A hydraulically driven casing head

Abstract

The present application relates to the technical field of casing string processing in a well, and provides a hydraulically driven casing head, including a connecting tube, a steering head and a driving assembly, wherein one end of the connecting tube is connected to the steering head, and the other end is used to connect to the casing, the steering head is connected to a rotating shaft, the rotating shaft is rotatably connected to the connecting tube, and the steering head is rotatably installed on the connecting tube through the rotating shaft; the driving assembly is arranged between the connecting tube and the rotating shaft to drive the rotating shaft to rotate, and the driving assembly is arranged in multiple groups along the axial direction of the rotating shaft; the driving assembly includes a guide plate arranged on the connecting tube and a driving impeller arranged on the rotating shaft, the driving impeller is located on the side of the guide plate close to the steering head, and the guide plate is provided with a spiral flow channel, and the flow channel gradually decreases from the end away from the driving impeller to the end close to the driving impeller. A hydraulically driven casing head of the present application can improve the steering power of the casing head.

Description

Technical Field

[0001] The present application relates to the technical field of casing string processing in a well, and in particular to a hydraulically driven casing head. Background Art

[0002] As the domestic demand for oil and gas resources continues to grow, oil and gas extraction activities are increasingly inclined to adopt technologies with large displacement and complex wellbore trajectories. Although this type of wellbore design can increase oil and gas production, in actual operation, it often faces many difficulties in casing lowering operations due to complex formation conditions and long open hole sections, posing a major challenge to the smooth construction of oil and gas wells.

[0003] In the prior art, in order to effectively deal with these challenges, a hydraulically driven power casing head is usually used. The casing head has a flow channel for the flow of drilling fluid. The flow channel is spiral. The drilling fluid is rushed into the casing head through the casing. When the drilling fluid passes through the flow channel of the casing head, it provides steering power for the casing head to help it smoothly pass through the complex formation structure. However, in this type of well entry method, when the wellbore reaches a certain depth, as the wellbore depth increases, the power of the drilling fluid on the casing head gradually weakens, so that when the casing head reaches a certain depth in the well, the steering power of the casing head is insufficient and it is difficult to continue to be lowered smoothly, so further improvement is needed. Summary of the invention

[0004] In order to improve the steering power of the casing head, the present application provides a hydraulically driven casing head.

[0005] The hydraulically driven casing head provided in this application adopts the following technical solution:

[0006] A hydraulically driven casing head comprises a connecting cylinder, a steering head and a driving assembly, wherein one end of the connecting cylinder is connected to the steering head, and the other end is used to connect to the casing, the steering head is used to grind the inner wall of the wellbore, the steering head is connected to a rotating shaft, the rotating shaft is rotatably connected to the connecting cylinder, and the steering head is rotatably installed on the connecting cylinder through the rotating shaft; the driving assembly is arranged between the connecting cylinder and the rotating shaft to drive the rotating shaft to rotate, and the driving assembly is provided with multiple groups along the axial direction of the rotating shaft; the driving assembly comprises a guide plate arranged on the connecting cylinder and a driving impeller arranged on the rotating shaft, the driving impeller is located on the side of the guide plate close to the steering head, the guide plate is provided with a spiral flow channel, and the flow channel gradually decreases from the end away from the driving impeller to the end close to the driving impeller.

[0007] By adopting the above technical solution, the connecting tube is placed in the wellbore and lowered through the arrangement of the guide plate and the driving impeller. When the steering head contacts the obstruction protruding from the inner wall of the wellbore, the drilling fluid is rushed into the connecting tube through the casing. The drilling fluid impacts the driving impeller after passing through the flow channel of the guide plate, thereby driving the rotating shaft to rotate, so that the steering head can rotate to grind and trim the obstruction on the inner wall of the wellbore, so that when the casing is stuck, the position of the wellbore blockage can be unblocked smoothly, so as to achieve the purpose of smoothly entering the wellbore. The flow channel is spiral, and the flow channel opening gradually decreases from the end away from the driving impeller to the end close to the driving impeller, so that the drilling fluid can form a spiral shape when passing through the flow channel and increase the flow rate of the drilling fluid, which has the effect of pressurization, thereby increasing the steering power of the steering head; by setting multiple sets of drive components, the guide plates in the multiple sets of drive components can have the effect of multi-stage pressurization, thereby enabling the steering head to have sufficient steering power.

[0008] Optionally, the steering head includes a rotating sleeve and a guide head, one end of the rotating sleeve is rotatably connected to the connecting tube, and the other end is connected to the guide head, the rotating shaft is arranged on the rotating sleeve, and the outer peripheral wall of the rotating sleeve is provided with a plurality of alloy grinding drill blocks for grinding the inner wall of the wellbore; the guide head is used to guide the rotating sleeve into the well, and the outer diameter of the guide head gradually decreases from one end close to the rotating sleeve to one end away from the rotating sleeve.

[0009] By adopting the above technical solution, through the arrangement of the rotating sleeve and the guide head, the guide head is used to guide the rotating sleeve into the well. When there is an obstacle on the inner wall of the wellbore blocking the travel route, drilling fluid is flushed into the connecting tube to drive the rotating shaft to rotate, thereby driving the rotating sleeve to rotate. The alloy grinding drill block of the rotating sleeve can grind the obstacle on the inner wall of the wellbore, so that the casing can be lowered smoothly.

[0010] Optionally, the rotating sleeve and the guide head are threadedly connected, and the direction of the thread between the rotating sleeve and the guide head is opposite to the rotation direction of the rotating sleeve.

[0011] By adopting the above technical solution, when the rotating sleeve rotates to grind the obstacles on the inner wall of the wellbore, the rotating sleeve and the guide head can be tightened, thereby improving the stability of the connection between the rotating sleeve and the guide head.

[0012] Optionally, the outer wall of the connecting tube is slidably installed with a plurality of abutment arc bars for abutting the inner wall of the wellbore, and the plurality of abutment arc bars are arranged at intervals around the central axis of the connecting tube; the connecting tube is provided with a pushing assembly, and when drilling fluid is transported into the connecting tube, the pushing assembly drives the abutment arc bars to abut the inner wall of the wellbore.

[0013] By adopting the above-mentioned technical scheme and setting the abutment arc strips, when the rotating sleeve is lowered into the wellbore and encounters an obstacle, drilling fluid is injected into the connecting tube to force the rotating sleeve to rotate so as to grind the obstacle; when the rotating sleeve rotates, the pushing component can drive multiple abutment arc strips to abut against the inner wall of the wellbore, playing the role of limiting the connecting tube, thereby reducing the situation in which the alloy grinding drill block collides with the obstacle during the grinding of the rotating sleeve and causes the rotating sleeve to shake, so that the alloy grinding drill block can better act on the obstacle, thereby improving the grinding effect of the rotating sleeve on the obstacle.

[0014] The cam is configured to move the sliding member to the first position relative to the sliding member, and the sliding member is configured to move the sliding member to the second position relative to the sliding member.

[0015] By adopting the above-mentioned technical scheme, through the setting of the sliding seat, the sliding block and the pushing member, under normal conditions, the sliding block moves to the first point position, so that there is a gap between the abutting arc strip and the inner wall of the wellbore, reducing the contact area between the overall structure and the inner wall of the wellbore, so as to facilitate the smooth entry of the connecting tube into the well; when encountering an obstacle, drilling fluid is injected into the connecting tube to drive the rotating shaft (i.e., the rotating sleeve) to rotate, so that the rotating sleeve grinds the obstacle, and when the drilling fluid is sent into the connecting tube, the pushing member can force the sliding seat to slide, thereby moving the sliding block to the second point position, and the sliding block drives the abutting arc strip to move through the sliding rod, forcing the abutting arc strip to abut against the inner wall of the wellbore, so as to play the effect of limiting the connecting tube, thereby greatly improving the grinding effect of the rotating sleeve on the obstacle.

[0016] Optionally, the pushing member includes a pushing plate and a first spring, the pushing plate is slidably installed in the connecting tube and connected to the sliding seat, and the pushing plate is located on the side of the driving impeller away from the guide plate for providing drilling fluid impact; the first spring is arranged between the sliding seat and the connecting tube, and the first spring normally causes the sliding seat to move toward the side away from the steering head so that the sliding block moves to the first point position.

[0017] By adopting the above technical solution, through the setting of the push plate and the first spring, the drilling fluid rushes into the connecting tube to drive the rotating sleeve to rotate and then impact the push plate, driving the push plate to move, thereby driving the sliding seat to move, so that the sliding block moves from the first point to the second point, and then the abutting arc bar abuts against the inner wall of the wellbore, improving the convenience of the connection tube limit operation. On the other hand, the push plate is set on the side of the driving impeller away from the guide plate, that is, the drilling fluid at this time has completed the driving effect on the rotating sleeve, and the movement of the push plate is carried out by using the residual pressure of the drilling fluid, avoiding the movement of the push plate to consume the steering power of the rotating sleeve, greatly improving the grinding effect of the overall structure on obstacles.

[0018] Optionally, a lifting groove is provided on the inner arc surface of the abutting arc bar, a lifting block is slidably installed in the lifting groove, one end of the sliding rod penetrates into the lifting groove and is connected to the lifting block; a second spring is provided between the inner wall of the lifting groove and the lifting block, and the second spring normally causes the lifting block to move to the middle position of the lifting groove.

[0019] By adopting the above-mentioned technical solution, through the setting of the lifting block and the second spring, after the abutting arc bar abuts against the inner wall of the wellbore, the connecting tube can be limited, thereby reducing the jitter amplitude of the rotating sleeve during the rotation and grinding process; the cooperation of the lifting block and the lifting groove enables the connecting tube to be limited by the abutting arc bar, and still be able to move within a certain range (the length of the lifting groove) along its own central axis, so that the rotating sleeve can move up and down, and better grind the obstacles.

[0020] Optionally, a sliding rod is slidably installed in the connecting cylinder, one end of the sliding rod passes through the connecting cylinder and is connected to an abutting arc bar, and the abutting arc bar is slidably installed in the connecting cylinder through the sliding rod; the pushing assembly includes a pushing disk, a mounting block, a pushing block and a pushing member, the pushing disk is rotatably installed in the connecting cylinder and is coaxially arranged with the rotating shaft, the outer peripheral wall of the pushing disk is provided with a mounting ring groove, the mounting block is arranged in the mounting ring groove, one end of the sliding rod away from the abutting arc bar extends into the mounting ring groove and is connected to the mounting block; the pushing block is arranged on the inner wall of the mounting ring groove, and a plurality of pushing blocks are arranged at intervals around the central axis of the pushing disk, each of the pushing blocks has a pushing surface for pushing the mounting block; the pushing member is arranged on the pushing disk, and when drilling fluid is transported into the connecting cylinder, the pushing member drives the pushing disk to rotate around its own central axis.

[0021] By adopting the above-mentioned technical scheme, through the arrangement of the pushing plate, the mounting block, the pushing block and the pushing member, when the drilling fluid rushes into the connecting tube to drive the rotating sleeve to rotate to grind the obstacle, the pushing member drives the pushing plate to rotate, and the pushing block of the pushing plate can push the mounting block, so that the abutting arc bar abuts against the inner wall of the wellbore. As the rotating sleeve continues to rotate (that is, the drilling fluid continues to rush in), the pushing plate can intermittently push the abutting arc bar, so that the abutting arc bar intermittently abuts against the inner wall of the wellbore; on the one hand, when the abutting arc bar abuts against the inner wall of the wellbore, the jitter of the rotating sleeve in the process of grinding the obstacle can be reduced. On the other hand, the abutting arc bar intermittently abuts against the inner wall of the wellbore (that is, the abutting arc bar intermittently detaches from the inner wall of the wellbore), avoiding direct "locking" between the connecting tube and the inner wall of the wellbore, providing a certain degree of shaking space for the rotating sleeve, and reducing the situation where the rotating sleeve is unable to shake (that is, unable to unload force) when encountering hard obstacles, resulting in a head-on collision between the alloy grinding drill block and the hard obstacle, thereby reducing the possibility of damage to the alloy grinding drill block due to violent impact with the hard obstacle.

[0022] Optionally, there is a sealing gap between the outer circumferential wall of the guide plate and the inner circumferential wall of the connecting tube, and a first sealing ring is arranged in the sealing gap; a sliding ring is slidably installed in the connecting tube, and the sliding ring is located on the side of the guide plate away from the driving impeller, the sliding ring and the connecting tube are coaxially arranged, and the outer circumferential wall of the sliding ring is in contact with the inner circumferential wall of the connecting tube; the connecting tube is provided with a clamping piece, and when drilling fluid is transported into the connecting tube, the clamping piece drives the sliding ring to move downward and seals the upper opening of the sealing gap.

[0023] By adopting the above-mentioned technical scheme, through the arrangement of the first sealing ring and the sliding ring, the first sealing ring is arranged in the sealing gap to improve the sealing performance of the guide plate, so as to allow the drilling fluid to pass along the flow channel as much as possible, and reduce the possibility of leakage of the drilling fluid between the outer peripheral wall of the guide plate and the inner peripheral wall of the connecting tube; when encountering an obstacle and rushing drilling fluid into the connecting tube, the abutting arc strip abuts against the inner wall of the wellbore under the action of the drilling fluid to reduce the shaking amplitude of the connecting tube. At this time, the abutting member can drive the sliding ring to move downward and seal the upper end opening of the sealing gap, thereby further improving the sealing effect of the sealing gap.

[0024] Optionally, the inner diameter of the inner circumferential wall of the sliding ring gradually decreases from the end away from the guide plate to the end close to the guide plate to form a guide surface, and the inner diameter of the end of the sliding ring close to the guide plate is smaller than the outer diameter of the guide plate; the clamping member includes a clamping column arranged on the sliding rod, and when the sliding rod drives the abutting arc bar to abut against the inner circumferential wall of the wellbore, the clamping column pushes the guide surface and forces the sliding ring to seal the upper end opening of the sealing gap.

[0025] By adopting the above-mentioned technical scheme, through the arrangement of the clamping column and the guide surface, on the one hand, after the drilling fluid rushes into the connecting tube, the guide surface can guide the drilling fluid, so that the drilling fluid is guided toward the flow channel as much as possible, thereby reducing the possibility of the drilling fluid entering the sealing gap; on the other hand, after the drilling fluid rushes into the connecting tube, the sliding rod is displaced under the action of the drilling fluid, driving the clamping column to push the guide surface, forcing the sliding ring to seal the upper end opening of the sealing gap, thereby further improving the sealing performance of the sealing gap.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Through the arrangement of the guide plate and the driving impeller, the connecting tube is placed in the wellbore and lowered. When the steering head contacts an obstacle protruding from the inner wall of the wellbore, drilling fluid is rushed into the connecting tube through the casing. The drilling fluid passes through the flow channel of the guide plate and impacts the driving impeller, thereby driving the rotating shaft to rotate, so that the steering head can rotate to grind and trim the obstacles on the inner wall of the wellbore, so that when the casing is stuck, the position where the wellbore is blocked can be unblocked smoothly, so as to achieve the purpose of smoothly entering the casing into the well. The flow channel is spiral, and the opening of the flow channel gradually decreases from the end away from the driving impeller to the end close to the driving impeller, so that the drilling fluid can form a spiral when passing through the flow channel and increase the flow rate of the drilling fluid, which has a pressurization effect, thereby increasing the steering power of the steering head; by setting up multiple sets of drive components, the guide plates in the multiple sets of drive components can have a multi-stage pressurization effect, so that the steering head has sufficient steering power;

[0028] 2. Through the setting of the abutment arc strips, when the rotating sleeve is lowered into the wellbore and encounters an obstacle, drilling fluid is injected into the connecting tube to force the rotating sleeve to rotate so as to grind the obstacle; during the rotation of the rotating sleeve, the pushing component can drive multiple abutment arc strips to abut against the inner wall of the wellbore, playing the role of limiting the connecting tube, reducing the situation in which the alloy grinding drill block collides with the obstacle during the grinding of the rotating sleeve on the obstacle and causing the rotating sleeve to shake, so that the alloy grinding drill block can better act on the obstacle, thereby improving the grinding effect of the rotating sleeve on the obstacle;

[0029] 3. Through the setting of the push plate and the first spring, the drilling fluid rushes into the connecting tube to drive the rotating sleeve to rotate and then impact the push plate, driving the push plate to move, thereby driving the sliding seat to move, so that the sliding block moves from the first point to the second point, and then the abutting arc bar abuts against the inner wall of the wellbore, improving the convenience of the connection tube limit operation. On the other hand, the push plate is set on the side of the driving impeller away from the guide plate, that is, the drilling fluid has completed the driving effect on the rotating sleeve at this time, and the movement of the push plate is carried out by using the residual pressure of the drilling fluid, avoiding the movement of the push plate to consume the steering power of the rotating sleeve, greatly improving the grinding effect of the overall structure on obstacles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of Example 1;

[0031] Figure 2 is a partial cross-sectional view of the drive assembly of embodiment 1;

[0032] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0033] Figure 4 is a schematic diagram of the structure of the flow channel of Example 1;

[0034] Figure 5 is a schematic structural diagram of the flow channel in another direction of Embodiment 1;

[0035] Figure 6 is a partial cross-sectional view of the abutting arc strip embodied in Embodiment 2;

[0036] Figure 7 is a partial cross-sectional view of the push assembly of embodiment 2;

[0037] Figure 8 yes Figure 7 The enlarged view of point B in the middle;

[0038] Fig. 9 is a partial cross-sectional view of a drive assembly according to Embodiment 3;

[0039] Fig.10 It is a partial cross-sectional view of the sliding ring according to the fourth embodiment.

[0040] Description of reference numerals: 1. Connecting cylinder; 11. Abutting arc strip; 111. Lifting groove; 112. Lifting block; 113. Second spring; 12. Sliding rod; 121. Tightening column; 13. Sealing gap; 14. First sealing ring; 15. Sliding ring; 151. Guide surface; 152. Embedding groove; 153. Second sealing ring; 16. Connecting part; 17. Mounting bolt; 18. Storage groove; 2. Steering head; 21. Rotating sleeve; 211. Alloy grinding drill block; 22. Guide head; 221. Drain hole; 222. Drain groove; 3. Driving assembly; 31. Guide plate; 311. Flow channel; 312, first through hole; 313, mounting hole; 314, cover plate; 315, docking ring; 32, driving impeller; 321, limiting ring; 4, rotating shaft; 41, second through hole; 5, pushing assembly; 51, sliding seat; 511, sliding groove; 512, first point; 513, second point; 514, guide cone block; 515, guide surface; 52, sliding block; 53, pushing plate; 531, connecting rod; 54, first spring; 55, pushing plate; 551, mounting ring groove; 552, synchronous shaft; 56, mounting block; 57, pushing block; 571, pushing surface. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1 -Attached Fig.10 This application is described in further detail. Example 1

[0042] The embodiment of the present application discloses a hydraulically driven casing head.

[0043] Reference Figure 1 , Figure 2 A hydraulically driven casing head comprises a connecting tube 1, a steering head 2 and a driving assembly 3. In this embodiment, the connecting tube 1 and the steering head 2 are both configured as cylindrical structures, one end of the connecting tube 1 is connected to the steering head 2, and the other end is used to connect to the casing to guide the casing into the excavated wellbore.

[0044] Reference Figure 1 , Figure 2 The steering head 2 is used for grinding the inner wall of the wellbore to remove obstacles protruding from the inner wall of the wellbore; in this embodiment, the steering head 2 includes a rotating sleeve 21 and a guide head 22, and the end of the connecting tube 1 away from the casing (i.e., the lower end of the connecting tube 1) is integrally formed with a connecting portion 16, and the outer diameter of the connecting portion 16 is larger than the outer diameter of the connecting tube 1, and the rotating sleeve 21 is rotatably installed on the inner circumferential wall of the connecting portion 16, and the rotating sleeve 21 is rotatably installed on the connecting tube 1 through the connecting portion 16 so as to be able to rotate around its own central axis.

[0045] The guide head 22 is used to guide the rotating sleeve 21 into the well, and the guide head 22 is installed at one end of the rotating sleeve 21 away from the connecting tube 1; in this embodiment, the rotating sleeve 21 and the guide head 22 are threadedly connected (the thread is not shown in the figure), and the thread rotation direction between the rotating sleeve 21 and the guide head 22 is set opposite to the rotation direction of the rotating sleeve 21; the outer peripheral wall of the rotating sleeve 21 is fixedly mounted with a plurality of alloy grinding drill blocks 211 for grinding the inner wall of the wellbore, and the plurality of alloy grinding drill blocks 211 are arranged at intervals around the central axis of the rotating sleeve 21; the outer diameter of the guide head 22 gradually decreases from one end close to the rotating sleeve 21 to the end away from the rotating sleeve 21 to form a cone, and the outer peripheral wall of the guide head 22 is provided with a drainage hole 221 for discharging drilling fluid, and the drainage hole 221 is connected to the inside of the guide head 22 and is connected to the inside of the rotating sleeve 21; the outer peripheral wall of the guide head 22 is provided with a drainage groove 222, and a plurality of drainage grooves 222 are arranged at intervals around the central axis of the guide head 22.

[0046] Reference Figure 2The rotating sleeve 21 is provided with a rotating shaft 4, one end of the rotating shaft 4 is located in the rotating sleeve 21, and the other end extends into the connecting cylinder 1. The rotating shaft 4 and the connecting cylinder 1 are coaxially arranged, and the rotating shaft 4 and the connecting cylinder 1 are rotationally connected. The rotating sleeve 21 is rotatably installed on the connecting cylinder 1 through the rotating shaft 4; the driving assembly 3 is arranged between the connecting cylinder 1 and the rotating shaft 4 to drive the rotating shaft 4 to rotate around its own central axis. In this embodiment, a plurality of driving assemblies 3 are arranged along the axial direction of the rotating shaft 4.

[0047] Reference Figure 1 , Figure 2 , Figure 3 The driving assembly 3 includes a guide plate 31 and a driving impeller 32. The guide plate 31 is located in the connecting tube 1 and is coaxially arranged with the connecting tube 1. The guide plate 31 is provided with a first penetration hole 312 for the rotating shaft 4 to penetrate. The outer peripheral wall of the connecting tube 1 is provided with a plurality of mounting bolts 17, and the plurality of mounting bolts 17 are arranged at intervals around the central axis of the connecting tube 1. The outer peripheral wall of the guide plate 31 is provided with a plurality of mounting holes 313, and the plurality of mounting holes 313 are arranged corresponding to the plurality of mounting bolts 17. Each mounting bolt 17 penetrates into the connecting tube 1 and is threadedly connected with the corresponding mounting hole 313. The guide plate 31 is detachably connected to the connecting tube 1 through the plurality of mounting bolts 17.

[0048] There is a sealing gap 13 between the outer circumferential wall of the guide plate 31 and the inner circumferential wall of the connecting tube 1. A first sealing ring 14 is installed in the sealing gap 13. The first sealing ring 14 is made of rubber. The outer circumferential wall of the first sealing ring 14 abuts against the inner circumferential wall of the connecting tube 1, and the inner circumferential wall of the first sealing ring 14 abuts against the outer circumferential wall of the guide plate 31, so as to improve the sealing between the guide plate 31 and the connecting tube 1.

[0049] Reference Figure 3 , Figure 4 , Figure 5 The driving impeller 32 is installed on the outer peripheral wall of the rotating shaft 4, and the driving impeller 32 is located on the side of the guide plate 31 close to the rotating sleeve 21; a flow channel 311 is provided on the surface of the guide plate 31 away from the driving impeller 32, and the flow channel 311 penetrates the surface of the guide plate 31 close to the driving impeller 32, and the flow channel 311 is spiral around the central axis of the guide plate 31, and the opening of the flow channel 311 gradually decreases from the end away from the driving impeller 32 to the end close to the driving impeller 32; in this embodiment, the guide plate 31 is provided with a plurality of flow channels 311, and the plurality of flow channels 311 are arranged at intervals around the central axis of the guide plate 31.

[0050] Reference Figure 2 , Figure 3A limiting ring 321 is installed on the outer side of the driving impeller 32, and the limiting ring 321 and the driving impeller 32 are integrally formed, and the outer peripheral wall of the limiting ring 321 abuts against the inner peripheral wall of the connecting tube 1 or the inner peripheral wall of the rotating sleeve 21; it should be noted that in the present embodiment, in a driving component 3 closest to the rotating sleeve 21, the outer peripheral wall of the limiting ring 321 of the driving impeller 32 is fixedly connected to the inner peripheral wall of the rotating sleeve 21, and the rotating shaft 4 is fixedly connected to the rotating sleeve 21 through this driving impeller 32 and the corresponding limiting ring 321; in the other driving components 3, the limiting ring 321 of the driving impeller 32 abuts against the inner peripheral wall of the connecting tube 1 so that it can rotate relative to the connecting tube 1.

[0051] The implementation principle of Example 1 of the present application is as follows: the connecting tube 1 is connected to the casing and then placed in the wellbore. When encountering an obstacle protruding from the inner wall of the wellbore, drilling fluid of a certain pressure is flushed into the connecting tube 1 through the casing (no need to flush drilling fluid when no obstacle is encountered). When the drilling fluid passes through the flow channel 311 of the guide plate 31, the flow channel 311 can divide the drilling fluid into multiple strands, and each strand of drilling fluid is spiral, so as to impact the driving impeller 32 below, drive the rotating shaft 4 to rotate, and enable the alloy grinding drill block 211 of the rotating sleeve 21 to grind and trim the obstacles on the inner wall of the wellbore, so that when the casing is stuck during the casing lowering process, the wellbore blockage can be released and the jam can be successfully released, thereby achieving the purpose of smoothly entering the casing into the well.

[0052] The opening of the flow channel 311 gradually decreases from the end away from the driving impeller 32 to the end close to the driving impeller 32, so that when the drilling fluid passes through the flow channel 311, the flow rate of the drilling fluid can be increased, thereby achieving a pressurization effect; by setting up multiple groups of driving components 3, multi-stage pressurization of the drilling fluid is formed, the steering power of the steering head 2 is increased, and the grinding effect of the alloy drill block 211 on obstacles is improved. Example 2

[0053] The embodiment of the present application discloses a hydraulically driven casing head.

[0054] Reference Figure 6 , Figure 7 The difference between the hydraulically driven casing head disclosed in the embodiment of the present application and the embodiment 1 is that:

[0055] A sliding rod 12 is installed in the connecting tube 1. The sliding rod 12 is located on the side of the guide plate 31 away from the driving impeller 32 (this guide plate 31 is the guide plate 31 in the driving assembly 3 farthest from the rotating sleeve 21), and the sliding rod 12 is slidingly connected to the top wall of the guide plate 31; a plurality of sliding rods 12 are provided and are arranged at intervals around the central axis of the connecting tube 1, and both ends of each sliding rod 12 are extended along the radial direction of the connecting tube 1; in this embodiment, the number of sliding rods 12 is set corresponding to the number of flow channels 311 of the guide plate 31, and each sliding rod 12 is penetrated between the openings of two adjacent flow channels 311 to achieve the effect of avoiding the flow channels 311.

[0056] Reference Figure 6 , Figure 7 One end of each sliding rod 12 passes through the outer circumferential wall of the connecting tube 1 and is connected to an abutting arc bar 11. The abutting arc bar 11 is used to abut the inner circumferential wall of the wellbore. The abutting arc bar 11 is arranged in an arc shape around the central axis of the connecting tube 1. The abutting arc bar 11 is slidably installed on the connecting tube 1 through the sliding rod 12 and can be displaced along the radial direction of the connecting tube 1. The outer circumferential wall of the connecting tube 1 is correspondingly provided with a receiving groove 18 for receiving the abutting arc bar 11.

[0057] Reference Figure 7 , Figure 8 The connecting tube 1 is provided with a pushing assembly 5. When the drilling fluid is transported into the connecting tube 1, the pushing assembly 5 drives the abutting arc bar 11 to abut against the inner wall of the wellbore; the pushing assembly 5 includes a sliding seat 51, a sliding block 52 and a pushing member. The sliding seat 51 is slidably installed in the connecting tube 1. The sliding seat 51 is located above the rotating shaft 4 and is coaxially arranged with the rotating shaft 4. The outer peripheral wall of the sliding seat 51 is provided with a plurality of sliding grooves 511. The plurality of sliding grooves 511 are arranged at intervals around the central axis of the sliding seat 51. The plurality of sliding grooves 511 are correspondingly arranged with the plurality of sliding rods 12; the sliding block 52 is provided with a plurality of sliding grooves 511 and is correspondingly arranged. Each sliding block 52 is slidably installed in the corresponding sliding groove 511. One end of each sliding rod 12 away from the abutting arc bar 11 extends into the corresponding sliding groove 511 and is fixedly connected with the corresponding sliding block 52.

[0058] For ease of description, the two ends of the sliding groove 511 are defined as a first point position 512 and a second point position 513 below. The second point position 513 is located above the first point position 512. When the sliding block 52 is located at the first point position 512, the abutting arc bar 11 is received in the receiving groove 18 of the connecting tube 1 (that is, there is a gap between the abutting arc bar 11 and the inner wall of the wellbore). When the sliding block 52 is located at the second point position 513, the abutting arc bar 11 moves out of the receiving groove 18 and abuts against the inner wall of the wellbore.

[0059] Reference Figure 7 , Figure 8, a pushing member is arranged on the sliding seat 51, and the pushing member normally moves the sliding block 52 to the first point 512. When the drilling fluid is transported into the connecting tube 1, the pushing member drives the sliding seat 51 to be displaced so that the sliding block 52 moves to the second point 513; in this embodiment, the pushing member includes a pushing plate 53 and a first spring 54, and the pushing plate 53 is installed in the connecting portion 16 of the connecting tube 1. A connecting rod 531 is fixedly installed on the upper surface of the pushing plate 53, and the upper end surface of the connecting rod 531 is fixedly connected to the bottom wall of the sliding seat 51. The rotating shaft 4 is provided with a second penetration hole 41 for the connecting rod 531 to penetrate. The pushing plate 53 is connected to the sliding seat 51 through the connecting rod 531, and the pushing plate 53 is located on the side of the driving impeller 32 away from the guide plate 31 for the impact of drilling fluid (this driving impeller 32 is the driving impeller 32 connected to the rotating sleeve 21).

[0060] Reference Figure 7 , Figure 8 A cover plate 314 is installed on the inner circumferential wall of the first through hole 312 of the guide plate 31 (this guide plate 31 is the guide plate 31 in the driving assembly 3 farthest from the rotating sleeve 21), and a docking ring 315 is rotatably installed on the upper surface of the cover plate 314. The first spring 54 is sleeved on the connecting rod 531, and one end of the first spring 54 is fixedly connected to the bottom wall of the sliding seat 51, and the other end is fixedly connected to the docking ring 315. The first spring 54 normally causes the sliding seat 51 to move toward the side away from the rotating sleeve 21 so that the sliding block 52 moves to the first point 512.

[0061] Reference Figure 6 , Figure 7 In this embodiment, a guide cone block 514 is integrally formed on the top wall of the sliding seat 51. The tip of the guide cone block 514 is set upward. The guide cone block 514 has a plurality of guide surfaces 515. The plurality of guide surfaces 515 are arranged corresponding to the plurality of flow channels 311 of the guide plate 31 to guide the drilling fluid to flow to the corresponding flow channels 311.

[0062] Reference Figure 7 , Figure 8 A lifting groove 111 is provided on the inner arc surface abutting the arc bar 11, and both ends of the lifting groove 111 are extended in the height direction. A lifting block 112 is slidably installed in the lifting groove 111, and one end of the sliding rod 12 away from the sliding block 52 extends into the lifting groove 111 and is fixedly connected to the lifting block 112; a second spring 113 is installed in the lifting groove 111, one end of the second spring 113 is fixedly connected to the lifting block 112, and the other end is fixedly connected to the inner wall of the lifting groove 111. The second spring 113 normally causes the lifting block 112 to move to the middle position of the lifting groove 111.

[0063] The implementation principle of Example 2 of the present application is as follows: when the rotating sleeve 21 is lowered into the wellbore and encounters an obstacle, drilling fluid is injected into the connecting tube 1 to drive the rotating sleeve 21 to rotate. After the drilling fluid drives the rotating sleeve 21 to rotate, it continues to fall and impacts the push plate 53, so that the push plate 53 pulls the sliding seat 51 downward, thereby forcing the sliding block 52 to move to the second point 513. At this time, the abutting arc bar 11 moves out of the receiving groove 18 and abuts against the inner wall of the wellbore, thereby limiting the connecting tube 1, and then limiting the rotating sleeve 21, reducing the jitter amplitude of the rotating sleeve 21 in the horizontal direction, so that the alloy grinding drill block 211 can better act on the obstacle, thereby improving the grinding effect of the rotating sleeve 21 on the obstacle.

[0064] When the obstacle is ground away, the drilling fluid is stopped from being injected into the connecting tube 1. At this time, the abutting arc strip 11 is received in the receiving groove 18, so that the connecting tube 1 can be further lowered, thereby improving the operational convenience of the overall structure. Example 3

[0065] The embodiment of the present application discloses a hydraulically driven casing head.

[0066] Reference Fig. 9 The difference between the hydraulically driven casing head disclosed in the embodiment of the present application and the embodiment 2 is that:

[0067] In this embodiment, the pushing assembly 5 includes a pushing plate 55, a mounting block 56, a pushing block 57 and a pushing member. The pushing plate 55 is installed in the connecting tube 1, and is coaxially arranged between the pushing plate 55 and the rotating shaft 4. The pushing plate 55 is fixedly installed on the top wall of the docking ring 315, and the pushing plate 55 is rotatably installed in the connecting tube 1 through the docking ring 315; the outer peripheral wall of the pushing plate 55 is provided with a mounting ring groove 551, and the mounting ring groove 551 is arranged in a ring shape around the central axis of the pushing plate 55. There are multiple mounting blocks 56 and they are arranged corresponding to multiple sliding rods 12. All mounting blocks 56 are installed in the mounting ring groove 551, and one end of each sliding rod 12 away from the abutting arc bar 11 extends into the mounting ring groove 551 and is fixedly connected to the corresponding mounting block 56.

[0068] Reference Fig. 9 The pushing block 57 is fixedly mounted on the inner wall of the mounting ring groove 551, and a plurality of pushing blocks 57 are arranged at intervals around the central axis of the pushing disk 55. In this embodiment, the number of the pushing blocks 57 corresponds to the number of the mounting blocks 56, and each pushing block 57 has a pushing surface 571 for pushing the mounting block 56. When the pushing block 57 pushes the corresponding mounting block 56 through the pushing surface 571, so that the mounting block 56 moves away from the central axis of the pushing disk 55 to the maximum extent, the abutting arc bar 11 corresponding to the mounting block 56 abuts against the inner circumferential wall of the wellbore.

[0069] The pushing member is arranged on the pushing plate 55. When the drilling fluid is transported into the connecting tube 1, the pushing member drives the pushing plate 55 to rotate around its own central axis. In this embodiment, the pushing member is arranged as a pushing impeller (the structure of the pushing impeller is the same as that of the driving impeller 32, and the pushing impeller is not shown in the figure). The pushing impeller is located on the side of the driving impeller 32 away from the guide plate 31 for impact of the drilling fluid (this driving impeller 32 is the driving impeller 32 connected to the rotating sleeve 21). The pushing plate 55 is coaxially connected with a synchronous shaft 552. One end of the synchronous shaft 552 is fixedly connected to the lower surface of the pushing plate 55, and the other end passes through the second through hole 41 of the rotating shaft 4 and is coaxially fixed to the pushing impeller.

[0070] The implementation principle of Example 3 of the present application is as follows: when the drilling fluid rushes into the connecting tube 1 to drive the rotating sleeve 21 to rotate so as to grind the obstacle, the pushing disk 55 can rotate around its own central axis under the action of the pushing impeller, so that the pushing block 57 can push the mounting block 56, so that the abutting arc bar 11 abuts against the inner wall of the wellbore. As the pushing disk 55 continues to rotate, the abutting arc bar 11 can intermittently abut against the inner wall of the wellbore to avoid direct "locking" between the connecting tube 1 and the inner wall of the wellbore, so that when encountering a relatively hard obstacle, the rotating sleeve 21 has a certain degree of shaking space, thereby reducing the possibility of damage to the alloy grinding drill block 211 due to violent impact with the hard obstacle, thereby increasing the service life of the alloy grinding drill block 211. Example 4

[0071] The embodiment of the present application discloses a hydraulically driven casing head.

[0072] Reference Fig.10 The difference between the hydraulically driven casing head disclosed in the embodiment of the present application and the embodiment 2 is that:

[0073] In this embodiment, a sliding ring 15 is slidably installed in the connecting tube 1. The sliding ring 15 is located on the side of the guide plate 31 away from the driving impeller 32 (this guide plate 31 is the guide plate 31 in the driving assembly 3 farthest from the rotating sleeve 21). The sliding ring 15 is annular and is coaxially arranged between the connecting tube 1. The outer circumferential wall of the sliding ring 15 is in contact with the inner circumferential wall of the connecting tube 1; the inner diameter of the inner circumferential wall of the sliding ring 15 gradually decreases from the end away from the guide plate 31 to the end close to the guide plate 31, and a guide surface 151 is formed, and the inner diameter of the end of the sliding ring 15 close to the guide plate 31 is smaller than the outer diameter of the guide plate 31.

[0074] Reference Fig.10The connecting tube 1 is provided with a clamping piece. When drilling fluid is transported into the connecting tube 1, the clamping piece drives the sliding ring 15 to move downward and seals the upper end opening of the sealing gap 13. In this embodiment, the clamping piece includes a plurality of clamping columns 121. The number of the clamping columns 121 is arranged corresponding to the number of the sliding rods 12. One end of the clamping column 121 is fixedly connected to the side wall of the corresponding sliding rod 12. When the sliding rod 12 drives the abutting arc bar 11 to abut against the inner circumferential wall of the wellbore, the clamping column 121 pushes the guide surface 151 and forces the sliding ring 15 to seal the upper end opening of the sealing gap 13.

[0075] Reference Fig.10 The bottom wall of the sliding ring 15 is provided with an embedding groove 152, which is arranged in a ring shape around the central axis of the sliding ring 15. A second sealing ring 153 is embedded in the embedding groove 152. The second sealing ring 153 is made of rubber. The second sealing ring 153 is partially exposed in the embedding groove 152. When the sliding ring 15 blocks the upper end opening of the sealing gap 13, the second sealing ring 153 is deformed and completely moves into the embedding groove 152, and the second sealing ring 153 abuts against the top wall of the first sealing ring 14.

[0076] The implementation principle of Example 4 of the present application is as follows: on the one hand, through the setting of the guide surface 151, after the drilling fluid rushes into the connecting tube 1, the guide surface 151 can guide the drilling fluid, so that the drilling fluid is guided toward the flow channel 311 as much as possible, reducing the possibility of the drilling fluid entering the sealing gap 13, so that the pressure of the drilling fluid can act on the driving impeller 32 as much as possible, thereby providing sufficient power for the rotation of the rotating sleeve 21; on the other hand, after the drilling fluid rushes into the connecting tube 1, the sliding rod 12 is displaced under the action of the drilling fluid, driving the tightening column 121 to push the guide surface 151, forcing the sliding ring 15 to seal the upper end opening of the sealing gap 13, thereby further improving the sealing performance of the sealing gap 13.

[0077] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulically driven casing head, characterized in that: The invention comprises a connecting tube (1), a steering head (2) and a driving assembly (3); one end of the connecting tube (1) is connected to the steering head (2), and the other end is used to be connected to the casing; the steering head (2) is used to grind the inner wall of the wellbore; the steering head (2) is connected to a rotating shaft (4); the rotating shaft (4) is rotatably connected to the connecting tube (1); the steering head (2) is rotatably mounted on the connecting tube (1) via the rotating shaft (4); the driving assembly (3) is arranged between the connecting tube (1) and the rotating shaft (4) to drive the rotating shaft (4) to rotate, and the driving assembly (3) is provided with a plurality of groups along the axial direction of the rotating shaft (4); the driving assembly (3) comprises a plurality of rotating shafts (4) arranged on the connecting tube (1); ) and a driving impeller (32) arranged on a rotating shaft (4), the driving impeller (32) being located on a side of the guide plate (31) close to the steering head (2), the guide plate (31) being provided with a spiral flow channel (311), the flow channel (311) gradually decreasing in size from an end away from the driving impeller (32) to an end close to the driving impeller (32); the steering head (2) comprising a rotating sleeve (21) and a guide head (22), one end of the rotating sleeve (21) being rotatably connected to the connecting cylinder (1), and the other end being connected to the guide head (22), the rotating shaft (4) being arranged on the rotating sleeve (21), and the outer peripheral wall of the rotating sleeve (21) being provided with a plurality of An alloy grinding drill block (211) for grinding the inner wall of a wellbore; the guide head (22) is used to guide the rotating sleeve (21) into the well, and the outer diameter of the guide head (22) gradually decreases from the end close to the rotating sleeve (21) to the end away from the rotating sleeve (21); the outer wall of the connecting tube (1) is slidably installed with a plurality of abutting arc strips (11) for abutting the inner wall of the wellbore, and the plurality of abutting arc strips (11) are arranged at intervals around the central axis of the connecting tube (1); the connecting tube (1) is provided with a pushing component (5), and when drilling fluid is transported into the connecting tube (1), the pushing component (5) drives the abutting arc strips (11) to abut the inner wall of the wellbore; a sliding rod is slidably installed in the connecting tube (1) (12), one end of the sliding rod (12) passes through the connecting tube (1) and is connected to the abutting arc strip (11), and the abutting arc strip (11) is slidably installed on the connecting tube (1) through the sliding rod (12); the pushing component (5) comprises a sliding seat (51), a sliding block (52) and a pushing member, the sliding seat (51) is slidably installed in the connecting tube (1) and is coaxially arranged with the rotating shaft (4), the outer peripheral wall of the sliding seat (51) is provided with a sliding groove (511), the sliding block (52) is slidably installed in the sliding groove (511), and the end of the sliding rod (12) away from the abutting arc strip (11) extends into the sliding groove (511) and is connected to the sliding block (52);The sliding groove (511) has a first point position (512) and a second point position (513). When the sliding block (52) is located at the first point position (512), there is a gap between the abutting arc strip (11) and the inner wall of the wellbore. When the sliding block (52) is located at the second point position (513), the abutting arc strip (11) abuts against the inner wall of the wellbore. The pushing member is arranged on the sliding seat (51). The pushing member normally moves the sliding block (52) to the first point position (512). When the drilling fluid is transported into the connecting tube (1), the pushing member drives the sliding seat (51) to move so that the sliding block (52) moves to the second point position (513).

2. A hydraulically driven casing head according to claim 1, characterized in that: The rotating sleeve (21) and the guide head (22) are threadedly connected, and the direction of the thread between the rotating sleeve (21) and the guide head (22) is opposite to the rotation direction of the rotating sleeve (21).

3. A hydraulically driven casing head according to claim 1, characterized in that: The pushing member comprises a pushing plate (53) and a first spring (54); the pushing plate (53) is slidably installed in the connecting tube (1) and connected to the sliding seat (51); and the pushing plate (53) is located on a side of the driving impeller (32) away from the guide plate (31) for providing drilling fluid impact; the first spring (54) is arranged between the sliding seat (51) and the connecting tube (1); the first spring (54) normally causes the sliding seat (51) to move toward a side away from the steering head (2) so that the sliding block (52) moves to a first point position (512).

4. A hydraulically driven casing head according to claim 1, characterized in that: The inner arc surface of the abutting arc bar (11) is provided with a lifting groove (111), a lifting block (112) is slidably installed in the lifting groove (111), one end of the sliding rod (12) penetrates into the lifting groove (111) and is connected to the lifting block (112); a second spring (113) is provided between the inner walls of the lifting groove (111) and the lifting block (112), and the second spring (113) normally causes the lifting block (112) to move to the middle position of the lifting groove (111).

5. The hydraulically driven casing head according to claim 1, characterized in that: A sliding rod (12) is slidably installed in the connecting tube (1), one end of the sliding rod (12) passes through the connecting tube (1) and is connected to the abutting arc bar (11), and the abutting arc bar (11) is slidably installed on the connecting tube (1) through the sliding rod (12); the pushing assembly (5) comprises a pushing plate (55), a mounting block (56), a pushing block (57) and a pushing member, the pushing plate (55) is rotatably installed in the connecting tube (1) and is coaxially arranged with the rotating shaft (4), the outer peripheral wall of the pushing plate (55) is provided with a mounting ring groove (551), and the mounting block (56) is arranged on the mounting shaft (4). The mounting ring groove (551) is provided, and one end of the sliding rod (12) away from the abutting arc strip (11) extends into the mounting ring groove (551) and is connected to the mounting block (56); the pushing block (57) is arranged on the inner wall of the mounting ring groove (551), and a plurality of the pushing blocks (57) are arranged at intervals around the central axis of the pushing disk (55), and each of the pushing blocks (57) has a pushing surface (571) for pushing the mounting block (56); the pushing member is arranged on the pushing disk (55), and when the drilling fluid is transported into the connecting tube (1), the pushing member drives the pushing disk (55) to rotate around its own central axis.

6. The hydraulically driven casing head according to claim 1, characterized in that: A sealing gap (13) is provided between the outer peripheral wall of the guide plate (31) and the inner peripheral wall of the connecting tube (1), and a first sealing ring (14) is arranged in the sealing gap (13); a sliding ring (15) is slidably installed in the connecting tube (1), and the sliding ring (15) is located on the side of the guide plate (31) away from the driving impeller (32), and the sliding ring (15) and the connecting tube (1) are coaxially arranged, and the outer peripheral wall of the sliding ring (15) is in contact with the inner peripheral wall of the connecting tube (1); the connecting tube (1) is provided with a tightening member, and when drilling fluid is transported into the connecting tube (1), the tightening member drives the sliding ring (15) to move downward and seal the upper end opening of the sealing gap (13).

7. A hydraulically driven casing head according to claim 6, characterized in that: The inner diameter of the inner wall of the sliding ring (15) gradually decreases from the end away from the guide plate (31) to the end close to the guide plate (31), and forms a guide surface (151), and the inner diameter of the end of the sliding ring (15) close to the guide plate (31) is smaller than the outer diameter of the guide plate (31); the abutting member comprises a abutting column (121) arranged on the sliding rod (12), and when the sliding rod (12) drives the abutting arc bar (11) to abut against the inner wall of the wellbore, the abutting column (121) pushes the guide surface (151) and forces the sliding ring (15) to block the upper end opening of the sealing gap (13).

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