Hydraulic oil extraction high-temperature wellhead sealing device

Abstract

The invention discloses a hydraulic oil extraction high-temperature wellhead sealing device, and relates to the technical field of mechanical oil extraction. Comprising a main body, a screwed plug and an inner core are sequentially arranged in the main body, the inner core is arranged in the main body, the axis of the inner core is parallel to the axis of the main body, the screwed plug is arranged at one end of the main body, a lateral connector is arranged on the outer side of the main body and communicated with the main body, a sealing piece is further arranged in the main body, and the sealing piece is arranged in the main body. A first groove and a second groove are sequentially formed in the end, opposite to the screwed plug, of the body. Through the arrangement of the main body, the inner core, the first sealing ring, the second sealing ring, the pressing pad and the pressing connector, matching of the main body, the inner core, the first sealing ring, the second sealing ring, the pressing pad and the pressing connector is achieved, so that the positions of the main body and the inner core are fixed in the using process, and the phenomenon that the packing box and an oil pumping polished rod are in dynamic sealing is avoided; and the packing is seriously abraded during long-time inclined use and needs to be regularly or irregularly replaced, so that a large amount of manpower and material resources are wasted.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical oil production, and in particular to a high-temperature wellhead sealing device for hydraulic oil production. Background Art

[0002] Oil extraction refers to the act of digging and extracting oil from where it is stored. In the process of oil extraction, oil and gas flow from the reservoir to the bottom of the well and then rise from the bottom of the well to the wellhead.

[0003] At present, when the domestic heavy oil field development adopts the walking beam rod pumping system, especially for thin-layer heavy oil, a repetitive fixed pipe column rotation pumping process is generally adopted. The downhole pipe column adopts a pumping pump with hydraulic feedback force, and the pumping rod is lifted up by a crane and other lifting equipment on the ground to realize the rotation of steam injection and oil production in the fixed pipe column, reduce the workload brought by the operation, and save costs. However, when mining horizontal wells and high-angle wells, the packing box and the pumping rod are dynamic seals. When used at an angle for a long time, the packing is severely worn and needs to be replaced regularly or irregularly, wasting a lot of manpower and material resources. Therefore, a hydraulic oil production high-temperature wellhead sealing device is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the packing box and the oil pumping rod are dynamic seals, the packing is severely worn when used at an angle for a long time, and needs to be replaced regularly or irregularly, wasting a lot of manpower and material resources. The present invention provides a hydraulic oil production high-temperature wellhead sealing device.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A hydraulic oil production high temperature wellhead sealing device, comprising: A main body, wherein a thread plug and an inner core are sequentially arranged inside the main body, wherein the inner core is arranged inside the main body, and the axis of the inner core is parallel to the axis of the main body, wherein the thread plug is arranged at one end of the main body, wherein a lateral connector is arranged outside the main body, wherein the lateral connector is communicated with the main body, and wherein a sealing member is also arranged inside the main body.

[0006] Furthermore, the main body is sequentially provided with a first groove and a second groove relative to the plug end, and the first groove is communicated with the second groove.

[0007] Furthermore, a fixing ring is provided on the outer side of the inner core, the fixing ring is arranged inside the first groove, and a connecting sleeve is provided on the inner core relative to the plug end.

[0008] Furthermore, the sealing member includes a first sealing ring, a pressure pad, a compression joint and a second sealing ring, wherein the first sealing ring and the pressure pad are sequentially arranged inside the second groove, and one end of the first sealing ring is against the wire plug, and the second sealing ring is sleeved on the outside of the inner core, and the second sealing ring is against the fixing ring.

[0009] Furthermore, the compression joint includes a mounting ring and a connecting block, wherein the connecting block is arranged at one end of the mounting ring, the mounting ring is sleeved on the outside of the inner core, the mounting ring abuts against the second sealing ring, and the mounting ring is connected to the main body.

[0010] Furthermore, a through hole is formed on the side wall of the inner core, and the through hole corresponds to the lateral connector.

[0011] The beneficial effects of the present invention are as follows: The present invention realizes the coordination of the main body, the inner core, the first sealing ring, the second sealing ring, the pressure pad and the compression joint through the arrangement of the main body, the inner core, the first sealing ring, the second sealing ring, the pressure pad and the compression joint, thereby fixing the position of the main body and the inner core during use, avoiding the packing box and the oil pumping rod being a dynamic seal, and preventing the packing from being severely worn when used at an angle for a long time, requiring regular or irregular replacement, and wasting a lot of manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a main cross-sectional view of the present invention; Figure 3 This is an enlarged view of the wire plug of the present invention; Figure 4 is a partial cross-sectional view of the inner core of the present invention; Figure 5 It is a partial cross-sectional view of the main body of the present invention; Figure 6 is an enlarged view of the compression joint of the present invention; Figure 7 is an enlarged view of the disassembly tool of the present invention; Figure numerals: 1, thread plug; 2, first sealing ring; 3, pressure pad; 4, clamping joint; 401, mounting ring; 402, connecting block; 5, second sealing ring; 6, main body; 601, first groove; 602, second groove; 603, lateral connector; 7, inner core; 701, fixing ring; 702, connecting sleeve; 8, sleeve; 801, connecting groove. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0015] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0016] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0017] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figures 1 to 7 As shown, a hydraulic oil production high-temperature wellhead sealing device comprises: a main body 6, a plug 1 and an inner core 7 are arranged in sequence inside the main body 6, the inner core 7 is arranged inside the main body 6, and the axis of the inner core 7 is parallel to the axis of the main body 6, the plug 1 is arranged at one end of the main body 6, a lateral connector 603 is arranged on the outside of the main body 6, the lateral connector 603 is connected to the main body 6, and a sealing member is also arranged inside the main body 6. Specifically, when sealing the wellhead, the plug 1 is first connected to the wellhead through the main body 6, so that the wellhead can be sealed during use to avoid oil leakage during oil production. During the sealing process, the inner core 7 is connected to the oil pipe string to provide support for the main body 6 during use, ensuring the stability of the position of the main body 6 relative to the oil pipe string during use. Finally, the produced oil is guided and discharged through the cooperation of the lateral connector 603 and the seal. The thread plug 1 and the first sealing ring 2 are connected by threads, which is convenient for quickly installing and disassembling the thread plug 1 and the main body 6 during the sealing process. The outer side of the lateral connector 603 is provided with a tapered thread, which is convenient for connecting with the ground pipeline during use, so that the ground power fluid and the downhole pipe string can be connected, thereby controlling the inflow and outflow of the power fluid and realizing hydraulic oil production.

[0019] like Figures 1 to 7 As shown, the main body 6 is provided with a first groove 601 and a second groove 602 in sequence relative to the end of the screw plug 1, and the first groove 601 is communicated with the second groove 602. Specifically, the main body 6 is connected to the wellhead by a thread, which is convenient for quickly installing and disassembling the wellhead and the main body 6 during use. The first groove 601 can limit the inner core 7 during use, so that the inner core 7 can be lifted by the main body 6 during use, which is convenient for adding and reducing sucker rod pup sections as needed during use, thereby realizing control of the length of the oil pipe column. The inner wall of the first groove 601 is also provided with an internal thread.

[0020] like Figures 1 to 7 As shown, a fixing ring 701 is provided on the outside of the inner core 7, and the fixing ring 701 is arranged inside the first groove 601. A connecting sleeve 702 is provided on the end of the inner core 7 relative to the screw plug 1. Specifically, the inner core 7 is connected to the oil pipe string by a thread, which is convenient for quickly disassembling and installing the inner core 7 and the oil pipe string during the process of adjusting the length of the oil pipe string. During use, the main body 6 is first connected to the wellhead. After the connection is completed, the inner core 7 is inserted into the main body 6. The inner core 7 inserted into the main body 6 provides support for the inner core 7 through the cooperation of the first groove 601 and the fixing ring 701, and limits the inner core 7 at the same time, so as to prevent the inner core 7 from shaking relative to the main body 6 during use. The outer side of the connecting sleeve 702 is provided with an external thread or a slot to lift the inner core 7.

[0021] like Figures 1 to 7 As shown, the sealing member includes a first sealing ring 2, a pressure pad 3, a clamping joint 4 and a second sealing ring 5. The first sealing ring 2 and the pressure pad 3 are sequentially arranged inside the second groove 602, and one end of the first sealing ring 2 abuts against the wire plug 1. The second sealing ring 5 is sleeved on the outside of the inner core 7, and the second sealing ring 5 abuts against the fixing ring 701. Specifically, the first sealing ring 2 and the second sealing ring 5 are both made of high temperature resistant sealing materials to ensure that the first sealing ring 2 and the second sealing ring 5 can be used stably.

[0022] like Figures 1 to 7As shown, the compression joint 4 includes a mounting ring 401 and a connecting block 402, the connecting block 402 is arranged at one end of the mounting ring 401, the mounting ring 401 is sleeved on the outside of the inner core 7, the mounting ring 401 abuts against the second sealing ring 5, and the mounting ring 401 is connected to the main body 6. Specifically, after the inner core 7 is installed inside the main body 6, the second sealing ring 5 is first sleeved on the outside of the inner core 7, so that the second sealing ring 5 abuts against the fixing ring 701, and then the mounting ring 401 is driven to be inserted into the first groove 601 through the cooperation of the sleeve 8 and the connecting groove 801, so that the mounting ring 4 01 The second sealing ring 5 is installed in cooperation with the first groove 601 to ensure that the position of the inner core 7 is stable while preventing oil from leaking through the gap between the fixing ring 701 and the first groove 601. Then, the pressure pad 3 and the first sealing ring 2 are sequentially sleeved on the outside of the inner core 7, so that the first sealing ring 2 and the pressure pad 3 on the outside of the inner core 7 are abutted against the second groove 602 for limiting position. Finally, the first sealing ring 2 is squeezed by the wire plug 1, so that the first sealing ring 2 cooperates with the pressure pad 3 to seal the gap between the inner core 7 and the second groove 602, so as to prevent oil from leaking from the inner core 7 and the second groove 602 during oil production. The gap between the grooves 602 leaks. The length of the sleeve 8 can meet the installation and removal requirements of the mounting ring 401. When installation is required, first connect the inner core 7 to the downhole oil pipe string, then connect one end of the main body 6 to the wellhead, then tighten the compression joint 4 with the sleeve 8, compress the second sealing ring 5, then sleeve the pressure pad 3 and the first sealing ring 2 on the outside of the inner core 7, then put the inner core 7 into the inner core 7, and finally install the plug 1 on the upper end of the main body 6 so that the plug 1 compresses the first sealing ring 2, and finally connect the ground high-pressure hose to the lateral connector 603. The connection is made to realize the hydraulic oil production power of the steam-throwing well entering or flowing out of the downhole oil pipe, thereby realizing hydraulic oil production. When the downhole oil pipe string is not long enough or too long, the main body 6 and the oil pipe string are first disassembled, and then the main body 6 is lifted to expose the thread of the inner core 7 at the lower end of the main body 6, and finally the oil pipe short pipe at the bottom of the inner core 7 is removed or installed, so as to adjust the length of the oil pipe string. When disassembly is required, the connection between the main body 6 and the wellhead is first removed, and then the connection between the inner core 7 and the oil pipe string is removed, and finally the compression joint 4 is removed with the sleeve 8 to realize the disassembly of the main body 6 and the inner core 7.

[0023] like Figures 1 to 7 As shown, a through hole is provided on the side wall of the inner core 7, and the through hole corresponds to the lateral connector 603. Specifically, during use, the oil inside the inner core 7 is discharged through the cooperation of the through hole and the lateral connector 603.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-temperature wellhead sealing device for hydraulic oil production, characterized in that: include: A main body (6), wherein a thread plug (1) and an inner core (7) are sequentially arranged inside the main body (6), wherein the inner core (7) is arranged inside the main body (6), and the axis of the inner core (7) is parallel to the axis of the main body (6), wherein the thread plug (1) is arranged at one end of the main body (6), wherein a lateral connector (603) is arranged outside the main body (6), wherein the lateral connector (603) is connected to the main body (6), and wherein a sealing member is also arranged inside the main body (6).

2. A hydraulic oil production high temperature wellhead sealing device according to claim 1, characterized in that: The main body (6) is provided with a first groove (601) and a second groove (602) in sequence at an end relative to the screw plug (1), and the first groove (601) is communicated with the second groove (602).

3. A hydraulic oil production high temperature wellhead sealing device according to claim 2, characterized in that: A fixing ring (701) is provided on the outside of the inner core (7), and the fixing ring (701) is arranged inside the first groove (601). A connecting sleeve (702) is provided on the end of the inner core (7) opposite to the screw plug (1).

4. A hydraulic oil production high temperature wellhead sealing device according to claim 1, characterized in that: The sealing member comprises a first sealing ring (2), a pressure pad (3), a compression joint (4) and a second sealing ring (5); the first sealing ring (2) and the pressure pad (3) are sequentially arranged inside the second groove (602), and one end of the first sealing ring (2) abuts against the thread plug (1); the second sealing ring (5) is sleeved on the outside of the inner core (7), and the second sealing ring (5) abuts against the fixing ring (701).

5. A hydraulic oil production high temperature wellhead sealing device according to claim 4, characterized in that: The compression joint (4) comprises a mounting ring (401) and a connecting block (402), wherein the connecting block (402) is arranged at one end of the mounting ring (401), the mounting ring (401) is sleeved on the outside of the inner core (7), the mounting ring (401) abuts against the second sealing ring (5), and the mounting ring (401) is connected to the main body (6).

6. A hydraulic oil production high temperature wellhead sealing device according to claim 3, characterized in that: A through hole is provided on the side wall of the inner core (7), and the through hole corresponds to the lateral connector (603).

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