A smart monitoring device for downhole casing rotation and reverse connection

Abstract

A downhole casing rotation and reverse-clamping intelligent monitoring device includes a surface casing, several oil layer casings, oil layer casing couplings, drill pipe, a reverse-clamping monitoring device, and a wellhead signal receiving and processing device. The oil layer casings are located inside the surface casings and connected to each other via oil layer casing couplings. The drill pipe is located inside the oil layer casings, and reverse-clamping operations are performed via the drill pipe. The reverse-clamping monitoring device is located at the top of the oil layer casings and is connected to the wellhead signal receiving and processing device. The reverse-clamping monitoring device has a central tube providing a channel. It also includes an electronic section connected to the central tube via threads. The electronic section contains encapsulated electronic circuitry that collects and processes rotation signals and transmits them to the wellhead signal receiving and processing device in the form of ultrasonic signals. This invention can count whether the downhole oil layer casing is rotating and the number of rotations, displaying the information in real time to facilitate the smooth progress of reverse-clamping operations.

Description

Technical Field

[0001] This invention belongs to the field of oil well workover technology, specifically relating to an intelligent monitoring device for downhole casing rotation and reverse connection. Background Technology

[0002] In the middle and late stages of oil and gas field development, casing deformation and damage are very common in oil wells due to long-term exposure to formation pressure. Figure 2 As shown, casing damage causes crossflow between different layers, directly affecting the normal operation and production of oil and water wells. In severe cases, it can lead to well shutdown or even abandonment, resulting in significant economic losses. Because casing replacement technology can completely and thoroughly repair the casing, this technology is used in oil fields.

[0003] When replacing casing using the conventional reverse threading method, it is necessary to first remove the cement ring on the outside of the oil layer casing (if a cement ring exists) by milling, then use a reverse threading auger to catch it and directly reverse thread it. Using this method often results in the actual replacement depth not equal to the designed reverse threading depth, because the loosened thread of the oil layer casing may not be the thread at the designed depth (e.g., ...). Figure 3 (This means that it is impossible to determine which button is upside down.)

[0004] The correct procedure is to use a fixed-point casing replacement device for fixed-point reverse turning, turning out the oil layer casing in several sections until the casing reaches the designed depth. The fixed-point reverse turning device is lowered into the oil layer casing, and its construction structure is shown in the figure (e.g.) Figure 4 ).

[0005] Problem: During fixed-point reverse coupling, only when the upper oil layer casing rotates can it be confirmed that the oil layer casing has been reversed by the reverse coupling device. However, the oil layer casing inside the well is not visible at the wellhead (e.g., ...). Figure 4 We don't know if it's rotating or not. There are no monitoring methods available on site.

[0006] General approach: trial and error. We use a fixed-point reverser to rotate the threads (this rotation may be a false rotation, because the reverser may slip and not be anchored, causing the drill pipe to rotate while the casing does not). If the casing thread is found to be loose, we repeat the process of lowering the fixed-point reverser to reverse the threads.

[0007] Due to the lack of on-site monitoring methods for the casing within the well, conventional handling methods require multiple trips of the tubing string, wasting operation time and increasing costs. Therefore, there is an urgent need for a device capable of real-time monitoring of the casing rotation to assist in point-to-point reverse-running operations. Summary of the Invention

[0008] To address the aforementioned problems, this invention proposes an intelligent monitoring device for downhole casing rotation and reverse connection, comprising a surface casing, several oil layer casings, oil layer casing couplings, drill pipe, a reverse connection monitoring device, and a wellhead signal receiving and processing device. The oil layer casings are disposed inside the surface casing, and the several oil layer casings are connected by oil layer casing couplings. The drill pipe, used to complete the reverse connection operation, is disposed inside the oil layer casings and extends to the outside of the surface casing. The reverse connection monitoring device is disposed at the top of the oil layer casings and is connected to the wellhead signal receiving and processing device.

[0009] Furthermore, the internal configuration of the inverted monitoring device is used to provide a central tube for the channel.

[0010] Furthermore, the reverse-clamp monitoring device also includes an electronic section for collecting and processing rotation signals. The electronic section is connected to the central tube via a threaded connection. The electronic section contains encapsulated electronic circuitry and transmits signals to the wellhead signal receiving and processing device in the form of ultrasonic signals.

[0011] Furthermore, the inverted monitoring device also includes an adjusting cap, which is connected to the central tube by a thread, and several support seats are evenly fixed to the outer wall of the central tube in a circumferential manner.

[0012] Furthermore, the reverse buckling monitoring device also includes several support frames, which are respectively mounted on corresponding support seats. Two support frames are connected by a Hall sensor, which is connected to the inner wall of the oil layer casing.

[0013] Furthermore, the connecting cap is connected to the central tube via threads.

[0014] Furthermore, the inverted detection device also includes a compression spring that provides elasticity, with the upper and lower end faces of the compression spring acting on the support base.

[0015] Furthermore, a spring sheath is provided on the outer periphery of the compression spring.

[0016] Furthermore, the backlash monitoring device is inserted into the top of the oil layer casing by a friction claw that provides circumferential friction.

[0017] Furthermore, the diameter of the oil layer casing is 7 inches.

[0018] Furthermore, the length of the oil layer casing is 11 meters.

[0019] Furthermore, the wellhead signal receiving and processing device includes an instrument body, the internal circuit of which includes a power module, an ultrasonic signal receiving module, a microcontroller module for processing the collected data, a button module for transmitting button action signals to the microcontroller, and a screen module for displaying counting information in real time. The microcontroller module is connected to the power module, the ultrasonic signal receiving module, the button module, and the screen module, respectively.

[0020] Furthermore, the ultrasonic signal receiving module converts the acquired ultrasonic signal into an electronic signal, performs preliminary hardware filtering, shaping, and amplification on the electronic signal, and then transmits the processed signal to the microcontroller module via a data line.

[0021] Furthermore, the instrument body also includes a power button, a reset button, a pause button, and a display screen. The display screen is disposed on the surface of the upper half of the instrument body, and the power button, reset button, and pause button are disposed below the display screen in sequence.

[0022] The beneficial effects of this invention are as follows: This invention can display to the user in real time whether the downhole casing is rotating and the number of rotations. This saves operation time and reduces operation costs. It can also be used to assist in fixed-point reverse-threading operations. Attached Figure Description

[0023] Figure 1 This is a half-sectional view of the inverted buckle monitoring device of the present invention;

[0024] Figure 2 This is a diagram of the wellbore structure of an oil-water well after casing damage, as per the present invention.

[0025] Figure 3 This is a diagram of the well shaft structure with multiple inverted sections according to the present invention;

[0026] Figure 4 This is a diagram of the well shaft structure of the fixed-point reverse clamp of the present invention;

[0027] Figure 5 This is a wellbore structure diagram of the intelligent monitoring device for downhole casing rotation and reverse buckling according to the present invention;

[0028] Figure 6 This is a circuit diagram of the wellhead end device of the present invention;

[0029] Figure 7 This is a schematic diagram of the wellhead signal receiving and processing device of the present invention;

[0030] Figure 8 This is a partially enlarged structural diagram of the inverted buckle monitoring device of the present invention.

[0031] The attached diagrams are labeled as follows: 1. Surface casing; 2. Oil layer casing; 3. Oil layer casing coupling; 4. Drill pipe; 5. Backlash monitoring device; 7. Instrument body; 11. Power button; 12. Reset button; 13. Pause button; 14. Display screen; 51. Electronic joint; 52. Adjustment cap; 53. Support base; 54. Support frame; 55. Hall sensor; 56. Compression spring; 57. Central tube; 58. Connecting cap; 59. Friction gripper. Detailed Implementation

[0032] Example 1

[0033] This invention relates to an intelligent monitoring device for downhole casing rotation and reversal. For example... Figure 1 and Figure 8 As shown, the system includes a surface casing 1, several oil layer casings 2, oil layer casing couplings 3, drill pipe 4, a backlash monitoring device 5, and a wellhead signal receiving and processing device. The oil layer casings 2 are located inside the surface casing 1. The several oil layer casings 2 are connected to each other by oil layer casing couplings 3. The drill pipe 4, after the backlash operation is completed, is located inside the oil layer casings 2. The backlash monitoring device 5 is located at the top of the oil layer casings 2 and is connected to the wellhead signal receiving and processing device.

[0034] The internal structure of the inverted monitoring device 5 is configured to provide a central tube 57 for the channel.

[0035] The reverse monitoring device 5 also includes an electronic section 51 for collecting and processing rotation signals. The electronic section 51 is connected to the central tube 57 by a thread. The electronic section 51 encapsulates electronic circuits and transmits signals to the wellhead signal receiving and processing device in the form of ultrasonic signals.

[0036] The inverted monitoring device 5 also includes an adjusting cap 52, which is connected to the central tube 57 by a thread. The thread adjusts the squeezing pressure on the support seat 53. Several support seats 53 are evenly fixed to the outer wall of the central tube 57 in a circumferential manner.

[0037] The backlash monitoring device 5 further includes several support frames 54, which are respectively mounted on corresponding support seats 53. Two support frames 53 are connected by a Hall sensor 55, which is connected to the inner wall of the oil layer casing 2.

[0038] The connecting cap 58 is connected to the central tube 57 by threads.

[0039] The inverted detection device 5 also includes a compression spring 56 that provides elasticity, with the upper and lower end faces of the compression spring 56 acting on the support base 53.

[0040] The compression spring 56 is provided with a spring sleeve on its outer periphery.

[0041] The backlash monitoring device 5 is inserted into the top of the oil layer casing 2 by a friction claw 59 that provides circumferential friction.

[0042] The diameter of the oil layer casing 2 is 7 inches.

[0043] The length of the oil layer casing 2 is 11 meters.

[0044] Among them, such as Figure 6 As shown, the wellhead signal receiving and processing device includes an instrument body 7. The internal circuit of the instrument body 7 includes a power supply module, an ultrasonic signal receiving module, a microcontroller module for processing the collected data, a button module for transmitting button action signals to the microcontroller, and a screen module for displaying counting information in real time. The microcontroller module is connected to the power supply module, the ultrasonic signal receiving module, the button module, and the screen module, respectively.

[0045] The ultrasonic signal receiving module converts the acquired ultrasonic signal into an electronic signal, performs preliminary hardware filtering, shaping, and amplification on the electronic signal, and then transmits the processed signal to the microcontroller module via a data line.

[0046] Power module: Responsible for power management, using a 9V rechargeable battery.

[0047] Ultrasonic signal receiving module: This module is installed at the end of the tubing column. It can convert the acquired ultrasonic signals into electronic signals, and perform preliminary hardware filtering, shaping and amplification on the electronic signals. The processed signals are then transmitted to the microcontroller module via a data cable.

[0048] Microcontroller module: The brain of the circuit, which performs calculations and other tasks on the collected data.

[0049] Button module: Collects the button's action signal and then transmits it to the microcontroller.

[0050] Screen module: Displays counting information in real time for easy viewing by personnel.

[0051] Among them, such as Figure 7 As shown, the instrument body 7 also includes a power button 11, a reset button 12, a pause button 13, and a display screen 14. The display screen 14 is disposed on the surface of the upper half of the instrument body 1, and the power button 11, the reset button 12, and the pause button 13 are disposed below the display screen 14.

[0052] The power button switches the device on and off; the reset button clears the counter and restarts the count; the pause button pauses the count.

[0053] The specific implementation method of this embodiment is as follows:

[0054] according to Figure 1 The structure involves lowering the intelligent monitoring device into the surface casing. This device is fixed to the top of the oil layer casing by friction claws. Then, the fixed-point buckling device is lowered in and, through the central channel of the device, the buckling device is lowered to the coupling position of the oil layer casing that needs to be buckled.

[0055] At the wellhead, rotating the drill pipe clockwise (positive direction) initiates the reverse-running mechanism. If the casing in the oil layer is reversed, this device will rotate accordingly. The Hall sensor contacts and rubs against the surface casing, triggering an electrical signal pulse. After the electronic section acquires the signal, it emits an ultrasonic signal, which propagates to the signal receiving device at the wellhead. The ultrasonic signal is received, processed, and displayed by the receiving device at the wellhead. Based on the display result, it determines whether the casing in the oil layer has rotated, thus assisting in the reverse-running operation.

[0056] The principle of this invention is as follows: The intelligent monitoring device is lowered into the surface casing, and the invention is fixed to the top of the oil layer casing by friction claws; the fixed-point buckling device is lowered from the central tube to the oil layer casing position where buckling is required (see appendix). Figure 5 When the drill pipe is rotated clockwise (positive direction) at the wellhead, the reverser starts working, twisting the upper oil casing in the opposite direction. If the oil casing is reversed, the device of this invention will rotate along with the oil casing. The Hall sensor in contact with the surface casing is then triggered. The electronic unit collects and processes the rotation signal of the oil casing and emits it as an ultrasonic signal. The ultrasonic signal travels through the surface casing to the receiving probe at the wellhead, which then transmits the signal to the wellhead signal receiving and processing device.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A smart monitoring device for downhole casing rotation and reversal, characterized in that, The device includes a surface casing (1), several oil layer casings (2), oil layer casing couplings (3), drill pipe (4), a backlash monitoring device (5), and a wellhead signal receiving and processing device. The oil layer casings (2) are located inside the surface casing (1), and the several oil layer casings (2) are connected by oil layer casing couplings (3). The drill pipe (4), which is used to complete the backlash operation, is located inside the oil layer casings (2) and extends to the outside of the surface casing (1). The backlash monitoring device (5) is located at the top of the oil layer casings (2) and is connected to the wellhead signal receiving and processing device. The internal arrangement of the inverted monitoring device (5) is used to provide a central tube (57) for the channel; The reverse monitoring device (5) also includes an electronic section (51) for collecting and processing rotation signals. The electronic section (51) is connected to the central tube (57) by a thread. The electronic section (51) is encapsulated with electronic circuits and transmits signals to the wellhead signal receiving and processing device in the form of ultrasonic signals. The inverted monitoring device (5) also includes an adjustment cap (52), which is connected to the central tube (57) by a thread, and several support seats (53) are evenly fixed to the outer wall of the central tube (57) in a circumferential direction; The backlash monitoring device (5) also includes several support frames (54), which are respectively set on corresponding support seats (53). The two support seats (53) are connected by a Hall sensor (55), which is connected to the inner wall of the oil layer casing (2). The connecting cap (58) is connected to the central tube (57) by threads; The undercut monitoring device (5) also includes a compression spring (56) that provides elasticity, with the upper and lower end faces of the compression spring (56) acting on the support base (53).

2. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 1, characterized in that, A spring sheath is provided on the outer periphery of the compression spring (56).

3. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 2, characterized in that, The backlash monitoring device (5) is inserted into the top of the oil layer casing (2) by a friction claw (59) that provides circumferential friction.

4. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 1, characterized in that, The diameter of the oil layer casing (2) is 7 inches.

5. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 1, characterized in that, The length of the oil layer casing (2) is 11 meters.

6. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 1, characterized in that, The wellhead signal receiving and processing device includes an instrument body (7). The internal circuit of the instrument body (7) includes a power supply module, an ultrasonic signal receiving module, a microcontroller module for processing the collected data information, a button module for transmitting button action signals to the microcontroller, and a screen module for displaying counting information in real time. The microcontroller module is connected to the power supply module, the ultrasonic signal receiving module, the button module, and the screen module, respectively.

7. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 6, characterized in that, The ultrasonic signal receiving module converts the acquired ultrasonic signal into an electronic signal, performs preliminary hardware filtering, shaping, and amplification on the electronic signal, and then transmits the processed signal to the microcontroller module via a data line.

8. The intelligent monitoring device for downhole casing rotation and reverse connection as described in claim 6, characterized in that, The instrument body (7) also includes a power button (11), a reset button (12), a pause button (13) and a display screen (14). The display screen (14) is located on the surface of the upper half of the instrument body (7), and the power button (11), reset button (12) and pause button (13) are located below the display screen (14) in sequence.

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