CN109162642B - Power guiding casing pipe running device for inclined hole section of weak stratum - Google Patents
Power guiding casing pipe running device for inclined hole section of weak stratum Download PDFInfo
- Publication number
- CN109162642B CN109162642B CN201811096535.8A CN201811096535A CN109162642B CN 109162642 B CN109162642 B CN 109162642B CN 201811096535 A CN201811096535 A CN 201811096535A CN 109162642 B CN109162642 B CN 109162642B
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- hole
- joint
- drill bit
- transmission shaft
- shell
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- 230000005540 biological transmission Effects 0.000 claims abstract description 41
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 238000005452 bending Methods 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 7
- 230000000694 effects Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- 239000002893 slag Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000007667 floating Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
- E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The utility model provides a power direction is casing pipe device under for weak stratum makes inclined hole section, including being used for guiding the direction hole drilling head of casing, provide the screw motor of boring power, the crooked deformation drilling rod of guide sleeve, locking or unblock sheathed tube recoverable seat seal ware, wherein, the screw motor is through the direction hole drilling bit of the guide hole drilling bit of transmission shaft drive hollow structure, the screw motor upper end is connected deformation drilling rod lower extreme through directional joint, but deformation drilling rod upper end is connected recoverable seat seal ware's lower joint through seat seal ware joint, recoverable seat seal ware is equipped with the center tube, the mud that lets in by the center tube can circulate to the direction hole drilling bit, and discharge by the bottom of direction hole drilling bit. The invention has the functions of hole bottom power slag removal, angle measurement while drilling and guiding the bending of the high-rigidity sleeve. The problem of weak stratum large curvature inclined hole casing running which cannot be realized by the conventional technology is solved, the requirements of stratum casing running drilling with poor geological conditions and poor geological conditions can be met, and the method has good application prospect.
Description
Technical Field
The invention relates to a geological drilling device, in particular to a power-guided casing running device for a weak stratum inclined hole section, and belongs to the technical field of drilling.
Background
At present, a plurality of casing running methods exist in petroleum and geological exploration drilling processes, but the prior art cannot be suitable for casing running of weak stratum and large-curvature inclined hole section. The weak stratum is a geological layer formed by special soil such as soft soil, mucky soil, mixed soil, miscellaneous fill and the like, and the physical and mechanical properties of the weak stratum are low. The prior art can not solve the difficulty that the inclined hole section is put into the sleeve pipe due to the large curvature of the weak stratum as follows: 1. the vertical depth of the shallow horizontal well is small, and the vertical drilling distance is short, so that the vertical drilling distance needs to be changed into the horizontal drilling distance, the curvature of the deflecting section is large, the rigidity of the sleeve for protecting the wall is large, and the sleeve cannot be directly bent by the traction of the floating hoops and the floating shoes in the inclined hole with the large curvature to enter the inclined hole section; 2. the existing casing running technology cannot finish slag removal, so that the drill bit is blocked by the slag.
Disclosure of Invention
The invention aims to provide a power guiding casing running device with functions of hole bottom power slag removal, guiding large-rigidity casing bending and drilling tool recovery, which is used for making inclined hole sections in weak stratum.
The problems of the invention are solved by the following technical proposal:
a power-guided casing running device for a hole section of a weak stratum, comprising the following components arranged from bottom to top: the device comprises a guide hole repairing drill bit for guiding a lower sleeve, a screw motor for providing drilling power, a deformed drill rod for guiding the bending of the sleeve and a recoverable seat sealer for locking or unlocking the sleeve, wherein the screw motor drives a guide hole repairing drill bit of a hollow structure through a transmission shaft, the upper end of the screw motor is connected with the lower end of the deformed drill rod through a directional connector, the upper end of the deformed drill rod is connected with a lower connector of the recoverable seat sealer through a seat sealer connector, the recoverable seat sealer is provided with a central pipe, slurry introduced into the central pipe can flow to the guide hole repairing drill bit, and the slurry is discharged from the bottom end of the guide hole repairing drill bit.
According to the power-guided casing running device for the inclined hole section of the weak stratum, the deformed drill rod is an elongated rod with a hollow structure, the length of the deformed drill rod is equal to that of a single conventional drill rod, the outer diameter of the deformed drill rod is 0.5-0.8 times of the inner diameter of the guided casing running into the deformed drill rod, and the MWD measurement while drilling instrument is arranged in the deformed drill rod.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum comprises a central pipe, an outer shell, a lower core pipe, an upper joint, a lower joint and a locking mechanism, wherein the upper end and the lower end of the outer shell are respectively connected with the upper joint and the lower joint, and the central pipe is in sliding fit with the upper joint; the locking mechanism is provided with a sliding body and a tooth block, the sliding body is in sliding fit with the shaft hole of the outer shell, the tooth block is arranged in a chute of the sliding body, the tooth block corresponds to a tooth block window arranged on the outer shell wall, the upper end and the lower end of the sliding body are respectively connected with the lower end of the central tube and the upper end of the lower core tube, and the lower core tube is in sliding fit with the shaft hole of the lower joint.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum is characterized in that the tooth block is wedge-shaped, the surface, which is contacted with the bottom surface of the chute, of the tooth block is provided with an inclined angle matched with the bottom surface of the chute, the cross section of the chute is in a dovetail groove shape, the tooth block is matched and inserted in the chute, the outer surface of the tooth block is an arc surface, and the outer surface of the tooth block is provided with insections.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum is provided with the anti-falling ring which is in threaded connection with the central pipe and is positioned between the upper joint and the sliding body.
The power guiding casing pipe feeding device for the inclined hole section of the weak stratum is characterized in that the guiding hole repairing drill bit consists of a conical guiding section and a cylindrical gauge section, a slurry returning groove is formed in the periphery of the guiding hole repairing drill bit, and an up-down penetrating drill bit center hole is formed in the guiding hole repairing drill bit.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum comprises a stator, a rotor, a universal shaft, a bent shell and a transmission mechanism, wherein the transmission mechanism is provided with a transmission shaft, a lower shell and a bearing group of a hollow structure, the upper end and the lower end of the universal shaft are respectively connected with the rotor and the transmission shaft, the upper end and the lower end of the bent shell are respectively connected with the stator and the lower shell, the universal shaft is positioned in the bent shell, the transmission shaft is a hollow shaft, the transmission shaft is positioned in the bent shell and the lower shell, the bending degree of the bent shell is 3-4 degrees, and the stage number of the screw motor is 1-2.5 stages.
The power guiding sleeve pipe-feeding device for the inclined hole section of the weak stratum is characterized in that a transmission shaft side hole for feeding mud into the transmission shaft is arranged at the upper part of the transmission shaft.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum is characterized in that the bearing group is positioned between the lower shell and the transmission shaft, and the transmission shaft bearing group comprises an upper TC bearing, a lower TC bearing and a thrust bearing positioned between the upper TC bearing and the lower TC bearing.
The power guiding sleeve pipe-down device for the inclined hole section of the weak stratum is characterized in that the upper end of the central pipe extends out of the upper joint, and the upper end of the central pipe is provided with internal threads.
The device is a casing running device for shallow horizontal well drilling, and has the functions of hole bottom power slag removal, angle measurement while drilling and large-rigidity casing bending guiding. Compared with the prior art, the invention has the following characteristics: the mud pumped into the device makes the screw motor rotate to provide rotary power for the guide hole repairing drill bit, and the flowing mud flushes the hole bottom, and the sediment at the hole bottom is returned to the outside of the hole, so that the downward resistance of the deflecting section is reduced; the slender rod structure of the deformed drill rod has small rigidity and is easy to bend, and the sleeve with high rigidity can be brought into the deflecting section to finish the insertion of the sleeve in the deflecting section; the hole repairing drill bit can replace the traditional floating shoe function and can complete hole repairing in the drilling process; the recoverable seat sealer reliably locks the casing in the drilling process, so that the casing and the drilling tool move together; after the sleeve is lowered into place, the locking mechanism is unlocked, and the drilling tool can be retracted. The problems of inclined hole casing caused by the large curvature of the weak stratum which cannot be realized by the conventional technology are solved by organically combining the parts, the requirements of casing drilling of the stratum with poor geological conditions and particularly poor geological conditions can be met, and the method has good application prospect.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of a screw motor;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic structural view of a transmission mechanism;
FIG. 5 is a schematic view of the structure of the recyclable seat sealer;
FIG. 6 is a perspective view of a dental block;
FIG. 7 is a schematic view of the structure of the slider;
FIG. 8 is a bottom view of FIG. 7;
FIG. 9 is a schematic view of the pilot hole-repairing drill;
fig. 10 is a bottom view of fig. 9.
The reference numerals in the figures are: 1. 1-1 parts of guide hole repairing drill bit, 1-2 parts of gauge section, 1-3 parts of guide section, slurry returning groove, 1-4 parts of drill bit center hole, 2 parts of screw motor, 2-1 parts of stator, 2-2 parts of rotor, 2-3 parts of universal shaft, 2-4 parts of bent shell, 2-5 parts of upper TC bearing, 2-6 parts of thrust bearing, 2-7 parts of lower TC bearing, 2-8 parts of lower shell, 2-9 parts of transmission shaft, 2-10 parts of transmission shaft side hole, 3 parts of directional joint, 4 parts of deformed drill rod, 5 parts of MWD measurement while drilling instrument, 6 parts of seat sealer joint, 7 parts of recoverable seat sealer, 7-1 parts of center pipe, 7-2 parts of upper joint, 7-3 parts of outer shell, 7-3-1 parts of tooth block window, 7-4 parts of anti-drop ring, 7-5 parts of sliding body, 7-5-1 parts of chute, 7-6 parts of tooth block, 7-7 parts of lower core pipe, 7-8 parts of lower joint, 8 parts of sleeve, 9 parts of sleeve joint.
Detailed Description
Referring to fig. 1, the casing running device of the present invention comprises the following components from bottom to top: the guide hole repairing drill bit 1 is used for replacing a floating shoe to guide a lower casing, the screw motor 2 is used for providing drilling power for the lower casing, the deformed drill rod 4 is used for guiding the casing to be bent at an angle, and the recoverable seat sealer 7 is used for locking or unlocking the casing. The screw motor drives the guide hole repairing drill head of the hollow structure to rotate through the driving shaft, the upper end of the screw motor is connected with the lower end of the deformed drill rod through the directional connector 3, the upper end of the deformed drill rod is connected with the lower connector of the recyclable seat sealer through the seat sealer connector 6, the recyclable seat sealer is provided with a central pipe, slurry introduced into the central pipe can circulate to the guide hole repairing drill head, and the slurry is discharged from the bottom end of the guide hole repairing drill head. The deformed drill rod 4 is an elongated rod with a hollow structure, the hollow structure is used for introducing slurry, and the elongated structure is used for ensuring small rigidity and easy deformation of the deformed drill rod and can smoothly bring a sleeve into a deflecting hole section. The length of the deformed drill rod is a single length of conventional drill rod (typically 10 meters), the outer diameter of the deformed drill rod is 0.5-0.8 times the inner diameter of the guided casing, and a MWD while drilling meter 5 is provided within the deformed drill rod. The angular deviation between the drill bit and the borehole may be detected by an MWD measurement while drilling instrument before the pilot reamer bit enters the production string.
Referring to fig. 1 to 4, a screw motor 2 is composed of a stator 2-1, a rotor 2-2, a universal shaft 2-3, a transmission shaft 2-9, a bent housing 2-4, and a transmission mechanism; the transmission mechanism is provided with a transmission shaft 2-9 with a hollow structure, a lower shell 2-8 and a bearing group. The upper end of the stator is connected with the directional joint, the lower end of the stator is connected with the bent shell, and the rotor is positioned in the stator. The lower end of the bent shell is connected with the lower shell. One end of the universal shaft is connected with the rotor, the other end of the universal shaft is connected with the transmission shaft, the transmission shaft is of a hollow structure, and the upper part of the transmission shaft is provided with transmission shaft side holes 2-10 for introducing mud into the transmission shaft. The slurry drives the rotor to rotate, and then drives the universal shaft and the transmission shaft to rotate. In order to realize large curvature deflection, the bending degree of the bent shell is 3-4 degrees, and the number of stages of the screw motor is 1-2.5 stages. The screw motor with small number of steps is used for reducing the size of the screw motor as much as possible on the basis of meeting the drilling power requirement of the weak stratum. The bearing group is positioned between the lower shell and the transmission shaft, and the transmission shaft bearing group comprises an upper TC bearing 2-5, a lower TC bearing 2-7 and a thrust bearing 2-6 positioned between the upper TC bearing and the lower TC bearing.
Referring to fig. 1, 9 and 10, a pilot hole-repairing drill bit 1 is in threaded connection with the lower end of a transmission shaft and rotates along with the transmission shaft. The guide hole repairing drill consists of a conical guide section 1-1 and a cylindrical gauge section 1-2, the guide hole repairing drill is provided with a central hole which is penetrated up and down, and the periphery of the guide hole repairing drill is provided with a pulp returning groove 1-3. The structure can enable mud to flow into the hole bottom through the drill bit body, and sediment at the hole bottom is carried by the mud with large flow and returns to the hole opening through the mud returning groove, so that the action of removing the sediment at the hole bottom is completed. The intersecting line of the pulp returning groove and the cylindrical surface of the gauge section also has the function of hole repairing.
Referring to fig. 1 and 5-8, the recyclable seat sealer 7 is arranged in a sleeve 8, the lower end of the sleeve is connected with a sleeve joint 9 in a threaded manner, a check ring is arranged in the sleeve joint, an annular boss is arranged on the outer surface of the lower end of the recyclable seat sealer shell, and the boss is located on the check ring to prevent the pipe from falling under the condition of incomplete seat sealing. The recyclable seat sealer comprises a central tube 7-1, an outer shell 7-3, a lower core tube 7-7, an upper joint 7-2, a lower joint 7-8 and a locking mechanism. The upper end and the lower end of the outer shell are respectively in threaded connection with an upper joint and a lower joint, the central tube is in sliding fit with the upper joint, the upper end of the central tube extends out of the upper joint, and the upper end of the central tube is provided with internal threads. The locking mechanism is provided with a slider 7-5 and a tooth block 7-6. The sliding body is in sliding fit with the shaft hole of the outer shell, the tooth block is arranged in the chute 7-5-1 of the sliding body, the tooth block corresponds to the tooth block window 7-3-1 arranged on the wall of the outer shell, the upper end and the lower end of the sliding body are respectively connected with the lower end of the central tube and the upper end of the lower core tube, the lower core tube is of a hollow structure, and the lower core tube is in sliding fit with the shaft hole of the lower joint. The angle of inclination of chute bottom surface is 5 ~ 7, and the tooth piece is wedge, and the tooth piece has the inclination who matches with the chute bottom surface with the face that contacts of chute bottom surface, and the cross section shape of chute is the dovetail, and the tooth piece matches and pegs graft in the chute, and the surface of tooth piece is the arc surface, and this extrados matches the laminating with sheathed tube inner wall, is equipped with the insection on the surface of tooth piece. The central tube is provided with an anti-drop ring 7-4 which is connected with the central tube in a threaded manner, and the anti-drop ring is positioned between the upper joint and the sliding body. The lower joint is of a hollow structure, and the lower end of the lower joint is in threaded connection with the upper end of the seat sealer joint 6.
When the invention is used, the recyclable seat sealer and the sleeve are firstly subjected to seat sealing, so that the purpose of tightly combining the sleeve and the recyclable seat sealer is achieved. The seat sealing step is as follows: the sleeve is connected with the sleeve joint through screw threads, and the recyclable seat sealer is placed in the sleeve; the central tube is pressed down by external force, the central tube is pressed down to drive the sliding body to move downwards, and then the tooth block is pushed to move outwards along the radial direction until the tooth block is tightly attached to the sleeve, and the seat sealing process is completed at the moment. After the seat sealing is finished, a guide hole repairing drill bit, a screw motor, a deformed drill rod, an MWD measurement while drilling instrument and a sleeve which is already in seat sealing with the recoverable seat sealing device are sequentially put into the guide hole repairing drill bit, the screw motor, the deformed drill rod, the MWD measurement while drilling instrument and the sleeve which is already in seat sealing with the recoverable seat sealing device, and then the sleeves are put into the guide hole repairing drill bit one by one according to the position where the sleeve needs to be put into the guide hole repairing drill bit until the sleeve at the lowest end is put into place, and at the moment, the sleeve at the uppermost hole is fixed for unsealing. In the process of lowering, before the guide hole repairing drill bit enters the deflecting section, introducing pressure slurry into the central pipe, detecting the change of the tool face angle in the process of lowering the pipe string, and adjusting the tool face angle to a calibration zero position through a forward rotation drill rod if the tool face angle deviates from the calibration zero position in the process of lowering; the method comprises the steps that one or a plurality of casing pipes of a deflecting section are put into a stratum according to the situation, then pressure slurry is introduced, the pressure slurry drives a rotor of a screw motor to rotate, the rotor drives a guide hole repairing drill bit to rotate through a driving shaft, and the rotation of the guide hole repairing drill bit and the flushing of the slurry act simultaneously, so that sediment at the bottom of a hole is discharged out of the hole, and the casing pipes smoothly enter the inclined hole making section under the guidance of the device; when the casing is put in place along with the drilling tool, the casing needs to be unlocked; the unlocking process is as follows: and (3) a drill rod is put in, so that the drill rod is connected with a female buckle at the upper end of the central tube, the sleeve outside the hole is clamped and fixed, the sliding body is moved upwards in a strong lifting mode, further the tooth block is retracted, and then the seat sealer, the screw motor and the drill bit are lifted out of the hole together by lifting the drill rod.
Claims (8)
1. A power direction casing device that is used for weak stratum to make inclined hole section, its characterized in that: the device comprises the following components from bottom to top: the device comprises a guide hole repairing drill bit (1) for guiding a lower sleeve, a screw motor (2) for providing drilling power, a deformed drill rod (4) for guiding the bending of the sleeve and a recoverable seat sealer (7) for locking or unlocking the sleeve, wherein the screw motor drives a guide hole repairing drill bit of a hollow structure through a transmission shaft, the upper end of the screw motor is connected with the lower end of the deformed drill rod through a directional joint (3), the upper end of the deformed drill rod is connected with the lower joint of the recoverable seat sealer through a seat sealer joint (6), the recoverable seat sealer is provided with a central pipe, and slurry introduced into the central pipe can flow to the guide hole repairing drill bit and is discharged from the bottom end of the guide hole repairing drill bit;
the deformed drill rod (4) is an elongated rod with a hollow structure, the length of the deformed drill rod is equal to that of a single part of a conventional drill rod, the outer diameter of the deformed drill rod is 0.5-0.8 times of the inner diameter of a guided and lowered casing, and an MWD measurement while drilling instrument (5) is arranged in the deformed drill rod;
the recyclable seat sealer comprises a central tube (7-1), an outer shell (7-3), a lower core tube (7-7), an upper joint (7-2), a lower joint (7-8) and a locking mechanism, wherein the upper end and the lower end of the outer shell are respectively connected with the upper joint and the lower joint, and the central tube is in sliding fit with the upper joint; the locking mechanism is provided with a sliding body (7-5) and a tooth block (7-6), the sliding body is in sliding fit with the shaft hole of the outer shell, and the tooth block is arranged in a chute (7-5-1) of the sliding body; the tooth block corresponds to a tooth block window (7-3-1) arranged on the wall of the outer shell, the upper end and the lower end of the sliding body are respectively connected with the lower end of the central tube and the upper end of the lower core tube, and the lower core tube is in sliding fit with the shaft hole of the lower joint;
the guiding hole repairing drill bit (1) is provided with a central hole which is penetrated up and down, and the periphery of the guiding hole repairing drill bit is provided with a slurry returning groove; mud can flow into the hole bottom through the drill bit body, and the sediment at the hole bottom is carried by the mud with large flow and returns to the orifice through the mud returning groove, so as to finish the sediment removal effect at the hole bottom.
2. A power steering casing assembly for a deviated hole section of a weak formation according to claim 1 wherein: the tooth piece is wedge-shaped, and the tooth piece has the inclination that matches with the chute bottom surface with the face that contacts of chute bottom surface, and the cross section shape of chute is the dovetail, and the tooth piece matches and pegs graft in the chute, and the surface of tooth piece is the arc surface, is equipped with the insection on the surface.
3. A power steering casing assembly for a deviated hole section of a weak formation according to claim 1 wherein: the central tube is provided with an anti-drop ring (7-4) in threaded connection with the central tube, and the anti-drop ring is positioned between the upper joint and the sliding body.
4. A power steering casing assembly for a deviated hole section of a weak formation according to claim 1 wherein: the guiding hole repairing drill bit (1) is composed of a conical guiding section (1-1) and a cylindrical gauge section (1-2), a slurry returning groove (1-3) is formed in the periphery of the guiding hole repairing drill bit, and a drill bit central hole (1-4) penetrating from top to bottom is formed in the guiding hole repairing drill bit.
5. A power steering casing assembly for a deviated hole section of a weak formation according to claim 1 wherein: the screw motor comprises a stator (2-1), a rotor (2-2), a universal shaft (2-3), a bent shell (2-4) and a transmission mechanism, wherein the transmission mechanism is provided with a transmission shaft (2-9), a bearing group and a lower shell (2-8) of a hollow structure, the upper end and the lower end of the universal shaft are respectively connected with the rotor and the transmission shaft, the upper end and the lower end of the bent shell are respectively connected with the stator and the lower shell, the universal shaft is positioned in the bent shell, the transmission shaft is a hollow shaft, the transmission shaft is positioned in the bent shell and the lower shell, the bending degree of the bent shell is 3-4 degrees, and the stage number of the screw motor is 1-2.5.
6. The power steering casing assembly for a deviated hole section of a weak formation according to claim 5 wherein: the upper part of the transmission shaft is provided with a transmission shaft side hole (2-10) for introducing slurry into the transmission shaft.
7. The power steering casing assembly for a deviated hole section of a weak formation according to claim 5 wherein: the bearing group is positioned between the lower shell and the transmission shaft and comprises an upper TC bearing (2-5), a lower TC bearing (2-7) and a thrust bearing (2-6) positioned between the upper TC bearing and the lower TC bearing.
8. The power steering casing assembly for a deviated hole section of a weak formation of claim 7 wherein: the upper end of the central tube extends out of the upper joint, and the upper end of the central tube is provided with internal threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811096535.8A CN109162642B (en) | 2018-09-19 | 2018-09-19 | Power guiding casing pipe running device for inclined hole section of weak stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811096535.8A CN109162642B (en) | 2018-09-19 | 2018-09-19 | Power guiding casing pipe running device for inclined hole section of weak stratum |
Publications (2)
| Publication Number | Publication Date |
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| CN109162642A CN109162642A (en) | 2019-01-08 |
| CN109162642B true CN109162642B (en) | 2024-04-16 |
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| CN201811096535.8A Active CN109162642B (en) | 2018-09-19 | 2018-09-19 | Power guiding casing pipe running device for inclined hole section of weak stratum |
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| CN117108201B (en) * | 2023-07-26 | 2024-04-02 | 中国矿业大学(北京) | Directional drilling device with controllable curvature and drilling method |
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