CN113374405B - Screw drill tool for fishing coiled tubing and fishing method thereof - Google Patents

Screw drill tool for fishing coiled tubing and fishing method thereof Download PDF

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Publication number
CN113374405B
CN113374405B CN202110927478.9A CN202110927478A CN113374405B CN 113374405 B CN113374405 B CN 113374405B CN 202110927478 A CN202110927478 A CN 202110927478A CN 113374405 B CN113374405 B CN 113374405B
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China
Prior art keywords
bearing
assembly
annular step
rotor
transmission shaft
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CN202110927478.9A
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Chinese (zh)
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CN113374405A (en
Inventor
孙兆岩
陆灯云
刘志尧
刘伟
管彬
张道鹏
卢秀德
陈明忠
刘刚
刘佳林
李剑秋
宋丹
罗杨
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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China National Petroleum Corp
CNPC Chuanqing Drilling Engineering Co Ltd
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Priority to CN202110927478.9A priority Critical patent/CN113374405B/en
Publication of CN113374405A publication Critical patent/CN113374405A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/02—Fluid rotary type drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • F16H2001/327—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear with orbital gear sets comprising an internally toothed ring gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/08—General details of gearing of gearings with members having orbital motion
    • F16H57/082—Planet carriers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)

Abstract

The invention provides a screw drill tool for fishing a continuous oil pipe and a fishing method thereof. The power assembly is arranged in the shell and comprises a rotor, and a first bearing assembly and a turbine blade group which are sleeved on the rotor from top to bottom. The transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft. Wherein, the power assembly is connected with the transmission assembly; or the fishing screw drill further comprises a speed reducing assembly which is coaxial with the power assembly and the transmission assembly, the speed reducing assembly is positioned in the shell and is respectively connected with the lower end of the rotor and the upper end of the transmission shaft, and the power assembly and the transmission assembly are connected through the speed reducing assembly. The screw drilling tool for fishing the coiled tubing and the fishing method thereof realize that the rotation of the rotor is constant concentric rotation; in addition, a lower rotational speed of the rotor output can be achieved.

Description

Screw drill tool for fishing coiled tubing and fishing method thereof
Technical Field
The invention relates to the technical field of oil and gas well fishing, in particular to a screw drill for fishing a continuous oil pipe and a fishing method thereof.
Background
In recent years, the workload of the bridge plug drilling and grinding operation of the shale gas continuous oil pipe is obviously increased, and the accident well that a tool string is blocked and falls is correspondingly increased, because of the defects of insufficient drill chip flowback, serious shaft sand discharge, complex well track, casing deformation and the like during bridge plug drilling and grinding; wherein casing deformation is a common cause of tool jamming and even well dropping. When the coiled tubing equipment is used for underground fishing operation, the fishing tool is difficult to smoothly grasp the fish head because the coiled tubing cannot freely rotate and the offset direction of the falling fish is not clear. Therefore, the oil pipe needs to be pulled out and lowered for many times, and different fishing tools are checked and replaced to try to salvage. The fishing efficiency is reduced, the equipment loss is increased, and the condition that the fallen fish cannot be fished even if the fallen fish is taken out for many times is avoided. How to improve the fishing success rate becomes a problem to be solved urgently.
Chinese patent application No. CN201908599U discloses a multifunctional screw drill fishing tool in 2011, 7/27, which mainly comprises a special guide shoe, a fishing barrel, an extension barrel and the like, wherein superhard wear-resistant materials are welded in four drainage water channels of the special guide shoe, and circumferential milling teeth are arranged on the conical surface of the inner wall of the guide shoe. The inner wall conical surface of the fishing barrel is provided with a tooth shape with a buckle making function, the inner diameters of the fishing barrel and the extension barrel are both larger than the outer diameter of a transmission shaft of a screw drill and the outer diameter of a screw, and the upper part of the extension barrel is connected with a matched safety joint. The fishing tool is simple to operate, labor-saving and low in use cost. But this fishing tool can't be applicable to complicated fish, and to the structure complicated fish salvage effect also relatively poor.
The fishing motor is an effective fish introduction tool. The fishing motor drives the fishing tool to rotate when the pump is started, so that the guide shoe or the shifting hook at the foremost end of the fishing tool can smoothly guide the fish head to enter the fishing tool, and the fishing success rate is improved. The conventional screw motor is designed as shown in fig. 1, and mainly comprises a power unit 100, a cardan shaft unit 200 and a transmission shaft unit 300, wherein the power unit 100 is formed by meshing a power rotor 101 and a stator 102, as shown in fig. 2, when liquid enters a sealed chamber 103, rubber is extruded to push the rotor to rotate eccentrically, and the rotor rotates to drive the cardan shaft and the transmission shaft to rotate. The average rotational speed of the existing 73mm domestic or import screw motor is 225 and 450 rpm as shown in the following table, and when the fishing tool contacts the movable fish falling head with the high rotational speed and eccentric movement, the fish is difficult to be introduced into the fishing tool.
Manufacturer of the product Outer diameter of screw Number of heads Number of stages Displacement (liter/minute) Rotating speed (rotating/minute) Maximum torsionRectangular (beef rice)
Profound distance (homemade) 73mm 5/6 4 95-490 74-384 743
Schrenbeixie (import) 73mm 5/6 2.6 227-454 138-280 894
Schrenbeixie (import) 73mm 5/6 3.5 227-454 202-410 826
National oil well (import) 73mm 5/6 3.5 225-450 186-372 430
National oil well (import) 73mm 5/6 4.7 235-470 235-470 580
BICO (import) 73mm 5/6 3.5 227-454 250-500 1490
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the objects of the present invention is to provide a coiled tubing fishing screw drill, which can achieve a constant concentric rotation by aiming at the eccentric rotation of a screw motor in the prior art, and solve the problem that it is difficult to introduce fish into a fishing tool. For another example, the invention also aims to provide a screw drill for fishing the coiled tubing, which has the output transmission shaft with low rotating speed.
In order to achieve the above purpose, the invention provides a coiled tubing fishing screw drill, which comprises a housing, and a power assembly and a transmission assembly which are coaxially arranged. The power assembly is arranged in the shell and comprises a rotor, a first bearing assembly and a turbine blade group, wherein the first bearing assembly and the turbine blade group are sleeved on the rotor from top to bottom, the first bearing assembly is fixed on the inner wall of the shell, and the turbine blade group is fixed on the rotor. The transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft, wherein the transmission shaft is inserted from the lower end of the shell, and the second bearing assembly is positioned below the turbine blade group. Wherein, the lower extreme of rotor is connected with the upper end of transmission shaft.
The invention provides a screw drill for fishing the coiled tubing, which comprises a shell, and a power assembly, a transmission assembly and a speed reduction assembly which are coaxially arranged. The power assembly is arranged in the shell and comprises a rotor, a first bearing assembly and a turbine blade group, wherein the first bearing assembly and the turbine blade group are sleeved on the rotor from top to bottom; the transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft, wherein the transmission shaft is inserted from the lower end of the shell, and the second bearing assembly is positioned below the turbine blade group; the speed reducing assembly is positioned in the shell and is respectively connected with the lower end of the rotor and the upper end of the transmission shaft.
In an exemplary embodiment of the present invention, the fishing screw drill may further include an upper joint, a lower end of which is connected to an upper end of the housing.
In an exemplary embodiment of the invention, the reduction assembly may be coaxially disposed with the power assembly and the transmission assembly, and the reduction assembly may include a sun gear, a planetary gear set, and a planetary carrier that are sequentially engaged from inside to outside. Wherein, the sun wheel is sleeved on the rotor; the planetary gear set includes at least 3 (e.g., 3-7, and as a further example, 4-5) planetary gears; the planet wheel carrier is circular and is provided with internal teeth on an inner ring, wherein the planet wheel carrier is connected with the transmission shaft.
In an exemplary embodiment of the invention, the reduction assembly may further comprise a third bearing assembly that is fitted over a gap between the planet carrier and the housing.
In an exemplary embodiment of the present invention, the transmission shaft may be provided with a key slot, and the planetary carrier may be fixed and limited on the transmission shaft by the key slot.
In an exemplary embodiment of the invention, the outer wall of the lower end of the rotor may be provided with gears distributed along the circumferential direction to form a sun gear;
the speed reducing assembly is coaxially arranged with the power assembly and the transmission assembly, the speed reducing assembly can comprise a planet gear carrier and a planet gear set which are sequentially arranged from outside to inside and are engaged with each other, wherein,
the planet wheel carrier is annular and is provided with internal teeth on an inner ring, wherein the planet wheel carrier is connected with the transmission shaft;
the planetary gear set includes at least 3 planetary gears that are each meshed with the sun gear.
In an exemplary embodiment of the invention, the shaft body of the transmission shaft may be formed with a first annular step and a second annular step from top to bottom, and an outer diameter of the first annular step is smaller than an outer diameter of the second annular step. The second bearing assembly may include a first bearing and a second bearing. Wherein, the first bearing is sleeved on the first annular step; the second bearing is sleeved on the second annular step, and the outer wall of the second bearing is connected with the shell.
In an exemplary embodiment of the present invention, the housing includes a first housing, a second housing, and a third housing connected from top to bottom. The power assembly is arranged in the first shell, the first bearing is arranged in the second shell, the inner wall of the second shell is provided with a third annular step, and the third annular step is matched with the first annular step to form a cavity capable of accommodating the first bearing; the second bearing is installed in the third casing, and fourth annular step has been seted up to the inner wall of third casing, the fourth annular step with the cooperation of second annular step forms the cavity that can hold the second bearing.
In an exemplary embodiment of the invention, the second bearing assembly may further comprise a third bearing disposed below the first bearing and disposed in a cavity formed by the third annular step and the first annular step.
In an exemplary embodiment of the invention, the third bearing may comprise a string bearing housing and a number of (e.g., 2-8, and as a further example, 4-6) rotating balls, and the string bearing housing may be of cemented carbide design.
In an exemplary embodiment of the present invention, the surfaces of the first bearing and the second bearing may be coated with a cemented carbide wear-resistant material, and the turbine blade assembly may be of a cemented carbide design.
In an exemplary embodiment of the present invention, the upper end of the rotor may further be provided with a first cavity, the first cavity forms an upper opening on the upper end surface of the rotor, the cavity wall of the first cavity is further provided with a plurality of first through holes, and the first through holes can communicate the first cavity with the outside.
In an exemplary embodiment of the present invention, the lower end of the rotor may further be provided with a second cavity, the second cavity forms a lower opening on the lower end surface of the rotor, the cavity wall of the second cavity is further provided with a plurality of second through holes, and the second through holes can communicate the second cavity with the outside.
In an exemplary embodiment of the invention, the lower end of the drive shaft is located outside the housing and the lower end of the drive shaft is connected to a fishing tool.
In another aspect, the invention provides a coiled tubing fishing screw drill tool, which is used for fishing coiled tubing.
Compared with the prior art, the beneficial effects of the invention can comprise at least one of the following:
1) the power assembly is designed by adopting the turbine blades, compared with the power assembly of the traditional stator rubber, the rotor rotates more stably, a universal shaft is not needed, and the structure of the screw drilling tool is simpler;
2) the turbine blade adopted by the invention can realize the constant concentric rotation of the rotor, and the reliability of the screw drill for fishing the coiled tubing is improved;
3) the invention can also be provided with a speed reduction assembly, and the speed reduction assembly can enable liquid to flow through the turbine blades to drive the rotor to rotate and then output a lower rotating speed (for example, 20-40 r/min), so that the fishing tool connected with the transmission shaft is driven to rotate, and the fallen fish head is guided to enter the fishing tool.
Drawings
Fig. 1 is a schematic view showing a structure of a conventional screw motor in the background art;
FIG. 2 is a schematic cross-sectional view of a prior art power rotor and stator mesh configuration;
FIG. 3 shows a schematic view of the structure of a coiled tubing fishing screw drill according to exemplary embodiment 2 of the present invention;
FIG. 4 is a cross-sectional structural view taken along line A-A of FIG. 3;
fig. 5 shows a radial cross-sectional schematic view of a turbine blade group of exemplary embodiment 2 of the present invention.
The reference numerals are explained below:
1-shell, 11-first shell, 12-second shell, 12 a-third annular step, 13-third shell, 13 a-fourth annular step; 2-power train, 21-rotor, 21 a-first cavity, 21 b-first through hole, 21 c-second cavity, 21 d-second through hole, 22-first bearing assembly, 23-turbine blade set; 3-reduction assembly, 31-sun gear, 32-planetary gear set, 33-planet carrier, 34-third bearing set; 4-drive assembly, 41-drive shaft, 41 a-first annular step, 41 b-second annular step, 42-second bearing assembly, 421-first bearing, 422-second bearing, 423-third bearing; 5-upper joint; 6-stopping sleeve; 71-a first locking sleeve, 72-a second locking sleeve, 73-a third locking sleeve; 81-a first spacer, 82-a second spacer, 83-a third spacer; 9-fishing tool; 100-power unit, 200-cardan shaft unit, 300-propeller shaft unit, 101-power rotor, 102-stator, 103-sealed chamber.
Detailed Description
Hereinafter, the coiled tubing fishing screw drill and the fishing method thereof of the present invention will be described in detail with reference to exemplary embodiments. Herein, the terms "first," "second," "third," and the like are used for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance or order of parts.
Exemplary embodiment 1
A coiled tubing fishing screw drill (which can be simply referred to as a screw drill) can comprise a shell, and a power assembly and a transmission assembly which are coaxially arranged.
The power assembly is arranged in the shell and comprises a rotor, and a first bearing assembly and a turbine blade group which are sleeved on the rotor from top to bottom. Wherein the first bearing assembly is secured to the inner wall of the housing and the turbine blade assembly is secured to the rotor.
The transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft. Wherein the drive shaft is inserted from a lower end of the housing, the lower end of the drive shaft is located outside the housing, and the second bearing assembly is located below the turbine blade assembly.
The power assembly and the transmission assembly can be connected in two ways. In the first mode, the lower end of the rotor is directly connected with the upper end of the transmission shaft, and the rotating speed of the rotor can be directly output to the transmission shaft; in a second mode, the screw drill further comprises a speed reduction assembly, the speed reduction assembly is located in the shell and is respectively connected with the lower end of the rotor and the upper end of the transmission shaft, namely, the speed reduction assembly is arranged to connect the power assembly and the transmission assembly, and the rotating speed of the rotor needs to be output to the transmission shaft through the speed reduction assembly.
When the screw drill disclosed by the invention is used for fishing operation, liquid flows through the turbine blade group to drive the rotor to rotate, and the rotor rotates to drive (or drives through the speed reduction assembly) the fishing tool connected with the transmission shaft to rotate, so that the falling fish head is guided to enter the fishing tool. The turbine blades adopted by the screw drilling tool can realize the constant concentric rotation of the rotor, and the use reliability of the screw drilling tool is improved.
Exemplary embodiment 2
The coiled tubing fishing progressive cavity drill may include a housing 1 as shown in fig. 3, and a power assembly 2, a speed reduction assembly 3 and a transmission assembly 4 coaxially disposed.
In the present embodiment, the powertrain 2 is mounted in the housing 1 and includes a rotor 21, and a first bearing assembly 22 and a turbine blade assembly 23 that are sleeved on the rotor from top to bottom.
Wherein the first bearing assembly 22 is fixed to the inner wall of the housing 1. The first bearing assembly 22 may right the rotor 21 to achieve a smoother rotation of the rotor.
The turbine blade set 23 is fixed to the rotor 21, and as shown in fig. 5, the turbine blade set 23 may include at least one turbine blade that is capable of rotating when a liquid (e.g., water) flows therethrough and rotates the rotor 21. The turbine blades may be of cemented carbide design to improve their wear resistance and service life.
A keyway (not shown) may be provided on the rotor 21 by which the first bearing assembly 22 and turbine blade assembly 23 may be secured and restrained on the rotor 21. In the present invention, the arrangement of the key slot (including the key) can also be a common way in the art, and will not be described herein. The first locking sleeve 71 can also be sleeved on the upper end of the rotor 21 above the first bearing assembly 22, and the first bearing assembly 22 is limited and fixed in an axial compression mode. The rotor 21 may be sleeved with a second locking sleeve 72 below the first bearing assembly 22 and above the turbine blade assembly 23, the second locking sleeve 72 may be provided with an axially increasing limiting step to fix the inner ring portion of the turbine blade assembly 23 in an axially pressing manner, and a first spacer 81 may be arranged inside the inner wall of the casing 1 corresponding to the turbine blade assembly 23 to fix the outer ring portion of the turbine blade assembly 23 in an axially pressing manner.
The upper end of the rotor 21 can be further provided with a first cavity 21a, the first cavity 21a forms an upper opening on the upper end surface of the rotor 21, the cavity wall of the first cavity 21a is further provided with a plurality of first through holes 21b in a penetrating manner, and the first through holes 21b can communicate the first cavity 21a with the outside, that is, after the liquid flows into the first cavity 21a from the upper opening, the liquid can flow out through the first through holes 21 b. For example, the cavity wall of the first cavity 21a is uniformly provided with 8 through holes, so that the liquid can flow out of the first cavity 21 a.
The lower end of the rotor 21 can be further provided with a second cavity 21c, the second cavity 21c forms a lower opening on the lower end face of the rotor 21, the cavity wall of the second cavity 21c is further provided with a plurality of second through holes 21d in a penetrating manner, the second through holes 21d can communicate the second cavity 21c with the outside, that is, after liquid flows into the second cavity 21c through the second through holes 21d, the liquid can flow out from the lower opening. For example, the cavity wall of the second cavity 21c is uniformly provided with 8 through holes, so that the liquid can flow to the second cavity 21c from the 8 through holes.
In the present embodiment, the transmission assembly 4 includes a transmission shaft 41 and a second bearing assembly 42 fitted over the transmission shaft 41.
The transmission shaft 41 is inserted from the lower end of the housing 1, the lower end of the transmission shaft 41 is located outside the housing, and the fishing tool 9 can be connected to the lower end of the transmission shaft 41. The transmission shaft 41 is sequentially formed with a first annular step 41a and a second annular step 41b from top to bottom along a radial direction, that is, the shaft body of the transmission shaft 41 is provided with the first annular step 41a and the second annular step 41b from top to bottom, and the outer diameter of the transmission shaft 41 at the first annular step 41a is smaller than the outer diameter of the transmission shaft 41 at the second annular step 41 b. The transmission shaft 41 axially penetrates through a flow passage through which liquid flows, the upper end of the flow passage is communicated with the lower opening of the second cavity 21c, and the liquid can flow from the second cavity 21c to the flow passage of the transmission shaft 41. The transmission shaft 41 can transmit the power and the rotating speed generated by the turbine blade group 23 to the fishing tool 9 connected to the lower end of the transmission shaft 41, and the fishing tool 9 rotating at a low speed can slowly sleeve the fallen fish, so that fishing is finally realized.
The second bearing assembly 42 is located below the turbine blade group 23, and the second bearing assembly 42 includes a first bearing 421 and a second bearing 422. The first bearing 421 is sleeved on the first annular step 41a of the transmission shaft 41, a third locking sleeve 73 is sleeved on the transmission shaft 41 on the first bearing 421, a limit step can be added to the third locking sleeve 73 in the axial direction of the transmission shaft 41, and the first bearing 421 is fixed in an axial compression manner. The second bearing 422 is sleeved on the second annular step 41b of the transmission shaft 41, the outer wall of the second bearing 422 is connected with the housing 1, and the end surface of the lower end of the second bearing 422 is connected with the lower end surface of the second annular step 41 b. For example, the first bearing 421 and the second bearing 422 may be TC bearings (hard alloy radial bearings), and may be divided into an inner ring and an outer ring, and the second bearing 422 may include an outer ring (stationary ring) and an inner ring (moving ring), the outer wall of the outer ring may be fixed to the housing 1 in an axial compression manner, and the lower end of the inner ring may be connected to the lower end surface of the second annular step 41b by welding or shrink fitting (interference fit). The surfaces of the first bearing 421 and the second bearing 422 may be coated with a hard alloy wear-resistant material to improve wear resistance and temperature resistance.
In the present embodiment, the housing 1 includes a first housing 11, a second housing 12, and a third housing 13 connected from top to bottom.
The power assembly 2 is installed in the first housing 11, the first bearing 421 is installed in the second housing 12, a third annular step 12a is formed on the inner wall of the second housing 12, the third annular step 12a and the first annular step 41a are matched to form a cavity capable of accommodating the first bearing 421, and the third annular step 12a and the first annular step 41a in the cavity can press the first bearing 421; the second bearing 422 is installed in the third housing 13, a fourth annular step 13a is opened on the inner wall of the third housing 13, and the fourth annular step 13a and the second annular step 41b are matched to form a cavity capable of accommodating the second bearing 422.
In this embodiment, the second bearing assembly 42 further includes a third bearing 423, the third bearing 423 is disposed in the cavity formed by the third annular step 12a and the first annular step 41a and below the first bearing 421, and the first bearing and the third bearing are axially pressed in the cavity formed by the third annular step 12a and the first annular step 41 a. The third bearing may comprise a series of bearing housings and a plurality of rotating balls, and the third annular step 12a cooperates with the first annular step 41a to axially compress the first bearing 421 and the third bearing 423. The size of the bearing housing of the third bearing and the number of the rotating balls can be changed, and the first bearing can be arranged in the remaining space behind the third annular step 12a and the first annular step 41a according to the third bearing, and the axial length of the first bearing 421 arranged on the transmission shaft 41 or the number of the bearings can be adjusted, that is, the third bearing 423 is firstly arranged in the inner cavity formed by the cooperation of the third annular step 12a and the first annular step 41a, and the first bearing 421 can flexibly determine the size required by the first bearing 421 or the number of the bearings arranged according to the remaining space in the inner cavity. The tandem bearing housing of the third bearing 423 may be of cemented carbide design, and the surface of the rotating ball may be hardened to improve wear resistance and service life.
In this embodiment, when the screw drill performs a fishing operation, the first bearing 421 and the second bearing set 422 can radially center the drive shaft 41, and the third bearing 423 can axially receive a weight on the drive shaft 41.
In addition, in the present embodiment, the screw drill may further include an upper joint 5, a lower end of the upper joint 5 is connected with an upper end of the housing 1, and an end surface of the lower end of the upper joint 5 is pressed against an outer ring of the first bearing assembly 22, and an inner surface of the upper end of the housing 1 may be provided with a limit step. For example, the lower end of the upper joint 5 is screwed with the upper end of the housing 1, the first bearing assembly 22 is a roller bearing, the end face of the screw thread of the upper joint 5 presses the first bearing assembly 22, and the first bearing assembly 22 can be fixed by matching with the limit step arranged on the housing 1.
Exemplary embodiment 3
On the basis of the above exemplary embodiment 2, as shown in fig. 3 and 4, the reduction assembly 3 is disposed coaxially with the power assembly 2 and the transmission assembly 4, and the reduction assembly 3 may include the sun gear 31, the planetary gear set 32, and the carrier 33 that are engaged from inside to outside in this order as shown in fig. 4. It should be noted that when the speed reduction assembly 3 is provided, the power assembly 2 and the transmission assembly 4 are not directly connected.
Wherein the sun gear 31 is sleeved on the rotor 21. The planetary gear set 32 includes at least 3 planetary gears. The planetary gear set 32 may also be constituted by two or three rows and more of planetary gears, for example, as shown in fig. 4, the planetary gear set 32 includes 3 planetary gears evenly distributed that mesh with the sun gear 31 and the carrier 33, respectively. The planet carrier 33 is circular and has internal teeth on the inner ring, wherein the planet carrier 33 is connected with the transmission shaft 41, for example, a key slot can be arranged on the transmission shaft 41, and the planet carrier 33 is fixed and limited on the transmission shaft 41 by means of a key and the key slot. The deceleration assembly 3 may also be of other conventional structures in the art, and will not be described herein in any greater detail.
In addition, a retaining sleeve 6 can be arranged below the sun gear 31, the retaining sleeve 6 is sleeved at the lower end of the rotor, and the retaining sleeve 6 can axially block the planetary gear set 32 to prevent the planetary gear from axially disengaging from the sun gear 31 and the planetary carrier 33.
In this embodiment, the reduction assembly 3 may further comprise a third bearing assembly 34, the third bearing assembly 34 being fitted in the gap between the planet wheel carrier 33 and the housing 1. The housing 1 (e.g., the first housing 11 in fig. 3) may be formed with a limit step and the third bearing assembly 34 is axially compressed against the housing 1. The third bearing assembly 34 may comprise two roller bearings axially compressed by the second and third spacers 82, 83 as shown in fig. 3, and may also comprise an outer ring (stationary ring) whose outer wall is fixed to the housing 1 by axial compression and an inner ring (moving ring) whose lower end is connected to the lower end of the carrier 33 by welding or shrink fitting (e.g. interference fit).
The design of the speed reduction assembly can effectively convert the high-speed rotation of the rotor 21 into a lower rotation speed (for example, 20-40 r/min) output to the transmission shaft 41, and compared with the higher rotation speed (as shown in the table of the background art) in the prior art, the falling fish can be more easily introduced into the fishing tool 9.
In this embodiment, a key groove may be provided on the transmission shaft 41, and the sun gear 31 is fixed and limited on the transmission shaft 41 through the key groove.
Exemplary embodiment 4
The coiled tubing fishing screw drill of the present exemplary embodiment may be substantially the same as exemplary embodiment 3. The difference lies in that:
the outer wall of the lower end of the rotor is provided with gears distributed along the circumferential direction to form a sun gear. That is, the gears distributed along the circumferential direction are machined and arranged on the outer wall of the lower end of the rotor to form the sun gear, namely, the rotor can directly act as the sun gear.
The speed reducing assembly is coaxially arranged with the power assembly and the transmission assembly, and comprises a planet gear carrier and a planet gear set which are sequentially arranged from outside to inside and are engaged with each other. The planet wheel carrier is annular, the inner ring is provided with inner teeth, and the planet wheel carrier is connected with the transmission shaft; the planetary gear set includes at least 3 planetary gears that are each meshed with the sun gear.
The operation principle of the coiled tubing fishing screw drill according to the present invention for performing coiled tubing fishing operation will be described below with reference to fig. 3. It should be noted that the progressive cavity drill shown in fig. 3 is the preferred configuration of the present invention and those skilled in the art will recognize that certain components or configurations may be omitted or substituted.
Introducing a liquid (e.g., clean water), wherein the liquid flows from the upper joint 5 to the power assembly 2, and a part of the liquid flows from the first bearing assembly 22 to the turbine blade assembly 23, and the other part of the liquid flows from the upper end of the rotor 21 to the first cavity 21a and then flows to the turbine blade assembly 23 through the first through hole 21 b; the liquid flows through the turbine blade assembly 23, flows through the second through hole 21d to the second cavity 21c, and is discharged through the flow passage of the transmission shaft 41. When the liquid flows through the turbine blade group 23, the liquid rotates and drives the rotor 21 to rotate, the rotor 21 transmits the rotating speed to the planet wheel carrier 33 of the speed reducing assembly 3, the rotation of the rotor 21 is reduced through the structure of the speed reducing assembly 3, and the rotating speed is output to the transmission shaft 41. The fishing tool 9 connected with the transmission shaft 41 can slowly sleeve the fallen fish under the rotation drive of the transmission shaft, so as to realize fishing.
In conclusion, the screw drill for fishing the coiled tubing and the fishing method thereof have the beneficial effects that at least one of the following items is included:
1) the screw drill has a simple structure, does not need a universal shaft any more, and is reasonable in design;
2) compared with the traditional power assembly design of stator rubber, the power assembly design adopts the turbine blades, and the eccentric rotation is changed into constant concentric rotation;
3) the setting of speed reduction assembly for the rotor exports a lower rotational speed to the transmission shaft, thereby drives the fishing tool rotation of transmission shaft sub-unit connection, can guide the fish head of falling to get into fishing tool more easily.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.

Claims (15)

1. A coiled tubing salvage screw drill is characterized by comprising a shell, a power assembly and a transmission assembly which are coaxially arranged, wherein,
the power assembly is arranged in the shell and comprises a rotor, a first bearing assembly and a turbine blade group, wherein the first bearing assembly and the turbine blade group are sleeved on the rotor from top to bottom;
the transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft, wherein the transmission shaft is inserted from the lower end of the shell, and the second bearing assembly is positioned below the turbine blade group;
wherein, the lower end of the rotor is connected with the upper end of the transmission shaft;
the shaft body of the transmission shaft is provided with a first annular step and a second annular step from top to bottom, and the outer diameter of the first annular step is smaller than that of the second annular step; the second bearing assembly comprises a first bearing and a second bearing, wherein the first bearing is sleeved on the first annular step; the second bearing is sleeved on the second annular step, and the outer wall of the second bearing is connected with the shell.
2. A screw drill for fishing coiled tubing is characterized by comprising a shell, a power assembly, a transmission assembly and a deceleration assembly which are coaxially arranged, wherein,
the power assembly is arranged in the shell and comprises a rotor, a first bearing assembly and a turbine blade group, wherein the first bearing assembly and the turbine blade group are sleeved on the rotor from top to bottom;
the transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft, wherein the transmission shaft is inserted from the lower end of the shell, and the second bearing assembly is positioned below the turbine blade group;
the speed reducing assembly is positioned in the shell and is respectively connected with the lower end of the rotor and the upper end of the transmission shaft;
the speed reduction assembly is coaxially arranged with the power assembly and the transmission assembly, and comprises a sun gear, a planetary gear set and a planet gear carrier which are sequentially meshed from inside to outside, wherein the sun gear is sleeved on the rotor; the planetary gear set includes at least 3 planet gears; the planet wheel carrier is annular and is provided with internal teeth on an inner ring, wherein the planet wheel carrier is connected with the transmission shaft;
the shaft body of the transmission shaft is provided with a first annular step and a second annular step from top to bottom, and the outer diameter of the first annular step is smaller than that of the second annular step; the second bearing assembly comprises a first bearing and a second bearing, wherein the first bearing is sleeved on the first annular step; the second bearing is sleeved on the second annular step, and the outer wall of the second bearing is connected with the shell.
3. The coiled tubing fishing screw drill according to claim 1 or 2, further comprising an upper joint, wherein the lower end of the upper joint is connected with the upper end of the housing.
4. The coiled tubing fishing progressive cavity drill of claim 2, wherein the deceleration assembly further comprises a third bearing assembly disposed in a gap between the carrier and the housing.
5. The coiled tubing fishing screw drill according to claim 2, wherein the transmission shaft is provided with a key groove, and the planet wheel carrier is fixed and limited on the transmission shaft through the key groove.
6. A coiled tubing salvage screw drill is characterized by comprising a shell, a power assembly and a transmission assembly which are coaxially arranged, wherein,
the power assembly is arranged in the shell and comprises a rotor, a first bearing assembly and a turbine blade group, wherein the first bearing assembly and the turbine blade group are sleeved on the rotor from top to bottom;
the transmission assembly comprises a transmission shaft and a second bearing assembly sleeved on the transmission shaft, wherein the transmission shaft is inserted from the lower end of the shell, and the second bearing assembly is positioned below the turbine blade group;
wherein, the lower end of the rotor is connected with the upper end of the transmission shaft;
the shaft body of the transmission shaft is provided with a first annular step and a second annular step from top to bottom, and the outer diameter of the first annular step is smaller than that of the second annular step; the second bearing assembly comprises a first bearing and a second bearing, wherein the first bearing is sleeved on the first annular step; the second bearing is sleeved on the second annular step, and the outer wall of the second bearing is connected with the shell
The outer wall of the lower end of the rotor is provided with gears distributed along the circumferential direction to form a sun gear;
the speed reducing assembly is coaxially arranged with the power assembly and the transmission assembly, the speed reducing assembly comprises a planet gear carrier and a planet gear set which are sequentially arranged from outside to inside and are engaged with each other, wherein,
the planet wheel carrier is annular and is provided with internal teeth on an inner ring, wherein the planet wheel carrier is connected with the transmission shaft;
the planetary gear set includes at least 3 planetary gears that are each meshed with the sun gear.
7. The coiled tubing fishing progressive cavity drill of claim 6, wherein the deceleration assembly further comprises a third bearing assembly disposed in a gap between the carrier and the housing.
8. The coiled tubing fishing progressive cavity drill of claim 1, 2 or 6, wherein the housing comprises a first housing, a second housing and a third housing connected from top to bottom, wherein,
the power assembly is arranged in the first shell, the first bearing is arranged in the second shell, the inner wall of the second shell is provided with a third annular step, and the third annular step is matched with the first annular step to form a cavity capable of accommodating the first bearing;
the second bearing is installed in the third casing, and fourth annular step has been seted up to the inner wall of third casing, the fourth annular step with the cooperation of second annular step forms the cavity that can hold the second bearing.
9. The coiled tubing fishing progressive cavity drill of claim 8, wherein the second bearing assembly further comprises a third bearing disposed below the first bearing and disposed in a cavity formed by the third annular step and the first annular step.
10. A coiled tubing fishing screw drill as claimed in claim 9, wherein the third bearing comprises a cluster bearing housing and a plurality of rolling balls, the cluster bearing housing being of cemented carbide design.
11. The coiled tubing fishing screw drill tool of claim 1, 2 or 6, wherein the surfaces of the first bearing and the second bearing are coated with hard alloy wear-resistant materials, and the turbine blade set is designed by using hard alloy.
12. The coiled tubing salvage screw drill tool as claimed in claim 1, 2 or 6, wherein the upper end of the rotor is further provided with a first cavity, the upper end face of the rotor of the first cavity is provided with an upper opening, the cavity wall of the first cavity is further provided with a plurality of first through holes, and the first through holes can communicate the first cavity with the outside.
13. The coiled tubing salvage screw drill tool as claimed in claim 1, 2 or 6, wherein a second cavity is further formed at the lower end of the rotor, a lower opening is formed in the lower end face of the rotor by the second cavity, a plurality of second through holes are further formed in the cavity wall of the second cavity, and the second through holes can communicate the second cavity with the outside.
14. The coiled tubing fishing progressive cavity drill of claim 1, 2 or 6 wherein the lower end of the drive shaft is located outside the housing and the lower end of the drive shaft is connected to a fishing tool.
15. A method of fishing a coiled tubing fishing screw drill according to claim 1, 2 or 6, wherein the coiled tubing fishing screw drill is used for fishing coiled tubing.
CN202110927478.9A 2021-08-13 2021-08-13 Screw drill tool for fishing coiled tubing and fishing method thereof Active CN113374405B (en)

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