A downhole device for enhancing cementing quality

Abstract

The present invention provides a downhole device for enhancing cementing quality, including a coiled tubing. A primary driving device is connected to the lower end of the coiled tubing. A secondary upper housing is connected to the lower end of the primary driving device. The lower end of the secondary upper housing is connected to a secondary lower housing through a secondary lower connector. A plurality of upper vibrators and a plurality of lower vibrators are provided on the side wall of the secondary lower housing. A secondary driving shaft for driving the upper vibrators and the lower vibrators is provided in the secondary lower housing. A secondary driving assembly for driving the secondary driving shaft is provided in the secondary upper housing. The present invention further enhances the circumferential uniformity of the cement slurry for cementing through the upper vibrators and the lower vibrators. Moreover, the device has a simple structure and can be lowered into any position of the casing through the coiled tubing to achieve the enhancement effect on the cementing quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of cementing equipment, and particularly relates to a downhole device for enhancing cementing quality. Background Art

[0002] In the oil development project, after drilling is completed, a cementing operation needs to be carried out on the wellbore to prevent the fluid in the formation from mixing and flowing. The vibration cementing device can improve the cementing quality. Common vibration cementing devices include mechanical, pulsed, piezoelectric ceramic, magnetostrictive, and audio-frequency vibration cementing devices. However, the vibration forces of the above cementing devices in each direction are not the same, and the cement slurry in different directions is subjected to different forces, resulting in uneven filling in the formation. Summary of the Invention

[0003] The purpose of the present invention is to provide a downhole device for enhancing cementing quality, so as to improve the uniformity of the filling of the cement slurry in the formation and improve the cementing quality.

[0004] To achieve the above object, the present invention provides a downhole device for enhancing cementing quality, including a coiled tubing. The lower end of the coiled tubing is connected with a primary driving device. The lower end of the primary driving device is connected with a secondary upper housing. The lower end of the secondary upper housing is connected with a secondary lower housing through a secondary lower connector. A plurality of upper vibrators and a plurality of lower vibrators are arranged on the side wall of the secondary lower housing. A secondary driving shaft for driving the upper vibrators and the lower vibrators is arranged in the secondary lower housing. A secondary driving assembly for driving the secondary driving shaft is arranged in the secondary upper housing.

[0005] Further, the upper vibrator includes an upper vibrating rod. One end of the upper vibrating rod is inserted into the secondary lower housing. The other end of the upper vibrating rod is connected with an upper vibrating plate. A first elastic member is arranged between the upper vibrating rod and the inner wall of the secondary lower housing.

[0006] Further, the lower vibrator has the same structure as the upper vibrator, and the upper vibrating plate of the upper vibrator and the lower vibrating plate of the lower vibrator are arranged in a vertical cross pattern.

[0007] Further, the primary driving device includes a primary housing. The upper end of the primary housing is connected to the coiled tubing through an upper primary connector. The lower end of the primary housing is connected with a sealed bearing through a lower primary connector. A primary driving shaft is arranged in the primary housing. The primary driving shaft is axially provided with a fluid passage. The side wall of the upper part of the primary driving shaft is provided with a flow distribution hole. The middle part of the side wall of the primary housing is provided with a pressure relief hole. The upper part of the primary driving shaft passes through the upper primary connector and is in contact with it. A sliding pair is formed between the primary driving shaft and the upper primary connector. The lower part of the primary driving shaft passes through the lower primary connector and is located inside the sealed bearing. The side wall of the middle part of the primary driving shaft is in contact with the inner wall of the primary housing. A primary return spring is connected between the middle part of the primary driving shaft and the lower primary connector. A rotary structure is arranged inside the sealed bearing.

[0008] Further, the sealed bearing includes an upper support and a lower support. The upper end of the upper support is connected to the lower primary connector. The lower end of the upper support is rotatably connected to the lower support. The lower end of the lower support is connected to the upper secondary housing. The rotary structure includes a plurality of driving columns. A spiral driving groove is arranged on the side wall of the lower part of the primary driving shaft. One end of the driving column is located inside the spiral driving groove, and the other end of the driving column is connected to the lower support.

[0009] Further, the secondary driving shaft includes a cross-shaped shaft body. Upper vibration bosses matched with the upper vibrator and lower vibration bosses matched with the lower vibrator are arranged on the side wall of the lower part of the cross-shaped shaft body.

[0010] Further, the secondary driving assembly includes a secondary upper connector. A plurality of fluid flow channels are axially arranged in the secondary upper connector. The upper end of the upper secondary housing is connected to the sealed bearing through the secondary upper connector. A T-shaped drain channel is axially arranged in the secondary driving shaft. The upper part of the secondary driving shaft passes through the secondary upper connector and is in contact with it. The side wall of the middle part of the secondary driving shaft is in contact with the inner wall of the upper secondary housing. A secondary return spring is connected between the lower side of the middle part of the secondary driving shaft and the secondary lower connector.

[0011] Further, a primary positioner is arranged between the coiled tubing and the primary housing. The primary positioner includes a fixed support. The fixed support is sleeved on the upper primary connector. One end of a positioning rod is connected to the periphery of the fixed support, and the other end of the positioning rod is connected to a positioning wheel.

[0012] Further, a secondary positioner is arranged between the primary housing and the sealed bearing. The secondary positioner has the same structure as the primary positioner.

[0013] Further, a third-level locator is provided on the side wall of the secondary lower housing. The third-level locator includes a plurality of third-level positioning rods. One end of the third-level positioning rod is connected with a third-level positioning wheel, and a rubber sleeve is sleeved on the third-level positioning wheel. The other end of the third-level positioning rod is inserted into the secondary lower housing. A second elastic member is provided between the inner wall of the secondary lower housing and the third-level positioning rod. A positioning boss is sleeved on the lower part of the secondary drive shaft, and the positioning boss is matched with the third-level positioning rod.

[0014] The advantages of the present invention are as follows: The downhole device for enhancing the cementing quality provided by the present invention drives the upper vibrator and the lower vibrator simultaneously through the secondary drive shaft. The multiple upper vibrators and the multiple lower vibrators move synchronously, so that the vibration forces in all directions are the same, thereby improving the uniformity of the filling of the cement slurry for cementing in the formation and enhancing the cementing quality. The provided multi-level locator can accurately position the device, achieving the precise coincidence of the axis of the device and the axis of the casing, and prolonging the service life of the vibrating plate. The provided slewing mechanism can slewing the lower part of the device, enabling the device to vibrate in different directions of the casing, realizing uniform vibration in all directions of the inner wall of the casing, and ensuring uniform filling of the cement slurry outside the casing.

[0015] The following will describe the present invention in detail with reference to the drawings and embodiments. Description of the Drawings

[0016] Figure 1 It is a schematic structural view of the first-level drive shaft and the second-level drive shaft of the present invention moving to the lowermost end.

[0017] Figure 2 It is a schematic structural view of the initial state of the present invention.

[0018] Figure 3 It is a schematic internal structure view of the secondary lower housing.

[0019] Figure 4 It is Figure 2 The cross-sectional view taken along line A-A in

[0020] Figure 5 It is Figure 1 The enlarged schematic view at A in

[0021] Figure 6 It is a schematic structural view of the first-level drive shaft.

[0022] Figure 7 It is a schematic structural view of the second-level drive shaft.

[0023] Figure 8 It is Figure 1 The enlarged schematic view at B in

[0024] Description of the reference numerals in the drawings: 1. coiled tubing; 2. primary drive device; 201. primary housing; 202. primary upper connector; 203. primary lower connector; 204. sealed bearing; 2041. upper support; 2042. lower support; 2043. upper gland; 2044. inner boss; 2045. upper ball; 2046. upper limit frame; 2047. lower ball; 2048. lower limit frame; 205. primary drive shaft; 2051. primary upper seal ring; 2052. primary middle seal ring; 2053. primary lower seal ring; 206. fluid passage; 207. flow distribution hole; 208. pressure relief hole; 209. primary return spring; 210. slewing structure; 2101. drive column; 2102. spiral drive groove; 211. overflow hole; 212. guide boss; 213. guide groove; 3. secondary upper housing; 4. secondary lower connector; 5. secondary lower housing; 6. upper vibrator; 601. upper vibrating rod; 602. upper vibrating plate; 603. first elastic member; 7. lower vibrator; 8. secondary drive shaft; 801. upper vibration boss; 802. lower vibration boss; 803. positioning boss; 804. secondary upper seal ring; 805. secondary middle seal ring; 9. secondary drive assembly; 901. secondary upper connector; 902. secondary return spring; 903. fluid flow passage; 904. T-shaped drain passage; 10. primary positioner; 101. fixed support; 102. positioning rod; 103. positioning wheel; 11. secondary positioner; 12. tertiary positioner; 121. tertiary positioning rod; 122. tertiary positioning wheel; 123. rubber sleeve; 124. second elastic member; 125. tertiary positioner groove; 13. upper vibrator groove. Detailed implementation manners

[0025] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following will, in conjunction with the drawings and embodiments, describe in detail the specific implementation manners, structural features and their effects of the present invention as follows.

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "alignment", "overlap", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0028] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0029] Embodiment 1

[0030] This embodiment provides a downhole device for enhancing cementing quality as Figures 1 to 8 shown, including a coiled tubing 1. A primary driving device 2 is connected to the lower end of the coiled tubing 1. A secondary upper housing 3 is connected to the lower end of the primary driving device 2. The lower end of the secondary upper housing 3 is connected to a secondary lower housing 5 through a secondary lower connector 4. Specifically, both ends of the secondary lower connector 4 are threadedly connected to the secondary upper housing 3 and the secondary lower housing 5 respectively. A plurality of upper vibrators 6 and a plurality of lower vibrators 7 are provided on the side wall of the secondary lower housing 5. A secondary driving shaft 8 for driving the upper vibrators 6 and the lower vibrators 7 is provided inside the secondary lower housing 5. A secondary driving assembly 9 for driving the secondary driving shaft 8 is provided inside the secondary upper housing 3. During use, the secondary driving shaft 8 drives the upper vibrators 6 and the lower vibrators 7 simultaneously, and the plurality of upper vibrators 6 and the plurality of lower vibrators 7 move synchronously, so that the vibration forces in all directions are the same, thereby improving the uniformity of the filling of the cement slurry in the formation and enhancing the cementing quality. Moreover, the structure of this device is simple, and it can be lowered into any position of the casing through the coiled tubing 1 to achieve the strengthening effect on the cementing quality.

[0031] Furthermore, as Figures 1 to 3As shown in the figure, the upper vibrator 6 includes an upper vibration rod 601. An upper vibrator groove 13 is formed in the side wall of the secondary lower housing 5. One end of the upper vibration rod 601 is inserted into the secondary lower housing 5 through the upper vibrator groove 13. The other end of the upper vibration rod 601 is connected with an upper vibration piece 602. A first elastic member 603 is arranged between the upper vibration rod 601 and the inner wall of the secondary lower housing 5. Specifically, an installation groove is formed in the side wall of the upper vibration rod 601. One end of the first elastic member 603 is fixed to the installation groove, and the other end is fixed to the inner side of the upper vibrator groove 13. The first elastic member 603 enables the upper vibration rod 601 to always be in contact with the upper vibration boss 801. On a plane, the axis of the upper vibration piece 602 coincides with the axis of the positioning rod 102 of the adjacent primary positioner 10. More specifically, an annular rack is arranged on the outermost side of the upper vibration piece 602. When the upper vibration piece 602 contacts the inner wall of the sleeve, the small area of the annular rack can improve the vibration effect of the vibration piece.

[0032] Further, as Figures 1 to 4 shown, the lower vibrator 7 has the same structure as the upper vibrator 6, and the upper vibration piece 602 of the upper vibrator 6 and the lower vibration piece of the lower vibrator 7 are arranged crosswise in the vertical direction. More specifically, the number of both the upper vibrator 6 and the lower vibrator 7 is four, and they are evenly distributed in a ring on the side wall of the secondary lower housing 5.

[0033] Further, as Figures 1 to 2 shown, the primary drive device 2 includes a primary housing 201. The upper end of the primary housing 201 is connected with the coiled tubing 1 through a primary upper connector 202. Specifically, both ends of the primary upper connector 202 are threadedly connected with the primary housing 201 and the coiled tubing 1. The lower end of the primary housing 201 is connected with a sealed bearing 204 through a primary lower connector 203. Specifically, both ends of the primary lower connector 203 are threadedly connected with the primary housing 201 and the sealed bearing 204. A primary drive shaft 205 is arranged in the primary housing 201. As Figure 6 shown, the primary drive shaft 205 is cross-shaped. A fluid passage 206 is arranged axially on the primary drive shaft 205. The fluid passage 206 is used for fluid circulation. The fluid can be water, drilling fluid, and compressed air. Distribution holes 207 are formed in the side wall of the upper part of the primary drive shaft 205. Specifically, the distribution holes 207 are located at the lowermost side of the upper part of the primary drive shaft 205 and are used for distributing high-pressure fluid to the primary drive shaft 205 to drive the primary drive shaft 205 to move up and down.

[0034] As Figure 1 and Figure 2As shown in the figure, the upper part of the first-stage drive shaft 205 passes through the first-stage upper connector 202 and fits with it. Specifically, a set of first-stage upper sealing grooves are formed on the side wall of the upper part of the first-stage drive shaft 205, and a first-stage upper sealing ring 2051 is arranged in the first-stage upper sealing grooves. The outer side of the first-stage upper sealing ring 2051 is in close fit with the inner side of the first-stage upper connector 202, thus ensuring airtightness; the first-stage drive shaft 205 and the first-stage upper connector 202 form a sliding pair. Specifically, a vertical guiding groove 213 is arranged on the inner side of the first-stage upper connector 202. As Figure 1 and Figure 6 shown in the figure, a guiding boss 212 is arranged on the side wall of the upper part of the first-stage drive shaft 205. The arranged guiding boss 212 cooperates with the guiding groove 213, thus preventing the first-stage drive shaft 205 from rotating self. The lower part of the first-stage drive shaft 205 passes through the first-stage lower connector 203 and is located inside the sealing bearing 204. Specifically, a set of first-stage lower sealing grooves are formed on the side wall of the lower part of the first-stage drive shaft 205, and a first-stage lower sealing ring 2053 is arranged in the first-stage lower sealing grooves. The outer side of the first-stage lower sealing ring 2053 is in close fit with the inner side of the first-stage lower connector 203; the side wall of the middle part of the first-stage drive shaft 205 is in fit with the inner wall of the first-stage housing 201. Specifically, a set of first-stage middle sealing grooves are arranged on the side wall of the middle part of the first-stage drive shaft 205, and a first-stage middle sealing ring 2052 is arranged in the first-stage middle sealing grooves. The outer side of the first-stage middle sealing ring 2052 is in close fit with the inner wall of the first-stage housing 201. A first-stage return spring 209 is connected between the middle part of the first-stage drive shaft 205 and the first-stage lower connector 203, and a rotary structure 210 is arranged inside the sealing bearing 204.

[0035] As Figure 1 and Figure 2 shown in the figure, a pressure relief hole 208 is arranged in the middle of the side wall of the first-stage housing 201, and an overflow hole 211 is further arranged below the pressure relief hole 208 of the first-stage housing 201. When the first-stage middle sealing ring 2052 moves to the lower part of the pressure relief hole 208, the fluid in the upper part of the first-stage housing 201 is discharged to the outside of the first-stage housing 201. When the first-stage drive shaft 205 moves upward, the fluid flows into the first-stage housing 201 through the overflow hole 211. When the first-stage drive shaft 205 moves downward, the fluid flows out of the first-stage housing 201 through the overflow hole 211. When the first-stage middle sealing ring 2052 moves down to the lower part of the pressure relief hole 208, the first-stage return spring 209 provides upward power to drive the first-stage drive shaft 205 to move upward.

[0036] Further, as Figure 1 and Figure 5As shown, the sealed bearing 204 includes an upper support 2041 and a lower support 2042. The upper end of the upper support 2041 is threadedly connected to the first-stage lower connector 203, and the lower end of the upper support 2041 is rotatably connected to the lower support 2042. Specifically, the upper part of the lower support 2042 passes through the lower end of the upper support 2041. A set of sealing grooves are provided on the side wall of the upper part of the lower support 2042, and sealing rings are provided in the sealing grooves. The outer sides of the sealing rings are closely attached to the inner side wall of the lower end of the upper support 2041. An upper gland 2043 is threadedly connected to the upper end of the lower support 2042. An upper limit frame 2046 and a number of upper balls 2045 are provided between the upper gland 2043 and the inner boss 2044 of the upper support 2041. An annular groove is provided in the lower part of the upper gland 2043, and an annular groove is provided on the upper side of the inner boss 2044. The upper parts of the upper balls 2045 are in contact with the annular groove in the lower part of the upper gland 2043, pass through and are in contact with the upper limit frame 2046 in the middle, and the lower parts are in contact with the annular groove on the upper part of the inner boss 2044. The upper limit frame 2046 plays a role in limiting the relative positions of the upper balls 2045, thus ensuring the rotation between the upper support 2041 and the lower support 2042. A lower limit frame 2048 and a number of lower balls 2047 are provided between the lower part of the upper support 2041 and the lower support 2042. Annular grooves are provided on both the lower part of the upper support 2041 and the upper part of the lower support 2042. The upper parts of the lower balls 2047 are in contact with the annular groove in the lower part of the upper support 2041, pass through and are in contact with the lower limit frame 2048 in the middle, and the lower parts are in contact with the annular groove on the upper part of the lower support 2042. The lower limit frame 2048 plays a role in limiting the relative positions of the lower balls 2047 to ensure that the lower support 2042 makes a rotary motion. The lower end of the lower support 2042 is connected to the second-stage upper housing 3. The rotary structure 210 includes a number of driving columns 2101. A spiral driving groove 2102 is provided on the side wall of the lower part of the first-stage driving shaft 205. One end of the driving column 2101 is located in the spiral driving groove 2102, and the other end of the driving column 2101 is connected to the lower support 2042. When the first-stage driving shaft 205 moves downward, the lower support 2042 of the sealed bearing 204 will be driven to rotate through the spiral driving groove 2102 and the driving column 2101.

[0037] Further, as Figure 2 and Figure 7As shown, the secondary drive shaft 8 includes a cross-shaped shaft body. On the side walls of the lower part of the cross-shaped shaft body, an upper vibration boss 801 matching the upper vibrator 6 and a lower vibration boss 802 matching the lower vibrator 7 are fixed. Specifically, both the upper vibration boss 801 and the lower vibration boss 802 are in the shape of an inverted frustum. The upper vibration boss 801 is used to contact the upper vibration rod 601 to make the upper vibration rod 601 perform a radial movement, and the lower vibration boss 802 is used to contact the lower vibration rod to make the lower vibration rod perform a radial movement. Further, one ends of the upper vibration rod 601 and the lower vibration rod located inside the secondary lower housing 5 are both inclined upward, so as to facilitate the cooperation between the upper vibration boss 801 and the lower vibration boss 802. When the secondary drive shaft 8 moves up and down, when the secondary drive shaft 8 moves to the lowest position, the side wall of the upper vibration boss 801 is always in contact with the upper vibration rod 601, and the side wall of the lower vibration boss 802 is always in contact with the lower vibration rod, thus ensuring the smooth operation of the device.

[0038] Further, as Figure 2 and Figure 8 shown, the secondary drive assembly 9 includes a secondary upper connector 901. The secondary upper connector 901 is provided with a number of fluid flow channels 903 in the axial direction. Specifically, the number of fluid flow channels 903 is six, and they are distributed in a circumferential array. The upper end of the secondary upper housing 3 is connected to the sealed bearing 204 through the secondary upper connector 901. Specifically, both ends of the secondary upper connector 901 are threadedly connected to the secondary upper housing 3 and the sealed bearing 204 respectively. The secondary drive shaft 8 is provided with a T-shaped drain channel 904 in the axial direction. Specifically, the transverse channel of the T-shaped drain channel 904 is located in the upper part of the secondary drive shaft 8. The upper part of the secondary drive shaft 8 passes through the secondary upper connector 901 and is in contact with it. Specifically, two groups of secondary upper seal grooves are formed on the side wall of the upper part of the secondary drive shaft 8, and the two groups of secondary upper seal grooves are respectively located on the upper and lower sides of the transverse channel. Secondary upper seal rings 804 are arranged in the secondary upper seal grooves, and the outer sides of the secondary upper seal rings 804 are in close contact with the inner sides of the secondary upper connector 901; the side wall of the middle part of the secondary drive shaft 8 is in contact with the inner wall of the secondary upper housing 3, and a group of secondary middle seal grooves are formed on the side wall of the middle part of the secondary drive shaft 8, and secondary middle seal rings 805 are arranged in the secondary middle seal grooves; a secondary return spring 902 is connected between the lower side of the middle part of the secondary drive shaft 8 and the secondary lower connector 4. When the device is not working, the secondary return spring 902 supports the secondary drive shaft 8 to keep the secondary drive shaft 8 in the initial position. When the secondary drive shaft 8 moves to the lowest position, the secondary return spring 902 provides an upward spring force to drive the secondary drive shaft 8 to move upward.

[0039] Further, as Figure 1 and Figure 2As shown, a primary positioner 10 is provided between the coiled tubing 1 and the primary housing 201. The primary positioner 10 includes a fixed support 101 which is sleeved on the primary upper connector 202. Specifically, the fixed support 101 is threadedly connected to the primary upper connector 202. One end of a positioning rod 102 is connected to the circumferential side of the fixed support 101. Specifically, the positioning rod 102 is threadedly connected to the fixed support 101 for easy disassembly and assembly. The other end of the positioning rod 102 is connected to a positioning wheel 103 which can rotate freely on the positioning rod 102. Specifically, the positioning wheel 103 is made of metal, so as to prevent the positioning wheel 103 from deforming and ensure the positioning effect.

[0040] Furthermore, the positioning rod 102 is inclined downward at a certain angle relative to the fixed support 101. The inclination angle and length of the positioning rod 102 are both determined by the inner diameter of the casing. During use, the corresponding downhole device can be selected according to the casing diameter, the inclination of the positioning rod 102 and its length.

[0041] Furthermore, as Figure 1 and Figure 2 shown, a secondary positioner 11 is provided between the primary housing 201 and the sealed bearing 204. The secondary positioner 11 has the same structure as the primary positioner 10. Furthermore, the number of positioning rods 102 in both the primary positioner 10 and the secondary positioner 11 is four. In the plane, the included angle between the midlines of two adjacent positioning rods 102 of the primary positioner 10 and the secondary positioner 11 is 45°, so as to improve the positioning effect.

[0042] Furthermore, as Figure 2 and Figure 3As shown, a third-level locator 12 is provided on the side wall of the secondary lower housing 5. The third-level locator 12 includes a number of third-level positioning rods 121. One end of the third-level positioning rod 121 is connected with a third-level positioning wheel 122. A rubber sleeve 123 is sleeved on the third-level positioning wheel 122. The other end of the positioning rod 102 is inserted into the secondary lower housing 5. A second elastic member 124 is provided between the inner wall of the secondary lower housing 5 and the third-level positioning rod 121. Specifically, a third-level locator groove 125 is formed on the side wall of the secondary lower housing 5. The third-level positioning rod 121 is inserted into the secondary lower housing 5 through the third-level locator groove 125. An installation groove is formed on the side wall of the third-level positioning rod 121 inside the secondary lower housing 5. One end of the second elastic member 124 is fixed to the installation groove, and the other end is fixed to the inner side of the third-level locator groove 125. A positioning boss 803 is also sleeved on the lower part of the secondary drive shaft 8. Specifically, the positioning boss 803 is threadedly connected with the secondary drive shaft 8. The positioning boss 803 is matched with the third-level positioning rod 121. The positioning boss 803 is in the shape of an inverted frustum of a cone. One end of the third-level positioning rod 121 in contact with the positioning boss 803 is an inclined surface that slopes upward, so as to facilitate cooperation with the positioning boss 803. The provided second elastic member 124 makes the third-level positioning rod 121 and the positioning boss 803 always in a fitting state. On a plane, the midlines of two adjacent positioning rods 102 of the third-level locator 12 and the first-level locator 10 coincide.

[0043] The above-mentioned first elastic member 603 and second elastic member 124 are both pneumatic springs; the number of each group of sealing grooves is at least two to ensure the sealing effect.

[0044] Working process:

[0045] In use, the coiled tubing 1 is lowered by an LZ580 / 73T coiled tubing operation machine, and the up and down movement of the coiled tubing 1 is adjusted by the winding and unwinding of the coiled tubing operation machine, thereby adjusting the working height of the device. At the other end of the coiled tubing operation machine, the coiled tubing 1 is connected to a high-pressure fluid generating device. Specifically, the high-pressure fluid generating device can be an F1300 type mud pump or an RM75ie type air compressor. Then, the device is lowered into the casing in the well. After being lowered to the working height, the external device inputs high-pressure fluid through the coiled tubing 1. The high-pressure fluid first enters the fluid passage 206 of the first-stage drive shaft 205. A part of the high-pressure fluid entering the fluid passage 206 enters the first-stage housing 201 through the flow distribution hole 207. At this time, the high-pressure fluid generates a downward pressure on the middle part of the first-stage drive shaft 205, causing the first-stage drive shaft 205 to move downward. When the first-stage drive shaft 205 moves downward, it drives the lower support 2042 of the seal bearing 204 to rotate forward through the spiral drive groove 2102 and the drive post 2101. When the first-stage middle seal ring 2052 moves to the lower part of the pressure relief hole 208, the fluid in the upper part of the first-stage housing 201 is discharged to the outside of the first-stage housing 201. At this time, the downward acting force generated by the fluid in the upper part of the first-stage drive shaft 205 is less than the upward elastic force of the first-stage return spring 209, and the first-stage return spring 209 drives the first-stage drive shaft 205 to move upward. When the first-stage drive shaft 205 moves upward, it drives the lower support 2042 of the seal bearing 204 to rotate back to the initial position through the spiral drive groove 2102 and the drive post 2101;

[0046] Another part of the high-pressure fluid in the fluid passage 206 enters the second-stage upper housing 3 through the fluid flow passage 903 on the second-stage upper connector 901. The high-pressure fluid generates a downward pressure on the middle part of the second-stage drive shaft 8, driving the second-stage drive shaft 8 to move downward. When the T-shaped fluid discharge passage 904 moves to the lower part of the second-stage upper connector 901, the high-pressure fluid in the second-stage upper housing 3 is transported to the outside of the vibration device through the T-shaped fluid discharge passage 904. At this time, the upward acting force generated by the second-stage return spring 902 is greater than the downward acting force generated by the fluid in the upper part of the second-stage drive shaft 8, driving the second-stage drive shaft 8 to move upward. When the second-stage drive shaft 8 moves downward, it drives the upper vibration boss 801, the positioning boss 803, and the lower vibration boss 802 to move downward. The positioning boss 803 pushes the third-stage positioning rod 121 to drive the third-stage positioning wheel 122 to contact the inner wall of the casing prior to the upper vibration piece 602 and the lower vibration piece. When the second-stage drive shaft 8 continues to move downward, the rubber part of the third-stage positioning wheel 122 is compressed, realizing the precise positioning of the vibrator. When the rubber part of the third-stage positioning wheel 122 is compressed to the maximum compression amount, the vibration pieces of the upper vibrator 6 and the lower vibrator 7 contact the inner wall of the casing. The vibration pieces periodically contact the inner wall of the casing, causing the casing to vibrate. The casing transmits the vibration to the cement slurry outside the casing, enabling the cement slurry to fully and evenly fill the space outside the casing; the rotation of the lower part of the device realizes uniform vibration in all directions of the inner wall of the casing to ensure that the well cement outside the casing is evenly filled.

[0047] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An underground device for enhancing cementing quality, comprising a coiled tubing (1), characterized in that: The lower end of the coiled tubing (1) is connected to a primary drive device (2). The lower end of the primary drive device (2) is connected to a secondary upper housing (3). The lower end of the secondary upper housing (3) is connected to a secondary lower housing (5) through a secondary lower connector (4). A plurality of upper vibrators (6) and a plurality of lower vibrators (7) are provided on the side wall of the secondary lower housing (5). A secondary drive shaft (8) for driving the upper vibrators (6) and the lower vibrators (7) is provided inside the secondary lower housing (5). A secondary drive assembly (9) for driving the secondary drive shaft (8) is provided inside the secondary upper housing (3). The upper vibrator (6) includes an upper vibrating rod (601). One end of the upper vibrating rod (601) is inserted into the secondary lower housing (5), and the other end of the upper vibrating rod (601) is connected to an upper vibrating plate (602). A first elastic member (603) is provided between the upper vibrating rod (601) and the inner wall of the secondary lower housing (5). The lower vibrator (7) has the same structure as the upper vibrator (6), and the upper vibrating plates (602) of the upper vibrators (6) and the lower vibrating plates of the lower vibrators (7) are arranged crosswise in the vertical direction.

2. The downhole device for enhancing cementing quality according to claim 1, wherein: The primary drive device (2) includes a primary housing (201). The upper end of the primary housing (201) is connected to the coiled tubing (1) through a primary upper connector (202). The lower end of the primary housing (201) is connected to a sealed bearing (204) through a primary lower connector (203). A primary drive shaft (205) is provided inside the primary housing (201). A fluid passage (206) is provided in the axial direction of the primary drive shaft (205). A flow distribution hole (207) is provided in the side wall of the upper part of the primary drive shaft (205). A pressure relief hole (208) is provided in the middle of the side wall of the primary housing (201). The upper part of the primary drive shaft (205) passes through the primary upper connector (202) and fits with it. A sliding pair is formed between the primary drive shaft (205) and the primary upper connector (202). The lower part of the primary drive shaft (205) passes through the primary lower connector (203) and is located inside the sealed bearing (204). The side wall of the middle part of the primary drive shaft (205) fits with the inner wall of the primary housing (201). A primary return spring (209) is connected between the middle part of the primary drive shaft (205) and the primary lower connector (203). A rotary structure (210) is provided inside the sealed bearing (204).

3. The downhole device for enhancing cementing quality according to claim 2, characterized in that: The sealed bearing (204) includes an upper support (2041) and a lower support (2042). The upper end of the upper support (2041) is connected to the first-stage lower connector (203). The lower end of the upper support (2041) is rotatably connected to the lower support (2042). The lower end of the lower support (2042) is connected to the second-stage upper housing (3). The rotary structure (210) includes a number of drive posts (2101). A spiral drive groove (2102) is provided on the side wall of the lower part of the first-stage drive shaft (205). One end of the drive post (2101) is located in the spiral drive groove (2102), and the other end of the drive post (2101) is connected to the lower support (2042).

4. The downhole device for enhancing cementing quality according to claim 2, wherein: The second-stage drive shaft (8) includes a cross-shaped shaft body. Upper vibration bosses (801) matching the upper vibrator (6) and lower vibration bosses (802) matching the lower vibrator (7) are provided on the side wall of the lower part of the cross-shaped shaft body.

5. The downhole device for enhancing cementing quality according to claim 4, characterized in that: The second-stage drive assembly (9) includes a second-stage upper connector (901). A number of fluid flow channels (903) are provided axially in the second-stage upper connector (901). The upper end of the second-stage upper housing (3) is connected to the sealed bearing (204) through the second-stage upper connector (901). A T-shaped drain channel (904) is provided axially in the second-stage drive shaft (8). The upper part of the second-stage drive shaft (8) passes through the second-stage upper connector (901) and is arranged in close fit therewith. The side wall of the middle part of the second-stage drive shaft (8) is in close fit with the inner wall of the second-stage upper housing (3). A second-stage return spring (902) is connected between the lower side of the middle part of the second-stage drive shaft (8) and the second-stage lower connector (4).

6. The downhole device for enhancing cementing quality according to claim 2, wherein: A first-stage positioner (10) is provided between the coiled tubing (1) and the first-stage housing (201). The first-stage positioner (10) includes a fixed support (101). The fixed support (101) is sleeved on the first-stage upper connector (202). One end of a positioning rod (102) is connected to the peripheral side of the fixed support (101), and the other end of the positioning rod (102) is connected to a positioning wheel (103).

7. The downhole device for enhancing cementing quality according to claim 6, wherein: A second-stage positioner (11) is provided between the first-stage housing (201) and the sealed bearing (204). The second-stage positioner (11) has the same structure as the first-stage positioner (10).

8. The downhole device for enhancing the cementing quality according to claim 1 or 6 or 7, characterized in that: A third-stage positioner (12) is provided on the side wall of the second-stage lower housing (5). The third-stage positioner (12) includes a number of third-stage positioning rods (121). One end of the third-stage positioning rod (121) is connected to a third-stage positioning wheel (122). A rubber sleeve (123) is sleeved on the third-stage positioning wheel (122). The other end of the third-stage positioning rod (121) is inserted into the second-stage lower housing (5). A second elastic member (124) is provided between the inner wall of the second-stage lower housing (5) and the third-stage positioning rod (121). A positioning boss (803) is sleeved on the lower part of the second-stage drive shaft (8), and the positioning boss (803) matches the third-stage positioning rod (121).

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