Corrosion condition evaluation device and method for horizontal well shaft

Abstract

The invention discloses a corrosion condition evaluation device and method for a horizontal well shaft, the corrosion condition evaluation device comprises a controller, a crawler, a video shooting device and a well logging device, the video shooting device and the well logging device are both installed on the crawler, and the controller is at least used for controlling the crawler to drive the video shooting device and the well logging device to move. And evaluating the corrosion condition of the target horizontal well shaft according to the wall surface video data and the wall surface detection data. According to the device and method for evaluating the corrosion condition of the horizontal well shaft, the video shooting device and the logging device are combined to form a set of combined detection equipment, and the combined detection equipment is connected with the crawler, so that synchronous and integrated descending is achieved when the horizontal well descends, and the horizontal well shaft can be rapidly and accurately evaluated along with the movement of the crawler to the designated position of the horizontal well. The video shooting device and the logging device can start detection and end detection at the same time, synchronism is high, the video shooting device and the logging device are combined, detection data are richer and more stereoscopic, and detection results are more accurate.

Description

Technical Field

[0001] This invention relates to the field of oil production engineering technology, specifically to a device and method for assessing the corrosion status of horizontal wellbore. Background Technology

[0002] During oil and gas field development, corrosion and damage to casing can occur due to formation fluid production, acidizing, fracturing, and other operations, disrupting or even halting normal production of oil and water wells. Therefore, once casing damage occurs, timely and effective remediation is necessary. Effective remediation requires understanding the specific circumstances of the casing damage and the main reasons affecting production.

[0003] Currently, commonly used casing damage detection technologies mainly include lead mold printing, double-seal leak detection, MIT+MTT (Mixed Detection and Testing + Mulch-Touch), and downhole visualization. Lead mold printing is mainly used for casing deformation detection and is not suitable for casing leak detection. Double-seal leak detection technology has high requirements for the casing inner wall setting environment; if the packer is not properly set, it can easily lead to false detections. MIT and MTT are relatively mature in downhole applications. MIT+MTT casing damage detection technology can detect casing wall thickness and corrosion perforation, but it cannot determine whether there is water seepage at the casing rupture point. Although downhole television can observe and determine the casing water seepage point, it... The corrosion and perforation of the casing cannot be clearly observed. In addition, some casing walls have corrosion and scaling problems, making it impossible to judge the overall corrosion status of the casing. At the same time, the current downhole video images are mainly viewed manually. Due to the complexity of downhole conditions, the development of automated video analysis software is relatively expensive. Furthermore, due to the high detection cost, the amount of data available for training is limited. Therefore, the accuracy of direct analysis using video data in a short period of time is also low, which cannot provide accurate and comprehensive wellbore information for the formulation of targeted long-term treatment plans for casing corrosion prevention. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a device and method for assessing the corrosion status of horizontal wellbore, thus solving the aforementioned problems.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a corrosion assessment device for horizontal wellbore, comprising a controller, a crawler, a video recording device, and a logging device, wherein the video recording device and the logging device are both mounted on the crawler; The controller is at least used to control the crawler to drive the video shooting equipment and logging equipment, and to assess the corrosion status of the target horizontal wellbore based on wall video data and wall detection data; The crawler is used to drive the video shooting equipment and logging equipment to move in the well; The video capture device is used to capture and obtain video data of the wall surface of the target horizontal well shaft; The logging tool is used to detect and obtain wall detection data of the target horizontal wellbore through sensors.

[0006] Preferably, the device further includes a power supply and a logging cable, the logging cable being electrically connected to the crawler, the video recording device, the logging instrument, and the power supply.

[0007] Preferably, the connection between the controller and the crawler, the video recording device, and the logging device is configured as a wired cable connection or a wireless communication connection.

[0008] Preferably, the video shooting device can be an underground CCD camera, an underground video recorder, or an underground camera.

[0009] Preferably, the logging instrument can be a resistivity logging instrument, an acoustic logging instrument, a nuclear logging instrument, or a circumferential resistivity logging instrument. The resistivity logging instrument is used to measure the resistivity or conductivity of the formation, thereby determining the lithology, water saturation, and porosity of the formation. The acoustic logging instrument is used to measure the propagation speed and attenuation characteristics of sound waves in the formation. By measuring the sound wave speed and attenuation in the formation, the elastic modulus, Poisson's ratio, lithology type, and fracture characteristics of the formation can be inferred. The nuclear logging instrument uses radioactive isotope rays or neutron beams to measure the radioactive reaction and neutron scattering in the formation. The circumferential resistivity logging instrument is used to measure the resistivity change of the formation along the wellbore direction to detect fractures, rock conductivity, and reservoir connectivity characteristics.

[0010] Preferably, the logging tool includes a magnetic wall thickness logging tool and a contact multi-arm caliper imaging logging tool.

[0011] Preferably, the crawler and the controller are connected via a logging cable, and the diameter of the logging cable is greater than 20 mm.

[0012] Preferably, the device further includes coiled tubing, the logging cable is located in the coiled tubing, and the logging cable is pre-installed and integrally manufactured with the coiled tubing.

[0013] A method for assessing the corrosion status of a horizontal wellbore, comprising the following steps: S100. Lower the crawler, video recording equipment, and logging equipment into the target horizontal well. S200, the controller controls the crawler to move the video shooting equipment and logging equipment in the target horizontal well, and obtain wall video data and wall detection data; The S300 controller assesses the corrosion status of the target horizontal wellbore based on wall video data and wall detection data. Preferably, the corrosion types in step S300 include perforation corrosion, ring corrosion, linear corrosion, flaking corrosion, and spot corrosion.

[0014] This invention provides a device and method for assessing the corrosion status of horizontal wellbore. Compared with existing technologies, it has the following advantages: The device and method for assessing the corrosion status of horizontal wellbore combines video recording equipment and logging equipment into a single integrated detection device. This device is connected to a crawler, enabling synchronous and integrated deployment during the horizontal well run-in process. As the crawler moves to the designated position in the horizontal well, the video recording equipment and logging equipment can start and stop detection simultaneously, resulting in high synchronization. The combination of video recording equipment and logging equipment provides richer and more comprehensive detection data, leading to more accurate detection results. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the method flow of the present invention.

[0016] In the diagram: 100, controller; 200, crawler; 300, video recording equipment; 400, logging device. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention have been clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1, please refer to Figure 1This invention provides a technical solution: a corrosion assessment device for horizontal wellbore, comprising a controller 100, a crawler 200, a video recording device 300, and a logging device 400. The video recording device 300 and the logging device 400 are both mounted on the crawler 200. The device also includes a power supply and a logging cable. The logging cable is electrically connected to the crawler 200, the video recording device 300, the logging device 400, and the power supply. The surface power supply provides power to the crawler 200, the video recording device 300, and the logging device 400 via the logging cable. The logging cable power supply provides continuous and durable power, offering higher power output, and is suitable for downhole equipment or tasks requiring high energy consumption, without being limited by the lifespan or power consumption of the built-in battery. The horizontal well downhole equipment can operate continuously during long-term missions without frequent battery replacements or work interruptions. The connection between the controller 100, the crawler 200, the video capture device 300, and the logging device 400 is set as a wired cable connection, which can achieve better information transmission. By combining the video capture device 300 and the logging device 400, a combined detection device is formed and connected to the crawler 200, realizing synchronous integrated entry during horizontal well downhole. As the crawler 200 moves to the designated position in the horizontal well, the video capture device 300 and the logging device 400 can start and stop detection simultaneously, with high synchronization. The combination of the two detection methods of the video capture device 300 and the logging device 400 provides richer and more comprehensive detection data and more accurate detection results.

[0019] The controller 100 is used at least to control the crawler 200 to drive the video capturing device 300 and the logging device 400, and to evaluate the corrosion status of the target horizontal wellbore based on wall video data and wall detection data. The controller 100 can be connected to any one or more of the crawler 200, video capturing device 300, and logging device 400, and can use a single bus to transmit signals. During logging, the controller 100 controls the crawler 200 and the video capturing device 300 and logging device 400 on the crawler 200 separately to achieve more precise control. At the same time, the controller 100 receives wall video data and wall detection data through the bus and evaluates the corrosion status of the target horizontal wellbore based on the wall video data and wall detection data. Controlling multiple devices with one controller 100 reduces the number of ground equipment and operators, facilitates unified control operation, and improves the accuracy of testing.

[0020] The crawler 200 is used to move the video capture device 300 and the logging tool 400 within the well. The crawler 200 communicates with the controller 100 via a logging cable with a diameter greater than 20mm. By combining the power supply cable and data communication cable into a single logging cable, wiring complexity is reduced, space is saved, costs are lowered, and cable installation and maintenance are simplified. This also reduces the number of connection points and joints between cables, lowering the likelihood of failures and improving system reliability. Higher cable integration and a single-cable design reduce electromagnetic interference, providing better shielding performance and signal integrity, thereby improving system stability and anti-interference capabilities. Using a larger diameter logging cable supports high-bandwidth data transmission, enabling fast, real-time communication between the crawler 200 and the controller 100, transmitting large amounts of data such as wall video data and wall detection data. Furthermore, the larger diameter logging cable offers better mechanical strength and durability, providing a reliable physical connection and ensuring the safe and stable operation of the crawler 200, especially in harsh horizontal well environments or complex terrain.

[0021] The video shooting device 300 is used to capture and obtain video data of the wall surface of the target horizontal well. The video shooting device 300 can be a downhole CCD camera, a downhole camera, or a downhole camera, which can ensure the downhole shooting effect and has the characteristics of high definition, high frame rate, high pressure resistance, and high temperature resistance.

[0022] The logging tool 400 is used to detect and obtain wall detection data of the target horizontal wellbore through sensors. The logging tool 400 can employ resistivity logging instruments, sonic logging instruments, nuclear logging instruments, or circumferential resistivity logging instruments. Resistivity logging instruments are used to measure the resistivity or conductivity of the formation, thereby determining the lithology, water saturation, and porosity of the formation. Sonic logging instruments are used to measure the propagation speed and attenuation characteristics of sound waves in the formation. By measuring the sound wave speed and attenuation in the formation, the elastic modulus, Poisson's ratio, lithology type, and fracture characteristics of the formation can be inferred. Nuclear logging instruments use radioactive isotope rays or neutron beams to measure radioactive reactions and neutron scattering in the formation. Circumferential resistivity logging instruments are used to measure the resistivity change of the formation along the wellbore direction to detect characteristics such as fractures, rock conductivity, and reservoir connectivity.

[0023] The logging tool 400 includes a magnetic wall thickness logging tool and a contact multi-arm caliper imaging logging tool. The magnetic wall thickness logging tool is a logging instrument used to measure the wall thickness of pipes or containers. It utilizes the principle of magnetic field induction, inferring the wall thickness of the pipe or container by measuring changes in the magnetic field. This logging instrument typically contains one or more magnetic field sensors, measuring through contact or non-contact methods with the surface of the pipe or container. The contact multi-arm caliper imaging logging tool is a logging instrument used to measure the inner diameter and surface morphology of a wellbore. It typically consists of multiple retractable arms, each equipped with a measuring head. By maintaining contact with the inner wall of the wellbore and extending and rotating the arm, the logging instrument can scan the surface morphology of the inner wall of the wellbore, obtaining information on changes in the inner diameter of the wellbore and any anomalies. By using these two logging instruments, the magnetic wall thickness logging tool provides rapid and accurate results for corrosion detection and wall thickness assessment of pipelines or containers, while the contact multi-arm caliper imaging logging tool can be used to assess the integrity and structure of the wellbore, helping to optimize well workover and maintenance. These two logging instruments can improve work efficiency, reduce maintenance costs, and further improve the accuracy of assessments.

[0024] Example 2 differs from Example 1 in that the connection between the controller 100 and the crawler 200, the video shooting device 300 and the logging device 400 is set to a wireless communication connection. The wireless communication connection can facilitate information transmission and reduce costs.

[0025] Example 3: The device also includes coiled tubing, with the logging cable located within it. The logging cable is pre-installed and integrally manufactured with the coiled tubing. By pre-installing the logging cable and coiled tubing during production, the logging cable can be completed on the production line, avoiding the time and cost of on-site assembly and connection, improving assembly efficiency, reducing production costs, and minimizing the uncertainty and error rate of manual operation. The logging cable can undergo quality control and testing on the production line to ensure its connection and performance meet requirements, avoiding potential safety hazards and quality problems associated with on-site assembly. Furthermore, the integrated structural design of the logging cable reduces connection points and joints, improving its reliability and lifespan. The logging cable can also be designed and manufactured according to specific application requirements, meeting different environmental and working condition needs. For example, in a horizontal well corrosion assessment device, different logging cable thicknesses and voltage ranges, as well as special materials and anti-corrosion measures, can be pre-selected based on well depth and transmission distance requirements to adapt to different needs, thus broadening its applicability.

[0026] Example 4, please refer to Figure 2 A method for assessing the corrosion status of a horizontal wellbore, comprising the following steps: S100, Lower the crawler 200, video recording equipment 300 and logging device 400 into the target horizontal well; S200 and controller 100 control crawler 200 to drive video shooting equipment 300 and logging device 400 to move in the target horizontal well and obtain wall video data and wall detection data; S300 and controller 100 assess the corrosion status of the target horizontal wellbore based on wall video data and wall detection data. The corrosion status types in step S300 include perforation corrosion, annular corrosion, linear corrosion, flaking corrosion, and spot corrosion.

[0027] First, the crawler 200, video recording device 300, and logging device 400 are lowered into the target horizontal well. Then, the controller 100 controls the crawler 200 to move the video recording device 300 and logging device 400 within the target horizontal well, acquiring wall surface video data and wall surface inspection data. Finally, the controller 100 assesses the corrosion status of the target horizontal well casing based on the wall surface video data and wall surface inspection data. The controller 100 controls the crawler 200 to move the video recording device 300 and logging device 400 within the target horizontal well, acquiring wall surface video data captured by the video recording device 300 and wall surface inspection data detected by the logging device 400 through sensors. The video recording device 300 and logging device 400 are combined to form a combined inspection device, which is integrated with the crawler 200. With zero connection, as the crawler 200 moves to the designated position in the horizontal well, the video recording device 300 and the logging device 400 can start and stop detection simultaneously, achieving high synchronization. The combination of the two detection methods—video recording device 300 and logging device 400—provides richer and more comprehensive detection data, resulting in more accurate detection results. The controller 100 evaluates the corrosion status of the target horizontal well casing based on the wall video data and wall detection data. Different corrosion conditions present different characteristics in the wall video data and wall detection data. By analyzing the wall video data and wall detection data of the target horizontal well casing, the controller 100 evaluates the corrosion status of the target horizontal well casing. For example, it can classify the horizontal well casing according to the corrosion type; classify the horizontal well casing according to the corrosion depth; and calculate the horizontal well casing according to the corrosion area, etc.

[0028] To accurately locate areas of non-minor corrosion for subsequent targeted treatment, the controller 100 also generates crawling data to record the movement speed and crawling time of the crawler 200. Correspondingly, the controller 100 assesses the corrosion status of the target horizontal wellbore based on wall video data and wall detection data. This includes: determining the location of areas of non-minor corrosion in the target horizontal wellbore based on the wall video data, wall detection data, and crawling data; evaluating the areas of the target horizontal wellbore using the wall video data and wall detection data, categorizing them as slightly corroded or non-slightly corroded areas according to the degree of corrosion; and then calculating the location of the non-slightly corroded areas within the horizontal wellbore using the crawler 200's movement speed and crawling time from the crawling data, facilitating subsequent targeted treatment.

[0029] To more accurately identify areas of non-minor corrosion within the horizontal wellbore, the wall video data was re-extracted and analyzed.

[0030] Based on wall video data, wall detection data, and crawling data, the controller 100 determines the locations of non-minor corrosion areas in the target horizontal well casing, including: a. The controller 100 determines the detection time corresponding to the area in the target horizontal well where there are abnormalities on the well wall based on the wall detection data and crawling data; b. The controller 100 extracts video segment sub-data from the wall video data based on the detection time corresponding to the area in the target horizontal well where there is anomaly on the well wall. c. The controller 100 determines, based on the video segment sub-data, whether the area in the target horizontal well where there is an anomaly on the well wall is an area with non-slight corrosion.

[0031] First, the controller 100 determines the detection time corresponding to the area with abnormal wellbore wall in the target horizontal well based on the wall detection data and crawling data. Then, based on the detection time corresponding to the area with abnormal wellbore wall in the target horizontal well, the controller 100 extracts video segment data from the wall video data. Finally, based on the video segment data, the controller 100 determines whether the area with abnormal wellbore wall in the target horizontal well is an area with non-minor corrosion. By searching for abnormal areas in the wall detection data detected by the logging device 400, the controller 100 can initially determine that the abnormal area is an area with corrosion on the wellbore wall in the target horizontal well. Then, based on the crawling data corresponding to the area, i.e., the detection time corresponding to the abnormal area, the controller searches for and extracts video segment data of the abnormal area from the wall video data captured by the video capturing device 300. Through the video segment data, the controller 100 can more accurately determine whether the area with abnormal wellbore wall in the target horizontal well is an area with non-minor corrosion. By first analyzing the wall detection data and then extracting wall video data based on the analysis results, the controller 100 fully... By leveraging the advantages and applicability of both the video capture device 300 and the logging tool 400, the video capture device 300 provides intuitive images of the wellbore wall. Its high resolution allows it to capture minute details and anomalies, enabling operators to directly observe and analyze the actual condition of the wellbore. These high-resolution images can reveal surface problems such as cracks, corrosion, and deposits. The high resolution also allows for more precise detection of corrosion and cracks. The logging tool 400 provides accurate measurement data, such as wall thickness and corrosion level. Through sensors and measurement technology, it acquires detailed information about the wellbore's interior and provides quantitative data results. The logging tool 400 can penetrate deep into the wellbore for non-destructive testing of the wellbore wall, detecting corrosion, wear, deformation, and other issues, providing crucial data support. By combining the advantages of both the video capture device 300 and the logging tool 400, a more comprehensive and accurate assessment of the horizontal wellbore's corrosion status can be obtained, improving the reliability and accuracy of the assessment and helping to identify and resolve wellbore corrosion problems early.

[0032] To facilitate more targeted treatment measures in the future, the corrosion status of the target horizontal wellbore is classified into multiple states.

[0033] The controller 100 assesses the corrosion status of the target horizontal wellbore based on wall video data and wall inspection data, including: The controller 100 assesses the corrosion type of areas with non-minor corrosion in the target horizontal wellbore based on wall video data and wall detection data, and obtains corrosion type assessment data. The corrosion type assessment data is used to characterize the areas with non-minor corrosion in the target horizontal wellbore as belonging to one of the following: perforation corrosion, annular corrosion, linear corrosion, sheet corrosion, and spot corrosion.

[0034] The specific criteria for identifying corrosion types are as follows:

[0035] By using corrosion type assessment data to determine the areas of the target horizontal wellbore with non-minor corrosion, the condition of these areas can be classified, facilitating more targeted treatment measures in the future.

[0036] To facilitate more targeted treatment measures in the future, the corrosion level of the target horizontal wellbore is classified into multiple states.

[0037] The controller 100 determines whether an area with abnormal wellbore wall surface in the target horizontal well is an area with non-minor corrosion based on video segment data. This includes: the controller 100 assesses the degree of corrosion in the area with abnormal wellbore wall surface in the target horizontal well based on video segment data and wall surface detection data, obtaining corrosion degree assessment data. The corrosion degree assessment data characterizes the area with abnormal wellbore wall surface in the target horizontal well as belonging to one of the following categories: minor corrosion, severe corrosion, and perforation corrosion. The specific criteria are as follows:

[0038] By using corrosion assessment data to identify abnormal areas on the wellbore wall in the target horizontal well, these abnormal areas can be classified, facilitating more targeted treatment measures in the future.

[0039] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for assessing the corrosion status of a horizontal wellbore, characterized in that: It includes a controller (100), a crawler (200), a video capturing device (300), and a logging device (400), wherein the video capturing device (300) and the logging device (400) are both mounted on the crawler (200); The controller (100) is at least used to control the crawler (200) to drive the video shooting device (300) and the logging device (400) to move, and to evaluate the corrosion status of the target horizontal wellbore based on the wall video data and wall detection data; The crawler (200) is used to drive the video shooting equipment (300) and the logging device (400) to move in the well; The video shooting device (300) is used to shoot and obtain video data of the wall surface of the target horizontal well shaft; The logging device (400) is used to detect and obtain wall detection data of the target horizontal wellbore through sensors.

2. The corrosion assessment device for horizontal wellbore according to claim 1, characterized in that: The device also includes a power supply and a logging cable, the logging cable being electrically connected to the crawler (200), the video recording device (300), the logging instrument (400) and the power supply.

3. The corrosion assessment device for horizontal wellbore according to claim 1, characterized in that: The connection between the controller (100), the crawler (200), the video shooting device (300), and the logging device (400) is configured as either a wired cable connection or a wireless communication connection.

4. The corrosion status assessment device for horizontal wellbore according to claim 1, characterized in that: The video shooting device (300) may be one of an underground CCD camera, an underground video camera, or an underground camera.

5. The corrosion assessment device for horizontal wellbore according to claim 1, characterized in that: The logging instrument (400) employs one of the following: resistivity logging instrument, sonic logging instrument, nuclear logging instrument, or circumferential resistivity logging instrument. The resistivity logging instrument is used to measure either the resistivity or conductivity of the formation, thereby determining the lithology, water saturation, and porosity of the formation. The sonic logging instrument is used to measure the propagation speed and attenuation characteristics of sound waves in the formation. By measuring the sound wave speed and attenuation in the formation, the elastic modulus, Poisson's ratio, lithology type, and fracture characteristics of the formation are inferred. The nuclear logging instrument uses radioactive isotope rays or neutron beams to measure the radioactive reaction and neutron scattering in the formation. The circumferential resistivity logging instrument is used to measure the resistivity change of the formation along the wellbore direction to detect fractures, rock conductivity, and reservoir connectivity characteristics.

6. The corrosion status assessment device for horizontal wellbore according to claim 1, characterized in that: The logging instrument (400) includes a magnetic wall thickness logging instrument and a contact multi-arm caliper imaging logging instrument.

7. The corrosion assessment device for horizontal wellbore according to claim 1, characterized in that: The crawler (200) and the controller (100) are connected via a logging cable, and the diameter of the logging cable is greater than 20 mm.

8. The corrosion status assessment device for horizontal wellbore according to claim 2, characterized in that: The device also includes coiled tubing, and the logging cable is located in the coiled tubing, and the logging cable is manufactured integrally with the coiled tubing in a pre-installed manner.

9. A method for assessing the corrosion status of a horizontal wellbore, characterized in that: Includes the following steps: S100, lower the crawler (200), video recording equipment (300) and logging device (400) into the target horizontal well; S200 and controller (100) control the crawler (200) to drive the video shooting equipment (300) and logging equipment (400) to move in the target horizontal well and obtain wall video data and wall detection data; S300, Controller (100) assesses the corrosion status of the target horizontal wellbore based on wall video data and wall detection data.

10. The method for assessing the corrosion status of a horizontal wellbore according to claim 9, characterized in that: The corrosion types in step S300 include perforation corrosion, ring corrosion, linear corrosion, flaking corrosion, and spot corrosion.

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