary sand control pipe, and the second tubular body 2 is used as a secondary sand control pipe. In the embodiment shown in fig. 3, the fourth pipe 4 is used as the primary sand control pipe, and the second pipe 2 is used as the secondary sand control pipe.

Similar to the effect of the third tube 3 and the third hole structure, and the effect of the second tube 2 and the second hole structure in the embodiments shown in fig. 1 and 2, in this embodiment, the fourth tube 4 and the fourth hole structure can be used to filter relatively large sand particles by using a low-fineness sand-prevention tube, so as to block most of the sand particles and ensure that the liquid is not blocked, thereby smoothly circulating; utilize second body 2 and second pore structure, the grit of relatively less granule is filtered to the sand prevention pipe of usable high fineness degree, prevents that the grit of granule from getting into oil pipe 6 and oil pumping drive arrangement 7, avoids producing the influence to equipment such as oil pumping drive arrangement 7. Through the two-layer filtration of two sand control pipes, can filter large granule grit and tiny particle grit in proper order to make finally not persist the sand grain that influences production in the oil that flows into in the first body 1 as the oil pipe screen pipe.

Therefore, the embodiment combines the analysis of oil reservoir physical properties and rock characteristics, and sand control pipes with different fineness are adopted according to the rock granularity grading and proportion conditions of the production well, so that targeted grading sand control can be performed, the sand control effect during oil extraction is improved, single-well maintenance work is reduced, the single-well production cycle is prolonged, and single-well benefit-creating continuous production operation is ensured.

Meanwhile, the operation principle and the effect of the first pipe 1, the second pipe 2, the oil pipe 6, the oil pumping driving device 7, the first blind joint 8, the first packer 10, the first sand trap 12, the first transition oil pipe 13 and the second sand trap 14 can be understood by referring to the embodiment shown in fig. 1 and 2.

The embodiment shown in fig. 3 may specifically work according to the following principle:

referring to fig. 3, the tubular string device may be first lowered into the well 17 to set the first packer 10 and the second packer 11, respectively, and the first packer 10 and the second packer 11 divide the well into a first annular chamber, a second annular chamber, and a third annular chamber. The pumping unit 21 and the well control equipment 18 are installed at the wellhead of the oil well 17, and after the pumping unit 21 is connected with the oil pumping driving device 7 such as an oil well pump in a pipe column device, the pumping unit 21 can drive the oil pumping driving device 7 to pump oil in the well, and the well control equipment 18 can be used for preventing and controlling blowout.

When oil extraction is carried out, oil in the underground oil production layer 20 enters the fifth pipe body 5 from the fifth hole structure of the fifth pipe body 5 serving as a third oil pipe screen pipe, the oil is difficult to block due to the fact that the screen holes of the oil pipe screen pipe are usually large, the oil upwards enters the fourth pipe body 4 serving as a primary sand prevention pipe under the action of suction force, the oil flows into the second annular cavity from the fourth hole structure of the fourth pipe body 4 serving as the primary sand prevention pipe due to the blocking of the second blind joint 9, the large-particle sand in the oil can be prevented from entering the second annular cavity by the fourth hole structure, the large-particle sand remained in the pipe downwards sinks into the third sand settling pipe 16, the oil flowing into the second annular cavity enters the third pipe body 3 through the third hole structure of the third pipe body 3 serving as a second oil pipe screen pipe and upwards flows into the second pipe body 2 serving as a secondary sand prevention pipe, and due to the blocking of the first blind joint 8, the oil liquid flows into the first annular cavity from the second hole structure of the second pipe body 2, the second hole structure can prevent small-particle sand in the oil liquid from entering the first annular cavity, the small-particle sand left in the pipe sinks downwards into the second sand settling pipe 14, sand influencing production is filtered out of the oil liquid in the first annular cavity, and the oil liquid enters the first pipe body 1 through the first hole structure of the first pipe body 1 serving as a first oil pipe screen pipe and is pumped out of a wellhead.

The present embodiment provides a tubular column device and an oil production system, wherein the first blind joint is disposed between the lower end of the first tubular body and the upper end of the second tubular body, and the first packer is disposed between the lower end of the second tubular body and the upper end of the third tubular body, so that oil entering from the third hole structure of the third tubular body can 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 enter the first tubular body through the first hole structure of the first tubular body, and then be pumped out from the oil pipe, and the oil can be prevented from passing through sand and other unwanted solids or liquids in the oil while the oil is prevented from passing through the hole structure, so as to achieve better sand prevention and filtration effects, and at the same time, the sizes of at least two hole structures in the first hole structure, the second hole structure and the third hole structure are different, the aim treatment of the gravels with different sizes is realized, and at least two-stage multilevel sand prevention can be realized.

Fig. 4 is a schematic diagram of the structure of an oil recovery system in an embodiment of the present invention.

Referring to fig. 4, the oil recovery system includes: the above alternative embodiments relate to a tubular string device.

Specifically, the oil recovery system may further include: the pumping unit 21 and the well control device 18, the well control device 18 can be arranged at the wellhead of the oil well 17, the well control device 18 can be understood as a device for preventing and controlling a blowout, and the pumping unit 21 can be any device for providing a driving force for the oil pumping driving device 7.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", and the like, are used to indicate an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the position or element referred to must have a particular orientation, be of particular construction and operation, and thus, are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A pipe column device is characterized by comprising an oil pipe, a first pipe body, a first blind joint, a second pipe body, a first packer and a third pipe body, wherein the oil pipe, the first pipe body, the first blind joint, the second pipe body, the first packer and the third pipe body are arranged in an oil well; at least two of the first, second, and third aperture structures are different sizes;

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 used for separating the lower end of the first pipe body from the upper end of the second pipe body and enabling the annular channel outside the first pipe body to be communicated with the annular channel outside the second pipe body;

the first packer is arranged between the lower end of the second pipe body and the upper end of the third pipe body and used for isolating the annular channel outside the second pipe body from the annular channel outside the third pipe body during setting and enabling the lower end of the second pipe body to be communicated with the upper end of the third pipe body.

2. A pipe string apparatus according to claim 1, further comprising a first sand trap connected to a lower end of the first pipe body, the first sand trap being disposed between the lower end of the first pipe body and the first blind joint.

3. The string apparatus of claim 1, further comprising a first transition tubing coupled to a lower end of the second tubular body, the first transition tubing disposed between the second tubular body and the first packer.

4. A pipe string apparatus according to claim 1, further comprising a second sand trap connected to a lower end of the third pipe body.

5. A tubular string device according to any one of claims 1 to 4, characterized in that the first tubular body is a tubing screen, the second and third tubular bodies are sand control tubing, and the second aperture arrangement is smaller in size than the third aperture arrangement.

6. A tubular string device according to any one of claims 1 to 3 further comprising a second blind sub, a fourth tubular body, a second packer and a fifth tubular 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 arranged between the lower end of the third pipe body and the upper end of the fourth pipe body, and is used for separating the lower end of the third pipe body from the upper end of the fourth pipe body and enabling an annular channel outside the third pipe body to be communicated with an annular channel outside the fourth pipe body;

the second packer is arranged between the lower end of the fourth pipe body and the upper end of the fifth pipe body and used for separating the annular channel outside the fourth pipe body from the annular channel outside the fifth pipe body when in setting and enabling the lower end of the fourth pipe body to be communicated with the upper end of the fifth pipe body.

7. A pipe string device according to claim 6, further comprising a third sand trap connected to a lower end of the fifth pipe body.

8. The tubular string apparatus of claim 6, further comprising a second transition tubing coupled to a lower end of the fourth tubular body, the second transition tubing disposed between the fourth tubular body and the second packer, the second bore configuration having a size smaller than the fourth bore configuration.

9. The pipe string apparatus of claim 6, wherein the first, third and fifth tubular bodies are each a tubing screen, and the second and fourth tubular bodies are sand control pipes.

10. An oil recovery system comprising the pipe string device according to any one of claims 1 to 9.

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