Extension tool for drilling plug of continuous pipe at long horizontal section of ultra-deep well

Abstract

The invention discloses an extension tool for a continuous pipe drilling plug of a long horizontal section of an ultra-deep well. The extension tool comprises an outer shell, an inner shell, a speed reduction structure, a pulse valve and an impeller. Liquid is guided to two sides to enter the annular flow channel. The pulse valve is installed in the inner shell, flow holes are formed in the wall of the inner shell, a spiral flow channel is formed in the valve body, and the flow holes are intermittently communicated with the spiral flow channel. One end of the deceleration structure is connected with the impeller, and the decelerated rotating speed is transmitted to the pulse valve to keep the pulse valve running continuously and generate pulse force. Vibration resistance reduction and axial pressurization can be achieved in the continuous pipe drilling plug of the long horizontal section of the ultra-deep well, and the extension capacity is jointly improved.

Description

Technical Field

[0001] The invention relates to the field of oil and natural gas drilling equipment, and in particular to an extension tool for ultra-deep well long horizontal section continuous pipe drilling plug. Background Art

[0002] Continuous pipe has been widely used in the sand plug removal and bridge plug drilling of shale gas in ultra-long horizontal sections of deep wells with a depth of more than 4,500 meters and a horizontal section of more than 1,000 meters. More than 20 bridge plugs can be removed in one drilling trip, and more than 32 plugs can be drilled in a single well, which greatly improves the operation efficiency. The well depth in Shunbei Block is more than 7,000 meters and the horizontal section is more than 1,000 meters, which puts higher requirements on the operation capacity of continuous pipe equipment. In addition, the operation under high temperature and high pressure environment brings technical challenges to downhole tools (especially power drilling tools). The adaptability of wellbore trajectory and casing specifications for long horizontal continuous pipe operations in ultra-deep wells is still unclear. Since the continuous pipe is operated under pressure in the long horizontal section of ultra-deep wells, the friction resistance of the operating fluid is large, the continuous tubing operation is very likely to buckle and lock, and the bridge plug debris is difficult to return. Therefore, it is necessary to carry out research on the supporting processes, technologies, and tools for ultra-deep well continuous tubing drilling and grinding to ensure the underground safety of ultra-deep well continuous tubing drilling and grinding operations, avoid underground complexity, and reduce well construction costs.

[0003] When drilling a coiled tubing plug, the coiled tubing is subjected to axial compression load during its extension process. When the load reaches a critical value, the straightness of the tubing string changes. Due to the effect of buckling, the contact stress between the tubing string and the well wall increases, and the friction resistance also increases, resulting in insufficient extension of the coiled tubing. Especially in the long horizontal section, it is also affected by gravity, and the trend of increasing friction resistance is more obvious. In severe cases, the drill plug may be stuck and locked. In the operation of ultra-long horizontal sections of coiled tubing, in order to improve the extension capacity of the coiled tubing, the main methods currently used are extension tools and metal drag reducers. Among the extension tools currently widely used, there are mainly crawlers, hydraulic oscillators and other tools. Crawlers are in the research stage in China and are rarely used in China. Hydraulic oscillators have been widely used in China, and they have a certain effect in reducing drag. At present, a tool is needed to reduce the friction resistance of the coiled tubing through vibration, and at the same time provide axial force to ultimately achieve the extension function. Therefore, an extension tool for ultra-deep well long horizontal section coiled tubing drilling plug is proposed, which can effectively solve the above problems. The tool can reduce the friction resistance during the extension of the coiled tubing, reduce the probability of buckling and sticking accidents, increase the dynamic drilling pressure, and improve the efficiency of the drilling plug. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an extension tool for ultra-deep well long horizontal section coiled tubing drilling plug, which can continuously extend the operating length of the coiled tubing horizontal section through hydraulic pulsation vibration and pulse axial force, realize the effective extension of the downhole tool string in the horizontal section, increase the axial force, effectively reduce friction, avoid the accident of drill plug sticking, and improve the efficiency of coiled tubing drilling plug.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] An extension tool for ultra-deep well long horizontal section continuous pipe drilling plug, comprising an outer shell body with openings at both ends and having a length, one end of the two ends being an upstream end and the other end being a downstream end, the axial direction of the outer shell body being its length direction, and also comprising an inner shell body, the axial direction of the inner shell body when connected to the outer shell body coincides with the axial direction of the outer shell body, the inner shell body comprises an insertion section and an external section arranged in sequence along the upstream and downstream directions, the insertion section is located at the free end in the chamber of the outer shell body to form a closed structure, and an annular flow channel is formed between the insertion section and the inner wall of the outer shell body, an annular sealing structure is arranged at the downstream end of the insertion section and the outer shell body, the insertion section is provided with a plurality of flow holes penetrating its side wall, a pulse valve is arranged in the chamber of the insertion section corresponding to the plurality of flow holes, the pulse valve comprises a first cylindrical section, the axial direction of the first cylindrical section coincides with the axial direction of the inner shell body and it comprises a The downstream end face of the first cylindrical section, the outer wall surface of the first cylindrical section is formed with a plurality of evenly spaced spiral flow channels, each of the spiral flow channels spirals 360 degrees, and a portion of each spiral flow channel is located inside the cylindrical section and the portion located inside extends to the downstream end face, and also includes a rotor main shaft, a through hole extending along its axial direction is opened at the center position of the first cylindrical section for the rotor main shaft to pass through, and the two are arranged to rotate relative to each other through a bearing, the rotor main shaft includes a first end located upstream and a second end located downstream, the second end is fixedly connected to an impeller and is located downstream of the pulse valve, the first end is rotatably connected to the closed free end of the inner shell, and also includes a deceleration structure installed in the chamber of the inner shell and located upstream of the pulse valve, the power input end of the deceleration structure is connected to the rotor main shaft, and the power output end is connected to the pulse valve.

[0007] Preferably, the reduction structure is a two-stage planetary gear reduction mechanism, which includes a transmission cylinder, a gear box, two planet carriers, two sun gears, two needle roller bearings, two planetary gears, and two inner gear rings. The gear box is a hollow cylindrical structure and contains a transmission cylinder, two planet carriers, two sun gears, two needle roller bearings, two planetary gears, and two inner gear rings. A planet carrier, sun gear, needle roller bearings, planetary gears and inner gear rings form a first-stage reduction structure. The inner gear ring is fixed on the inner wall of the gear box. One of the sun gears located upstream is connected to the rotor main shaft through a key, and a corresponding one of the planetary gears is connected to the planet carrier and the planetary gear is simultaneously meshed with the sun gear and the inner gear ring to form a first-stage reduction mechanism. One of the upstream planet carriers is connected to another sun gear as a first output end, and the other sun gear cooperates with the corresponding planetary gear, inner gear ring and planet carrier to form a second-stage reduction mechanism. The other planet carrier forms the power output end of the reduction structure and is connected to the pulse valve.

[0008] Preferably, it also includes an anchor assembly, the free end of the insertion section is open, the anchor assembly is combined to the open free end to form the closed structure, the anchor assembly includes a guide rod, an anchor claw, an anchor body and an anchor cover, the anchor body is cylindrical and the anchor cover is connected to the anchor body by threads, one end of the guide rod passes through the anchor cover and extends into the anchor body, and the other end is placed upstream of the anchor cover, and also includes four bonding plates, the four bonding plates are uniformly bonded to the guide rod along the circumferential direction along the outer peripheral surface of the guide rod located in the anchor body, and each bonding plate is radially outward The protrusions form four anchor claws arranged in a row along the axial direction of the guide rod, each of the anchor claws is a trapezoidal structure, a number of through holes corresponding to the anchor claws are provided on the side wall of the anchor body, a number of blind holes corresponding to the through holes are provided on the inner wall of the inner shell body, each anchor claw passes through the through hole and cooperates with the blind hole in the inner shell body, the top surface of the trapezoidal structure is embedded in the blind hole of the inner shell body, and the side surface is in conflict with the through hole on the anchor body, the outer cylindrical surface of the lower end of the anchor body located downstream is provided with a thread, which is threadedly connected with the gear box, and the open free ends of the anchor body and the inner shell body are filled with fillers to form the closed shape.

[0009] Preferably, the other end of the guide rod located upstream of the anchor cover is a conical tip.

[0010] Preferably, a circular space is left at the bottom of the anchor body, and a through hole with a diameter smaller than the circular space is opened on its bottom wall. The circular space is used to install an angular contact ball bearing, and the inner ring of the angular contact ball bearing cooperates with the first end of the rotor main shaft. The first end of the rotor main shaft is also axially positioned by a round nut.

[0011] Preferably, the impeller is connected to the rotor main shaft via a tapered pin.

[0012] Preferably, it also includes a telescopic short section, which includes a connecting body, a dynamic spring sleeve, a static spring sleeve, a spring, and a telescopic body. The connecting body includes a bottom plate and a connecting periphery formed on the bottom plate and protruding in the direction toward the inner shell body. The bottom plate is combined with the opening at the downstream end of the external section. The connecting periphery is provided with an external thread for threaded connection with the inner shell body. A circular hole penetrating through the upper and lower surfaces of the bottom plate is provided at the center position of the bottom plate for the telescopic body to pass through. The diameter of the circular hole is smaller than the diameter of the connecting periphery. The telescopic body includes a telescopic cylinder and a flaring structure connected to the telescopic cylinder and located upstream thereof. The telescopic cylinder reciprocates and telescopes in the circular hole. The dynamic spring sleeve, static spring sleeve, and spring are arranged between the connecting periphery and the telescopic body. The dynamic spring sleeve is welded on the telescopic body, and the static spring sleeve is welded on the connecting body. The spring is installed between the dynamic spring sleeve and the static spring sleeve, and the dynamic spring sleeve is located upstream of the static spring sleeve.

[0013] Preferably, the number of the flow holes is four, two of which are distributed along the axial direction of the insertion section to form a first column, and the other two are distributed along the axial direction of the insertion section to form a second column. The first column and the second column are arranged opposite to each other, and a circular flow hole is opened between the two columns.

[0014] Preferably, each flow hole is keyway shaped.

[0015] Preferably, the invention comprises three spiral flow channels, which are distributed at intervals of 120 degrees from each other.

[0016] The technical effects of the technical solution of the present invention are as follows:

[0017] The drilling fluid flows forward through the annular flow channel. When the drilling fluid flows through the connection between the outer shell and the inner shell, the straight flow channel of the fluid is cut off and the fluid gathers. At this time, the drilling fluid flows into the flow channel of the pulse valve through the flow hole on the inner shell to start the pulse valve. After the pulse valve is started, the drilling fluid forms a spiral jet in the spiral flow channel to drive the pulse valve to continue rotating. When the drilling fluid periodically enters the spiral flow channel, the drilling fluid in the pulse valve will form a periodic pulse spiral jet. If the speed of the pulse valve is too fast, hydraulic pulses will not be formed. Therefore, it is necessary to perform a certain deceleration treatment on the pulse valve to achieve a pulse jet of a certain frequency. When the pulse jet passes through the impeller, the impeller will continue to amplify the pulse jet, forming a stable pulse force in the axial direction, driving the shell to have continuous simple harmonic oscillation in the axial direction, effectively improving the friction resistance between the pipe string and the well wall, and improving the drilling efficiency.

[0018] When it is working, the upper joint is connected to the drill string, and the lower joint is connected to the drill string at the end of the drill plug. When the drilling fluid flows in from the upper joint, the drilling fluid will first impact on the conical tip of the guide rod. At this time, the drilling fluid will be split by the guide rod, and the fluid will continue to flow forward along the wall of the outer shell through the opened annular flow channel. When the drilling fluid flows through the connection between the outer shell and the inner shell, the straight flow channel of the fluid is cut off and the fluid gathers; at this time, the drilling fluid flows into the flow channel of the pulse valve through the keyway-shaped flow hole on the inner shell. If the flow hole and the spiral flow channel are not connected under the initial condition, a small amount of drilling fluid will pass through the circular flow hole to provide initial torque for starting the pulse valve; After the pulse valve is started, the drilling fluid forms a spiral jet in the spiral flow channel to drive the pulse valve to continue rotating. When the drilling fluid periodically enters the spiral flow channel, the drilling fluid in the pulse valve will form a periodic pulse spiral jet. If the rotation speed of the pulse valve is too fast, hydraulic pulses will not be formed. Therefore, the pulse valve needs to be decelerated to form a pulse jet of a certain frequency. When the pulse jet passes through the impeller, the impeller will continue to amplify the pulse jet, forming a stable pulse force in the axial direction, driving the shell to produce continuous simple harmonic oscillation in the axial direction, effectively improving the friction resistance between the pipe string and the well wall, and improving the drilling efficiency.

[0019] The design of the conical guide rod is adopted, which can not only guide the drilling fluid to the annular flow channel, but also prevent the drilling fluid from directly eroding the anchor cover.

[0020] The inner shell is fixed in the form of anchors, and is fixed with 4 anchor claw bodies and a total of 16 anchor claw openings, with a simple structure and reliable connection.

[0021] The pulse valve is used as the power element to generate pulses. The pulse valve is driven by drilling fluid, which avoids the problem of poor high temperature resistance caused by screw motor drive and saves energy.

[0022] The structure in which the flow hole and the spiral flow channel are periodically connected is adopted, and the eccentric moving plate valve with a planar structure is not adopted, thus avoiding the problem of serious erosion and wear of the previous plate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of an extension tool for ultra-deep well long horizontal section continuous tubing drilling plug provided by the present invention.

[0024] Figure 2 The schematic diagram is to divide the overall structure of the extension tool for ultra-deep well long horizontal section continuous tubing drilling plug of the present invention into three areas, namely area I, area II and area III.

[0025] Figure 3 This is a schematic diagram of the structure of area I.

[0026] Figure 4 This is a schematic diagram of the structure of region II.

[0027] Figure 5 This is a schematic diagram of the structure of region III.

[0028] Figure 6 It is a structural schematic diagram of the telescopic short section.

[0029] Figure 7 Schematic diagram of the three-dimensional structure of the pulse valve.

[0030] Figure 8 It is a schematic cross-sectional view of the downstream end face of the pulse valve.

[0031] Fig. 9 Schematic diagram of the three-dimensional structure of the anchor assembly.

[0032] Fig.10 Schematic diagram of the three-dimensional structure of the inner shell.

[0033] in, Figure 1-10 middle:

[0034] Outer shell 1, guide rod 2, anchor cover 3, anchor body 4, anchor claw 5, round nut 6, angular contact ball bearing I7, flat key 8, transmission cylinder 9, gear box 10, felt ring 11, pulse valve 12, impeller 13, O-ring 14, inner shell 15, tapered pin 16, rotor main shaft 17, sleeve 18, shaft elastic retaining ring 19, angular contact ball bearing II 20, planet carrier 21, sun gear 22, needle bearing 23, planetary gear 24, inner gear ring 25, packing 26, upper joint 27, lower joint 28, telescopic body 29, static spring sleeve 30, spring 31, dynamic spring sleeve 32, connector 33, O-ring 34, annular flow channel 35, flow hole 36, spiral flow channel 37, downstream end face 38. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below.

[0036] The present invention will be described in more detail below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein and still achieve the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation of the present invention.

[0037] For the sake of clarity, not all features of the actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would obscure the present invention with unnecessary details. It should be recognized that in the development of any actual embodiment, a large number of implementation details must be made to achieve the specific goals of the developer.

[0038] In order to make the purpose and features of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise ratios, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] Combination Figure 1-10 , the extension tool for ultra-deep well long horizontal section coiled tubing plug drilling shown includes:

[0040] Outer shell 1 and inner shell 15; outer shell 1 is provided with upper joint 27, and API standard threaded interface is processed on upper joint 27 for connecting with drill pipe. The part of inner shell 15 in contact with upper shell 1 is provided with O-ring 14, and connected by thread. Since the inner diameter of upper outer shell 1 is not equal to the outer diameter of inner shell 15, an annular flow channel 35 is formed between them (as shown in area II in the figure); threads are processed inside the lower shell of inner shell 15, where threads are connected with connector 33, and 4 keyway-type flow holes are opened in the part of inner shell 15 in contact with pulse valve 12, such as Figure 5 Flow channel I and flow channel II in region III or more intuitively can be obtained from Figure 7 The thinnest wall of the inner shell 15 is provided with equally spaced trapezoidal blind holes, which are designed to fully cooperate with the trapezoidal claw surface of the fluke 5, and the ultimate goal is to fix the inner shell 15 axially and circumferentially.

[0041] Anchor assembly: It includes a guide rod 2, an anchor cover 3, an anchor body 4, and an anchor claw 5; the guide rod 2 is a key component for introducing the fluid into the annular flow channel 35, and the conical tip of the guide rod 2 passes through the anchor cover 3 and points to the center of the circular ring of the upper joint; the large diameter body of the guide rod 2 is connected to the lower end arc surface of the anchor claw 4, and the arc surface of the anchor claw 4 has the same curvature as the arc of the large diameter of the guide rod 2. The anchor body 4 is provided with rectangular through holes around it, and the anchor claw 5 passes through the through holes and cooperates with the blind holes in the inner shell 15; the inner cylindrical surface of the upper end of the anchor body 4 is processed with an internal thread, which is used to form a threaded connection with the anchor cover 3; the outer cylindrical surface of the lower end of the anchor body 4 is also processed with a thread, which is used to form a threaded connection with the gear box 10 and also can play a role in axial positioning of the gear box 10; the lower end shell of the anchor body 4 has two coaxial holes, one is a large-diameter blind hole for cooperating with the angular contact ball bearing, and the other is a small-diameter through hole for the rotor main shaft 17 to pass through, and a sealing groove is opened on the inner wall of the through hole for sealing; a filler 26 is used to seal between the anchor body 4 and the inner shell 15. The design of the anchor claw 5 is very ingenious. The anchor claw 5 is designed to be a trapezoidal structure, with the top surface embedded in the lower shell 15 and the side surface in contact with the anchor body 4. In addition, each ultra-deep well long horizontal section continuous tubing drilling plug extension tool only needs to be equipped with one set of anchor claws, and one set is composed of 4 anchor claws 5. Each anchor claw 5 is composed of 4 trapezoidal sub-claws, and each sub-claw can form a restraining force independently, which can not only fix the lower shell 15, but also fix the anchor assembly.

[0042] The reduction structure includes a transmission cylinder 9 , a gear box 10 , a planet carrier 21 , a sun gear 22 , a needle bearing 23 , a planet gear 24 , and an inner gear ring 25 . The gearbox 10 is a hollow cylindrical structure. The inner surface of the cylinder on the gearbox 10 is processed with threads. An inner ring gear 25 is fixed on the inner wall of the gearbox 10. The inner ring gear 25 is a fixed part in the planetary gear system. Four planetary gears 24 are directly meshed with the inner ring gear 25. The sun gear 22 is meshed with the planetary gear 24. The rotational torque of the sun gear 22 comes from the flat key 8 that cooperates with the rotor main shaft 17 and transmits torque. After deceleration, the torque output from the planetary gear 24 is transmitted to the planetary carrier 21. The planetary carrier 21 and the planetary gear 24 are connected by a needle bearing 23. The torque of the planetary carrier 21 is transmitted through the transmission cylinder 9, and finally the torque is output to the pulse valve 12. The above process realizes a two-stage planetary gear deceleration, the purpose of which is to enable the pulse valve 12 to obtain a stable pulse jet with a moderate frequency, so as to realize the axial mechanical vibration of the drill plug and reduce the friction between the continuous pipe string and the well wall. Provide a power source.

[0043] It also includes round nut 6, angular contact ball bearing Ⅰ7, felt ring 11, pulse valve 12, impeller 13, tapered pin 16, rotor main shaft 17, sleeve 18, shaft elastic retaining ring 19, angular contact ball bearing Ⅱ 20; the pulse valve 12 is the main component of the pulse valve group, and the functions of other components are to serve the pulse valve. As mentioned above, the torque of the pulse valve 12 before the speed is reduced is transmitted by the transmission tube 9 as a transition element. An angular contact ball bearing II 20 is installed between the transmission tube 9 and the gear box 10, the purpose of which is to enable the rotation of the transmission tube 9; the transmission tube 9 and the pulse valve 12 are connected by threads and are sealed with an O-ring; in order to enable the pulse valve 12 to rotate smoothly, an angular contact ball bearing is installed between the inner tube wall of the pulse valve 12 and the rotor main shaft 17, and the bearing is axially positioned by a shaft sleeve 18 and an elastic retaining ring 19, and a sealing ring is provided between the inner wall of the pulse valve 12 body and the rotor main shaft 17; the upper end of the rotor main shaft 17, that is, the end, is connected to the large-diameter blind hole at the bottom of the anchor body 4 through an angular contact ball bearing I 7, and in order to form a reliable connection with the rotor main shaft 17, it is axially positioned by a round nut 6 at its end; the other end of the rotor main shaft 17 is connected to the impeller rotor 13 through a cylindrical pin 16, so that the impeller rotor 13 can be axially positioned while maintaining stable operation in the circumferential direction.

[0044] The telescopic short section includes a telescopic body 29, a static spring sleeve 30, a spring 31, a dynamic spring sleeve 32, a connecting body 33, and an O-ring 34; the telescopic body 29 is used to receive pulse force and form a periodic axial displacement, the telescopic body 29 is welded with a dynamic spring sleeve 32 and has an O-ring 34, and the lower end of the telescopic body is provided with an external thread for connecting with the lower joint 28; the connecting body 33 is welded with a static spring sleeve 30 and has an O-ring 34, and the upper end of the connecting body is provided with an external thread for connecting with the inner shell 15; the spring 31 is installed between the two spring sleeves, and the spring is a key component that can realize the periodic axial displacement of the drilling plug.

[0045] Part of each spiral flow channel 37 is located inside the cylindrical segment, and the part located inside extends to the downstream end surface 38 .

[0046] The principle of pulse force formation: The pulse valve 12 can only rotate when it receives drilling fluid that passes through the annular flow channel, the flow hole and then the spiral flow channel. The spiral flow channel in the pulse valve 12 makes the drilling fluid flow out of the valve body in a spiral shape, and because the spiral flow channel is periodically connected to the flow hole of the lower shell, that is, the fluid in the spiral flow channel is sometimes there and sometimes not, so that the fluid in the pipe string will form a pulsation phenomenon. The pulsating fluid continues to flow forward under the action of the impeller. The continuous pulsation will cause a certain axial force on the pipe wall and cause the drill plug to obtain axial vibration displacement. This axial vibration can effectively reduce the friction between the pipe string and the pipe wall and improve the efficiency of the drill plug.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention, so the above is only an embodiment of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention also includes various equivalent changes and improvements, which will fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An extension tool for ultra-deep well long horizontal section coiled tubing plug drilling, characterized in that: The invention comprises an outer shell body with openings at both ends and having a length, wherein one end is an upstream end and the other end is a downstream end, and the axial direction of the outer shell body is its length direction, and also comprises an inner shell body, wherein when the inner shell body is connected to the outer shell body, its axial direction coincides with the axial direction of the outer shell body, and the inner shell body comprises an insertion section and an external section which are sequentially arranged along the upstream and downstream directions, wherein the insertion section is located at the free end in the cavity of the outer shell body to form a closed structure, and an annular flow channel is formed between the insertion section and the inner wall of the outer shell body, an annular sealing structure is arranged at the downstream end of the insertion section and the outer shell body, the insertion section is provided with a plurality of flow holes penetrating through its side wall, and a pulse valve is arranged in the cavity of the insertion section corresponding to the plurality of flow holes, and the pulse valve comprises a first cylindrical section, wherein the axial direction of the first cylindrical section coincides with the axial direction of the inner shell body and it comprises a downstream end face located downstream, and the first The outer wall of the cylindrical section is formed with a number of evenly spaced spiral flow channels, each of which spirals 360 degrees, and a portion of each spiral flow channel is located inside the cylindrical section and the portion located inside extends to the downstream end face. It also includes a rotor main shaft, and a through hole extending along its axial direction is opened at the center position of the first cylindrical section for the rotor main shaft to pass through, and the two are arranged to rotate relative to each other through a bearing. The rotor main shaft includes a first end located upstream and a second end located downstream, the second end is fixedly connected to an impeller and is located downstream of the pulse valve, the first end is rotatably connected to the closed free end of the inner shell, and also includes a deceleration structure installed in the chamber of the inner shell and located upstream of the pulse valve, the power input end of the deceleration structure is connected to the rotor main shaft, and the power output end is connected to the pulse valve.

2. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 1 is characterized in that: The reduction structure is a two-stage planetary gear reduction mechanism, which includes a transmission cylinder, a gear box, two planet carriers, two sun gears, two needle roller bearings, two planetary gears, and two inner gear rings. The gear box is a hollow cylindrical structure and is equipped with a transmission cylinder, two planet carriers, two sun gears, two needle roller bearings, two planetary gears, and two inner gear rings. A planet carrier, sun gear, needle roller bearings, planetary gears and inner gear rings form a first-stage reduction structure. The inner gear ring is fixed on the inner wall of the gear box. One of the sun gears located upstream is connected to the rotor main shaft through a key, and a corresponding one of the planetary gears is connected to the planet carrier and the planetary gear is meshed with the sun gear and the inner gear ring at the same time to form a first-stage reduction mechanism. One of the planet carriers upstream is connected to another sun gear as a first output end, and the other sun gear cooperates with the corresponding planetary gear, inner gear ring and planet carrier to form a second-stage reduction mechanism. The other planet carrier forms the power output end of the reduction structure and is connected to the pulse valve.

3. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 2 is characterized in that: It also includes an anchor assembly, wherein the free end of the insertion section is open, and the anchor assembly is combined with the open free end to form the closed structure. The anchor assembly includes a guide rod, an anchor claw, an anchor body and an anchor cover, wherein the anchor body is cylindrical and the anchor cover is connected to the anchor body by threads, one end of the guide rod passes through the anchor cover and extends into the anchor body, and the other end is placed upstream of the anchor cover, and also includes four bonding plates, which are uniformly bonded to the guide rod along the circumferential direction along the outer peripheral surface of the guide rod located in the anchor body, and each bonding plate protrudes radially outward. Four anchor claws are formed and arranged in a row along the axial direction of the guide rod, each of the anchor claws is a trapezoidal structure, a number of through holes corresponding to the anchor claws are provided on the side wall of the anchor body, a number of blind holes corresponding to the through holes are provided on the inner wall of the inner shell body, each anchor claw passes through the through hole and cooperates with the blind hole in the inner shell body, the top surface of the trapezoidal structure is embedded in the blind hole of the inner shell body, and the side surface is in conflict with the through hole on the anchor body, the outer cylindrical surface of the lower end of the anchor body located downstream is provided with a thread, which is threadedly connected with the gear box, and the open free ends of the anchor body and the inner shell body are filled with fillers to form the closed shape.

4. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 3 is characterized in that: The other end of the guide rod located upstream of the anchor cover is a tapered tip.

5. The extension tool for ultra-deep well long horizontal section coiled tubing plug drilling according to claim 3 is characterized in that: A circular space is reserved at the bottom of the anchor body, and a through hole with a diameter smaller than the circular space is opened on its bottom wall. The circular space is used to install an angular contact ball bearing, and the inner ring of the angular contact ball bearing cooperates with the first end of the rotor main shaft. The first end of the rotor main shaft is also axially positioned by a round nut.

6. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 3 is characterized in that: The impeller is connected to the rotor main shaft via a tapered pin.

7. The extension tool for ultra-deep well long horizontal section coiled tubing plug drilling according to claim 3 is characterized in that: The telescopic short section is also included, which includes a connecting body, a dynamic spring sleeve, a static spring sleeve, a spring, and a telescopic body. The connecting body includes a bottom plate and a connecting periphery formed on the bottom plate and protruding in the direction toward the inner shell body. The bottom plate is combined with the opening at the downstream end of the external section. The connecting periphery is provided with an external thread for threaded connection with the inner shell body. A circular hole penetrating through the upper and lower surfaces of the bottom plate is provided at the center position of the bottom plate for the telescopic body to pass through. The diameter of the circular hole is smaller than the diameter of the connecting periphery. The telescopic body includes a telescopic cylinder and a flaring structure connected to the telescopic cylinder and located upstream thereof. The telescopic cylinder reciprocates and telescopes in the circular hole. The dynamic spring sleeve, static spring sleeve, and spring are arranged between the connecting periphery and the telescopic body. The dynamic spring sleeve is welded on the telescopic body, and the static spring sleeve is welded on the connecting body. The spring is installed between the dynamic spring sleeve and the static spring sleeve, and the dynamic spring sleeve is located upstream of the static spring sleeve.

8. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 1 is characterized in that: There are four flow holes, two of which are distributed along the axial direction of the insertion section to form a first column, and the other two are distributed along the axial direction of the insertion section to form a second column. The first column and the second column are arranged opposite to each other, and a circular flow hole is provided between the two columns.

9. The ultra-deep well long horizontal section coiled tubing plug extension tool according to claim 8, characterized in that: Each flow hole is keyway shaped.

10. The extension tool for ultra-deep well long horizontal section coiled tubing plug drilling according to claim 1, characterized in that: It comprises three spiral flow channels, which are distributed at intervals of 120 degrees from each other.

Images