Flexible continuous sucker rod closed traction operation oil extraction system

Abstract

The utility model discloses a flexible continuous sucker rod closed traction operation oil extraction system, and belongs to the technical field of oil extraction equipment. Comprising a rack, an oil pipe and a flexible continuous sucker rod, a sealing box body is arranged on the rack, the sealing box body is communicated with the oil pipe, a winching machine roller is rotationally arranged in the sealing box body, a winching machine gear motor used for driving the winching machine roller to rotate is arranged on one side of the sealing box body, and the flexible continuous sucker rod is wound on the winching machine roller. One end of the flexible continuous sucker rod is placed in the oil pipe and is connected with the pump positioned in the oil pipe, and the other end of the flexible continuous sucker rod is placed in the sealing pipe which is in sealing connection with the sealing box body. The flexible continuous sucker rod and the winching machine roller are fully sealed, so that the flexible continuous sucker rod does not need to be independently sealed, and rope arrangement is not needed; later maintenance is convenient, the structure is simple, the load is small, the size is small, the manufacturing and using cost is reduced, and meanwhile safety and environmental friendliness are improved through the fully-closed design.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production equipment, in particular to a flexible continuous pumping rod closed traction operation oil production system. Background Art

[0002] The rod pump oil pumping system has the advantages of simple structure and reliable performance, and is the most widely used in oil fields. However, it has disadvantages such as being bulky and heavy, having limited performance, high manufacturing cost, high cost of using and maintaining related parts, and high energy consumption. The rodless oil pumping unit has good energy-saving effect and is better adaptable in certain scenarios. However, due to its complex structure, high procurement cost and complex maintenance, its comprehensive advantages are not obvious, and it is difficult to promote it in mature markets.

[0003] In recent years, long-stroke, ultra-long-stroke, full-stroke and other oil pumping systems have appeared. The larger the stroke, the more advantages they have in alleviating problems such as stroke loss, eccentric wear, and strain, but they also have problems such as large size, high cost, and poor stability.

[0004] The bailing type oil production method, which has recently appeared, adopts a full-stroke oil production mode. Due to its unique characteristics that the load is the same as the produced liquid, it can effectively reduce the load on the pumping unit, thereby making the pumping unit miniaturized. It has many advantages such as less eccentric wear, strain, and expansion and contraction, simple operation, and even combined operation functions.

[0005] However, the current fixed-type lifting pumping units are rarely used because of the high cost of the flexible rods and the short service life of the pumps, which makes it difficult to reduce the complexity and cost of use and maintenance. The characteristics of the flexible continuous pumping rod make it possible to operate completely in a sealed space. At present, there is a patent CN201720035517, which discloses a closed lifting ring pumping device. Although it solves the problem of wellhead sealing of lifting equipment, there are problems such as the large sealing volume of the top of the equipment, the complex drum follower mechanism required for the rope arrangement (the drum has a diameter of about 0.8 meters, a length of about 0.9 meters, and needs to move along the axis, so the sealing volume is about twice that of the drum), severe multi-layer extrusion of the wire rope, the later maintenance of the equipment and how the produced fluid enters the gathering and transportation system, and another major problem, the effective life of the pump, has not been solved. Therefore, the pumping device itself has problems such as complex equipment structure, large volume (caused by the rope arrangement and winch-type drum seal), frequent and inconvenient maintenance, and needs to be further optimized.

[0006] In addition, due to the ultra-large stroke and low stroke frequency of the bailing type oil pumping, the relatively long static time will cause the oil and water in the produced fluid in the tubing to automatically separate, and the water content in the tubing will gradually increase from top to bottom. The conventional water sampling method has large errors. At the same time, the instantaneous displacement in a single stroke is high, and there is no flow during the interval. The current metering method is not suitable, the water content changes greatly, and the flow measurement is difficult, making the metering of the produced fluid a problem.

[0007] To this end, we have designed and developed a new type of flexible continuous sucker rod closed traction operation oil production system, which uses a capstan to realize the retraction and extension of the sucker rod. Since the capstan only needs a smaller capstan drum and does not need to be moved or roped, the sealing device is smaller in size, thereby realizing a low-cost, low-load, small-volume, and easy-to-maintain sealed lifting pumping unit; and the flexible rod is fully sealed to operate, solving the problem of difficulty in wellhead sealing, thereby solving the problem of complex manufacturing of the flexible rod. Utility Model Content

[0008] The utility model aims to provide a flexible continuous sucker rod closed traction operation oil production system to solve the problems raised in the above background technology.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A flexible continuous sucker rod closed traction operation oil production system, comprising a frame, an oil pipe and a flexible continuous sucker rod, a sealing box is arranged on the frame, a sealing tube is sealingly connected to the lower end of the sealing box, the sealing tube is sealingly connected to the oil pipe, a capstan drum is rotatably arranged in the sealing box, a capstan reduction motor for driving the capstan drum to rotate is arranged on one side of the sealing box, the flexible continuous sucker rod is wound around the capstan drum, and one end of the flexible continuous sucker rod is lowered into the oil pipe through the sealing tube and connected to a pump located in the oil pipe, a sealing member for limiting oil leakage is arranged on the upper end of the sealing tube, and the other end of the flexible continuous sucker rod is lowered into a sealing pipe fitting sealingly connected to the sealing box and is connected to a thick rope head.

[0011] As a further preferred solution of the utility model: it also includes a storage metering tank, the oil inlet of the storage metering tank is connected to the oil outlet of the oil pipe, and the oil outlet of the storage metering tank is connected to the gathering pipeline through a delivery pump.

[0012] As a further preferred solution of the utility model: the sealing pipe fitting is a connecting storage pipe which is sealed and connected to the sealing box body, the lower end of the connecting storage pipe is connected to the storage metering tank, one end of the flexible continuous sucker rod is lowered into the connecting storage pipe, and a one-way valve is provided in the connecting storage pipe to prevent the thick rope head and the flexible continuous sucker rod from falling into the storage metering tank.

[0013] As a further preferred solution of the utility model: the sealing pipe fitting is a sucker rod capillary tube sealedly connected to the lower end of the sealing box, a casing is provided on the outside of the oil pipe, an eccentric wellhead is provided on the casing, the lower end of the sucker rod capillary tube is sealably connected to the eccentric wellhead, and one end of the flexible continuous sucker rod is lowered into the oil casing annulus between the casing and the oil pipe through the sucker rod capillary tube.

[0014] As a further preferred solution of the utility model: a pressure roller is rotatably arranged in the sealing box, and the pressure roller is located on the outside of the capstan drum, and is used for squeezing the flexible continuous sucker rod wound on the capstan drum.

[0015] As a further preferred solution of the utility model: the sealing member is a sealing packing box arranged on the inner wall of the sealing tube, and the flexible continuous sucker rod passes through the central hole of the sealing packing box and is movably connected to the sealing packing box.

[0016] As a further preferred solution of the utility model: the upper end of the sealing tube is designed to be disconnected, and an outer sleeve threadedly connected to the upper and lower sealing tubes is provided at the disconnection point of the sealing tube, and the sealing packing box is arranged in the sealing tube located on the upper side of the outer sleeve.

[0017] As a further preferred solution of the utility model: an inner lining tube is arranged in the oil pipe to reduce the friction between the pump and the oil pipe.

[0018] As a further preferred solution of the utility model: the oil pipe is a continuous pipe.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The flexible continuous sucker rod and the capstan roller are fully sealed. There is no need to seal the flexible continuous sucker rod separately, which greatly reduces the manufacturing and sealing requirements of the flexible continuous sucker rod, thereby reducing the manufacturing and use costs. At the same time, the fully enclosed design increases safety and environmental protection;

[0021] 2. The pumping unit has a simple structure, small load, small size, stable operation, and convenient maintenance. It uses a capstan-type lifting and oil production method, and no longer requires a rope arrangement mechanism and a wellhead sealing mechanism, which reduces the complexity and size of the pumping unit, and at the same time reduces the overall sealing volume and sealing difficulty;

[0022] 3. The non-pressure placement and capstan grinding are used instead of the rewinding type repeated winding, which eliminates the problems of rope angle wear, multi-layer covering and mutual extrusion wear during the stretching process of the flexible continuous sucker rod during operation;

[0023] 4. The metering and storage problems of production wells with large stroke, low stroke frequency and low liquid volume, as well as the sealing problems of flexible rods and produced fluids are solved together to reduce the overall cost and equipment complexity of the oil production system;

[0024] 5. The oil pipe downhole is effectively reduced the friction between the pump and the inner wall of the oil pipe by setting an inner liner pipe or using a continuous oil pipe, thus extending the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a structural schematic diagram of Example 1 of the utility model of a flexible continuous sucker rod closed traction operation oil production system;

[0026] Figure 2 for Figure 1 An enlarged schematic diagram of the structure of the middle outer casing;

[0027] Figure 3 This is a schematic diagram of the main structure of Example 1 of the flexible continuous sucker rod closed traction operation oil production system of the utility model;

[0028] Figure 4 It is a schematic diagram of the structure of the wellhead device on the oil pipe;

[0029] Figure 5 It is a structural schematic diagram of Example 2 of the flexible continuous sucker rod closed traction operation oil production system of the utility model.

[0030] In the figure: 1. frame; 2. reduction motor of capstan mill; 3. drum of capstan mill; 4. sealing box; 5. pressure roller; 6. flexible continuous sucker rod; 7. connecting storage pipe; 8. thick rope head; 9. one-way valve; 10. storage and metering tank; 11. gathering and transportation pipeline; 12. delivery pump; 13. sealing pipe; 14. pump; 15. sealing packing box; 16. outer casing; 17. wellhead assembly; 18. oil flow pipe; 19. eccentric wellhead; 20. sucker rod capillary; 21. casing; 22. oil pipe. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0032] See also Figure 1-4The present embodiment provides a flexible continuous sucker rod closed traction operation oil production system, including a frame 1, an oil pipe 22 and a flexible continuous sucker rod 6. A sealing box 4 is arranged on the frame 1, and the sealing box 4 is communicated with the oil pipe 22. Specifically, a sealing pipe 13 is sealed and connected to the lower end of the sealing box 4, and the sealing pipe 13 is sealed and connected to the oil pipe 22. It should be noted that, as a conventional setting familiar to those skilled in the art, the oil pipe 22 is a pipe body arranged underground, and a casing 21 is arranged on the outside thereof. A capstan drum 3 is rotatably arranged in the sealing box 4, and a capstan reduction motor 2 for driving the capstan drum 3 to rotate is arranged on one side of the sealing box 4. A flexible continuous sucker rod 6 is wound around the capstan drum 3, and one end of the flexible continuous sucker rod 6 is lowered into the oil pipe 22 through the sealing tube 13 and connected to the pump 14 located in the oil pipe 22. A sealing member for limiting oil leakage is arranged at the upper end of the oil pipe 22. Specifically, the sealing member is preferably a sealing packing box 15 arranged on the inner wall of the sealing tube 13, and the flexible continuous sucker rod 6 passes through the sealing packing box The center hole of 15 is movably connected with the sealing packing box 15. It should be noted that the sealing packing box 15 is an existing general structure, which can greatly reduce the leakage of the produced liquid from the oil pipe 22 into the sealing tube 13 and enter the sealing box 4 from the top of the sealing tube 13, thereby reducing the corrosion of the winch drum 2 and the sealing box 4. The sealing packing box 15 can be directly obtained through customized purchase, which is the same as the existing sealing box and will not be repeated in this application. The other end of the flexible continuous sucker rod 6 is lowered into the sealing pipe fitting sealed with the sealing box 4, and is connected with a thick rope head 8.

[0033] At the same time, an inner liner pipe is arranged inside the oil pipe 22 downhole. The oil pipe 22 can also be designed as a continuous pipe according to the demand, which can effectively reduce the friction between the pump 14 and the inner wall of the oil pipe 22 and the oil pipe coupling, thereby extending the service life of the pump 14.

[0034] In order to facilitate the storage of produced liquid and to conveniently measure the amount of liquid and water content of the produced oil, the system is provided with a storage metering tank 10. The oil inlet of the storage metering tank 10 is connected to the oil outlet of the oil pipe 22. The oil discharged from the oil outlet of the oil pipe 22 preferentially enters the storage metering tank 10 for static storage. At the same time, the oil outlet of the storage metering tank 10 is connected to the gathering pipeline 11 through the delivery pump 12. After metering, the oil in the storage metering tank 10 is discharged through the gathering pipeline 11.

[0035] It should be noted that, as a conventional design familiar to those skilled in the art, Figure 3 As shown, the outlet of the oil pipe 22 should be designed with a wellhead device 17, and the wellhead device 17 is connected to the storage metering tank 10 through an oil outlet pipe 18. Figure 4 As shown, the wellhead device 17 should also be provided with common wellhead accessories such as casing gates, which will not be described in detail in this application.

[0036] In order to increase the contact area of ​​the coated flexible continuous sucker rod 6, thereby increasing the static friction force of the grinding process, reducing the wear and loss of the flexible continuous sucker rod 6, increasing the upper limit of the static friction force, further ensuring the transmission of the friction force, and increasing the bailing speed, the closed traction operation system uses a circulating rolling extrusion device, and a pressure roller 5 is rotatably arranged in the sealed box 4. The pressure roller 5 is located on the outside of the grinding machine drum 3 and is used to squeeze the flexible continuous sucker rod 6 wrapped around the grinding machine drum 3.

[0037] In this embodiment, the sealing pipe fitting is preferably a connecting storage pipe 7 that is sealingly connected to the sealing box body 4, the lower end of the connecting storage pipe 7 is connected to the storage metering tank 10, one end of the flexible continuous sucker rod 6 is lowered into the connecting storage pipe 7, and a one-way valve 9 is provided in the connecting storage pipe 7 to prevent the thick rope head 8 and the flexible continuous sucker rod 6 from falling into the storage metering tank 10.

[0038] The system adopts a capstan-type (friction-type) reel, and has an integrally sealed design for the flexible continuous pumping rod 6, and does not require a complicated rope arrangement device, which greatly reduces the structural complexity and volume of the pumping unit, and reduces the wear of the flexible continuous pumping rod.

[0039] In addition, since the sealing tube 13 is directly connected to the sealing box 4, if the sealing tube 13 is an integrated type, the maintenance of the drawer 14 is very difficult; Figure 2 As shown, the upper end of the sealing tube 13 adopts a disconnection design, and an outer sleeve 16 threadedly connected to the upper and lower sealing tubes 13 is provided at the disconnection of the sealing tube 13. The sealing packing box 15 is arranged in the sealing tube 13 located on the upper side of the outer sleeve 16, so that the sealing packing box 15 can be threadedly connected to the sealing tube 13; when the drawer 14 needs to be repaired, the outer sleeve 16 is rotated to move the outer sleeve 16 upward, and the outer sleeve 16 is separated from the sealing tube 13 below, and the drawer 14 can be lifted to the opening for inspection. In practical applications, considering that the outer sleeve 16 should remain stable during work, after the outer sleeve 16 is fixed, a clamping ring or other clamping parts can be fixedly mounted on the upper and lower sealing tubes 13 to limit and fix the two sides of the outer sleeve 16. This is a conventional operation familiar to those skilled in the art, and this application will not repeat it. Example 2

[0040] On the basis of Example 1, in this example, Figure 5As shown, the sealing pipe is designed to seal the sucker rod capillary 20 connected to the lower end of the sealing box 4, a casing 21 is arranged outside the oil pipe 22, an eccentric wellhead 19 is arranged on the casing 21, the lower end of the sucker rod capillary 20 is connected to the eccentric wellhead 19, and one end of the flexible continuous sucker rod 6 passes through the sucker rod capillary 20 and is lowered into the oil casing annulus between the casing 21 and the oil pipe 22 through the eccentric wellhead 19. Among them, the casing 21 and the eccentric wellhead 19 are conventional general structures familiar to those skilled in the art, and they are not described in detail.

[0041] In order to enable those skilled in the art to better understand the present application, the working principle of the system will be described below:

[0042] When in use, the capstan is driven to work, the capstan reduction motor 2 works, and the capstan drum 3 is driven to rotate, and the capstan drum 3 drives the flexible continuous sucker rod 6 and the pump 14 upward, and the pump 14 drives the liquid column of a certain height in the oil pipe 22 upward together, and the other end of the flexible continuous sucker rod 6 goes down along the connecting storage pipe 7 or the oil casing annulus, so as to realize the retraction and release of the flexible continuous rod; after the liquid level reaches the wellhead, it directly enters the storage metering tank 10 through the oil outlet of the oil pipe 22, and a very small part passes through the wellhead universal accessories and the sealing packing box 15 at a low speed and adheres to the flexible continuous sucker rod 6; if the connecting storage pipe 7 is a sealing pipe fitting, the produced oil attached to the flexible continuous sucker rod 6 can fall into the storage metering tank 10 through the one-way valve 9; if the sucker rod capillary 20 and the casing 21 are sealing pipe fittings, the produced oil adheres to the flexible continuous sucker rod 6, which does not affect the normal operation of the flexible continuous sucker rod 6.

[0043] Then the capstan drum 3 is reversed, driving the flexible continuous sucker rod 6 and the pump 14 downward to a certain depth below the liquid level and stop.

[0044] After the produced fluid enters the storage metering tank 10 , it is stored and the volume, quality and water content are measured, and then it directly enters the pipeline system through the delivery pump 12 and the gathering pipeline 11 .

[0045] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and technical features of the present application. For those skilled in the art, solutions or features that belong to the prior art or common knowledge are not described in detail in the above embodiments.

[0046] In addition, the technical solutions of the present application are not limited to the above-mentioned embodiments. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flexible continuous sucker rod closed traction operation oil production system, comprising a frame (1), an oil pipe (22) and a flexible continuous sucker rod (6), characterized in that: The frame (1) is provided with a sealing box (4), the lower end of the sealing box (4) is sealingly connected to a sealing tube (13), the sealing tube (13) is sealingly connected to an oil pipe (22), a capstan drum (3) is rotatably arranged in the sealing box (4), a capstan reduction motor (2) for driving the capstan drum (3) to rotate is arranged on one side of the sealing box (4), the flexible continuous pumping rod (6) is wound around the capstan drum (3), and one end of the flexible continuous pumping rod (6) is lowered into the oil pipe (22) through the sealing tube (13) and is connected to a pump (14) located in the oil pipe (22), the upper end of the sealing tube (13) is provided with a sealing member for limiting oil leakage, the other end of the flexible continuous pumping rod (6) is lowered into a sealing pipe member sealingly connected to the sealing box (4), and is connected to a thick rope head (8).

2. The flexible continuous sucker rod closed traction operation oil production system according to claim 1 is characterized in that: It also comprises a storage metering tank (10), the oil inlet of the storage metering tank (10) being connected to the oil outlet of the oil pipe (22), and the oil outlet of the storage metering tank (10) being connected to the gathering pipeline (11) via a delivery pump (12).

3. The flexible continuous sucker rod closed traction operation oil production system according to claim 2 is characterized in that: The sealing pipe member is a connecting storage pipe (7) which is sealedly connected to the sealing box (4); the lower end of the connecting storage pipe (7) is connected to the storage metering tank (10); one end of the flexible continuous pumping rod (6) is lowered into the connecting storage pipe (7); and a one-way valve (9) is provided in the connecting storage pipe (7) to prevent the thick rope head (8) and the flexible continuous pumping rod (6) from falling into the storage metering tank (10).

4. The flexible continuous sucker rod closed traction operation oil production system according to claim 2 is characterized in that: The sealing pipe member is a sucker rod capillary (20) sealedly connected to the lower end of the sealing box (4); a casing (21) is arranged outside the oil pipe (22); an eccentric wellhead (19) is arranged on the casing (21); the lower end of the sucker rod capillary (20) is sealedly connected to the eccentric wellhead (19); one end of the flexible continuous sucker rod (6) is lowered into the oil casing annulus between the casing (21) and the oil pipe (22) through the sucker rod capillary (20).

5. The flexible continuous sucker rod closed traction operation oil production system according to claim 1 is characterized in that: A pressure roller (5) is rotatably arranged in the sealing box (4); the pressure roller (5) is located outside the capstan drum (3) and is used to press the flexible continuous pumping rod (6) wound around the capstan drum (3).

6. The flexible continuous sucker rod closed traction operation oil production system according to claim 1 is characterized in that: The sealing element is a sealing packing box (15) arranged on the inner wall of the sealing tube (13), and the flexible continuous sucker rod (6) passes through the central hole of the sealing packing box (15) and is movably connected to the sealing packing box (15).

7. The flexible continuous sucker rod closed traction operation oil production system according to claim 6 is characterized in that: The upper end of the sealing tube (13) is designed to be disconnected, and an outer sleeve (16) threadedly connected to the upper and lower sealing tubes (13) is provided at the disconnected portion of the sealing tube (13), and the sealing packing box (15) is arranged in the sealing tube (13) located on the upper side of the outer sleeve (16).

8. The flexible continuous sucker rod closed traction operation oil production system according to claim 1 is characterized in that: An inner liner is provided in the oil pipe (22) to extend the service life of the oil pipe and reduce friction between the pump and the oil pipe (22).

9. The flexible continuous sucker rod closed traction operation oil production system according to claim 1, characterized in that: The oil pipe (22) is a continuous pipe.

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