Underground coiled tubing heating assembly for oil extraction

Abstract

The invention discloses an underground continuous oil pipe heating assembly for oil extraction, and relates to the technical field of oil pipe steam heating. An inseparable first hose body is connected to the outer side of a continuous oil pipe body side by side, and a separable second hose body is connected to the tail end of the first hose body; the tail end of the second hose body floats upwards through the columnar air bag, so that after the device is lowered to an underground oil layer, the tail end of the first channel can float upwards to the position above the crude oil level in the underground oil layer, and high-temperature steam can be conveyed from bottom to top through the first channel in cooperation with the operation that a large amount of high-pressure and high-temperature steam is injected into the underground oil layer during SAGD oil extraction; the continuous oil pipe body is heated from bottom to top by means of high-temperature steam, a large number of evenly-distributed electric heating assemblies do not need to be used, installation and use are convenient and fast, and the heating cost during continuous oil pipe oil extraction can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe steam heating, and in particular to a downhole continuous oil pipe heating assembly for oil production. Background Art

[0002] In the field of oil extraction, continuous tubing oil production technology has been widely used. When extracting heavy oil or high-viscosity oil, in order to reduce the viscosity of crude oil and improve its fluidity, so as to facilitate the smooth transportation of crude oil from the formation oil layer to the ground, it is particularly important to heat the downhole continuous tubing.

[0003] In the prior art, heating components used for downhole continuous oil pipes generally adopt an electric heating mode. The electric heating components are arranged on the continuous oil pipe or directly in the oil well. After power is turned on, the heating operation of the crude oil transported in the continuous oil pipe is realized. In order to ensure that the entire oil pipe and the path through which the crude oil flows in the well can be effectively heated, the electric heating components are usually evenly distributed. This leads to a huge amount of electric heating components used during long-distance oil production and transportation, which greatly increases the purchase, installation, and subsequent operation and maintenance costs of the heating equipment, resulting in an increase in oil production costs. In addition, the evenly distributed heating components are inconvenient to install in a narrow oil well. If they are directly installed on the continuous oil pipe, it is easy to interfere with the lowering of the continuous oil pipe, affecting its installation and convenience.

[0004] Therefore, a downhole coiled tubing heating assembly for oil production is proposed to solve some problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that a large number of uniformly distributed electric heating components are used when heating the coiled tubing for oil production, resulting in high heating costs for the coiled tubing and inconvenient installation and use, and to propose a downhole coiled tubing heating component for oil production.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions: A downhole continuous oil pipe heating assembly for oil production comprises a continuous oil pipe body and a steam injection pipe arranged side by side with the continuous oil pipe body, the ends of the continuous oil pipe body are inserted in the lower space in the underground oil layer, the end of the steam injection pipe is inserted in the upper space in the underground oil layer, the upper end of the steam injection pipe is externally connected to a high-temperature steam supply device, a first hose body arranged side by side with the continuous oil pipe body is installed on the outer end wall, and the first hose body is firmly connected to the continuous oil pipe body, the end of the first hose body is connected to the second hose body, and the end of the second hose body is installed with a columnar airbag, the columnar airbag is vertically suspended on the crude oil liquid surface in the underground oil layer, a first channel is commonly opened in the first hose body and the second hose body, and the end of the first channel extends to the outside of the columnar airbag and is on the crude oil liquid surface in the underground oil layer, and an electric control valve is fixedly installed at the end of the first channel.

[0007] Preferably, a plurality of equally spaced magnetic conductive plates are orderly mounted at the end of the coiled tubing body, and electromagnets corresponding to the plurality of magnetic conductive plates are orderly mounted on the second hose body, and the electromagnets are magnetically attracted to the corresponding magnetic conductive plates when energized.

[0008] Preferably, a groove matching the outer size of the coiled tubing body is provided on one side of the first hose body close to the coiled tubing body, a plurality of equally spaced clamping rings are sequentially engaged at the end of the coiled tubing body, and a plurality of magnetic conductive plates are fixed on the plurality of clamping rings one by one.

[0009] Preferably, an electric heating tube is installed at the end of the second flexible tube body.

[0010] Preferably, a second passage is provided in both the first hose body and the second hose body, and the second passage is communicated with the interior of the cylindrical airbag.

[0011] Preferably, the electric heating tube and the columnar airbag are arranged side by side, an L-shaped airbag is fixedly connected between the end of the columnar airbag and the end of the electric heating tube, and the L-shaped airbag is connected to the second channel. After the L-shaped airbag is inflated, a stable L-shaped structure is formed.

[0012] Preferably, a spring sheet is fixedly installed in the L-shaped airbag, and the spring sheet presents a U-shaped structure when not subjected to external force.

[0013] Preferably, a solenoid valve is installed at the connection point between the cylindrical airbag and the second channel, and a solenoid valve is also installed at the connection point between the second channel and the L-shaped airbag.

[0014] Preferably, a third channel is provided in both the first hose body and the second hose body, and the third channel is arranged side by side with the first channel, the end of the third channel points to the electric heating tube, the steam flow direction in the third channel is opposite to the steam flow direction in the first channel, and an electric control valve is also fixedly installed at the end of the third channel.

[0015] Preferably, the upper ends of the first channel and the third channel are connected with a connecting piece, and the connecting piece includes a carrier, a first through pipe is opened inside one end of the carrier, and the first through pipe is externally connected to a high-temperature steam supply device, a second through pipe connected to the upper end of the third channel is opened at the other end of the carrier, a cavity connected between the first through pipe and the second through pipe is opened in the carrier, and a nozzle connected to the first through pipe is fixedly installed in the cavity, and the nozzle points to the second through pipe, a third through pipe connected to the inner end wall of the cavity is opened in the carrier, and the third through pipe is connected to the upper end of the first channel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the inseparable first hose body is connected side by side to the outside of the coiled tubing body, the detachable second hose body is connected to the end of the first hose body, and the end of the second hose body is floated by means of a columnar air bag, so that after the device is lowered into the underground oil layer, the ends of the first channels arranged in the first hose body and the second hose body can float to above the crude oil liquid level in the underground oil layer, and in conjunction with the operation of injecting a large amount of high-pressure and high-temperature steam into the underground oil layer during SAGD oil production, the high-temperature steam can be transported from bottom to top through the first channel, which is consistent with the path of crude oil being transported upward through the coiled tubing body. The coiled tubing body is heated from bottom to top by means of high-temperature steam, without the need to use a large number of evenly distributed electric heating components, and the installation and use are convenient, which can effectively reduce the heating cost during coiled tubing oil production; 2. In the present invention, a plurality of uniformly distributed magnetic conductive plates are sequentially installed at the end of the coiled tubing body, and electromagnets corresponding to the plurality of magnetic conductive plates are sequentially installed on the second hose body. By means of the magnetic attraction between the electromagnets and the corresponding magnetic conductive plates after they are powered on, the connection control between the second hose body and the end of the coiled tubing body can be realized, and the flexible control of the separation and connection between the second hose body and the end of the coiled tubing body can be realized, which can improve the convenience and stability of the device when it is lowered or recovered along the oil well to a certain extent; 3. In the present invention, by providing a slot on the first hose body, the first hose body and the coiled tubing body can be firmly connected by means of the engagement of the slot and the coiled tubing body. At the same time, by engaging a clamping ring fixed to a plurality of magnetic conductive plates in a one-to-one correspondence with the end of the coiled tubing body, the flexibility and convenience of the device during assembly and disassembly can be effectively improved. By cooperating with the support and expansion piece to open the slot, the device can be assembled and used synchronously during the process of lowering the coiled tubing body along the oil production well, which improves the flexibility of the device to a certain extent. 4. In the present invention, by installing the electric heating pipe at the end of the second hose body, the high-temperature steam filled in the underground oil layer can be heated again to ensure the high-temperature stability of the steam. At the same time, by connecting the L-shaped airbag between the end of the electric heating pipe and the columnar airbag, and cooperating with the elastic reset of the spring piece fixed in the L-shaped airbag, the staff can control the posture of the electric heating pipe in the underground oil layer by charging and discharging air. After the electric heating pipe is flattened, it is horizontally above the crude oil liquid surface, which can effectively increase the contact area between the electric heating pipe and the steam, which is conducive to improving the effect of the electric heating pipe on the secondary heating of the steam. After the electric heating pipe is stored, it is between the columnar airbag and the coiled oil pipe body, which can protect the electric heating pipe and ensure the safety of the device during lowering and recovery. 5. In the present invention, by opening a third channel arranged side by side with the first channel in the first hose body and the second hose body, and transporting high-temperature steam from top to bottom in the third channel, combined with the high-temperature steam transportation from bottom to top in the first channel, the uniform stability of the continuous oil pipe body being heated by steam can be effectively improved. At the same time, by connecting the connecting piece to the upper ends of the first channel and the third channel, the steam transported to the upper side in the first channel can be circulated and transported through the third channel, and finally heated again by the electric heating pipe and a large amount of high-temperature and high-pressure steam in the underground oil layer, so as to realize the recycling of steam, which is conducive to the saving and recycling of steam energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the present invention when it is in operation; Figure 2 For the present invention Figure 1 Sectional view at AA in the middle; Figure 3 A three-dimensional diagram of the present invention when in operation; Figure 4 For the present invention Figure 3 Front view of the structure in section; Figure 5 It is a three-dimensional diagram of the second hose body and the end of the coiled tubing body being separated when the present invention is in operation; Figure 6 This is a three-dimensional diagram of the present invention when the clamping slot is opened and clamped on the outside of the coiled tubing body by using the expansion piece; Figure 7 This is a disassembled view of the coiled tubing body, the clamping groove and the support member of the present invention; Figure 8 For the present invention Figure 6 Front view of the structure in section; Fig. 9It is a three-dimensional diagram of the present invention when it is placed vertically downward; Fig.10 It is a stereoscopic diagram of the invention being lowered vertically into the underground oil layer and then bent to a horizontal state; Fig.11 It is a three-dimensional diagram of the second flexible hose body and the end of the coiled tubing body of the present invention when they are not separated; Fig.12 For the present invention Fig.11 Front view of the L-shaped airbag.

[0018] Serial number in the picture: 1. Coiled tubing body; 101. Steam injection pipe; 2. first flexible tube body; 201. second flexible tube body; 202. cylindrical airbag; 203. first channel; 3. Magnetic plate; 301. Electromagnet; 4. Card slot; 401. Card ring; 5. Electric heating tube; 6. Second channel; 601. L-shaped airbag; 602. Shrapnel; 7. The third channel; 8. Connector; 801. Carrier; 802. First through-tube; 803. Second through-tube; 804. Cavity; 805. Nozzle; 806. Third through-tube; 9. Supporting member; 901. Ring frame; 902. First supporting block; 903. Second supporting block; 904. Groove; 905. Spray hole. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Embodiment: This embodiment provides a downhole coiled tubing heating assembly for oil production, see Figure 1 - Fig.12Specifically, it includes a coiled tubing body 1, and a steam injection pipe 101 arranged side by side with the coiled tubing body 1, the ends of the coiled tubing body 1 are inserted in the lower space in the underground oil layer, the end of the steam injection pipe 101 is inserted in the upper space in the underground oil layer, the upper end of the steam injection pipe 101 is externally connected to a high-temperature steam supply device, a first hose body 2 arranged side by side is installed on the outer end wall of the coiled tubing body 1, and the first hose body 2 is firmly connected to the coiled tubing body 1, the end of the first hose body 2 is connected to the second hose body 201, and the end of the second hose body 201 is installed with a columnar airbag 202, the columnar airbag 202 is vertically suspended on the crude oil liquid surface in the underground oil layer, the first hose body 2 and the second hose body 201 are jointly provided with a first channel 203, and the end of the first channel 203 extends to the outside of the columnar airbag 202 and is on the crude oil liquid surface in the underground oil layer, and the end of the first channel 203 is fixedly installed with an electric control valve.

[0021] When using SAGD technology to exploit underground oil layers, workers can use the device to steam heat the continuous tubing body 1 to ensure the temperature of the crude oil transported in the continuous tubing body 1, thereby ensuring the continuous tubing body 1 is stable and efficient in transporting crude oil. During the oil production process, the continuous tubing body 1 and the first flexible hose body 2 connected to it are lowered into the lower space of the underground oil layer through the oil production well, and then the columnar airbag 202 floats on the liquid surface of the crude oil in the underground oil layer under its own buoyancy. With the help of the columnar airbag 202 suspended on the liquid surface of the crude oil, The end of the first channel 203 is exposed above the liquid surface of the crude oil in the underground oil layer. By installing the electric control valve at the end of the first channel 203, the end of the first channel 203 is in a closed state during the lowering process, which can prevent sand or crude oil from entering the first channel 203 during the lowering and installation of the device, and prevent the first channel 203 from being blocked during the installation process. When the first channel 203 rises to above the liquid surface of the crude oil in the underground oil layer due to the buoyancy of the columnar airbag 202, the electric control valve installed at the end of the first channel 203 opens to ensure the connectivity of the first channel 203.

[0022] The steam injection pipe 101 is lowered into the upper space of the underground oil layer through the steam injection well. During operation, the high-temperature steam supply device connected to the upper end of the steam injection pipe 101 is started, and high-temperature and high-pressure steam is continuously provided to the underground oil layer through the steam injection pipe 101. The high-temperature steam enters the underground oil layer to heat the crude oil in the underground oil layer, and the injection of high-pressure steam allows the crude oil in the underground oil layer to enter through the bottom end of the continuous oil tubing body 1 and be transported upward along the continuous oil tubing body 1. Along with the injection of high-temperature steam, part of the high-temperature steam enters through the port of the first channel 203 exposed above the liquid surface of the crude oil in the underground oil layer, and then moves upward along the first channel 203 synchronously with the crude oil. The high-temperature steam moves from bottom to top in the first channel 203 to achieve continuous heating of the crude oil transported upward in the continuous oil tubing body 1. The flow direction of the high-temperature steam is consistent with the direction in which the crude oil in the continuous oil tubing body 1 is transported upward, which can more effectively and directly provide stable steam heating for the transportation of the crude oil in the continuous oil tubing body 1, thereby ensuring the stability of the continuous oil tubing body 1 when transporting crude oil.

[0023] In the specific implementation process, Figure 5 , Fig. 9 and Fig.11 As shown, a plurality of equally spaced magnetic conductive plates 3 are orderly installed at the end of the coiled tubing body 1, and electromagnets 301 corresponding to the plurality of magnetic conductive plates 3 are orderly installed on the second flexible tube body 201, and the electromagnets 301 are magnetically attracted to the corresponding magnetic conductive plates 3 after being energized. When the device is used, the electromagnets 301 can obtain stable power supply support during the lowering and installation of the device, and the second flexible tube body 201 is stably connected to the end of the coiled tubing body 1 by means of the magnetic attraction of the electromagnets 301 to the corresponding magnetic conductive plates 3 after being energized. In this mode, the staff can effectively improve the connection between the coiled tubing body 1, the first flexible tube body 2, and the second flexible tube body 201. The pipe body 201 is conveniently and stably lowered into the underground oil layer along the oil production well. After the ends of the coiled tubing body 1 and the second hose body 201 are lowered into the lower space of the underground oil layer, the power supply of a plurality of equidistantly arranged electromagnets 301 is cut off from the ends of the coiled tubing body 1 and the second hose body 201, and the magnetic attraction with the corresponding magnetic conductive plate 3 is disconnected. The end of the coiled tubing body 1 stays in the lower space of the underground oil layer, while the end of the second hose body 201 rises upward with the buoyancy provided by the columnar airbag 202. Finally, the columnar airbag 202 carries the end of the second hose body 201 to float to the crude oil liquid surface in the underground oil layer, thereby realizing the stable deployment operation of the device.

[0024] During the operation of the device, the end of the second hose body 201 is vertically set on the crude oil liquid surface of the underground oil layer. Due to the elastic performance of the second hose body 201 itself, the main part of the second hose body 201 presents a curved structure. When the device needs to be recovered, it is only necessary to control the numerous orderly arranged electromagnets 301 to be powered on one by one in the direction opposite to the power-off direction to start the recovery. Figure 1 Taking the structure in the middle as an example, since the second hose body 201 is bent after being separated, the distance between the corresponding electromagnet 301 and the magnetic plate 3 gradually increases from left to right, and the distance between the leftmost electromagnet 301 and the magnetic plate 3 is the shortest. When the leftmost electromagnet 301 is powered on and started, the second hose body 201 is tightened toward the end of the coiled tubing body 1 by means of the magnetic attraction between it and the corresponding magnetic plate 3. Many electromagnets 301 are gradually powered on from left to right to generate magnetic attraction to the corresponding magnetic plate 3, so that the second hose body 201 is gradually pulled closer to the end of the coiled tubing body 1 from left to right, and finally the second hose body 201 is re-fitted and connected with the end of the coiled tubing body 1, which can effectively improve the convenience and stability of the device being extracted from the oil well after use.

[0025] In the specific implementation process, Figure 2 - Figure 4 and Figure 6 - Figure 8 As shown, a slot 4 matching the outer size of the continuous tubing body 1 is provided on one side of the first hose body 2 close to the continuous tubing body 1, and a plurality of equidistantly distributed snap rings 401 are sequentially snapped in at the end of the continuous tubing body 1, and a plurality of magnetic conductive plates 3 are fixed on the plurality of snap rings 401 in a one-to-one correspondence. When the device is used, the slot 4 matching the outer size of the continuous tubing body 1 is provided on the first hose body 2, and the snap ring 4 is snapped in engagement with the continuous tubing body 1, so that the convenience of disassembly and assembly between the first hose body 2 and the continuous tubing body 1 can be effectively improved. At the same time, the snap rings 401 corresponding to the plurality of magnetic conductive plates 3 are snapped in engagement with the end of the continuous tubing body 1, and the snap rings 401 are snapped in engagement with the continuous tubing body 1, so that the convenience of disassembly and assembly between the magnetic conductive plates 3 and the continuous tubing body 1 can also be effectively improved. With mutual cooperation, the flexibility and convenience of the device during assembly and use can be effectively improved.

[0026] When the first hose body 2 is firmly connected to the outside of the continuous tubing body 1 through the slot 4, the support member 9 is also required to be used. The support member 9 includes a ring frame 901 movably sleeved on the outside of the continuous tubing body 1, and a first support block 902 is fixedly installed on the right side of the upper end of the ring frame 901, and a second support block 903 is fixedly installed on the left side of the lower end of the ring frame 901, and the second support block 903 is close to The side of the first support block 902 is set to a groove 904 that is adapted to the outer size of the continuous tubing body 1, and the front and rear surfaces of the first support block 902 and the second support block 903 are both set to straight surfaces. With the support of the first support block 902 and the second support block 903, the C-shaped curved surface in the slot 4 can be expanded into a U-shaped curved surface. During the continuous transportation process of the continuous tubing body 1 and the first hose body 2, it is convenient for the slot 4 to be engaged with the outside of the continuous tubing body 1, and the first support block 902 and the second support block 903 are set The hollow structure is connected to an external air pump. The first support block 902, the second support block 903 and the groove 904 are provided with uniformly distributed spray holes 905. The air pump supplies air to the hollow structure inside the first support block 902 and the second support block 903. The airflow is finally ejected through the spray holes 905 provided on the first support block 902, the second support block 903 and the groove 904, forming an airflow layer acting between the inner end wall of the slot 4 and the first support block 902, the second support block 903, and between the continuous tubing body 1 and the groove 904. The friction resistance between the first support block 902, the second support block 903 and the inner end wall of the slot 4, as well as the friction resistance between the groove 904 and the continuous tubing body 1 can be effectively reduced through the flow of airflow, which is conducive to improving the efficiency and convenience of the staff in continuously opening the slot 4 with the help of the support member 9 to firmly connect the first hose body 2 to the continuous tubing body 1.

[0027] In the specific implementation process, Figure 1 As shown, an electric heating pipe 5 is installed at the end of the second flexible hose body 201. When the device is in use, the electric heating pipe 5 installed at the end of the second flexible hose body 201 is powered on and started. After the electric heating pipe 5 is powered on and started, the steam filled in the upper space in the underground oil layer is secondary heated. The secondary heating can effectively increase the temperature of the steam transported upward through the first channel 203, which is beneficial to further improve the stability of the device in transporting the steam in the underground oil layer from bottom to top through the first channel 203 and heating the continuous oil pipe body 1 from bottom to top.

[0028] In the specific implementation process, Figure 3 - Figure 5 and Fig.10 - Fig.12As shown, a second channel 6 is provided in the first hose body 2 and the second hose body 201, and the second channel 6 is connected to the inside of the columnar airbag 202, the electric heating tube 5 and the columnar airbag 202 are arranged side by side, an L-shaped airbag 601 is fixedly connected between the end of the columnar airbag 202 and the end of the electric heating tube 5, and the L-shaped airbag 601 is connected to the second channel 6, and the L-shaped airbag 601 forms a stable L-shaped structure after being inflated, a spring piece 602 is fixedly installed in the L-shaped airbag 601, and the spring piece 602 presents a U-shaped structure when not subjected to external force, an electromagnetic valve is installed at the connection between the columnar airbag 202 and the second channel 6, and an electromagnetic valve is also installed at the connection between the second channel 6 and the L-shaped airbag 601.

[0029] When the device is used, during the process of lowering the second flexible tube body 201 into the underground oil layer, the columnar airbag 202 is not inflated and is in a contracted state. In this state, the overall volume of the columnar airbag 202 is small, which facilitates the smooth movement of the device in the oil well. When the end of the second flexible tube body 201 is lowered to the predetermined position, the staff can inflate the columnar airbag 202 through the second channel 6, so that the columnar airbag 202 expands after being inflated. The buoyancy of the columnar airbag 202 is greatly improved after being inflated, which facilitates the device to carry the end of the second flexible tube body 201 to the crude oil liquid surface in the underground oil layer with the help of the buoyancy provided by the columnar airbag 202, and then the staff closes the second channel 6 and the columnar airbag 202. The electromagnetic valve between the columnar airbag 202 ensures the stability of inflation and expansion, and opens the electromagnetic valve between the second channel 6 and the L-shaped airbag 601. At this time, the airflow in the second channel 6 is filled into the L-shaped airbag 601, so that the L-shaped airbag 601 is inflated. After the L-shaped airbag 601 is inflated, it overcomes the elastic deformation force of the spring 602 and unfolds to form a stable L-shaped structure. With the help of the connection of the L-shaped airbag 601, the electric heating pipe 5 is swung into a state perpendicular to the columnar airbag 202, so that the electric heating pipe 5 is finally arranged in a horizontal state on the crude oil liquid surface of the underground oil layer, which can effectively increase the contact area between the electric heating pipe 5 and the steam in the upper space of the underground oil layer, which is beneficial to improving the effect of the electric heating pipe 5 on the secondary heating of the steam.

[0030] When the device is ready to be recovered, the staff first controls the L-shaped airbag 601 to be connected to the second channel 6, and performs an air extraction operation on the L-shaped airbag 601 through the second channel 6. After the gas in the L-shaped airbag 601 is extracted, the movable electric heating tube 5 is reversed under the elastic reset of the spring piece 602, and is again in a state of being aligned with the columnar airbag 202. Then the staff controls the columnar airbag 202 to be connected to the second channel 6, and performs an air extraction operation on the columnar airbag 202 through the second channel 6, so that the columnar airbag 202 is evacuated and contracted. After contraction, the air provided by the columnar airbag 202 is The buoyancy is greatly reduced, and the staff can use the gradual power-on of the numerous electromagnets 301 to reconnect the second hose body 201 to the end of the coiled tubing body 1, and the operation is orderly and stable, which improves the convenience of the installation and recovery of the device to a certain extent. When the device is not deployed, the electric heating tube 5 is stored between the coiled tubing body 1 and the columnar airbag 202, which can provide a certain degree of protection for the electric heating tube 5, avoiding accidental collision damage to the electric heating tube 5 during the installation and recovery of the device, which is conducive to extending the service life of the electric heating tube 5.

[0031] In the specific implementation process, Figure 1 - Figure 3 and Figure 5 As shown, the first hose body 2 and the second hose body 201 are provided with a third channel 7, and the third channel 7 is arranged side by side with the first channel 203, the end of the third channel 7 points to the electric heating tube 5, the steam flow direction in the third channel 7 is opposite to the steam flow direction in the first channel 203, and the end of the third channel 7 is also fixedly installed with an electric control valve, the upper ends of the first channel 203 and the third channel 7 are connected with a connector 8, and the connector 8 includes a carrier 801, one end of the carrier 801 is provided with a first through pipe 802, and the first through pipe 802 is externally connected to a high-temperature steam supply device, and the other end of the carrier 801 is provided with a second through pipe 803 connected to the upper end of the third channel 7, and the carrier 801 is provided with a cavity 804 connected between the first through pipe 802 and the second through pipe 803, and a nozzle 805 connected to the first through pipe 802 is fixedly installed in the cavity 804, and the nozzle 805 points to the second through pipe 803, and the carrier 801 is provided with a third through pipe 806 connected to the inner end wall of the cavity 804, and the third through pipe 806 is connected to the upper end of the first channel 203.

[0032] When the device is used, during the steam transportation process, heat energy is consumed, so that the longer the transportation distance is, the lower the temperature of the steam is, and the worse the heating effect on the coiled tubing body 1 is. This makes the temperature in the coiled tubing body 1 gradually decrease from bottom to top when the high-temperature steam transported upward through the first channel 203 heats the coiled tubing body 1. Therefore, when the high-temperature steam is transported from bottom to top through the first channel 203, the high-temperature steam is also transported from top to bottom through the third channel 7. The influence of the high-temperature steam heating in the third channel 7 on the coiled tubing body 1 gradually decreases from top to bottom. Through the neutralization of the first channel 203 and the third channel 7, the coiled tubing body 1 is heated continuously and stably by steam, which is conducive to further improving the smoothness and stability of the flow of crude oil in the coiled tubing body 1 during oil production.

[0033] When the first channel 203 and the third channel 7 are used to cooperate with each other to steam heat the coiled tubing body 1, the steam in the first channel 203 flows from bottom to top, and under the transportation of the external high-temperature steam supply device, the high-temperature steam enters the connecting member 8 through the first through pipe 802, is directly injected into the second through pipe 803 through the nozzle 805, and then enters the third channel 7, and steam transportation is performed from top to bottom in the third channel 7. In the process of the steam being injected into the second through pipe 803 through the nozzle 805, due to the high-speed flow of the high-temperature steam, a low-pressure area can be formed in the cavity 804 under the Bernoulli effect, thereby forming a negative pressure suction effect to the outside, and finally the steam in the first channel 203 enters the cavity 804 through the third through pipe 806, and the steam moving upward in the first channel 203 enters the second through pipe 803 through the cavity 804, and then flows downward again from the third channel 7, and finally the low-temperature steam is sprayed to the electric heating pipe 5 through the end of the third channel 7 to be heated again, so as to realize the recycling of steam, which is conducive to realizing the saving and recycling of steam energy.

[0034] Specifically, the working principle and operation method of the present invention are as follows: When using the SAGD technology to exploit crude oil in an underground oil layer, a large amount of high-temperature and high-pressure steam is transported to the upper space in the underground oil layer through the steam injection pipe 101 to heat the crude oil in the bottom oil layer, and with the help of continuous filling of steam, the crude oil is pressed out through the continuous oil pipe body 1, and the crude oil is transported from bottom to top with the help of the continuous oil pipe body 1. A small amount of high-temperature steam introduced into the upper space in the underground oil layer is transported from bottom to top through the first channel 203, and moves synchronously with the exploitation of crude oil to achieve steam heating operation of the continuous oil pipe body 1 from bottom to top. Simultaneously, the high-temperature steam can move from top to bottom through the third channel 7 to achieve steam heating operation of the continuous oil pipe body 1 from top to bottom. The cooperation of the two can effectively improve the continuous stability of the steam heating of the continuous oil pipe body 1.

[0035] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A downhole coiled tubing heating assembly for oil production, comprising a coiled tubing body (1), and a steam injection pipe (101) arranged in parallel with the coiled tubing body (1), the ends of the coiled tubing body (1) are inserted into a lower space in an underground oil layer, the ends of the steam injection pipe (101) are inserted into an upper space in an underground oil layer, and the upper end of the steam injection pipe (101) is externally connected to a high-temperature steam supply device, characterized in that: A first hose body (2) arranged side by side is mounted on the outer end wall of the coiled tubing body (1), and the first hose body (2) is firmly connected to the coiled tubing body (1). The end of the first hose body (2) is connected to the second hose body (201), and the end of the second hose body (201) is mounted with a columnar airbag (202), the columnar airbag (202) is vertically suspended on the crude oil liquid surface in the underground oil layer, the first hose body (2) and the second hose body (201) are both provided with a first channel (203), and the end of the first channel (203) extends to the outside of the columnar airbag (202) and is located on the crude oil liquid surface in the underground oil layer, and an electric control valve is fixedly mounted on the end of the first channel (203).

2. A downhole coiled tubing heating assembly for oil production according to claim 1, characterized in that: The end of the coiled tubing body (1) is provided with a plurality of equally spaced magnetic conductive plates (3) in an orderly manner, and the second hose body (201) is provided with electromagnets (301) arranged in a one-to-one correspondence with the plurality of magnetic conductive plates (3) in an orderly manner, and the electromagnets (301) are magnetically attracted to the corresponding magnetic conductive plates (3) when energized.

3. A downhole coiled tubing heating assembly for oil production according to claim 2, characterized in that: A clamping groove (4) adapted to the outer size of the coiled tubing body (1) is provided on one side of the first hose body (2) close to the coiled tubing body (1); a plurality of equidistantly distributed clamping rings (401) are sequentially clamped at the end of the coiled tubing body (1); and a plurality of magnetic conductive plates (3) are fixed on the plurality of clamping rings (401) in a one-to-one correspondence.

4. A downhole coiled tubing heating assembly for oil production according to claim 1, characterized in that: An electric heating pipe (5) is installed at the end of the second flexible tube body (201).

5. A downhole coiled tubing heating assembly for oil production according to claim 4, characterized in that: A second channel (6) is provided in both the first flexible tube body (2) and the second flexible tube body (201), and the second channel (6) is in communication with the interior of the columnar airbag (202).

6. A downhole coiled tubing heating assembly for oil production according to claim 5, characterized in that: The electric heating tube (5) and the columnar airbag (202) are arranged side by side, an L-shaped airbag (601) is fixedly connected between the end of the columnar airbag (202) and the end of the electric heating tube (5), and the L-shaped airbag (601) is connected to the second channel (6), and the L-shaped airbag (601) forms a stable L-shaped structure after being inflated.

7. A downhole coiled tubing heating assembly for oil production according to claim 6, characterized in that: A spring sheet (602) is fixedly installed in the L-shaped airbag (601), and the spring sheet (602) presents a U-shaped structure when no external force is applied.

8. A downhole coiled tubing heating assembly for oil production according to claim 7, characterized in that: A solenoid valve is installed at the connection point between the columnar airbag (202) and the second channel (6), and a solenoid valve is also installed at the connection point between the second channel (6) and the L-shaped airbag (601).

9. A downhole coiled tubing heating assembly for oil production according to claim 1, characterized in that: A third channel (7) is provided in both the first flexible tube body (2) and the second flexible tube body (201), and the third channel (7) and the first channel (203) are arranged side by side, the end of the third channel (7) points to the electric heating tube (5), the steam flow direction in the third channel (7) is opposite to the steam flow direction in the first channel (203), and an electric control valve is also fixedly installed at the end of the third channel (7).

10. A downhole coiled tubing heating assembly for oil production according to claim 9, characterized in that: The upper ends of the first channel (203) and the third channel (7) are connected with a connecting piece (8), and the connecting piece (8) comprises a carrier (801), a first through pipe (802) is provided inside one end of the carrier (801), and the first through pipe (802) is externally connected to a high-temperature steam supply device, a second through pipe (803) is provided at the other end of the carrier (801) and is connected to the upper end of the third channel (7), a cavity (804) connected between the first through pipe (802) and the second through pipe (803) is provided in the carrier (801), a nozzle (805) connected to the first through pipe (802) is fixedly installed in the cavity (804), and the nozzle (805) points into the second through pipe (803), and a third through pipe (806) connected to the inner end wall of the cavity (804) is provided in the carrier (801), and the third through pipe (806) is connected to the upper end of the first channel (203).

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