Transmitting antenna equipment for lateral resistivity imaging logging instrument while drilling

Abstract

The invention provides a transmitting antenna device for a while-drilling lateral resistivity imaging logging instrument. A transmitting antenna device for a while-drilling lateral resistivity imaging logging instrument, comprising: an instrument drill collar structure having a mounting groove; the magnetic core assembly is in an annular shape, the instrument drill collar structure is sleeved with the magnetic core assembly, and the magnetic core assembly is located in the installation groove; and the protection structure is annular, the instrument drill collar structure is sleeved with the protection structure, the protection structure wraps the outer side of the magnetic core assembly, and the installation groove is filled with the protection structure. According to the invention, the problems of short service life and high construction engineering risk of transmitting antenna equipment in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling equipment, in particular to a transmitting antenna device for a lateral resistivity imaging logging tool while drilling. Background Art

[0002] In the process of oil exploration and development, resistivity and wellbore electrical imaging are very important formation evaluation parameters. The demand for logging while drilling technology is becoming increasingly urgent. The use of logging while drilling technology can achieve drilling geological guidance, improve the drilling rate, and optimize the drilling trajectory; for the collection of logging data for risky wells, the use of logging while drilling technology can effectively reduce engineering risks. Even if the engineering parameters of the drilling instrument are close to the drill collar parameters after encountering engineering risks, the drilling team can handle the dangerous situation according to the drilling engineering risk disposal process.

[0003] Electrical imaging is increasingly used in the development of complex oil and gas reservoirs such as faults, fractures, thin layers, low porosity, and low permeability. Conventional cable logging technology can no longer meet production needs. As the depth of exploration and development becomes deeper, the well conditions become more complex, and the construction risks become higher, the difficulty of collecting electrical imaging data in ultra-deep and complex wells is increasing; resistivity scanning imaging technology while drilling is the earliest, most mature, and most widely used technology developed abroad. It has become an effective means to solve the problems of real-time geological guidance and formation evaluation of complex reservoirs, and can be used for detailed interpretation and evaluation of complex reservoirs such as faults, fractures, holes, and thin layers.

[0004] Resistivity while drilling is one of the effective judgment bases for geosteering decision-making. With the development of more and more horizontal wells, improving the drilling rate has become the primary task of drilling construction. The lateral resistivity imaging logging tool while drilling can detect azimuthal resistivity and provide first-hand data support for trajectory adjustment for geosteering.

[0005] The design and development of the LWD lateral resistivity imaging logging instrument has made the transmitting antenna the primary challenge. Both LWD resistivity measurement and high-definition borehole electrical imaging cannot be separated from the driving source generated by the transmitting antenna. The difficulty lies in first meeting the instrument functional requirements, secondly meeting the engineering application index requirements of the LWD instrument, and also having strong adaptability to long-term harsh environments such as temperature resistance, pressure resistance, wear resistance, and corrosion resistance.

[0006] The traditional lateral logging instrument launch system uses metal electrodes to directly launch current into the formation. Non-metallic materials are required to be used to insulate the electrodes, and the insulators are relatively long. For the while-drilling instrument, it takes a long time to enter the well. During drilling, the instrument rubs violently against the well wall or cuttings. If the launch electrode structure of the cable logging is used, the insulation part of the instrument needs to be longer. First, non-metallic materials are easily worn. Second, non-metallic materials will cause the mechanical strength of the while-drilling instrument to decrease, especially the performance of field engineering applications such as torsion resistance, tension resistance, and compression resistance will be greatly reduced. Based on these two points, the launch electrode structure of the cable logging lateral instrument cannot be applied to the launch system of the while-drilling lateral logging instrument. The launch antenna structure of the early designed while-drilling lateral resistivity imaging logging instrument was too large. The four launch antennas caused a sharp change in diameter on the instrument, resulting in strong rigidity of the instrument and a high risk of stuck drill.

[0007] That is to say, the transmitting antenna equipment in the prior art has the problems of short service life and high construction engineering risk. Summary of the invention

[0008] The main purpose of the present invention is to provide a transmitting antenna device for a lateral resistivity imaging logging tool while drilling, so as to solve the problems of short service life and high construction engineering risk of the transmitting antenna device in the prior art.

[0009] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a transmitting antenna device for a while-drilling lateral resistivity imaging logging instrument is provided, comprising: an instrument drill collar structure, the instrument drill collar structure having an installation groove; a magnetic core assembly, the magnetic core assembly being annular, the magnetic core assembly being sleeved on the instrument drill collar structure, and the magnetic core assembly being located in the installation groove; a protective structure, the protective structure being annular, the protective structure being sleeved on the instrument drill collar structure, and the protective structure being covered on the outside of the magnetic core assembly, and the protective structure filling the installation groove.

[0010] Furthermore, the magnetic core assembly includes: a magnetic core support, which is annular; a magnetic core, which is arranged end to end on the outer ring surface of the magnetic core support; and a coil, which is evenly wound on the magnetic core along the axial direction of the magnetic core.

[0011] Furthermore, an annular assembly groove is provided on the outer peripheral side of the magnetic core support, and the magnetic core is arranged end to end in the annular assembly groove.

[0012] Furthermore, the magnetic core bracket includes: a first annular bracket, the magnetic core is arranged on the first annular bracket, and the coil is wound on the first annular bracket and the magnetic core; a second annular bracket, the second annular bracket is arranged on the inner side of the first annular bracket, and the second annular bracket has a plurality of grooves on the side surface facing the first annular bracket, the grooves extend along the axial direction of the second annular bracket, and at least a portion of the coil is accommodated in the grooves.

[0013] Furthermore, the cross section of the mounting groove in the axial direction is arc-shaped.

[0014] Furthermore, the protective structure includes: fiberglass, which is filled in the installation groove; a first protective component, which is sleeved on the instrument drill collar structure and located on the outer peripheral side of the magnetic core assembly; a second protective component, which is sleeved on the instrument drill collar structure and located on one side of the first protective component; an insulating member, which is located between the first protective member and the second protective member, and both the first protective member and the second protective member are connected to the insulating member.

[0015] Furthermore, the first protective component includes: an insulating layer, which is arranged on the fiberglass and corresponds to the installation groove; a protective shell, which is sleeved on the outside of the insulating layer and corresponds to the installation groove; a half-split key, which is located at one end of the protective shell away from the insulating part, and the half-split key is threadedly connected to the protective shell.

[0016] Furthermore, one end of the protective shell away from the insulating member has an internal thread section, and the half key has an external thread section.

[0017] Furthermore, the instrument drill collar structure also includes a limiting groove, which is located on one side of the installation groove. The limiting groove is filled with fiberglass, and the insulating piece is sleeved on the outer peripheral side of the limiting groove.

[0018] Furthermore, the second protection component is a fixing ring, which includes a crimping section and a fixing section connected in sequence, the thickness of the crimping section is smaller than the thickness of the fixing section, and the crimping section is crimped onto the insulating member.

[0019] Furthermore, the instrument drill collar structure also includes a fixing groove, and the fixing section is accommodated in the fixing groove.

[0020] Furthermore, the insulating part is an insulating ring, which includes a first connecting section, an isolation section and a second connecting section connected in sequence along the axial direction, the first protective component is crimped on the first connecting section, and the second protective component is crimped on the second connecting section. The thickness of the first connecting section and the second connecting section is smaller than that of the isolation section to form a step difference at the connection between the isolation section and the first connecting section and the second connecting section.

[0021] Furthermore, the first connecting section has a receiving groove, and at least a portion of the first protection component extends into the receiving groove.

[0022] By applying the technical solution of the present invention, a transmitting antenna device for a while-drilling lateral resistivity imaging logging instrument comprises an instrument drill collar structure, a magnetic core assembly and a protective structure, wherein the instrument drill collar structure has an installation groove; the magnetic core assembly is annular, the magnetic core assembly is sleeved on the instrument drill collar structure, and the magnetic core assembly is located in the installation groove; the protective structure is annular, the protective structure is sleeved on the instrument drill collar structure, and the protective structure is covered on the outside of the magnetic core assembly, and the protective structure is filled in the installation groove.

[0023] An installation groove is set on the instrument drill collar structure, which can realize the inward sinking of the magnetic core assembly, reduce the outer diameter of the transmitting antenna equipment, and reduce the risk of drill sticking. Secondly, it provides installation space for the protective structure, so that the magnetic core assembly can withstand a pressure of 140MPa, effectively reducing the damage to the magnetic core assembly caused by downhole impact and effectively improving the service life of the transmitting antenna equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A schematic structural diagram of a transmitting antenna device according to an optional embodiment of the present invention is shown;

[0026] Figure 2 Shows Figure 1 A schematic diagram of the structure of a transmitting antenna device without azimuth electrodes and button electrodes;

[0027] Figure 3 Shows Figure 2 Middle AA view;

[0028] Figure 4 Shows Figure 3 The enlarged view of P in the middle;

[0029] Figure 5 Shows Figure 3 Structural schematic diagram of the middle magnetic core assembly;

[0030] Figure 6 Shows Figure 5 Schematic diagram of the structure of the middle magnetic core bracket;

[0031] Figure 7 Shows Figure 3 A schematic diagram of the structure of the second protection component;

[0032] Figure 8 Shows Figure 3 A schematic diagram of the structure of the middle insulating member;

[0033] Fig. 9 Shows Figure 3 A schematic diagram of the structure of the first protection component;

[0034] Fig.10 Shows Figure 2 Schematic diagram of the structure of the instrument drill collar.

[0035] The above drawings include the following reference numerals:

[0036] 10. Instrument drill collar structure; 11. Installation groove; 12. Limiting groove; 13. Fixing groove; 14. Assembly groove; 20. Magnetic core assembly; 21. Magnetic core bracket; 211. Annular assembly groove; 212. First annular bracket; 213. Second annular bracket; 214. Notch; 22. Magnetic core; 23. Coil; 30. Protection structure; 31. Glass fiber reinforced plastic; 32. First protection component; 321. Insulating layer; 322. Protective shell; 323. Half key; 33. Second protection component; 331. Crimping section; 332. Fixing section; 34. Insulating member; 341. First connecting section; 342. Isolating section; 343. Second connecting section; 344. Accommodating groove; 35. Fixing hole; 40. Azimuth electrode; 50. Button electrode. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0039] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0040] In order to solve the problems of short service life and high construction engineering risk of transmitting antenna equipment in the prior art, the main purpose of the present invention is to provide a transmitting antenna equipment for a lateral resistivity imaging logging tool while drilling.

[0041] like Figures 1 to 10 As shown, the transmitting antenna device for the while-drilling lateral resistivity imaging logging instrument includes an instrument drill collar structure 10, a magnetic core assembly 20 and a protective structure 30. The instrument drill collar structure 10 has an installation groove 11; the magnetic core assembly 20 is annular, the magnetic core assembly 20 is sleeved on the instrument drill collar structure 10, and the magnetic core assembly 20 is located in the installation groove 11; the protective structure 30 is annular, the protective structure 30 is sleeved on the instrument drill collar structure 10, and the protective structure 30 is covered on the outside of the magnetic core assembly 20, and the protective structure 30 is filled in the installation groove 11.

[0042] An installation groove 11 is provided on the instrument drill collar structure 10, which can realize the inward sinking of the magnetic core assembly 20, reduce the outer diameter of the transmitting antenna equipment, and reduce the risk of drill sticking. Secondly, it provides an installation space for the protective structure 30, so that the magnetic core assembly 20 can withstand a pressure of 140MPa, effectively reducing the damage to the magnetic core assembly 20 caused by downhole impact, and effectively improving the service life of the transmitting antenna equipment.

[0043] like Figures 4 to 6 As shown, the magnetic core assembly 20 includes a magnetic core support 21, a magnetic core 22 and a coil 23. The magnetic core support 21 is annular; the magnetic core 22 is arranged end to end on the outer ring surface of the magnetic core support 21; and the coil 23 is evenly wound on the magnetic core 22 along the axial direction of the magnetic core 22. The magnetic core material is an iron-based amorphous alloy material that can withstand high temperatures of 210°C. The coil 23 is evenly wound on the annular magnetic core 22 according to the designed number of turns, and together with the non-metallic magnetic core support 21, the magnetic core assembly 20 is formed. The instrument drill collar structure 10 passes through the magnetic core assembly 20 as a part of the secondary coil.

[0044] Specifically, the outer peripheral side of the magnetic core support 21 has an annular assembly groove 211, and the magnetic core 22 is arranged end to end in the annular assembly groove 211. This arrangement is conducive to limiting the magnetic core 22, so that the magnetic core 22 and the magnetic core support 21 are stably connected. At the same time, the coil 23 is wound around the outer side of the annular assembly groove 211 to limit the magnetic core 22, reduce the risk of the magnetic core 22 falling off, and improve the service life of the magnetic core assembly 20.

[0045] like Figure 5 and Figure 6 As shown, the magnetic core support 21 includes a first annular support 212 and a second annular support 213. The magnetic core 22 is arranged on the first annular support 212, and the coil 23 is wound on the first annular support 212 and the magnetic core 22; the second annular support 213 is arranged on the inner side of the first annular support 212, and the second annular support 213 has a plurality of grooves 214 on one side of the surface facing the first annular support 212. The grooves 214 extend along the axial direction of the second annular support 213, and at least a part of the coil 23 is accommodated in the grooves 214. The first annular support 212 is used to support the magnetic core 22, and the second annular support 213 provides an accommodating space for the coil 23, so that when the first annular support 212 and the second annular support 213 are sleeved together, the coil 23 is hidden in the grooves 214.

[0046] like Figure 3 , Figure 4 and Fig.10 As shown, the cross section of the installation groove 11 in the axial direction is an arc shape. This arrangement places the magnetic core assembly 20 at the lowest position of the installation groove 11, which is conducive to the protection structure 30 to protect the magnetic core assembly 20.

[0047] like Figure 3 and Figure 4 As shown, the protective structure 30 includes FRP 31, a first protective component 32, a second protective component 33 and an insulating member 34. The FRP 31 is filled in the installation groove 11; the first protective component 32 is sleeved on the instrument drill collar structure 10 and is located on the outer peripheral side of the magnetic core assembly 20; the second protective component 33 is sleeved on the instrument drill collar structure 10, and the second protective component 33 is located on one side of the first protective component 32; the insulating member 34 is located between the first protective component 32 and the second protective component 33, and the first protective component 32 and the second protective component 33 are both connected to the insulating member 34. The FRP 31 can increase the pressure that the magnetic core assembly 20 can withstand, and the first protective component 32 can prevent the packaging structure of the FRP 31 from being broken due to impact and wear downhole, and avoid the situation where the magnetic core assembly 20 is damaged due to the rupture of the FRP 31. The insulating member 34 is sleeved on the instrument drill collar structure 10. The function of the insulating member 34 is to disconnect the secondary. Together with the groove filled with the glass fiber reinforced plastic 31 on the instrument drill collar structure 10, it constitutes a necessary condition for the emission drive current to be output to the annulus. The material used is a ceramic-doped PEEK material with good wear resistance and high temperature resistance. The second protection component 33 is used to fix the insulating member 34 and, as part of the secondary coil, provides an output pole for the drive current output.

[0048] After the transmitting antenna equipment of the while-drilling lateral resistivity imaging logging instrument is put into the well, the instrument drill collar structure 10 passes through the annular magnetic core assembly 20 as a part of the secondary single-turn coil, and the insulating member 34 disconnects the metal loop of the first protection component 32 and the second protection component 33. The first protection component 32 is connected to the upper end of the instrument drill collar structure 10 as the upper output pole of the secondary coil, and the second protection component 33 is connected to the lower end of the instrument drill collar structure 10 as the lower output pole of the secondary coil, forming a single-turn secondary loop together with the drilling annulus and the formation.

[0049] like Figure 4 and Figure 5 As shown, the first protection component 32 includes an insulating layer 321, a protective shell 322 and a half-split key 323. The insulating layer 321 is arranged on the glass fiber reinforced plastic 31 and corresponds to the installation groove 11; the protective shell 322 is sleeved on the outer side of the insulating layer 321 and the protective shell 322 corresponds to the installation groove 11; the half-split key 323 is located at one end of the protective shell 322 away from the insulating member 34, and the half-split key 323 is threadedly connected to the protective shell 322. The protective shell 322 is used to protect the magnetic core assembly 20. The half-split key 323 is a detachable two-half threaded fixing device. The protective shell 322 is located on the outer side of the half-split key 323 and is used to fix the protective shell 322. The insulating layer 321 is used to isolate the protective shell 322 from the magnetic core assembly 20, ensuring that the magnetic core assembly 20 and the protective shell 322 form a mutual inductance, so that the protective shell 322 is connected to the upper end of the instrument drill collar structure 10 as the upper output pole of the secondary coil.

[0050] The protective shell 322 is also provided with an assembly groove 14 , and the half key 323 is assembled in the assembly groove 14 .

[0051] exist Fig.10 In the specific embodiment shown, the outer peripheral surface of the instrument drill collar structure 10 also has a threaded structure, which is located at both ends of the mounting groove 11 in the axial direction, and the fiberglass reinforced plastic 31 is threadedly connected to the instrument drill collar structure 10 .

[0052] It should be noted that FRP 31 can withstand high temperatures of 175°C and high pressures of 140MPa.

[0053] Specifically, the end of the protective shell 322 away from the insulating member 34 has an internal thread section, and the half key 323 has an external thread section. This arrangement allows the protective shell 322 and the half key 323 to be threadedly connected, thereby improving the tightness of the connection between the protective shell 322 and the half key 323. A portion of the half key 323 is embedded in the instrument drill collar structure 10, and the outer surface of the half key 323 is threaded, and the two half keys 323 have a portion of a full circle of threads. The protective shell 322 has a full circle of threads, and the two half keys 323 are symmetrically distributed. The protective shell can be fastened to the instrument drill collar structure 10 by a machine according to the designed torque.

[0054] like Fig.10 As shown, the instrument drill collar structure 10 further includes a limiting groove 12, the limiting groove 12 is located on one side of the installation groove 11, the limiting groove 12 is filled with glass fiber reinforced plastic 31, and the insulating member 34 is sleeved on the outer peripheral side of the limiting groove 12. Filling the limiting groove 12 with glass fiber reinforced plastic 31 can improve the sealing effect, and the insulating member 34 sleeved on the outer peripheral side of the limiting groove 12 improves the tightness of the connection between the insulating member 34 and the instrument drill collar structure 10.

[0055] like Figure 7 As shown, the second protection component 33 is a fixed ring, which includes a crimping section 331 and a fixed section 332 connected in sequence, the thickness of the crimping section 331 is less than the thickness of the fixed section 332, and the crimping section 331 is crimped on the insulating member 34. The outer circumferences of the crimping section 331 and the fixed section 332 are flush, and the thickness of the crimping section 331 is less than the thickness of the fixed section 332 to form a step difference at the connection between the crimping section 331 and the fixed section 332, so that the insulating member 34 is spaced from the outer circumference of the instrument drill collar structure 10 and the insulating member 34 is pressed.

[0056] exist Figure 7 In the specific embodiment shown, the fixing ring is formed by two half rings, and the half rings are provided with fixing holes 35, and bolts are transmitted in the fixing holes 35 to connect the two half rings together.

[0057] On the one hand, the fixing ring is used to fix the insulating part 34 to prevent the insulating part 34 from slipping up and down. On the other hand, the fixing ring is also made of the same metal as the instrument drill collar structure 10. The fixing ring and the instrument drill collar structure 10 are also connected by metal. The junction between the insulating part 34 and the fixing ring is the lower output pole of the transmitting system. The secondary single-turn coil is cut off by the insulating ring and the fiberglass 31 in the limiting groove 12, and the secondary circuit is extended in the well. The current must pass through the mud and the formation to return to the other level.

[0058] like Fig.10 As shown, the instrument drill collar structure 10 further includes a fixing groove 13, and the fixing section 332 is accommodated in the fixing groove 13. The setting of the fixing groove 13 can limit the fixing section 332 to ensure that the fixing ring is stably connected to the instrument drill collar structure 10.

[0059] like Figure 5 and Figure 8 As shown, the insulating member 34 is an insulating ring, which includes a first connecting segment 341, an isolating segment 342, and a second connecting segment 343 connected in sequence along the axial direction. The first protection component 32 is crimped on the first connecting segment 341, and the second protection component 33 is crimped on the second connecting segment 343. The thickness of the first connecting segment 341 and the second connecting segment 343 is smaller than that of the isolating segment 342, so as to form a step difference at the connection between the isolating segment 342 and the first connecting segment 341 and the second connecting segment 343. The first protection component 32 and the second protection component 33 are connected to the first connecting segment 341 and the second connecting segment 343 respectively, and the insulation of the first protection component 32 and the second protection component 33 is achieved under the blocking effect of the isolating segment 342. The insulating ring is a ceramic-doped PEEK insulating material with strong wear resistance, high temperature resistance and corrosion resistance. The portion filled with the fiberglass 31 in the limiting groove 12 will not be eroded by the downhole mud. On the other hand, together with the fiberglass 31 in the limiting groove 12, it cuts off the secondary circuit, providing a window for the transmitting antenna equipment to transmit current to the annulus and the formation.

[0060] like Figure 5 and Figure 8 As shown, the first connecting section 341 has a receiving groove 344, and at least a portion of the first protection component 32 extends into the receiving groove 344. The receiving groove 344 is located at one end of the first connecting section 341 close to the isolation section 342. By providing the receiving groove 344 on the first connecting section 341, the first protection component 32 can be limited to reduce the risk of separation between the first protection component 32 and the insulating member 34, thereby improving the working stability of the first protection component 32.

[0061] like Figure 1As shown, the transmitting antenna device for the lateral resistivity imaging logging tool while drilling also includes an azimuth electrode 40 and a button electrode 50 . The azimuth electrode 40 and the button electrode 50 are arranged on the instrument drill collar structure 10 and are spaced apart from the magnetic core assembly 20 in the axial direction.

[0062] The spirally wound annular transmitting antenna T (transmitting antenna) is passed through an alternating current of a constant frequency, generating a constant voltage VT on the instrument drill collar structure 10 on both sides of the transmitting antenna, forming an eddy current IT centered on T on the instrument drill collar structure 10, and flowing into the wellbore and formation from one side of the instrument drill collar structure 10, and returning to the other side of the instrument drill collar structure 10. The quadrant plate monitors the potential difference generated by the azimuth electrode 40 to monitor the azimuth, and the button plate monitors the potential difference generated by the button electrode 50. After the adjustment is completed, equipotential fields are formed on both the quadrant plate and the button plate, and the lateral resistivity curve data and resistivity imaging data can be obtained by sampling and adjusting the current.

[0063] The transmitting antenna device used for the lateral resistivity imaging logging instrument while drilling in this application has the same working principle as the antenna structure of the early design used on the scientific research prototype. Both use the electromagnetic induction principle of the transformer, but the implementation method is different. The transmitting antenna device in this application is more suitable for the high temperature and high pressure environment underground, and can effectively reduce the construction risks of the early design.

[0064] The product in this application can provide driving signals for the lateral logging instrument while drilling, and can be effectively applied to the on-site construction environment, such as high temperature resistance, high pressure resistance, corrosion resistance, etc.; it can also meet the engineering parameters of the construction while drilling, such as tensile resistance, compression resistance, torsion resistance, etc. This innovative achievement has been successfully applied to the independently developed 4.75-inch lateral resistivity imaging instrument while drilling, solving the design and production problems of the transmitting antenna of the 4.75-inch lateral logging instrument while drilling, and meeting the requirements of the on-site construction engineering indicators. For the 4.75-inch instrument, its indicators can reach 111 tons of tension, 23 tons of pressure, and 18 kilonewton meters of torque.

[0065] The magnetic core 22 is a strip magnetic core material of an iron-based amorphous alloy. According to the requirements of the inductance and quality factor of the instrument, it is wound according to the designed thickness and sintered on the instrument drill collar structure 10. Then, a spiral coil 23 is formed on the magnetic core according to the designed number of turns to form the primary coil of the transformer. Finally, it is encapsulated on the instrument drill collar structure 10 using a glass fiber reinforced plastic 31 vacuum impregnation layered treatment process so that it can withstand the high temperature and high pressure environment underground after entering the well.

[0066] The structure of this application can effectively solve the technical problems of designing and manufacturing transmitting antennas for lateral drilling instruments, and provide the necessary basic conditions for instrument design and development. With the increasing development of high-temperature deep carbonate reservoirs and shale gas in China, the demand for lateral drilling instruments will increase. The market demand for this achievement is huge and has broad application prospects.

[0067] At present, the transmitting antennas of lateral drilling instruments in China are mainly distributed in the antenna principle design, and the physical structure design of engineering applications is still lacking. This application can effectively fill the gap in the field of engineering application of transmitting antennas based on the electromagnetic induction principle of transformers in China.

[0068] At present, this application has reference significance for the design and production of transmitting antennas for lateral logging while drilling instruments. It can replace imports, improve the market competitiveness of logging while drilling equipment, and effectively reduce the cost of introducing imported instruments.

[0069] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A transmitting antenna device for a lateral resistivity imaging logging tool while drilling, characterized in that: include: An instrument drill collar structure (10), wherein the instrument drill collar structure (10) has a mounting groove (11); A magnetic core assembly (20), the magnetic core assembly (20) being ring-shaped, the magnetic core assembly (20) being sleeved on the instrument drill collar structure (10), and the magnetic core assembly (20) being located in the mounting groove (11); A protective structure (30) is annular, the protective structure (30) is sleeved on the instrument drill collar structure (10), and the protective structure (30) is coated on the outer side of the magnetic core assembly (20), and the protective structure (30) is filled in the installation groove (11).

2. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 1, characterized in that: The magnetic core assembly (20) comprises: A magnetic core support (21), wherein the magnetic core support (21) is ring-shaped; A magnetic core (22), the magnetic core (22) being arranged end to end on the outer annular surface of the magnetic core support (21); A coil (23), wherein the coil (23) is evenly wound on the magnetic core (22) along the axial direction of the magnetic core (22).

3. The transmitting antenna device for the lateral resistivity imaging logging tool while drilling according to claim 2, characterized in that: The outer peripheral side of the magnetic core support (21) is provided with an annular assembly groove (211), and the magnetic core (22) is arranged end to end in the annular assembly groove (211).

4. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 2, characterized in that: The magnetic core support (21) comprises: A first annular support (212), the magnetic core (22) being arranged on the first annular support (212), and the coil (23) being wound around the first annular support (212) and the magnetic core (22); A second annular bracket (213), wherein the second annular bracket (213) is arranged on the inner side of the first annular bracket (212), and a surface of the second annular bracket (213) facing the first annular bracket (212) has a plurality of grooves (214), wherein the grooves (214) extend along the axial direction of the second annular bracket (213), and at least a portion of the coil (23) is accommodated in the grooves (214).

5. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to any one of claims 1 to 4, characterized in that: The cross section of the installation groove (11) in the axial direction is arc-shaped.

6. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to any one of claims 1 to 4, characterized in that: The protective structure (30) comprises: Glass fiber reinforced plastic (31), the glass fiber reinforced plastic (31) is filled in the installation groove (11); A first protection component (32), the first protection component (32) being sleeved on the instrument drill collar structure (10) and located on the outer peripheral side of the magnetic core assembly (20); A second protection component (33), the second protection component (33) is sleeved on the instrument drill collar structure (10), and the second protection component (33) is located on one side of the first protection component (32); An insulating member (34), wherein the insulating member (34) is located between the first protection component (32) and the second protection component (33), and the first protection component (32) and the second protection component (33) are both connected to the insulating member (34).

7. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 6, characterized in that: The first protection component (32) comprises: An insulating layer (321), the insulating layer (321) being disposed on the glass fiber reinforced plastic (31) and corresponding to the mounting groove (11); A protective shell (322), the protective shell (322) being sleeved on the outside of the insulating layer (321) and the protective shell (322) corresponding to the installation groove (11); A half key (323), wherein the half key (323) is located at one end of the protective shell (322) away from the insulating member (34), and the half key (323) is threadedly connected to the protective shell (322).

8. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 7, characterized in that: One end of the protective shell (322) away from the insulating member (34) has an internal thread section, and the half key (323) has an external thread section.

9. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 6, characterized in that: The instrument drill collar structure (10) further comprises a limiting groove (12), wherein the limiting groove (12) is located on one side of the mounting groove (11), the limiting groove (12) is filled with the glass fiber reinforced plastic (31), and the insulating member (34) is sleeved on the outer peripheral side of the limiting groove (12).

10. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 6, characterized in that: The second protection component (33) is a fixing ring, comprising a crimping section (331) and a fixing section (332) connected in sequence, the thickness of the crimping section (331) being smaller than the thickness of the fixing section (332), and the crimping section (331) being crimped onto the insulating member (34).

11. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 10, characterized in that: The instrument drill collar structure (10) further comprises a fixing groove (13), and the fixing section (332) is accommodated in the fixing groove (13).

12. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 6, characterized in that: The insulating member (34) is an insulating ring, comprising a first connecting section (341), an isolating section (342) and a second connecting section (343) which are sequentially connected along the axial direction; the first protective component (32) is crimped onto the first connecting section (341), and the second protective component (33) is crimped onto the second connecting section (343); the thickness of the first connecting section (341) and the second connecting section (343) is smaller than that of the isolating section (342), so as to form a step difference at the connection between the isolating section (342) and the first connecting section (341) and the second connecting section (343).

13. The transmitting antenna device for a lateral resistivity imaging logging tool while drilling according to claim 12, characterized in that: The first connecting section (341) has a receiving groove (344), and at least a portion of the first protection component (32) extends into the receiving groove (344).

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