Extended reach downhole casing and cementing assembly tool

Abstract

This invention relates to a combined tool for extended reach casing and cementing. A float collar, a bypass valve, and an oscillating device are sequentially screwed onto the top of the power guide shoe. The oscillating device's oscillating shaft, from top to bottom, comprises an upper connector, a hexagonal tenon, a polished rod section, and a threaded section. A spring sleeve is screwed onto the upper part of the threaded section of the oscillating shaft. Disc springs are stacked above the spring sleeves, each disc spring fitting around the outer circumference of the polished rod section. A spring plug is pressed above the disc springs, and a hexagonal hole is provided along the axis of the spring plug, fitting onto the hexagonal tenon. A spring cylinder is screwed onto the lower outer circumference of the spring plug. The inner cavity of the spring cylinder has an inner step, located below the threaded section and spaced at intervals. An oscillator is installed below the inner step, its bottom abutting against the top of the lower connector. The upper external thread of the oscillating lower connector is screwed into the lower port of the spring cylinder. This tool can generate self-excited vibration, reducing friction, increasing casing running speed, and improving cement stone strength and cementing quality.

Description

Technical Field

[0001] This invention relates to a cementing tool, and more particularly to a downhole casing and cementing assembly tool with extended reach, belonging to the technical field of downhole tools for oil and gas. Background Technology

[0002] With the development of unconventional oil and gas fields and offshore-onshore oil and gas fields, complex well structures are becoming increasingly common. When the well depth / vertical depth ratio is ≥2, it is called a long-reach well. The frictional resistance of the casing in long-reach wells may exceed the weight of the tubing in the vertical section of the well, making casing installation difficult. To address this issue, various technologies and methods have been researched and developed to ensure the casing is successfully installed to the intended position in such long-reach wells.

[0003] Traditional guide shoes play a very limited role in casing installation because they are fixed in place and their outer diameter is the same as the casing's outer diameter. This results in very high friction during casing installation, which is not conducive to installing casing in high-friction wells.

[0004] The main methods for solving high friction and pressure issues in downhole drilling, both domestically and internationally, are the use of hydraulic vibratory tools. These tools generate vibration along the drill string axis through hydraulic action, converting static friction into dynamic friction, reducing friction during drilling, improving pressure transmission, and ultimately increasing the rate of penetration (ROP). Existing vibratory tools primarily achieve vibration through the coordination of mechanical components, making them prone to wear or damage. They can only use drilling fluid as a medium and cannot be used to transfer cement slurry. They also lack the ability to improve the bonding strength between the cement sheath and the tubing / wellbore interface, thus failing to enhance cement stone strength and cementing quality.

[0005] In techniques and methods that involve connecting auxiliary casing-running tools or auxiliary cementing tools in series within the casing string, a situation can arise where, after the casing string is lowered to the predetermined position, these auxiliary tools are prone to blockage during the cementing period, preventing cement from continuing to circulate downwards and forcing the cementing operation to terminate. Therefore, for high-friction wellbore casing-running technology, a bypass tool is needed, connected in series before the auxiliary casing-running tools. When the auxiliary tools become blocked, the bypass tool opens the flow path between the casing and the annulus, shielding the auxiliary tools and allowing cement to continue circulating through the bypass tool, thus completing the cementing operation.

[0006] Chinese invention patent CN 202220572U discloses a "bypass sub capable of multiple activation cycles," comprising a body and upper and lower connectors forming an outer body with a cavity. The upper part of the body has at least two nozzles radially arranged. A sliding sleeve, forming a sliding seal with the body, is located inside the body. A radial through-hole corresponding to the nozzle is located on the upper part of the sliding sleeve, and a ball seat is located below the through-hole. An axial stroke groove is formed on the lower part of the sliding sleeve, and a spring is fitted onto its exterior. A locating pin is provided on the body, forming a downward limiting fit with the stroke groove on the lower part of the sliding sleeve. The downward stop position of the sliding sleeve is the position where the through-hole of the sliding sleeve connects with the nozzle of the body. A ball basket is located in the cavity below the sliding sleeve. This bypass sub has a complex structure, is long, and has high processing requirements and manufacturing costs. In particular, it requires ball injection and pressure buildup to open the bypass channel, which cannot be done during cementing and grouting processes. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems existing in the prior art and provide a combined tool for downhole casing and cementing with large displacement, which can generate self-excited vibration during the casing running process, reduce the friction during the casing running process, increase the casing running speed, and improve the cement stone strength and cementing quality.

[0008] To solve the above technical problems, this invention provides a large-displacement downhole casing and cementing assembly tool, including a power guide shoe located at the bottom of the casing string. A float collar is screwed onto the top of the power guide shoe, a bypass valve is screwed onto the top of the float collar, and an oscillating device is screwed onto the top of the bypass valve. The upper end of the oscillating device is connected to the casing. The oscillating device includes an oscillating shaft, which, from top to bottom, has an upper oscillating shaft connector, a hexagonal tenon, a smooth shaft section, and a threaded shaft section. A through-hole is provided along the axis of the oscillating shaft. A spring threaded sleeve is screwed onto the upper part of the threaded shaft section, and a [missing information - likely a component or material] is stacked above the spring threaded sleeve. Multiple disc springs are fitted around the outer periphery of the oscillating shaft's smooth rod section. A spring plug is pressed above the top disc spring, and a hexagonal hole is provided along the axis of the spring plug. The hexagonal hole fits onto the hexagonal tenon of the oscillating shaft and matches each other. A downwardly extending spring cylinder is screwed onto the lower outer periphery of the spring plug. The inner cavity of the spring cylinder has an internal step, which is located below the threaded section of the oscillating shaft and spaced at a distance. An oscillator is installed below the internal step of the spring cylinder, and the bottom of the oscillator abuts against the top of the lower oscillating connector. The upper external thread of the lower oscillating connector is screwed into the lower port of the spring cylinder.

[0009] As an improvement of the present invention, an upper safety sleeve is provided below the spring sleeve, the upper safety sleeve is screwed onto the threaded section of the oscillating shaft, and an upper wear-resistant ring is embedded in the outer peripheral groove of the upper safety sleeve, the outer wall of the upper wear-resistant ring abutting against the inner wall of the spring cylinder; a lower safety sleeve is provided below the upper safety sleeve, the lower safety sleeve is screwed onto the threaded section of the oscillating shaft, a lower wear-resistant ring is embedded in the outer peripheral groove of the lower safety sleeve, the outer wall of the lower wear-resistant ring abutting against the inner wall of the spring cylinder, and a reduced diameter section is provided at the lower end of the lower safety sleeve, the outer diameter of the reduced diameter section being smaller than the inner diameter of the inner step of the spring cylinder.

[0010] As a further improvement of the present invention, the upper end center of the oscillator is provided with an axial inlet hole extending downward along the axis, and the lower end center of the oscillator is provided with an axial outlet hole extending upward along the axis; three oscillation grooves are evenly distributed on the outer periphery of the middle section of the oscillator, and the upper part of each oscillation groove is provided with a jet inlet radial hole, the inner port of each jet inlet radial hole communicating with the axial inlet hole of the oscillator; the lower part of each oscillation groove is provided with a jet outlet radial hole, the inner port of each jet outlet radial hole communicating with the axial outlet hole of the oscillator; the outer periphery of the oscillator is wrapped with a sealing alloy sleeve.

[0011] As a further improvement of the present invention, a jet channel extending axially downward is provided directly below the outer port of the jet inlet radial hole. The lower end of the jet channel is connected to a gradually expanding channel that is narrower at the top and wider at the bottom. A flow divider block is provided at the center of the lower flared mouth of the gradually expanding channel. The top of the flow divider block is provided with a concave arc. Symmetrical deflection channels are formed between the two sides of the flow divider block and the sidewalls of the gradually expanding channel. The lower port of the gradually expanding channel communicates with the vortex reversing chamber. The outer port of the jet outlet radial hole is located at the center of the vortex reversing chamber. The lower part of the vortex reversing chamber is provided with an annular channel coaxial with the jet outlet radial hole.

[0012] As a further improvement of the present invention, the upper part of the oscillating groove is provided with a semi-circular annular flow channel, the semi-circular annular flow channel is coaxial with the radial hole of the jet inlet, and the throat of the jet flow channel and the gradually expanding flow channel are symmetrically connected with arc-shaped flow channels that bend to both sides and upward. The two ends of the semi-circular annular flow channel are connected to the outer ports of the corresponding arc-shaped flow channels through connecting flow channels respectively; the lower ends of the two connecting flow channels are also respectively connected to downward extending reversing flow channels, and the lower ends of the two reversing flow channels approach each other and are respectively connected to the upper parts of both sides of the vortex reversing chamber.

[0013] As a further improvement of the present invention, the bypass valve includes a bypass valve housing, a housing bypass section in the middle section of the bypass valve housing, a plurality of housing bypass holes evenly distributed in the lower middle part of the housing bypass section, an inner boss in the housing above the housing bypass section, and an inner ring in the housing above the inner boss, the diameter of the inner ring being smaller than the diameter of the inner boss; a sliding sleeve is provided in the central hole of the bypass valve housing, the sliding sleeve having a large diameter section and a small diameter section from top to bottom, the top of the large diameter section abutting against the lower part of the inner ring, and the outer periphery of the large diameter section sealingly against the inner wall of the inner boss; a larger diameter section is provided below the housing bypass section. The lower female thread section of the housing is screwed into the middle external thread of the lower connector of the bypass valve. Above the middle external thread of the lower connector is a reduced-diameter smooth rod section of the lower connector, and above the smooth rod section of the lower connector is a reduced-diameter and upward-extending guide sleeve of the lower connector. The lower end of the small-diameter section of the sliding sleeve is inserted into the inner cavity of the guide sleeve of the lower connector and they are sealed to each other. Below the small-diameter section of the sliding sleeve is a control cam, and the lower part of the control cam is supported by a spring on the inner step of the lower connector of the bypass valve. The outer peripheral wall of the control cam is symmetrically provided with cam control grooves, and cam pins are symmetrically screwed into the circumference of the smooth rod section of the lower connector, and the inner ends of the cam pins are respectively embedded in the cam control grooves.

[0014] As a further improvement of the present invention, the cam control slot includes multiple sets of alternating, downward-opening long cam slots and short cam slots. When the control cam floats, the cam pins alternately engage with the long cam slots and short cam slots. Each long cam slot extends axially upward to the upper part of the control cam, and each long cam slot and short cam slot has an upward-opening transition slot below it. Each long cam slot, short cam slot, and transition slot has an inlet inclined surface at its inlet and an outlet vertical wall at its outlet. The inlet inclined surface of each transition slot is located below the outlet vertical wall of the long cam slot, and the outlet vertical wall of each transition slot is located below the inlet inclined surface of the short cam slot.

[0015] As a further improvement of the present invention, the power guide shoe includes a tool upper connector, the lower end of which is screwed with a bearing clamping connector, the lower end of which is screwed with a turbine housing, the lower end of which is screwed with a centralizer connector, and the lower end of which is screwed with a centralizer; the inner cavity of the bearing clamping connector is provided with an upper connecting shaft, the upper part of which is supported by a bearing on the inner wall of the bearing clamping connector; the inner cavity of the turbine housing is provided with a turbine device, which is fixed to the outer periphery of the spindle, and the upper end of the spindle is connected to the... The lower end of the upper connecting shaft is screwed together, and the lower end of the spindle is screwed together with the upper end of the lower connecting shaft. The middle section of the lower connecting shaft is supported by a bearing on the inner wall of the stabilizer. An eccentric guide shoe is screwed onto the lower end of the lower connecting shaft. The bottom of the center hole of the upper connecting shaft communicates with the upper space of the turbine device through evenly distributed upper connecting shaft bypass holes. The upper part of the center hole of the lower connecting shaft communicates with the lower space of the turbine device through evenly distributed lower connecting shaft bypass holes. The lower end of the center hole of the lower connecting shaft communicates with the eccentric water eye of the eccentric guide shoe through the center hole of the eccentric guide shoe.

[0016] As a further improvement of the present invention, the turbine device includes multiple sets of turbine stators and turbine rotors. Each turbine stator is stacked and fixed to the inner wall of the turbine housing, and each turbine rotor is stacked and fixed to the outer periphery of the mandrel. The turbine rotors and turbine stators are paired one-to-one. The lower port of the bearing clamping joint presses against the top turbine stator, and the upper port of the stabilizer joint abuts against the bottom turbine stator. The upper port of the top turbine rotor abuts against the shoulder of the upper connecting shaft, and the lower port of the bottom turbine rotor abuts against the shoulder of the lower connecting shaft through a washer.

[0017] As a further improvement of the present invention, the upper part of the inner cavity of the stabilizer is provided with an inner step, an upper thrust bearing is provided above the inner step, an upper threaded sleeve is pressed above the upper thrust bearing, and the upper threaded sleeve is screwed onto the upper middle threaded section of the lower connecting shaft; a lower thrust bearing is provided below the inner step, a lower threaded sleeve is pressed below the lower thrust bearing, and the lower threaded sleeve is screwed onto the middle threaded section of the lower connecting shaft; a lower deep groove ball bearing is provided below the lower threaded sleeve, and the bottom of the lower deep groove ball bearing abuts against the boss of the lower connecting shaft; a spacer is supported between the lower inner edge of the upper threaded sleeve and the upper inner edge of the lower threaded sleeve, and the upper thrust bearing and the lower thrust bearing are fitted onto the outer periphery of the spacer.

[0018] Compared with existing technologies, this invention achieves the following beneficial effects: 1. The oscillation device has a simple structure, low pressure loss, and low cost; during casing installation, drilling fluid is used as the medium, and pressure pulsation is generated through its own flow channels to achieve vibration, transforming the static friction of the tubing string in the wellbore into dynamic friction; during the casing installation stage, it can effectively remove wellbore micro-steps, sand bridges, diameter reductions, and spalling, significantly reducing wellbore friction and improving the safe installation capability of high-friction wellbore casing. After the casing is in place, the oscillating pressure wave generated during cement slurry injection can effectively improve the cement slurry displacement efficiency, improve the bonding strength between the cement sheath and the interface between the tubing string and the wellbore, and improve the cement stone strength and cementing quality.

[0019] 2. The pressure difference created by the area difference between the upper and lower ends of the sliding sleeve provides the sliding sleeve with the power to slide down. The height of the cam is controlled by a cam pin, thus controlling the sliding sleeve's position (high or low). When the sliding sleeve is in the high position, the bypass channel is sealed, and the drilling fluid flows down along the central hole. At this time, the power guide shoe can be driven to rotate, facilitating wellbore location. When the sliding sleeve is in the low position, the bypass channel is opened, and the drilling fluid enters the casing annulus through the bypass holes in the casing. At this time, the power guide shoe does not rotate and flows down. The sliding sleeve can switch positions without needing to drop a ball, allowing for repeated switching countless times. After the casing is in place, backwashing can be performed through the bypass channel to clean the mud cake from the well wall, facilitating the next step of cementing and cementing.

[0020] 3. The power guide shoe uses multiple sets of turbine devices stacked in series, which greatly improves the rotational power. During the cementing string running downhole, when encountering large wellbore step resistance, the eccentric rotational guide mechanism of the shoe cap, together with the centralizer, can achieve automatic centering. Through the contact and compression between the eccentric large displacement downhole casing and cementing combination tools and the wellbore, the automatic rotation angle can be achieved to find the wellbore direction, thereby ensuring that the casing string is safely run into the predetermined position, which can create good preconditions for subsequent operations. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the tube string of the present invention;

[0022] Figure 2 This is a cross-sectional view of the oscillation device in this invention;

[0023] Figure 3 This is an exploded view of the oscillation device in this invention;

[0024] Figure 4 yes Figure 2 Front view of the oscillation axis;

[0025] Figure 5 yes Figure 2 Front view of the oscillator;

[0026] Figure 6yes Figure 5 Sectional view along the middle AA;

[0027] Figure 7 yes Figure 5 A three-dimensional image;

[0028] Figure 8 This is a front view of the bypass valve in this invention;

[0029] Figure 9 This is a three-dimensional exploded view of the bypass valve in this invention;

[0030] Figure 10 This is a front view of the power-driven shoe in this invention;

[0031] Figure 11 for Figure 10 Enlarged view of the upper middle section;

[0032] Figure 12 for Figure 10 Enlarged view of the lower middle section;

[0033] Figure 13 for Figure 10 A 3D view of the lower connecting shaft;

[0034] Figure 14 for Figure 10 A 3D diagram of an off-center shoe.

[0035] In the diagram: A. Oscillating device; 1. Oscillating shaft; 1a. Upper connector of oscillating shaft; 1b. Hexagonal tenon of oscillating shaft; 1c. Smooth section of oscillating shaft; 1d. Threaded section of oscillating shaft; 1e. Sealing section of oscillating shaft; 1f. Sealing groove of oscillating shaft; 1g. Sealing ring of oscillating shaft; 2. Spring plug; 2a. Hexagonal hole; 3. Spring cylinder; 3a. Step inside the spring cylinder; 3b. Bypass hole of the spring cylinder; 4. Spring washer; 5. Disc spring; 6. Spring threaded sleeve; 7. Upper safety retainer; 7a. Upper wear ring; 8. Lower safety retainer; 8a. Lower wear ring; 8b. Step seal; 9. Oscillator; 9a. Oscillator 9b. Axial inlet hole; 9c. Jet inlet radial hole; 9d. Jet channel; 9e. Diverging channel; 9f1. Deflection channel one; 9f2. Deflection channel two; 9g. Swirl reversing chamber; 9h. Annular channel; 9i1. Reversing channel one; 9i2. Reversing channel two; 9j1. Connecting channel one; 9j2. Connecting channel two; 9k1. Arc-shaped channel one; 9k2. Arc-shaped channel two; 9m. Semi-circular annular channel; 9n. Jet outlet radial hole; 9p. Oscillator axial outlet hole; 9q. Sealing alloy sleeve; 10. Oscillator lower connector; 10a. Oscillator lower connector sealing ring.

[0036] B. Bypass valve; 11. Bypass valve housing; 11a. Upper female thread section of housing; 11b. Inner convex ring of housing; 11c. Inner boss of housing; 11d. Guide cone surface; 11e. Bypass section of housing; 11f. Bypass hole of housing; 11g. Lower female thread section of housing; 12. Sliding sleeve; 12a. Large diameter section of sliding sleeve; 12b. Small diameter section of sliding sleeve; 13. Control cam; 13a. Cam control countersunk groove; 13a1. Cam long groove; 1 3a2. Cam short groove; 13a3. Transition groove; 14. Cam pin; 15. Spring; 16a. Upper spring seat; 16b. Lower spring seat; 17. Lower bypass valve connector; 17a. Lower connector guide sleeve; 17b. Lower connector smooth rod section; 17c. Lower connector pin hole; 17d. Lower connector middle external thread; 17e. Lower connector lower external thread; 18. Sliding sleeve Glyd ring; 19. Sliding sleeve O-ring; 20. Combined sealing ring.

[0037] C. Floating hoop;

[0038] D. Power guide shoe; 21. Tool upper connector; 22. Bearing clamping connector; 23. Upper deep groove ball bearing; 24. Upper connecting shaft; 24a. Upper connecting shaft center hole; 24b. Upper connecting shaft bypass hole; 25. Turbine housing; 26. Mandrel; 27. Turbine assembly; 27a. Turbine stator; 27b. Turbine rotor; 28. Lower connecting shaft; 28a. Upper threaded section of lower connecting shaft; 28b. Lower connecting shaft bypass hole; 28c. Upper threaded section of lower connecting shaft; 28d. Lower connecting shaft middle... 28e. Lower connecting shaft boss; 28f. Lower connecting shaft center hole; 29. ​​Washer; 30. Centralizer connector; 31. Centralizer; 31a. Centralizer inner step; 32. Upper threaded sleeve; 33. Upper thrust bearing; 34. Spacer; 35. Lower thrust bearing; 36. Lower threaded sleeve; 37. Lower deep groove ball bearing; 38. Eccentric guide shoe; 38a. Eccentric guide shoe center hole; 38b. Eccentric water eye; 38c. Spiral drainage groove; 38d. Alloy tooth. Detailed Implementation

[0039] In the following description of the invention, "inner" refers to the area closer to the tube string axis and "outer" refers to the area farther from the tube string axis. The orientations or positional relationships indicated herein are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0040] like Figure 1 As shown, the extended reach downhole casing and cementing assembly tool of the present invention includes a power guide shoe D located at the bottom of the casing string, a float collar C screwed above the power guide shoe D, a bypass valve B screwed above the float collar C, an oscillation device A screwed above the bypass valve B, and the upper end of the oscillation device A connected to the casing.

[0041] like Figures 2 to 7As shown, the oscillation device A includes an oscillation shaft 1, a spring plug 2, a spring cylinder 3, and an oscillation lower connector 10. The oscillation shaft 1, from top to bottom, has an upper connector 1a, a hexagonal tenon 1b, a smooth shaft section 1c, and a threaded section 1d. A through-hole is provided along the axis of the oscillation shaft. A spring sleeve 6 is screwed onto the upper part of the threaded section 1d. Disc springs 5 ​​are stacked above the spring sleeves 6, and multiple sets of disc springs 5 ​​are provided, for example, up to 10. Each disc spring 5 is fitted onto the outer periphery of the smooth shaft section 1c. A spring plug 2 is pressed above the top disc spring. A hexagonal hole 2a is provided along the axis of the spring plug 2, and the hexagonal hole 2a fits onto the hexagonal tenon 1b and matches with it. A spring washer 4 is provided between the bottom of the top disc spring and the spring plug 2, and a spring washer 4 is also provided between the top disc spring and the top of the spring sleeve 6. A spring cylinder bypass hole 3b is provided on the upper circumference of the cylinder body, which communicates with the cavity where the disc spring 5 is located, in order to avoid pressure buildup.

[0042] The lower outer periphery of the spring plug 2 is screwed with a downwardly extending spring cylinder 3. The inner cavity of the spring cylinder 3 is provided with an inner step 3a. The inner step 3a is located below the threaded section 1d of the oscillating shaft and is spaced apart by a certain distance.

[0043] An oscillator 9 is installed below the step 3a inside the spring cylinder. The bottom of the oscillator 9 abuts against the top of the oscillating lower connector 10. The upper external thread of the oscillating lower connector 10 is screwed into the lower port of the spring cylinder 3. The lower part of the external thread section of the oscillating lower connector 10 is provided with an oscillating lower connector sealing section. An oscillating lower connector sealing ring 10a is embedded in the outer periphery of the oscillating lower connector sealing section to achieve a seal with the lower end inner wall of the spring cylinder 3.

[0044] Below the spring sleeve 6 is an upper safety stop 7, which is screwed onto the threaded section 1d of the oscillating shaft. A wear-resistant ring 7a is embedded in the outer circumferential groove of the upper safety stop 7, and the outer wall of the upper wear-resistant ring 7a abuts against the inner wall of the spring cylinder 3.

[0045] Below the upper safety sleeve 7 is a lower safety sleeve 8, which is screwed onto the threaded section 1d of the oscillating shaft. A lower wear-resistant ring 8a is embedded in the outer circumferential groove of the lower safety sleeve 8, and the outer wall of the lower wear-resistant ring 8a abuts against the inner wall of the spring cylinder 3.

[0046] The lower end of the lower safety retainer 8 is provided with a reduced diameter section. The outer diameter of the reduced diameter section is smaller than the inner diameter of the step 3a inside the spring cylinder, so as to avoid interference with the spring cylinder 3 during oscillation.

[0047] The upper outer periphery of the lower safety retainer 8 is fitted with a step seal 8b to achieve a seal with the inner wall of the spring cylinder 3; below the threaded section 1d of the oscillating shaft, there is also an oscillating shaft sealing section 1e, and the outer periphery of the oscillating shaft sealing section 1e is provided with an oscillating shaft sealing groove 1f, in which an oscillating shaft sealing ring 1g is fitted to achieve a seal with the lower inner wall of the lower safety retainer 8.

[0048] The oscillator 9 has an axial inlet hole 9a extending downward along its axis at its upper center and an axial outlet hole 9p extending upward along its axis at its lower center. Three oscillation grooves are evenly distributed around the outer periphery of the middle section of the oscillator 9. The upper part of each groove has a jet inlet radial hole 9b, the inner port of which communicates with the axial inlet hole 9a. The lower part of each groove has a jet outlet radial hole 9n, the inner port of which communicates with the axial outlet hole 9p. The oscillator 9 is encased in a sealing alloy sleeve 9q.

[0049] A jet channel 9c extending axially downwards is provided directly below the outer port of the jet inlet radial hole 9b. The lower end of the jet channel 9c is connected to a gradually expanding channel 9d that is narrower at the top and wider at the bottom. A flow divider block 9e is provided at the center of the lower flared mouth of the gradually expanding channel 9d. The top of the flow divider block 9e is provided with a concave arc. Symmetrical deflection channels are formed between the two sides of the flow divider block 9e and the sidewalls of the gradually expanding channel 9d. The lower port of the gradually expanding channel 9d is connected to the vortex reversing chamber 9g. The outer port of the jet outlet radial hole 9n is located at the center of the vortex reversing chamber 9g. The lower part of the vortex reversing chamber 9g is provided with an annular channel 9h that is coaxial with the jet outlet radial hole 9n.

[0050] The upper part of the oscillating groove is provided with a semi-circular annular flow channel 9m. The semi-circular annular flow channel 9m is coaxial with the radial hole 9b of the jet inlet. At the throat where the jet flow channel 9c connects to the gradually expanding flow channel 9d, there are symmetrical arc-shaped flow channels that bend to both sides and upward. The two ends of the semi-circular annular flow channel 9m are connected to the outer ports of the corresponding arc-shaped flow channels through connecting flow channels. The lower ends of the two connecting flow channels are also connected to downward extending reversing flow channels. The lower ends of the two reversing flow channels approach each other and are connected to the upper parts of both sides of the vortex reversing chamber 9g.

[0051] This extended reach casing and cementing assembly is used during casing and cementing operations, connecting the completion casing and the power guide shoe. The spring sleeve 6 limits the lower part of the disc spring 5, and the upper safety stop 7 prevents the spring sleeve 6 from loosening. When the spring cylinder 3 floats with the spring plug 2, the upper wear-resistant ring 7a on the outer periphery of the upper safety stop 7 engages with the inner wall of the spring cylinder 3, providing a guiding function.

[0052] The lower safety retainer 8 rests against the lower safety retainer 7 below, and the lower wear-resistant ring 8a engages with the inner wall of the spring cylinder 3, resulting in smoother guidance. The step seal 8b on the outer periphery of the upper end of the lower safety retainer 8 seals the inner wall of the spring cylinder 3, and the oscillating shaft sealing ring 1g of the oscillating shaft sealing section 1e seals the oscillating shaft 1 with the inner wall of the lower safety retainer 8, ensuring that the drilling fluid flowing out from the central hole of the oscillating shaft enters the oscillator 9 to generate pulse oscillation.

[0053] The sealing alloy sleeve 9q is fitted around the outer periphery of the oscillator 9, sealing the outer periphery of the oscillator 9 and ensuring that the drilling fluid is confined to the flow in the three oscillation grooves on the circumferential surface of the oscillator 9.

[0054] During casing installation, drilling fluid enters through the axial inlet hole 9a of the oscillator and is ejected from the three radial inlet holes 9b, forming a high-speed jet. The high-speed jet flows downward along the jet channel 9c and enters the gradually expanding channel 9d. The flow area gradually increases, the flow velocity decreases, and the static pressure increases, forming a vortex at the concave arc at the top of the splitter block 9e. Due to the wall effect, the jet will deflect towards the deflection channel on one side of the splitter block 9e, where the flow area decreases and the flow velocity increases along the tangential jet direction vortex reversing chamber 9g.

[0055] The drilling fluid enters the vortex reversing chamber 9g from the deflection channel 9f1, forming a counterclockwise vortex. Part of the drilling fluid enters the radial outlet hole 9n of the jet. The jets from the three radial outlet holes 9n converge and are discharged from the axial outlet hole 9p of the oscillator, leaving the oscillator 9. The other part of the vortex flows into the reversing channel 9i1 after being turned by the annular channel 9h. It then flows into the semi-circular annular channel 9m through the connecting channel 9j1 and enters the connecting channel 9j2 from the other end of the semi-circular annular channel 9m. The outflow from the connecting channel 9j2 is divided into two streams. One stream flows back to the vortex reversing chamber 9g through the reversing channel 9i2, and the other stream flows through the arc-shaped channel 9k1 and rushes into the gradually expanding channel 9d with the high-speed jet flowing out of the jet channel 9c. When the liquid velocity in the arc-shaped flow channel 9k1 reaches a certain value, it forces the flow direction at the outlet end of the jet flow channel 9c to shift. That is, the liquid begins to flow from the deflection flow channel 9f2 into the vortex reversal chamber 9g. Since the liquid flow direction in the deflection flow channel 9f2 is opposite to the vortex direction, the counterclockwise vortex intensity begins to weaken until the vortex disappears.

[0056] Then, a clockwise vortex begins to form. A portion of the drilling fluid enters the radial outlet hole 9n of the jet. The jets from the three radial outlet holes 9n converge and exit through the axial outlet hole 9p of the oscillator, leaving the oscillator 9. Another portion of the vortex, after being redirected by the annular flow channel 9h, flows into the second reversing flow channel 9i2, then through the second connecting flow channel 9j2 into the semi-circular annular flow channel 9m. From the other end of the semi-circular annular flow channel 9m, it enters the first connecting flow channel 9j1. The outflow from the first connecting flow channel 9j1 splits into two streams: one flows back to the vortex reversing chamber 9g through the first reversing flow channel 9i1, and the other flows through the arc-shaped flow channel 9k2, then, along with the high-speed jet flowing out of the jet flow channel 9c, rushes into the gradually expanding flow channel 9d. When the liquid velocity in the arc-shaped flow channel 9k2 reaches a certain value, it forces the flow direction at the outlet end of the jet flow channel 9c to shift. That is, the liquid begins to flow from the deflection flow channel 9f1 into the vortex reversal chamber 9g. Since the liquid flow direction in the deflection flow channel 9f1 is opposite to the vortex direction, the clockwise vortex intensity begins to weaken until the vortex disappears.

[0057] This completes one working cycle. During one working cycle, the swirling flow field alternates between counterclockwise and clockwise swirling flows, thus generating periodic pressure pulsations.

[0058] Since the oscillator 9 is fixed between the step 3a inside the spring cylinder and the top of the oscillating lower connector 10, the pressure pulse generated by the oscillator 9 is applied to the entire well drilling tool, generating periodic axial vibration, thereby reducing the friction between the tubing and the well wall or casing, thus increasing the casing running speed; and during the cementing process, the generated oscillating pulse wave can effectively improve the cement slurry displacement efficiency, improve the bonding strength between the cement sheath and the interface of the tubing and well wall, and improve the cement stone strength and cementing quality.

[0059] The vibration is transmitted to the spring plug 2 through the spring cylinder 3. The hexagonal hole 2a of the spring plug 2 can slide on the hexagonal tenon 1b of the oscillating shaft and compress the disc spring 5 to store energy. When the disc spring 5 is compressed to its limit, the elastic potential energy is released, pushing the spring plug 2 upward. The top of the spring plug 2 hits the lower step of the upper connector 1a of the oscillating shaft, making the axial vibration stronger.

[0060] The three oscillating grooves of the oscillator 9 work together to achieve continuous reciprocating oscillation. During the generation of pulse oscillation, the oscillator has no mechanical cooperation, no rotation or axial movement, and the cross-section of each flow channel does not change. Moreover, each flow channel is not closed, and the flow channels are unobstructed, making it difficult for impurities to accumulate. After the casing is lowered into place, the flow channels of the oscillator 9 can be directly used as grouting channels for cement slurry. During the cement slurry injection process, the oscillating pressure wave generated by this tool plays a role similar to tamping, which can effectively improve the cement slurry displacement efficiency, improve the bonding strength between the cement sheath and the interface between the tubing and the well wall, and improve the cement stone strength and cementing quality.

[0061] like Figure 8 , Figure 9 As shown, the bypass valve B includes a bypass valve body 11. The middle section of the bypass valve body 11 is provided with a bypass section 11e. Multiple bypass holes 11f are evenly distributed in the lower middle part of the bypass section 11e. An inner boss 11c is provided above the bypass section 11e. An inner ring 11b is provided above the inner boss 11c. The diameter of the inner ring 11b is smaller than the diameter of the inner boss 11c.

[0062] A sliding sleeve 12 is provided in the central hole of the bypass valve housing. The sliding sleeve 12 has a large diameter section 12a and a small diameter section 12b from top to bottom. The top of the large diameter section 12a abuts against the lower part of the inner protrusion 11b of the housing. A sliding sleeve Glyd ring 18 and a sliding sleeve O-ring 19 are embedded on the outer periphery of the large diameter section 12a to achieve a seal with the inner wall of the inner protrusion 11c of the housing, and the sliding sleeve Glyd ring 18 is located above the sliding sleeve O-ring 19.

[0063] Below the bypass section 11e of the housing, there is a housing lower female thread section 11g with an enlarged inner diameter. The housing lower female thread section 11g is screwed into the middle external thread of the lower connector 17 of the bypass valve. Above the middle external thread 17d of the lower connector, there is a lower connector smooth rod section 17b with a reduced diameter. Above the lower connector smooth rod section 17b, there is a lower connector guide sleeve 17a with a reduced diameter and extending upward. The lower end of the small diameter section 12b of the sliding sleeve is inserted into the inner cavity of the lower connector guide sleeve 17a. The outer wall of the lower end of the small diameter section 12b of the sliding sleeve is fitted with a combined sealing ring 20 to achieve a seal with the inner wall of the lower connector guide sleeve 17a.

[0064] A control cam 13 is provided below the small diameter section 12b of the sliding sleeve. The wall thickness of the control cam 13 is equal to that of the small diameter section 12b of the sliding sleeve, and the outer wall of the control cam 13 is clearance-fitted with the inner wall of the lower connector guide sleeve 17a. A spring 15 is provided below the control cam 13. A spring upper seat 16a is provided at the top of the spring 15, and the spring upper seat 16a abuts against the bottom of the control cam 13; a spring lower seat 16b is provided at the bottom of the spring 15, and the spring lower seat 16b abuts against the inner step of the lower connector of the bypass valve.

[0065] The outer peripheral wall of the control cam 13 is symmetrically provided with cam control grooves 13a, and the circumference of the lower connector smooth rod section 17b is symmetrically provided with lower connector pin holes 17c. Cam pins 14 are screwed into the lower connector pin holes 17c respectively, and the inner ends of the cam pins 14 are respectively embedded in the cam control grooves 13a. The tension of the spring 15 keeps the control cam 13 and the sliding sleeve 12 in an upward sliding tendency, and the inner ends of the cam pins 14 control the control cam 13 at the required height.

[0066] The cam control slot 13a includes multiple sets of alternating, downward-opening cam long slots 13a1 and cam short slots 13a2. The cam pin 14 is fixed. When the control cam 13 floats, the cam pin 14 alternately engages with the cam long slot 13a1 and cam short slot 13a2.

[0067] Each cam long groove 13a1 extends axially upward to the upper part of the control cam 13. Each cam long groove 13a1 and cam short groove 13a2 is provided with an upward-opening transition groove 13a3 below them. Each cam long groove 13a1, cam short groove 13a2 and transition groove 13a3 has an inlet inclined surface at its inlet and an outlet vertical wall at its outlet. The inlet inclined surface of each transition groove 13a3 is located below the outlet vertical wall of the cam long groove 13a1, and the outlet vertical wall of each transition groove 13a3 is located below the inlet inclined surface of the cam short groove 13a2.

[0068] The lower end of the inner boss 11c is provided with a guide cone surface 11d or a guide arc surface that is larger at the bottom and smaller at the top, and the outer periphery of the top of the large diameter section 12a of the sliding sleeve is provided with an outer chamfer. When the sliding sleeve 12 returns upward, under the tension of the spring 15, the outer chamfer at the top of the large diameter section 12a of the sliding sleeve contacts the guide cone surface 11d at the lower end of the inner boss 11c, which facilitates sliding into the inner cavity of the inner boss 11c.

[0069] The length of the inner boss 11c is greater than the length of the large diameter section 12a of the sliding sleeve, so as to ensure that when the sliding sleeve 12 is in the high position, the outer periphery of the large diameter section 12a of the sliding sleeve is reliably sealed with the inner wall of the inner boss 11c of the housing.

[0070] The distance between the upper edge of the top housing bypass hole 11f and the bottom of the inner boss 11c is greater than the length of the large-diameter section 12a of the sliding sleeve, and the top of the lower connector guide sleeve 17a is higher than the upper edge of the top housing bypass hole 11f. The annular space between the inner wall of the housing bypass section 11e and the outer wall of the lower connector guide sleeve 17a serves as an annular confluence channel. Drilling fluid, cleaning fluid, or cement slurry entering the annular confluence channel flows out from each housing bypass hole 11f on the full circumference of the housing bypass section 11e. When the bottom of the large-diameter section 12a of the sliding sleeve rests on the upper port of the lower connector guide sleeve 17a, the space between the top of the large-diameter section 12a of the sliding sleeve and the bottom of the inner boss 11c of the housing serves as the fluid inlet channel of the annular confluence channel.

[0071] The upper port of the bypass valve housing is provided with a female thread section 11a, and the inner convex ring 11b is located below the female thread section 11a. The lower outer periphery of the lower connector 17 of the bypass valve is provided with a lower external thread 17e, which is screwed onto the tool or sleeve below.

[0072] The central hole of the inner ring 11b serves as the axial channel for fluid, and the bottom step of the inner ring 11b provides positioning for the large-diameter section 12a of the sliding sleeve. The cross-sectional area of ​​the large-diameter section 12a of the sliding sleeve is larger than that of the small-diameter section 12b. When the wellhead mud pump is started, the pressure on the upper side of the large-diameter section 12a of the sliding sleeve is greater than that on the lower side, pushing the sliding sleeve downward. The inner end of the cam pin 14 slides into the cam groove 13a1, causing the large-diameter section 12a of the sliding sleeve to slide out from the inner cavity of the inner boss 11c of the casing and enter the bypass section 11e of the casing. The drilling fluid enters the annular confluence groove on the outer periphery of the lower connector guide sleeve 17a from the top of the large-diameter section 12a of the sliding sleeve. After being evenly distributed by the annular confluence groove, it flows out from the bypass holes 11f of the casing in each row and column and enters the casing annulus. At this time, the power guide shoe at the bottom of the casing does not rotate and moves directly downward.

[0073] When encountering a high-friction section, the mud pump is shut off, and the pressure above the large-diameter section 12a of the sliding sleeve decreases. Under the tension of the spring 15, the sliding sleeve 12 moves upward, and the large-diameter section 12a slides into the bottom of the inner boss 11c of the casing. At this time, the cam pin 14 slides out from the lower end of the cam groove 13a1 and enters the transition groove 13a3. Under the action of the guide slope of the transition groove 13a3, the cam 13 is controlled to rotate at an angle, so that the cam pin 14 slides into the deepest part of the transition groove 13a3.

[0074] The mud pump is restarted, and the sliding sleeve 12 descends again. The cam pin 14 slides out of the transition groove 13a3 and enters the cam short groove 13a2. Under the action of the guide slope of the cam short groove 13a2, the cam 13 is controlled to continue rotating until it slides into the deepest part of the cam short groove 13a2. At this time, the sliding sleeve 12 is in a high position, and the large diameter section 12a of the sliding sleeve is still in the inner cavity of the inner boss 11c of the shell and is in a sealed state. At this time, the drilling fluid flows down along the central hole of the sliding sleeve 12 and flows out from the water eye of the power guide shoe. Under the action of the drilling fluid, the power guide shoe rotates and searches for the wellbore.

[0075] When the mud pump is turned off, under the tension of the spring 15, the sliding sleeve 12 moves upward and the large diameter section 12a of the sliding sleeve slides into the bottom of the inner boss 11c of the housing. At this time, the cam pin 14 slides out from the lower end of the cam short groove 13a2 and enters the transition groove 13a3. Under the action of the guide slope of the transition groove 13a3, the cam 13 is controlled to rotate at an angle, so that the cam pin 14 slides into the deepest part of the transition groove 13a3.

[0076] The mud pump is restarted, and the sliding sleeve 12 descends again. The cam pin 14 slides out of the transition groove 13a3 and enters the cam long groove 13a1. Under the action of the guide slope of the cam long groove 13a1, the cam 13 is controlled to continue rotating until it slides into the deepest part of the cam long groove 13a1. At this time, the sliding sleeve 12 is in a low position, and the large diameter section 12a of the sliding sleeve is disengaged from the inner cavity of the inner boss 11c of the housing. At this time, the drilling fluid enters from the top of the large diameter section 12a of the sliding sleeve into the annular confluence groove between the inner wall of the housing bypass section 11e and the outer wall of the lower connector guide sleeve 17a. The drilling fluid flows out from each housing bypass hole 11f on the full circumference of the housing bypass section 11e, and the power guide shoe stops rotating.

[0077] Once the casing is in place, the cam pin 14 is engaged at the bottom of the cam groove 13a1, and the sliding sleeve 12 remains in the low position, meaning the bypass channel is open. The cleaning fluid flows down the casing, exits from the bypass holes 11f of each housing of the bypass valve, and rises along the annulus between the casing and the wellbore, cleaning the mud cake on the well wall and carrying it to the surface.

[0078] like Figures 10 to 14As shown, the power guide shoe D includes a tool upper connector 21, a bearing clamping connector 22, a spindle 26, a turbine device 27, and an eccentric guide shoe 38. The lower end of the tool upper connector 21 is screwed with the bearing clamping connector 22, the lower end of the bearing clamping connector 22 is screwed with the turbine housing 25, the lower end of the turbine housing 25 is screwed with the centralizer connector 30, and the lower end of the centralizer connector 30 is screwed with the centralizer 31. The inner cavity of the bearing clamping connector 22 is provided with an upper connecting shaft 24, the upper part of the upper connecting shaft 24 is supported by a bearing on the inner wall of the bearing clamping connector 22. The inner cavity of the turbine housing 25 is provided with the turbine device 27, the turbine device 27 is fixed on the outer periphery of the spindle 26, the upper end of the spindle 26 is screwed with the lower end of the upper connecting shaft 24, and the lower end of the spindle 26 is screwed with the upper end of the lower connecting shaft 28, that is, the upper threaded section 28a of the lower connecting shaft is screwed into the central threaded hole at the lower part of the spindle 26.

[0079] The middle section of the lower connecting shaft 28 is supported on the inner wall of the stabilizer 31 by a bearing, and the lower end of the lower connecting shaft 28 is screwed with an eccentric guide shoe 38; the bottom of the center hole 24a of the upper connecting shaft is connected to the upper space of the turbine device 27 through the evenly distributed upper connecting shaft bypass holes 24b, the upper part of the center hole 28f of the lower connecting shaft is connected to the lower space of the turbine device 27 through the evenly distributed lower connecting shaft bypass holes 28b, and the lower end of the center hole 28f of the lower connecting shaft is connected to the eccentric water eye 38b of the eccentric guide shoe 38 through the center hole 38a of the eccentric guide shoe.

[0080] The turbine assembly 27 includes multiple sets of turbine stators 27a and turbine rotors 27b. Each turbine stator 27a is stacked and fixed to the inner wall of the turbine housing 25, and each turbine rotor 27b is stacked and fixed to the outer periphery of the spindle 26. The turbine rotors 27b and turbine stators 27a are paired one-to-one.

[0081] The lower port of the bearing clamping joint 22 presses against the top turbine stator 27a, and the upper port of the centralizer joint 30 abuts against the bottom turbine stator 27a.

[0082] The upper port of the top turbine rotor rests against the shoulder of the upper connecting shaft 24, and the lower port of the bottom turbine rotor rests against the shoulder of the lower connecting shaft 28 via the washer 29.

[0083] The upper part of the inner cavity of the centralizer 31 is provided with an inner step 31a. An upper thrust bearing 33 is provided above the inner step 31a. An upper threaded sleeve 32 is pressed above the upper thrust bearing 33 and screwed onto the upper threaded section 28c of the lower connecting shaft. A lower thrust bearing 35 is provided below the inner step 31a. A lower threaded sleeve 36 is pressed below the lower thrust bearing 35 and screwed onto the middle threaded section 28d of the lower connecting shaft. A lower deep groove ball bearing 37 is provided below the lower threaded sleeve 36 and its bottom abuts against the boss 28e of the lower connecting shaft. Two lower deep groove ball bearings 37 are stacked axially.

[0084] A spacer 34 is provided between the lower inner edge of the upper threaded sleeve 32 and the upper inner edge of the lower threaded sleeve 36. The upper thrust bearing 33 and the lower thrust bearing 35 are fitted around the outer periphery of the spacer 34.

[0085] The upper threaded sleeve 32 and the inner step 31a of the centralizer provide axial positioning for the upper thrust bearing 33. The inner circumference of the upper cover of the upper thrust bearing 33 is tightly fitted with the outer wall of the spacer 34 and has a clearance fit with the inner wall of the centralizer 31. The lower cover of the upper thrust bearing 33 is tightly fitted with the inner wall of the centralizer 31 and has a clearance fit with the outer wall of the spacer. The upper cover of the lower thrust bearing 35 is tightly fitted with the inner wall of the centralizer 31 and has a clearance fit with the outer wall of the spacer. The inner circumference of the lower cover of the lower thrust bearing 35 is tightly fitted with the outer wall of the spacer and has a clearance fit with the inner wall of the centralizer 31. The upper thrust bearing 33 and the lower thrust bearing 35, supported on both sides of the inner step 31a of the centralizer, can withstand the axial load of the spindle 26 and the lower connecting shaft 28.

[0086] The upper part of the upper connecting shaft 24 is supported on the inner wall of the bearing clamping joint 22 by an upper deep groove ball bearing 23. The top of the upper deep groove ball bearing 23 presses against the inner edge of the lower port of the upper tool connector 21, and the bottom of the upper deep groove ball bearing 23 is supported on the inner step of the bearing clamping joint 22. Two upper deep groove ball bearings 23 are stacked axially. The upper deep groove ball bearings 23 and the lower deep groove ball bearing 37 bear the radial load of the spindle 26.

[0087] The upper outer periphery of the eccentric guide shoe 38 is uniformly provided with four spiral drainage grooves 38c, and alloy teeth 38d are uniformly welded on the supporting ribs between adjacent spiral drainage grooves 38c.

[0088] High-pressure drilling fluid enters the center hole 24a of the upper connecting shaft through the center hole of the tool connector 21, and is ejected outward from the three upper connecting shaft bypass holes 24b on the circumference of the upper connecting shaft 24. The upper connecting shaft bypass holes 24b are elongated oval holes that extend vertically and slope downward. Then, the high-pressure drilling fluid enters the space where the turbine device 27 is located and is ejected downward from the swirl grooves of each stage of the turbine stator 27a, driving the turbine rotor 27b that it is paired with to rotate. The turbine stator 27a and the turbine rotor 27b are paired to form a working unit.

[0089] The stacked turbine stator 27a is clamped between the lower port of the bearing clamping joint 22 and the upper port of the centralizer joint 30 for axial positioning, and is fixed in place like the turbine housing 25. The turbine rotor 27b is fitted and stacked on the outer periphery of the spindle 26, and is clamped between the shoulder of the upper connecting shaft 24 and the shoulder of the lower connecting shaft 28 for axial positioning, and rotates synchronously with the drive spindle 26. The washer 29 has a structure that is wider at the top and narrower at the bottom and is fitted on the lower outer periphery of the spindle 26, and together with the lower port of the spindle, it abuts against the shoulder of the lower connecting shaft 28.

[0090] Each stage of the turbine rotor 27b drives the spindle 26 to rotate, generating a large rotational driving force. The upper end of the spindle 26 is supported by the upper connecting shaft 24 and the upper deep groove ball bearing 23 and rotates in the bearing clamping joint 22, while the lower end of the spindle 26 is supported by the lower connecting shaft 28 and the lower deep groove ball bearing 37 and rotates in the centralizer 31.

[0091] The drilling fluid discharged from the bottom of the turbine unit 27 flows into the center hole 28f of the lower connecting shaft through the bypass holes 28b of each lower connecting shaft, enters the center hole 38a of the eccentric guide shoe from the lower end of the center hole 28f of the lower connecting shaft, and then sprays out from each eccentric water eye 38b, thereby increasing the rotational power of the eccentric guide shoe 38.

[0092] The four spiral drainage grooves 38c on the upper outer periphery of the eccentric guide shoe 38 facilitate drilling fluid backflow, while the alloy teeth 38d evenly welded on the support ribs provide a cutting action, further improving the running-in effect. The centralizer 31 enables the tool to automatically center itself in the wellbore. The lower part of the eccentric guide shoe 38 is equipped with an eccentric guiding structure, which can automatically rotate its angle through contact and compression with the well wall. When encountering well wall steps, it can easily climb autonomously, find the wellbore direction, overcome obstruction problems, and continue to advance, thereby safely running the casing string to the predetermined position.

[0093] After the casing is in place, cement slurry is injected from the wellhead. The cement slurry flows downward from the center hole of the bypass valve B, then pushes open the ball valve of the float collar C to enter the power guide shoe D, flows out from each eccentric water hole and enters the annulus of the casing. After the cement slurry is injected to the predetermined height, a rubber plug is dropped from the wellhead. Then, the drilling fluid pushes the rubber plug down along the casing. The rubber plug pushes out the cement slurry in the casing until the rubber plug reaches the float collar and is locked and generates pressure. The one-way valve core of the float collar prevents the cement slurry from flowing back. After the cement slurry solidifies, the cementing is completed.

[0094] If debris in the cement grout blocks the water hole of the power guide shoe D during the cement grouting process, the bypass channel of the bypass valve B can be opened by starting and stopping the mud pump, and the cement grout will flow out from the bypass hole of the bypass valve B and enter the casing annulus.

[0095] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Besides the above embodiments, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention. Technical features of the present invention not described can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A large-displacement downhole casing and cementing assembly tool, comprising a power guide shoe located at the bottom of the casing string, characterized in that: A float band is screwed onto the top of the power guide shoe, a bypass valve is screwed onto the top of the float band, and an oscillation device is screwed onto the top of the bypass valve. The upper end of the oscillation device is connected to a sleeve. The oscillation device includes an oscillation shaft, which, from top to bottom, has an upper oscillation shaft connector, a hexagonal tenon, a smooth shaft section, and a threaded shaft section. A through-hole is provided along the axis of the oscillation shaft. A spring sleeve is screwed onto the upper part of the threaded shaft section, and multiple disc springs are stacked above the spring sleeve. Each disc spring is fitted onto the outer periphery of the smooth shaft section. A spring plug is pressed above the top disc spring, and a hexagonal hole is provided along the axis of the spring plug. The hexagonal hole is fitted onto the hexagonal tenon of the oscillating shaft and they are matched. A downwardly extending spring cylinder is screwed to the lower outer circumference of the spring plug. The inner cavity of the spring cylinder has an internal step. The internal step of the spring cylinder is located below the threaded section of the oscillating shaft and is spaced apart by a distance. An oscillator is installed below the internal step of the spring cylinder. The bottom of the oscillator abuts against the top of the lower oscillating connector. The upper external thread of the lower oscillating connector is screwed into the lower port of the spring cylinder. The bypass valve includes a bypass valve housing. A bypass section is provided in the middle section of the bypass valve housing. Multiple bypass holes are evenly distributed in the lower middle part of the bypass section. An inner boss is provided above the bypass section, and an inner ring is provided above the inner boss. The diameter of the inner ring is smaller than the diameter of the inner boss. A sliding sleeve is provided in the central hole of the bypass valve housing. The sliding sleeve has a large-diameter section and a small-diameter section from top to bottom. The top of the large-diameter section abuts against the lower part of the inner ring, and the outer periphery of the large-diameter section seals against the inner wall of the inner boss. A lower female thread with an enlarged inner diameter is provided below the bypass section. The lower female thread section of the housing is screwed into the middle external thread of the lower connector of the bypass valve. Above the middle external thread of the lower connector is a reduced-diameter lower connector smooth rod section, and above the smooth rod section is a reduced-diameter and upward-extending lower connector guide sleeve. The lower end of the small-diameter section of the sliding sleeve is inserted into the inner cavity of the lower connector guide sleeve and they are sealed to each other. Below the small-diameter section of the sliding sleeve is a control cam, and the lower part of the control cam is supported by a spring on the inner step of the lower connector of the bypass valve. The outer peripheral wall of the control cam is symmetrically provided with cam control grooves, and cam pins are symmetrically screwed into the circumference of the smooth rod section of the lower connector, and the inner ends of the cam pins are respectively embedded in the cam control grooves. The cam control groove includes multiple sets of alternating, downward-opening long cam grooves and short cam grooves. When the control cam floats, the cam pins alternately engage with the long cam grooves and short cam grooves. Each long cam groove extends axially upward to the upper part of the control cam. Each long cam groove and short cam groove has an upward-opening transition groove below it. Each long cam groove, short cam groove, and transition groove has an inlet inclined surface at its inlet and an outlet vertical wall at its outlet. The inlet inclined surface of each transition groove is located below the outlet vertical wall of the long cam groove, and the outlet vertical wall of each transition groove is located below the inlet inclined surface of the short cam groove.

2. The large-displacement downhole casing and cementing combination tool according to claim 1, characterized in that: Below the spring sleeve is an upper safety stop, which is screwed onto the threaded section of the oscillating shaft. An upper wear-resistant ring is embedded in the outer circumferential groove of the upper safety stop, and the outer wall of the upper wear-resistant ring abuts against the inner wall of the spring cylinder. Below the upper safety stop is a lower safety stop, which is screwed onto the threaded section of the oscillating shaft. A lower wear-resistant ring is embedded in the outer circumferential groove of the lower safety stop, and the outer wall of the lower wear-resistant ring abuts against the inner wall of the spring cylinder. The lower end of the lower safety stop has a reduced diameter section, the outer diameter of which is smaller than the inner diameter of the inner step of the spring cylinder.

3. The large-displacement downhole casing and cementing combination tool according to claim 1, characterized in that: The oscillator has an axial inlet hole extending downward along its axis at the center of its upper end, and an axial outlet hole extending upward along its axis at the center of its lower end. Three oscillation grooves are evenly distributed around the outer periphery of the middle section of the oscillator. The upper part of each oscillation groove has a jet inlet radial hole, the inner port of which communicates with the axial inlet hole. The lower part of each oscillation groove has a jet outlet radial hole, the inner port of which communicates with the axial outlet hole. A sealing alloy sleeve covers the outer periphery of the oscillator.

4. The large-displacement downhole casing and cementing combination tool according to claim 3, characterized in that: A jet channel extending axially downwards is provided directly below the outer port of the radial hole of the jet inlet. The lower end of the jet channel is connected to a gradually expanding channel that is narrower at the top and wider at the bottom. A flow divider block is provided at the center of the lower flared mouth of the gradually expanding channel. The top of the flow divider block is provided with a concave arc. Symmetrical deflection channels are formed between the two sides of the flow divider block and the sidewalls of the gradually expanding channel. The lower port of the gradually expanding channel is connected to the vortex reversing chamber. The outer port of the radial hole of the jet outlet is located at the center of the vortex reversing chamber. The lower part of the vortex reversing chamber is provided with an annular channel coaxial with the radial hole of the jet outlet.

5. The large-displacement downhole casing and cementing combination tool according to claim 4, characterized in that: The upper part of the oscillating groove is provided with a semi-circular annular flow channel. The semi-circular annular flow channel is coaxial with the radial hole of the jet inlet. At the throat where the jet flow channel connects to the gradually expanding flow channel, there are symmetrical arc-shaped flow channels that bend to both sides and upward. The two ends of the semi-circular annular flow channel are connected to the outer ports of the corresponding arc-shaped flow channels through connecting flow channels. The lower ends of the two connecting flow channels are also connected to downward extending reversing flow channels. The lower ends of the two reversing flow channels approach each other and are respectively connected to the upper parts of both sides of the vortex reversing chamber.

6. The extended reach downhole casing and cementing assembly tool according to claim 1, characterized in that: The power shoe includes a tool upper connector, the lower end of which is screwed with a bearing clamping connector. The lower end of the bearing clamping connector is screwed with a turbine housing. The lower end of the turbine housing is screwed with a centralizer connector. The lower end of the centralizer connector is screwed with a centralizer. The inner cavity of the bearing clamping connector is provided with an upper connecting shaft. The upper part of the upper connecting shaft is supported by a bearing on the inner wall of the bearing clamping connector. The inner cavity of the turbine housing is provided with a turbine device. The turbine device is fixed to the outer circumference of the spindle. The upper end of the spindle is connected to the upper connecting shaft. The lower ends are screwed together, with the lower end of the mandrel screwed together with the upper end of the lower connecting shaft. The middle section of the lower connecting shaft is supported by a bearing on the inner wall of the stabilizer. An eccentric guide shoe is screwed onto the lower end of the lower connecting shaft. The bottom of the center hole of the upper connecting shaft communicates with the upper space of the turbine device through evenly distributed upper connecting shaft bypass holes. The upper part of the center hole of the lower connecting shaft communicates with the lower space of the turbine device through evenly distributed lower connecting shaft bypass holes. The lower end of the center hole of the lower connecting shaft communicates with the eccentric water eye of the eccentric guide shoe through the center hole of the eccentric guide shoe.

7. The extended reach downhole casing and cementing assembly tool according to claim 6, characterized in that: The turbine assembly includes multiple turbine stators and turbine rotors. Each turbine stator is stacked and fixed to the inner wall of the turbine housing, and each turbine rotor is stacked and fixed to the outer periphery of the spindle. The turbine rotors and turbine stators are paired one-to-one. The lower port of the bearing clamping joint presses against the top turbine stator, and the upper port of the stabilizer joint abuts against the bottom turbine stator. The upper port of the top turbine rotor abuts against the shoulder of the upper connecting shaft, and the lower port of the bottom turbine rotor abuts against the shoulder of the lower connecting shaft through a washer.

8. The large-displacement downhole casing and cementing combination tool according to claim 6, characterized in that: The upper part of the inner cavity of the centralizer is provided with an inner step. An upper thrust bearing is provided above the inner step, and an upper threaded sleeve is pressed above the upper thrust bearing. The upper threaded sleeve is screwed onto the upper middle threaded section of the lower connecting shaft. A lower thrust bearing is provided below the inner step, and a lower threaded sleeve is pressed below the lower thrust bearing. The lower threaded sleeve is screwed onto the middle threaded section of the lower connecting shaft. A lower deep groove ball bearing is provided below the lower threaded sleeve, and the bottom of the lower deep groove ball bearing abuts against the boss of the lower connecting shaft. A spacer is supported between the lower inner edge of the upper threaded sleeve and the upper inner edge of the lower threaded sleeve. The upper thrust bearing and the lower thrust bearing are fitted onto the outer periphery of the spacer.

Images