Oscillating impact drilling tools

Abstract

The present invention relates to the technical field of downhole tools for oil and gas drilling, and is an oscillating impact drilling tool, comprising an upper joint, a sleeve, a limiting cylinder, a core body, a hammer and an anvil. The outer side of the lower part of the upper joint is fixedly installed together with the inner side of the upper part of the sleeve, and the lower part of the sleeve is sleeved with a lower joint. The limiting cylinder is fixedly installed in the sleeve at a position between the lower end of the upper joint and the upper end of the lower joint. The oscillating impact drilling tool utilizes the hydraulic energy of the drilling fluid to modulate a high-frequency pulse jet, and excites the lower drill string or drill bit to perform high-frequency axial impact and torsional impact, thereby changing the motion state of the lower drill string, making the energy transfer and conversion inside the drill string system more orderly and stable, thereby improving the safety and efficiency of the drilling operation and saving the drilling cost. The oscillating impact drilling tool has the advantages of being easy to use, safe and reliable, and having adjustable parameters. It is suitable for a variety of drilling platforms and has important practical significance for the safe and rapid drilling of deep wells and ultra-deep wells.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools for oil and natural gas drilling, and is an oscillation impact drilling tool. Background Art

[0002] As the exploration and development of conventional oil and gas resources gradually enters the middle and late stages, the focus of my country's oil and gas exploration and development has gradually shifted to deep earth and deep sea, and the number of deep wells and ultra-deep wells has increased significantly. As the depth of the well continues to increase, the slenderness ratio of the drill string increases, and the flexible drill string is prone to instability, and it is more likely to experience violent drill string vibration, which can easily lead to a decrease in mechanical drilling speed and damage to drilling tools, increasing the risk and cycle of drilling operations, increasing capital investment, and seriously affecting drilling efficiency.

[0003] The Chinese patent document with publication number CN112459755A and titled Pulse jet generator, generator, water injection and plugging removal integrated string and method discloses a pulse jet generator, which includes a first nozzle, a second nozzle and a third nozzle arranged in sequence from top to bottom, a primary oscillation cavity is provided between the first nozzle and the second nozzle, a secondary oscillation cavity is provided between the second nozzle and the third nozzle, the first nozzle, the primary oscillation cavity, the second nozzle, the secondary oscillation cavity and the third nozzle are connected in sequence, and the stable continuous fluid flowing in from the first nozzle is converted into a pulse jet when flowing through the primary oscillation cavity and the secondary oscillation cavity and then ejected from the third nozzle. However, as the well depth increases and the surrounding pressure increases, the impact energy of the continuous jet formed by the pulse jet generator decreases, which seriously affects the perforation quality, resulting in large friction resistance of the hole, high fracture initiation pressure and high construction risk.

[0004] A Chinese patent document with publication number CN118088030A discloses a mechanical shaft torsional impact drilling speed-up tool, which includes a valve body, a valve core, a valve sleeve, a reset spring, an outer cylinder, a distribution cylinder, a distribution plate, a distribution block, a driving device, an upper driving rod, a lower driving rod, a connecting cylinder, an axial impact assembly, a drill bit shaft and an energy storage spring. A valve sleeve is installed on the inner side of the lower part of the valve body, a first limiting ring platform is provided on the inner side of the upper part of the valve body, a valve core is provided in the valve sleeve with the upper end abutting against the lower side of the first limiting ring platform, a reset spring is provided between the valve core and the valve sleeve, at least one inner bypass hole is provided on the outer side of the middle part of the valve core corresponding to the position above the valve sleeve, and an outer bypass hole is provided on the outer side of the valve body corresponding to the position of the inner bypass hole; an outer cylinder is provided on the outer side of the lower end of the valve body, a second limiting ring platform is provided on the inner side of the upper part of the outer cylinder, and a valve core with the upper end abutting against the lower side of the first limiting ring platform is provided on the seat of the second limiting ring platform. The distribution tube on the lower side of the valve body has a distribution plate on the inner side of the upper part of the distribution tube, and a distribution hole that is eccentrically arranged and runs through from top to bottom is arranged in the middle of the distribution plate. The distribution plate corresponding to the outer position of the distribution hole is provided with a number of flow holes that run through from top to bottom; a driving device is arranged in the middle of the outer tube, an upper driving rod is arranged on the upper part of the driving device, and a distribution block that can periodically block the distribution hole by rotation is arranged on the upper end of the upper driving rod, a lower driving rod is arranged at the lower part of the driving device, and a connecting tube is fixedly installed at the lower end of the lower driving rod, and a number of liquid inlet holes are distributed along the circumference on the outer side of the upper part of the connecting tube, and an axial impact assembly that can periodically reciprocate up and down with the rotation of the lower driving rod is arranged on the outer side of the middle part of the connecting tube, and a drill bit shaft whose lower end is located below the outer tube is fixedly installed on the outer side of the lower end of the connecting tube, and an energy storage spring is arranged on the outer side of the connecting tube corresponding to the position between the drill bit shaft and the axial impact assembly. However, the circumferential impact drilling speed-up tool can only provide one-dimensional impact; the overall structure is complex and easily damaged by erosion.

[0005] Traditional passive vibration reduction technology cannot be actively adjusted, has poor applicability, and cannot meet the needs of practical applications. The development of emerging active control technology is still insufficient, theoretical research needs to be improved, and the performance of some downhole tools cannot meet the requirements of actual drilling operations.

[0006] In order to solve the problem of severe vibration of the drill string during deep and ultra-deep well drilling, two types of vibration reduction technologies, passive vibration reduction technology and active vibration reduction technology, were developed based on various factors that affect drill string vibration (including drilling pressure, rotation speed, drill bit type, drill string stiffness, system damping, and drill bit rock breaking). A series of downhole tools including dampers, hydraulic oscillators, torsion impactors, axial impactors, and rotary impact tools were developed, as well as a series of new drill bits such as new composite drill bits, special-shaped PDC drill bits, and diverter negative pressure drill bits. To a certain extent, the problem of severe vibration of the drill string during deep and ultra-deep well drilling has been solved. However, the above methods all have certain shortcomings. The passive vibration reduction technology has a narrow applicability and poor adaptability in the face of complex and changeable drilling conditions. Some downhole tools have insufficient performance and small impact frequency and amplitude. Therefore, developing active control technology that can effectively suppress drill string vibration and developing high-performance downhole tools are necessary ways to improve the drilling efficiency, safety and oil and gas resource development efficiency of deep and ultra-deep wells, and are also an effective means to cope with the fierce competition in the domestic and international oil drilling markets. Summary of the invention

[0007] The present invention provides an oscillating impact drilling tool, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of severe vibration of the drill string during drilling and low efficiency and safety of drilling operations in the existing downhole tools.

[0008] The technical solution of the present invention is achieved through the following measures: an oscillating impact drilling tool, an upper joint, a sleeve, a limiting cylinder, a core body, a hammer and anvil, the outer side of the lower part of the upper joint is fixedly installed together with the inner side of the upper part of the sleeve, the lower part of the sleeve is sleeved on the inner side, the limiting cylinder is fixedly installed in the sleeve corresponding to the position between the lower end of the upper joint and the upper end of the lower joint, the lower limit ring is fixedly installed on the inner side of the lower end of the limiting cylinder, the core body is fixedly installed on the inner side of the upper part of the limiting cylinder, a jet channel that runs through from top to bottom and can generate pulse fluid is provided in the core body, a guide plate is provided on the inner side of the lower end of the jet channel, and a conical tube with a larger upper part and a smaller lower part is fixedly installed on the inner side of the upper part of the lower joint. An anvil, a supporting ring platform seated on the upper end of the lower limit ring platform is fixedly installed on the outer side of the upper end of the anvil, a driving rod with a hollow structure is fixedly installed on the upper end of the anvil, a hammer mounted on the inner side of the lower part of the limit cylinder is fixedly installed on the upper end of the driving rod, a spacing is provided between the upper end of the hammer and the lower end of the core body, an upper limit ring platform is fixedly provided on the inner side of the lower part of the limit cylinder corresponding to the lower side position of the hammer, a transmission rod is installed for transmission between the hammer and the guide plate, a plurality of jet outlets which pass through the upper end of the guide plate corresponding to the outer side of the transmission rod are provided along the circumference at intervals, and a torsion channel is provided on the upper end of the hammer corresponding to the outer side of the transmission rod, and the fluid flowing through the torsion channel can drive the hammer to rotate.

[0009] The following are further optimizations and / or improvements to the above technical solutions:

[0010] The above-mentioned jet channel may include an injection channel, a primary oscillation cavity and a secondary oscillation cavity. A closed primary oscillation cavity and a secondary oscillation cavity are provided at upper and lower intervals in the core body. The upper end of the core body corresponding to the lower end position of the upper joint is provided with a injection channel, the lower end of which is connected with the upper part of the primary oscillation cavity. The injection channel is funnel-shaped with a larger upper part and a smaller lower part. A connecting through hole connecting the lower part of the primary oscillation cavity and the upper part of the secondary oscillation cavity is provided in the middle part of the core body. The lower end of the core body is provided with a confluence channel, the upper end of which is connected with the lower part of the secondary oscillation cavity, and the guide plate is mounted in the confluence channel.

[0011] The above-mentioned first-level oscillation cavity may include a first conical hole section and a first straight hole section that are connected in sequence from top to bottom, the first conical hole section is in the shape of a cone with a small top and a large bottom, a first truncated cone-shaped connector with a small top and a large bottom is fixed to the lower part of the first straight hole section, and the upper end of the connecting through hole extends to the upper end of the first connector, and the second-level oscillation cavity includes a second conical hole section and a second straight hole section that are connected in sequence from top to bottom, the second conical hole section is in the shape of a cone with a small top and a large bottom, a second truncated cone-shaped connector with a small top and a large bottom is fixed to the lower part of the second straight hole section, and the upper end of the confluence channel extends to the upper end of the second connector.

[0012] The inner wall of the upper end of the above-mentioned first tapered hole section may be provided with a plurality of first guide grooves opening inwardly distributed along the circumference, and the plurality of first guide grooves opening inwardly all extend along the spiral direction to the lower end of the first straight hole section; the inner wall of the upper end of the second tapered hole section may be provided with a plurality of second guide grooves opening inwardly distributed along the circumference, and the plurality of second guide grooves opening inwardly all extend along the spiral direction to the lower end of the second straight hole section.

[0013] A nozzle may be provided in the connecting through hole, and locking nuts are fixedly installed in the connecting through holes corresponding to the upper and lower ends of the nozzle.

[0014] A lower mounting hole which passes through from top to bottom may be provided at the center of the upper end of the above-mentioned hammer, and an upper mounting hole which passes through from top to bottom may be provided at the center of the guide plate corresponding to the position of the lower mounting hole. The cross-sections of the upper mounting hole and the lower mounting hole are both polygonal, and the cross-section of the transmission rod matches the cross-section of the lower mounting hole. The outer side of the upper part of the transmission rod is fixedly installed in the upper mounting hole, and the lower end of the transmission rod is fixedly installed in the lower mounting hole.

[0015] The above-mentioned torsion channel may include an axial hole and a torsion hole. An axial hole passing through the upper and lower ends of the hammer corresponding to the position between the inner side of the driving rod and the outer side of the transmission rod is provided. A torsion hole with an end extending to the outer side of the hammer is provided in the middle of the axial hole. The torsion hole is arranged in a vortex shape.

[0016] The structure of the present invention is reasonable and compact. The upper joint is used to connect the upper drill string. The lower outer side of the anvil and the upper inner side of the lower joint are fixed together through threaded connection. The lower inner side of the lower joint has threads and can be directly connected to the drill bit or the lower drill string to transmit the impact load. The guide plate is mounted on the lower end of the jet channel. The jet channel utilizes the principle of self-excited oscillation to modulate the inflowing continuous and stable fluid into a pulse jet with pressure fluctuation. The lower limit ring on the inner side of the lower end of the limit cylinder is used to limit the axial displacement amplitude of the guide plate. The torsion channel is arranged in the hammer. After the pulse jet passes through the torsion channel of the hammer, it drives the hammer to generate axial movement and torsion movement, thereby driving the lower joint and the drill bit connected to the lower joint to generate axial impact and torsion impact on the rock.

[0017] When in use, the oscillation impact drilling tool is connected to the drill string system for drilling, the upper end of the upper joint is connected to the upper drill string, the lower end of the lower joint is connected to the drill bit or the lower drill string, and after assembly, it is lowered into the target position in the well. After the lower end of the drill bit touches the formation, the drill bit, lower joint, anvil, transmission rod, hammer and guide plate move upward to the upper limit position (the upper end of the anvil contacts the lower end of the upper limit ring or the upper end of the hammer contacts the lower end of the core body), and then the drilling fluid enters the upper joint from the upper drill string, flows through the upper joint and enters the jet channel, and the pulse jet formed acts on the guide plate At the upper end of the disk, the pulse jet flows into the torsion channel through the jet outlet. After passing through the torsion channel, the pulse jet acts on the hammer, causing the hammer to move downward and rotate at the same time. In this way, the drill bit or the lower drill string can be driven to produce axial and torsional motion through the anvil and the lower joint, so that the static friction between the lower drill string and the well wall or between the drill bit and the rock can be eliminated, and the "support pressure" and "stick-slip" phenomena of the high friction well section are weakened. The energy transfer and conversion of the drill string system are more orderly, thereby achieving the purpose of reducing lateral vibration and torsional vibration and realizing efficient and safe drilling.

[0018] The oscillation impact drilling tool aims to solve the problem of severe drill string vibration in deep well and ultra-deep well drilling operations. It uses the hydraulic energy of the drilling fluid to modulate a high-frequency pulse jet to stimulate the lower drill string or drill bit to perform high-frequency axial impact and torsional impact, thereby changing the movement state of the lower drill string, making the energy transfer and conversion inside the drill string system more orderly and stable, and reducing or eliminating harmful vibrations such as "drill jumping", "stick-slip" and "vortex" that occur in deep well and ultra-deep well drilling operations, ultimately improving the safety and efficiency of drilling operations, saving drilling costs, and having broad application prospects. The oscillation impact drilling tool has the advantages of easy use, safety and reliability, and adjustable parameters. It is suitable for a variety of drilling platforms and has important practical significance for the safe and rapid drilling of deep wells and ultra-deep wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of embodiments one to seven of the present invention.

[0020] Attached Figure 2 For attachment Figure 1 Schematic diagram of the enlarged structure at AA in the middle.

[0021] Attached Figure 3 For attachment Figure 1 Schematic diagram of the enlarged structure at BB in the middle.

[0022] Attached Figure 4 For attachment Figure 1 Schematic diagram of the enlarged structure at CC in the middle.

[0023] Attached Figure 5 For attachment Figure 1 Schematic diagram of the enlarged structure at DD in the middle.

[0024] Attached Figure 6 For attachment Figure 1 Schematic diagram of the enlarged structure at EE in the middle.

[0025] The codes in the accompanying drawings are: 1 is an upper joint, 2 is a sleeve, 3 is a limit cylinder, 4 is a core body, 5 is a hammer, 6 is anvil, 7 is a lower limit ring, 8 is a guide plate, 9 is a support ring, 10 is a drive rod, 11 is an upper limit ring, 12 is a transmission rod, 13 is a jet outlet, 14 is a first tapered hole section, 15 is a first straight hole section, 16 is a first connector, 17 is a second tapered hole section, 18 is a second straight hole section, 19 is a second connector, 20 is a first guide groove, 21 is a second guide groove, 22 is a nozzle, 23 is a locking nut, 24 is an axial hole, 25 is a torsion hole, 26 is a lower joint, and 27 is an injection channel. DETAILED DESCRIPTION

[0026] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0027] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 The layout direction is determined by the

[0028] The present invention will be further described below in conjunction with embodiments and drawings:

[0029] Embodiment 1: As shown in the attached Figures 1 to 6As shown, the oscillation impact drilling tool comprises an upper joint 1, a sleeve 2, a limiting cylinder 3, a core body 4, a hammer 5 and anvil 6. The outer side of the lower part of the upper joint 1 is fixedly installed together with the inner side of the upper part of the sleeve 2. The lower inner side of the sleeve 2 is sleeved with a lower joint 26. The limiting cylinder 3 is fixedly installed in the sleeve 2 at a position between the lower end of the upper joint 1 and the upper end of the lower joint 26. The lower limiting ring platform 7 is fixedly installed on the inner side of the lower end of the limiting cylinder 3. The core body 4 is fixedly installed on the inner side of the upper part of the limiting cylinder 3. A jet channel that runs through from top to bottom and can generate pulse fluid is provided in the core body 4. A guide plate 8 is provided on the inner side of the lower end of the jet channel. An anvil 6 in the shape of a cone with a larger upper part and a smaller lower part is fixedly installed on the inner side of the upper part of the lower joint 26. The outer side of the upper end of the anvil 6 is fixedly installed A supporting ring platform 9 is fixedly installed on the upper end of the lower limit ring platform 7, a driving rod 10 with a hollow structure is fixedly installed on the upper end of the anvil 6, a hammer 5 mounted on the inner side of the lower part of the limit cylinder 3 is fixedly installed on the upper end of the driving rod 10, and a gap is provided between the upper end of the hammer 5 and the lower end of the core body 4, an upper limit ring platform 11 is fixed on the inner side of the lower part of the limit cylinder 3 corresponding to the lower side position of the hammer 5, a transmission rod 12 is installed between the hammer 5 and the guide plate 8, a plurality of jet outlets 13 that pass through the upper end of the guide plate 8 corresponding to the outer side of the transmission rod 12 are provided along the circumference at intervals, and a torsion channel is provided on the upper end of the hammer 5 corresponding to the outer side of the transmission rod 12, and the hammer 5 can be driven to rotate after the fluid flows through the torsion channel.

[0030] During use, the upper joint 1 is used to connect the upper drill string, the lower outer side of the anvil 6 and the upper inner side of the lower joint 26 are fixed together by threaded connection, the lower inner side of the lower joint 26 has threads, which can be directly connected to the drill bit or the lower drill string to transmit the impact load, the guide plate 8 is mounted on the lower end of the jet channel, and the jet channel utilizes the principle of self-excited oscillation to modulate the inflowing continuous and stable fluid into a pulse jet with pressure fluctuations, the lower limit ring 7 on the inner side of the lower end of the limit cylinder 3 is used to limit the axial displacement amplitude of the guide plate 8, and the torsion channel is set in the hammer 5. After the pulse jet passes through the torsion channel of the hammer 5, it drives the hammer 5 to produce axial movement and torsional movement, thereby driving the lower joint 26 and the drill bit connected to the lower joint 26 to produce axial impact and torsional impact on the rock.

[0031] When in use, the oscillation impact drilling tool is connected to the drill string system for drilling, the upper end of the upper joint 1 is connected to the upper drill string, the lower end of the lower joint 26 is connected to the drill bit or the lower drill string, and after assembly, it is lowered into the target position in the well. After the lower end of the drill bit touches the formation, the drill bit, the lower joint 26, the anvil 6, the transmission rod 12, the hammer 5 and the guide plate 8 move upward to the upper limit position (the upper end of the anvil 6 contacts the lower end of the upper limit ring 11 or the upper end of the hammer 5 contacts the lower end of the core 4), and then the drilling fluid enters the upper joint 1 from the upper drill string, flows through the upper joint 1 and enters the jet channel, forming a pulse jet It acts on the upper end of the guide plate 8, and at the same time, the pulse jet flows into the torsion channel through the jet outlet 13. After passing through the torsion channel, the pulse jet acts on the hammer 5, causing the hammer 5 to move downward and rotate at the same time. In this way, the drill bit or the lower drill string can be driven by the anvil 6 and the lower joint 26 to produce axial movement and torsional movement, so that the static friction between the lower drill string and the well wall or between the drill bit and the rock can be eliminated, the "support pressure" and "stick-slip" phenomena of the high friction well section are reduced, and the energy transfer and conversion of the drill string system are more orderly, thereby achieving the purpose of reducing lateral vibration and torsional vibration and realizing efficient and safe drilling.

[0032] The oscillation impact drilling tool aims to solve the problem of severe drill string vibration in deep well and ultra-deep well drilling operations. It uses the hydraulic energy of the drilling fluid to modulate a high-frequency pulse jet to stimulate the lower drill string or drill bit to perform high-frequency axial impact and torsional impact, thereby changing the movement state of the lower drill string, making the energy transfer and conversion inside the drill string system more orderly and stable, and reducing or eliminating harmful vibrations such as "drill jumping", "stick-slip" and "vortex" that occur in deep well and ultra-deep well drilling operations, ultimately improving the safety and efficiency of drilling operations, saving drilling costs, and having broad application prospects. The oscillation impact drilling tool has the advantages of easy use, safety and reliability, and adjustable parameters. It is suitable for a variety of drilling platforms and has important practical significance for the safe and rapid drilling of deep wells and ultra-deep wells.

[0033] The above-mentioned oscillation impact drilling tool can be further optimized and / or improved according to actual needs:

[0034] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in Figure 6, the jet channel includes an injection channel 27, a primary oscillation cavity and a secondary oscillation cavity. The core body 4 is provided with a closed primary oscillation cavity and a secondary oscillation cavity at upper and lower intervals. The upper end of the core body 4 corresponding to the lower end position of the upper joint 1 is provided with a jet channel 27 whose lower end is connected to the upper part of the primary oscillation cavity. The jet channel 27 is funnel-shaped with a larger upper part and a smaller lower part. A connecting through hole connecting the lower part of the primary oscillation cavity and the upper part of the secondary oscillation cavity is provided in the middle part of the core body 4. The lower end of the core body 4 is provided with a confluence channel whose upper end is connected to the lower part of the secondary oscillation cavity, and the guide plate 8 is mounted in the confluence channel.

[0035] According to the requirements, the injection channel 27 can also be a trumpet-shaped opening with a diameter that gradually decreases from top to bottom. The core body 4 can be arranged in sections, and the injection channel 27 and the primary oscillation cavity are arranged in the upper core body, and the secondary oscillation cavity is arranged in the lower core body, which can reduce the difficulty of processing. During use, the flow velocity of the fluid increases after passing through the injection channel 27, and then the high-speed fluid is sprayed into the primary oscillation cavity. After the oscillation, amplification and feedback of the primary oscillation cavity, a high-speed periodic self-excited oscillation pulse jet is formed at the upper end of the connecting through hole, and after passing through the connecting through hole, it enters the secondary oscillation cavity, and again after the oscillation, amplification and feedback of the secondary oscillation cavity, it is accelerated and ejected from the jet outlet 13 of the guide plate 8 to form a pulse jet with a larger amplitude and peak value.

[0036] The primary oscillation cavity and the secondary oscillation cavity can also be existing well-known self-excited oscillation cavities or diffusion cavities. The primary oscillation cavity and the secondary oscillation cavity produce oscillation, amplification and feedback effects on the fluid, so that the fluid forms a series of discrete vortex rings and becomes a pulsating fluid wave.

[0037] The pulse jet finally formed acts on the upper end of the guide plate 8, and at the same time, the pulse jet flows into the torsion channel through the jet outlet 13. After passing through the torsion channel, the pulse jet acts on the hammer 5, causing the hammer 5 to move downward and rotate at the same time, so that the drill bit or the lower drill string can be driven to produce axial movement and torsional movement through the anvil 6 and the lower joint 26.

[0038] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 6 As shown, the primary oscillation cavity includes a first conical hole section 14 and a first straight hole section 15 which are connected in sequence from top to bottom. The first conical hole section 14 is in the shape of a cone with a small top and a large bottom. A first truncated cone-shaped connector 16 with a small top and a large bottom is fixed to the lower part of the first straight hole section 15, and the upper end of the connecting through hole extends to the upper end of the first connector 16. The secondary oscillation cavity includes a second conical hole section 17 and a second straight hole section 18 which are connected in sequence from top to bottom. The second conical hole section 17 is in the shape of a cone with a small top and a large bottom. A second truncated cone-shaped connector 19 with a small top and a large bottom is fixed to the lower part of the second straight hole section 18, and the upper end of the confluence channel extends to the upper end of the second connector 19.

[0039] The lower end of the injection channel 27 is connected to the upper end of the first tapered hole section 14. The primary oscillation chamber and the secondary oscillation chamber utilize the principle of self-excited oscillation to modulate the continuous and stable fluid flowing into the chamber into a pulse jet with fluctuating pressure. After passing through the connecting through hole, the fluid enters the secondary oscillation chamber, and is again oscillated, amplified and fed back by the secondary oscillation chamber. The fluid is then accelerated and ejected from the jet outlet 13 of the guide plate 8 to form a pulse jet with a larger amplitude and peak value, thereby overcoming the disadvantage of the existing continuous jet having low continuous energy, improving the instantaneous impact force of the jet, and improving the effective injection distance and the instantaneous hydraulic energy of the jet when it reaches the bottom of the well.

[0040] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 6 As shown, a plurality of first guide grooves 20 opening inwards are distributed along the circumference on the inner wall of the upper end of the first tapered hole section 14, and the plurality of first guide grooves 20 opening inwards all extend along the spiral direction to the lower end of the first straight hole section 15. A plurality of second guide grooves 21 opening inwards are distributed along the circumference on the inner wall of the upper end of the second tapered hole section 17, and the plurality of second guide grooves 21 opening inwards all extend along the spiral direction to the lower end of the second straight hole section 18.

[0041] According to the requirements, the cross-sections of the first guide groove 20 and the second guide groove 21 are both rectangular. The primary oscillation cavity and the secondary oscillation cavity can modulate the continuous stable fluid flowing into the chamber into a pulse jet with pressure fluctuations by using the principle of self-excited oscillation. The first guide groove 20 and the second guide groove 21 can adjust the frequency and amplitude of the oscillation impact load. Increasing the number of the first guide groove 20 and the second guide groove 21 can effectively increase the number of vortexes generated, thereby increasing the amplitude of the self-excited oscillation pulse jet. Increasing the flow channel depth of the first guide groove 20 and the second guide groove 21 can reduce the natural frequency of the self-excited oscillation cavity itself, reduce the frequency of the self-excited oscillation pulse jet, and thus achieve the purpose of modulating the frequency and amplitude of the pulse jet.

[0042] When this embodiment is working, the self-excited oscillating pulse jet increases the peak pressure of the injection pulse by relying on the chamber structure, and the frequency and amplitude of the jet can also be affected by adjusting the chamber structure and the parameters (flow rate and flow velocity) of the incoming fluid.

[0043] After passing through the upper joint 1, the drilling fluid enters the primary oscillation chamber, and the fluid periodically forms vortices and cavitation bubbles in the primary oscillation chamber. These vortices and cavitation bubbles hinder the inlet flow velocity, resulting in a flow velocity at the lower end of the oscillation chamber being greater than that at the upper end of the oscillation chamber. In the primary oscillation chamber, a vortex disturbance wave is generated when the jet passes through, and is amplified in the unstable shear layer. After hitting the inner wall of the primary oscillation chamber (the inner wall of the first tapered hole section 14 and the outer wall of the first connector 16), it is effectively reflected and interacts with the jet, resulting in periodic changes in fluid impedance and forming pressure pulses. These pressure pulses cause the fluid to generate self-excited oscillations in the flow, thereby forming a pulse jet with frequency and intensity at the upper end of the nozzle 22.

[0044] After the self-excited oscillation process of resonance, feedback, frequency selection and amplification, a pulse jet with periodic pressure fluctuation is formed. The pulse jet enters the secondary oscillation cavity, and after the self-excited oscillation process of secondary resonance, feedback, frequency selection and amplification, a pulse jet with higher periodic pressure fluctuation is formed, and enters the torsional channel of the hammer 5, driving the hammer 5 to produce periodic axial movement and torsional movement. The hammer 5 drives the drive rod 10 to move, and the drive rod 10 transmits the axial impact load and the torsional impact load to the anvil 6, so that the anvil 6 produces high-frequency axial vibration and torsional vibration, thereby driving the lower joint 26 and the lower drill string or drill bit connected to the lower joint 26, so as to achieve the effect of adjusting the movement state of the lower drill string or drill bit.

[0045] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, a nozzle 22 is provided in the connecting through hole, and locking nuts 23 are fixedly installed in the connecting through holes corresponding to the upper and lower ends of the nozzle 22.

[0046] According to the requirements, the nozzle 22 is an existing well-known technology. The primary oscillation chamber and the secondary oscillation chamber are connected by the nozzle 22. The nozzle 22 is set so that the flow velocity of the fluid increases after passing through the injection channel 27, and then the high-speed fluid is sprayed into the primary oscillation chamber. After the oscillation, amplification and feedback of the primary oscillation chamber, a high-speed periodic self-excited oscillation pulse jet is formed at the upper end of the nozzle 22. After being accelerated by the nozzle 22, it enters the secondary oscillation chamber, and again undergoes the oscillation, amplification and feedback of the secondary oscillation chamber, and is accelerated and ejected from the jet outlet 13 of the guide plate 8 to form a pulse jet with a larger amplitude and peak value.

[0047] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in 3, a lower mounting hole is provided in the center of the upper end of the hammer 5 and passes through from top to bottom. An upper mounting hole is provided in the center of the guide plate 8 corresponding to the position of the lower mounting hole. The cross-sections of the upper mounting hole and the lower mounting hole are both polygonal. The cross-section of the transmission rod 12 matches the cross-section of the lower mounting hole. The outer upper portion of the transmission rod 12 is fixedly installed in the upper mounting hole, and the lower end of the transmission rod 12 is fixedly installed in the lower mounting hole.

[0048] The guide plate 8 is mounted on the lower part of the secondary oscillation chamber. The matching parts of the anvil 6 and the lower end of the sleeve 2 are hexagonal structures for transmitting torque. The lower end of the anvil 6 passes through the lower end of the sleeve 2 and is threadedly connected to the lower joint 26. The inner side of the lower joint 26 has threads and can be directly connected to the drill bit or the lower drill string to transmit impact loads.

[0049] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown in Figure 3, the torsion channel includes an axial hole 24 and a torsion hole 25. The lower end of the hammer 5 corresponding to the position between the inner side of the driving rod 10 and the outer side of the transmission rod 12 is provided with an axial hole 24 that passes through from top to bottom. The middle part of the axial hole 24 is provided with a torsion hole 25 whose end extends to the outer side of the hammer 5. The torsion hole 25 is arranged in a vortex shape.

[0050] According to the requirements, the central axis of the axial hole 24 is inclined from top to bottom and from inside to outside. When in use, the oscillation impact drilling tool is connected to the drill string system for drilling, the upper end of the upper joint 1 is connected to the upper drill string, and the lower end of the lower joint 26 is connected to the drill bit or the lower drill string. After assembly, it is lowered into the target position in the well. After the lower end of the drill bit is against the formation, the drill bit, the lower joint 26, the anvil 6, the transmission rod 12, the hammer 5 and the guide plate 8 move upward to the upper limit position (the upper end of the anvil 6 contacts the lower end of the upper limit ring 11 or the upper end of the hammer 5 contacts the lower end of the core 4), and then the drilling fluid enters the upper joint 1 from the upper drill string, flows through the upper joint 1, and enters the primary oscillation cavity and the secondary oscillation cavity, and successively undergoes the self-excited oscillation process of resonance, feedback, frequency selection and amplification to form a pulse jet with periodic pressure fluctuations. The pulse jet passes through the guide plate 8 and enters the axial hole 24 and the torsional hole 25 of the hammer 5, causing the hammer 5 to generate axial The impact and torsional impact drive the anvil 6, the lower joint 26 and the lower drill string or the drill bit to produce periodic axial movement and torsional movement. The drill bit produces downward movement and rotation and then acts on the rock, forming an impact effect on the rock. When the flow rate of the pulse jet decreases, the rock reacts on the drill bit. At the same time, under the action of gravity, the sleeve 2 causes the drill bit, the lower joint 26, the anvil 6, the transmission rod 12, the hammer 5 and the guide plate 8 to move upward to the upper limit relative to the sleeve 2 again, and so on. The pulse jet periodically acts on the drill bit or the lower drill string, so that the static friction between the lower drill string and the well wall or between the drill bit and the rock is eliminated, and the "support pressure" and "stick-slip" phenomena of the high friction well section are weakened. The energy transfer and conversion of the drill string system are more orderly, thereby achieving the purpose of reducing lateral vibration and torsional vibration, and realizing efficient and safe drilling.

[0051] Compared with the prior art, the present invention aims at the severe drill string vibration problem occurring in deep well and ultra-deep well drilling operations, utilizes axial impact load and torsional impact load to adjust the movement state of the lower drill string, so that the transmission and conversion of energy inside the drill string system are more orderly, and the vibration of the lower drill string can be effectively suppressed. It has the characteristics of being effective and controllable, and also has broad application prospects, is suitable for various well types and various drilling platforms, has low processing and manufacturing cost and difficulty, and low use and maintenance cost, and effectively solves the severe drill string vibration problem occurring in deep well and ultra-deep well drilling operations, and has important practical significance for improving drilling efficiency and safety and reducing production costs.

[0052] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and optimal implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. An oscillating impact drilling tool, characterized in that The invention comprises an upper joint, a sleeve, a limiting cylinder, a core body, a hammer and an anvil. The outer side of the lower part of the upper joint is fixedly installed together with the inner side of the upper part of the sleeve. The lower part of the sleeve is sleeved with a lower joint. The limiting cylinder is fixedly installed in the sleeve corresponding to the position between the lower end of the upper joint and the upper end of the lower joint. The lower end of the limiting cylinder is fixedly provided with a lower limiting ring. The inner side of the upper part of the limiting cylinder is fixedly provided with a core body. A jet channel which runs through from top to bottom and can generate pulse fluid is provided in the core body. A guide plate is provided on the inner side of the lower end of the jet channel. A conical anvil which is larger at the top and smaller at the bottom is fixedly installed on the inner side of the upper part of the lower joint. A supporting ring platform is seated on the upper end of the lower limit ring platform, a driving rod with a hollow structure is fixedly installed on the upper end of the anvil, a hammer mounted on the inner side of the lower part of the limit cylinder is fixedly installed on the upper end of the driving rod, a spacing is provided between the upper end of the hammer and the lower end of the core body, an upper limit ring platform is fixed on the inner side of the lower part of the limit cylinder corresponding to the lower side position of the hammer, a transmission rod is installed between the hammer and the guide plate, a plurality of jet outlets that pass through the upper end of the guide plate corresponding to the outer side position of the transmission rod are arranged at intervals along the circumference, and a torsion channel is provided on the upper end of the hammer corresponding to the outer side position of the transmission rod, and the hammer can be driven to rotate after the fluid flows through the torsion channel; A lower mounting hole is provided in the center of the upper end of the punch hammer, and an upper mounting hole is provided in the center of the guide plate corresponding to the position of the lower mounting hole, and the cross-sections of the upper mounting hole and the lower mounting hole are both polygonal, and the cross-section of the transmission rod matches the cross-section of the lower mounting hole. The outer side of the upper part of the transmission rod is fixedly installed in the upper mounting hole, and the lower end of the transmission rod is fixedly installed in the lower mounting hole. The torsion channel includes an axial hole and a torsion hole. An axial hole that passes through the hammer from top to bottom is provided at the lower end of the hammer corresponding to the position between the inner side of the driving rod and the outer side of the transmission rod. A torsion hole whose end extends to the outer side of the hammer is provided in the middle of the axial hole. The torsion hole is arranged in a vortex shape.

2. The oscillation percussion drilling tool according to claim 1, characterized in that The jet channel includes an injection channel, a primary oscillation cavity and a secondary oscillation cavity. A closed primary oscillation cavity and a secondary oscillation cavity are provided at upper and lower intervals in the core body. The upper end of the core body corresponding to the lower end position of the upper joint is provided with a injection channel whose lower end is connected with the upper part of the primary oscillation cavity. The injection channel is funnel-shaped with a larger upper part and a smaller lower part. A connecting through hole connecting the lower part of the primary oscillation cavity and the upper part of the secondary oscillation cavity is provided in the middle part of the core body. A confluence channel whose upper end is connected with the lower part of the secondary oscillation cavity is provided at the lower end of the core body, and the guide plate is mounted in the confluence channel.

3. The oscillation percussion drilling tool according to claim 2, characterized in that The primary oscillation cavity includes a first conical hole section and a first straight hole section which are connected in sequence from top to bottom. The first conical hole section is in the shape of a cone which is small at the top and large at the bottom. A first truncated cone-shaped connector which is small at the top and large at the bottom is fixed at the lower part of the first straight hole section. The upper end of the connecting through hole extends to the upper end of the first connector. The secondary oscillation cavity includes a second conical hole section and a second straight hole section which are connected in sequence from top to bottom. The second conical hole section is in the shape of a cone which is small at the top and large at the bottom. A second truncated cone-shaped connector which is small at the top and large at the bottom is fixed at the lower part of the second straight hole section. The upper end of the confluence channel extends to the upper end of the second connector.

4. The oscillation percussion drilling tool according to claim 3, characterized in that A plurality of first guide grooves opening inward are distributed along the circumference on the inner wall of the upper end of the first tapered hole section, and the plurality of first guide grooves opening inward are extended along the spiral direction to the lower end of the first straight hole section. A plurality of second guide grooves opening inward are distributed along the circumference on the inner wall of the upper end of the second tapered hole section, and the plurality of second guide grooves opening inward are extended along the spiral direction to the lower end of the second straight hole section.

5. The oscillation percussion drilling tool according to claim 2, 3 or 4, characterized in that A nozzle is arranged in the connecting through hole, and locking nuts are fixedly installed in the connecting through holes corresponding to the upper end and the lower end of the nozzle.

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