Near-bit azimuth gamma measurement-while-drilling tool antenna glue sealing method

Abstract

The invention provides a near-bit azimuth gamma measurement-while-drilling tool antenna sealing method, which comprises the following specific steps of: 1, designing and processing a sealing tool according to the size of an antenna to be sealed; step 2, spraying a zirconium oxide insulating layer on the antenna winding groove; 3, mounting an antenna power line with a sealing plug in the antenna power line mounting hole; step 4, mounting a magnetic ring; step 5, sealing the magnetic ring with glue; step 6, winding an enameled wire; 7, welding the enameled wire with an antenna power line; 8, sealing the enameled wire with glue; 9, installing a corresponding antenna inner cylinder, a sealing ring, a check ring and an antenna outer cover outside the enameled wire; 10, sealing the outer cover of the antenna with glue; and step 11, after the sealing of the antenna outer cover is finished, carrying out a pressing test. According to the invention, the influence of personal technical level difference on the sealing quality is eliminated, the service life of the antenna in the well is prolonged, the antenna is safe and reliable, and the measurement precision is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of measurement-while-drilling in oil and gas drilling, and particularly relates to a method for sealing glue of an antenna of a near-bit azimuth gamma measurement-while-drilling tool. Background Art

[0002] Near-bit azimuth gamma is a new type of geosteering measurement-while-drilling technology developed in recent years. Compared with conventional natural gamma, it can not only distinguish the formation lithology on both sides of the formation interface, but also accurately determine the relative position relationship of the formations on both sides of the interface, and has obvious effects in improving the reservoir encounter rate and drilling efficiency, optimizing the wellbore trajectory, reducing downhole geological risks, etc. With the exploration and development of complex reservoir oil and gas resources and unconventional resources such as shale oil and gas and tight oil and gas, it has broad application prospects. At present, near-bit azimuth gamma at home and abroad generally consists of two parts: a measurement and emission sub-section and a receiving sub-section. Its connection method in the BHA is generally "bit + near-bit azimuth gamma measurement and emission sub-section + screw drill + drill string check valve + (stabilizer) + near-bit azimuth gamma receiving sub-section + non-magnetic drill collar and MWD". In order to realize the short-distance transmission of azimuth gamma data and near-bit well inclination data across the screw drill between the measurement and emission sub-section and the receiving sub-section, it is necessary to design and install a data emission antenna on the measurement and emission sub-section and a data receiving antenna on the receiving sub-section.

[0003] Under the current technical conditions, in order to meet the functional requirements, the insulation resistance between the antenna and the near-bit azimuth gamma tool body should be greater than 500 MΩ. Therefore, non-metallic materials should be used and metal materials cannot be used. At the same time, in the measurement-while-drilling operation of oil and gas drilling, the antenna of near-bit azimuth gamma works under harsh working conditions such as high temperature, high pressure, high vibration, and strong erosion. Compared with metal materials, the service life and erosion resistance of non-metallic materials are much lower than those of metal materials. Therefore, higher requirements are put forward for the antenna processing and manufacturing process.

[0004] The publication number CN107599270A discloses an antenna array surface glue-sealing colloid shaping device, including: a handheld part, a connecting part is provided at the front end of the handheld part, and the handheld part and the connecting part are integrally formed; a shaping part, the shaping part is sleeved outside the connecting part and is used for shaping the glue-sealing. The glue-sealing colloid shaping device of the present invention sleeved the shaping part at the front end of the handheld part, and the shaping part is used to process the phenomena of non-smooth, uneven, and burrs on the glue-sealing colloid. Compared with the existing manual shaping method, by using the glue-sealing colloid shaping device of the present invention, the appearance of the glue-sealing at the joint can be made consistent, beautiful, the shaping efficiency is increased by 50%, the glue-sealing production cycle is greatly shortened, the problem of inconsistent and unbeautiful appearance of the colloid that has been criticized for a long time is solved, and the quality hidden danger in the glue-sealing process is reduced.

[0005] At present, the near-bit azimuth gamma logging-while-drilling (LWD) tool in China is still in the research and experimental application stage as a whole, and only a few domestic manufacturers have the research and development capabilities. Specifically, in terms of the sealing glue for the near-bit azimuth gamma antenna, there are problems such as non-standard sealing glue methods, lack of systematic operating procedures and standards. Most of the operations are completed manually. There are difficulties in the sealing glue process, such as irregular sealing glue shapes, easy inclusion of air bubbles in the glue, and low production efficiency, which lead to a series of problems, such as being unfavorable for antenna winding and turn number recording, uncertain antenna parameters, insufficient antenna pressure-bearing capacity, increased risk of antenna failure underground, and large measurement errors in gamma and well inclination. Summary of the Invention

[0006] In order to overcome the problems of irregular sealing glue shapes, easy inclusion of air bubbles in the glue, and low production efficiency in the existing sealing glue process, the present invention provides a method for sealing glue for the antenna of a near-bit azimuth gamma logging-while-drilling tool. The present invention seals the glue through a variety of designed processing and sealing glue toolings, improves the sealing glue quality of the antenna of the near-bit azimuth gamma logging-while-drilling tool, not only basically eliminates the influence of individual technical level differences on the sealing glue quality, but also increases the service life and safety reliability of the antenna underground, and ensures the measurement accuracy.

[0007] The technical solution adopted by the present invention is as follows: A method for sealing glue for the antenna of a near-bit azimuth gamma logging-while-drilling tool, and the specific steps are as follows: Step 1: Design and process a sealing glue tooling according to the size of the antenna to be sealed with glue; Step 2: Spray a zirconia insulation layer at the antenna winding groove, and manually polish and trim the coating thickness with sandpaper after spraying; Step 3: Install the antenna power line with a sealing plug in the antenna power line installation hole. After installation, conduct an insulation resistance test between the antenna power line and the near-bit azimuth gamma logging-while-drilling tool body. If it is greater than 500 MΩ, it is qualified; Step 4: Install a magnetic ring; Step 5: Seal the magnetic ring with glue; Step 6: Wind enameled wire at the magnetic ring; Step 7: Weld the enameled wire to the antenna power line; Step 8: Seal the enameled wire with glue; Step 9: Install the corresponding antenna inner cylinder, sealing ring, retaining ring and antenna outer cover outside the enameled wire; Step 10: Seal the antenna outer cover with glue; Step 11: Conduct a pressure test after the sealing of the antenna outer cover is completed.

[0008] The sealing glue tooling includes a magnetic ring sealing glue tooling, an enameled wire sealing glue tooling and an antenna outer cover sealing glue tooling.

[0009] In step 4, the specific method of installing the magnetic ring is as follows: evenly apply glue on the zirconia coating, and evenly stick the magnetic ring on the surface of the zirconia coating. When sticking, use a thickness feeler gauge to adjust the gap size between adjacent magnetic rings to 0.5mm±0.05mm.

[0010] In the step 5, the specific steps of sealing the magnetic ring are as follows: First, surround the magnetic ring with a magnetic ring sealing tool. The inner wall of the magnetic ring sealing tool is coated with silicone grease, and the outside is fixed with tape. All gaps where glue may overflow are sealed with sealant. Second, prepare the epoxy glue and put it in a vacuum box to degas for at least 30 minutes, then pour it from the glue inlet of the magnetic ring sealing tooling. When a small amount of epoxy glue overflows from the glue outlet, stop injecting the glue and let it stand for at least 30 minutes to solidify. Third, put the antenna part together with the near-drilling azimuth gamma while drilling measurement tool body into a high-temperature box, and solidify them statically at 75-85°C for at least 6 hours. Then take out the near-drilling azimuth gamma while drilling measurement tool body from the high-temperature box, and remove the sealing tooling after natural cooling.

[0011] The magnetic ring sealing tooling is composed of a left half ring and a right half ring. When in use, the two half rings are combined into a hollow cylindrical shape. A glue inlet is provided on one side of the magnetic ring sealing tooling, and a glue outlet is provided on the other side. Wire grooves and oblique openings are designed on both sides of the inner hole. The oblique openings are fitted with both ends of the antenna groove of the antenna connector for positioning the magnetic ring sealing tooling. Pre-proportioned epoxy glue is injected through the right opening. The left side is an exhaust port. After the sealing is completed, wire grooves on both sides are generated to facilitate subsequent winding.

[0012] In step 6, the specific steps of winding the enameled wire are as follows: The first step is to install the near-drill bit near-drilling azimuth gamma while-drilling measurement tool body onto the winding tooling after the magnetic ring is sealed with glue; The second step is to install the enameled wire on the winding roller of the winding tool, and lead the wire out from the lower end; The third step is to make the enameled wire flush with the end face of the magnetic ring sealant near the antenna power line installation hole. After leaving 8cm-12cm of the connector lead, start winding along the circumference of the magnetic ring sealant surface. After manually winding a few turns, turn on the rotating part of the winding tooling and automatically wind at a speed of 15-25 rpm; until it is wound flush with the other end face of the magnetic ring sealant, one layer of winding is completed, and the surface of the layer of epoxy glue is evenly applied; Step 4: Without cutting the enameled wire, start to wind it back in two layers. After the second layer is wound, evenly apply epoxy glue, then wind it back in the third layer, and so on. Repeat this process until the enameled wire is wound in n layers. Step 5: After winding the nth layer, which is the last circle, leave at least 10cm of connector lead wire, cut the enameled wire, and then evenly apply the last layer of epoxy glue on the surface of the nth layer; Step 6: Test the resistance, inductance and insulation resistance at both ends of the enameled wire and make sure they meet the requirements.

[0013] In step 7, the steps of welding the antenna power line and the enameled wire are as follows: Remove the insulation layer of the positive power line and the negative power line to the same height as the nth layer of enameled wire, and spread it flat to the outermost layer of the enameled wire; remove 10mm of insulation layer from the two wiring leads of the enameled wire, weld the wiring lead of the first layer of enameled wire to the negative power line by wrapping welding, and weld the wiring lead of the nth layer of enameled wire to the positive power line by wrapping welding; place highland barley paper under the welding point for insulation protection, and use epoxy resin glue to coat the antenna power line and the enameled wire and fix them on the surface of the nth layer of enameled wire.

[0014] In the step eight, the steps of sealing the enameled wire are as follows: In the first step, only the sealing ring is installed in the sealing ring groove on the body of the near-drilling azimuth gamma measurement while drilling tool without the retaining ring; The second step is to install the enameled wire sealing tooling and the sealing auxiliary system, with the enameled wire sealing tooling's glue inlet at the bottom and the air extraction port at the top; Step 3: Prepare epoxy glue and put it into a vacuum box for degassing for at least 30 minutes; The fourth step is to pour the prepared epoxy glue into the glue sealing tank, open the exhaust port valve of the enameled wire glue sealing tool, turn on the vacuum pump to pump to -0.1MPa, open the glue inlet valve of the enameled wire glue sealing tool for negative pressure glue sealing, and stop injecting glue when epoxy glue appears in the exhaust pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 5: Allow the glue to solidify for at least 30 minutes, then place the antenna part and the near-drilling azimuth gamma measurement while drilling tool body into a high-temperature box and allow it to solidify for at least 6 hours at 75-85°C. Step 6. Take out the near-drilling azimuth gamma measurement while drilling tool body from the high-temperature box, remove the sealing tool after natural cooling, and check whether the outer diameter size and Shore hardness of the sealing are qualified.

[0015] In the above step 10, the specific steps of sealing the antenna cover are as follows: The first step is to install the antenna cover glue sealing tooling and the glue sealing auxiliary system. The glue inlet of the antenna cover glue sealing tooling is at the bottom and the air extraction port is at the top; The second step is to prepare epoxy glue and put it into a vacuum box for degassing for at least 30 minutes; The third step is to pour the prepared epoxy glue into the sealing tank, open the exhaust port valve of the antenna cover sealing tool, start the vacuum pump to pump to -0.1MPa, open the glue inlet valve of the antenna cover sealing tool for negative pressure sealing, and stop injecting glue when epoxy glue appears in the exhaust pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 4: Let the glue solidify for at least 30 minutes, then put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body into a high-temperature oven and let it stand for 6 hours at 75 - 85°C for curing; Step 5: Take out the near-bit azimuth gamma logging-while-drilling tool body from the high-temperature oven, remove the antenna cover sealing glue tooling after natural cooling, and measure the hardness of the sealed glue with a portable Shore hardness tester. A Shore hardness of 90 - 95 is qualified; Step 6: Measure the resistance, inductance, and insulation resistance between the positive and negative power supply lines. The resistance between the positive and negative power supply lines is 25 ± 2 Ω, the inductance between the positive and negative power supply lines is 155 ± 15 mH, and the insulation resistance between the positive and negative power supply lines and the near-bit azimuth gamma logging-while-drilling tool body is > 500 MΩ to be qualified.

[0016] In the above-mentioned step 2, the unilateral thickness of the sprayed zirconia insulation layer is 0.2 mm - 0.3 mm.

[0017] Advantages of the present invention: By adopting measures such as special tooling equipment, standardized operating procedures, and sealant ratio, the present invention improves the sealant quality of the antenna of the near-bit azimuth gamma logging-while-drilling tool, not only basically eliminates the influence of individual technical level differences on the sealant quality, but also increases the service life and safety reliability of the antenna underground, and ensures the measurement accuracy.

[0018] The sealant method for the antenna of the near-bit azimuth gamma logging-while-drilling tool provided by the present invention greatly improves the production efficiency, has strong feasibility and popularization, and lays a foundation for industrial production.

[0019] The present invention can be used for sealant of the antenna of the near-bit azimuth gamma logging-while-drilling tool with series sizes such as 4.75 〃 and 6.75 〃 etc., and has good versatility. Brief Description of the Drawings

[0020] The present invention will be further described in detail below with reference to the drawings.

[0021] Figure 1 It is a schematic structural diagram of the antenna of the near-bit azimuth gamma logging-while-drilling tool.

[0022] Figure 2 It is a schematic diagram of spraying the zirconia insulation layer.

[0023] Figure 3 It is a schematic structural diagram of the magnetic ring sealant tooling.

[0024] Figure 4 It is a schematic structural diagram of the enameled wire winding tooling.

[0025] Figure 5 It is a schematic structural diagram of the enameled wire sealant tooling.

[0026] Figure 6 It is a schematic structural diagram of the sealing glue tooling for the antenna radome.

[0027] Figure 7 It is a schematic structural diagram of the sealing glue auxiliary system.

[0028] In the figure, the reference numerals are: 1. Near-bit azimuth gamma while-drilling measurement tool body; 2. Antenna radome; 3. Antenna inner cylinder; 4. Enameled wire; 5. Magnetic ring; 6. Retaining ring; 7. Sealing ring; 8. Antenna power supply wire installation hole. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the drawings, various structural schematic diagrams according to the disclosed embodiments of the present invention are shown. These figures are not drawn to scale, and for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are only exemplary. In practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] Embodiment 1: In order to overcome the problems existing in the existing sealing glue process, such as irregular sealing glue shape, easy inclusion of air bubbles in the colloid, and low production efficiency, the present invention provides a method for sealing glue for the antenna of a near-bit azimuth gamma while-drilling measurement tool as shown in Figure 1-7 By using a variety of designed processing and sealing glue toolings for sealing glue, the present invention improves the sealing glue quality of the antenna of the near-bit azimuth gamma while-drilling measurement tool, not only basically eliminates the influence of individual technical level differences on the sealing glue quality, but also increases the service life and safety reliability of the antenna underground, and ensures the measurement accuracy.

[0032] A method for sealing glue for the antenna of a near-bit azimuth gamma while-drilling measurement tool, the specific steps are as follows: Step 1: Design and process the sealing glue tooling according to the size of the antenna to be sealed. Step 2: Spray a zirconia insulating layer at the antenna winding groove, and after spraying, manually polish and trim the coating thickness with sandpaper. Step 3: Install the antenna power cable with a sealing plug in the antenna power cable installation hole 8. After installation, perform an insulation resistance test between the antenna power cable and the near-bit azimuth gamma logging-while-drilling tool body 1. A value greater than 500 MΩ is considered qualified; Step 4: Install the magnetic ring 5; Step 5: Seal the magnetic ring 5 with glue; Step 6: Wind the enameled wire 4 around the magnetic ring 5; Step 7: Weld the enameled wire 4 to the antenna power cable; Step 8: Seal the enameled wire 4 with glue; Step 9: Install the corresponding antenna inner cylinder 3, sealing ring 7, retaining ring 6 and antenna outer cover 2 outside the enameled wire 4; Step 10: Seal the antenna outer cover 2 with glue; Step 11: After the antenna outer cover 2 is sealed with glue, perform a pressure test.

[0033] As Figure 1 shown, between the antenna inner cylinders 3 at the spraying parts of the near-bit azimuth gamma logging-while-drilling tool body 1, there are a magnetic ring 5 and an enameled wire 4. The enameled wire 4 is connected to the lead-out joint of the antenna inner cylinder 3. Inside the antenna inner cylinder 3, there are a sealing ring 7 and a retaining ring 6; in the antenna power cable installation hole 8, there are an antenna power cable and a sealing plug, and the antenna power cable is connected to the lead-out joint of the enameled wire 4. The antenna outer cover 2 is arranged outside the two ends of the antenna inner cylinder 3, and the outer wall of the antenna outer cover 2 is flush with the outer wall of the near-bit azimuth gamma logging-while-drilling tool body 1; the middle part of the near-bit azimuth gamma logging-while-drilling tool body 1 is a channel.

[0034] In the present invention, the function of the antenna power cable is to provide current for the antenna. There are two power cables, one is the positive wire and the other is the negative wire, forming a complete power supply circuit for the antenna. The sealing plug seals and separates the antenna winding groove from the circuit part at the other end of the antenna power cable installation hole 8, preventing drilling fluid from entering the inside of the near-bit azimuth gamma logging-while-drilling tool body 1 along the hole of the antenna power cable installation hole 8 in case the antenna glue seal is damaged during downhole operations.

[0035] In the present invention, through the corresponding sealing fixtures for the installation of the corresponding structures, the sealing quality of the antenna of the near-bit azimuth gamma logging-while-drilling tool is improved. It not only basically eliminates the influence of individual technical level differences on the sealing quality, but also increases the service life and safety reliability of the antenna in the well, and ensures the measurement accuracy. The present invention improves the production efficiency, has strong feasibility and popularization, and lays a foundation for industrial production. The present invention is used for sealing the antenna of the near-bit azimuth gamma logging-while-drilling tool with series sizes such as 4.75 〃 and 6.75 〃 etc., and has good versatility.

[0036] Example 2: Based on Embodiment 1, in this embodiment, preferably, the potting tooling includes a magnetic ring potting tooling, an enameled wire potting tooling, and an antenna cover potting tooling.

[0037] Preferably, in Step 4, the specific method for installing the magnetic ring 5 is as follows: Apply glue evenly on the zirconia coating, and paste the magnetic ring 5 evenly on the surface of the zirconia coating. When pasting, use a thickness gauge to adjust the gap between adjacent magnetic rings 5 to be 0.5 mm ± 0.05 mm.

[0038] Preferably, in Step 2, the single-sided thickness of the sprayed zirconia insulating layer is 0.2 mm - 0.3 mm.

[0039] In the present invention, a zirconia insulating layer is sprayed at the antenna winding groove. The thickness of the sprayed zirconia insulating layer is uniform, without defects such as peeling and cracks. The insulation resistance between the zirconia insulating layer and the near-bit azimuth gamma logging-while-drilling tool body 1 is greater than 100 MΩ. After spraying, manually polish and trim the coating thickness with sandpaper. After polishing and correction, the single-sided thickness is 0.2 - 0.3 mm.

[0040] Preferably, in Step 5, the specific steps for potting the magnetic ring 5 are as follows: First, surround the magnetic ring 5 with the magnetic ring potting tooling. The inner wall of the magnetic ring potting tooling is coated with silicone grease and fixed with tape on the outside. Sealant is applied to seal all possible glue-overflowing gaps. Second, prepare epoxy glue and put it into a vacuum chamber for degassing for at least 30 minutes. Pour it in from the glue inlet of the magnetic ring potting tooling. Stop injecting glue when a small amount of epoxy glue overflows from the glue outlet, and let it stand for at least 30 minutes to solidify the glue. Third, put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body 1 into a high-temperature oven and let it stand for curing at 75 - 85 °C for at least 6 hours. Then take out the near-bit azimuth gamma logging-while-drilling tool body 1 from the high-temperature oven and remove the potting tooling after natural cooling.

[0041] In the present invention, applying silicone grease on the inner wall of the magnetic ring potting tooling facilitates demolding, and it is fixed with tape (fiberglass tape) on the outside. Sealant is applied to seal all possible glue-overflowing gaps. In the present invention, when pasting the magnetic rings, use a 0.5-mm-thick steel sheet to adjust the gap between adjacent magnetic rings 5 to be 0.5 mm, and the error value of the gap size is ±0.05 mm.

[0042] In the present invention, the epoxy glue prepared during the potting process of the magnetic ring 5 is a two-component epoxy glue, and its total weight is configured according to requirements. The two-component epoxy glue includes a curing agent and a heat-resistant epoxy potting material. The weight ratio of the curing agent to the heat-resistant epoxy potting material is 5:1. Only when the curing agent and the heat-resistant epoxy potting material are mixed can the performance indicators such as mechanical strength, insulation, and resistance to thermal shock after curing meet the practical requirements.

[0043] Preferably, the magnetic ring sealing tooling consists of a left half ring and a right half ring. When in use, the two half rings are combined into a hollow cylindrical shape. A glue inlet is provided on one side of the magnetic ring sealing tooling, and a glue outlet is provided on the other side. Wire grooves and bevels are designed on both sides of the inner hole. The bevels are fitted with both ends of the antenna groove of the antenna connector for positioning the magnetic ring sealing tooling. Pre-mixed epoxy glue is injected through the right opening. The left side is an exhaust port. After sealing is completed, wire grooves on both sides are generated to facilitate subsequent winding.

[0044] like Figure 3 As shown, Figure 3 In the figure, (a) is the main view, and (b) is the top view. The magnetic ring glue sealing tool consists of a left half ring and a right half ring. When in use, the two half rings are combined into a hollow cylindrical shape. A glue inlet is provided on one side of the magnetic ring glue sealing tool, and a glue outlet is provided on the other side.

[0045] Preferably, in step six, the specific steps of winding the enameled wire 4 are as follows: In the first step, after the magnetic ring 5 is sealed with glue, the near-drilling azimuth gamma while-drilling measurement tool body 1 is installed on the winding tooling; The second step is to install the enameled wire 4 on the winding roller of the winding tool, and lead the wire out from the lower end; The third step is to make the enameled wire 4 flush with the end face of the sealant of the magnetic ring 5 near the antenna power line installation hole 8, leaving 8 cm -12 cm of the connector lead, and then start winding along the circumference of the sealant surface of the magnetic ring 5. After manually winding a few turns, turn on the rotating part of the winding tooling, and automatically wind at a speed of 15-25 rpm; until it is wound flush with the other sealant end face of the magnetic ring 5, one layer of winding is completed, and epoxy glue is evenly applied on the surface of the layer; Step 4: Without cutting the enameled wire 4, start to wind it back in two layers. After the second layer is wound, evenly apply epoxy glue, and then wind it back in the third layer, ... and repeat this process until the enameled wire is wound in n layers in total. Step 5: After winding the nth layer, i.e. the last circle, leave at least 10 cm of connector lead wire, cut the enameled wire 4, and then evenly apply the last layer of epoxy glue on the surface of the nth layer; Step 6: Test the resistance, inductance and insulation resistance at both ends of the enameled wire 4 and make sure they meet the requirements.

[0046] In the present invention, Figure 4 As shown, the enameled wire winding tool comprises a winding roller and a winding tool rotating part, and the winding roller is arranged as shown in FIG. Figure 2 Directly below the spraying part of the near-drill-bit and near-drill-azimuth gamma while-drilling measurement tool body 1 shown, the near-drill-bit and near-drill-azimuth gamma while-drilling measurement tool body 1 is connected to the rotating part of the winding tooling. During the winding operation, the enameled wire 4 is automatically wound by the rotation of the rotating part of the winding tooling.

[0047] In the present invention, after winding the enameled wire 4, an LCR meter is used to measure the resistance, inductance and insulation resistance at both ends of the enameled wire 4. The resistance at both ends of the enameled wire 4 is 25±2Ω, the inductance at both ends of the enameled wire 4 is 155±15mH, and the insulation resistance between the enameled wire 4 and the near-drill-bit near-drilling azimuth gamma while-drilling measurement tool body 1 is >500MΩ. The diameter of the enameled wire 4 is 0.56mm, and each layer is evenly coated with epoxy glue.

[0048] Preferably, in step seven, the steps of welding the antenna power line and the enameled wire 4 are as follows: Remove the insulation layer of the positive power line and the negative power line to the same height as the nth layer of enameled wire, and lay them flat to the outermost layer of the enameled wire 4; remove 10 mm of insulation layer from the two terminal leads of the enameled wire 4, weld the terminal lead of the first layer of enameled wire 4 to the negative power line by wrapping welding, and weld the terminal lead of the nth layer of enameled wire 4 to the positive power line by wrapping welding; place highland barley paper under the welding point for insulation protection, and use epoxy resin glue to coat the antenna power line and the enameled wire 4 and fix them on the surface of the nth layer of enameled wire 4.

[0049] In the present invention, the welding portion between the antenna power line and the enameled wire 4 is also insulated and protected by a heat shrink tube.

[0050] Preferably, in step eight, the steps of sealing the enameled wire 4 are as follows: In the first step, only the sealing ring 7 is installed in the sealing ring groove on the near-drilling azimuth gamma measurement while drilling tool body 1 without the retaining ring 6; The second step is to install the enameled wire sealing tooling and the sealing auxiliary system, with the enameled wire sealing tooling's glue inlet at the bottom and the air extraction port at the top; Step 3: Prepare epoxy glue and put it into a vacuum box for degassing for at least 30 minutes; The fourth step is to pour the prepared epoxy glue into the glue sealing tank, open the exhaust port valve of the enameled wire glue sealing tool, turn on the vacuum pump to pump to -0.1MPa, open the glue inlet valve of the enameled wire glue sealing tool for negative pressure glue sealing, and stop injecting glue when epoxy glue appears in the exhaust pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 5: Allow the glue to stand for at least 30 minutes to solidify, then place the antenna part together with the near-drilling azimuth gamma measurement while drilling tool body 1 into a high temperature box and allow it to stand for at least 6 hours at 75-85°C to solidify; Step 6: Take out the near-drilling azimuth gamma measurement while drilling tool body 1 from the high-temperature box, remove the sealing tool after natural cooling, and check whether the outer diameter size and Shore hardness of the sealing are qualified.

[0051] In the present invention, during the encapsulation of the enameled wire 4, only the sealing ring 7 is installed in the sealing ring groove on the near-bit azimuth gamma logging-while-drilling tool body 1, and the retaining ring 6 is not installed. Both the sealing ring 7 and the retaining ring 6 are components for sealing on the near-bit azimuth gamma logging-while-drilling tool body 1. The sealing ring 7 is made of rubber and is relatively soft, while the retaining ring 6 is made of PEEK and is relatively hard. When the sealing ring 7 is installed, it can seal the gap of the enameled wire encapsulation tooling during encapsulation, playing a sealing role. If the retaining ring 6 is also installed, it is not conducive to sealing and the disassembly of the enameled wire encapsulation tooling.

[0052] In the present invention, during the encapsulation of the enameled wire 4, the inlet of the enameled wire encapsulation tooling is at the bottom and the air extraction port is at the top. The inner wall of the enameled wire encapsulation tooling at the demolding part is evenly coated with silicone grease for easy demolding, and the possible overflow gaps are coated with sealant for plugging. The prepared epoxy adhesive is a two-component epoxy adhesive, and its total weight is configured according to requirements. The two-component epoxy adhesive includes a curing agent and a heat-resistant epoxy potting material, and the weight ratio of the curing agent to the heat-resistant epoxy potting material is 5:1. Only when the curing agent and the heat-resistant epoxy potting material are mixed can the performance indicators such as mechanical strength, insulation, and resistance to thermal shock after curing meet the practical requirements. The hardness of the encapsulation is measured with a portable Shore hardness tester, and a Shore hardness of 90 - 95 is qualified.

[0053] In the present invention, as Figure 5 shown, the enameled wire encapsulation tooling is a hollow cylindrical structure with an outer step. The side wall of the hollow cylinder is symmetrically provided with an inlet of the enameled wire encapsulation tooling and an air extraction port of the enameled wire encapsulation tooling. The air extraction port of the enameled wire encapsulation tooling is at the top, and the inlet of the enameled wire encapsulation tooling is at the bottom. The inlet of the enameled wire encapsulation tooling and the air extraction port of the enameled wire encapsulation tooling both adopt G3 / 8 threaded ports, and the inner hole roughness is 1.6 for cooperating with the sealing ring 7 to ensure sealing during glue injection.

[0054] As Figure 7 shown, in the present invention, the encapsulation auxiliary system includes an encapsulation tank, a vacuum pump, an air extraction pipeline, and a glue inlet pipeline. The vacuum pump is connected to the air extraction pipeline, and the other end of the air extraction pipeline is connected to the near-bit azimuth gamma logging-while-drilling tool body 1. The encapsulation tank is connected to the near-bit azimuth gamma logging-while-drilling tool body 1 through the glue inlet pipeline.

[0055] Preferably, in step ten, the specific steps for encapsulating the antenna cover 2 are as follows: The first step is to install the antenna cover encapsulation tooling and the encapsulation auxiliary system. The inlet of the antenna cover encapsulation tooling is at the bottom, and the air extraction port is at the top. The second step is to configure the epoxy adhesive and place it in a vacuum chamber for degassing for at least 30 minutes. Step 3: Pour the configured epoxy glue into the encapsulation tank, open the air extraction valve of the antenna cover encapsulation tooling, start the vacuum pump and pump to -0.1 MPa, then open the glue inlet valve of the antenna cover encapsulation tooling for negative pressure encapsulation. Stop injecting glue when epoxy glue appears in the air extraction pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 4: Let it stand for at least 30 minutes to solidify the glue, and then put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body 1 into a high-temperature oven and let it stand and cure for 6 hours at 75 - 85 °C; Step 5: Take out the near-bit azimuth gamma logging-while-drilling tool body 1 from the high-temperature oven, remove the antenna cover encapsulation tooling after natural cooling, and measure the hardness of the encapsulation with a portable Shore hardness tester. A Shore hardness of 90 - 95 is qualified; Step 6: Measure the resistance, inductance, and insulation resistance between the positive and negative power lines. The resistance between the positive and negative power lines is 25 ± 2 Ω, the inductance between the positive and negative power lines is 155 ± 15 mH, and the insulation resistance between the positive and negative power lines and the near-bit azimuth gamma logging-while-drilling tool body 1 is > 500 MΩ to be qualified.

[0056] In the present invention, during the encapsulation process of the antenna cover 2, the glue inlet of the antenna cover encapsulation tooling is at the bottom and the air extraction port is at the top; apply silicone grease evenly on the demoulding part of the inner wall of the antenna cover encapsulation tooling to facilitate demoulding, and apply sealant to seal the possible glue overflow gaps at each place. The configured epoxy glue is a two-component epoxy glue, and its total weight is configured according to requirements. The two-component epoxy glue includes a curing agent and a heat-resistant epoxy potting material, and the weight ratio of the curing agent to the heat-resistant epoxy potting material is 5:1. Only when the curing agent and the heat-resistant epoxy potting material are mixed, can the performance indicators such as mechanical strength, insulation, and resistance to thermal shock after curing meet the practical requirements. Use an LCR meter to measure the resistance, inductance, and insulation resistance between the positive and negative power lines. The resistance between the positive and negative power lines is 25 ± 2 Ω, the inductance between the positive and negative power lines is 155 ± 15 mH, and the insulation resistance between the positive and negative power lines and the near-bit azimuth gamma logging-while-drilling tool body 1 is > 500 MΩ to be qualified.

[0057] As Figure 6 shown, Figure 6 in (c) is the front view and (d) is the top view. The antenna cover encapsulation tooling is in the shape of a hollow cylinder, and this antenna cover encapsulation tooling is a two-in-one structure with central symmetry. During encapsulation, it is connected into one body by bolts through a designed rectangular flange. The side wall of the antenna cover encapsulation tooling is provided with a glue inlet of the antenna cover encapsulation tooling and an air extraction port of the antenna cover encapsulation tooling. Both the glue inlet of the antenna cover encapsulation tooling and the air extraction port of the antenna cover encapsulation tooling adopt G3 / 8 threaded ports, and the inner hole roughness is 1.6 to cooperate with the sealing ring 7 to ensure sealing during glue injection. At the same time, In the present invention, the specific steps of the pressure test are as follows: Install all the components used in the near-drilling azimuth gamma while-drilling measurement tool body 1 except the circuit part, and put the near-drilling azimuth gamma while-drilling measurement tool body 1 into a suitable pressure test device for pressure test. After the pressure is pressed to 120Mpa, keep the pressure for 30 minutes. After the pressure test is completed, check the sealing part. If there is no deformation, no cracks, and no water seepage, it is qualified. Use an LCR meter to measure the resistance, inductance and insulation resistance between the positive and negative power lines. The measured data is consistent with the resistance, inductance and insulation resistance measurement results between the positive and negative power lines during the sealing of the antenna cover 2 in step ten.

[0058] Embodiment 3: Based on the embodiment 1 or 2, in this embodiment, a method for sealing the antenna of a near-drill-bit azimuth gamma measurement while drilling tool is specifically applied as follows: the specific steps are: With 4.75 〃 The antenna sealing of the near-bit azimuth gamma measurement while drilling tool as a specific application implementation of the present invention includes the following steps: a. According to 4.75 〃 The dimensions of the sealing antenna of the near-drill bit azimuth gamma measurement while drilling tool are designed and processed; the sealing tooling includes magnetic ring sealing tooling, enameled wire sealing tooling and antenna cover sealing tooling.

[0059] b. Spray the zirconia insulation layer on the antenna winding slot. After spraying, use sandpaper to manually polish and adjust the coating thickness. The single-side thickness of the sprayed zirconia insulation layer is 0.2-0.3mm.

[0060] c. Install the antenna power line with a sealing plug in the antenna power line installation hole 8. After the installation is completed, perform an insulation resistance test between the power line and the near-drilling azimuth gamma while drilling measurement tool body 1. The test is qualified if it is greater than 500MΩ. The function of the antenna power line is to provide current for the antenna. There are two lines, one for the positive line and the other for the negative line, which constitute a complete power supply circuit for the antenna. The sealing plug seals and separates the antenna winding groove from the circuit part at the other end of the antenna power line installation hole 8 to prevent the drilling fluid from entering the interior of the near-drilling azimuth gamma while drilling measurement tool body 1 along the channel of the antenna power line installation hole 8 once the antenna sealant is damaged during underground operations.

[0061] d. Install the magnetic ring 5. The specific method of installing the magnetic ring 5 is as follows: evenly apply 502 glue on the zirconia coating, and evenly stick the magnetic ring 5 on the surface of the zirconia coating. When sticking, use a 0.5mm thick feeler gauge to adjust the gap between adjacent magnetic rings to 0.5mm.

[0062] e. Magnetic ring 5 is sealed with glue. The specific steps of sealing magnetic ring 5 are as follows: ① Use the magnetic ring sealing tool to surround the magnetic ring 5, apply silicone grease on the inner wall of the magnetic ring sealing tool to facilitate demoulding, fix the outside with tape, and use sealant to seal the gaps where glue overflows; ② Prepare 60 g of RHG2023 glue according to the weight ratio of curing agent to heat-resistant epoxy potting material of 5:1, put it into a vacuum box for degassing for 30 minutes, pour it from the glue inlet of the magnetic ring potting tooling. Stop injecting glue when a small amount of RHG203 glue overflows from the glue outlet, and let it stand for 30 minutes to solidify the glue; RHG2023 glue is a two-component epoxy resin potting material for high-temperature-resistant electronic components. RHG2023 glue has good resistance to high and low temperature shock and thermal stability, and can withstand the environment of -25°C to 180°C for a long time. RHG2023 glue has a flat and shiny appearance, and has high mechanical strength and electrical insulation performance.

[0063] ③ Put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body 1 into a high-temperature oven, and let it stand and cure for 6 hours at 75~85°C; Take out the near-bit azimuth gamma logging-while-drilling tool body 1 from the high-temperature oven, and remove the magnetic ring potting tooling after natural cooling.

[0064] f. Wind the enameled wire 4; The specific steps for winding the enameled wire 4 are as follows: ① After the magnetic ring 5 is potted, install the near-bit azimuth gamma logging-while-drilling tool body 1 (transmitting sub or receiving sub) on the enameled wire winding tooling; ② Install the enameled wire 4 on the winding roller of the enameled wire winding tooling, and lead out the wire from the lower end; ③ Make the led-out enameled wire 4 flush with the potted surface of the magnetic ring close to the antenna power supply hole 8. After leaving a 10 cm joint lead, start winding along the circumference of the potted surface of the magnetic ring 5. After manually winding a few turns, turn on the rotating part of the winding tooling and automatically wind at a speed of about 20 revolutions per minute. Pay attention to observing that the enameled wire 4 is arranged neatly and the coils are closely attached to each other. Wind until it is flush with the other potted surface of the magnetic ring 5, and one layer of winding is completed, and evenly apply RHG2023 glue; ④ Without cutting the enameled wire, start winding back for the second layer. After the second layer of winding is completed, evenly apply RHG2023 glue, and then wind back for the third layer,... Repeat in this way, and the enameled wire is wound for 8 layers in total; ⑤ After winding the last turn of the 8th layer, reserve a 10 cm joint lead, cut off the enameled wire, and then evenly apply the last layer of RHG2023 glue; ⑥ Use an LCR meter to measure the resistance, inductance and insulation resistance at both ends of the enameled wire. The resistance at both ends of the enameled wire is 25±2Ω, the inductance at both ends of the enameled wire is 155±15mH, and the insulation resistance between the enameled wire and the tool body >500MΩ is qualified. The wire diameter of the enameled wire is 0.56 mm, and RHG2023 glue is evenly applied to each layer.

[0065] g. Weld the power supply wire and the enameled wire 4; The steps for welding the power supply wire and the enameled wire 4 are as follows: ① Remove the insulation layer of the positive power line and the negative power line to the same height as the 8th layer of enameled wire, and lay it flat to the outermost layer of the enameled wire; ② Remove 10mm insulation layer of two enameled wires with paint stripper, weld the first layer of enameled wire 4 and the negative power wire together by wrapping welding, and weld the eighth layer of enameled wire 4 and the positive power wire together by wrapping welding; ③Pad barley paper under the soldering point for insulation protection, and use epoxy resin glue to coat the power cord and enameled wire 4 and fix them on the surface of the 8th layer of enameled wire. Heat shrink tubes are also used for insulation protection at the welding parts of the power cord and enameled wire 4.

[0066] h. Enameled wire 4 sealing glue; the steps of enameled wire 4 sealing glue are as follows: ① The sealing ring groove on the near-drilling azimuth gamma measurement while drilling tool body 1 is only equipped with the sealing ring 7 without the retaining ring 6; ②Install the enameled wire sealing tooling and sealing auxiliary system. The glue inlet of the enameled wire sealing tooling is at the bottom and the air extraction port is at the top. The demoulding part of the inner wall of the enameled wire sealing tooling is evenly coated with silicone grease for easy demoulding. Apply sealant to seal the gaps where glue may overflow; ③ According to the weight ratio of curing agent to heat-resistant epoxy potting material of 5:1, prepare 840 grams of RHG2023 glue and put it into a vacuum box for degassing for 30 minutes; ④ Pour the prepared RHG2023 glue into the glue sealing tank, open the air extraction valve, start the vacuum pump to pump to -0.1MPa, open the glue inlet valve for negative pressure sealing, and stop injecting glue when RHG2023 glue appears in the air extraction pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; the enameled wire sealing tooling is provided with a glue inlet and an air extraction port. The glue inlet and the air extraction port adopt G3 / 8 threaded ports, and the inner hole roughness of 1.6 is used to cooperate with the sealing ring to ensure the seal during glue injection.

[0067] ⑤Stand still for 30 minutes to solidify the glue, then put the antenna part together with the near-drilling azimuth gamma measurement while drilling tool body 1 into a high-temperature box and stand still for 6 hours to solidify at 75-85℃; ⑥ Take out the near-drilling azimuth gamma measurement while drilling tool body 1 from the high temperature box, remove the enameled wire sealant tooling after natural cooling, and measure the outer diameter and Shore hardness of the sealant to see if they are qualified. Use a portable Shore hardness tester to measure the hardness of the sealant, and the Shore hardness of 90-95 is qualified.

[0068] i. Install the antenna inner tube, sealing ring, retaining ring and antenna cover; j. Sealing the antenna cover 2 with glue. The specific steps of sealing the antenna cover 2 with glue are as follows: ①Install the antenna cover sealing tooling and sealing auxiliary system. The glue inlet of the antenna cover sealing tooling is at the bottom and the air extraction port is at the top. Apply silicone grease evenly on the demoulding part of the inner wall of the antenna cover sealing tooling to facilitate demoulding. Apply sealant to seal the gaps where glue may overflow; ② Prepare 240 g of RHG2023 glue according to the weight ratio of curing agent to heat-resistant epoxy potting material of 5:1, and place it in a vacuum chamber for degassing for 30 minutes; ③ Pour the prepared RHG2023 glue into the potting tank, open the air extraction port valve, turn on the vacuum pump and pump to -0.1 MPa, then open the glue inlet valve for negative pressure potting. When the RHG2023 glue appears in the air extraction pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline, stop injecting glue; The antenna outer potting tooling is provided with a glue inlet and an air extraction port. The glue inlet and air extraction port of the antenna outer potting tooling adopt G3 / 8 thread ports, and the inner hole roughness is 1.6 for mating with the sealing ring to ensure sealing during potting. At the same time, the antenna outer potting tooling is a two-in-one structure that is centrosymmetric, and is connected by bolts through the designed rectangular flange during potting.

[0069] ④ Let it stand for 30 minutes to solidify the glue, then put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body 1 (transmitting or receiving sub) into a high-temperature oven, and let it stand and cure at 75 - 85 °C for 6 hours; ⑤ Take out the near-bit azimuth gamma logging-while-drilling tool body 1 from the high-temperature oven, remove the antenna outer cover potting tooling after natural cooling, and measure the hardness of the potted glue with a portable Shore hardness tester. The Shore hardness of 90 - 95 is qualified; ⑥ Use an LCR meter to measure the resistance, inductance and insulation resistance between the positive and negative power lines. The resistance between the positive and negative power lines is 25 ± 2 Ω, the inductance between the positive and negative power lines is 155 ± 15 mH, and the insulation resistance between the positive and negative power lines and the tool body is > 500 MΩ, which is qualified.

[0070] k. Pressure test: Install all the components of the near-bit azimuth gamma logging-while-drilling tool body 1 except the circuit part, put the near-bit azimuth gamma logging-while-drilling tool body 1 into a suitable pressure testing device for pressure testing. After pressurizing to 120 Mpa, hold the pressure for 30 min. After the pressure test is completed, take out the near-bit azimuth gamma tool from the pressure testing device, and inspect the potted part, which has no deformation, no cracks and no water seepage. Use an LCR meter to measure the resistance, inductance and insulation resistance between the positive and negative power lines, and the measured data is the same as the measurement results in step j.

[0071] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0072] It should also be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0073] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any design identical or similar to the present invention falls within the scope of protection of the present invention. The device structures and method steps not described in detail in the present invention are prior art and will not be further described in the present invention.

Claims

1. A method for sealing the antenna of a near-bit azimuth gamma measurement-while-drilling tool, characterized in that: The specific steps are as follows: Step 1: Design and process a sealing tooling according to the size of the antenna to be sealed. Step 2: Spray a zirconia insulation layer at the antenna winding groove, and manually polish and trim the coating thickness with sandpaper after spraying. Step 3: Install the antenna power cable with a sealing plug in the antenna power cable installation hole (8). After installation, perform an insulation resistance test between the antenna power cable and the near-bit azimuth gamma measurement-while-drilling tool body (1). A value greater than 500 MΩ is qualified. Step 4: Install the magnetic ring (5). Step 5: Seal the magnetic ring (5). Step 6: Wind the enameled wire (4) around the magnetic ring (5). Step 7: Weld the enameled wire (4) to the antenna power cable. Step 8: Seal the enameled wire (4). Step 9: Install the corresponding antenna inner cylinder (3), sealing ring (7), retaining ring (6) and antenna outer cover (2) outside the enameled wire (4). Step 10: Seal the antenna outer cover (2). Step 11: After the sealing of the antenna outer cover (2) is completed, perform a pressure test.

2. A method for sealing the antenna of a near-bit azimuth gamma measurement-while-drilling tool according to claim 1, characterized in that: The sealing tooling includes a magnetic ring sealing tooling, an enameled wire sealing tooling and an antenna outer cover sealing tooling.

3. A method for sealing the antenna of a near-bit azimuth gamma measurement-while-drilling tool according to claim 1, characterized in that: In the step 4, the specific method for installing the magnetic ring (5) is as follows: evenly apply glue on the zirconia coating, evenly paste the magnetic ring (5) on the surface of the zirconia coating, and adjust the gap between adjacent magnetic rings (5) to 0.5 mm ± 0.05 mm by using a thickness gauge when pasting.

4. A method for sealing the antenna of a near-bit azimuth gamma measurement-while-drilling tool according to claim 1, characterized in that: In the step 5, the specific steps for sealing the magnetic ring (5) are as follows: First, surround the magnetic ring (5) with the magnetic ring sealing tooling. The inner wall of the magnetic ring sealing tooling is smeared with silicone grease and fixed with tape outside. Sealant is applied to seal all possible glue overflow gaps. Second, prepare epoxy glue and put it into a vacuum box for degassing for at least 30 minutes. Pour it in from the glue inlet of the magnetic ring sealing tooling. Stop injecting glue when a small amount of epoxy glue overflows from the glue outlet, and let it stand for at least 30 minutes to solidify the glue. Third, put the antenna part together with the near-bit azimuth gamma measurement-while-drilling tool body (1) into a high-temperature box and let it stand and cure at 75 - 85 °C for at least 6 hours. Then take out the near-bit azimuth gamma measurement-while-drilling tool body (1) from the high-temperature box and remove the sealing tooling after natural cooling.

5. A method for sealing the antenna of a near-bit azimuth gamma measurement-while-drilling tool according to claim 4, characterized in that: The magnetic ring sealing tooling is composed of a left half ring and a right half ring. When in use, the two half rings are combined into a hollow cylindrical shape. A glue inlet is provided on one side of the magnetic ring sealing tooling, and a glue outlet is provided on the other side. Wire grooves and oblique openings are designed on both sides of the inner hole. The oblique openings are fitted with both ends of the antenna groove of the antenna connector for positioning the magnetic ring sealing tooling. Pre-proportioned epoxy glue is injected through the right opening. The left side is an exhaust port. After the sealing is completed, wire grooves on both sides are generated to facilitate subsequent winding.

6. The method for sealing the antenna of a near-bit azimuth gamma measurement while drilling tool according to claim 1, Features: In step 6, the specific steps of winding the enameled wire (4) are as follows: In the first step, after the magnetic ring (5) is sealed with glue, the near-drill bit near-drilling azimuth gamma while-drilling measurement tool body (1) is installed on the winding tooling; The second step is to place the enameled wire (4) on the winding roller of the winding tool, and lead the wire out from the lower end; The third step is to make the enameled wire (4) flush with the end face of the sealing glue of the magnetic ring (5) near the antenna power line installation hole (8), leaving 8 cm -12 cm of the connector lead, and then start winding along the circumference of the surface of the sealing glue of the magnetic ring (5). After manually winding a few turns, turn on the rotating part of the winding tool and automatically wind at a speed of 15-25 revolutions per minute; until the winding is flush with the other end face of the sealing glue of the magnetic ring (5), one layer of winding is completed, and the surface of the layer of epoxy glue is evenly coated; Step 4: Without cutting the enameled wire (4), start winding it back in two layers. After the second layer is wound, apply epoxy glue evenly, then wind it back in a third layer, and so on. Repeat this process until the enameled wire is wound in n layers in total. Step 5: After winding the nth layer, which is the last circle, leave at least 10 cm of connector lead wire, cut the enameled wire (4), and then evenly apply the last layer of epoxy glue on the surface of the nth layer; Step 6: Test the resistance, inductance and insulation resistance of the enameled wire (4) at both ends and make sure they meet the requirements.

7. The method for sealing the antenna of a near-bit azimuth gamma measurement while drilling tool according to claim 1, Features: In step 7, the steps of welding the antenna power line and the enameled wire (4) are as follows: The insulation layers of the positive power line and the negative power line are removed to the same height as the nth layer of enameled wire, and are laid flat on the outermost layer of the enameled wire (4); 10 mm of insulation layer is removed from the two wiring leads of the enameled wire (4); the wiring leads of the first layer of enameled wire (4) are welded together with the negative power line by wrapping welding, and the wiring leads of the nth layer of enameled wire (4) are welded together with the positive power line by wrapping welding; barley paper is placed under the welding point for insulation protection, and the antenna power line and the enameled wire (4) are fixed to the surface of the nth layer of enameled wire (4) by coating with epoxy resin glue.

8. The method for sealing the antenna of a near-bit azimuth gamma measurement while drilling tool according to claim 1, Features: In step eight, the steps of sealing the enameled wire (4) with glue are as follows: In the first step, only the sealing ring (7) is installed in the sealing ring groove on the near-drilling azimuth gamma measurement while drilling tool body (1), without the retaining ring (6); The second step is to install the enameled wire sealing tooling and the sealing auxiliary system, with the enameled wire sealing tooling's glue inlet at the bottom and the air extraction port at the top; Step 3: Prepare the epoxy adhesive and place it in a vacuum chamber for degassing for at least 30 minutes; Step 4: Pour the prepared epoxy adhesive into the encapsulation tank, open the air extraction valve of the enameled wire encapsulation tooling, turn on the vacuum pump to pump to -0.1 MPa, open the glue inlet valve of the enameled wire encapsulation tooling for negative pressure encapsulation, and stop injecting glue when epoxy adhesive appears in the air extraction pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 5: Let it stand for at least 30 minutes for solidification, and then put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body (1) into a high-temperature chamber and let it stand for curing at 75 - 85 °C for at least 6 hours; Step 6: Take out the near-bit azimuth gamma logging-while-drilling tool body (1) from the high-temperature chamber, remove the encapsulation tooling after natural cooling, and check whether the outer diameter size and Shore hardness of the encapsulation are qualified.

9. A method for encapsulating the antenna of a near-bit azimuth gamma logging-while-drilling tool according to claim 1, characterized in that: In step 10 described above, the specific steps for encapsulating the antenna cover (2) are as follows: Step 1: Install the antenna cover encapsulation tooling and the encapsulation auxiliary system. The glue inlet of the antenna cover encapsulation tooling is at the bottom and the air extraction port is at the top; Step 2: Prepare the epoxy adhesive and place it in a vacuum chamber for degassing for at least 30 minutes; Step 3: Pour the prepared epoxy adhesive into the encapsulation tank, open the air extraction valve of the antenna cover encapsulation tooling, turn on the vacuum pump to pump to -0.1 MPa, open the glue inlet valve of the antenna cover encapsulation tooling for negative pressure encapsulation, and stop injecting glue when epoxy adhesive appears in the air extraction pipeline and its liquid level is basically flush with the liquid level in the glue inlet pipeline; Step 4: Let it stand for at least 30 minutes for solidification, and then put the antenna part together with the near-bit azimuth gamma logging-while-drilling tool body (1) into a high-temperature chamber and let it stand for curing at 75 - 85 °C for 6 hours; Step 5: Take out the near-bit azimuth gamma logging-while-drilling tool body (1) from the high-temperature chamber, remove the antenna cover encapsulation tooling after natural cooling, and measure the encapsulation hardness with a portable Shore hardness tester. The Shore hardness of 90 - 95 is qualified; Step 6: Measure the resistance, inductance and insulation resistance between the positive and negative power supply lines. The resistance between the positive and negative power supply lines is 25 ± 2 Ω, the inductance between the positive and negative power supply lines is 155 ± 15 mH, and the insulation resistance between the positive and negative power supply lines and the near-bit azimuth gamma logging-while-drilling tool body (1) is > 500 MΩ to be qualified.

10. A method for encapsulating the antenna of a near-bit azimuth gamma logging-while-drilling tool according to claim 1, characterized in that: In step 2 described above, the unilateral thickness of the sprayed zirconia insulation layer is 0.2 mm - 0.3 mm.

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