Wellhead lifting internal visual monitoring device

Abstract

The utility model discloses an internal visual monitoring device for wellhead lifting. The technical problem that the lifting height of a casing pipe is not accurately measured is solved. The device comprises a Christmas tree used for being connected to a wellhead, and a casing pipe is located in the Christmas tree; the image acquisition device is arranged in the Christmas tree and is used for shooting the casing pipe; the image display device is used for displaying an image of the sleeve; the threading hole is formed in the Christmas tree; one end of the data transmission cable is connected with the image acquisition device, and the other end of the data transmission cable penetrates through the threading hole and is connected with the image display device; and the image acquisition device shoots the position of the sleeve in real time, and transmits the shot information to the image display device through the data transmission cable to display the position image information of the sleeve, so that a worker can intuitively judge the height change condition of the sleeve according to the image. The device can monitor the lifting height of the casing in real time from the inside of a wellhead, the measurement result is more accurate, the operation is more convenient, and the output image is simple and visual.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction technology, specifically relating to a wellhead lifting internal visualization monitoring device. Background Technology

[0002] During the steam injection extraction of heavy oil, the high fluid temperature causes excessive axial thermal stress in the casing due to heat conduction, leading to casing deformation. This in turn causes the casing and wellhead to rise, and the spatial position of the wellhead on the ground changes, resulting in deformation or even damage to the steam injection and production pipelines around the wellhead.

[0003] In heavy oil extraction, casing rise compensation devices are often used to compensate for changes in casing length. Wellhead rise is directly related to problems such as wellhead device seal failure and casing damage, posing a threat to production safety. Especially in offshore heavy oil thermal recovery wells where the gas injection temperature can reach as high as 350℃, the effectiveness of casing rise compensation devices is difficult to determine. Even with casing rise compensation devices, wellhead rise still occurs in thermal recovery gas injection wells. Due to the special nature of the offshore working environment, if casing and wellhead rise are not effectively monitored and controlled, it will pose a significant threat to the safety of the platform and personnel. Therefore, wellhead rise monitoring is a pressing problem that urgently needs to be solved.

[0004] When heavy oil thermal recovery is carried out on offshore platforms, external devices are used to monitor wellhead lift. For example, a ruler is welded to the wellhead and a metal strip is welded to the deck as a pointer for indication. The wellhead lift is recorded manually. However, this type of external monitoring method has large monitoring errors and low reliability, and needs to be improved. Utility Model Content

[0005] To address all or some of the aforementioned problems, the present invention aims to provide a wellhead lift internal visualization monitoring device that can monitor the casing lift height in real time from inside the wellhead, resulting in more accurate measurement results, more convenient operation, and simple and intuitive output images.

[0006] This utility model provides a wellhead rise internal visualization monitoring device, including:

[0007] A tree is used to connect to the wellhead, and the casing is located inside the tree;

[0008] An image acquisition device is installed inside the wellhead and is used to photograph the casing;

[0009] Image display device for displaying images of the sleeve;

[0010] A wire-threading hole is provided on the oil production tree;

[0011] A data transmission cable, one end of which is connected to the image acquisition device, and the other end passes through the wire hole and is connected to the image display device;

[0012] The image acquisition device captures the position of the sleeve in real time and transmits the captured information to the image display device via the data transmission cable to display the position image information of the sleeve, so that the staff can intuitively judge the height change of the sleeve based on the image.

[0013] Optionally, the image acquisition device includes an image acquisition unit and a hanger, wherein the image acquisition unit and / or the data transmission cable are connected to the hanger, and the hanger is connected to the inner wall of the wellhead.

[0014] Optionally, the hanger includes a magnetic base and a suspension bracket. The magnetic base is magnetically fixed to the inner wall of the oil well tree, the suspension bracket is fixed to the magnetic base, and the image acquisition device and / or the data transmission cable are fixed to the suspension bracket.

[0015] Optionally, the outer wall of the oil well tree is provided with a sealing groove that communicates with the through hole, and a sealing plug is threaded into the sealing groove. The data transmission cable passes through the sealing plug and is sealed and fixedly connected to the sealing plug.

[0016] Optionally, a metal sealing ring and two graphite sealing rings are provided in the sealing groove. The two graphite sealing rings abut against both sides of the metal sealing ring. The data transmission cable passes through the metal sealing ring and the two graphite sealing rings and forms a sealing fit with the metal sealing ring and the two graphite sealing rings respectively. The sealing plug presses the metal sealing ring and the two graphite sealing rings together and confines them within the sealing groove.

[0017] Optionally, the data transmission cable includes a metal-armored signal transmission cable, a blowout preventer, and a rubber-insulated signal transmission cable connected in sequence. The metal-armored signal transmission cable passes through the through hole and is connected to the image acquisition device, and the rubber-insulated signal transmission cable is connected to the image display device.

[0018] Optionally, a shut-off valve is connected to the metal-armored signal transmission cable to control the annular gap between the outer protective layer and the cable body of the metal-armored signal transmission cable.

[0019] Optionally, the metal-armored signal transmission cable is connected to a tee connector, which is located between the shut-off valve and the shut-off blowout preventer. The metal-armored signal transmission cable passes through two of the ports of the tee connector, and the other port of the tee connector is connected to a pressure detection device to realize the pressure detection of the medium in the annular gap between the outer protective layer of the metal-armored signal transmission cable and the cable body.

[0020] Optionally, the pressure detection device includes a pressure detection tube and a pressure detection gauge. The pressure detection tube is connected to the tee connector and communicates with the annular gap between the outer protective layer and the cable body of the metal armored signal transmission cable. The pressure detection gauge is connected to the end of the pressure detection tube away from the tee connector.

[0021] Optionally, a shut-off valve is connected to the pressure detection tube to achieve cut-off control of the pressure detection tube.

[0022] As can be seen from the above technical solution, the wellhead lifting internal visualization monitoring device provided by this utility model has the following advantages:

[0023] This device can monitor the casing lift-up height in real time from inside the wellhead, providing more accurate measurements, easier operation, and simpler, more intuitive output images. Furthermore, its structure is simpler, installation is easier, performance is more stable, and operating costs are lower, making it suitable for widespread adoption.

[0024] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0025] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 Enlarged view of region A in the middle;

[0028] Figure 3 This is a schematic diagram of the data transmission cable in an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Wellhead; 2. Image acquisition device; 21. Image acquisition unit; 22. Hanger; 221. Magnetic base; 222. Hanging bracket; 3. Image display device; 4. Wiring hole; 5. Data transmission cable; 51. Metal-armored signal transmission cable; 52. Blowout preventer; 53. Rubber-insulated signal transmission cable; 6. Sealing groove; 7. Sealing plug; 8. Metal sealing ring; 9. Graphite sealing ring; 10. Shut-off valve; 11. T-joint; 12. Pressure detection device; 121. Pressure detection tube; 122. Pressure gauge; 123. Shut-off valve. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be arbitrarily combined with each other.

[0032] like Figure 1 , Figure 2 , Figure 3 The illustration shows an embodiment of the present invention, which discloses an internal visualization monitoring device for wellhead lift. The device includes a tree (or pre-works tree) 1, which is fixed at the wellhead, with the casing located inside the tree. An image acquisition device 2 is installed inside the tree 1, and an image display device 3 is installed externally. A wiring hole 4 is provided on the tree 1, through which a data transmission cable 5 is threaded. One end of the data transmission cable 5 is connected to the image acquisition device 2, and the other end passes through the wiring hole 4 and is connected to the image display device 3.

[0033] In this embodiment, the image display device 3 can be installed in the central control room. The image acquisition device 2 is used to capture the position of the casing in real time and transmit the captured information to the image display device 3 through the data transmission cable 5. The image display device 3 has display and signal processing capabilities (i.e., built-in signal processor and other components), and can display the image signals acquired by the image acquisition device 2. It can also process the real-time acquired casing images inside the wellhead according to the principles of digital imaging to calculate the casing lift height inside the wellhead, so that the staff can monitor the casing lift height inside the wellhead in real time, intuitively and visually, and the measurement results are more accurate.

[0034] In one embodiment, such as Figure 1 , Figure 2 As shown, the image acquisition device 2 includes an image acquisition unit 21 and a hanger 22. The image acquisition unit 21 and / or the data transmission cable 5 are connected to the hanger 22, and the hanger 22 is connected to the inner wall of the tree 1. The hanger 22 includes a magnetic base 221 and a suspension bracket 222. The magnetic base 221 is magnetically fixed to the inner wall of the tree 1, the suspension bracket 222 is fixed to the magnetic base 221, and the image acquisition unit 21 and / or the data transmission cable 5 are fixed to the suspension bracket 222.

[0035] In this embodiment, the imaging camera of the image acquisition device 21 is covered with high-temperature resistant quartz glass, providing good light transmission and sealing performance. Furthermore, the image acquisition device 21 has an overall temperature resistance of 350℃ and a pressure resistance of 21MPa to ensure stable operation. The data transmission cable 5 consists of an outer protective layer and a cable body (the cable body includes a video cable, insulation layer, shielding layer, etc.). The cable can be covered with an 825 or 625 stainless steel capillary tube, with a temperature resistance of 350℃ and a pressure resistance of 21MPa to adapt to the high-temperature, high-pressure, and corrosive working environment inside the wellhead.

[0036] In one embodiment, such as Figure 1 , Figure 2 As shown, the outer wall of the wellhead 1 is provided with a sealing groove 6 that communicates with the cable hole 4. A sealing plug 7 is threaded into the sealing groove 6. The data transmission cable 5 passes through the sealing plug 7 and is sealed and fixedly connected to the sealing plug 7 to improve the sealing effect between the data transmission cable 5 and the wellhead 1.

[0037] In one embodiment, such as Figure 1 , Figure 2 As shown, a metal sealing ring 8 and two graphite sealing rings 9 are disposed within the sealing groove 6, with the outer walls of the metal sealing ring 8 and the two graphite sealing rings 9 respectively tightly abutting against the inner wall of the sealing groove 6. The metal sealing ring 8 is located between the two graphite sealing rings 9 and abuts against each of the two graphite sealing rings 9, while the sealing plug 7 presses the metal sealing ring 8 and the two graphite sealing rings 9 together and confines them within the sealing groove 6. Simultaneously, the data transmission cable 5 passes through the metal sealing ring 8 and the two graphite sealing rings 9, forming a sealing fit with each of the metal sealing ring 8 and the two graphite sealing rings 9 to improve the sealing effect.

[0038] Because the graphite sealing ring 9 has strong unevenness compensation capability and good corrosion resistance, the metal sealing ring 8 and the two graphite sealing rings 9 can gradually lock the outer wall of the data transmission cable 5 under the progressively increasing tightening torque of the sealing plug 7, so as to achieve reliable sealing at 350℃ and 21MPa, thereby adapting to the corrosive working environment inside the wellhead and ensuring the sealing of the data transmission cable 5 when crossing the production tree 1.

[0039] In one embodiment, such as Figure 1 , Figure 3 As shown, the data transmission cable 5 includes a metal-armored signal transmission cable 51, a blowout preventer 52, and a rubber-insulated signal transmission cable 53 connected in sequence. The metal-armored signal transmission cable 51 passes through the wire hole 4 and is connected to the image acquisition device 2, while the rubber-insulated signal transmission cable 53 is connected to the image display device 3.

[0040] Because the metal-armored signal transmission cable 51 is relatively stiff, it ensures its crossing ability and structural stability, while the rubber-insulated signal transmission cable 53 is relatively soft, facilitating its wiring and installation. The blowout preventer 52 enables the connection of the wire cores between the two types of transmission cables and seals the connection points, preventing leakage at the connection points between the wire cores.

[0041] In one embodiment, such as Figure 1 , Figure 3As shown, a shut-off valve 10 is connected to the metal-armored signal transmission cable 51. The shut-off valve 10 is located outside the tree 1, and the shut-off valve 10 can control the annular gap between the outer protective layer of the metal-armored signal transmission cable 51 and the cable body.

[0042] If the outer protective layer of the metal-armored signal transmission cable 51 is damaged, well fluid or gas and other media will enter the annular gap between the outer protective layer and the cable body. At this time, the shut-off valve 10 can cut off the annular gap, thereby effectively cutting off the well fluid or gas and other media to prevent downhole pressure from being transmitted to the surface, thus ensuring the personal safety of the personnel.

[0043] In one embodiment, such as Figure 1 , Figure 3 As shown, a T-connector 11 is connected to the metal-armored signal transmission cable 51. The T-connector 11 is located between the shut-off valve 10 and the shut-off blowout preventer 52. The metal-armored signal transmission cable 51 passes through two of the ports of the T-connector 11, and the other port of the T-connector 11 is connected to a pressure detection device 12 to realize the pressure detection of the medium in the annular gap between the outer protective layer of the metal-armored signal transmission cable 51 and the cable body.

[0044] In one embodiment, such as Figure 1 , Figure 3 As shown, the pressure detection device 12 includes a pressure detection tube 121 and a pressure gauge 122. The pressure detection tube 121 is connected to a tee connector 11 and communicates with the annular gap between the outer protective layer and the main body of the metal-armored signal transmission cable 51. The pressure gauge 122 is connected to the end of the pressure detection tube 121 away from the tee connector 11. Simultaneously, a shut-off valve 123 is connected to the pressure detection tube 121 to achieve cut-off control of the pressure detection tube 121, thereby ensuring the personal safety of the personnel.

[0045] As described above, this device can monitor the casing rise height in real time from inside the wellhead, providing accurate measurement results, simple and intuitive output images, and enabling remote signal transmission. Furthermore, the device has a simple structure and reliable performance, meeting the wellhead rise monitoring requirements of offshore thermal recovery wells, and simultaneously verifying the compensation function of the casing rise compensation device inside the wellhead.

[0046] It should be noted that, unless otherwise stated, the technical or scientific terms used in this utility model shall have the ordinary meaning as understood by those skilled in the art to which this utility model pertains.

[0047] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A wellhead lifting internal visualization monitoring device, characterized in that, include: A tree (1) is used to connect to the wellhead, and the casing is located inside the tree (1); An image acquisition device (2) is installed inside the oil well (1) and is used to photograph the casing; Image display device (3) for displaying images of the sleeve; A wire hole (4) is provided on the oil production tree (1); A data transmission cable (5) is connected at one end to the image acquisition device (2) and at the other end through the wire hole (4) and connected to the image display device (3); The image acquisition device (2) captures the position of the sleeve in real time and transmits the captured information to the image display device (3) through the data transmission cable (5) to display the position image information of the sleeve, so that the staff can intuitively judge the height change of the sleeve based on the image.

2. The wellhead lift internal visualization monitoring device according to claim 1, characterized in that, The image acquisition device (2) includes an image acquisition unit (21) and a hanger (22). The image acquisition unit (21) and / or the data transmission cable (5) are connected to the hanger (22), and the hanger (22) is connected to the inner wall of the tree (1).

3. The wellhead lifting internal visualization monitoring device according to claim 2, characterized in that, The hanger (22) includes a magnetic base (221) and a suspension bracket (222). The magnetic base (221) is magnetically fixed to the inner wall of the oil well (1). The suspension bracket (222) is fixed on the magnetic base (221), and the image acquisition device (21) and / or the data transmission cable (5) are fixed on the suspension bracket (222).

4. The wellhead lift internal visualization monitoring device according to claim 1, characterized in that, The outer wall of the oil well (1) is provided with a sealing groove (6) that communicates with the through hole (4). A sealing plug (7) is threaded into the sealing groove (6). The data transmission cable (5) passes through the sealing plug (7) and is sealed and fixedly connected to the sealing plug (7).

5. The wellhead lift internal visualization monitoring device according to claim 4, characterized in that, The sealing groove (6) is provided with a metal sealing ring (8) and two graphite sealing rings (9). The two graphite sealing rings (9) abut against both sides of the metal sealing ring (8). The data transmission cable (5) passes through the metal sealing ring (8) and the two graphite sealing rings (9) and forms a sealing fit with the metal sealing ring (8) and the two graphite sealing rings (9) respectively. The sealing plug (7) presses the metal sealing ring (8) and the two graphite sealing rings (9) together and confines them in the sealing groove (6).

6. The wellhead lifting internal visualization monitoring device according to claim 1, characterized in that, The data transmission cable (5) includes a metal armored signal transmission cable (51), a blowout preventer (52), and a rubber insulated signal transmission cable (53) connected in sequence. The metal armored signal transmission cable (51) passes through the wire hole (4) and is connected to the image acquisition device (2). The rubber insulated signal transmission cable (53) is connected to the image display device (3).

7. The wellhead lift internal visualization monitoring device according to claim 6, characterized in that, A shut-off valve (10) is connected to the metal armored signal transmission cable (51) to control the annular gap between the outer protective layer and the cable body of the metal armored signal transmission cable (51).

8. The wellhead lift internal visualization monitoring device according to claim 7, characterized in that, A three-way connector (11) is connected to the metal armored signal transmission cable (51). The three-way connector (11) is located between the shut-off valve (10) and the shut-off blowout preventer (52). The metal armored signal transmission cable (51) passes through two of the ports of the three-way connector (11), and the other port of the three-way connector (11) is connected to a pressure detection device (12) to realize the pressure detection of the medium in the annular gap between the outer protective layer of the metal armored signal transmission cable (51) and the cable body.

9. The wellhead lift internal visualization monitoring device according to claim 8, characterized in that, The pressure detection device (12) includes a pressure detection tube (121) and a pressure detection gauge (122). The pressure detection tube (121) is connected to the tee connector (11) and communicates with the annular gap between the outer protective layer and the main body of the metal armored signal transmission cable (51). The pressure detection gauge (122) is connected to the end of the pressure detection tube (121) away from the tee connector (11).

10. The wellhead lift internal visualization monitoring device according to claim 9, characterized in that, A shut-off valve (123) is connected to the pressure detection tube (121) to achieve cut-off control of the pressure detection tube (121).

Images