Thickened oil thermal recovery wellhead anti-blocking device
The heavy oil thermal recovery wellhead anti-clogging device, which combines a rotating scraper with a heating wire, solves the problem of wellhead blockage during heavy oil thermal recovery, achieves efficient scraping and reagent mixing, and improves the efficiency of heavy oil extraction.
Patent Information
- Application Number
- CN202522027999.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2035-09-22
AI Technical Summary
In the current process of heavy oil thermal recovery, the wellhead is prone to blockage due to increased flow resistance caused by solid deposits and "water-in-oil" structures. Existing anti-blockage technologies cannot effectively deal with highly adhesive deposits and the reagents are not mixed evenly, which affects the production efficiency.
The rotating scraper fits tightly against the inner wall of the heavy oil extraction pipe to remove deposits, and the built-in heating wire softens the deposits. At the same time, the liquid guide tube on the back of the scraper extends along the pipe wall to precisely inject demulsifiers and viscosity reducers. The rotating tank, in conjunction with the spiral blades, agitates the mixture to achieve efficient mixing of the agents and heavy oil.
It effectively avoids clogging of heavy oil extraction pipes, improves scraping efficiency and reagent mixing effect, reduces flow resistance, and increases extraction efficiency.
Smart Images
Figure CN223510902U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heavy oil thermal recovery technology, and in particular to a heavy oil thermal recovery wellhead anti-clogging device. Background Technology
[0002] During the thermal recovery of heavy oil, high-viscosity heavy oil is prone to forming solid deposits (such as asphaltene and waxes) due to temperature fluctuations. Simultaneously, the "water-in-oil" structure formed by the emulsification of steam condensate and heavy oil further increases flow resistance. Existing anti-clogging technologies have significant limitations. For example, fixed scrapers cannot cover the entire circumference of the pipe wall and cannot handle highly adhesive deposits. Furthermore, traditional chemical agent injection points are concentrated at a single point at the wellhead, leading to uneven mixing of the agent and heavy oil, thus limiting the viscosity-reducing effect. These problems easily lead to frequent wellhead blockages, requiring production shutdowns for unclogging, severely impacting production efficiency.
[0003] Therefore, it is necessary to provide a new anti-clogging device for heavy oil thermal recovery wellheads to solve the above-mentioned technical problems. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a device for preventing blockage at the wellhead of heavy oil thermal recovery.
[0005] The heavy oil thermal recovery wellhead anti-blocking device provided by this utility model includes a heavy oil extraction pipe, a guide pipe is installed on the side of the heavy oil extraction pipe near the top, and a rotating rod is rotatably connected inside the heavy oil extraction pipe, and a spiral blade is fixedly sleeved on the rotating rod.
[0006] The heavy oil extraction pipe is equipped with a liquid delivery tank, and the liquid delivery tank is equipped with multiple sets of annularly distributed scrapers. The scrapers have built-in heating wires, and the back of the scrapers is fixedly installed with a liquid guide pipe that communicates with the liquid delivery tank. The liquid guide pipe has multiple evenly distributed injection ports.
[0007] Preferably, the delivery tank includes a rotating tank body and a fixed tank cover. The rotating tank body is fixedly sleeved on the rotating rod and located at the top of the heavy oil extraction pipe. The rotating tank body is equipped with a rotatably connected fixed tank cover, which extends out of the top of the heavy oil extraction pipe and is fixedly connected to the heavy oil extraction pipe.
[0008] Preferably, a connecting pipe is fixedly installed at the top of the liquid guide pipe, and the connecting pipe is fixedly connected to the drain port at the bottom of the rotating tank.
[0009] Preferably, the fixed tank cover is equipped with a liquid inlet port.
[0010] Preferably, a drive motor is fixedly mounted on the top of the heavy oil extraction pipe via a frame, and the output end of the drive motor is fixedly connected to the connecting end of the rotating rod.
[0011] Preferably, a connecting flange is fixedly installed at the bottom of the heavy oil extraction pipe.
[0012] Preferably, the scraper abuts against the inner wall of the heavy oil extraction pipe.
[0013] Compared with related technologies, the heavy oil thermal recovery wellhead anti-clogging device provided by this utility model has the following beneficial effects:
[0014] In this invention, the rotating scraper fits tightly against the inner wall of the heavy oil extraction pipe, scraping away deposits circumferentially to prevent them from clumping together. The scraper has a built-in heating wire to achieve localized high temperatures, directly softening the deposits and improving scraping efficiency. The liquid guide tube extends along the back of the scraper, and its injection port allows the demulsifier / viscosity reducer to be precisely sprayed into the heavy oil. The rotating tank rotates with the rotating rod, and in conjunction with the stirring of the spiral blades, achieves efficient mixing of the agent and the heavy oil. Attached Figure Description
[0015] Figure 1 A schematic diagram of a preferred embodiment of the heavy oil thermal recovery wellhead anti-clogging device provided by this utility model;
[0016] Figure 2 for Figure 1 A schematic cross-sectional view of the heavy oil extraction pipe shown.
[0017] Figure 3 for Figure 2 A magnified structural diagram of point A is shown below;
[0018] Figure 4 for Figure 2 The diagram shows the structure of the scraper.
[0019] The following are the labels in the diagram: 1. Heavy oil extraction pipe; 11. Connecting flange; 2. Guide pipe; 3. Rotating rod; 31. Spiral blade; 4. Drive motor; 5. Liquid delivery tank; 51. Rotating tank body; 52. Fixed tank cover; 53. Liquid inlet port; 6. Scraper; 61. Guide pipe; 61a. Injection port; 611. Connecting pipe. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0021] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.
[0022] Please see Figures 1 to 4This utility model provides a heavy oil thermal recovery wellhead anti-blocking device, which includes a heavy oil extraction pipe 1, a spiral blade 31, a liquid delivery tank 5, and a scraper 6.
[0023] In the embodiments of this utility model, please refer to Figures 1 to 4 A guide pipe 2 is installed on the side of the heavy oil extraction pipe 1 near the top, and a rotating rod 3 is installed inside the heavy oil extraction pipe 1. A spiral blade 31 is fixedly sleeved on the rotating rod 3. A drive motor 4 is fixedly installed on the top of the heavy oil extraction pipe 1 through the frame, and the output end of the drive motor 4 is fixedly connected to the connecting end of the rotating rod 3. A connecting flange 11 is fixedly installed at the bottom of the heavy oil extraction pipe 1.
[0024] It should be noted that: the heavy oil extraction pipe 1 is connected to the oil well discharge pipe through the connecting flange 11, while the guide pipe 2 is connected to the pump. When pumping oil, the drive motor 4 is turned on to drive the rotating rod 3 to rotate. Therefore, the spiral blade 31 plays the role of transporting heavy oil and reducing the risk of wellhead blockage.
[0025] In the embodiments of this utility model, please refer to Figures 1 to 4 A liquid delivery tank 5 is installed on the heavy oil extraction pipe 1, and multiple sets of annularly distributed scrapers 6 are installed on the liquid delivery tank 5. The scrapers 6 have heating wires inside, and the scrapers 6 abut against the inner wall of the heavy oil extraction pipe 1. A liquid guide pipe 61 communicating with the liquid delivery tank 5 is fixedly installed on the back of the scraper 6. Multiple evenly distributed injection ports 61a are opened on the liquid guide pipe 61.
[0026] The liquid delivery tank 5 includes a rotating tank body 51 and a fixed tank cover 52. The rotating tank body 51 is fixedly sleeved on the rotating rod 3 and located at the top of the heavy oil extraction pipe 1. The fixed tank cover 52 is rotatably connected to the rotating tank body 51 and extends out of the top of the heavy oil extraction pipe 1 and is fixedly connected to the heavy oil extraction pipe 1. A connecting pipe 611 is fixedly installed at the top of the liquid guide pipe 61 and is fixedly connected to the drain port at the bottom of the rotating tank body 51. An inlet port 53 is installed on the fixed tank cover 52.
[0027] It should be noted that: since the rotating tank 51 is fixedly sleeved on the rotating rod 3, and the fixed tank cover 52 extends out of the top of the heavy oil extraction pipe 1 and is fixedly connected to the heavy oil extraction pipe 1, and the rotating tank 51 and the fixed tank cover 52 are rotatably connected, the fixed tank cover 52 drives each scraper 6 to rotate synchronously with the rotating rod 3. Therefore, the scraper 6 can scrape off the sticky substances attached to the heavy oil extraction pipe 1, avoiding the risk of "clumping together" and blockage of the heavy oil extraction pipe 1 due to excessive accumulation of substances on the pipe wall. Furthermore, supplying power to the scraper 6 will cause the heating wire to heat up, thereby heating the heavy oil inside the heavy oil extraction pipe 1 to alleviate the viscous state of the heavy oil.
[0028] The inlet port 53 is connected to the chemical storage tank through a conduit, so that the chemical storage tank discharges the agent into the rotating tank 51, and the rotating tank 51 discharges it into each liquid guide pipe 61, and finally discharges it into the heavy oil extraction pipe 1 through the injection port 61a so that it mixes with the heavy oil.
[0029] Among them, chemical agents are rotated as needed, such as demulsifiers, viscosity reducers, and asphaltene dispersants. Taking demulsifiers as an example, adding demulsifiers can reduce the interfacial tension between oil and water, improve fluidity, prevent emulsion blockage, and reduce flow resistance.
[0030] In this application, the rotating scraper 6 is in close contact with the inner wall of the heavy oil extraction pipe 1, scraping away the deposits in a circumferential manner to avoid "clumping together". The built-in heating wire of the scraper 6 achieves local high temperature, directly softening the deposits and improving scraping efficiency. The liquid guide pipe 61 extends along the back of the scraper 6, and its injection port 61a allows the demulsifier / viscosity reducer to be accurately sprayed into the heavy oil. The rotating tank 51 rotates with the rotating rod 3, and with the stirring of the spiral blade 31, the agent and heavy oil are mixed efficiently.
[0031] In this embodiment, in order to increase the drainage force of the injection port 61a, a booster pump can be installed inside the rotating tank 51.
[0032] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.
[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A device for preventing blockage at the wellhead of heavy oil thermal recovery, characterized in that, Includes a heavy oil extraction pipe (1), a guide pipe (2) is installed on the side of the heavy oil extraction pipe (1) near the top, and a rotating rod (3) is installed inside the heavy oil extraction pipe (1) and a spiral blade (31) is fixedly sleeved on the rotating rod (3). The heavy oil extraction pipe (1) is equipped with a liquid delivery tank (5), and the liquid delivery tank (5) is equipped with multiple sets of annularly distributed scrapers (6). The scrapers (6) are equipped with heating wires, and the back of the scrapers (6) is fixedly equipped with a liquid guide pipe (61) that communicates with the liquid delivery tank (5). The liquid guide pipe (61) is provided with multiple evenly distributed injection ports (61a).
2. The heavy oil thermal recovery wellhead anti-clogging device according to claim 1, characterized in that, The liquid delivery tank (5) includes a rotating tank body (51) and a fixed tank cover (52). The rotating tank body (51) is fixedly sleeved on the rotating rod (3) and located at the top of the heavy oil extraction pipe (1). The rotating tank body (51) is equipped with a rotatably connected fixed tank cover (52), and the fixed tank cover (52) extends out of the top of the heavy oil extraction pipe (1) and is fixedly connected to the heavy oil extraction pipe (1).
3. The heavy oil thermal recovery wellhead anti-clogging device according to claim 2, characterized in that, The top of the liquid guide pipe (61) is fixedly installed with a connecting pipe (611), and the connecting pipe (611) is fixedly connected to the drain port at the bottom of the rotating tank (51).
4. The anti-clogging device for heavy oil thermal recovery wellheads according to claim 2, characterized in that, The fixed tank cover (52) is equipped with a liquid inlet port (53).
5. The anti-clogging device for heavy oil thermal recovery wellheads according to claim 1, characterized in that, The top of the heavy oil extraction pipe (1) is fixedly mounted with a drive motor (4) via a frame, and the output end of the drive motor (4) is fixedly connected to the connecting end of the rotating rod (3).
6. The anti-clogging device for heavy oil thermal recovery wellheads according to claim 1, characterized in that, A connecting flange (11) is fixedly installed at the bottom of the heavy oil extraction pipe (1).
7. The anti-clogging device for heavy oil thermal recovery wellheads according to claim 1, characterized in that, The scraper (6) abuts against the inner wall of the heavy oil extraction pipe (1).