Device for realizing short-axis logging close to well wall and logging method
By designing a device that combines a rotating sub and a caliper, measurements along the minor axis of an elliptical wellbore are achieved close to the well wall. This solves the measurement quality problem caused by well wall collapse along the major axis, and improves the accuracy and efficiency of logging.
Patent Information
- Application Number
- CN202411145847.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2026-03-03
AI Technical Summary
In elliptical wells, the wellbore wall along the major axis is prone to collapse, leading to a decline in the quality of measurements taken along the wellbore wall. This necessitates subsequent curve correction, which is complex and difficult.
A device comprising a rotating sub, a caliper, and a single-push-and-close logging instrument is employed. By designing the arrangement of the double support arm and the push-and-close arm, the logging instrument can be placed close to the short axis of the well wall for measurement, avoiding collapse in the long axis direction, and using an eccentric detector for accurate measurement.
The acquisition phase prevented wellbore collapse, improved the accuracy and stability of logging data, reduced the need for subsequent corrections, and improved measurement efficiency and data quality.
Smart Images
Figure CN121593780A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of petroleum logging technology, specifically relating to a device and logging method for achieving short-axis logging close to the wellbore. Background Technology
[0002] Well logging is a branch of applied geophysics. It's a technique used in the exploration and development of underground mineral deposits such as oil, natural gas, coal, and metals. It utilizes various instruments to detect various physical parameters of the formation and the wellbore condition. It's a comprehensive technical science that applies physical principles to solve geological and engineering problems. Well logging technology is divided into two measurement methods based on the instrument's position in the wellbore: wall-mounted logging and center-mounted logging. In center-mounted logging, the logging instrument is positioned at the center of the wellbore using a centralizer; this mode is used for lateral logging, induction logging, and sonic logging. In wall-mounted logging, the instrument probe is pushed against the wellbore wall using a pusher arm; this mode is used for instruments such as neutron density, eccentric NMR, microspheres, and microelectrodes. Wall-mounted logging, because the probe is directly against the wellbore wall, is less affected by the drilling mud (density, viscosity, salinity, additives, etc.) inside the wellbore, resulting in measurements closer to the formation and offering higher resolution. However, because the probe is directly against the wellbore wall, the smoothness of the wellbore wall significantly affects the data quality.
[0003] Deep and ultra-deep exploration practices have revealed that wellbore shapes are often not perfectly circular, but rather most closely resemble ellipses. The stability of elliptical wellbore walls exhibits certain regularities. Elliptical wellbore formation is primarily caused by a combination of factors, including uneven geostress, lithology, wellbore collapse, rock creep, and the scouring effect of drilling fluids. Uneven geostress is the main cause of elliptical wellbore formation. Typically, after an elliptical wellbore forms, its major axis corresponds to the direction of minimum horizontal geostress, while its minor axis corresponds to the direction of maximum horizontal geostress. Along the major axis, due to stress concentration and shear stress, the wellbore wall is prone to collapse or cave-in, while along the minor axis, the wellbore wall is relatively regular and less prone to collapse. With the continuous advancement of oil and gas exploration into deeper and ultra-deep formations and the increasing speed of drilling, wellbore collapse or cave-in caused by stress imbalance is becoming increasingly common, severely impacting the quality of data obtained from wellbore measurements.
[0004] Currently, when using the wellbore-side measurement method, the logging is conducted using a single push-to-log tool during the acquisition phase, along the major axis of the elliptical wellbore. Since the major axis of the elliptical wellbore is prone to collapse, affecting the quality of the logging data, post-processing correction of the logging curve is required, which is very complex.
[0005] Therefore, developing a new type of logging device that can effectively avoid the impact of wellbore collapse and improve the quality of logging data has become an urgent problem to be solved in the current oil and gas exploration field. Summary of the Invention
[0006] The purpose of this invention is to provide a device and method for logging along the short axis of the well wall, which solves the problem of needing to correct the curve after the well wall collapses along the long axis.
[0007] This invention is achieved through the following technical solution:
[0008] This invention discloses a device for achieving short-axis logging that adheres to the wellbore, comprising a rotating sub, a caliper, and a single-push logging instrument connected in sequence with flexibility;
[0009] The single push-and-hold logging tool includes a push-and-hold arm, and the caliper is equipped with two support arms, which are evenly distributed around the circumference of the caliper.
[0010] The push arm and the support arm are perpendicular to each other.
[0011] Furthermore, the single-push logging tool includes an eccentric detector, which is arranged radially opposite to the push arm of the single-push logging tool.
[0012] Furthermore, a first flexible sub connects the rotating sub to the caliper, and a second flexible sub connects the caliper to the single-push logging tool.
[0013] Furthermore, the caliper can be a two-arm caliper, a four-arm caliper, or a six-arm caliper;
[0014] The four-arm caliper retains only two support arms spaced 180° apart.
[0015] The six-arm caliper retains only two support arms spaced 180° apart.
[0016] Furthermore, the single-push logging tool can be a density logging tool, a neutron logging tool, a nuclear magnetic resonance logging tool, a microsphere logging tool, or a microelectrode logging tool.
[0017] The present invention also discloses a logging method based on the aforementioned device for achieving short-axis logging close to the wellbore, comprising the following steps:
[0018] During the lowering process, the double support arms and push arms are in the closed state;
[0019] When the logging tool is lowered to the bottom of the well and then measured, the double support arms are initially in the open state, with both support arms resting against the long axis side of the elliptical wellbore wall; the push arm is then in the open state, with the push arm resting against the short axis side of the elliptical wellbore wall, and the single push arm logging tool is used for eccentric measurement.
[0020] Furthermore, the specific steps during the upper measurement are as follows: First, open the support arms of the caliper. As the two support arms unfold, they gradually tend to move in the direction of the long axis of the elliptical wellbore. When the two support arms of the caliper rotate to the direction of the long axis of the elliptical wellbore, the two support arms are in the same direction as the long axis of the wellbore, and the orientation is completed.
[0021] Then, open the push arm of the single push logging tool and push it to move along the short axis of the wellbore for eccentric measurement. The logging is now complete.
[0022] Furthermore, when the push arm of the single push logging tool does not move along the short axis of the wellbore, the upper measurement is paused, the support arm and push arm are retracted, and the entire device is lowered to the bottom of the elliptical wellbore section for remeasurement.
[0023] Furthermore, before starting, adjust the caliper so that its support arm is perpendicular to the push arm of the single push logging tool.
[0024] Furthermore, the single-push logging tool includes an eccentric detector, which is used to perform eccentric measurements.
[0025] Compared with the prior art, the present invention has the following beneficial technical effects:
[0026] This invention discloses a device for short-axis logging close to the wellbore, comprising a rotating sub, a caliper, and a single-push logging instrument connected in sequence. The single-push logging instrument has a push arm, and the caliper has two support arms. The two support arms are evenly distributed circumferentially on the caliper, with the push arm perpendicular to the support arms. The single-push logging instrument mainly serves to collect data close to the wellbore's short axis; the rotating sub prevents the instrument string from rotating too quickly and deviating from its designed trajectory. This invention primarily adds a rotating sub and a caliper. Through the design of the double support arms and the placement of the push arm and support arms, when the double support arms of the caliper rotate to the long axis of the elliptical wellbore, the double support arms are aligned with the long axis of the wellbore. The elliptical wellbore hinders further rotation of the instrument, providing orientation for the instrument string. The push arm actively avoids the collapsed side of the wellbore, collecting data on the regular side of the wellbore. The extension and retraction of the push arm provides stable support and positioning for the single-push logging tool, while the precise measurements of the single-push logging tool provide real-time feedback on the wellbore status, offering data support for push arm adjustments. Compared to existing post-correction methods, this improvement to the logging device during the data acquisition phase eliminates the need for curve correction, fundamentally solving the problem of poor-quality data quality in wellbore collapse sections of heterogeneous formations, representing a significant leap forward. This invention is characterized by its simple operation, strong versatility, and wide applicability. The design concept of this invention also offers valuable insights for improving the quality of logging data in horizontal and highly deviated wells.
[0027] Furthermore, the single-push logging tool includes an eccentric detector. The relative arrangement of the eccentric detector and the push arm allows them to cooperate with each other during the measurement process, jointly ensuring the stability of the measurement process.
[0028] Furthermore, this invention connects a first flexible sub between the rotating sub and the caliper, and a second flexible sub between the caliper and the single-push logging tool. The flexible sub is a downhole instrument used in irregular wells, allowing it to bend in any direction during deployment, thus enabling the instrument string to move freely up and down in the well. The flexible subs are located before and after the caliper, increasing the instrument string's mobility and making the caliper's entry into the wellbore's long axis smoother.
[0029] This invention also discloses a logging method based on the aforementioned device for achieving short-axis logging close to the wellbore wall. During the initial logging operation, the support arm of the caliper is first opened for orientation. When encountering an elliptical wellbore section, the caliper enters that section first, and its caliper arm automatically extends along the long axis of the wellbore. After orientation, it drives the push arm of the subsequent single-push logging tool to move along the short axis of the wellbore. The eccentric detector on the single-push logging tool is close to the other side of the short axis of the wellbore for measurement. This invention provides a method for achieving short-axis logging close to the wellbore wall. During the acquisition phase, the push arm of the single-push logging tool actively avoids the side of the wellbore prone to collapse, acquiring data on the relatively regular side of the wellbore, thus completely solving the problem of poor quality measurement curves in heterogeneous, collapsible formations.
[0030] By using an eccentric detector close to the minor axis of the wellbore, this invention can accurately capture physical parameters at the minor axis location of the wellbore, such as density porosity and neutron porosity, thereby greatly improving measurement accuracy. This technical effect is particularly important in complex wellbore environments, effectively avoiding errors that may occur when using traditional logging tools in elliptical wellbore sections.
[0031] Furthermore, when the single-push logging tool of the present invention performs measurements in an elliptical wellbore section, if the push arm fails to move along the minor axis of the wellbore, the device can quickly respond and pause the measurement process, thereby avoiding measurement errors caused by improper push arm positioning. Simultaneously, by retracting the support arm and push arm and lowering the entire device to the bottom of the elliptical wellbore section for remeasurement, the present invention achieves precise adaptation and repositioning to the wellbore environment, ensuring the reliability and accuracy of the measurement results.
[0032] Improved measurement efficiency: By controlling the extension and retraction of the push arm and support arm, as well as the up and down movement of the device, this invention reduces manual intervention and improves the automation and efficiency of measurement.
[0033] Enhanced adaptability: The single-push logging tool of this invention can flexibly adapt to wellbore environments of different shapes and sizes, especially in elliptical wellbore sections. Through repositioning and measurement, it effectively overcomes the measurement difficulties of traditional logging tools under complex wellbore conditions.
[0034] Improving data quality: By precisely controlling the position of the push arm and the measurement position of the entire device, this invention ensures the accuracy and reliability of the measurement data, providing high-quality data support for subsequent geological analysis and oilfield development.
[0035] In summary, the single-push logging tool of the present invention significantly improves the accuracy, stability and efficiency of measurements when used in elliptical wellbore sections. It also enhances the adaptability of the equipment and reduces operational risks, providing strong technical support for oilfield exploration and development. Attached Figure Description
[0036] Figure 1 A schematic diagram of the structure of a device for realizing short-axis logging against the well wall provided by the present invention;
[0037] Figure 2 for Figure 1 A schematic diagram of the structure after rotating 90° counterclockwise;
[0038] Figure 3 A schematic diagram illustrating the working principle of the instrument provided by this invention in an elliptical wellbore.
[0039] The components include: 1. Rotating sub; 2. First flexible sub; 3. Caliper; 4. Second flexible sub; 5. Single push-and-hold logging instrument; 6. Support arm; 7. Eccentric detector; 8. Push-and-hold arm; 9. Elliptical wellbore wall; 10. Logging instrument string body. Detailed Implementation
[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.
[0041] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.
[0042] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, element, 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 the process, element, method, article, or apparatus.
[0043] Example 1
[0044] This invention discloses a device for realizing short-axis logging close to the well wall, wherein the main body is connected in the following order: rotating short section 1, well caliper 3, and single-push logging instrument 5.
[0045] The upper part of the rotating sub-section 1 is connected to instruments such as the horse bridle, remote transmission sub-section, and natural gamma, forming a complete instrument string.
[0046] The single-push logging tool 5 includes a push arm 8, and two support arms 6 are provided on the caliper 3. The two support arms 6 are evenly distributed around the circumference of the caliper 3. The push arm 8 and the support arms 6 are perpendicular to each other, as shown in the attached figure. Figure 3 As shown. This can be achieved through the keyway at the instrument connector or a special tool, ensuring the combined angle.
[0047] like Figure 1 and Figure 2 As shown, the single push-and-hold logging tool 5 also includes an eccentric detector 7, which is arranged opposite to the push-and-hold arm 8 along the radial direction of the single push-and-hold logging tool 5.
[0048] Specifically, the push arm 8 and the eccentric detector 7 are mounted on the housing of the single push logging tool 5.
[0049] The well gauge 3 can be an independent two-arm well gauge, or a four-arm or six-arm well gauge. When using a four-arm or six-arm well gauge, only the two support arms 6 spaced 180° apart are retained. Two-arm well gauges are relatively old-fashioned and not commonly used; four-arm or six-arm well gauges are more common. In this invention, only the two support arms 6 spaced 180° apart need to be retained, and the other support arms can be removed.
[0050] The single-push logging tool 5 can be used with density logging tools, neutron logging tools, nuclear magnetic resonance logging tools, eccentric logging tools, microsphere logging tools, or microelectrode logging tools, making it widely applicable and offering a variety of options.
[0051] The Rotary Sub 1 is a tool used in oilfield logging to prevent the downhole instrument string from rotating. It helps the instrument maintain alignment with the wellbore trajectory in deviated and horizontal wells, while eliminating the influence of downhole cable torque on the instrument. The Rotary Sub 1 works by using the rotation of its shaft to eliminate the effect of downhole cable torque on the instrument. When the cable rotates, the downhole instrument does not rotate due to the design of the Rotary Sub 1, thus maintaining its stability. Simultaneously, the design of the rotary connector ensures reliable signal transmission during rotation.
[0052] The borehole gauge 3 is an instrument specifically designed for measuring borehole diameter. As the borehole diameter changes, the arm of the gauge 3 opens or closes, causing the potentiometer slider to move, thus converting the change in borehole diameter into a change in resistance. When power is supplied to the potentiometer via a cable, the potential difference between the changing resistors reflects the change in borehole diameter.
[0053] The Single Push-and-Consist Logging Tool 5 is specifically designed to meet the diverse logging requirements of vertical, horizontal, and deviated oil wells. Through a specific push-and-consist technique, it ensures accurate and stable contact between the logging instrument and the wellbore, thereby acquiring accurate subsurface formation information. During the logging process, the Single Push-and-Consist Logging Tool 5 achieves the opening and closing of the electrode plates through the coordinated movement of its internal mechanisms. As the logging tool is raised or lowered within the well, the pusher automatically adjusts the position of the electrode plates according to changes in the well diameter, maintaining a consistent contact pressure with the wellbore. This moderate contact pressure ensures both the accuracy of the logging data and extends the service life of the logging tool.
[0054] Logging Principle: When the two support arms 6 of the caliper 3 are extended, they gradually tend to move along the major axis of the elliptical wellbore wall 9. During the logging process, the logging instrument rotates continuously due to the release of cable torque. When the double support arms 6 of the caliper 3 rotate to the major axis of the elliptical wellbore, the double support arms 6 are aligned with the major axis of the wellbore. The elliptical wellbore will hinder the continued rotation of the instrument, mainly serving as the instrument string orientation. The single push-fit logging instrument 5 mainly serves to collect data along the short axis of the wellbore wall, as shown in the attached figure. Figure 3 As shown. Rotating section 1 serves to prevent the instrument string from rotating too quickly and deviating from the designed trajectory.
[0055] Before the equipment is lowered to the bottom of the well, both the double support arm 6 and the push arm 8 are closed to avoid unnecessary collisions or damage to the well wall. When the equipment reaches the bottom of the well, the double support arm 6 is opened first to ensure that the equipment is stably supported at the bottom of the well. Then, the push arm 8 is opened to further enhance the stability and safety of the equipment.
[0056] By optimizing the opening sequence of the double support arm 6 and the push arm 8, this invention reduces the time for the equipment to adjust its position at the bottom of the well, thereby improving the efficiency of the entire operation process. In addition, the support arm 6 will autonomously tend to move in the direction of the long axis of the elliptical wellbore wall 9, reducing human intervention and lowering the difficulty of operation and error rate.
[0057] During well bottom operations, the stability of the equipment is of paramount importance. This invention ensures stable support of the equipment at the bottom of the well by opening the double support arm 6 first and then the push arm 8, effectively preventing safety hazards such as equipment tilting or sliding.
[0058] The combined system of the double support arm 6 and the push arm 8 of the present invention can be flexibly adjusted according to different well conditions and operational requirements, and has strong adaptability.
[0059] This invention provides a method for achieving short-axis logging close to the wellbore, comprising the following steps:
[0060] After connecting the flexible rotating sub 1, caliper 3 and single push logging instrument 5 on the ground, perform a power-on check and an instrument calibration check.
[0061] After the instrument assembly and inspection are completed, each instrument and auxiliary sub are disassembled and transported to the drilling platform via pulleys or power catwalks. Then, the logging instrument string body 10 is hard-connected by the connectors at both ends of the instrument in the order of the well and lowered into the well.
[0062] Adjust the wellbore gauge 3 by using the keyway at the instrument connector or a special tool to make its support arm 6 perpendicular to the push arm 8 of the single push-and-feed logging instrument 5.
[0063] Initially, the support arm 6 of the caliper 3 and the push arm 8 of the single push-and-feed logging instrument 5 are in the closed state, and the instruments are lowered to the bottom of the well.
[0064] During the measurement, the support arm 6 of the caliper 3 is first opened for orientation, and then the push arm 8 of the single push-and-pull logging instrument 5 is opened to push the instrument for eccentric measurement. When encountering an elliptical well section, the caliper 3 first enters the well section, and its caliper arm automatically extends along the long axis of the well, driving the push arm 8 of the subsequent single push-and-pull logging instrument 5 to move along the short axis of the well, so that the eccentric detector 7 of the push-and-pull instrument is close to the other side of the short axis of the well for measurement.
[0065] When the push arm 8 of the single push-and-resist logging tool 5 does not move along the short axis of the wellbore, the upper measurement can be paused, the support arm 6 and the push arm 8 can be retracted, and the instrument string can be lowered to the bottom of the elliptical wellbore section for remeasurement.
[0066] Even better, if real-time visual observation of the attitude adjustment of the caliper 3 is required, a well inclination azimuth instrument can be installed at the upper or lower end of the caliper 3. The caliper 3 and the well inclination azimuth instrument can be calibrated, and the operating attitude of the instrument string can be determined by the azimuth curve of the No. 1 electrode plate. If the caliper 3 has a power caliper function, the attitude adjustment of the instrument string can be achieved by adjusting the pushing force of the caliper 3.
[0067] The caliper 3 has two support arms 6. In order to locate the direction, one of the support arms 6 is generally defined as the No. 1 electrode plate. The orientation of the No. 1 electrode plate is its logging output curve, indicating which direction the No. 1 electrode plate is located in during the logging process, and thus determining whether it is on the long axis.
[0068] Example 2
[0069] like Figure 1 and Figure 2As shown, the main body connection sequence is as follows: rotating sub 1, first flexible sub 2, caliper 3, second flexible sub 4, and single push-and-close logging instrument 5.
[0070] A first flexible sub 2 is added between the rotating sub 1 and the caliper 3, and a second flexible sub 4 is added between the caliper 3 and the single-push logging tool 5. The flexible subs increase the mobility of the instrument string, making it easier for the caliper 3 to enter the long axis of the wellbore.
[0071] Flexible subs are auxiliary products used with logging tools, primarily in irregular sections of open-hole wells. The following is a detailed introduction to flexible subs:
[0072] The flexible sub is mainly used to allow bending in any direction during downhole operation, enabling the instrument string to move freely up and down in the well. It is installed in the middle section of the downhole instrument string or at a suitable location, serving both as a mechanical connection between the instruments at both ends and providing electrical connection with standard 31-pin plugs and sockets, ensuring smooth communication of electrical signals and data commands between the instruments.
[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A device for achieving short-axis logging close to the wellbore, characterized in that, It includes a rotating sub (1), a caliper (3), and a single push-and-close logging tool (5) that are connected in sequence with flexibility; The single push-and-hold logging tool (5) includes a push-and-hold arm (8), and the caliper (3) is provided with two support arms (6), which are evenly distributed in the circumferential direction of the caliper (3). The push arm (8) and the support arm (6) are perpendicular to each other.
2. The device for realizing short-axis logging close to the well wall according to claim 1, characterized in that, The single push-and-hold logging tool (5) includes an eccentric detector (7), and the eccentric detector (7) and the push-and-hold arm (8) are arranged opposite each other along the radial direction of the single push-and-hold logging tool (5).
3. The device for realizing short-axis logging close to the well wall according to claim 1, characterized in that, A first flexible short section (2) connects the rotating short section (1) to the caliper (3), and a second flexible short section (4) connects the caliper (3) to the single push-and-feed logging instrument (5).
4. The device for realizing short-axis logging close to the well wall according to claim 1, characterized in that, The well gauge (3) is a double-arm well gauge, a four-arm well gauge, or a six-arm well gauge; Among them, the four-arm caliper only retains two support arms (6) in the direction of 180° interval; The six-arm caliper retains only two support arms (6) spaced 180° apart in the direction of ...
5. The device for realizing short-axis logging close to the well wall according to claim 1, characterized in that, The single-push logging tool (5) is a density logging tool, neutron logging tool, nuclear magnetic resonance logging tool, microsphere logging tool or microelectrode logging tool.
6. A logging method based on the device for achieving short-axis logging against the wellbore as described in any one of claims 1-5, characterized in that, Includes the following processes: During the lowering process, the double support arm (6) and the push arm (8) are in the closed state; When the device is lowered to the bottom of the well and then measured, the double support arm (6) is in the open state first, and the double support arm (6) is close to the long axis side of the elliptical well wall (9); the push arm (8) is then in the open state, and the push arm (8) is close to the short axis side of the elliptical well wall (9), and the single push logging instrument (5) performs eccentric measurement.
7. The logging method according to claim 6, characterized in that, The specific steps during the test are as follows: First, open the support arm (6) of the caliper (3). When the two support arms (6) are unfolded, they gradually tend to move in the direction of the long axis of the elliptical wellbore wall (9). When the double support arms (6) of the caliper (3) rotate to the direction of the long axis of the elliptical wellbore, the double support arms (6) are in the same direction as the long axis of the wellbore, and the orientation is completed. Then, open the push arm (8) of the single push logging instrument (5) and push it to move along the short axis of the wellbore to perform eccentric measurement. The logging is now complete.
8. The logging method according to claim 6, characterized in that, When the push arm (8) of the single push-and-resist logging tool (5) does not move along the short axis of the wellbore, pause the upward measurement, retract the support arm (6) and the push arm (8), and lower the entire device to the bottom of the elliptical wellbore section to remeasure.
9. The logging method according to claim 6, characterized in that, Before starting, adjust the caliper (3) so that its support arm (6) is perpendicular to the push arm (8) of the single push-and-feed logging instrument (5).
10. The logging method according to claim 6, characterized in that, The single-push logging tool (5) includes an eccentric detector (7), which is used to perform eccentric measurements.