Underground television imaging device

Abstract

The utility model relates to an underground television imaging device, and belongs to the technical field of petroleum engineering logging. The underground television imaging device comprises an underground television instrument, and the underground television instrument comprises a shell and a camera module arranged in the shell. The underground television imaging device further comprises an outer cylinder arranged outside the underground television instrument, a spray head connected to the bottom of the outer cylinder and a connector which is connected with the shell and the outer cylinder and used for being connected with a pipe column or a drill rod at the same time, and an annular space forming a flushing fluid channel is formed between the outer cylinder and the shell. The connector is provided with a flushing fluid channel used for draining flushing fluid entering the connector to the annulus. And the nozzle is provided with a first spraying channel which is communicated with the annular space and is used for spraying flushing fluid to the camera module. According to the underground television imaging device, the flushing fluid is directly sprayed to the camera module, so that the camera related parts of the underground television instrument can be better cleaned, and the self-cleaning function of the camera lens is realized.

Description

Technical Field

[0001] The utility model relates to a downhole television imaging device, belonging to the technical field of petroleum engineering well logging. Background Art

[0002] In the repair of faulty wells in oil and gas fields, it is necessary to identify and evaluate the downhole casing condition or the fish top of fallen objects, so as to provide a reference for the selection of tools for the subsequent salvage process and the well repair supporting process. The traditional lead printing method cannot accurately and intuitively reflect the real situation of the fish top, and can only make indirect judgments with poor accuracy. Especially for complex fish tops, problems such as empty fish tops and fish loss often occur due to the selection of inappropriate salvage tools, which increases the difficulty of the operation and prolongs the operation cycle. Downhole television logging technology can directly present the downhole conditions visually, with the advantages of being intuitive, efficient, large in information volume, and high in credibility.

[0003] Downhole TV logging technology can directly detect the condition of the wellbore, casing and fish top in the well, but it has very high requirements for the cleanliness of the wellbore. It is necessary to clean the dead oil and impurities in the wellbore and replace the medium in the wellbore with clean water. In actual work, most wellbores cannot reach this highly clean state after washing, which causes the downhole optical camera to be blocked by oil or impurities during the logging process. Conventional downhole TV logging instruments do not have the function of self-cleaning in the well. Once the camera is blocked by oil during the downhole or logging process, the logging can only be terminated, resulting in logging failure.

[0004] In recent years, downhole TV flushing tools have emerged that can clean the oil stains that block the camera in the well, which can greatly improve the success rate of logging. For example, the utility model patent with the authorization announcement number CN212428653U and the authorization announcement date of January 29, 2021 discloses a downhole TV flushing tool through a core continuous oil pipe. The tool includes a guide protective sleeve and a flexible short section, a flushing short section, a sealing fixed short section and a cable head connected in sequence from top to bottom. The cable head is connected to the downhole TV below. The downhole TV The lower outer side is connected to the side view lens, the bottom end of the downhole TV is connected to the downhole view lens, the downhole TV, cable head, sealed fixed short section, flushing short section are sleeved with the guide protective sleeve outside, and there is a cavity as a flushing liquid channel between the downhole TV, cable head, sealed fixed short section, flushing short section and guide protective sleeve. The central axis of the sealed fixed short section, the central axis of the flushing short section and the central axis of the flexible short section are all hollow structures and the cable passes through the hollow structure. The flushing short section opens a water hole along the outer wall toward the central axis, and the lower end of the cable is connected to the cable head. When flushing the downhole TV, the flushing liquid enters the hollow structure and is sprayed downward along the cavity through the water hole to the bottom of the guide protective sleeve at high speed, and then is sprayed out at high speed through multiple bottom water holes at the bottom of the guide protective sleeve. However, due to the high viscosity of the dirty oil, it adheres to the lens with a strong viscosity and is not easy to remove when flushing with the above-mentioned downhole TV flushing tool. Utility Model Content

[0005] The utility model aims to provide a downhole television imaging device to solve the problem that the existing downhole television flushing tools are not easy to clean the oil stains on the lens.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A downhole television imaging device includes a downhole television instrument, which includes a shell and a camera module arranged in the shell. The downhole television imaging device also includes an outer tube arranged outside the downhole television instrument, a nozzle connected to the bottom of the outer tube, and a connector connected to the shell and the outer tube for connecting to a pipe column or a drill pipe. An annulus forming a flushing fluid channel is provided between the outer tube and the shell, and the connector is provided with a flushing fluid channel for draining flushing fluid entering the connector to the annulus; the nozzle is provided with a first injection channel connected to the annulus for injecting flushing fluid to the camera module.

[0008] The utility model improves the existing device by providing a first injection channel for spraying flushing liquid to the camera module of the downhole television on the nozzle. By directly spraying flushing liquid to the camera module, the camera-related components of the downhole television can be better cleaned, the self-cleaning function of the camera lens can be realized, and the downhole video recording and flushing functions are integrated. The wellbore and fallen fish can be flushed and cleaned before the image is recorded, thereby ensuring the clarity and reliability of the video recording and improving the test success rate.

[0009] The utility model has a simple structure for downhole television imaging device, and can be transported to the target well section by oil pipe or drill pipe during operation, thereby reducing the risk of encountering obstruction during the downhole operation. It is suitable for recording video imaging data in the wellbore of conventional wells, highly deviated wells, horizontal wells, and wells with complex well conditions, and can guide well repair and salvage operations, thereby improving operation efficiency.

[0010] Furthermore, the nozzle also includes a second injection channel connected to the annulus for spraying flushing liquid downward along the extension direction of the outer cylinder.

[0011] Furthermore, the nozzle is annular, the first injection channel includes a flow hole connected to the annulus and a first ejection hole connected to the flow hole, and the first ejection hole extends from the flow hole to the inside of the nozzle; the second injection channel includes a flow hole shared with the first injection channel and a second ejection hole connected to the flow hole.

[0012] Furthermore, a plurality of first injection channels are provided, and the flow holes of each first injection channel are evenly arranged in the circumferential direction of the nozzle.

[0013] Furthermore, the downhole television also includes a hemispherical protective cover for protecting the camera module; the hemispherical protective cover is sealed and fixedly connected to the lower end of the shell of the downhole television.

[0014] Further, the communication position between the first ejection hole and the flow hole is lower than the lowest point of the hemispherical protective cover, and the first ejection hole extends in a straight line from the communication position with the flow hole to the hemispherical protective cover.

[0015] Furthermore, an external thread is provided on the outer side of the nozzle; the nozzle is threadably connected to the outer cylinder via the external thread, and the inner side of the nozzle abuts against the shell of the downhole television.

[0016] Furthermore, the connector includes a first pipe segment and a second pipe segment connected below the first pipe segment, the pipe cavity of the second pipe segment is connected to the pipe cavity of the first pipe segment, the first pipe segment is threadedly connected to the outer tube, the second pipe segment is threadedly connected to the shell, and the second pipe segment is provided with a connecting hole for connecting the pipe cavity of the second pipe segment and the annulus.

[0017] Furthermore, the upper end of the first pipe section is provided with an internal thread, and the connector is connected to the oil pipe or the drill pipe via the internal thread.

[0018] Furthermore, the downhole television instrument also includes a data storage control module arranged in the shell for controlling the operation of the optical camera module and storing data, and a battery module for supplying power to the optical camera module and the data storage control module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a downhole television imaging device according to Embodiment 1 of the utility model;

[0020] Figure 2 This is a bottom view of the downhole television imaging device of Example 1 of the utility model;

[0021] Figure 3 It is a schematic diagram of the annular nozzle of the downhole television imaging device of Example 1 of the utility model;

[0022] Figure 4 This is a schematic structural diagram of a connector in a downhole television imaging device according to Embodiment 1 of the utility model;

[0023] Among them, 1-connector, 1a-first external thread, 1b-second external thread, 1c-connecting hole; 2-outer cylinder; 3-storage downhole television; 4-annulus; 5-battery module; 6-data storage control module; 7-optical camera module, 7a-LED light source, 7b-wide-angle camera, 7c-hemispherical protective cover; 8-annular nozzle, 8a-first ejection hole, 8b-second ejection hole, 8c-flow hole; 9-cylindrical shell. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is further described below in conjunction with specific implementation methods.

[0025] Example 1

[0026] The downhole television imaging device of this embodiment is as follows: Figures 1 to 4 As shown, it includes a connector 1, an outer tube 2, a storage-type downhole television 3, and an annular nozzle 8;

[0027] The storage-type downhole television 3 includes a cylindrical shell 9 and a battery module 5, a data storage control module 6, an optical camera module 7 and a hemispherical protective cover 7c arranged in the cylindrical shell 9 from top to bottom. The battery module 5 can supply power to the data storage control module 6 and the optical camera module 7. The optical camera module 7 is electrically connected to the data storage control module 6. The data storage control module 6 controls the optical camera module 7 to work and store data. The storage-type downhole television 3 is arranged in the inner cavity of the outer tube 2, and an annulus 4 is formed between the cylindrical shell 9 and the outer tube 2.

[0028] Optical camera module 7 Figure 2 As shown, it includes a wide-angle camera 7b and a plurality of LED light sources 7a evenly distributed around the wide-angle camera 7b; a hemispherical protective cover 7c is formed by processing a highly light-transmitting hard material, connected to the lower end of the inner wall of the cylindrical shell 9 and sealed by a sealant, which can protect the optical camera module 7 to prevent the wide-angle lens from being worn and can prevent the flushing fluid from entering the cylindrical shell 9 to damage the storage-type downhole television.

[0029] Connector 1 Figure 4 As shown, it includes a first pipe section and a second pipe section connected below the first pipe section, the outer diameter of the first pipe section is larger than the outer diameter of the second pipe section and the lumens of the two pipe sections are connected, a first external thread 1a is provided on the outer side of the lower end of the first pipe section, a second external thread 1b is provided on the outer side of the lower end of the second pipe section and a connecting hole 1c is provided above the second external thread 1b, and the inner cavity of the first pipe section, the inner cavity of the second pipe section and the connecting hole 1c together constitute the flushing liquid channel of the connector 1;

[0030] The annulus 4 is connected to the inner cavity of the second pipe section through the connecting hole 1c. The upper end of the first pipe section is provided with an internal thread, which can be threadedly connected with a pipe string or a drill pipe.

[0031] The connector 1 is threadedly connected to the upper end of the outer tube 2 via a thread 1a provided on the first pipe section, and is threadedly connected to the upper end of the cylindrical shell 9 via a second thread 1b provided on the second pipe section.

[0032] As shown in FIG3 , the outer side of the annular nozzle 8 is provided with an external thread throughout the entire section; the lower end of the outer tube 2 is provided with an internal thread, the annular nozzle 8 is threadedly connected to the lower end of the outer tube 2, and the inner side of the annular nozzle 8 abuts against the outer wall of the cylindrical shell 9. In other embodiments of the utility model, the annular nozzle 8 can also be integrated with the outer tube 2.

[0033] The outer side of the lower end surface of the annular flushing head 8 is provided with a chamfer, and the annular nozzle head 8 is circumferentially evenly distributed with a plurality of first through holes extending in a straight line and penetrating the upper and lower end surfaces of the annular nozzle head 8, and a first spray hole 8a penetrating the first through hole and the inner side of the annular flushing head. The first through hole located between the first spray hole and the upper end surface of the annular nozzle serves as a flow channel 8c and together with the first spray hole 8a constitutes a first injection channel, and the first through hole located between the first spray hole and the lower end surface of the annular nozzle serves as a second spray hole 8b, and the first through hole as a whole forms a second injection channel.

[0034] The extension direction of the second spray hole 8b is the same as that of the outer tube 2, so the object to be recorded can be rinsed well; the connection position between the first spray hole 8a and the second spray hole 8b is lower than the lowest point of the hemispherical protective cover 7c, and the first spray hole 8a extends in a straight line from the connection position with the second spray hole 8b to the hemispherical protective cover 7c. In other embodiments of the utility model, in order to simplify the structure, only one second spray hole 8b can be set on the annular nozzle 8. Of course, the connection position between the first spray hole 8a and the second spray hole 8b can also be higher than the lowest point of the hemispherical protective cover 7c.

[0035] Before using the downhole television imaging device of this embodiment for testing, in order to save power, according to the time when the downhole television imaging device reaches the target layer or the top of the fish, the control program in the data storage control module 6 is set through the ground equipment to set the instrument start working time so that the downhole television imaging device starts working when it reaches the top of the fish, and then the upper end of the storage downhole television instrument 3 is connected to the second thread 1b of the connector 1, and then the upper end of the outer tube 2 is connected to the first thread 1a of the lower end of the connector 1, and the lower end of the outer tube 2 is connected to the annular nozzle 8.

[0036] During the test, the upper end of the connector 1 of the downhole TV imaging device is connected to the oil pipe or drill pipe, and the downhole TV imaging device is transported to the target layer section to be tested in the wellbore or above the fish drop. The oil pipe or drill pipe is pressurized and water is injected into the oil pipe or drill pipe by a ground pump truck. The water flows into the annulus 4 through the connecting hole 1c of the connector 1, and then flows through the flow channel 8c of the annular nozzle 8 and is ejected through the first ejection hole 8a and the second ejection hole 8b, so as to realize the function of circulating well washing and flushing the hemispherical protective cover 7c. After the well washing is completed, the pump truck stops injecting water, and the storage-type downhole TV instrument 3 starts to record the video and store the data of the downhole situation after the start-up working time set on the ground is reached. After the stop point test is completed, the pipe string can also be slowly and uniformly lifted to realize the continuous video image recording of the target well section. In order to ensure the test quality, the test well section can be flushed and tested repeatedly for multiple times. After the test is completed, the downhole TV imaging device of the utility model is lifted out of the wellhead, and the video data is read out from the data storage control module 6 by a special ground equipment for playback interpretation.

[0037] Example 2

[0038] The downhole TV imaging device of this embodiment is different from the TV imaging device of embodiment 1 only in that in this embodiment, only the first injection channel is provided on the annular nozzle, and no second injection hole is provided, so that the injection pressure of the flushing liquid can be higher, thereby better cleaning the camera.

Claims

1. A downhole television imaging device, comprising a downhole television instrument, wherein the downhole television instrument comprises a housing and a camera module arranged in the housing, characterized in that: The downhole television imaging device also includes an outer tube arranged outside the downhole television, a nozzle connected to the bottom of the outer tube, and a connector connected to the shell and the outer tube for connecting to a pipe string or a drill pipe. An annulus is provided between the outer tube and the shell to form a flushing fluid channel, and the connector is provided with a flushing fluid channel for draining the flushing fluid entering the connector to the annulus; the nozzle is provided with a first injection channel connected to the annulus for injecting flushing fluid toward the camera module.

2. The downhole television imaging device according to claim 1, characterized in that: The spray head also includes a second spray channel communicated with the annulus and used for spraying flushing liquid downward along the extension direction of the outer cylinder.

3. The downhole television imaging device according to claim 2, characterized in that: The nozzle is annular, the first injection channel includes a flow hole connected to the annulus and a first ejection hole connected to the flow hole, and the first ejection hole extends from the flow hole to the inside of the nozzle; The second injection channel includes a flow hole shared with the first injection channel and a second ejection hole communicated with the flow hole.

4. The downhole television imaging device according to claim 3, characterized in that: A plurality of first injection channels are provided, and the flow holes of each first injection channel are evenly arranged in the circumferential direction of the nozzle.

5. The downhole television imaging device according to claim 3 or 4, characterized in that: The downhole television also includes a hemispherical protective cover for protecting the camera module; the hemispherical protective cover is sealed and fixedly connected to the lower end of the shell of the downhole television.

6. The downhole television imaging device according to claim 5, characterized in that: The communication position between the first ejection hole and the flow hole is lower than the lowest point of the hemispherical protective cover, and the first ejection hole extends in a straight line from the communication position with the flow hole to the hemispherical protective cover.

7. The downhole television imaging device according to claim 3 or 4, characterized in that: The outer side of the nozzle is provided with an external thread; the nozzle is threadably connected with the outer cylinder through the external thread, and the inner side of the nozzle is in contact with the shell of the downhole television.

8. The downhole television imaging device according to any one of claims 1 to 4, characterized in that: The connector includes a first pipe segment and a second pipe segment connected below the first pipe segment, the lumen of the second pipe segment is connected to the lumen of the first pipe segment, the first pipe segment is threadedly connected to the outer tube, the second pipe segment is threadedly connected to the shell, and the second pipe segment is provided with a connecting hole for connecting the lumen of the second pipe segment and the annulus.

9. The downhole television imaging device according to claim 8, characterized in that: The upper end of the first pipe section is provided with an internal thread, and the connector is connected to the oil pipe or the drill pipe through the internal thread.

10. The downhole television imaging device according to any one of claims 1 to 4, characterized in that: The downhole television also includes a data storage control module arranged in the housing for controlling the operation of the optical camera module and storing data, and a battery module for supplying power to the optical camera module and the data storage control module.

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