A lithology density microsphere logging tool combined detection device

Abstract

This utility model discloses a combined detection device for lithological density microsphere logging, belonging to the field of petroleum logging technology. It includes an instrument body, a drive mechanism, a microsphere focusing measuring element, and a lithological density measuring element. The drive mechanism is located within the instrument body. The microsphere focusing measuring element measures the resistivity microsphere focusing parameters of the formation within the wellbore. The lithological density measuring element measures the lithological density parameters of the formation within the wellbore. The microsphere focusing measuring element and the lithological density measuring element are respectively located on opposite sides of the instrument body and are connected to the drive mechanism. The drive mechanism is configured to simultaneously drive the microsphere focusing measuring element and the lithological density measuring element to expand radially outward along the instrument body, so that the measuring surfaces of the microsphere focusing measuring element and the lithological density measuring element respectively contact the wellbore. This detection device simplifies the operation process, reduces the workload of logging personnel, lowers the possibility of errors due to cumbersome operation, and improves measurement reliability and stability.

Description

Technical Field

[0001] This utility model relates to the field of oil well logging technology, and in particular to a combined detection device for a lithology density microsphere logging tool. Background Technology

[0002] In the field of oil well logging, geophysical logging is a crucial technical means. It uses electrical and physical techniques to measure various parameters of different underground strata and conduct comprehensive physical interpretations based on these measurements, providing key data support for oil exploration and extraction.

[0003] Currently, microsphere logging and lithology density measurement rely on different equipment. During well logging operations, two logging instruments are typically deployed separately to obtain the corresponding data for microsphere logging and lithology density measurement. However, this current method, involving sequential deployment of two instruments, increases the time required for logging and prolongs the overall logging operation cycle. For logging personnel, operating two instruments undoubtedly increases the workload, consuming more manpower and potentially leading to errors due to the cumbersome procedures. Utility Model Content

[0004] The purpose of this invention is to provide a combined detection device for lithological density microsphere logging tools, in order to solve the technical problem that existing logging equipment requires two logging tools to perform microsphere measurement and lithological density measurement separately, resulting in low measurement efficiency and high cost.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A lithology density microsphere logging tool combination detection device includes:

[0007] Instrument body;

[0008] The drive mechanism is located within the main body of the instrument;

[0009] Microsphere focusing measuring device, used to measure the resistivity microsphere focusing parameters of wellbore formations;

[0010] A lithological density measuring instrument is used to measure the lithological density parameters of the formation within the wellbore.

[0011] The microsphere focusing measuring element and the lithological density measuring element are respectively disposed on opposite sides of the instrument body and are respectively connected to the driving mechanism. The driving mechanism is configured to simultaneously drive the microsphere focusing measuring element and the lithological density measuring element to expand outward along the radial direction of the instrument body, so that the measuring surfaces of the microsphere focusing measuring element and the lithological density measuring element respectively abut against the well wall.

[0012] Preferably, the driving mechanism is a motor push rod, and the output end of the motor push rod is connected to the microsphere focusing measuring element and the lithology density measuring element, respectively.

[0013] Preferably, the lithology density microsphere logging tool combination detection device further includes a movable connecting rod, an auxiliary connecting rod, and a main push rod. One end of the movable connecting rod is rotatably connected to one end of the lithology density measuring element, and the other end of the movable connecting rod is rotatably connected to the instrument body. One end of the auxiliary connecting rod is rotatably connected to the other end of the lithology density measuring element, and the other end of the auxiliary connecting rod is rotatably connected to the instrument body. One end of the main push rod is connected to the output end of the drive mechanism, and the other end of the main push rod is movably connected to the lithology density measuring element.

[0014] Preferably, the lithological density measuring device has a guide groove in the middle along its own axis, and the other end of the main push rod is provided with a slider, which is slidably connected to the guide groove.

[0015] Preferably, the lithology density microsphere logging tool combination detection device further includes an electrode connecting rod and an electrode push rod. One end of the electrode connecting rod is rotatably connected to one end of the microsphere focusing measuring element, and the other end of the electrode connecting rod is rotatably connected to the instrument body. One end of the electrode push rod is connected to the output end of the drive mechanism, and the other end of the electrode push rod is rotatably connected to the microsphere focusing measuring element.

[0016] Preferably, the instrument body, the electrode connecting rod, the electrode push rod, and the microsphere focusing measuring component constitute a parallelogram crank-connecting rod mechanism.

[0017] Preferably, the electrode push rod includes a long rod and a short rod connected to each other, the long rod and the short rod are set at an obtuse angle, the short rod is connected to the output end of the drive mechanism, the long rod is rotatably connected to the middle of the microsphere focusing measuring element, and the connection between the long rod and the short rod is rotatably connected to the instrument body.

[0018] Preferably, in the non-deployed state, the microsphere focusing measuring element and the lithological density measuring element are housed inside the main body of the instrument.

[0019] Preferably, the microsphere focusing measuring device includes a first mounting housing and a microsphere electrode plate, the first mounting housing being connected to the driving mechanism, and the microsphere electrode plate being detachably disposed on the side of the first mounting housing near the well wall.

[0020] Preferably, the lithological density measuring device includes a second mounting housing and a density probe, the second mounting housing being connected to the drive mechanism, and the density probe being detachably mounted on the side of the second mounting housing near the well wall.

[0021] The beneficial effects of this utility model are:

[0022] The lithology density microsphere logging tool combination detection device proposed in this utility model is used by first vertically lowering the main body of the instrument along its own axis to the predetermined measurement position inside the well. Upon reaching the measurement position, the drive mechanism installed within the main body of the instrument is activated. The drive mechanism begins to operate, pushing the microsphere focusing measuring element and the lithology density measuring element, located on opposite sides of the main body of the instrument, outwards along the radial direction of the main body. As the unfolding action proceeds, the measuring surface of the microsphere focusing measuring element gradually approaches and eventually abuts against one side of the well wall, while simultaneously, the measuring surface of the lithology density measuring element abuts against the opposite side of the well wall. At this point, the microsphere focusing measuring element begins to measure the resistivity microsphere focusing parameters of the formation within the well wall, while the lithology density measuring element simultaneously measures the lithology density parameters of the formation within the well wall. After the measurement is completed, the drive mechanism reverses its operation, moving the microsphere focusing measuring element and the lithology density measuring element away from the well wall, and then the main body of the instrument is removed from the well, completing the entire measurement process.

[0023] By placing the microsphere focusing measuring element and the lithology density measuring element on opposite sides of the instrument body and connecting them to the drive mechanism, the problems of low measurement efficiency and high cost in existing technologies are effectively solved. The drive mechanism can simultaneously drive the two measuring elements to expand radially outward from inside the instrument body, so that the measuring surfaces of the microsphere focusing measuring element and the lithology density measuring element simultaneously contact the well wall. This enables synchronous measurement of microsphere focusing parameters and lithology density parameters, avoiding the need for two logging instruments to be run into the well sequentially, significantly shortening logging time and improving measurement efficiency. Moreover, only one instrument body and drive mechanism are required, reducing the number of devices and lowering instrument costs. At the same time, the simplified operation of a single instrument reduces the workload of logging personnel, decreases the possibility of errors due to cumbersome operation, and improves measurement reliability and stability, providing an efficient and economical measurement solution for oil well logging. Attached Figure Description

[0024] Figure 1 This is a partial structural schematic diagram of the lithology density microsphere logging tool combination detection device provided in this embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the lithology density microsphere logging tool combination detection device provided in this embodiment of the utility model.

[0026] In the picture:

[0027] 1. Instrument body; 2. Drive mechanism; 3. Microsphere focusing measuring component; 31. First mounting housing; 32. Microsphere electrode plate; 4. Lithology density measuring component; 41. Second mounting housing; 42. Density probe; 43. Guide groove; 5. Movable connecting rod; 6. Auxiliary connecting rod; 7. Main push rod; 71. Slider; 8. Electrode plate connecting rod; 9. Electrode plate push rod; 91. Long rod; 92. Short rod. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] In the field of oil well logging, geophysical logging is a crucial technical means. It uses electrical and physical techniques to measure various parameters of different underground strata and conduct comprehensive physical interpretations based on these measurements, providing key data support for oil exploration and extraction.

[0033] Currently, microsphere logging and lithology density measurement rely on different equipment. During well logging operations, two logging instruments are typically deployed separately to obtain the corresponding data for microsphere logging and lithology density measurement. However, this current method, involving sequential deployment of two instruments, increases the time required for logging and prolongs the overall logging operation cycle. For logging personnel, operating two instruments undoubtedly increases the workload, consuming more manpower and potentially leading to errors due to the cumbersome procedures.

[0034] The purpose of this invention is to provide a combined detection device for lithological density microsphere logging tools, in order to solve the technical problem that existing logging equipment requires two logging tools to perform microsphere measurement and lithological density measurement separately, resulting in low measurement efficiency and high cost.

[0035] See Figure 1 and Figure 2 The lithological density microsphere logging tool combination detection device provided in this embodiment includes an instrument body 1, a drive mechanism 2, a microsphere focusing measuring element 3, and a lithological density measuring element 4. The drive mechanism 2 is disposed within the instrument body 1; the microsphere focusing measuring element 3 is used to measure the resistivity microsphere focusing parameters of the formation within the wellbore; the lithological density measuring element 4 is used to measure the lithological density parameters of the formation within the wellbore. The microsphere focusing measuring element 3 and the lithological density measuring element 4 are respectively disposed on opposite sides of the instrument body 1 and are respectively connected to the drive mechanism 2. The drive mechanism 2 is configured to simultaneously drive the microsphere focusing measuring element 3 and the lithological density measuring element 4 to expand radially outward along the instrument body 1, so that the measuring surfaces of the microsphere focusing measuring element 3 and the lithological density measuring element 4 respectively abut against the wellbore.

[0036] The lithology density microsphere logging tool combination detection device proposed in this utility model is used by first vertically lowering the instrument body 1 along its own axis to the predetermined measurement position inside the well. After reaching the measurement position, the drive mechanism 2 installed inside the instrument body 1 is activated. The drive mechanism 2 starts operating, pushing the microsphere focusing measuring element 3 and the lithology density measuring element 4, located on opposite sides of the instrument body 1, outward along the radial direction of the instrument body 1. As the unfolding action proceeds, the measuring surface of the microsphere focusing measuring element 3 gradually approaches and eventually abuts against one side of the well wall, while at the same time, the measuring surface of the lithology density measuring element 4 also abuts against the opposite side of the well wall. At this time, the microsphere focusing measuring element 3 begins to measure the resistivity microsphere focusing parameters of the formation in the well wall, and the lithology density measuring element 4 simultaneously measures the lithology density parameters of the formation in the well wall. After the measurement is completed, the drive mechanism 2 reverses its operation, moving the microsphere focusing measuring element 3 and the lithology density measuring element 4 away from the well wall, and then the instrument body 1 is removed from the well, completing the entire measurement process.

[0037] By placing the microsphere focusing measuring element 3 and the lithology density measuring element 4 on opposite sides of the instrument body 1 and connecting them to the drive mechanism 2, the problems of low measurement efficiency and high cost in existing technologies are effectively solved. The drive mechanism 2 can simultaneously drive the two measuring elements to expand radially outward from inside the instrument body 1, so that the measuring surfaces of the microsphere focusing measuring element 3 and the lithology density measuring element 4 simultaneously contact the well wall, realizing synchronous measurement of microsphere focusing parameters and lithology density parameters. This avoids the need for two logging instruments to be run into the well sequentially, significantly shortening logging time and improving measurement efficiency. Moreover, only one set of instrument body 1 and drive mechanism 2 is required, reducing the number of devices and lowering instrument costs. At the same time, the simplified operation of a single instrument reduces the workload of logging personnel, lowers the possibility of errors due to cumbersome operation, and improves measurement reliability and stability, providing an efficient and economical measurement solution for oil well logging.

[0038] The specific structure and working principle of this lithology density microsphere logging tool combination detection device are described in detail below.

[0039] The microsphere focusing measuring device 3 is used to measure the resistivity microsphere focusing parameters of the wellbore formation; the lithological density measuring device 4 is used to measure the lithological density parameters of the wellbore formation.

[0040] Specifically, the microsphere focusing measuring device 3 includes a first mounting housing 31 and a microsphere electrode 32. The first mounting housing 31 is connected to the drive mechanism 2, and the microsphere electrode 32 is detachably disposed on the side of the first mounting housing 31 near the well wall. The lithological density measuring device 4 includes a second mounting housing 41 and a density probe 42. The second mounting housing 41 is connected to the drive mechanism 2, and the density probe 42 is detachably disposed on the side of the second mounting housing 41 near the well wall.

[0041] By detachably mounting the microsphere electrode 32 to the first mounting housing 31 and the density probe 42 to the second mounting housing 41, the practicality and ease of maintenance of the device are enhanced. When the microsphere electrode 32 and density probe 42 wear down due to long-term contact with the well wall or require replacement with different specifications of components depending on the specific well conditions, operators do not need to disassemble the entire microsphere focusing measurement component 3 or lithology density measurement component 4. They can directly and quickly separate and replace the microsphere electrode 32 and density probe 42 at the work site or base. This modular design shortens the time required for maintenance, reduces the risk of overall instrument downtime due to component damage, and ensures the continuity of logging operations. At the same time, this structure also provides a flexible expansion basis for adapting to different measurement needs. When facing wells under different working conditions, diverse detection requirements can be met simply by replacing specific microsphere electrode 32 and density probe 42, further improving the overall efficiency of the device and reducing long-term operation and maintenance costs.

[0042] It should be understood that the microsphere electrode 32 is used to measure the resistivity microsphere focusing parameters of the formation in the wellbore; the density probe 42 is used to measure the lithological density parameters of the formation in the wellbore. Both are conventional functional components related to well logging, and their specific working principles and internal structures are not the focus of this utility model, and those skilled in the art have general knowledge of them, so they will not be described in detail here.

[0043] The drive mechanism 2 is located inside the instrument body 1 and is used to drive the microsphere focusing measuring element 3 and the lithological density measuring element 4 connected thereto to unfold or retract.

[0044] Optionally, the drive mechanism 2 is a motor push rod, with its output ends connected to the microsphere focusing measuring element 3 and the lithology density measuring element 4, respectively. The motor push rod can precisely control the outward expansion of the microsphere focusing measuring element 3 and the lithology density measuring element 4, ensuring that their measuring surfaces accurately and stably adhere to the wellbore, thereby improving the accuracy and reliability of the measurement data. Its output ends are connected to the two measuring elements, enabling synchronous drive and ensuring that the microsphere focusing measuring element 3 and the lithology density measuring element 4 operate simultaneously, further shortening measurement time and improving measurement efficiency. Furthermore, the motor push rod has a relatively simple structure, making it easy to install, maintain, and debug. This not only reduces the overall complexity and manufacturing cost of the device but also facilitates the use and maintenance by logging personnel during actual operation, ensuring the long-term stable operation of the device.

[0045] In other embodiments, the drive mechanism 2 may also be selected from drive structures such as hydraulic cylinders, air pumps, and lead screw and nut pairs, which will not be described in detail here.

[0046] When the microsphere focusing measuring element 3 and the lithological density measuring element 4 are deployed outward along the radial direction of the instrument body 1, the measuring surfaces of the microsphere focusing measuring element 3 and the lithological density measuring element 4 respectively abut against the well wall to perform the measurement operation.

[0047] In its non-deployed state, the microsphere focusing measuring element 3 and the lithology density measuring element 4 are housed inside the instrument body 1. This effectively protects the microsphere focusing measuring element 3 and the lithology density measuring element 4, preventing them from being exposed to the outside and damaged by collisions with surrounding objects during instrument transportation and placement into the well, thus extending the service life of the measuring elements. Moreover, this storage method makes the overall structure of the instrument body 1 more compact, reducing the space occupied downhole, which is conducive to smooth passage through various complex well sections, reducing the risk of encountering obstacles or getting stuck, and improving the safety and efficiency of logging operations. In addition, the compact storage structure facilitates the overall operation and management of the instrument body 1, making it more convenient for operators during use and further ensuring the smooth progress of logging work.

[0048] Specifically, the lithology density microsphere logging tool combination detection device also includes a movable connecting rod 5, an auxiliary connecting rod 6, and a main push rod 7. One end of the movable connecting rod 5 is rotatably connected to one end of the lithology density measuring element 4, and the other end of the movable connecting rod 5 is rotatably connected to the instrument body 1. One end of the auxiliary connecting rod 6 is rotatably connected to the other end of the lithology density measuring element 4, and the other end of the auxiliary connecting rod 6 is rotatably connected to the instrument body 1. One end of the main push rod 7 is connected to the output end of the drive mechanism 2, and the other end of the main push rod 7 is movably connected to the lithology density measuring element 4.

[0049] When the drive mechanism 2 is activated, its output pushes the main push rod 7. One end of the main push rod 7 is connected to the output of the drive mechanism 2, and the other end is movably connected to the lithology density measuring element 4. Under the push of the main push rod 7, the lithology density measuring element 4 begins to move. Simultaneously, one end of the movable connecting rod 5 is rotatably connected to one end of the lithology density measuring element 4, and the other end is rotatably connected to the instrument body 1. One end of the auxiliary connecting rod 6 is rotatably connected to the other end of the lithology density measuring element 4, and the other end is rotatably connected to the instrument body 1. During the movement of the lithology density measuring element 4, the movable connecting rod 5 and the auxiliary connecting rod 6 rotate accordingly, supporting and guiding the lithology density measuring element 4 to expand radially outward from inside the instrument body 1 along a specific trajectory, ensuring that the lithology density measuring element 4 accurately adheres to the well wall.

[0050] The movable connecting rod 5 and auxiliary connecting rod 6 provide support and guidance from both ends of the lithology density measuring component 4. Working in conjunction with the main push rod 7, they ensure the lithology density measuring component 4 maintains a stable trajectory during deployment, preventing swaying or deviation and thus improving measurement accuracy. This stable movement helps the measuring surface of the lithology density measuring component 4 adhere more closely and evenly to the wellbore, obtaining more reliable lithology density parameters. The combined action of the movable connecting rod 5, auxiliary connecting rod 6, and main push rod 7 on the lithology density measuring component 4 ensures a more even distribution of driving force. This not only reduces the stress on individual connection points, lowers the risk of component damage, and extends the service life of the device, but also ensures that the lithology density measuring component 4 can be smoothly deployed and retracted under different operating conditions, improving the reliability of the device operation. This structural design makes the deployment and retraction of the lithology density measuring component 4 more flexible, better adapting to the shape and conditions of the wellbore under different well conditions. Even in cases of irregular well walls, the movable connecting rod 5 and the auxiliary connecting rod 6 can adjust themselves by rotation to help the lithological density measuring component 4 find a suitable contact position, ensuring the smooth progress of the measurement work and improving the environmental adaptability of the combined detection device.

[0051] More specifically, the lithological density measuring element 4 has a guide groove 43 axially formed in the middle, and a slider 71 is provided at the other end of the main push rod 7, which is slidably connected to the guide groove 43. When the drive mechanism 2 pushes the main push rod 7, the slider 71 at the end of the main push rod 7 slides within the guide groove 43 axially formed in the middle of the lithological density measuring element 4. As the main push rod 7 moves, the slider 71 moves within the guide groove 43, thereby driving the lithological density measuring element 4 to move in the direction of the force applied by the main push rod 7. Since the slider 71 and the guide groove 43 are slidably connected, this connection method allows the lithological density measuring element 4 to have a certain amount of room for movement during its movement. When encountering irregular well wall shapes or other situations that may hinder movement, the lithological density measuring element 4 can be finely adjusted by sliding the slider 71 within the guide groove 43, avoiding jamming due to a rigid connection.

[0052] The lithology density microsphere logging tool combination detection device also includes an electrode connecting rod 8 and an electrode push rod 9. One end of the electrode connecting rod 8 is rotatably connected to one end of the microsphere focusing measuring element 3, and the other end of the electrode connecting rod 8 is rotatably connected to the instrument body 1. One end of the electrode push rod 9 is connected to the output end of the drive mechanism 2, and the other end of the electrode push rod 9 is rotatably connected to the microsphere focusing measuring element 3.

[0053] When the drive mechanism 2 is activated, its output end pushes the electrode push rod 9. One end of the electrode push rod 9 is connected to the output end of the drive mechanism 2, and the other end is rotatably connected to the microsphere focusing measuring element 3, thereby causing the microsphere focusing measuring element 3 to begin moving. At the same time, one end of the electrode connecting rod 8 is rotatably connected to one end of the microsphere focusing measuring element 3, and the other end is rotatably connected to the instrument body 1. During the movement of the microsphere focusing measuring element 3, the electrode connecting rod 8 rotates accordingly with the movement of the microsphere focusing measuring element 3, playing a role in supporting and guiding the microsphere focusing measuring element 3 to expand radially outward from inside the instrument body 1 along a specific trajectory, so that the microsphere focusing measuring element 3 can move accurately towards the well wall until the measuring surface is in contact with the well wall.

[0054] The electrode connecting rod 8 and the electrode push rod 9 work together to provide stable motion guidance for the microsphere focusing measuring element 3. One end of the electrode connecting rod 8 is connected to the instrument body 1, and the other end rotates with the microsphere focusing measuring element 3, ensuring the motion stability of the microsphere focusing measuring element 3 during deployment and preventing it from wobbling or deviating during radial movement. This ensures that the measuring surface of the microsphere focusing measuring element 3 can accurately adhere to the well wall. When encountering an irregular well wall, the microsphere focusing measuring element 3 can fine-tune its position and angle through its rotational connection with the electrode push rod 9 and the electrode connecting rod 8, ensuring that the measuring surface fully adheres to the well wall, effectively improving the measurement adaptability of the device under different well conditions.

[0055] More specifically, the electrode push rod 9 includes a long rod 91 and a short rod 92 connected to each other. The long rod 91 and the short rod 92 are set at an obtuse angle. The short rod 92 is connected to the output end of the drive mechanism 2. The long rod 91 is rotatably connected to the middle of the microsphere focusing measuring element 3. The connection between the long rod 91 and the short rod 92 is rotatably connected to the instrument body 1.

[0056] When the drive mechanism 2 is activated, its output end pushes the short rod 92. Since the short rod 92 and the long rod 91 are connected at an obtuse angle and the connection point is rotatably connected to the instrument body 1, the movement of the short rod 92 causes the long rod 91 to rotate around the connection point as a fulcrum. The other end of the long rod 91 is rotatably connected to the middle of the microsphere focusing measuring element 3, thereby driving the microsphere focusing measuring element 3 to make a circular motion around the end connected to the electrode connecting rod 8, realizing radial outward expansion from inside the instrument body 1 until the measuring surface of the microsphere focusing measuring element 3 is in contact with the well wall.

[0057] The electrode push rod 9 employs a structure where the long rod 91 and the short rod 92 are set at an obtuse angle, similar to the lever principle, which amplifies the force output by the drive mechanism 2. When the short rod 92 is subjected to force, it is transmitted to the long rod 91 through the obtuse angle structure, allowing the long rod 91 to push the microsphere focusing measurement element 3 with a smaller driving force, effectively saving driving energy. Simultaneously, this structure allows for more precise control of the deployment angle and position of the microsphere focusing measurement element 3, improving measurement accuracy. The long rod 91 is rotatably connected to the middle of the microsphere focusing measurement element 3, and combined with the auxiliary support of the electrode connecting rod 8, provides a stable three-point support structure for the microsphere focusing measurement element 3. During deployment, this structure effectively reduces the swaying and offset of the microsphere focusing measurement element 3, making its movement smoother and ensuring close contact between the measurement surface and the well wall, further improving the reliability of the measurement data.

[0058] Preferably, the instrument body 1, electrode connecting rod 8, electrode push rod 9, and microsphere focusing measuring element 3 constitute a parallelogram crank-connecting rod mechanism, ensuring that the measuring surface of the microsphere focusing measuring element 3 is always parallel to the well wall when deployed. When the drive mechanism 2 pushes the electrode push rod 9, the parallelogram structure formed by the instrument body 1, electrode connecting rod 8, electrode push rod 9, and microsphere focusing measuring element 3 causes the microsphere focusing measuring element 3 to deploy radially outward from the inside of the instrument body 1 along a direction parallel to the electrode connecting rod 8. Throughout the deployment process, based on the property that opposite sides of a parallelogram are always parallel, it ensures that the measuring surface of the microsphere focusing measuring element 3 remains parallel to the well wall when deployed. This design ensures that the measuring surface of the microsphere focusing measuring element 3 is always parallel to the well wall, making the distance between the microsphere focusing measuring element 3 and the well wall uniform during measurement. This avoids deviations in logging data caused by the microsphere focusing measuring element 3 tilting due to having only one fulcrum, and helps to obtain accurate resistivity microsphere focusing parameters. Furthermore, regardless of the complexity of the wellbore, the parallelogram crank-connecting rod mechanism ensures, through its structural characteristics, that the measuring surface of the microsphere focusing measuring element 3 remains parallel to the wellbore during deployment. This adaptability allows the logging tool to operate effectively in wellbore environments with different shapes and inclinations, expanding the applicability of this combined detection device.

[0059] It should be noted that the rotary connection methods used between the above-mentioned components, such as hinges and bearing connections, are all conventional techniques for achieving rotary connections in this field. The specific structure and selection of these connection forms are common knowledge to those skilled in the art and have mature applications in well logging instrument design; therefore, their implementation details will not be elaborated here.

[0060] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A combination detection device of a litho-density microsphere logging instrument, characterized in that, include: Instrument body (1); The drive mechanism (2) is located inside the instrument body (1); Microsphere focusing measuring device (3) is used to measure the resistivity microsphere focusing parameters of the wellbore formation; Lithology density measuring device (4), used to measure the lithology density parameters of the wellbore formation; The microsphere focusing measuring element (3) and the lithological density measuring element (4) are respectively disposed on opposite sides of the instrument body (1) and are respectively connected to the driving mechanism (2). The driving mechanism (2) is configured to simultaneously drive the microsphere focusing measuring element (3) and the lithological density measuring element (4) to expand outward along the radial direction of the instrument body (1), so that the measuring surface of the microsphere focusing measuring element (3) and the measuring surface of the lithological density measuring element (4) respectively abut against the well wall.

2. The combination probe of the litho-density microsphere logging instrument according to claim 1, wherein, The driving mechanism (2) is a motor push rod, and the output end of the motor push rod is connected to the microsphere focusing measuring device (3) and the lithological density measuring device (4) respectively.

3. The combination probe of the litho-density microsphere logging instrument of claim 1, wherein, The lithology density microsphere logging instrument combination detection device also includes a movable connecting rod (5), an auxiliary connecting rod (6), and a main push rod (7). One end of the movable connecting rod (5) is rotatably connected to one end of the lithology density measuring element (4), and the other end of the movable connecting rod (5) is rotatably connected to the instrument body (1). One end of the auxiliary connecting rod (6) is rotatably connected to the other end of the lithology density measuring element (4), and the other end of the auxiliary connecting rod (6) is rotatably connected to the instrument body (1). One end of the main push rod (7) is connected to the output end of the drive mechanism (2), and the other end of the main push rod (7) is movably connected to the lithology density measuring element (4).

4. The combination probe of the litho-density microsphere logging instrument of claim 3, wherein, The lithological density measuring device (4) has a guide groove (43) in the middle along its own axis, and the other end of the main push rod (7) is provided with a slider (71), which is slidably connected to the guide groove (43).

5. The combination tool of claim 1, wherein, The lithology density microsphere logging tool combination detection device also includes an electrode connecting rod (8) and an electrode push rod (9). One end of the electrode connecting rod (8) is rotatably connected to one end of the microsphere focusing measuring element (3), and the other end of the electrode connecting rod (8) is rotatably connected to the instrument body (1). One end of the electrode push rod (9) is connected to the output end of the drive mechanism (2), and the other end of the electrode push rod (9) is rotatably connected to the microsphere focusing measuring element (3).

6. The combination probe of claim 5, wherein, The instrument body (1), the electrode connecting rod (8), the electrode push rod (9), and the microsphere focusing measuring component (3) constitute a parallelogram crank-connecting rod mechanism.

7. The combination tool of claim 5, wherein, The electrode push rod (9) includes a long rod (91) and a short rod (92) connected to each other. The long rod (91) and the short rod (92) are set at an obtuse angle. The short rod (92) is connected to the output end of the drive mechanism (2). The long rod (91) is rotatably connected to the middle part of the microsphere focusing measuring device (3). The connection between the long rod (91) and the short rod (92) is rotatably connected to the instrument body (1).

8. The combination tool of claim 1, wherein, In the non-deployed state, the microsphere focusing measuring element (3) and the lithological density measuring element (4) are housed inside the instrument body (1).

9. The combination tool of claim 1, wherein, The microsphere focusing measuring device (3) includes a first mounting housing (31) and a microsphere electrode plate (32). The first mounting housing (31) is connected to the drive mechanism (2), and the microsphere electrode plate (32) is detachably disposed on the side of the first mounting housing (31) near the well wall.

10. The combination tool of claim 1, wherein, The lithological density measuring device (4) includes a second mounting housing (41) and a density probe (42). The second mounting housing (41) is connected to the drive mechanism (2), and the density probe (42) is detachably mounted on the side of the second mounting housing (41) near the well wall.

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