Casing directional logging-while-drilling drilling tool

Abstract

The utility model discloses a casing directional logging-while-drilling drilling tool which comprises a casing and a locking device connected with the casing, and the bottom end of the locking device is sequentially connected with a centralizer, a reamer while drilling, a measuring device along with a well and a drill bit part. The reamer while drilling comprises a reamer body and a central pipe, the two ends of the reamer while drilling are connected with the centralizer and the well measurement equipment respectively, the central pipe is movably installed in the reamer body in the axial direction, a plurality of blade installation holes in one-to-one correspondence with the ejector rods are formed in the side wall of the reamer body, and each blade installation hole is provided with a blade in a matched mode. The locking device is connected with the sleeve, torque and bit pressure are applied to the sleeve through the top drive and transmitted to the drill bit part, drilling is conducted through the drill bit part, meanwhile, stratum information can be accurately recognized while drilling is conducted through well measurement equipment, while-drilling controllable reaming is achieved through a reamer while drilling, reaming can be guaranteed while drilling is conducted, and the drilling efficiency is improved. While the casing pipe is allowed to be expanded, directional efficient drilling operation of the casing pipe is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of casing directional drilling, in particular to a casing directional logging-while-drilling tool. Background Art

[0002] Casing directional drilling combines casing drilling technology and directional well technology. The casing is used to replace the drill pipe in the directional well for downhole drilling. After drilling, the casing is directly left in the well to achieve the purpose of one-trip drilling and casing running. In some cases, the reaming tool used in casing directional drilling opens and closes the cutter blades according to the drilling pressure, and it is impossible to accurately control whether the opening is successful. If there is resistance during the lowering process, the cutter blades may open in advance, resulting in downhole accidents. In addition, conventional casing directional drilling generally uses a measurement-while-drilling (MWD) instrument, which has a relatively single function and can only measure parameters such as tool face, well inclination, and azimuth to meet the requirements of directional drilling. Its intelligence is relatively low, and it is impossible to comprehensively understand the formation conditions during drilling, and then implement appropriate drilling techniques. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a casing directional logging-while-drilling tool to solve the problems existing in the above-mentioned prior art. The reaming operation will not affect the efficiency of casing directional drilling, and it can accurately identify formation information while conducting casing directional drilling, providing a reference for adjusting the drilling process.

[0004] To achieve the above purpose, the utility model provides the following solution: The utility model provides a casing directional logging-while-drilling tool, which includes a casing and a lock connected to the casing. The bottom end of the lock is sequentially connected with a centralizer, a reamer while drilling, a logging-while-drilling device, and a bit part;

[0005] The reamer while drilling includes a reamer body and a central tube both having a straight cylinder structure and arranged coaxially. The two ends of the reamer while drilling are respectively connected with the centralizer and the logging-while-drilling device, and the central tube is axially movably installed in the reamer body;

[0006] An elastic component is connected between the top end of the central tube and the reamer body; the bottom end of the central tube serves as a slurry outlet part and is used to cooperate with the input ball to build pressure; a first slurry outlet section and a plurality of ejector rods are arranged in the middle part of the central tube. The first slurry outlet section is located below the elastic component and is provided with a plurality of first slurry outlet holes surrounding the outer periphery of its axis. Each ejector rod is located below the first slurry outlet section, extends radially along the central tube, and surrounds the outer periphery of the central tube axis;

[0007] A plurality of cutter wing mounting holes corresponding to the respective ejector rods are formed in the side wall of the reamer body. Each cutter wing mounting hole is provided with a cutter wing. The top end of the cutter wing is hinged at the top end position of the cutter wing mounting hole. One side of the cutter wing close to the axis of the reamer body has an inclined surface abutting against the ejector rod. The inclined surface gradually inclines towards the outer peripheral side of the reamer body along the direction from the top end to the bottom end of the cutter wing. The part of the reamer body between the elastic component and the cutter wing mounting hole surrounds the outer peripheral side of the first slurry outlet section before the central pipe descends and blocks each first slurry outlet hole.

[0008] Preferably, a strip-shaped sliding groove for slidingly cooperating with the ejector rod is formed on one side of the cutter wing close to the axis of the reamer body. The end of the ejector rod not connected to the central pipe is embedded in the strip-shaped sliding groove. The strip-shaped sliding groove extends in the same direction as the cutter wing. The bottom of the strip-shaped sliding groove has an inclined surface structure and gradually inclines towards the outer peripheral side of the reamer body from the top end to the bottom end of the cutter wing.

[0009] Preferably, before the central pipe descends, the cutter wing is located in the cutter wing mounting hole, and the bottom of the strip-shaped sliding groove close to the elastic component is located on the outer peripheral side of the ejector rod.

[0010] Preferably, a first sealing portion having a cylindrical structure and coaxial with the reamer body is provided inside the reamer body. The first sealing portion protrudes from the inner wall of the reamer body and surrounds the outer peripheral side of the first slurry outlet section before the central pipe descends and blocks each first slurry outlet hole.

[0011] Preferably, a ring-shaped flange protruding from the outer peripheral wall is coaxially provided at the top end of the central pipe. The elastic component is provided between the ring-shaped flange and the first sealing portion.

[0012] Preferably, a second slurry outlet hole for fitting and pressure holding with the input ball is formed at the bottom end of the slurry outlet portion. A plurality of third slurry outlet holes are formed on the outer peripheral wall of the slurry outlet portion. Each third slurry outlet hole surrounds the outer peripheral side of the axis of the slurry outlet portion.

[0013] A second sealing portion having a cylindrical structure and coaxial with the reamer body is provided inside the reamer body. The second sealing portion protrudes from the inner wall of the reamer body and surrounds the outer peripheral side of the slurry outlet portion before the central pipe descends and blocks each second slurry outlet hole.

[0014] A slurry outlet gap is formed between the inner wall of the reamer body and the outer wall of the central pipe. The slurry outlet gap is located below the second sealing portion.

[0015] Preferably, a slurry outlet pipe is coaxially and detachably inserted into the slurry outlet part. The slurry outlet pipe is used for sliding cooperation with the slurry outlet part, and fourth slurry outlet holes for corresponding connection and communication with the third slurry outlet holes one by one are formed in the outer wall of the slurry outlet pipe.

[0016] Preferably, the locker, the centralizer, the hole enlarger while drilling, the measurement-while-drilling equipment and the bit part are connected in sequence by means of threaded connection.

[0017] Preferably, the bit part includes a bit, and a reducing sub is connected between the bit and the measurement-while-drilling equipment.

[0018] Preferably, the measurement-while-drilling equipment includes a near-bit measurement assembly, a hollow screw assembly, an electromagnetic coupling transmission sub, a rear resistivity assembly, a signal line telescopic rod assembly and an orientation sub; the near-bit measurement assembly is used for real-time measurement of formation information, and a gamma measurement instrument is also built in the near-bit measurement assembly. The hollow screw assembly is connected with the near-bit measurement assembly by means of threaded connection; the inside of the near-bit measurement assembly and the inside of the hollow screw assembly are connected by an aviation plug, and a battery for supplying power to the near-bit measurement assembly is installed in the hollow screw assembly; the rear resistivity assembly and the electromagnetic coupling transmission sub are connected by means of threaded connection, and the signal transmission between the electromagnetic coupling transmission sub and the rear resistivity assembly is connected by an electric wire; a non-magnetic drill pipe is connected with the rear resistivity assembly by means of threaded connection. The near-bit measurement assembly, the rear resistivity assembly and the gamma measurement instrument are used for checking formation data; the inside of the rear resistivity assembly is connected with the lower end of the signal line telescopic rod assembly; the upper end of the signal line telescopic rod assembly is connected with a MWD instrument with a rotary valve. The MWD instrument with a rotary valve is installed in the orientation sub and fixed in orientation by bolts.

[0019] The utility model has achieved the following technical effects compared with the prior art:

[0020] The whole device connects the casing through the locker to apply torque and drilling pressure on the casing by using the top drive and transmit them to the bit part, and uses the bit part for drilling. At the same time, the measurement-while-drilling equipment can accurately identify formation information while drilling, and the hole enlarger while drilling is used to realize controllable hole enlargement while drilling, and it can ensure hole enlargement while drilling, allowing the casing to be lowered while enlarging, completing one-trip drilling of measurement-while-drilling directional drilling - hole enlargement - casing running, and realizing high-efficiency directional drilling operation of the casing. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the entire casing directional logging-while-drilling tool in an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the hole opener while drilling in an embodiment of the present invention Figure 1 ;

[0024] Figure 3 It is a schematic diagram of the structure of the hole opener while drilling in an embodiment of the present invention Figure 2 ;

[0025] Among them, 1 - locking device, 2 - casing short section, 3 - centralizer, 4 - directional joint, 5 - non-magnetic drill pipe, 6 - rear resistivity assembly, 7 - electromagnetic coupling transmission short section, 8 - hollow screw assembly, 9 - near-bit measurement assembly, 10 - reducer joint, 11 - drill bit, 12 - hole opener while drilling, 13 - hole opener body, 14 - cutter blade, 15 - strip-shaped chute, 16 - annular flange, 17 - spring, 18 - central tube, 19 - ejector rod, 20 - slurry outlet pipe, 21 - first slurry outlet hole, 22 - first plugging part, 23 - fourth slurry outlet hole, 24 - second plugging part, 25 - cutter blade mounting hole, 26 - second slurry outlet hole, 27 - third slurry outlet hole. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a casing directional logging-while-drilling tool to solve the problems existing in the above-mentioned prior art, to solve the problem of encountering resistance before reaching the designed depth, and the reaming work will not affect the drilling of the drill bit, and thus will not affect the efficiency of the casing directional drilling, and can accurately identify the formation information while performing the casing directional drilling, providing a reference for the adjustment of the drilling process.

[0028] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] As Figures 1 to 3 shown, this embodiment provides a casing directional logging-while-drilling tool, including a casing and a lock 1 connected to the casing. At the bottom end of the lock 1, a centralizer 3, a hole enlarger 12 while drilling, a measurement device while drilling, and a bit 11 are connected in sequence;

[0030] Among them, the hole enlarger 12 while drilling includes a hole enlarger body 13 and a central tube 18 that are both in a straight cylinder structure and coaxially arranged. The central tube 18 is axially movably installed in the hole enlarger body 13; an elastic component is connected between the top end of the central tube 18 and the hole enlarger body 13; the bottom end of the central tube 18 serves as a slurry outlet part and is used to cooperate with the input ball to build pressure. Before the ball is input, the slurry passes through the bottom end of the central tube 18. When the ball is input, the input ball blocks the bottom end of the central tube 18, and the slurry builds pressure at the bottom end position of the central tube 18, causing the central tube 18 to move downward. And preferably, after building pressure, the opening of the cutter blades 14 can be judged by the pump pressure; a first slurry outlet section and a plurality of ejector rods 19 are provided in the middle part of the central tube 18. The first slurry outlet section is located below the elastic component and is provided with a plurality of first slurry outlet holes 21 surrounding the outer periphery of its axis. Each ejector rod 19 is located below the first slurry outlet section and extends radially along the central tube 18 and surrounds the outer periphery of the axis of the central tube 18; a plurality of cutter blade mounting holes 25 corresponding to each ejector rod 19 one by one are provided on the side wall of the hole enlarger body 13. Each cutter blade mounting hole 25 is equipped with a cutter blade 14. The top end of the cutter blade 14 is hinged at the top end position of the cutter blade mounting hole 25. The side of the cutter blade 14 close to the axis of the hole enlarger body 13 has an inclined surface abutting against the ejector rod 19. The inclined surface gradually inclines toward the outer periphery of the hole enlarger body 13 along the direction from the top end to the bottom end of the cutter blade 14. After the ball is input, the central tube 18 drives the ejector rod 19 to move downward, and the ejector rod 19 moves along the inclined surface of the cutter blade 14 and gradually opens the cutter blade 14 to start drilling and complete the hole enlarging work; the part of the hole enlarger body 13 between the elastic component and the cutter blade mounting hole 25 surrounds the outer periphery of the first slurry outlet section before the central tube 18 moves downward and blocks each first slurry outlet hole 21. Thus, by blocking the first slurry outlet holes 21 before the central tube 18 moves downward, the slurry flows out from the slurry outlet part. After the central tube 18 moves downward, the first slurry outlet section moves downward with the central tube 18 and moves to the cutter blade mounting hole 25, so that the slurry flows out from the first slurry outlet holes 21 and flows out of the hole enlarger body 13 through the cutter blade mounting holes 25. And by setting the elastic component, after the drilling work is completed, the slurry outlet part is no longer under pressure, so that the entire central tube 18 can move upward under the action of the elastic component, and then the cutter blade 14 is no longer supported by the ejector rod 19 and retracts.

[0031] The underreamer 12 disclosed by the utility model, before the ball is dropped, the mud passes through the slurry outlet part of the central pipe 18, and circulating the slurry or applying the drilling pressure will not cause the cutter blades 14 to open, and non-underreaming drilling can be carried out; when the ball is dropped after reaching the designed underreaming well depth, the mud is pressured at the slurry outlet part, so that the central pipe 18 moves downward, the ejector rod 19 moves downward accordingly, and the cutter blades 14 are pushed outwards to open, realizing controllable underreaming while drilling, and solving the situation of encountering resistance before reaching the designed depth.

[0032] Furthermore, the whole device is connected to the casing through the lock 1, so as to apply torque and drilling pressure on the casing by using the top drive and transmit them to the drill bit 11 part, and use the drill bit 11 part to carry out drilling. At the same time, the formation information can be accurately identified while drilling by using the logging-while-drilling equipment. The controllable underreaming while drilling is realized by using the underreamer 12, and it can ensure underreaming while drilling, allowing the casing to be lowered while being underreamed, completing the one-trip operation of logging-while-drilling directional drilling - underreaming - casing running, and realizing the high-efficiency directional drilling operation of the casing.

[0033] Moreover, preferably, the lock 1, the centralizer 3, the underreamer 12, the logging-while-drilling equipment and the drill bit 11 part are connected in a threaded connection manner in sequence, so as to be able to quickly complete the installation and connection work of the whole device; the casing nipple 2 is placed at the wellhead of the drilling rig, and the drill strings are connected in sequence starting from the drill bit 11 part. When the underreamer 12 is in the initial state before the ball is dropped, the cutter blades 14 are closed and can pass through the casing nipple 2. After the lock 1 and the centralizer 3 are connected, the lock 1 is pressed down to feed the shaft and set it, so that the lock 1 is connected to the casing nipple 2. Among them, after the lock 1 is set, the wellhead drill string connection is completed. The remaining casing nipples 2 are connected above the lock 1, and then the drill string can be lowered. After the drill string is lowered to the specified depth, the ball is dropped, the pump is started, the mud is pressured at the underreamer 12, and the cutter blades 14 are opened to start drilling and underreaming. The lock 1 is used to make the overall drill string assembly structure a suspended drill string, which can effectively transfer the drilling pressure and torque in the drilling operation to the drill bit 11 through the casing, and the setting is simple and the recovery success rate is high. The function of the centralizer 3 is to guide the drill string below the lock 1, avoid the circumferential swing of the drill string below the lock 1 during the drilling process, and relieve the fatigue damage of the lock 1. And preferably, the drill bit 11 part includes the drill bit 11, and a reducing sub 10 is connected between the drill bit 11 and the logging-while-drilling equipment.

[0034] As a preferred embodiment of the present utility model, a strip-shaped chute 15 slidably engaged with the ejector rod 19 is provided on one side of the cutter blade 14 close to the axis of the reamer body 13. One end of the ejector rod 19 not connected to the central tube 18 is embedded in the strip-shaped chute 15. The strip-shaped chute 15 extends in the same direction as the cutter blade 14. The bottom of the strip-shaped chute 15 is of an inclined surface structure and gradually inclines towards the outer peripheral side of the reamer body 13 from the top end to the bottom end of the cutter blade 14. By engaging the strip-shaped chute 15 with the ejector rod 19, the stability of the ejector rod 19 in ejecting the cutter blade 14 is improved, and the situation that the position where the ejector rod 19 abuts against the cutter blade 14 is unstable, resulting in the inability to effectively and stably support the cutter blade 14 during the reaming process, is avoided. Among them, the cutter blade 14 is located in the cutter blade mounting hole 25 before the central tube 18 descends, and the bottom of the strip-shaped chute 15 close to the elastic component is located on the outer peripheral side of the ejector rod 19, so as to ensure that after the cutter blade 14 is retracted, it no longer abuts against the ejector rod 19, and further enables the cutter blade 14 to be fully closed, avoiding opening before the ball is thrown.

[0035] In one embodiment, a first plugging portion 22 having a cylindrical structure and coaxial with the reamer body 13 is provided inside the reamer body 13. The first plugging portion 22 protrudes from the inner wall of the reamer body 13 and surrounds the outer peripheral side of the first slurry outlet section before the central tube 18 descends, and plugs each first slurry outlet hole 21. It should be noted that the inner hole of the first plugging portion 22 is slidably engaged with the first slurry outlet section and has a matching structure, which can not only ensure that the first slurry outlet section can slide within the first plugging portion 22 after the ball is thrown, but also realize the effective plugging of the first slurry outlet holes 21 through the first plugging portion 22.

[0036] In one embodiment, a ring-shaped flange 16 protruding from the outer peripheral wall is coaxially provided at the top end of the central tube 18. An elastic component is provided between the ring-shaped flange 16 and the first plugging portion 22. Preferably, the elastic component is a spring 17 sleeved on the outer peripheral side of the central tube 18, so as to ensure the stability of the connection of the elastic component and be able to apply a balanced restoring force to the central tube 18.

[0037] In one embodiment, a second slurry outlet hole 26 that is fitted and pressure-blocked with the input ball is formed at the bottom end of the slurry outlet part. A plurality of third slurry outlet holes 27 are formed on the outer peripheral wall of the slurry outlet part, and each third slurry outlet hole 27 surrounds the outer peripheral side of the axis of the slurry outlet part. A second blocking part 24 with a cylindrical structure and coaxial with the inside of the reamer body 13 is provided. The second blocking part 24 protrudes from the inner wall of the reamer body 13 and surrounds the outer peripheral side of the slurry outlet part before the central pipe 18 descends, and blocks each second slurry outlet hole 26. Preferably, the inner hole of the second blocking part 24 is in sliding fit with the slurry outlet part and has a matching structure. There is a slurry outlet gap between the inner wall of the reamer body 13 and the outer wall of the central pipe 18, and the slurry outlet gap is located below the second blocking part 24. Before the ball is thrown, the second blocking part 24 blocks each third slurry outlet hole 27, and the slurry flows out from the second slurry outlet hole 26 to the drill bit 11. After the ball is thrown, the central pipe 18 drives the slurry outlet part to move downward, so that the second slurry outlet hole 26 is exposed from the second blocking part 24 and flows to the drill bit 11 through the slurry outlet gap, so that the reaming operation will not affect the drilling of the drill bit 11, and thus will not affect the casing directional drilling efficiency.

[0038] Further, a slurry outlet pipe 20 is detachably inserted coaxially in the slurry outlet part. The slurry outlet pipe 20 is used for sliding fit with the slurry outlet part. Fourth slurry outlet holes 23 for communicating with each third slurry outlet hole 27 in one-to-one correspondence are formed on the outer wall of the slurry outlet pipe 20, so as to cooperate with the input ball through the slurry outlet pipe 20 to block the pressure. Before the ball is thrown, the slurry outlet pipe 20 is located inside the slurry outlet part. After the ball is thrown, the slurry outlet pipe 20 is separated from the slurry outlet part and descends, and the third slurry outlet holes 27 can be correspondingly communicated with each fourth slurry outlet hole 23. Specifically and preferably, the radial cross-section of the slurry outlet pipe 20 gradually decreases from top to bottom, so as to improve the effectiveness of its fitting with the input ball, and thus improve the pressure-blocking effect.

[0039] Furthermore, the measurement-while-drilling (MWD) equipment includes a near-bit measurement assembly 9, a hollow screw assembly 8, an electromagnetic coupling transmission sub 7, a rear resistivity assembly 6, a signal line telescopic rod assembly, and a directional sub 4. The near-bit measurement assembly 9 is used for real-time measurement of formation information. The near-bit measurement assembly 9 also incorporates a gamma measurement instrument. The hollow screw assembly 8 is threadedly connected to the near-bit measurement assembly 9. The interior of the near-bit measurement assembly 9 is connected to the interior of the hollow screw assembly 8 by an aviation plug. A battery for supplying power to the near-bit measurement assembly 9 is installed inside the hollow screw assembly 8. The rear resistivity assembly 6 is threadedly connected to the electromagnetic coupling transmission sub 7, and the signal transmission between the electromagnetic coupling transmission sub 7 and the rear resistivity assembly 6 is connected by an electric wire. The non-magnetic drill pipe 5 is threadedly connected to the rear resistivity assembly 6. The near-bit measurement assembly 9, the rear resistivity assembly 6, and the gamma measurement instrument are used for verifying formation data. The interior of the rear resistivity assembly 6 is connected to the lower end of the signal line telescopic rod assembly. The upper end of the signal line telescopic rod assembly is connected to a rotary valve MWD instrument. The rotary valve MWD instrument is installed inside the directional sub 4 and fixed in orientation by bolts. Another installation method can also be selected, that is, the key-seating type, where the directional sub 4 is at the bottom and the non-magnetic drill pipe 5 is at the top. The entire MWD equipment extends beyond the casing sub 2, and the casing sub 2 does not affect the logging-while-drilling (LWD) measurement results. As other embodiments, the drill string can also be combined with technologies such as pressure-while-drilling (PWD), acoustic-while-drilling (AWD), seismic-while-drilling (SWD), nuclear magnetic resonance logging-while-drilling (NMR-LWD), and formation evaluation while drilling (FEWD).

[0040] The entire drill string can achieve logging-while-drilling through the MWD equipment, identify formation information, and accurately drill to the target. Correct construction techniques are adopted according to the formation information, and sliding drilling or compound drilling is selected according to the formation characteristics. For example, in a formation prone to lost circulation, compound drilling is carried out. Utilizing the characteristics of the large outer diameter of the casing and the small clearance with the wellbore wall, a dense mud cake is formed in the annulus between the casing and the wellbore wall to avoid lost circulation accidents. In a formation prone to hole shrinkage, a reaming bit 11 is used for in-situ reaming operations to expand the hole diameter in this well section and prevent sticking. At the same time, logging-while-drilling (LWD) can judge whether the target formation is encountered and whether it coincides with the designed well depth through parameters such as resistivity and gamma, improving the success rate of drilling into the target formation. Moreover, the MWD equipment adopts electromagnetic coupling information transmission technology, which has good stability, reduces the influence of seawater on information transmission, and is suitable for casing directional drilling in complex marine formations. It is also suitable for land drilling.

[0041] Adaptations made according to actual requirements are all within the protection scope of the present utility model.

[0042] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0043] Specific examples are used in the present utility model to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A casing directional logging-while-drilling tool, characterized in that It includes a casing and a lock connected to the casing. The bottom end of the lock is successively connected with a centralizer, an underreamer, a measurement-while-drilling device, and a bit part; The underreamer includes an underreamer body and a central tube which are both in a straight cylinder structure and arranged coaxially. The two ends of the underreamer are respectively connected with the centralizer and the measurement-while-drilling device, and the central tube is axially movably installed in the underreamer body; An elastic component is connected between the top end of the central tube and the underreamer body; the bottom end of the central tube serves as a slurry outlet part and is used for cooperating with the inserted ball to build pressure; a first slurry outlet section and a plurality of ejector rods are arranged in the middle part of the central tube. The first slurry outlet section is located below the elastic component and is provided with a plurality of first slurry outlet holes surrounding the outer periphery of its axis. Each ejector rod is located below the first slurry outlet section, extends radially along the central tube, and surrounds the outer periphery of the central tube axis; A plurality of cutter wing mounting holes corresponding to each ejector rod are arranged on the side wall of the underreamer body. Each cutter wing mounting hole is equipped with a cutter wing. The top end of the cutter wing is hinged at the top position of the cutter wing mounting hole. One side of the cutter wing close to the axis of the underreamer body has an inclined surface abutting against the ejector rod. The inclined surface gradually inclines towards the outer periphery of the underreamer body along the direction from the top end to the bottom end of the cutter wing; the part of the underreamer body between the elastic component and the cutter wing mounting hole surrounds the outer periphery of the first slurry outlet section and blocks each first slurry outlet hole before the central tube descends.

2. The casing orientation measurement-while-drilling tool according to claim 1, wherein A strip-shaped chute for slidingly cooperating with the ejector rod is arranged on one side of the cutter wing close to the axis of the underreamer body. The end of the ejector rod not connected to the central tube is embedded in the strip-shaped chute. The strip-shaped chute extends in the same direction as the cutter wing. The bottom of the strip-shaped chute is in an inclined surface structure and gradually inclines towards the outer periphery of the underreamer body from the top end to the bottom end of the cutter wing.

3. The casing orientation while-drilling logging tool according to claim 2, characterized in that, Before the central tube descends, the cutter wing is located in the cutter wing mounting hole, and the bottom of the strip-shaped chute close to the elastic component is located on the outer periphery of the ejector rod.

4. The casing directional logging-while-drilling tool according to claim 2 or 3, characterized in that, A first sealing part which is coaxial with the underreamer body and in a cylindrical structure is arranged inside the underreamer body. The first sealing part protrudes from the inner wall of the underreamer body, surrounds the outer periphery of the first slurry outlet section before the central tube descends, and blocks each first slurry outlet hole.

5. The casing orientation while-drilling logging tool according to claim 4, characterized in that, A ring flange protruding from the outer peripheral wall is coaxially arranged at the top end of the central tube. The elastic component is arranged between the ring flange and the first sealing part.

6. The casing orientation while-drilling logging tool according to claim 5, wherein, The bottom end of the slurry outlet part is provided with a second slurry outlet hole for fitting and building pressure with the inserted ball. A plurality of third slurry outlet holes are arranged on the outer peripheral wall of the slurry outlet part. Each third slurry outlet hole surrounds the outer periphery of the axis of the slurry outlet part; A second sealing part which is coaxial with the underreamer body and in a cylindrical structure is arranged inside the underreamer body. The second sealing part protrudes from the inner wall of the underreamer body, surrounds the outer periphery of the slurry outlet part before the central tube descends, and blocks each second slurry outlet hole; There is a slurry outlet gap between the inner wall of the reamer body and the outer wall of the central pipe, and the slurry outlet gap is located below the second plugging portion.

7. The casing orientation while-drilling logging tool according to claim 6, wherein, A slurry outlet pipe is coaxially and detachably inserted into the slurry outlet portion. The slurry outlet pipe is used for sliding cooperation with the slurry outlet portion, and fourth slurry outlet holes corresponding to and communicating with each of the third slurry outlet holes are formed on the outer wall of the slurry outlet pipe.

8. The casing directional logging-while-drilling tool according to claim 7, characterized in that, The locking device, the centralizer, the reamer while drilling, the measurement-while-drilling equipment and the bit part are connected in sequence by means of threaded connection.

9. The casing orientation LWD drill string according to claim 8, characterized in that, The bit part includes a bit, and a reducing joint is connected between the bit and the measurement-while-drilling equipment.

10. The casing orientation measurement-while-drilling tool according to claim 9, characterized in that, The measurement-while-drilling equipment includes a near-bit measurement assembly, a hollow screw assembly, an electromagnetic coupling transmission sub, a rear resistivity assembly, a signal line telescopic rod assembly and a directional joint; The near-bit measurement assembly is used for real-time measurement of formation information. The near-bit measurement assembly is also internally provided with a gamma measurement instrument. The hollow screw assembly is connected to the near-bit measurement assembly by means of threaded connection; the interior of the near-bit measurement assembly and the interior of the hollow screw assembly are connected by an aviation plug. A battery for supplying power to the near-bit measurement assembly is installed in the hollow screw assembly; the rear resistivity assembly is connected to the electromagnetic coupling transmission sub by means of threaded connection, and signal transmission between the electromagnetic coupling transmission sub and the rear resistivity assembly is connected by an electric wire; a non-magnetic drill pipe is connected to the rear resistivity assembly by means of threaded connection. The near-bit measurement assembly, the rear resistivity assembly and the gamma measurement instrument are used for checking formation data; the interior of the rear resistivity assembly is connected to the lower end of the signal line telescopic rod assembly; the upper end of the signal line telescopic rod assembly is connected to a MWD instrument with a rotary valve. The MWD instrument with a rotary valve is installed in the directional joint and fixed in position by bolts.

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