A logging martin daque pollution prevention device

Abstract

The utility model relates to the oil well logging cable depth metering technical field, specifically relates to a kind of well logging martin daiker anti-pollution device, the device includes the device shell of the bottom for half-enclosed structure, and is connected with well logging martin daiker main body by fixed crossbeam, is installed in device shell bottom oil reservoir, one end is communicated with oil discharge pipeline, respectively be arranged in the frame of martin daiker measuring wheel border both sides, and with the adjustable scraper and guide wheel assembly of the spacing adjustable of measuring wheel, guide wheel assembly, including positive cable guide wheel and lateral cable guide wheel, respectively through wheel axle screw detachable installation at the cable of the device shell place, into position, reduce cable abrasion.The device realizes quick installation and maintenance by detachable component, and oil water caused by cable can be collected and the surface oil water of measuring wheel is cleaned.

Description

Technical Field

[0001] This utility model relates to the field of oilfield logging cable depth measurement technology, specifically to a logging Martin-Dike anti-pollution device. Background Technology

[0002] Martin-Dike is a core piece of equipment in the well logging industry used for precise measurement of depth and velocity. It consists of two measuring wheels, a depth photoelectric encoder, a cable tensioning device, and a centering wheel. During operation, the well logging cable is clamped between the two measuring wheels by the tensioning device and moves back and forth, thereby driving the depth photoelectric encoder to generate corresponding positive and negative pulse signals. These signals are converted into depth and velocity signals on the winch panel and then provided to the well logging surface instruments. In practical applications, Martin-Dike has been recognized by field well logging operators for its good working stability and high measurement accuracy.

[0003] Chinese utility model patent application CN218669339U discloses a novel multi-functional Martin-Dike logging system that solves the problem of ice formation by incorporating a de-icing unit through structural design. However, in practical applications, it has been found that crude oil and mud brought up from the well by the cable adhere to the measuring wheel and centralizing wheel. As the operation time increases, excessive accumulation of crude oil and mud drips into the instrument vehicle's rear compartment and onto the ground. Furthermore, the excessive distance between the scraper blades and the measuring wheel prevents them from effectively scraping away oil and mud. Especially in winter, the oil and water adhere to the measuring wheel and freeze, hardening, which can severely affect its normal operation, requiring cleaning to restore its functionality. Existing Martin-Dike systems have increased the environmental challenges of on-site construction and impacted operational efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a Martin-Dike logging anti-pollution device to address the shortcomings of the existing technology, thereby solving the technical problem that Martin-Dike logging is easily affected by oil and water pollution and fails during operation.

[0005] The objective of this utility model is achieved through the following technical solution: In a first aspect, this utility model provides a Martin-Dike well logging anti-pollution device, comprising: The device's outer casing has a semi-enclosed structure at the bottom, and is connected to the Martin-Dike logging main body via a fixed crossbeam; An oil storage tank is installed at the bottom of the device housing, and one end of the oil storage tank is connected to an oil drain pipe. Adjustable scrapers are respectively set on both sides near the edge of the Martin-Dick measuring wheel, and the distance between them and the measuring wheel is adjustable; The guide wheel assembly includes a forward cable guide wheel and a lateral cable guide wheel, which are detachably mounted on the cable entry and exit positions of the device housing via wheel axle screws, thereby reducing cable wear.

[0006] As a further improvement of this utility model, the fixed crossbeam is connected to the logging Martin-Dike main body and the device housing respectively through a detachable structure, which is a screw structure.

[0007] As a further improvement of this utility model, the number of fixed crossbeams is two, the two fixed crossbeams are arranged in parallel and symmetrically, and the positioning pins at both ends of the fixed crossbeams are adapted to the positioning holes of the Martin-Dick body and the outer shell of the device.

[0008] As a further improvement of this utility model, a drain valve is installed on the oil drain pipe.

[0009] As a further improvement of this utility model, the inner wall of the oil storage tank is provided with an anti-stick coating.

[0010] As a further improvement of this utility model, the number of adjustable scrapers is four, with one scraper on each side near the edge of each Martin-Dick measuring wheel, and the two adjustable scrapers are arranged in opposite directions.

[0011] As a further improvement of this utility model, the bottom of the device housing is provided with two side bottom plates, which are used to tilt at a set angle toward the oil storage tank.

[0012] As a further improvement of this utility model, the outer shell of the device is detachably provided with a support leg, and the horizontal adjustment bolts of the support leg have adjustment holes evenly distributed along the height direction of the support leg.

[0013] As a further improvement of this utility model, the outer circumference of the guide wheel is provided with anti-slip texture, the anti-slip texture is a spiral groove, and the curvature of the spiral groove is adapted to the outer diameter of the cable.

[0014] As a further improvement of this utility model, an oil-resistant sealing strip is attached to the inside of the device housing.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a Martin-Dike logging anti-pollution device, which forms an enclosure around the Martin-Dike measuring wheel and the surrounding area where oil and water droplets are prone to occur through a semi-enclosed structure. At the same time, the fixed crossbeam realizes the reliable assembly of the device shell and the Martin-Dike body. Compared with the existing technology where there is no enclosure structure, resulting in oil and water directly dripping into the instrument vehicle rear compartment and the ground, it can effectively prevent oil and water from overflowing, solve the problem of oil and water pollution diffusion, and the stable assembly relationship can prevent the device shell from shifting and affecting normal operation. The oil and water dripping from the area enclosed by the device's outer casing is collected by an oil storage tank and discharged centrally via an oil drain pipe. Compared to existing technologies where oil and water drip randomly and require frequent ground cleaning, this technology enables centralized collection and directional discharge of oil and water, reducing on-site cleaning workload and improving construction efficiency. The scraper blade directly contacts the measuring wheel surface to remove oil and water adhering to the wheel, and its adjustable spacing adapts to wear during use. Compared to existing technologies where the fixed or excessively large distance between the scraper blade and measuring wheel leads to ineffective scraping and ice formation in winter hindering wheel operation, this technology effectively removes oil and water from the measuring wheel surface, preventing ice blockage and eliminating the need for machine shutdown for cleaning, ensuring continuous normal operation of the measuring wheel and further improving construction efficiency. The cable is guided by the coordinated action of the forward and lateral guide wheels. The design avoids direct friction between the cable and the device housing, while the detachable design of the wheel axle screws facilitates the maintenance and replacement of the guide wheel. Compared to existing technologies where the absence of a guide wheel leads to severe cable wear and the non-removable guide wheel necessitates complete device disassembly for replacement, this significantly reduces cable wear and minimizes construction interruptions due to cable faults. Furthermore, the detachable installation method reduces maintenance time and improves maintenance efficiency. Through the synergistic action of the device housing, oil reservoir, adjustable scraper, and guide wheel assembly, a complete pollution prevention and efficiency improvement solution is formed from four dimensions: oil and water containment and blocking, centralized collection and discharge, oil and water removal from the measuring wheel, and cable wear protection. Compared to existing technologies that can only address issues such as icing or convenient installation, this solution simultaneously addresses the core technical problems of oil and water pollution and low construction efficiency, achieving a synergistic improvement in both pollution prevention and construction efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a bottom view of the Martin-Dike anti-pollution device for well logging in an embodiment of this utility model; Figure 2 This is a front view of the Martin-Dike anti-pollution device for well logging in an embodiment of this utility model; In the diagram, 1. Forward cable guide wheel; 2. Lateral cable guide wheel; 3. Fixed crossbeam; 4. Support leg; 5. Adjustable scraper; 6. Oil reservoir; 7. Drain valve; 8. Device housing. Detailed Implementation

[0018] To make the objectives and technical solutions of this utility model clearer and easier to understand, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The described embodiments are only some embodiments of this utility model, and not all embodiments.

[0020] Example 1 In oil and gas logging operations, the Martin-Dike rig, as a core depth measurement device, directly determines the reliability and accuracy of logging data. However, the logging environment is complex, and cables carrying downhole can accumulate large amounts of oil, mud, rock cuttings, and other contaminants. These contaminants easily adhere to the surface of the Martin-Dike measuring wheel and the inside of the rig, causing wear and slippage, leading to increased depth measurement errors, corrosion of components, shortening equipment lifespan, and increasing maintenance costs and downtime. To address these technical challenges, this invention provides a Martin-Dike logging anti-contamination device. Through a scientifically designed structure, it provides comprehensive anti-contamination protection for the Martin-Dike rig, ensuring the continuity of logging operations and data accuracy. The following specific embodiments illustrate this. like Figure 1 , Figure 2 As shown, this Martin-Dike well logging anti-pollution device is designed with source blocking, contaminant collection, and component protection as its core concepts. The overall structure comprises four core parts: the outer casing 8, the oil storage tank 6, the adjustable scraper 5, and the guide wheel assembly. These parts are rationally connected and coordinated to form a complete anti-pollution system. Furthermore, to enhance the device's practicality, stability, and maintainability, auxiliary components such as a fixed crossbeam 3, support legs 4, and oil-resistant sealing strips are also included. The specific characteristics of each component are as follows: The outer casing 8, serving as the carrier and fundamental barrier of the entire anti-pollution device, directly determines its basic effectiveness in preventing contamination. Made of high-strength alloy steel, the casing possesses excellent corrosion resistance, wear resistance, and impact resistance, enabling it to withstand the harsh environment of the logging site and preventing damage from collisions and corrosion that could render the anti-pollution function ineffective. The core bottom of the casing features a semi-enclosed structure, specifically a U-shaped opening facing the Martin-Dike measuring wheel. The inner edge of the semi-enclosed structure conforms to the outline of the Martin-Dike main body, allowing the casing to fit tightly against the outside of the Martin-Dike measuring wheel and surrounding components, forming a well-sealed protective space that prevents contaminants carried by the cable from spreading into the Martin-Dike device at the source.

[0021] To further enhance the anti-pollution effect and structural stability, an oil-resistant sealing strip is attached to the inside of the outer casing 8. This sealing strip is made of nitrile rubber, which has excellent oil resistance, sealing performance, and elasticity. The strip is tightly bonded to the inner wall of the casing using a special adhesive, with a gap of less than 0.5mm. The sealing strip covers the connection points between the casing and the Martin-Dike main body, as well as the seams between various components of the casing. This effectively prevents liquid contaminants such as oil and mud from seeping into the device through these gaps, while also preventing solid contaminants such as dust from accumulating in the gaps and becoming difficult to clean.

[0022] At the bottom of the outer casing, two side base plates are provided. These side base plates are integrally formed with the main body of the outer casing and manufactured using a stamping process to ensure structural strength. The two side base plates are located on either side of the oil storage tank 6. Their key feature is that they are tilted at a set angle towards the oil storage tank 6. The tilt angle can be adjusted between 5° and 30° according to actual usage requirements; in this embodiment, 30° is preferred. The tilted design of the side base plates allows contaminants adhering to the inner wall of the outer casing and the surface of the side base plates to automatically slide down into the oil storage tank 6 below under gravity, preventing contaminants from accumulating inside the outer casing and achieving active guided collection of contaminants. In this embodiment, the two side base plates are located on the left and right sides of the oil storage tank, integrally formed with the bottom of the device outer casing, and tilted towards the oil storage tank in a "V" shape.

[0023] In addition, the device housing 8 is detachably equipped with support legs 4, which are made of stainless steel and connected to the mounting base at the bottom of the housing by bolts. This allows for easy disassembly, maintenance, and replacement. A key feature of the support legs 4 is the presence of leveling bolts. These bolts have evenly distributed adjustment holes along the height of the support legs 4, spaced 20mm apart and 12mm in diameter. By inserting the adjusting bolts into the adjustment holes at different heights, the height of the support legs 4 can be finely adjusted from 0-100mm. This allows the device housing 8 to adapt to the installation height requirements of different Martin-Dick models, ensuring optimal protective clearance between the housing and the measuring wheel, while also guaranteeing the overall stability of the device. The four support legs are installed at the four corners of the bottom of the device housing (near the outer side of the bottom plate), avoiding the oil reservoir and drain pipe, and thus not interfering with the drainage and discharge processes.

[0024] As a core component connecting the outer casing 8 of the device to the Martin-Dike logging unit, the structural design of the fixed crossbeam 3 directly determines the installation stability and ease of disassembly of the device. The fixed crossbeam 3 is made of high-strength aluminum alloy, which, compared to traditional steel crossbeams, effectively reduces the overall weight of the device while ensuring structural strength, facilitating on-site installation and handling.

[0025] In this embodiment, there are two fixed crossbeams 3, which are arranged parallel and symmetrically on both sides of the device housing 8. The axis of symmetry coincides with the axis of the Martin-Dike measuring wheel. This arrangement makes the force on the crossbeams more even, avoiding device tilting or loosening due to excessive force on one side. The two ends of the fixed crossbeams 3 are respectively connected to the Martin-Dike logging body and the device housing 8 through a detachable structure. This detachable structure is a screw structure, specifically using M16×50 high-strength internal hexagon screws made of 304 stainless steel, which has good corrosion resistance and shear strength.

[0026] To improve the positioning accuracy and stability of the connection, positioning pins are installed at both ends of the fixed crossbeam 3. The positioning pins and the crossbeam are integrated, with a diameter of 10mm and a length of 20mm. Correspondingly, the Martin-Dick main body and the outer shell 8 of the device are provided with positioning holes that are adapted to the positioning pins. The diameter of the positioning holes is 10.2mm and the depth is 22mm. The fit clearance between the positioning pins and the positioning holes is 0.1-0.2mm, which enables the rapid positioning and installation of the crossbeam, avoids deviations during installation, and further improves the stability of the connection, preventing the screws from loosening due to vibration during operation.

[0027] As the core component for collecting oil, mud, and other contaminants, the oil storage tank 6's structural design directly determines the collection efficiency and ease of cleaning. Made of 3mm thick stainless steel, the tank boasts excellent corrosion and wear resistance, capable of withstanding long-term erosion from oil and mud, preventing tank damage and contaminant leakage. The oil storage tank is installed within the "U"-shaped structure at the bottom of the device's outer shell and is fixedly connected to the bottom of the shell via welding. The weld seam uses a full-weld process with a height of 5mm to ensure a tight seal and prevent contaminants from leaking through the weld seam. The oil storage tank 6 is installed in the center of the semi-enclosed structure at the bottom of the device's outer shell 1, with its length perfectly matching the length of the outer shell's bottom (fitting against the inner wall of the outer shell), for example, a width of 150mm and a depth of 80mm (5L volume).

[0028] The volume of the oil storage tank 6 is designed according to the size of the Martin-Dike device and the degree of contamination during operation. In this embodiment, the volume of the oil storage tank 6 is 5L. The length of the tank body is adapted to the length of the bottom of the device shell 8, the width is 150mm, and the depth is 80mm, which can meet the contaminant collection needs of a single logging operation. One end of the oil storage tank 6 is connected to an oil drain pipe, which is made of seamless steel pipe with a diameter of 25mm and a length of 100mm. The connection between the pipe and the oil storage tank 6 is a threaded connection, and the sealing joint is wrapped with PTFE tape to ensure airtightness. A drain valve 7 is installed on the drain pipe. The valve adopts a ball valve structure and is made of stainless steel. It is easy to operate and can realize the rapid discharge and shut-off of contaminants. The handle of the drain valve 7 is provided with anti-slip texture, which makes it easy for operators to operate quickly while wearing gloves. At the same time, the valve is provided with an opening indicator mark to clearly show the valve's open and closed status.

[0029] To prevent contaminants from adhering to the inner wall of the oil storage tank 6 and becoming difficult to clean, an anti-stick coating is applied to the inner wall of the oil storage tank 6. This coating is made of polytetrafluoroethylene (PTFE) and produced through a spraying process. The coating thickness is 0.1-0.2 mm, and the surface roughness Ra ≤ 0.8 μm. The PTFE coating has excellent non-stick properties, oil resistance, and high-temperature resistance, effectively preventing oil, mud, and other contaminants from adhering to the tank wall. This allows contaminants to quickly settle to the bottom of the tank. Furthermore, cleaning only requires draining through the oil drain pipe, eliminating the need for repeated wiping of the tank wall and greatly improving cleaning efficiency.

[0030] The adjustable scraper 5, as the core component for removing contaminants from the cable surface, directly determines the cleaning effect and cable protection effect through its structural design. The scraper is made of polyurethane, which has excellent elasticity, wear resistance, and oil resistance, effectively removing contaminants while avoiding scratches on the cable surface and protecting the cable insulation layer.

[0031] The adjustable scraper blades 5 consist of four blades, arranged as follows: one blade is placed on each side of the Martin-Dick measuring wheel frame, meaning each measuring wheel corresponds to two blades, arranged in opposite directions. "Opposite directions" specifically means that the blade of one scraper blade faces the cable inlet direction, while the blade of the other scraper blade faces the cable outlet direction. This arrangement ensures that the cable undergoes two scraping passes in different directions as it enters and exits the measuring wheel, guaranteeing thorough removal of contaminants from the cable surface and preventing contaminants from entering the contact area between the measuring wheel and the cable, thus avoiding measurement errors.

[0032] The adjustable distance between the scraper blade and the measuring wheel is its core feature. The specific adjustment structure is as follows: the scraper blade is connected to the device housing 8 via an adjustment bracket. The adjustment bracket has a long, narrow adjustment hole, 50mm long and 10mm wide. The scraper blade mounting base is connected to the adjustment bracket by bolts. After loosening the bolts, the scraper blade can be moved along the length of the adjustment hole, thereby adjusting the distance between the scraper blade and the measuring wheel. The adjustment range is 0.5-3mm. In actual use, the distance can be adjusted to the optimal state according to the cable diameter and the adhesion of contaminants, ensuring that the scraper blade fits tightly against the cable surface while avoiding cable wear or scraper blade damage due to excessively small distances. After adjustment, tightening the bolts will fix the scraper blade in place. The tightening torque of the bolts is 15-20 N·m, ensuring that the scraper blade will not shift due to vibration during operation.

[0033] As a core component for guiding cable routing and reducing cable wear, the guide wheel assembly's structural design directly determines the cable's operational stability and service life. This assembly includes a forward cable guide wheel 1 and a lateral cable guide wheel 2, which are detachably mounted on the device housing 8 at the cable entry and exit positions via wheel axle screws. The forward guide wheel is located on the side where the cable enters the device, guiding the cable into the measuring wheel in the correct direction; the lateral guide wheel is located on the side where the cable exits the device, adjusting the cable's exit direction to prevent direct contact between the cable and the device housing 8, thus avoiding wear.

[0034] The guide wheel is made of high-strength nylon, which has excellent wear resistance, shock absorption, and self-lubricating properties, effectively reducing the coefficient of friction between the cable and the wheel, thus minimizing cable wear. The outer circumference of the guide wheel is decorated with anti-slip grooves, which are spiral grooves. The curvature of these grooves matches the outer diameter of the cable. In this embodiment, the cable outer diameter is 20mm, corresponding to a groove curvature of R10, a groove pitch of 15mm, and a depth of 2mm. This spiral groove structure not only increases the friction between the guide wheel and the cable, preventing slippage during operation and ensuring smooth cable operation, but also positions the cable, preventing lateral deviation on the wheel and further reducing cable wear.

[0035] The guide wheel's axle is made of stainless steel, and the axle screw is an M12×30 hex socket head cap screw. A bearing, a deep groove ball bearing (model 6203), is installed between the screw and the axle to reduce friction between the axle and the screw, allowing for smoother rotation of the guide wheel. A dust cover made of rubber is installed on the axle screw mounting base to effectively prevent contaminants from entering the bearing, avoiding jamming and ensuring the normal operation of the guide wheel.

[0036] The specific technical principles are as follows: The semi-enclosed structure of the outer casing 8 fits snugly with the Martin-Dyck main body, forming a well-sealed protective space. This space encloses the Martin-Dyck measuring wheel and surrounding core components, spatially preventing direct contact between external contaminants and the core components. Oil-resistant sealing strips inside the casing further enhance the sealing of the protective space, preventing liquid contaminants from seeping into the device through gaps. Simultaneously, the side plate at the bottom of the casing is inclined towards the oil reservoir 6, allowing contaminants adhering to the inner wall of the casing to automatically slide into the oil reservoir 6 under gravity. This active guidance of contaminants prevents their accumulation inside the casing, reducing the risk of contamination to the Martin-Dyck device at its source.

[0037] The symmetrical arrangement of the fixed crossbeam 3 and the positioning pin structure ensure the stability of the connection between the device housing 8 and the Martin-Dike main body. This maintains the structural stability of the protective space in the vibration environment of well logging operations, preventing gaps in the protective space due to loose connections and ensuring the reliability of source protection. The height adjustment function of the support legs 4 allows the housing to adapt to different models of Martin-Dike devices, ensuring the adaptability of the protective space and further improving the source protection effect.

[0038] Before entering the Martin-Dike measuring wheel, the cable is first guided by the forward guide wheel to enter the working area of ​​the adjustable scraper 5 in the correct direction. Since the adjustable scraper 5 is arranged in both forward and reverse directions, the cable first contacts the scraper facing the infeed direction. The blade of this scraper is in close contact with the cable surface. During cable operation, the scraper performs an initial scraping of the cable surface, removing most of the oil, mud, and other contaminants adhering to the cable surface. Subsequently, the cable enters the measuring wheel for depth measurement. After the measurement is completed, the cable then contacts the scraper facing the outfeed direction. This scraper performs a second scraping of the cable surface from the opposite direction, removing any remaining contaminants, thus achieving a double cleaning of the cable surface.

[0039] The adjustable blade spacing allows the blades to be adjusted to their optimal working condition based on the cable diameter and contaminant adhesion, ensuring a good fit between the blades and the cable surface. This guarantees effective contaminant removal while preventing excessive pressure and wear on the cable. The spiral groove structure of the guide wheel assembly guides the cable smoothly, preventing slippage or deviation and ensuring the cable passes stably through the blade's effective area, thus improving cleaning efficiency.

[0040] After being cleaned by the adjustable scraper 5, contaminants, along with those sliding down the inner wall of the outer casing, fall into the oil storage tank 6 below under gravity. The non-stick coating on the oil storage tank 6 prevents contaminants from adhering to the tank walls, allowing them to quickly settle to the bottom for centralized storage. When the amount of contaminants in the oil storage tank 6 reaches a certain level, the operator can open the drain valve 7 on the drain pipe to quickly discharge the contaminants into a dedicated collection container, achieving centralized treatment and preventing indiscriminate discharge that could cause environmental damage.

[0041] The volume design of oil storage tank 6 is sufficient to meet the contaminant collection needs of a single well logging operation, preventing secondary pollution caused by contaminant overflow during the operation. The threaded connection and ball valve structure of the oil discharge pipeline ensure the sealing of the discharge process, preventing contaminant leakage and further improving the reliability of contaminant collection.

[0042] The high-strength nylon material and spiral groove structure of the guide wheel assembly reduce the coefficient of friction between the cable and the guide wheel, thus reducing cable wear. The use of deep groove ball bearings makes the guide wheel rotate more flexibly, further reducing friction loss. The high-strength materials of the device housing 8 and the fixed crossbeam 3 can withstand the impact and corrosion at the logging site, preventing damage to the device itself. The stainless steel material and anti-stick coating of the oil storage tank 6 enhance its corrosion resistance and anti-pollution ability, extending the service life of the components.

[0043] The design of the detachable structure (such as the wheel axle screws of the guide wheel, the screw connection of the fixed crossbeam 3, and the bolt connection of the support leg 4) makes it easy to disassemble and maintain each component. When a component is worn or damaged, it can be quickly replaced, avoiding the failure of the entire device due to the failure of a single component, thus improving the reliability and service life of the device.

[0044] The implementation process of this Martin-Dike pollution prevention device for well logging includes five core stages: device assembly, on-site installation, parameter debugging, operation, and maintenance. Each stage has clear operating procedures and technical requirements to ensure that the device can be put into use smoothly and achieve the best pollution prevention effect. The specific implementation process is as follows: The assembly of the device takes place in the ground workshop. Before assembly, all components must undergo quality inspection to ensure that they are undamaged and that their dimensions meet design requirements. The specific assembly steps are as follows: The oil-resistant sealing strips are adhered to the inner wall and joints of the outer casing 8 using a special adhesive. During adhesion, ensure the strips are flat and free of air bubbles. After adhesion, allow 24 hours to allow the adhesive to fully cure. Then, the two side base plates are welded to the main casing using a full-weld process. After welding, the weld seams are ground to ensure they are smooth and burr-free.

[0045] The oil storage tank 6 is placed into the "U"-shaped structure at the bottom of the outer casing 8. The position of the oil storage tank 6 is adjusted to ensure a tight fit between the oil storage tank 6 and the bottom of the outer casing. Then, the oil storage tank 6 is fixedly connected to the outer casing by welding. After welding, the weld is tested for sealing using a water pressure test at a pressure of 0.1 MPa for 5 minutes. No leakage is considered acceptable. Subsequently, a polytetrafluoroethylene (PTFE) anti-stick coating with a thickness of 0.15 mm is sprayed onto the inner wall of the oil storage tank 6. After spraying, it is cured at 180°C for 2 hours.

[0046] Install the forward guide wheel and the side guide wheel on the cable inlet and outlet positions of the device housing 8 respectively using wheel axle screws. During installation, first install a deep groove ball bearing between the wheel axle and the screw, then tighten the screw to a torque of 18 N·m, and finally install the dust cover, ensuring that the dust cover fits tightly with the mounting base.

[0047] Install the four polyurethane scraper blades on the adjustment bracket and fix them with bolts. Then install the adjustment bracket on the outer shell 8 of the device near the measuring wheel, ensuring that the scraper blades are located on both sides of the measuring wheel frame. After installation, make preliminary adjustments to the position of the scraper blades so that the distance between the scraper blades and the measuring wheel is about 2mm.

[0048] Two fixed crossbeams 3 are connected to the device housing 8 via locating pins. After the locating pins are inserted into the locating holes, the crossbeams are fixed to the housing with M16 hex socket screws, with a tightening torque of 30 N·m. Then, the support legs 4 are installed on the mounting base at the bottom of the housing with bolts, and the height of the support legs 4 is initially adjusted according to actual needs.

[0049] Connect the oil drain pipe to the outlet of the oil storage tank 6 via a threaded connection. Wrap the connection with PTFE tape to ensure a tight seal. Then install the drain valve 7 on the oil drain pipe. After closing the valve, perform a seal test to ensure there is no leakage.

[0050] After assembly, a comprehensive inspection of the entire device is carried out, including the connection stability of each component, the flexibility of the scraper, the rotation of the guide wheel, and the sealing of the seven drain valves, to ensure that all components meet the usage requirements.

[0051] On-site installation is carried out at the well logging operation site. Before installation, the surface of the Martin-Dike unit must be cleaned to remove oil, dust, and other contaminants, ensuring a clean installation surface. The specific installation steps are as follows: 1. Device Positioning: Hoist the assembled anti-pollution device above the Martin-Dick device, adjust the position of the device so that the semi-enclosed structure of the device shell is aligned with the Martin-Dick measuring wheel and surrounding components, and ensure that the position of the guide wheel is consistent with the direction of the cable.

[0052] 2. Fixed connection: Align the positioning pins at both ends of the fixed crossbeam 3 with the positioning holes of the Martin-Dick body, insert the positioning pins into the positioning holes to achieve the positioning of the device, and then fix the fixed crossbeam 3 to the Martin-Dick body with M16 hex socket screws. The tightening torque is 30 N·m. After tightening, check the stability of the connection to ensure that there is no looseness.

[0053] 3. Support leg adjustment: Adjust the height of the support legs according to the installation height of the Martin-Dick device and the ground conditions on site. Insert the leveling bolts into the adjustment holes at different heights to keep the device casing level. After adjustment, tighten the bolts to fix the position of the support legs.

[0054] 4. Cable threading: Thread the logging cable through the forward guide wheel, adjustable scraper, measuring wheel, and lateral guide wheel in sequence. During the threading process, ensure that the cable is located in the spiral groove of the guide wheel to avoid direct contact between the cable and the device housing.

[0055] After on-site installation is completed, a preliminary trial run is conducted. The cable is manually pulled to check its operation, the fit between the scraper and the cable, and the rotation of the guide wheel, to ensure that the device is installed correctly.

[0056] Parameter debugging is a crucial stage to ensure the device performs at its best. Debugging mainly includes adjusting the scraper spacing, adjusting the guide wheel position, and checking the sealing performance. Specific debugging steps are as follows: Based on the cable diameter used on site (20mm in this embodiment), loosen the bolts on the scraper adjustment bracket, move the scraper to ensure it is in close contact with the cable surface, and adjust the gap to approximately 0.8mm. After adjustment, tighten the bolts to a torque of 18 N·m. After adjustment, manually pull the cable to check the scraping effect of the scraper on the cable surface, ensuring that contaminants are effectively removed and that the cable surface is free of scratches.

[0057] Loosen the axle screws of the guide wheel and adjust the position of the guide wheel so that the cable can enter the measuring wheel in a straight line under the guidance of the guide wheel, avoiding bending or deviation of the cable. After adjustment, tighten the axle screws to ensure that the position of the guide wheel is fixed.

[0058] Pour a small amount of clean water (about 1L) into the oil storage tank and observe whether there is any water leakage at the sealing strip of the outer shell and the weld of the oil storage tank. At the same time, open the drain valve and check the drainage of the oil drain pipe to ensure that there is no blockage or leakage.

[0059] Start the Martin-Dick device, perform depth measurement calibration, compare the device's measurement data with standard depth data, adjust the device's position, and ensure that the measurement accuracy meets the requirements (error ≤ ±0.1%).

[0060] After the parameters are debugged, record the debugging parameters (including the blade spacing, guide wheel position, support leg height, etc.) to provide a basis for subsequent maintenance and adjustment.

[0061] The operational phase is the core stage for the device to play its pollution prevention role. During logging operations, operators need to monitor the device's operating status in real time to ensure its normal operation. Specific operational requirements are as follows: During operation, operators need to inspect the device every 30 minutes, focusing on the scraping effect of the scraper, the rotation of the guide wheel, the operating status of the cable, and the collection of contaminants in the oil storage tank. Any problems found should be dealt with promptly.

[0062] Observe the cleanliness of the cable surface. If a lot of contaminants are found on the cable surface, it means that the scraper spacing is too large. The machine should be stopped in time to adjust the scraper spacing and reduce it appropriately (to 0.5-0.8mm). If scratches are found on the cable surface, it means that the scraper spacing is too small and the spacing needs to be increased.

[0063] Ensure that the guide wheel rotates freely without any jamming. If the guide wheel is found to rotate slowly, stop the machine immediately for inspection, remove contaminants from the guide wheel and bearings, and add lubricating oil if necessary.

[0064] Observe the level of contaminants in the oil storage tank. When the level reaches 2 / 3 of the tank's volume (approximately 3.3L), promptly open the drain valve to discharge the contaminants into a dedicated collection container. After discharge, close the valve to ensure a seal.

[0065] If any unexpected situation occurs during operation, such as cable breakage or damage to equipment components, the machine must be stopped immediately, the power supply cut off, and emergency measures taken to prevent the accident from escalating.

[0066] During operation, it is necessary to keep good operation records, including operation time, pollutant emissions, equipment operating status, problems encountered and handling measures, etc., to provide data support for subsequent maintenance and optimization.

[0067] Based on the operating status of the equipment, a comprehensive maintenance and cleaning should be carried out every 30 days of operation. The specific maintenance and cleaning steps are as follows: After logging operations are completed, the machine is shut down and the power supply to the Martin-Dike unit is disconnected to ensure safety during maintenance.

[0068] Open the drain valve of the oil storage tank to completely discharge the contaminants into the special collection container. After discharge, close the valve, inject an appropriate amount of clean water into the oil storage tank, soak for 10 minutes, and then discharge again to rinse the oil storage tank and ensure that there are no residual contaminants in the tank.

Claims

1. A Martin-Dike well logging anti-pollution device, characterized in that, include: The device's outer casing has a semi-enclosed structure at the bottom, and is connected to the Martin-Dike logging main body via a fixed crossbeam; An oil storage tank is installed at the bottom of the device housing, and one end of the oil storage tank is connected to an oil drain pipe. Adjustable scrapers are respectively set on both sides near the edge of the Martin-Dick measuring wheel, and the distance between them and the measuring wheel is adjustable; The guide wheel assembly includes a forward cable guide wheel and a lateral cable guide wheel, which are detachably mounted on the cable entry and exit positions of the device housing via wheel axle screws, thereby reducing cable wear.

2. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The fixed crossbeam is connected to the main body of the logging Martin-Dike and the outer shell of the device via a detachable structure, which is a screw structure.

3. The Martin-Dike pollution prevention device for well logging according to claim 2, characterized in that, The number of fixed crossbeams is two, and the two fixed crossbeams are arranged in parallel and symmetrically. The positioning pins at both ends of the fixed crossbeams are adapted to the positioning holes of the Martin-Dick body and the outer shell of the device.

4. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, A drain valve is installed on the oil drain pipe.

5. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The inner wall of the oil storage tank is provided with an anti-stick coating.

6. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The number of adjustable scrapers is four, with one scraper on each side near the edge of each Martin-Dick measuring wheel, and the two adjustable scrapers are arranged in opposite directions.

7. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The bottom of the device housing is provided with two side bottom plates, which are used to tilt at a set angle toward the oil storage tank.

8. The Martin-Dike pollution prevention device for well logging according to claim 7, characterized in that, The device housing is detachably equipped with support legs, and the horizontal adjustment bolts of the support legs have adjustment holes evenly distributed along the height direction of the support legs.

9. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The outer circumference of the guide wheel is provided with anti-slip texture, which is a spiral groove, and the curvature of the spiral groove is adapted to the outer diameter of the cable.

10. The Martin-Dike pollution prevention device for well logging according to claim 1, characterized in that, The device housing is fitted with an oil-resistant sealing strip.

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