Underground injection-production device for oil sand exploitation

Abstract

The utility model relates to the technical field of oil sand exploitation, in particular to an oil sand exploitation underground injection-production device which comprises an exploitation pipe and an external connecting pipe connected outside the exploitation pipe in a threaded mode, an inserting ring is fixedly arranged at the inserting end of the exploitation pipe, and an annular piston is arranged at the free end of the inserting ring. The external connecting pipe comprises a threaded connecting section, a transition section and a butt joint section, an inserting cavity is formed in the transition section, the inserting ring can be inserted into the inserting cavity, the inserting cavity can be in sealing sliding fit with the annular piston, a pressurizing air bag ring is arranged in the inserting ring, and the bag wall, away from an opening of the inserting cavity, of the pressurizing air bag ring is fixedly connected with the inner wall of the inserting cavity; an annular groove is formed in the connecting position of the threaded connecting section and the transition section, an annular sealing air bag ring is installed in the annular groove, the end, close to the interior of the external connecting pipe, of the annular sealing air bag ring is not fixed, and the annular sealing air bag ring communicates with the pressurizing air bag ring. According to the utility model, the problem that oil spills easily at the joint when the mining pipe is in threaded connection with the external connecting pipe can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil sand mining, in particular to an underground injection and mining device for oil sand mining. Background Art

[0002] In the development history of contemporary oil extraction technology, traditional drilling and extraction methods still occupy an important position. The core of this method is to use the drill pipe to directly penetrate deep into the formation, and use the natural pressure of the oil reservoir in the formation or artificial pressurization technology to drive the crude oil through the drill pipe and transport it upward to the ground.

[0003] In oil sand mining, the mining pipe and the external connecting pipe are usually connected by thread. The threaded connection uses the tight meshing of internal and external threads to achieve sealing and fixation, ensuring that the fluid (mixture containing oil sand) can be smoothly transmitted from the well to the ground processing facilities during the mining process. This connection method is popular because of its convenient installation and relatively simple maintenance, but this method still has the following technical problems in actual application:

[0004] 1. Long-term exposure to high temperature and high pressure will accelerate the degradation of the physical properties of the threaded connection, and easily cause oil spills at the connection between the production pipe and the external connecting pipe.

[0005] 2. The tiny gaps at the threaded connection become gathering points for solid particles. Especially when the flow rate in the pipeline decreases, the particles are more likely to settle, causing the connection between the production pipe and the external connecting pipe to gradually become blocked. Utility Model Content

[0006] The utility model aims to provide an injection and production device for oil sand mining wells, so as to solve the problem that oil is easily overflowed at the connection point when a mining pipe and an external connecting pipe are connected by threads.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An oil sand mining downhole injection and production device comprises a mining pipe and an external connecting pipe threadedly connected to the outside of the mining pipe, an insertion ring is fixedly provided at the insertion end of the mining pipe, an annular piston is provided at the free end of the insertion ring, the external connecting pipe comprises a threaded connection section, a transition section and a docking section, the threaded connection section can be threadedly connected to the outside of the mining pipe, an insertion cavity is provided on the transition section, the insertion cavity can be inserted by the insertion ring and can be sealed and slidably matched with the annular piston, a booster airbag ring is provided in the insertion ring, a bag wall of the booster airbag ring away from the opening of the insertion cavity is fixedly connected to the inner wall of the insertion cavity, an annular groove is provided at the connection between the threaded connection section and the transition section, an annular sealing airbag ring is installed in the annular groove, one end of the annular sealing airbag ring close to the inside of the external connecting pipe is not fixed, the annular sealing airbag ring is connected to the booster airbag ring, and the annular piston can squeeze the booster airbag ring when the insertion ring is inserted into the insertion cavity.

[0009] Preferably, as an improvement, the threaded connection section, the transition section and the docking section are integrally formed, and the inner diameter of the docking section is the same as the inner diameter of the production pipe.

[0010] Preferably, as an improvement, a plurality of spherical cavities are provided on the inner wall of the mining pipe and the inner wall of the external connecting pipe, and steel balls are rollingly connected in the spherical cavities.

[0011] Preferably, as an improvement, one third of the sphere of the steel ball extends out of the spherical cavity.

[0012] Preferably, as an improvement, the spherical cavities are evenly distributed in an annular manner along the inner walls of the production pipe and the external connecting pipe.

[0013] Preferably, as an improvement, a flow guide cavity is provided between the insertion cavity and the annular groove, an air guide tube is embedded in the flow guide cavity, and two ends of the air guide tube are respectively interconnected with the annular sealing airbag ring and the booster airbag ring.

[0014] The principles and beneficial effects of this scheme are:

[0015] 1. This solution sets an insertion cavity on the external connecting pipe to cooperate with the insertion ring on the production pipe, and sets an annular piston on the insertion ring, and sets a booster airbag ring in the insertion cavity. As the production pipe and the external connecting pipe are screwed together, the annular piston on the insertion ring abuts against the booster airbag ring, and the booster airbag ring compresses and allows the compressed air to flow into the annular sealing airbag ring through the air guide tube, so that the annular sealing airbag ring expands. The expanded annular sealing airbag ring abuts against the outer wall of the insertion end of the production pipe, thereby sealing the front end of the threaded connection part of the production pipe and the external connecting pipe to prevent the fluid from entering the threaded connection section, increasing the connection sealing of the production pipe and the external connecting pipe, and effectively solving the problem of leakage that is easy to occur during the production process. At the same time, it blocks the fluid from entering the thread gap of the threaded connection section, and also effectively avoids the aggregation of solid particles, reducing or even avoiding the blockage of oil sands at the connection.

[0016] 2. The external connecting pipe adopts a structure of a threaded connection section, a transition section and a docking section, and the inner diameter of the docking section is the same as the inner diameter of the production pipe, and the insertion cavity is opened on the transition section. When the insertion ring is fully inserted into the insertion cavity, the insertion end of the production pipe abuts against the docking section of the external connecting pipe, and the inner wall of the production pipe is smoothly connected to the inner wall of the docking section, which can further improve the sealing of the connection.

[0017] 3. In addition, after the insertion end of the production pipe is abutted against the docking section, if the fluid wants to overflow, it can only enter the insertion cavity from the abutment point of the production pipe and the docking section, and then enter the threaded connection section from the annular groove. However, this solution arranges an annular piston and a booster airbag ring in the insertion cavity, which can be used as a primary seal, and the annular sealing airbag ring in the annular groove serves as a secondary seal. The two-stage sealing method further improves the sealing of the connection.

[0018] 4. The steel balls are rotated with the flow of oil, so the pipe wall at this location reduces the risk of oil stains adhering to the connection between the production pipe and the external connection pipe, thereby causing the accumulation of oil stains and blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0020] Figure 2 It is a schematic diagram of the structure of the external connecting pipe in the embodiment of the utility model.

[0021] Figure 3 It is a schematic diagram of the structure of the mining pipe in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following is further described in detail through specific implementation methods:

[0023] The figure marks in the drawings of the specification include: mining pipe 1, docking external thread 11, insertion ring 12, annular piston 13, external connecting pipe 2, docking internal thread 21, insertion cavity 22, pressurized airbag ring 23, air guide tube 24, annular sealing airbag ring 25, threaded connection section 26, transition section 27, docking section 28, spherical cavity 3, and steel ball 31.

[0024] Example:

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, an oil sand mining downhole injection and production device includes a mining pipe 1 and an external connecting pipe 2, which are threadedly connected. Specifically: a docking external thread 11 is provided on the outer wall of the inserted end of the mining pipe 1, and the external connecting pipe 2 includes an integrally formed threaded connection section 26, a transition section 27 and a docking section 28, the inner diameter of the docking section 28 is the same as the inner diameter of the mining pipe 1, and a docking internal thread 21 is provided on the inner wall of the threaded connection section 26. The mining pipe 1 and the external connecting pipe 2 are threadedly connected by the docking external thread 11 and the docking internal thread 21, that is, the threaded connection section 26 of the external connecting pipe 2 is threadedly connected to the outside of the mining pipe 1.

[0026] The insertion end of the mining pipe 1 is integrally formed with an insertion ring 12, and the free end of the insertion ring 12 is integrally formed with an annular piston 13. An insertion cavity 22 is provided on the transition section 27 of the external connection section, and the insertion cavity 22 can be inserted into the insertion ring 12 and can be sealed and slidably matched with the annular piston 13. A booster airbag ring 23 is provided in the insertion ring 12, and the wall of the booster airbag ring 23 away from the opening of the insertion cavity 22 is fixedly connected to the inner wall of the insertion cavity 22, and an annular groove is provided at the connection between the threaded connection section 26 and the transition section 27, and an annular sealing airbag ring 25 is installed in the annular groove, and the end of the annular sealing airbag ring 25 close to the inside of the external connection pipe 2 is not fixed, and the end of the annular sealing airbag ring 25 away from the external connection pipe 2 is fixedly connected to the inner wall of the annular groove. A flow guiding cavity is provided between the insertion cavity 22 and the annular groove, and an air guiding tube 24 is embedded in the flow guiding cavity. Two ends of the air guiding tube 24 are respectively communicated with the annular sealing air bag ring 25 and the boosting air bag ring 23 .

[0027] A plurality of annularly evenly distributed spherical cavities 3 are provided on the inner wall of the mining pipe 1 and the inner wall of the external connecting pipe 2 . Steel balls 31 are rollingly connected in the spherical cavities 3 , and one third of the sphere of the steel balls 31 extends out of the spherical cavities 3 .

[0028] The working principle of the oil sand mining downhole injection and production device provided by the utility model is as follows:

[0029] When the mining pipe 1 is docked with the external connecting pipe 2, the insertion ring 12 and the annular piston 13 on the mining pipe 1 are inserted into the insertion cavity 22 in the external connecting pipe 2. As the threads of the mining pipe 1 and the external connecting pipe 2 are tightened, the annular piston 13 on the insertion ring 12 abuts against the booster airbag ring 23. Therefore, the booster airbag ring 23 compresses and allows the compressed air to flow into the annular sealing airbag ring 25 through the air guide tube 24, causing the annular sealing airbag ring 25 to expand. The expanded annular sealing airbag ring 25 extends outward from the annular groove and abuts against the outer wall of the mining pipe 1 at the front end of the docking external thread 11, thereby achieving the sealing of the docking external thread 11 and the docking internal thread 21, thereby increasing the connection sealing performance of the mining pipe 1 and the external connecting pipe 2, and effectively solving the problem of leakage that is prone to occur during the mining process.

[0030] When the oil flows from the connection between the production pipe 1 and the external connection pipe 2, the oil can impact the steel ball 31, thereby causing the steel ball 31 to rotate. Therefore, the pipe wall at this location has a reduced risk of oil stains adhering to the connection between the production pipe 1 and the external connection pipe 2, thereby causing the accumulation of oil stains and blockage there.

[0031] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An oil sand mining downhole injection and production device, comprising a production pipe and an external connecting pipe threadedly connected to the outside of the production pipe, characterized in that: The insertion end of the mining pipe is fixedly provided with an insertion ring, and the free end of the insertion ring is provided with an annular piston. The external connecting pipe includes a threaded connection section, a transition section and a docking section. The threaded connection section can be threadedly connected to the outside of the mining pipe, and the transition section is provided with an insertion cavity, which can be inserted by the insertion ring and can slide and seal with the annular piston. A booster airbag ring is provided in the insertion ring, and the wall of the booster airbag ring away from the opening of the insertion cavity is fixedly connected to the inner wall of the insertion cavity. An annular groove is provided at the connection between the threaded connection section and the transition section, and an annular sealing airbag ring is installed in the annular groove. The end of the annular sealing airbag ring close to the inside of the external connecting pipe is not fixed, and the annular sealing airbag ring is connected to the booster airbag ring. When the insertion ring is inserted into the insertion cavity, the annular piston can squeeze the booster airbag ring.

2. The downhole injection and production device for oil sand mining according to claim 1, characterized in that: The threaded connection section, the transition section and the butt joint section are integrally formed, and the inner diameter of the butt joint section is the same as the inner diameter of the production pipe.

3. The downhole injection and production device for oil sand mining according to claim 2, characterized in that: A plurality of spherical cavities are provided on the inner wall of the mining pipe and the inner wall of the external connecting pipe, and steel balls are connected and rolled in the spherical cavities.

4. The downhole injection and production device for oil sand mining according to claim 3, characterized in that: One third of the sphere of the steel ball extends out of the spherical cavity.

5. The downhole injection and production device for oil sand mining according to claim 4, characterized in that: The spherical cavities are evenly distributed in an annular manner along the inner walls of the production pipe and the external connecting pipe.

6. The downhole injection and production device for oil sand mining according to claim 5, characterized in that: A flow guide cavity is arranged between the insertion cavity and the annular groove, an air guide tube is embedded in the flow guide cavity, and two ends of the air guide tube are respectively communicated with the annular sealing airbag ring and the boosting airbag ring.

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