Well cementation combined logging instrument

Abstract

The utility model discloses a well cementation combined logging instrument, and belongs to the technical field of diameter measuring instruments. Comprising a shell, a connector is arranged at the end of the shell, a plurality of centralizers sleeve the shell, a plurality of mounting plates are arranged in the shell, and a sound system unit, an electronic circuit unit, a magnetic positioning unit, a natural gamma unit and a data transmission unit are mounted on each mounting plate; fixing holes are formed in the two sides of the shell, limiting blocks are arranged in the fixing holes in a penetrating mode, and the limiting blocks are movably connected with the mounting plate; according to the utility model, the mounting plate and the shell are quickly fixed and disassembled through the limiting block, the spring and the limiting column, and can be replaced without a special tool, so that the maintenance time of underground instruments is greatly shortened; the double fixed source distances are combined with the adjustable auxiliary receiver, the sound wave speed can be accurately calculated through the difference value of the fixed source distances, different stratum thicknesses can be flexibly adapted through the auxiliary receiver, and the measurement range is expanded.

Description

Technical Field

[0001] This utility model relates to the field of diameter measuring instrument technology, and more specifically, to a cementing combination logging instrument. Background Technology

[0002] In the exploration and development of oil and gas, cementing quality directly affects the production life, productivity, and environmental protection of oil and gas wells. After cementing operations are completed, logging instruments are needed to inspect the bonding quality between the cement sheath and the casing and formation to assess the cementing effect and provide a basis for subsequent production. Traditional cementing quality inspection methods have the following shortcomings: Early logging instruments had limited functionality, requiring multiple runs into the well to measure parameters such as acoustic amplitude (CBL), variable density (VDL), magnetic positioning (CCL), and natural gamma (GR), resulting in low logging efficiency, high cost, and increased risk of instrument sticking due to multiple runs. With the development of unconventional oil and gas resources such as deep oil and gas reservoirs and shale gas, the application of large-diameter casing (e.g., diameter exceeding 300 mm) has increased. Conventional logging instruments, due to fixed source distance and limited emission energy, suffer severe acoustic signal attenuation in large wellbores, making it difficult to effectively detect the cement sheath bonding quality, especially with insufficient accuracy in evaluating the second interface. The complex downhole environment, with mud noise and formation heterogeneity, can easily interfere with measurement signals. Traditional logging tools use fixed-gain amplifier circuits, which cannot adapt to signal attenuation under different wellbore conditions. This results in low CBL / VDL curve resolution, affecting the ability to identify cementing defects such as micro-annular gaps and channeling. Accurate depth positioning is crucial for cementing quality evaluation. Early magnetic positioning instruments had limited accuracy and poor synchronization with other logging parameters, leading to depth matching errors for different curves and affecting the overall interpretation results. Deep oil and gas wells have high downhole temperatures and pressures, making conventional logging tool electronic components prone to failure and unable to meet the requirements for long-term stable measurement. Therefore, we propose a cementing logging tool. Utility Model Content

[0003] The purpose of this invention is to provide a cementing logging tool to solve the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A cementing logging tool includes a housing, a connector at the end of the housing, multiple centralizers on the housing, and multiple mounting plates inside the housing. The mounting plates are equipped with an acoustic unit, an electronic circuit unit, a magnetic positioning unit, a natural gamma unit, and a data transmission unit.

[0006] Fixing holes are provided on both sides of the outer casing, and limit blocks are installed through the fixing holes. The limit blocks are movably connected to the mounting plate.

[0007] The acoustic unit includes a sound wave transmitter installed inside the housing and two sound wave receivers distributed along the axis. The sound wave receivers are located downstream of the sound wave transmitter, and the axial distances between the two sound wave receivers and the sound wave transmitter are the first source distance and the second source distance, respectively.

[0008] The electronic circuit unit includes a signal processing circuit board and a control circuit board. The signal processing circuit board is electrically connected to the sound wave receiver, and the control circuit board is electrically connected to the sound wave transmitter and the signal processing circuit board.

[0009] The magnetic positioning unit includes an induction coil and a signal conditioning circuit board electrically connected to it;

[0010] The natural gamma unit includes a scintillation crystal detector, a photomultiplier tube, and a counting circuit board electrically connected to it;

[0011] The data transmission unit includes a communication interface circuit board, which is electrically connected to the signal processing circuit board, the control circuit board, the signal conditioning circuit board, and the counting circuit board.

[0012] Preferably, the mounting plate has a limiting hole, and the two side walls of the limiting block have grooves. A spring is installed in the groove, and the end of the spring is connected to a limiting post. The limiting post slides with the groove, and the limiting post can be inserted into the limiting hole.

[0013] Preferably, the outer shell is a sealed cylinder made of a metal alloy that is resistant to high temperature and high pressure.

[0014] Preferably, one end of the inner side of the two limiting posts is connected by a pull rope, which extends to the outside of the limiting block.

[0015] Preferably, the first source distance is 3 feet and the second source distance is 5 feet; the acoustic unit also includes at least one auxiliary receiver, which is disposed in the housing by an adjustable mounting structure so that its axial distance from the acoustic transmitter can be adjusted within the range of 3 feet to 8.5 feet.

[0016] Preferably, the communication interface circuit board is equipped with an electromagnetic shielding cover made of permalloy, and the communication interface circuit board supports bidirectional data transmission.

[0017] Preferably, a thermally conductive silicone pad with a thickness of 0.5-2mm is provided between the signal processing circuit board and the control circuit board. The mounting plate has strip-shaped heat dissipation grooves at the positions corresponding to the signal processing circuit board and the control circuit board, and aluminum heat dissipation fins are provided in the heat dissipation grooves.

[0018] Preferably, the adjustable mounting structure includes an axial slide rail and a positioning bolt. The axial slide rail is fixed to the inner wall of the housing. The auxiliary receiver is slidably connected to the axial slide rail via a slider. The positioning bolt passes through the slider and is pressed against the axial slide rail for fixation.

[0019] An adjustable mounting structure is located above the mounting plate. A guide groove is provided below the slider on the mounting plate. A protruding rib is provided at the bottom of the slider to slide in cooperation with the guide groove. The protruding rib extends axially and is integrally formed with the slider.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] (1) The mounting plate and the outer shell of this utility model can be quickly fixed and disassembled through the limiting block, spring, limiting post and pull rope structure. Replacement can be completed without special tools, which greatly shortens the maintenance time of downhole instruments. The pull ring design at the outer end of the limiting block further simplifies the operation, improves the response speed of on-site operation and reduces the cost of tripping in and out of the well. The combination of dual fixed source distance and adjustable auxiliary receiver can accurately calculate the sound wave velocity through the fixed source distance difference, and can also flexibly adapt to different formation thicknesses through the auxiliary receiver to expand the measurement range.

[0022] (2) Through the collaborative design of each unit, this utility model achieves high precision, high reliability and high efficiency in downhole logging. The axial distribution design of the acoustic unit and the dual source distance comparison mechanism, combined with the signal refinement of the electronic circuit unit, can accurately invert the acoustic parameters of the formation. The casing coupling benchmark provided by the magnetic positioning unit and the lithological classification data of the natural gamma unit form a multi-dimensional geological reference, which greatly improves the accuracy of formation parameter inversion and provides reliable data support for cementing quality evaluation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the outer shell of this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection between the mounting plate and the outer shell of this utility model.

[0026] The following are the labels in the diagram: 1. Outer shell; 2. Centralizer; 3. Connector; 4. Acoustic wave transmitter; 5. Acoustic wave receiver; 6. Mounting plate; 7. Limiting block; 701. Groove; 8. Spring; 9. Limiting post. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example:

[0029] Please see Figure 1-3A cementing logging tool includes a housing 1, with a connector 3 at one end of the housing 1. Multiple centralizers 2 are fitted onto the housing 1, and multiple mounting plates 6 are installed inside the housing 1. Each mounting plate 6 is equipped with an acoustic unit, an electronic circuit unit, a magnetic positioning unit, a natural gamma unit, and a data transmission unit. Fixing holes are provided on both sides of the housing 1, with limit blocks 7 penetrating through these holes. The limit blocks 7 are movably connected to the mounting plates 6, facilitating the disassembly and fixing of the mounting plates 6. A pull ring can also be provided at the outer end of the limit blocks 7 to facilitate pulling the limit blocks 7 outwards for disassembly.

[0030] The acoustic unit includes a sound wave transmitter 4 installed inside the housing 1 and two sound wave receivers 5 distributed along the axial direction. The sound wave receivers 5 are located downstream of the sound wave transmitter 4, and the axial distances between the two sound wave receivers 5 and the sound wave transmitter 4 are the first source distance and the second source distance, respectively. By comparing the signal differences obtained by the two sound wave receivers 5 and combining the source distance difference, the propagation speed of sound waves in the medium can be accurately calculated, thereby retrieving key physical parameters of the strata such as porosity, lithology, and density, providing core acoustic data support for oil and gas exploration and geological analysis. The axial distribution design ensures that the sound wave propagation path is closer to the main axial direction, reducing lateral interference and improving signal stability and measurement accuracy.

[0031] The electronic circuit unit includes a signal processing circuit board and a control circuit board. The signal processing circuit board is electrically connected to the acoustic receiver 5, and the control circuit board is electrically connected to the acoustic transmitter 4 and the signal processing circuit board. The signal processing circuit board and the control circuit board in the electronic circuit unit work together to achieve accurate acquisition, processing and transmission of acoustic signals, providing data support for cementing quality evaluation.

[0032] The magnetic positioning unit includes an induction coil and a signal conditioning circuit board electrically connected to it; the magnetic positioning unit provides an indispensable depth reference for cementing logging tools by accurately identifying the position of the casing coupling.

[0033] The natural gamma unit includes a scintillation crystal detector, a photomultiplier tube, and a counting circuit board electrically connected to them. Through the coordinated operation of the scintillation crystal detector, the photomultiplier tube, and the counting circuit board, the natural gamma unit achieves accurate measurement of the intensity of natural gamma rays in the downhole formation, providing key basis for formation lithology classification, mud content determination, and geological stratification.

[0034] The data transmission unit includes a communication interface circuit board, which is electrically connected to the signal processing circuit board, control circuit board, signal conditioning circuit board, and counting circuit board. Through the unified function of the communication interface circuit board, the data transmission unit achieves centralized acquisition, standardized processing, stable transmission, and two-way command interaction of logging data. This ensures that the surface system can acquire multi-dimensional formation and instrument status information in real time, including acoustic waves, magnetic positioning, and natural gamma rays. Simultaneously, it allows for remote adjustment of instrument operating parameters, providing data transmission and control support for efficient cementing quality evaluation, formation parameter analysis, and logging operations.

[0035] In this application, the mounting plate 6 has a limiting hole, and the limiting block 7 has grooves 701 on both sides. A spring 8 is installed in the groove 701, and a limiting post 9 is connected to the end of the spring 8. The limiting post 9 slides in the groove 701 and can be inserted into the limiting hole. The limiting post 9 is fixed to the mounting plate 6 by the insertion of the limiting post 9 into the groove 701. When the limiting block 7 is inserted into the mounting plate 6, the limiting post 9 is squeezed into the groove 701 and the spring 8 is compressed. When the limiting post 9 is at the limiting hole, the spring 8 restores its elasticity and pushes the limiting post 9 into the limiting hole, thereby fixing the mounting plate 6.

[0036] In one possible embodiment, the inner ends of the two limiting posts 9 are connected by a pull rope, which extends to the outside of the limiting block 7. The pull rope slides with the limiting block 7. When disassembling the limiting block 7, the pull rope is pulled outward to pull the limiting post 9 into the groove 701. Then, the limiting block 7 is pulled outward to separate the limiting block 7 from the mounting plate 6.

[0037] In this application, the outer shell 1 is a sealed cylinder made of a metal alloy that is resistant to high temperature and high pressure.

[0038] In this application, the first source distance is 3 feet and the second source distance is 5 feet; the acoustic unit also includes at least one auxiliary receiver, which is disposed in the housing 1 by an adjustable mounting structure, so that its axial distance from the acoustic transmitter 4 can be adjusted within the range of 3 feet to 8.5 feet.

[0039] In this application, the straightener 2 includes an elastic support arm and a wear-resistant rubber pad. One end of the elastic support arm is fixedly connected to the outer shell 1, and the other end is connected to the wear-resistant rubber pad. The elastic support arms are evenly distributed around the outer shell 1, and the included angle between adjacent elastic support arms is 60°-90°.

[0040] In this application, the communication interface circuit board is equipped with an electromagnetic shielding cover made of permalloy. The communication interface circuit board supports bidirectional data transmission. The downhole environment contains complex electromagnetic interference sources. The permalloy shielding cover effectively shields external electromagnetic fields, preventing interference signals from entering the circuit board and ensuring the normal operation of internal electronic components. The shielding cover reduces interference from external electromagnetic noise to weak communication signals by reflecting and absorbing electromagnetic waves, ensuring the accuracy of data transmission. Simultaneously, it prevents electromagnetic waves generated by the circuit board itself from radiating outwards, avoiding interference with other downhole instruments and improving the overall anti-interference capability of the system.

[0041] In this application, a thermally conductive silicone pad with a thickness of 0.5-2mm is provided between the signal processing circuit board and the control circuit board. The mounting plate 6 has strip-shaped heat dissipation grooves corresponding to the positions of the signal processing circuit board and the control circuit board, with aluminum heat dissipation fins inside the grooves to improve heat dissipation efficiency. The heat generated by the circuit board during operation is quickly conducted to adjacent circuit boards or the mounting plate through the thermally conductive silicone pad, preventing localized overheating. The 0.5-2mm thick silicone pad can fill the tiny gaps between the circuit boards, reducing contact thermal resistance and ensuring efficient heat transfer. The silicone pad is insulating, preventing electrical short circuits between the two circuit boards; it also buffers vibrations, protecting precision electronic components from mechanical damage.

[0042] In this application, the adjustable mounting structure includes an axial slide rail and a positioning bolt. The axial slide rail is fixed to the inner wall of the housing 1. The auxiliary receiver is slidably connected to the axial slide rail via a slider. The positioning bolt passes through the slider and is pressed against the axial slide rail for fixation. The axial position of the auxiliary receiver can be adjusted by the cooperation between the slider and the axial slide rail.

[0043] An adjustable mounting structure is positioned above the mounting plate 6. The mounting plate 6 has a guide groove below the slider, and the bottom of the slider has a protruding rib that slides along the guide groove. The protruding rib extends axially and is integrally formed with the slider. When adjusting the position of the auxiliary receiver, the slider slides along the slide rail, and the protruding rib moves along the guide groove, thereby adjusting the axial position of the auxiliary receiver. After the position is adjusted, the slider position is fixed using positioning bolts.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. 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 cementing unit, comprising a housing (1), the housing (1) is provided with a connector (3) at the end, a plurality of centralizers (2) are sleeved on the housing (1), characterized in that: The outer casing (1) is provided with multiple mounting plates (6), and the mounting plates (6) are equipped with acoustic units, electronic circuit units, magnetic positioning units, natural gamma units and data transmission units; Fixing holes are provided on both sides of the outer shell (1), and a limiting block (7) is provided through the fixing hole. The limiting block (7) is movably connected to the mounting plate (6). The acoustic unit includes a sound wave transmitter (4) installed in the housing (1) and two sound wave receivers (5) distributed along the axis. The sound wave receivers (5) are located downstream of the sound wave transmitter (4), and the axial distances between the two sound wave receivers (5) and the sound wave transmitter (4) are the first source distance and the second source distance, respectively. The electronic circuit unit includes a signal processing circuit board and a control circuit board. The signal processing circuit board is electrically connected to the sound wave receiver (5), and the control circuit board is electrically connected to the sound wave transmitter (4) and the signal processing circuit board. The magnetic positioning unit includes an induction coil and a signal conditioning circuit board electrically connected to it. The natural gamma unit includes a scintillation crystal detector, a photomultiplier tube, and a counting circuit board electrically connected to it. The data transmission unit includes a communication interface circuit board, which is electrically connected to the signal processing circuit board, the control circuit board, the signal conditioning circuit board, and the counting circuit board.

2. A cementing assembly logging tool according to claim 1, characterized in that: The mounting plate (6) has a limiting hole, and the limiting block (7) has grooves (701) on both sides. A spring (8) is provided in the groove (701), and the end of the spring (8) is connected to a limiting post (9). The limiting post (9) slides with the groove (701), and the limiting post (9) can be inserted into the limiting hole.

3. A cement evaluation tool according to claim 1, characterized in that: The outer shell (1) is a sealed cylinder made of a metal alloy that is resistant to high temperature and high pressure.

4. A cement evaluation tool according to claim 2, characterized in that: The inner ends of the two limiting posts (9) are connected by a pull rope, which extends to the outside of the limiting block (7).

5. A cement evaluation tool according to claim 1, wherein: The first source distance is 3 feet, and the second source distance is 5 feet; the acoustic unit also includes at least one auxiliary receiver, which is disposed in the housing (1) by an adjustable mounting structure, so that its axial distance from the acoustic transmitter (4) can be adjusted within the range of 3 feet to 8.5 feet.

6. A cement evaluation tool according to claim 1, characterized in that: The communication interface circuit board is equipped with an electromagnetic shielding cover made of permalloy, and the communication interface circuit board supports bidirectional data transmission.

7. A cement evaluation tool according to claim 1 wherein: A thermally conductive silicone pad is provided between the signal processing circuit board and the control circuit board. The thermally conductive silicone pad has a thickness of 0.5-2mm. The mounting plate (6) has strip-shaped heat dissipation grooves at the positions corresponding to the signal processing circuit board and the control circuit board. Aluminum heat dissipation fins are provided in the heat dissipation grooves.

8. A cement evaluation tool according to claim 5, characterized in that: The adjustable mounting structure includes an axial slide rail and a positioning bolt. The axial slide rail is fixed to the inner wall of the outer shell (1). The auxiliary receiver is slidably connected to the axial slide rail through a slider. The positioning bolt passes through the slider and is abutted against the axial slide rail for fixation. The adjustable mounting structure is arranged above a mounting plate (6), a guide sliding groove is arranged below the mounting plate (6) corresponding to the sliding block, a convex rib is arranged at the bottom of the sliding block and is in sliding cooperation with the guide sliding groove, and the convex rib extends along the axial direction and is integrally formed with the sliding block.

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