A wireless transmission device for cable-free well logging system

Abstract

The present invention discloses a wireless transmission device for a cable-free logging system, comprising a drilling tool assembly (1) and a release buffer pulser assembly (2) arranged inside the drilling tool assembly (1), wherein the release buffer pulser assembly (2) comprises a release buffer (21), a reed switch (22), a pulse generator (23), a lower buffer (24) and an instrument interface (25) connected in sequence. The wireless transmission device for a cable-free logging system provided by the present invention can effectively monitor the release of the instrument, avoid the blindness of the pump-out logging operation, effectively protect the instrument, and improve the success rate and work efficiency of logging.

Description

Technical Field

[0001] The invention relates to the field of petroleum well logging, and in particular to a wireless transmission device used in a wireless cable well system. Background Art

[0002] The current cable-free logging system adopts the original drill pipe delivery pump-out storage type, which consists of an external drill tool protection cover and a releaser and instrument located inside the protection cover. The external drill tool protection cover is mainly composed of an upper suspension, a lower suspension, etc. Its main function is to connect the instrument to the drill tool, suspend and fix the instrument, so that the instrument is fixed in the drill pipe during the lowering process and remains motionless to prevent the instrument from escaping from the drill pipe. A mechanical releaser and an instrument string combination are hung inside the protection cover. The function of the releaser is to release the instrument by dropping a ball on the ground when the instrument reaches the bottom of the well. The instrument is located in the protection cover, which can prevent the instrument from contacting the formation, thereby protecting the instrument. However, there are the following problems:

[0003] First, during the lowering of the instrument, if the shear pin is cut off prematurely for some reason, causing the instrument to be released prematurely, and the ground is still unaware of it, continuing to lower the instrument will cause damage to the instrument.

[0004] Secondly, after releasing the ball, whether the shear pin has been cut off and whether the instrument has been successfully pumped out from the drill bit, judging whether the shearing and pumping are successful only from the ground according to the change of mud pressure, still cannot get a definite conclusion; for example, when the shear pin is cut off, the mud column pressure will rise sharply, and obvious pressure changes should be seen on the ground, but because the pressure holding and shearing occur in an instant, the time is only a few milliseconds, and the software collects pressure values ​​dozens of times per second, it is very likely that the high-pressure peak has ended in the gap of collection, and the collected secondary peak may be submerged in the background noise. On the other hand, as the well depth increases, the pulse will decay with the well depth. Such a narrow pulse width may have decayed completely during the upload, so the probability of capturing the peak is not high. There is also the contrast pressure after the instrument is pumped out. Since the changes in the annulus before and after the water eye is opened are not very obvious, and the pressure change is not very significant, the instrument is often pumped out, but the pump pressure is still increased according to the procedure before it is pumped out until the pump pressure is highest, and it is circulated for a considerable period of time to ensure that the instrument is pumped out. As a result, the thrust on the instrument is too large, and the instrument often breaks during actual operation.

[0005] Secondly, during the instrument lowering process or when the instrument is pumped out, the instrument may not work properly due to vibration or other reasons, but the ground personnel cannot judge whether the instrument is normal and still perform logging operations normally, wasting valuable time. Summary of the invention

[0006] The present invention aims to overcome the problem of signal distortion generated during the use of the cableless logging system in the prior art, and provides a wireless transmission device for a wireless cable logging system, which can effectively monitor the release of the instrument, avoid the blindness of the pump-out logging operation, effectively protect the instrument, and improve the logging success rate and work efficiency.

[0007] The present invention provides a wireless transmission device for a wireless cable logging system, comprising a drilling tool assembly and a release buffer pulser assembly arranged inside the drilling tool assembly, wherein the release buffer pulser assembly comprises a release buffer, a reed switch, a pulse generator, a lower buffer and an instrument interface connected in sequence.

[0008] The release buffer pulser combination organically combines the release buffer and the pulse generator. When the instrument is transported underground, it can fix and suspend the instrument in the drill bit. When the instrument reaches the bottom of the well, the shear pin of the release buffer is cut off by throwing a ball on the ground, so that the release buffer can be separated from the suspension on the drill bit, which plays the role of both suspending the instrument and releasing the instrument. It has two upper and lower buffer devices. The upper buffer spring is used to buffer the impact force of the mud being released after the shear pin is sheared, and the lower buffer device is used to buffer the impact force of the releaser when it lands in the lower suspension. The buffer devices at both locations play the role of buffering and protecting the instrument. The reed switch is used as a proximity switch. When it passes near the permanent magnet on the drill bit, it generates a signal to determine that the instrument has been released successfully, and then sends a mud pulse signal to the ground through the pulse generator to notify the ground that the instrument has been released successfully. The pulse generator of the lower seat key can send pulse signals during the process of conveying the instrument downward, and before and after the instrument reaches the bottom of the well. The pulser is driven by the driving circuit to drive the electromagnetic servo valve, push the large valve through the small valve, change the cross-sectional area of ​​the annulus through which the mud flows in the water eye of the drilling tool, generate mud pressure pulse signals, and upload the instrument status and whether the release is successful to the ground, providing important information for ground operations. The instrument interface is used to connect the instrument string, which constitutes the mechanical and circuit interface between the instrument and the pulse generator.

[0009] The reed switch, also known as the magnetic switch, can be used as a proximity switch. A reed switch is installed after the release buffer, and a permanent magnet is installed on the drill bit suspended near the bottom as a trigger device for the magnetic switch. When the instrument is not released, the magnetic switch is in a normally open state. When the instrument is released successfully, the mud pushes the release buffer to move in the downward hanging direction. When it passes the drill bit equipped with a permanent magnet, the magnetic switch closes and generates a signal of successful release.

[0010] Reed switches can be divided into three types according to the contact points: A, B, and C.

[0011] Type A: It is a normally open reed switch. The contacts are closed when an external magnetic field is applied, and remain open under normal circumstances.

[0012] Type B: A normally closed reed switch. The contacts open when an external magnetic field is applied, and remain closed normally.

[0013] Type C: Transfer switch type.

[0014] Reed switches can be divided into the following categories according to their functions:

[0015] Non-self-maintaining type: Has the characteristic of being able to function depending on the presence or absence of an external magnetic field (monostable type).

[0016] Self-maintaining type: Once it works, it can maintain its original state even if the external magnetic field is removed (bistable type).

[0017] The present invention selects the A-type self-holding type of the middle reed switch.

[0018] In order to realize the transmission of the signal sent by the reed switch, a pulse generator is added between the release buffer and the instrument. At the same time, in order to reduce the attenuation of the mud pulse signal by the buffer spring, the lower buffer and suspension of the release buffer are moved down between the pulse generator and the instrument. The pulse generator transmits the signal of whether the instrument is in normal state and whether the release is successful to the ground through the coding mud pulse pressure signal, so that the ground can grasp the status of the downhole instrument in real time and determine whether the pumping is successful, so as to decide the next operation.

[0019] The wireless transmission device for a wireless cable logging system described in the present invention, as a preferred embodiment, the drill tool combination includes an upper suspension component, a drill pipe protective cover, a magnetic short section and a lower suspension component connected in sequence; the upper suspension component includes an upper suspension upper and an upper suspension lower connected in sequence, an API thread connected to the drill pipe of the well team is provided at the upper end of the upper suspension, a positioning step for axially positioning the release buffer is provided on the upper suspension, and a positioning hole for installing a positioning screw is provided on the side surface of the upper suspension, and the positioning screw is used for radially positioning the release buffer; the lower suspension component includes a lower suspension upper, a lower suspension middle and a lower suspension lower connected in sequence, the lower suspension upper is connected to the drill pipe protective cover, a drainage hole for the mud circulation channel outlet is provided on the side surface of the lower suspension middle, and a step is provided on the lower suspension lower to prevent the instrument from falling into the well.

[0020] There is a positioning step on the inner hole of the upper suspension, which is used to hang the release buffer and the instrument on this step surface, so that the axial position of the instrument remains unchanged during the lowering process to prevent the instrument from falling out of the drill pipe; there are also two positioning holes on the side of the upper suspension for installing positioning screws to radially position the releaser to prevent the releaser from rotating. The inner diameter of the upper suspension is also sealed with the pulse generator to achieve pulse signal transmission. The drill pipe protection sleeve is used to accommodate the instrument and connect the lower suspension and other drilling tools. The number can be increased or decreased according to the length of the instrument. The instrument is located in the protection sleeve, which can prevent the instrument from contacting the formation, thereby protecting the instrument. The magnetic short section is a short drill pipe equipped with a permanent magnet, which is used to generate a trigger signal for the reed switch. The lower suspension assembly is divided into the upper lower suspension, the middle lower suspension, and the lower lower suspension. The upper lower suspension is used to connect the drill tool protection sleeve. The inner diameter of the lower suspension also has a step that seals with the pulse generator to ensure the transmission of the pulse signal after the instrument is released. There are four drainage holes on the side of the lower suspension as the outlet of the mud circulation channel. The main function of the lower suspension is to guide the drill bit. It is the front end of the drill bit. When the instrument is released, its inner step is the instrument suspension surface. The large diameter of the lower buffer shaft cannot pass through this step to prevent the instrument from falling into the well.

[0021] The wireless transmission device for a wireless cable logging system described in the present invention, as a preferred embodiment, releases the buffer including a lifting sleeve matched with the drilling tool assembly, a ball arranged at one end of the lifting sleeve, a suspension seat connected to the other end of the lifting sleeve, a connecting shaft arranged inside the suspension seat, a shear pin arranged on one side of the connecting shaft, a buffer sleeve connected to the other end of the connecting shaft, an upper buffer shaft arranged on the other end of the buffer sleeve, an upper buffer spring arranged on the outside of the upper buffer shaft and a diversion shaft arranged at the other end of the upper buffer shaft.

[0022] The lifting sleeve is used to lift the release buffer assembly; the shear pin is used to cut off the connection and start the release; the connecting shaft is used to seal and hold pressure, and after the shear pin is cut off, the connecting shaft moves the instrument to release; the suspension seat is used to suspend the instrument string and the releaser pulser combination on the step where the end face of the suspension seat contacts the drill bit; the buffer sleeve is used to connect and fix the buffer shaft; the upper buffer shaft and the upper buffer spring are used to buffer the huge impact force of the shear pin shearing caused by the holding pressure process; the diverter shaft is used to connect and divert mud, so that the mud is diverted from the water eye in the center of the release buffer to the outside of the release buffer; the reed switch is used to determine whether the instrument release is successful; the ball and the connecting shaft are used together to hold pressure, cut the shear pin and release the instrument; the reed switch housing is used to fix the reed switch, connect the upper release buffer and the pulse generator, and a wiring hole is also opened on its side wall, which is connected to the pressure ring on the wiring tube to connect the pulser drive circuit with the instrument circuit at the lower end.

[0023] The wireless transmission device for a wireless cable logging system described in the present invention, as a preferred embodiment, the pulse generator includes a fixed seat connected to the release buffer, a drive circuit arranged on the fixed seat, an electromagnetic servo valve group arranged at the other end of the drive circuit, a main valve arranged at the other end of the electromagnetic servo valve group and in contact with the mud, and a shell arranged on the outside of the drive circuit, the electromagnetic servo valve group and the main valve; the electromagnetic servo valve group includes an excitation device, a small valve piston and a small valve connected in sequence, the excitation device is connected to the drive circuit, and the small valve is connected to the main valve; the main valve includes a valve cylinder connected to the small valve, a main valve piston connected to the other end of the valve cylinder, a main valve stem connected to the other end of the main valve piston, a main valve spring arranged on the outside of the valve cylinder, an oblique guide sleeve arranged on the outside of the main valve stem and a circulation sleeve arranged on the outside of the oblique guide sleeve.

[0024] The driving circuit is used to receive and process the reed switch and instrument status signals, encode and drive the excitation device to do work; the pressure isolation shell is used for connection and pressure isolation, and separates the high pressure of the oil chamber from the low pressure of the driving circuit chamber through the pressure-bearing joint; the oil filling hole is used to fill the hydraulic balance oil inlet; the excitation device is the core power element of the small valve; the small valve piston is used to isolate mud and hydraulic oil, balance the pressure, and compensate for the change in liquid volume when the small valve stem moves; the small valve is used to adjust the pressure in the large valve piston cavity through the switch valve port to control the movement of the large valve stem; the large valve spring is used for the force when the large valve closes the valve and the balancing force when the large valve opens; the large valve piston is used to connect the large valve stem and drive the mushroom head to move. The pressure difference on both sides of the piston determines the direction of piston movement, that is, the direction of movement of the mushroom head; the circulation sleeve is used to seal and control the flow rate of the flow channel; the mushroom head is used to generate a pulse pressure signal; the large valve stem is used to connect the piston and the mushroom head; the oblique guide sleeve is used to guide the large valve stem and locate the axial and center position of the mushroom head; the valve cylinder is used to connect and fix the large valve element.

[0025] According to the suspension method, the pulse generator can be divided into two types: upper suspension and lower seat key. The upper suspension pulse generator is connected to the drill bit through a suspension plate (the suspension plate is hung on the drill collar), and the suspension plate is connected to the valve body through a connecting rib. The valve body mushroom head and the suspension part are located at the upper end of the probe tube. Its suspension structure is not conducive to connecting with the releaser and releasing the instrument, and the flow channel is not conducive to ball casting; the lower seat key pulse generator, the valve body mushroom head and the seat key are located at the lower end of the instrument, the upper end can be connected to the releaser, and the lower end can be connected to the instrument, which has no effect on ball casting. Therefore, the lower seat key pulse generator is selected. The lower seat key pulser is a lower seat pulser, and the fixed seat is installed at the lowest end of the pulse generator. Its function is to change the flow area of ​​the mud through the action of the main valve head of the pulser hanging below, and realize the pressure signal transmission function. Its structural feature is that a small valve drives a large valve. The advantage of this function is that it uses less power to resist the pressure of mud flow and generate a larger mud pulse, saving electricity and effectively increasing the working time of the instrument.

[0026] When the pulse generator is in the initial working state, the valve needle of the small valve blocks the small valve hole under the action of the spring force, cutting off the fluid passage of the small valve. At this time, the small valve is in the closed state. The pressure P2 in the main valve piston chamber is less than the external pressure P1, so the main valve piston is subjected to an inward thrust, compressing the spring in the main valve head and moving leftward, thus driving the main valve stem to move leftward. Therefore, the main valve head is in the open state. At this time, it is the state of the maximum flow area, and the pressure relationship is: P1 > P2 > P3, where P3 is the pressure of the mud after flowing through the pulse generator. The main valve head piston is in pressure balance under the action of the spring force:

[0027] N2 + P2S = P1S

[0028] In the formula: N2 is the elastic force of the spring; S is the throttling area of the main valve.

[0029] Since the flow area is large, the value of the mud pressure P1 is small at this time. When the servo valve is opened, the main valve piston chamber of the pulse generator is connected to the external P1, and the internal pressure increases to P1. The pressure balance of the main valve piston is destroyed. Under the action of the spring force, the main valve piston drives the main valve to move rightward, reducing the flow area of the main valve to the minimum. At this time, the pressure P1 above the main valve suddenly increases, thus forming a pressure peak. At this time, the spring stretches, and the elastic force is N1. The pressure relationship is P l > P2 = P3. When the servo valve is closed, the connection between the main valve piston chamber and the external high-pressure P1 is cut off, and the pressure in the main valve piston chamber becomes P2. At this time, the pressure relationship becomes: N1 + P2S < P1S. The piston moves upward, driving the main valve to open the valve port, increasing the flow area, and at the same time compressing the spring. As the pressure P1 decreases, the elastic force increases, and finally returns to the initial pressure balance state.

[0030] In the high-pressure environment downhole, in order to avoid the movement of the small valve being affected by the pressure difference, a pressure balance device is adopted. The small valve and the excitation device are immersed in hydraulic oil to make the pressure of the excitation device equal to the external mud pressure, and are separated from the mud by a piston.

[0031] A wireless transmission device for a wireless cable logging system according to the present invention, as a preferred mode, the lower buffer includes a lower buffer shaft connected to the circulation sleeve, a rubber pad, a lower buffer spring, a suspension sleeve sequentially sleeved on the lower buffer shaft, and a first sealing ring arranged between the lower buffer shaft and the instrument interface.

[0032] The lower buffer shaft is used to connect the circulation sleeve and the instrument interface, and install the shock-absorbing spring, rubber pad and suspension sleeve; the rubber pad is used to continue shock absorption by the rubber pad after the buffer spring is compressed to the end when the impact is large; the lower buffer spring is used for shock absorption; the suspension sleeve is used to suspend the buffer when the instrument is released and reaches the lower suspension; the instrument interface is used for mechanical and electrical connection with the instrument; the first sealing ring is used for high-pressure sealing to prevent external mud from entering the instrument circuit cavity.

[0033] The wireless transmission device for a wireless cable logging system described in the present invention, as a preferred embodiment, further comprises a power supply wiring device arranged outside the pulse generator.

[0034] The pulse generator drive circuit and the instrument circuit are separated by an excitation device, a small valve, a large valve, a lower buffer and a suspension. The drive circuit needs to be provided with power and drive signals by the instrument circuit. The power supply wiring device can realize the power supply of the instrument circuit to the drive circuit and the transmission of instrument signals without affecting the normal operation of the pulse generator.

[0035] The wireless transmission device for a wireless cable logging system described in the present invention, as a preferred embodiment, the power supply wiring device includes an instrument circuit connected to the instrument interface for providing power to the pulse generator, a wire for connecting the instrument circuit and the pulse generator, and a wiring channel for positioning and guiding the wire; the wiring channel includes a first wiring channel arranged on the lower buffer shaft, a second wiring channel arranged on the circulation sleeve, and a third wiring channel arranged on the outside of the pulse generator, and the first wiring channel, the second wiring channel, and the third wiring channel are connected in sequence; the first wiring channel includes a first through hole arranged inside the lower buffer shaft, one end of the first through hole is connected to the instrument circuit, and the other end of the first through hole is connected to the second wiring channel; the second wiring channel The channel includes a second through hole arranged inside the circulation sleeve and a sealing sleeve arranged at one end of the second through hole, the sealing sleeve is connected to the third wiring channel, and the other end of the second through hole is connected to the first through hole; the third wiring channel includes a clamping ring sleeved on the shell and a wiring device fixedly connected to one side of the clamping ring; the clamping ring includes an upper clamping ring and a lower clamping ring that cooperate with each other, the upper clamping ring is fixedly connected to the end face of the reed switch shell by screws, the lower clamping ring is fixedly connected to the end face of the circulation sleeve by screws, and the wiring device is fixedly connected to the lower clamping ring; the wiring device includes a wiring rod fixedly connected to one side of the lower clamping ring and a wiring hole arranged inside the wiring rod and penetrating the wiring rod along the radial direction of the wiring rod, and the inner side of the wiring rod is provided with an arc surface with the same diameter as the shell.

[0036] Signals can be transmitted by cable, where the preparation of the cable transmission structure includes the following steps: first, the center of the lower buffer shaft is processed into a through hole to connect with the instrument circuit cavity, and then a wiring hole is processed in the wall of the circulation sleeve of the large valve to connect with the wiring tube fixed on the outside of the pulser, and the wiring tube is then connected with the wiring hole in the reed switch housing at the upper end, so as to introduce the wire from the instrument circuit at the lower end to the drive circuit. The contact surface between the wiring tube part and the adjacent parts is sealed with a sealing connecting tube.

[0037] The wireless transmission device for a wireless cable logging system described in the present invention is, as a preferred embodiment, provided with a first groove and a second groove on the outer wall of an upper clamping ring, the first groove and the circulation sleeve form a first mud flow channel, and the second groove and the circulation sleeve form a second mud flow channel; a third groove and a fourth groove are provided on the outer wall of a lower clamping ring, the third groove and the circulation sleeve form a third mud flow channel, and the fourth groove and the circulation sleeve form a fourth mud flow channel; a sealing sleeve is provided inside the lower clamping ring, one end of the sealing sleeve is connected to the wiring hole; a groove matching the step of the oblique guide sleeve is provided on the inner wall of the lower clamping ring.

[0038] The wireless transmission device for a wireless cable logging system described in the present invention is, as a preferred embodiment, provided with a sealing device between the drilling tool assembly and the release buffer pulser assembly, the sealing device comprising a first sealing device arranged on the upper inner wall of the upper suspension, a second sealing device arranged on the middle inner wall of the lower suspension and a third sealing device arranged on the circulation sleeve, a sealing ring 2 is provided on the outside of the third sealing device, the first sealing device contacts with the sealing ring 2 before the instrument is released, and the second sealing device contacts with the sealing ring 2 after the instrument is released.

[0039] During the use of the pulse generator, the mushroom head controls the flow area of ​​the water eye to make the mud produce pressure, so as to generate a pulse pressure signal. If the pulse signal is to be strong enough, the pressure holding effect must be good, that is, the clearance between the outer diameter of the circulation sleeve and the inner diameter of the drill bit should be as small as possible, and it is best to be completely sealed, so that the mud can flow around the mushroom head in the circulation sleeve hole. Reduce the inner diameter of the upper suspension at the local position where the upper suspension and the circulation sleeve match before release, and add a second sealing ring to the circulation sleeve. This ensures that the seal here is good before release. After the release begins, the circulation sleeve moves down, and the clearance with the inner diameter of the drill bit increases, which will not affect the release.

[0040] The wireless transmission device for a wireless cable logging system described in the present invention is, as a preferred embodiment, a first sealing device including a first boss, the first boss including a first plane in contact with the second sealing ring and a first inclined surface arranged on the first plane in the opposite direction of the instrument release; the second sealing device including a second boss, the second boss including a second plane in contact with the second sealing ring and a second inclined surface arranged on the second plane in the opposite direction of the instrument release; the third sealing device including a third boss arranged on the outside of the circulation sleeve and a groove arranged on the third boss, and the second sealing ring is embedded in the groove; the third boss includes a third plane and a third inclined surface arranged on the third plane in the release direction of the instrument, and the groove is arranged on the third plane.

[0041] Since a releaser is added to the upper end of the pulse generator, the mud first enters the inner hole of the releaser from the water hole of the drill bit, and then flows to the outside of the releaser. The annulus around the releaser and the inner diameter of the drill bit is also small, the entire flow channel is complex, the pulse signal is greatly attenuated, and there is also the flow blocking effect of the upper shock-absorbing spring, which affects the signal transmission effect. Solution: Use a long pulse width, that is, increase the pressure holding time. The pulse transmission rate of a normal MWD is generally 0.15-3bit / s. Since the signal transmitted by this pulse generator is only a small amount of information such as whether the instrument is released successfully and whether the working status of each instrument is normal, the amount of information transmitted is much less than that of the MWD. ​​Therefore, even if the lower limit of the pulse transmission rate is taken, the amount of information transmitted is sufficient for use. And when the well depth is large, in order to ensure reliable signal transmission, the transmission rate can be reduced to below 0.15bit / s. In addition, the mud displacement should be ensured to be 28-30 liters per second as much as possible. Small displacement is not conducive to signal transmission.

[0042] During use of the present invention, the instrument string is connected to the release buffer pulser combination, which is installed in the upper suspension component of the drilling tool combination through the release buffer and transported to the underground by the drill pipe. During the transportation process, the mud is circulated by turning on the mud pump, and the riser pressure signal is detected on the ground to know whether the underground instrument is in a normal state; when the drilling tool reaches the bottom of the well, the pump is continued to be turned on to confirm whether the underground instrument is normal; if the instrument is normal, a ball is dropped from the ground to release the releaser and the instrument string from the upper suspension component, and the pump is continued to be turned on to completely pump out the instrument, and the release buffer reaches the lower suspension component, the reed switch detects the magnetic signal, confirming that the release is successful, and the pulse generator sends a pumping success signal and an instrument status signal to the ground. After the ground receives the signal, the drilling tool is lifted up to start logging.

[0043] Since the release buffer and the pulse generator are organically combined in the present invention, the working status information of the instrument can be fed back to the ground in time by detecting the mud pressure pulse signal on the ground.

[0044] The present invention further selects a reed switch as a proximity switch, which can more accurately confirm whether the instrument is fully released and improve the accuracy of signal feedback.

[0045] The present invention further provides an external wiring tube on the wireless transmission device, thereby solving the connection problem between the instrument signal and power supply circuit and the pulse generator drive circuit.

[0046] The present invention further provides a sealing device between the drilling tool assembly and the release buffer pulser assembly, so that the instrument can feed back signals to the ground in time before and after the release and during the lowering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A diagram showing the composition of a wireless transmission device for a cable-free well logging system;

[0048] Figure 2 A diagram showing the composition of a wireless transmission device drilling tool assembly for a cable-free logging system;

[0049] Figure 3 A front view of a suspension assembly on a wireless transmission device for a cable-free well logging system;

[0050] Figure 4 It is a front view of a lower suspension assembly of a wireless transmission device for a cable-free well logging system;

[0051] Figure 5 A front view of a wireless transmission device release buffer pulser assembly for a cableless logging system;

[0052] Figure 6 A front view of a buffer release for a wireless transmission device for a cableless logging system;

[0053] Figure 7 It is a front view of a pulse generator of a wireless transmission device for a cable-free well logging system;

[0054] Figure 8 A main view of a wireless transmission device for a cable-free well logging system;

[0055] Fig. 9 It is a main view of a wiring channel of a wireless transmission device used in a cable-free well logging system;

[0056] Fig.10 A schematic diagram of a routing device for a wireless transmission device used in a cable-free well logging system;

[0057] Fig.11 a, 11 b are front views of a sealing device of a wireless transmission device for a cable-free well logging system before and after release, respectively;

[0058] Fig.12 A schematic diagram of a wireless transmission device for a cable-free logging system before release;

[0059] Fig.13 A schematic diagram of a wireless transmission device for a cable-free logging system after release.

[0060] Reference numerals:

[0061] 1. Drilling tool assembly; 11. Upper suspension assembly; 111. Upper suspension upper; 112. Upper suspension lower; 113. Positioning step; 12. Drill pipe protection cover; 13. Magnetic short joint; 14. Lower suspension assembly; 141. Lower suspension upper; 142. Lower suspension middle; 143. Lower suspension lower; 144. Leakage hole; 145. Step; 2. Release buffer pulser assembly; 21. Release buffer; 211. Lifting sleeve; 212. Ball; 213. Suspension seat; 214. Connecting shaft; 215. Shear pin; 216. Buffer sleeve; 217. Buffer shaft; 218. Buffer spring; 219. Diverter shaft; 22. Reed switch; 221. Reed switch housing; 23. Pulse generator; 231. Fixing seat; 232. Driving circuit; 233, electromagnetic servo valve group; 2331, excitation device; 2332, small valve piston; 2333, small valve; 234, main valve; 2341, valve cylinder; 2342, main valve piston; 2343, main valve stem; 2344, main valve spring; 2345, oblique guide sleeve; 2346, circulation sleeve; 235, shell; 24, lower buffer; 241, lower buffer shaft; 242, rubber pad; 243, lower buffer spring; 244, suspension sleeve; 245, sealing ring 1; 25, instrument interface; 3, wiring channel; 31, first wiring channel; 311, first through hole; 32, second wiring channel; 321, second through hole; 322, sealing sleeve; 33, third wiring channel; 331, clamping ring; 332. Routing device; 3321. Routing rod; 3322. Routing hole; 4. Sealing device; 41. First boss; 42. Second boss; 43. Third boss; 44. Second sealing ring. DETAILED DESCRIPTION

[0062] Example 1

[0063] like Figure 1 As shown, the present invention provides a wireless transmission device for a wireless cable logging system, including a drilling tool assembly 1, a release buffer pulser assembly 2 arranged inside the drilling tool assembly 1, a power supply wiring device arranged outside the pulse generator 23, and a sealing device 4 arranged between the drilling tool assembly 1 and the release buffer pulser assembly 2.

[0064] like Figure 2 As shown, the drilling tool assembly 1 includes an upper suspension assembly 11, a drill pipe protective cover 12, a magnetic short section 13 and a lower suspension assembly 14 connected in sequence; Figure 3As shown, the upper suspension assembly 11 includes an upper suspension upper 111 and an upper suspension lower 112 connected in sequence, an API thread connected to the drill pipe of the well team is provided at the upper end of the upper suspension 111, a positioning step 113 for axially positioning the release buffer 21 is provided on the upper suspension 111, and a positioning hole for installing a positioning screw is provided on the side of the upper suspension 111, and the positioning screw is used to radially position the release buffer 21; Figure 4 As shown, the lower suspension assembly 14 includes a lower suspension upper 141, a lower suspension middle 142 and a lower suspension lower 143 which are connected in sequence. The lower suspension upper 141 is connected to the drill pipe protective cover 12. A leakage hole 144 for the mud circulation channel outlet is provided on the side of the lower suspension middle 142. A step 145 is provided on the lower suspension lower 143 to prevent the instrument from falling into the well.

[0065] like Figure 5 As shown, the release buffer pulser assembly 2 includes a release buffer 21, a reed switch 22, a pulse generator 23, a lower buffer 24 and an instrument interface 25 which are connected in sequence.

[0066] like Figure 6 As shown, the release buffer 21 includes a lifting sleeve 211 connected to the drilling tool assembly, a ball 212 arranged at one end of the lifting sleeve 211, a suspension seat 213 connected to the other end of the lifting sleeve 211, a connecting shaft 214 arranged inside the suspension seat 213, a shear pin 215 arranged on one side of the connecting shaft 214, a buffer sleeve 216 connected to the other end of the connecting shaft 214, an upper buffer shaft 217 sleeved on the other end of the buffer sleeve 216, an upper buffer spring 218 arranged on the outside of the upper buffer shaft 217 and a diverter shaft 219 arranged at the other end of the upper buffer shaft 218.

[0067] like Figure 7 As shown, the pulse generator 23 includes a fixing seat 231 connected to the release buffer 21, a driving circuit 232 arranged on the fixing seat 231, an electromagnetic servo valve group 233 arranged at the other end of the driving circuit 232, a main valve 234 arranged at the other end of the electromagnetic servo valve group 233 and in contact with the mud, and a housing 235 arranged outside the driving circuit 232, the electromagnetic servo valve group 233 and the main valve 234; the electromagnetic servo valve group 233 includes an excitation device 2331, a small valve piston 2332 and a small valve 233 connected in sequence. 33. The excitation device 2331 is connected to the drive circuit 232, and the small valve 2332 is connected to the main valve 234; the main valve 234 includes a valve cylinder 2341 connected to the small valve 2332, a main valve piston 2342 connected to the other end of the valve cylinder 2341, a main valve stem 2343 connected to the other end of the main valve piston 2342, a main valve spring 2344 arranged on the outside of the valve cylinder 2341, an oblique guide sleeve 2345 arranged on the outside of the main valve stem 2343 and a circulation sleeve 2346 arranged on the outside of the oblique guide sleeve 2345.

[0068] like Figure 8 As shown, the lower buffer 24 includes a lower buffer shaft 241 connected to the circulation sleeve 2346, a rubber pad 242, a lower buffer spring 243, a suspension sleeve 244 and a sealing ring 245 arranged between the lower buffer shaft 241 and the instrument interface 25.

[0069] The power supply wiring device includes an instrument circuit connected to the instrument interface for providing power to the pulse generator, a wire for connecting the instrument circuit and the pulse generator, and a wiring channel 3 for positioning and guiding the wire; Fig. 9 As shown, the wiring channel 3 includes a first wiring channel 31 arranged on the lower buffer shaft 241, a second wiring channel 32 arranged on the circulation sleeve 2346, and a third wiring channel 33 arranged on the outside of the pulse generator 23. The first wiring channel 31, the second wiring channel 32, and the third wiring channel 33 are connected in sequence; the first wiring channel 31 includes a first through hole 311 arranged inside the lower buffer shaft 241, one end of the first through hole 311 is connected to the instrument circuit, and the other end of the first through hole 311 is connected to the second wiring channel 32; the second wiring channel 32 includes a second through hole 311 arranged inside the circulation sleeve 2346 321 and a sealing sleeve 322 arranged at one end of the second through hole 321, the sealing sleeve 322 is connected to the third wiring channel 33, and the other end of the second through hole 321 is connected to the first through hole 311; the third wiring channel 33 includes a clamping ring 331 sleeved on the housing 235 and a wiring device 332 fixedly connected to one side of the clamping ring 331; the clamping ring 331 includes an upper clamping ring and a lower clamping ring that cooperate with each other, the upper clamping ring is fixedly connected to the end face of the reed switch housing 221 by screws, the lower clamping ring is fixedly connected to the end face of the circulation sleeve 2346 by screws, and the wiring device 332 is fixedly connected to the lower clamping ring; Fig.10 As shown, the routing device 332 includes a routing rod 3321 fixedly connected to one side of the lower clamping ring and a routing hole 3322 arranged inside the routing rod 3321 and penetrating the routing rod 3321 in the radial direction of the routing rod 3321. The inner side of the routing rod 3321 is provided with an arc surface with the same diameter as the shell 235.

[0070] A first groove and a second groove are provided on the outer wall of the upper clamping ring, the first groove and the circulation sleeve 2346 form a first mud flow channel, and the second groove and the circulation sleeve 2346 form a second mud flow channel; a third groove and a fourth groove are provided on the outer wall of the lower clamping ring, the third groove and the circulation sleeve 2346 form a third mud flow channel, and the fourth groove and the circulation sleeve 2346 form a fourth mud flow channel; a sealing sleeve 322 is provided inside the lower clamping ring, one end of the sealing sleeve 322 is connected to the wiring hole 3322; a groove matching the step of the oblique guide sleeve 2345 is provided on the inner wall of the lower clamping ring.

[0071] like Fig.11As shown, the sealing device 4 includes a first sealing device 41 arranged on the inner wall of the upper suspension 111, a second sealing device 42 arranged on the inner wall of the lower suspension 142 and a third sealing device 43 arranged on the circulation sleeve 2346. A sealing ring 44 is provided on the outer side of the third sealing device 43. Before the instrument is released, the first sealing device 41 contacts with the sealing ring 44, and after the instrument is released, the second sealing device 42 contacts with the sealing ring 44.

[0072] The first sealing device 41 includes a first boss 411, the first boss 411 includes a first plane 4111 in contact with the second sealing ring 44 and a first inclined surface 4112 arranged on the first plane 4111 close to the opposite direction of the instrument release; the second sealing device 42 includes a second boss 421, the second boss 421 includes a second plane 4211 in contact with the second sealing ring 44 and a second inclined surface 4212 arranged on the second plane 4211 close to the opposite direction of the instrument release; the third sealing device 43 includes a third boss 431 arranged on the outside of the circulation sleeve 2346 and a groove 432 arranged on the third boss 431, and the second sealing ring 44 is embedded in the groove 432; the third boss 431 includes a third plane 4311 and a third inclined surface 4312 arranged on the third plane 4311 close to the instrument release direction, and the groove 432 is arranged on the third plane 4311.

[0073] During use of this embodiment, Fig.12 As shown, the instrument string is connected under the release buffer pulser assembly 2, and is installed in the upper suspension assembly 11 of the drilling tool assembly 1 through the release buffer 21, and is transported to the underground by the drill pipe. During the transportation process, the mud is circulated by turning on the mud pump, and the riser pressure signal is detected on the ground to know whether the underground instrument is in a normal state; when the drilling tool reaches the bottom of the well, the pump is continued to be turned on to confirm whether the underground instrument is normal; if the instrument is normal, a ball is dropped from the ground to release the release buffer 21 and the instrument string from the upper suspension assembly 11, and the pump is continued to be turned on to completely pump out the instrument, and the release buffer 21 reaches the lower suspension assembly 14, as shown in FIG. Fig.13 As shown, the reed switch 22 detects the magnetic signal, confirms the release is successful, and sends a pumping success signal and an instrument status signal to the ground through the pulse generator 23. After the ground receives the signal, the drilling tool is lifted up to start logging.

[0074] The above description is only illustrative rather than restrictive of the present invention. Those skilled in the art will understand that any modification, change or equivalent that can be made without departing from the spirit and scope defined by the claims will fall within the protection scope of the present invention.

Claims

1. A wireless transmission device for a cable-free logging system, Features: The invention comprises a drilling tool assembly (1) and a release buffer pulser assembly (2) arranged inside the drilling tool assembly (1), wherein the release buffer pulser assembly (2) comprises a release buffer (21), a reed switch (22), a pulse generator (23), a lower buffer (24), an instrument interface (25) and a power supply wiring device arranged outside the pulse generator (23) which are connected in sequence; The pulse generator (23) comprises a fixing seat (231) connected to the release buffer (21), a driving circuit (232) arranged on the fixing seat (231), an electromagnetic servo valve group (233) arranged at the other end of the driving circuit (232), a main valve (234) arranged at the other end of the electromagnetic servo valve group (233) and in contact with the mud, and a housing (235) arranged outside the driving circuit (232), the electromagnetic servo valve group (233) and the main valve (234); the electromagnetic servo valve group (233) comprises an excitation device (2331), a small valve piston (2332) and a small valve (2333) connected in sequence. , the excitation device (2331) is connected to the drive circuit (232), and the small valve (2333) is connected to the main valve (234); the main valve (234) comprises a valve cylinder (2341) connected to the small valve (2333), a main valve piston (2342) connected to the other end of the valve cylinder (2341), a main valve stem (2343) connected to the other end of the main valve piston (2342), a main valve spring (2344) arranged outside the valve cylinder (2341), an oblique guide sleeve (2345) arranged outside the main valve stem (2343), and a circulation sleeve (2346) arranged outside the oblique guide sleeve (2345); The power supply wiring device includes an instrument circuit connected to the instrument interface (25) for providing power to the pulse generator (23), a wire for connecting the instrument circuit and the pulse generator (23), and a wiring channel (3) for positioning and guiding the wire; the wiring channel (3) includes a first wiring channel (31) arranged on the lower buffer shaft (241), a second wiring channel (32) arranged on the circulation sleeve (2346), and a third wiring channel (33) arranged outside the pulse generator (23), wherein the first wiring channel (31) is provided on the lower buffer shaft (241), a second wiring channel (32) is provided on the circulation sleeve (2346), and a third wiring channel (33) is provided outside the pulse generator (23). The first wiring channel (31), the second wiring channel (32), and the third wiring channel (33) are connected in sequence; the first wiring channel (31) includes a first through hole (311) arranged inside the lower buffer shaft (241), one end of the first through hole (311) is connected to the instrument circuit, and the other end of the first through hole (311) is connected to the second wiring channel (32); the second wiring channel (32) includes a second through hole (321) arranged inside the circulation sleeve (2346) and a second through hole ( The sealing sleeve (322) is connected to the third wiring channel (33), and the other end of the second through hole (321) is connected to the first through hole (311); the third wiring channel (33) includes a clamping ring (331) sleeved on the housing (235) and a wiring device (332) fixedly connected to one side of the clamping ring (331); the clamping ring (331) includes an upper clamping ring and a lower clamping ring that cooperate with each other, and the upper clamping ring is connected to the end surface of the reed switch housing (221) through The lower clamping ring is fixedly connected to the end surface of the circulation sleeve (2346) by screws, and the wiring device (332) is fixedly connected to the lower clamping ring; the wiring device (332) comprises a wiring rod (3321) fixedly connected to one side of the lower clamping ring and a wiring hole (3322) provided inside the wiring rod (3321) and penetrating the wiring rod (3321) along the radial direction of the wiring rod (3321); the inner side of the wiring rod (3321) is provided with an arc surface having the same diameter as the shell (235).

2. A wireless transmission device for a cable-free logging system according to claim 1, Features: The drilling tool assembly (1) comprises an upper suspension component (11), a drill pipe protective sleeve (12), a magnetic short joint (13) and a lower suspension component (14) which are connected in sequence; the upper suspension component (11) comprises an upper suspension upper (111) and an upper suspension lower (112) which are connected in sequence; an API thread connected to a drill pipe of a well crew is provided at the upper end of the upper suspension upper (111); a positioning step (113) for axially positioning the release buffer (21) is provided on the upper suspension upper (111); and a positioning screw for installing a positioning screw is provided on the side of the upper suspension upper (111). The lower suspension assembly (14) comprises a lower suspension upper (141), a lower suspension middle (142) and a lower suspension lower (143) which are connected in sequence, the lower suspension upper (141) is connected to the magnetic short joint (13), the magnetic short joint (13) is connected to the drill pipe protective sleeve (12), a leakage hole (144) for the mud circulation channel outlet is provided on the side of the lower suspension middle (142), and a step (145) is provided on the lower suspension lower (143) to prevent the instrument from falling into the well.

3. A wireless transmission device for a wireless cable logging system according to claim 1, Features: The release buffer (21) comprises a lifting sleeve (211) connected to the drilling tool assembly, a ball (212) arranged at one end of the lifting sleeve (211), a suspension seat (213) connected to the other end of the lifting sleeve (211), a connecting shaft (214) arranged inside the suspension seat (213), a shear pin (215) arranged on one side of the connecting shaft (214), a buffer sleeve (216) connected to the other end of the connecting shaft (214), an upper buffer shaft (217) sleeved on the other end of the buffer sleeve (216), an upper buffer spring (218) arranged outside the upper buffer shaft (217), and a diverter shaft (219) arranged at the other end of the upper buffer shaft (217).

4. A wireless transmission device for a wireless cable logging system according to claim 1, Features: The lower buffer (24) comprises a lower buffer shaft (241) connected to the circulation sleeve (2346), a rubber pad (242) sequentially sleeved on the lower buffer shaft (241), a lower buffer spring (243), a suspension sleeve (244), and a sealing ring (245) arranged between the lower buffer shaft (241) and the instrument interface (25).

5. A wireless transmission device for a wireless cable logging system according to claim 1, Features: A first groove and a second groove are provided on the outer wall of the upper clamping ring, the first groove and the circulation sleeve (2346) form a first mud flow channel, and the second groove and the circulation sleeve (2346) form a second mud flow channel; a third groove and a fourth groove are provided on the outer wall of the lower clamping ring, the third groove and the circulation sleeve (2346) form a third mud flow channel, and the fourth groove and the circulation sleeve (2346) form a fourth mud flow channel; the sealing sleeve (322) is provided inside the lower clamping ring, one end of the sealing sleeve (322) is connected to the wiring hole (3322); a groove matching the step of the oblique guide sleeve (2345) is provided on the inner wall of the lower clamping ring.

6. A wireless transmission device for a wireless cable logging system according to claim 1, Features: A sealing device (4) is provided between the drilling tool assembly (1) and the release buffer pulse assembly (2), the sealing device (4) comprising a first sealing device arranged on the inner wall of the upper suspension (111), a second sealing device arranged on the inner wall of the lower suspension (142), and a third sealing device arranged on the circulation sleeve (2346), a second sealing ring (44) is provided on the outer side of the third sealing device, the first sealing device contacts the second sealing ring (44) before the instrument is released, and the second sealing device contacts the second sealing ring (44) after the instrument is released.

7. A wireless transmission device for a wireless cable logging system according to claim 6, Features: The first sealing device comprises a first boss (41), the first boss (41) comprises a first plane in contact with the second sealing ring (44) and a first inclined surface arranged on the first plane in the opposite direction of the instrument release; the second sealing device comprises a second boss (42), the second boss (42) comprises a second plane in contact with the second sealing ring (44) and a second inclined surface arranged on the second plane in the opposite direction of the instrument release; the third sealing device comprises a third boss (43) arranged on the outside of the circulation sleeve (2346) and a groove arranged on the third boss (43), the second sealing ring (44) is embedded in the groove; the third boss (43) comprises a third plane and a third inclined surface arranged on the third plane in the direction of the instrument release, and the groove is arranged on the third plane.

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