CN109915075B - Downhole tool with milling and scraping functions - Google Patents
Downhole tool with milling and scraping functions Download PDFInfo
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- CN109915075B CN109915075B CN201910320415.XA CN201910320415A CN109915075B CN 109915075 B CN109915075 B CN 109915075B CN 201910320415 A CN201910320415 A CN 201910320415A CN 109915075 B CN109915075 B CN 109915075B
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Abstract
The invention relates to the technical field of downhole tools of oil and gas fields, in particular to a downhole tool with a milling and scraping function, which comprises a scraper, a wall scraper and a well dredger, wherein the lower end of the scraper and the upper end of the wall scraper are fixedly arranged together; the scraper comprises an upper joint, an upper outer sleeve, a cone, a milling cutter, a sliding sleeve, a lower outer sleeve and a lower joint, wherein the outer side of the lower part of the upper joint is fixedly installed with the inner side of the upper part of the upper outer sleeve. The invention has reasonable structure and convenient use, and realizes the underground operation of drifting, wall scraping and bell mouth milling only by one-time down drilling by fixedly mounting the scraper, the wall scraper and the drifting device together in sequence; the wall of the well is scraped through the matching of the milling cutter and the cone section; the sliding sleeve and the upper outer sleeve are connected through a key to better transmit torque; the wall scraper and the drifting device are prevented from rotating along with the scraper through the matching of the outer limiting block and the inner limiting block, and the device has the characteristics of high efficiency, rapidness and stability.
Description
Technical Field
The invention relates to the technical field of downhole tools for oil and gas fields, in particular to a downhole tool with a milling and scraping function.
Background
At present, shallow oil and gas are gradually developed and exhausted in the process of oil exploration and development. Therefore, the drilling machine can not drill deeply to search resources, and gradually drill from hundreds of meters to ten thousand meters, in order to ensure the smoothness of drilling construction, different drill bits can be used for drilling according to the requirements in the construction process according to the load capacity and the formation pressure coefficient of the drilling machine, and then different sleeves are used for completing the support of the upper well wall. The well bore configuration is also different in different configurations. When drilling deep wells and ultra-deep wells, most of oil layer casings of a target layer are hung on the upper part of a production layer by using casings with the first-grade smaller specifications for well completion. The well track can change frequently in the process of drilling the ultra-deep well, and the verticality can not be realized. The inner surface of the casing pipe is rubbed in the pulling-out process of a drilling tool with the length of thousands of meters, the friction impact of a coupling of the drilling tool can be obvious at the reducing position of a tail pipe hanger, particularly the upper end face of a short joint connection under the hanger is more serious, even burrs of an inner curled edge are smashed, the burrs can easily scratch a rubber sleeve of the packer, and the packer fails. In order to ensure the sealing safety of the packer, well dredging, wall scraping and bell mouth milling operations are carried out on an oil layer casing before the packer is put in, and particularly, in order to ensure the integrity of a rubber sleeve of the well completion packer, repairing operations must be carried out on a reducing position. The existing operation procedures need to separately go into a drift tube and a wall scraper to scrape the wall, then go into a milling cone to grind and mill the horn mouth, and can be completed by three times of drilling, so that the time for starting the next drilling is longer for deep wells and ultra-deep wells, the operation time is increased, and the working efficiency is low.
Disclosure of Invention
The invention provides an underground tool with milling and scraping functions, overcomes the defects of the prior art, and can effectively solve the problem that the conventional tool can realize well dredging, wall scraping and bell mouth milling only by three times of drilling.
The technical scheme of the invention is realized by the following measures: a downhole tool with a milling and scraping function comprises a scraper, a wall scraper and a well dredging device, wherein the lower end of the scraper and the upper end of the wall scraper are fixedly arranged together; the scraper comprises an upper connector, an upper outer sleeve, a cone, a milling cutter, a sliding sleeve, a lower outer sleeve and a lower connector, wherein the outer side of the lower part of the upper connector is fixedly arranged with the inner side of the upper part of the upper outer sleeve, an upper sealing ring platform is arranged on the inner side of the upper part of the upper outer sleeve, the cone is arranged in the upper part of the upper outer sleeve and comprises a straight pipe section and a cone section, the lower end of the straight pipe section is fixed with the upper end of the cone section, the upper end of the straight pipe section is fixedly arranged with the inner side of the upper part of the upper sealing ring platform through a one-way locking assembly capable of preventing the cone from moving upwards relative to the upper outer sleeve, the outer side of the lower part of the straight pipe section corresponding to the lower part of the upper sealing ring platform is provided with a lower sealing ring platform, an upper ring cavity is formed between the straight pipe section corresponding to the upper part of the lower sealing ring platform and the upper, the inner side of the lower part of the straight pipe section is provided with a pressure-building ring table, the outer side of the upper part of the straight pipe section corresponding to the position above the pressure-building ring table is circumferentially distributed with at least one upper circulating hole communicated with the upper ring cavity, the cone section is a circular table body with a large upper part and a small lower part, the outer side of the lower part of the upper outer sleeve corresponding to the position of the cone section is circumferentially distributed with at least one mounting square hole, the outer side of the cone section corresponding to the position of each mounting square hole is provided with a vertically through mounting groove, a milling cutter is arranged in each mounting square hole, the inner side of each milling cutter is provided with a mounting block matched with the mounting groove, each mounting block is limited and mounted in the mounting groove corresponding to the position, the outer side of each milling cutter can extend out of the mounting square hole; at least one lower circulation hole which can be communicated with the lower ring cavity is distributed on the outer side of the lower part of the upper outer sleeve corresponding to the position below the mounting square hole along the circumference; the inner side of the lower end of the cone section is fixedly installed with the outer side of the upper end of the sliding sleeve, the outer side of the middle part of the sliding sleeve is fixedly installed with the lower part of the upper outer sleeve through a fixed shear pin, and the outer side of the lower part of the sliding sleeve is installed with the inner side of the lower part of the upper outer sleeve through a key connection; the outer side of the lower part of the upper outer sleeve is fixedly installed with the lower outer sleeve, a lower joint with the upper part positioned at the inner side of the lower part of the sliding sleeve is sleeved in the lower outer sleeve, at least three outer limiting blocks are distributed on the outer side of the upper part of the lower joint along the circumference, inner limiting blocks are arranged on the inner side of the lower part of the sliding sleeve corresponding to the position between every two adjacent outer limiting blocks, and the outer side of the lower end of the lower joint is fixedly installed with the wall; the lower joint middle part outside is equipped with and to slide down the cover and carry out spacing ring platform, and the distance that spacing ring bench upper end and the cover lower extreme that slides is first distance, and the height of outer stopper is first height, and the height of interior stopper is the second height, and the height that upper seal ring platform lower part inboard and lower seal ring platform upper portion outside are sealed mutually is the third height, and first height is less than first distance, and the second height is less than first distance, and the third height is less than first distance.
The following is further optimization or/and improvement of the technical scheme of the invention:
the milling cutter can be in a hexagonal prism shape, the front side face of the milling cutter and the rear side face of the milling cutter are vertical faces, the top face of the milling cutter and the bottom face of the milling cutter are horizontal faces, the side face located on the upper portion of the inner side of the milling cutter is called an inner oblique cutting face, the inner oblique cutting face is tangent to the cone section, and the inner oblique cutting face is provided with a mounting block.
The mounting groove can be a dovetail groove with a wide inner part and a narrow outer part.
The one-way locking assembly can comprise a locking mandrel, outer stopping teeth, a locking ring, inner stopping teeth and anti-rotating screws, wherein the locking ring is fixedly installed on the inner side of the middle part of the upper outer sleeve, at least one group of inner stopping teeth are continuously arranged on the inner side of the locking ring from top to bottom, the inner stopping teeth are circular platforms with right-angled triangle sections and are narrow at the top and narrow at the bottom, the locking mandrel is arranged on the inner side of the upper outer sleeve corresponding to the position of the locking ring, the outer stopping teeth matched with the inner stopping teeth are arranged on the outer side of the locking mandrel corresponding to the position between every two adjacent inner stopping teeth, the outer stopping teeth are circular platforms with right-angled triangle sections and are narrow at the top and wide at the; an anti-rotation groove which is communicated up and down is distributed on the inner side of the lock ring along the circumference, at least one anti-rotation screw is arranged on the outer side of the locking mandrel corresponding to the anti-rotation groove, and the outer end of each anti-rotation screw is positioned in the anti-rotation groove; the outer side of the lower end of the locking mandrel is fixedly installed together with the inner side of the upper end of the straight pipe section.
The sliding sleeve can be a hollow three-stage step shaft, the sliding sleeve comprises a limiting section, a transition section and a fixing section, the outer diameters of the limiting section, the transition section and the fixing section are sequentially increased from top to bottom, the lower end of the limiting section is fixedly installed with the upper end of the transition section, and the lower end of the inner side of the milling cutter, corresponding to the outer side position of the limiting section, abuts against the upper end of the transition section; the lower end of the transition section is fixedly installed with the upper end of the fixed section, and the outer side of the middle part of the fixed section is fixedly installed with the lower part of the upper outer sleeve through a fixed shear pin; a first inner ring groove and a second inner ring groove are sequentially arranged on the inner side of the fixed section from top to bottom, the inner diameter of the first inner ring groove is smaller than that of the second outer ring groove, and inner limiting blocks are arranged in the second inner ring grooves corresponding to the positions between every two adjacent outer limiting blocks; the outer side of the lower part of the fixed section and the inner side of the lower part of the upper outer sleeve are connected and installed together through a key.
The bearing further comprises an inner ring table, an upper bearing and a lower bearing, wherein the inner ring table positioned below the limit ring table is arranged on the inner side of the lower end of the lower outer sleeve, the lower bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position between the limit ring table and the inner ring table, and the upper bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position above the limit ring table.
The device also comprises an O-shaped sealing ring and an O-shaped sealing element, wherein at least one O-shaped sealing ring is arranged between the upper joint and the upper outer sleeve, at least one O-shaped sealing ring is arranged between the upper sealing ring platform and the lower sealing ring platform, at least one O-shaped sealing ring is arranged between the sliding sleeve corresponding to the lower position of the lower circulation hole and the upper outer sleeve, at least one O-shaped sealing element is arranged between the cone pipe and the sliding sleeve, and at least one O-shaped sealing element is arranged between the sliding sleeve corresponding to the upper position of the outer limiting block and the lower joint.
The lower end of the lower joint and the upper end of the wall scraper can be fixedly installed together through threads; the lower end of the wall scraper and the upper end of the well dredger are fixedly installed together through threads; the outer side of the lower part of the upper joint and the inner side of the upper part of the upper outer sleeve are fixedly arranged together through threads; a lock ring is fixedly arranged on the inner side of the middle part of the upper outer sleeve through threads; the inner side of the lower end of the cone section is fixedly installed with the outer side of the upper end of the sliding sleeve through threads; the outer side of the lower part of the upper outer sleeve and the lower outer sleeve are fixedly installed together through threads.
The outer side of the lower part of the upper joint and the inner side of the upper part of the upper outer sleeve can be fixedly arranged together through double-stage threads; a lock ring is fixedly arranged on the inner side of the middle part of the upper outer sleeve through sawtooth threads; the outer side of the lower part of the upper outer sleeve and the lower outer sleeve are fixedly installed together through double-stage threads.
The invention has reasonable structure and convenient use, and realizes the underground operation of drifting, wall scraping and bell mouth milling only by one-time down drilling by fixedly mounting the scraper, the wall scraper and the drifting device together in sequence; the wall of the well is scraped through the matching of the milling cutter and the cone section; the sliding sleeve and the upper outer sleeve are connected through a key to better transmit torque; the wall scraper and the drifting device are prevented from rotating along with the scraper through the matching of the outer limiting block and the inner limiting block, and the device has the characteristics of high efficiency, rapidness and stability.
Drawings
Fig. 1 is a schematic front view of the preferred embodiment of the present invention.
Fig. 2 is a front sectional enlarged structural schematic view of the scraper in fig. 1.
FIG. 3 is a schematic sectional view of the milling cutter in FIG. 2 in an extended state after the ball is thrown and pressed.
Fig. 4 is a schematic cross-sectional view at a-a of fig. 2.
Fig. 5 is a schematic cross-sectional view at B-B of fig. 3.
Fig. 6 is a partially enlarged schematic view at C of fig. 2.
The codes in the figures are respectively: the device comprises an upper joint 1, an upper outer sleeve 2, a milling cutter 3, a lower outer sleeve 4, a lower joint 5, an upper sealing ring table 6, a straight pipe 7, a taper section 8, a lower sealing ring table 9, an upper ring cavity 10, a lower ring cavity 11, a pressure retaining ring table 12, an upper circulation hole 13, a mounting square hole 14, a mounting groove 15, a mounting block 16, a lower circulation hole 17, a fixing shear pin 18, an outer limiting block 19, an inner limiting block 20, a limiting ring table 21, a locking mandrel 22, an outer stopping tooth 23, a locking ring 24, an inner stopping tooth 25, an anti-rotation screw 26, a limiting section 27, a transition section 28, a fixed section 29, an inner ring table 30, an upper bearing 31, a lower bearing 32, an O-shaped sealing ring 33, an O-shaped sealing element 34, a pressure retaining ball 35, a circulation channel 36, a wall scraper 37 and a well dredging device 38.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention is further described with reference to the following examples and figures:
as shown in fig. 1, 2, 3, 4, 5 and 6, the downhole tool with milling and scraping functions comprises a scraper, a wall scraper 37 and a well dredger 38, wherein the lower end of the scraper is fixedly installed with the upper end of the wall scraper 37, and the lower end of the wall scraper 37 is fixedly installed with the upper end of the well dredger 38; the scraper comprises an upper connector 1, an upper outer sleeve 2, a cone, a milling cutter 3, a sliding sleeve, a lower outer sleeve 4 and a lower connector 5, the outer side of the lower part of the upper connector 1 is fixedly installed with the inner side of the upper part of the upper outer sleeve 2, the inner side of the upper part of the upper outer sleeve 2 is provided with an upper sealing ring table 6, the upper part of the upper outer sleeve 2 is internally provided with the cone, the cone comprises a straight pipe section 7 and a cone section 8, the lower end of the straight pipe section 7 is fixed with the upper end of the cone section 8, the upper end of the straight pipe section 7 and the inner side of the upper part of the upper sealing ring table 6 are fixedly installed together through a one-way locking assembly capable of preventing the cone from moving upwards relative to the upper outer sleeve 2, the outer side of the lower part of the straight pipe section 7 corresponding to the lower part of the upper sealing ring table 6 is provided with a lower sealing ring table 9, the inner side of the lower part of, a lower ring cavity 11 is formed between the upper outer sleeve 2 corresponding to the position below the upper sealing ring table 6 and the lower sealing ring table 9, a pressure retaining ring table 12 is arranged on the inner side of the lower part of the straight pipe section 7, at least one upper circulating hole 13 capable of being communicated with the upper ring cavity 10 is circumferentially distributed on the outer side of the upper part of the straight pipe section 7 corresponding to the position above the pressure retaining ring table 12, the cone section 8 is a round table body with a large upper part and a small lower part, at least one mounting square hole 14 is circumferentially distributed on the outer side of the lower part of the upper outer sleeve 2 corresponding to the position of the cone section 8, a vertically through mounting groove 15 is arranged on the outer side of the cone section 8 corresponding to the position of each mounting square hole 14, a milling cutter 3 is arranged in each mounting square hole 14, a mounting block 16 capable of being matched with the mounting groove 15 is arranged on the inner side of each milling cutter 3, each mounting block 16 is limitedly mounted in the mounting groove 15 corresponding, a flow channel 36 is arranged on the outer side of the cone section 8 corresponding to the position between every two milling cutters 3; at least one lower circulation hole 17 which can be communicated with the lower ring cavity 11 is distributed along the circumference at the outer side of the lower part of the upper outer sleeve 2 corresponding to the position below the mounting square hole 14; the inner side of the lower end of the cone section 8 and the outer side of the upper end of the sliding sleeve are fixedly arranged together, the outer side of the middle part of the sliding sleeve is fixedly arranged together with the lower part of the upper outer sleeve 2 through a fixed shear pin 18, and the outer side of the lower part of the sliding sleeve and the inner side of the lower part of the upper outer sleeve 2 are arranged together through a key connection; the outer side of the lower part of the upper outer sleeve 2 is fixedly installed with the lower outer sleeve 4, a lower joint 5 with the upper part positioned at the inner side of the lower part of the sliding sleeve is sleeved in the lower outer sleeve 4, at least three outer limiting blocks 19 are distributed on the outer side of the upper part of the lower joint 5 along the circumference, inner limiting blocks 20 are arranged on the inner side of the lower part of the sliding sleeve corresponding to the position between every two adjacent outer limiting blocks 19, and the outer side of the lower end of the lower joint 5 is fixedly installed with a wall; the outside of 5 middle parts of lower clutch is equipped with and carries out spacing stop collar platforms 21 down to the cover that slides, and the distance that stop collar platform 21 upper end and the cover lower extreme that slides is first distance, and outer stopper 19 highly be first height, and interior stopper 20 highly be the second height, and the height that seals mutually is the third height with the outside of lower seal collar 9 upper portion in the inboard of 6 lower parts of upper seal collar platform, and first height is less than first distance, and the second height is less than first distance, and the third height is less than first distance. The wall scraper 37 may be a conventional hydraulic wall scraper 37, and the drift 38 may be a conventional drift gauge, and the diameter of the drift gauge, the diameter of the hydraulic wall scraper 37, and the milling cutter 3 of the scraper are selected to be suitable according to the parameters such as the structural size of the well bore, the outer diameter of the pipe column to be scraped, the material, and the like. The using process of the invention is as follows:
(1) putting the pipe string downwards: the scraper, the wall scraper 37 and the drift shaft 38 are sequentially and fixedly installed together, then the upper pipe string and the upper joint 1 are fixedly installed together, and finally the well is put into a well after connection;
(2) drifting operation: when the well-connected drift size gauge is lowered into the well, drift operation is carried out through the drift size gauge; when the pipe string is put down, the uniform speed and stability of the invention are ensured, and the quick stop, quick release, drill sliding and drill stopping are forbidden;
(3) wall scraping operation: when the hydraulic wall scraper 37 is lowered to the upper and lower 20 meters of the setting position of the packer, a hydraulic wall scraper 37 starting ball is put into the pipe string and is pressed, so that a scraper of the wall scraper 37 is started to enable the wall scraper 37 to carry out wall scraping operation;
(4) scraping operation: after the well dredging operation and the wall scraping operation are finished, the pipe string is lifted to a position above a bell mouth by about 10 meters, the pressure holding ball 35 is put into the pipe string to the pressure holding ring table 12, namely the pressure holding ball 35 is seated, and the pressure holding is started; when the pressure rises to a certain value, the pressure drops suddenly to indicate that the scraper tool is started, namely the fixed shear pin 18 is sheared, at the moment, due to the blocking effect of the pressure-holding ring table 12, liquid in the pipe pushes the conical pipe to move downwards through the pressure-holding ball 35, at the moment, the milling cutter 3 is matched with the conical section 8, the milling cutter 3 gradually extends out of the mounting square hole 14 and is positioned on the outer side of the upper outer sleeve 2, and the milling cutter 3 cannot slip from the outer side of the upper outer sleeve 2 due to the matching of the mounting groove 15 and the mounting block 16; after the lower end of the sliding sleeve is contacted with the limiting ring table 21, the sliding sleeve stops moving downwards, and at the moment, the upper pipe string is rotated, so that the scraper can carry out scraping operation;
(5) lifting the pipe string: after the scraping operation is finished, the invention is directly lifted.
Because the third height is less than the first distance, when the lower end of the sliding sleeve is contacted with the limit ring table 21, the inner side of the lower part of the upper sealing ring table 6 is not contacted with the outer side of the upper part of the lower sealing ring table 9 any more, so that the upper ring cavity 10 is communicated with the lower ring cavity 11, and at the moment, the upper circulation hole 13 is communicated with the lower circulation hole 17, namely the interior of the pipe string is communicated with the exterior of the pipe string; because the first height and the second height are both smaller than the first distance, the outer limiting block 19 and the inner limiting block 20 are completely staggered due to the descending of the sliding sleeve, so that the rotation of the scraper cannot drive the lower joint 5, the wall scraper 37 and the drift shaft device 38 to rotate; in addition, the flow of liquid between the inner cone section 8 and the upper outer sleeve 2 is enhanced by the provision of the flow passage 36. The invention has reasonable structure and convenient use, and can realize the underground operation of drifting, wall scraping and bell mouth milling only by one-time drilling through fixedly mounting the scraper, the wall scraper 37 and the drifting device 38 together in sequence, thereby having the characteristics of high efficiency, rapidness and stability.
The downhole tool with the milling and scraping functions can be further optimized or/and improved according to actual needs:
as shown in fig. 1, 2, 3, 4, 5 and 6, the milling cutter 3 is in a hexagonal prism shape, the front side surface of the milling cutter 3 and the rear side surface of the milling cutter 3 are both vertical surfaces, the top surface of the milling cutter 3 and the bottom surface of the milling cutter 3 are both horizontal surfaces, the side surface positioned at the upper part of the inner side of the milling cutter 3 is called an inner inclined cutting surface, the inner inclined cutting surface is tangent to the cone section 8, and a mounting block 16 is arranged on the inner inclined cutting surface. In use, the inner chamfer is made more stable and reliable when moving along the cone segment 8 by such an arrangement. The mounting groove 15 may be a dovetail groove, an i-shaped groove, a T-shaped groove, etc. known in the art as required.
As shown in fig. 1, 2, 3, 4, 5 and 6, the mounting groove 15 is a dovetail groove with a wide inner part and a narrow outer part. In the use, through such setting not only make the interior chamfer more reliable and more stable when moving along cone section 8, can also be convenient for process.
As shown in fig. 1, 2, 3, 4, 5, and 6, the unidirectional locking assembly includes a locking core shaft 22, an outer stopping tooth 23, a locking ring 24, an inner stopping tooth 25, and an anti-rotation screw 26, the inner side of the middle portion of the upper outer sleeve 2 is fixedly provided with the locking ring 24, the inner side of the locking ring 24 is continuously provided with at least one group of inner stopping teeth 25 from top to bottom, the inner stopping teeth 25 are ring platforms with right-angled triangle cross sections, the ring platforms are wide at the top and narrow at the bottom, the inner side of the upper outer sleeve 2 corresponding to the position of the locking ring 24 is provided with the locking core shaft 22, the outer side of the locking core shaft 22 corresponding to the position between every two adjacent inner stopping teeth 25 is provided with the outer stopping tooth 23 matched with the inner stopping tooth 25, and the outer stopping teeth 23 are ring platforms with right; an anti-rotation groove which is through up and down is distributed on the inner side of the lock ring 24 along the circumference, at least one anti-rotation screw 26 is arranged on the outer side of the locking core shaft 22 corresponding to the anti-rotation groove, and the outer end of each anti-rotation screw 26 is positioned in the anti-rotation groove; the outer side of the lower end of the locking mandrel 22 and the inner side of the upper end of the straight pipe section 7 are fixedly installed together. In use, the locking mandrel 22 is prevented from moving upwardly relative to the locking ring 24 by this arrangement, thereby achieving a one-way locking function.
As shown in fig. 1, 2, 3, 4, 5 and 6, the sliding sleeve is a hollow three-stage step shaft, the sliding sleeve comprises a limiting section 27, a transition section 28 and a fixing section 29, the outer diameters of which are sequentially increased from top to bottom, the lower end of the limiting section 27 is fixedly installed with the upper end of the transition section 28, and the lower end of the inner side of the milling cutter 3 corresponding to the outer side position of the limiting section 27 is abutted against the upper end of the transition section 28; the lower end of the transition section 28 and the upper end of the fixed section 29 are fixedly arranged together, and the outer side of the middle part of the fixed section 29 is fixedly arranged together with the lower part of the upper outer sleeve 2 through a fixed shear pin 18; a first inner ring groove and a second inner ring groove are sequentially arranged on the inner side of the fixed section 29 from top to bottom, the inner diameter of the first inner ring groove is smaller than that of the second outer ring groove, and an inner limiting block 20 is arranged in the second inner ring groove corresponding to the position between every two adjacent outer limiting blocks 19; the lower outer side of the fixed section 29 is connected with the lower inner side of the upper outer sleeve 2 through a key. In the using process, the upper end of the lower joint 5 is positioned in the first inner annular groove by arranging the first inner annular groove, so that the downward movement of the sliding sleeve is limited by the contact between the upper end of the first inner annular groove and the upper end of the lower joint 5 in the downward movement process of the sliding sleeve; by providing a second inner annular groove, the outer stopper 19 and the inner stopper 20 are facilitated to cooperate, thereby preventing the wall scraper 37 and the drift collar 38 from rotating with the scraper.
As shown in fig. 1, 2, 3, 4, 5 and 6, the inner ring table 30, the upper bearing 31 and the lower bearing 32 are further included, the inner ring table 30 located below the limit ring table 21 is arranged on the inner side of the lower end of the lower outer sleeve 4, the lower bearing 32 is arranged between the lower outer sleeve 4 and the lower joint 5 corresponding to the position between the limit ring table 21 and the inner ring table 30, and the upper bearing 31 is arranged between the lower outer sleeve 4 and the lower joint 5 corresponding to the position above the limit ring table 21. During use, the upper bearing 31 and the lower bearing 32 are installed, so that the friction force between the lower outer sleeve 4 and the lower joint 5 is reduced, the abrasion of the lower outer sleeve 4 and the lower joint 5 is reduced, and the service life is prolonged.
As shown in fig. 1, 2, 3, 4, 5, and 6, the sealing device further includes an O-ring 33 and an O-ring 34, at least one O-ring 33 is disposed between the upper joint 1 and the upper outer sleeve 2, at least one O-ring 33 is disposed between the upper sealing ring table 6 and the lower sealing ring table 9, at least one O-ring 33 is disposed between the sliding sleeve corresponding to the lower position of the lower circulation hole 17 and the upper outer sleeve 2, at least one O-ring 34 is disposed between the cone tube and the sliding sleeve, and at least one O-ring 34 is disposed between the sliding sleeve corresponding to the upper position of the outer stopper 19 and the lower joint 5. The sealing between the parts of the invention is enhanced by the installation of an O-ring seal 33 and an O-ring seal 34 during use.
As shown in fig. 1, 2, 3, 4, 5 and 6, the lower end of the lower joint 5 is fixedly installed with the upper end of the wall scraper 37 through threads; the lower end of the wall scraper 37 and the upper end of the drift well device 38 are fixedly installed together through threads; the outer side of the lower part of the upper joint 1 and the inner side of the upper part of the upper outer sleeve 2 are fixedly arranged together through threads; a lock ring 24 is fixedly arranged on the inner side of the middle part of the upper outer sleeve 2 through threads; the inner side of the lower end of the cone section 8 and the outer side of the upper end of the sliding sleeve are fixedly installed together through threads; the lower outer side of the upper outer sleeve 2 and the lower outer sleeve 4 are fixedly installed together through threads. During the use process, the components of the invention are convenient to detach, install and replace by a fixed installation mode of threaded connection.
As shown in the attached figures 1, 2, 3, 4, 5 and 6, the outer side of the lower part of the upper joint 1 and the inner side of the upper part of the upper outer sleeve 2 are fixedly installed together through double-stage threads; a lock ring 24 is fixedly arranged on the inner side of the middle part of the upper outer sleeve 2 through sawtooth threads; the outer side of the lower part of the upper outer sleeve 2 and the lower outer sleeve 4 are fixedly installed together through double-stage threads. During the use process, the use strength and the stability of the invention during the use are enhanced through the arrangement.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (10)
1. The downhole tool with the milling and scraping functions is characterized by comprising a scraper, a wall scraper and a well dredging device, wherein the lower end of the scraper and the upper end of the wall scraper are fixedly arranged together; the scraper comprises an upper connector, an upper outer sleeve, a cone, a milling cutter, a sliding sleeve, a lower outer sleeve and a lower connector, wherein the outer side of the lower part of the upper connector is fixedly arranged with the inner side of the upper part of the upper outer sleeve, an upper sealing ring platform is arranged on the inner side of the upper part of the upper outer sleeve, the cone is arranged in the upper part of the upper outer sleeve and comprises a straight pipe section and a cone section, the lower end of the straight pipe section is fixed with the upper end of the cone section, the upper end of the straight pipe section is fixedly arranged with the inner side of the upper part of the upper sealing ring platform through a one-way locking assembly capable of preventing the cone from moving upwards relative to the upper outer sleeve, the outer side of the lower part of the straight pipe section corresponding to the lower part of the upper sealing ring platform is provided with a lower sealing ring platform, an upper ring cavity is formed between the straight pipe section corresponding to the upper part of the lower sealing ring platform and the upper, the inner side of the lower part of the straight pipe section is provided with a pressure-building ring table, the outer side of the upper part of the straight pipe section corresponding to the position above the pressure-building ring table is circumferentially distributed with at least one upper circulating hole communicated with the upper ring cavity, the cone section is a circular table body with a large upper part and a small lower part, the outer side of the lower part of the upper outer sleeve corresponding to the position of the cone section is circumferentially distributed with at least one mounting square hole, the outer side of the cone section corresponding to the position of each mounting square hole is provided with a vertically through mounting groove, a milling cutter is arranged in each mounting square hole, the inner side of each milling cutter is provided with a mounting block matched with the mounting groove, each mounting block is limited and mounted in the mounting groove corresponding to the position, the outer side of each milling cutter can extend out of the mounting square hole; at least one lower circulation hole which can be communicated with the lower ring cavity is distributed on the outer side of the lower part of the upper outer sleeve corresponding to the position below the mounting square hole along the circumference; the inner side of the lower end of the cone section is fixedly installed with the outer side of the upper end of the sliding sleeve, the outer side of the middle part of the sliding sleeve is fixedly installed with the lower part of the upper outer sleeve through a fixed shear pin, and the outer side of the lower part of the sliding sleeve is installed with the inner side of the lower part of the upper outer sleeve through a key connection; the outer side of the lower part of the upper outer sleeve is fixedly installed with the lower outer sleeve, a lower joint with the upper part positioned at the inner side of the lower part of the sliding sleeve is sleeved in the lower outer sleeve, at least three outer limiting blocks are distributed on the outer side of the upper part of the lower joint along the circumference, inner limiting blocks are arranged on the inner side of the lower part of the sliding sleeve corresponding to the position between every two adjacent outer limiting blocks, and the outer side of the lower end of the lower joint is fixedly installed with the wall; the lower joint middle part outside is equipped with and to slide down the cover and carry out spacing ring platform, and the distance that spacing ring bench upper end and the cover lower extreme that slides is first distance, and the height of outer stopper is first height, and the height of interior stopper is the second height, and the height that upper seal ring platform lower part inboard and lower seal ring platform upper portion outside are sealed mutually is the third height, and first height is less than first distance, and the second height is less than first distance, and the third height is less than first distance.
2. The downhole tool with the milling and scraping functions as claimed in claim 1, wherein the milling cutter is hexagonal prism shaped, the front side surface of the milling cutter and the rear side surface of the milling cutter are vertical surfaces, the top surface of the milling cutter and the bottom surface of the milling cutter are horizontal surfaces, the side surface positioned at the upper part of the inner side of the milling cutter is called an inner chamfer surface, the inner chamfer surface is tangent to the cone section, and the inner chamfer surface is provided with a mounting block.
3. The downhole tool with the milling and scraping functions as claimed in claim 2, wherein the mounting groove is a dovetail groove with a wide inner part and a narrow outer part.
4. The downhole tool with the milling and scraping functions as claimed in claim 1, 2 or 3, wherein the one-way locking assembly comprises a locking mandrel, outer anti-return teeth, a locking ring, inner anti-return teeth and anti-rotation screws, the inner side of the middle part of the upper outer sleeve is fixedly provided with the locking ring, the inner side of the locking ring is continuously provided with at least one group of inner anti-return teeth from top to bottom, the inner anti-return teeth are circular platforms with right-angled triangle sections, the circular platforms are wide at the top and narrow at the bottom, the inner side of the upper outer sleeve corresponding to the locking ring is provided with the locking mandrel, the outer side of the locking mandrel corresponding to the position between every two adjacent inner anti-return teeth is provided with the outer anti-return teeth matched with the inner anti-return teeth, and the outer anti-return teeth are circular platforms with right; an anti-rotation groove which is communicated up and down is distributed on the inner side of the lock ring along the circumference, at least one anti-rotation screw is arranged on the outer side of the locking mandrel corresponding to the anti-rotation groove, and the outer end of each anti-rotation screw is positioned in the anti-rotation groove; the outer side of the lower end of the locking mandrel is fixedly installed together with the inner side of the upper end of the straight pipe section.
5. The downhole tool with the milling and scraping functions as claimed in claim 1, 2 or 3, wherein the sliding sleeve is a hollow three-stage step shaft, the sliding sleeve comprises a limiting section, a transition section and a fixing section, the external diameters of the limiting section, the transition section and the fixing section are sequentially increased from top to bottom, the lower end of the limiting section is fixedly installed with the upper end of the transition section, and the lower end of the inner side of the milling cutter corresponding to the external position of the limiting section abuts against the upper end of the transition section; the lower end of the transition section is fixedly installed with the upper end of the fixed section, and the outer side of the middle part of the fixed section is fixedly installed with the lower part of the upper outer sleeve through a fixed shear pin; a first inner ring groove and a second inner ring groove are sequentially arranged on the inner side of the fixed section from top to bottom, the inner diameter of the first inner ring groove is smaller than that of the second outer ring groove, and inner limiting blocks are arranged in the second inner ring grooves corresponding to the positions between every two adjacent outer limiting blocks; the outer side of the lower part of the fixed section and the inner side of the lower part of the upper outer sleeve are connected and installed together through a key.
6. The downhole tool with the milling and scraping functions as claimed in claim 4, wherein the sliding sleeve is a hollow three-stage step shaft, the sliding sleeve comprises a limiting section, a transition section and a fixing section, the outer diameters of the limiting section, the transition section and the fixing section are sequentially increased from top to bottom, the lower end of the limiting section is fixedly installed with the upper end of the transition section, and the lower end of the inner side of the milling cutter corresponding to the outer side position of the limiting section is abutted against the upper end of the transition section; the lower end of the transition section is fixedly installed with the upper end of the fixed section, and the outer side of the middle part of the fixed section is fixedly installed with the lower part of the upper outer sleeve through a fixed shear pin; a first inner ring groove and a second inner ring groove are sequentially arranged on the inner side of the fixed section from top to bottom, the inner diameter of the first inner ring groove is smaller than that of the second outer ring groove, and inner limiting blocks are arranged in the second inner ring grooves corresponding to the positions between every two adjacent outer limiting blocks; the outer side of the lower part of the fixed section and the inner side of the lower part of the upper outer sleeve are connected and installed together through a key.
7. The downhole tool with the milling and scraping functions as claimed in claim 1, 2, 3 or 6, further comprising an inner ring table, an upper bearing and a lower bearing, wherein the inner ring table is arranged on the inner side of the lower end of the lower outer sleeve and located below the limit ring table, the lower bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position between the limit ring table and the inner ring table, and the upper bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position above the limit ring table; and the O-shaped sealing ring is arranged between the upper joint and the upper outer sleeve, the O-shaped sealing ring is arranged between the upper sealing ring platform and the lower sealing ring platform, the O-shaped sealing ring is arranged between the sliding sleeve corresponding to the lower position of the lower circulation hole and the upper outer sleeve, the O-shaped sealing element is arranged between the cone pipe and the sliding sleeve, and the O-shaped sealing element is arranged between the sliding sleeve corresponding to the upper position of the outer limiting block and the lower joint.
8. The downhole tool with the milling and scraping functions as claimed in claim 5, further comprising an inner ring table, an upper bearing and a lower bearing, wherein the inner ring table is arranged on the inner side of the lower end of the lower outer sleeve and located below the limit ring table, the lower bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position between the limit ring table and the inner ring table, and the upper bearing is arranged between the lower outer sleeve and the lower joint corresponding to the position above the limit ring table; and the O-shaped sealing ring is arranged between the upper joint and the upper outer sleeve, the O-shaped sealing ring is arranged between the upper sealing ring platform and the lower sealing ring platform, the O-shaped sealing ring is arranged between the sliding sleeve corresponding to the lower position of the lower circulation hole and the upper outer sleeve, the O-shaped sealing element is arranged between the cone pipe and the sliding sleeve, and the O-shaped sealing element is arranged between the sliding sleeve corresponding to the upper position of the outer limiting block and the lower joint.
9. The downhole tool with the milling and scraping function as claimed in claim 6 or 8, wherein the lower end of the lower joint and the upper end of the wall scraper are fixedly installed together through threads; the lower end of the wall scraper and the upper end of the well dredger are fixedly installed together through threads; the outer side of the lower part of the upper joint and the inner side of the upper part of the upper outer sleeve are fixedly arranged together through threads; a lock ring is fixedly arranged on the inner side of the middle part of the upper outer sleeve through threads; the inner side of the lower end of the cone section is fixedly installed with the outer side of the upper end of the sliding sleeve through threads; the outer side of the lower part of the upper outer sleeve and the lower outer sleeve are fixedly installed together through threads.
10. The downhole tool with the milling and scraping function as claimed in claim 9, wherein the outer side of the lower part of the upper joint and the inner side of the upper part of the upper outer sleeve are fixedly installed together through double-stage threads; a lock ring is fixedly arranged on the inner side of the middle part of the upper outer sleeve through sawtooth threads; the outer side of the lower part of the upper outer sleeve and the lower outer sleeve are fixedly installed together through double-stage threads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910320415.XA CN109915075B (en) | 2019-04-19 | 2019-04-19 | Downhole tool with milling and scraping functions |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910320415.XA CN109915075B (en) | 2019-04-19 | 2019-04-19 | Downhole tool with milling and scraping functions |
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| CN109915075B true CN109915075B (en) | 2021-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111894522A (en) * | 2020-07-28 | 2020-11-06 | 合力（天津）能源科技股份有限公司 | Damping hydraulic power type switchable rotary scraping sleeve milling tool |
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Inventor after: Zhu Jinfu Inventor after: Wang Qunqi Inventor after: Yang Zhenwei Inventor after: Zhang Cheng Inventor after: Yu Shijie Inventor after: Xiong Mingying Inventor before: Zhu Jinfu Inventor before: Wang Qunqi Inventor before: Yang Zhenwu Inventor before: Zhang Cheng Inventor before: Yu Shijie Inventor before: Xiong Mingying |
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