CN113006696A - Drillable reamer for casing running operation - Google Patents

Drillable reamer for casing running operation Download PDF

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Publication number
CN113006696A
CN113006696A CN202110345249.6A CN202110345249A CN113006696A CN 113006696 A CN113006696 A CN 113006696A CN 202110345249 A CN202110345249 A CN 202110345249A CN 113006696 A CN113006696 A CN 113006696A
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CN
China
Prior art keywords
main shaft
wall
casing
fixedly connected
shell
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Granted
Application number
CN202110345249.6A
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Chinese (zh)
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CN113006696B (en
Inventor
张强
何力
吴志超
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Yangtze University
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Yangtze University
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Priority to CN202110345249.6A priority Critical patent/CN113006696B/en
Publication of CN113006696A publication Critical patent/CN113006696A/en
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Publication of CN113006696B publication Critical patent/CN113006696B/en
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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
    • E21B7/28—Enlarging drilled holes, e.g. by counterboring
    • 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
    • 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

Abstract

The invention relates to a drillable reamer for casing running operation, which comprises a shell, a main shaft, a driving assembly and a drill bit assembly, wherein the top of the shell is provided with a detachable connecting structure for detachably connecting with a casing; the main shaft is rotatably arranged in the shell; the driving assembly is arranged in the shell and is fixedly connected with the main shaft; the drill bit assembly is fixedly connected with the bottom of the main shaft. According to the drillable reamer for casing running operation, when a casing is in blockage, the main shaft and the drill bit assembly are driven to rotate through the driving assembly, so that the purposes of trimming the inner wall of a borehole, cleaning the sand setting of the borehole and scraping a blocking object to enlarge the diameter of the borehole are achieved, and the casing is ensured to be smoothly run in; and after the well cementation operation is finished, a drill bit with a smaller diameter is put in, so that the main shaft and the driving assembly in the shell can be drilled out, and the subsequent construction operation is ensured to be carried out smoothly.

Description

Drillable reamer for casing running operation
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a drillable reamer for casing running operation.
Background
In the process of oil and gas exploitation, well cementation operation is required for a drilled well bore, namely, a casing is put into the well bore, and then cement is injected into an annular space between the outer side of the casing and a well wall so as to support the well bore and prevent rock collapse of the well wall. In the actual cementing operation process, due to the reasons of the reduction of the diameter of a well hole or local collapse caused by formation stress, the blockage of the well hole caused by the sediment and sand accumulation of drilling fluid, or the deformation of the well hole at the bending section of the well hole, the running of the operation is influenced by the fact that a casing is put into the well hole to meet the resistance, therefore, the power reaming tool is installed at the lowest end of the casing to trim the deformed well hole or scrape and remove the underground settled sand, and the method is an effective way for solving the problem of the resistance of the casing. Meanwhile, the internal structure of the reaming tool is required to be easy to drill away, so that subsequent construction is facilitated.
Disclosure of Invention
In view of the above, there is a need for a drillable reamer for casing running operation, which solves the problem of difficult casing running into a borehole due to formation stress induced borehole diameter shrinkage or local collapse, drilling fluid sediment sand accumulation blocking the borehole, or borehole bending deformation during actual cementing operation.
The present invention provides a drillable reamer for casing operations, comprising:
the top of the shell is provided with a detachable connecting structure which is used for being detachably connected with the sleeve;
the main shaft is rotatably arranged inside the shell;
the driving assembly is arranged in the shell, is fixedly connected with the main shaft and is used for driving the main shaft to rotate;
and the drill bit assembly is fixedly connected with the bottom of the main shaft.
Furthermore, the driving assembly comprises a plurality of groups of turbine stators and turbine rotors which are connected in series along the axial direction of the main shaft, the turbine stators are fixedly connected with the inner wall of the shell, and the turbine rotors are fixedly connected with the outer wall of the main shaft.
Furthermore, a first limit groove is formed in the inner wall of the shell along the axial direction of the shell, and a first bump with the shape and the width matched with those of the first limit groove is fixedly arranged on the outer edge of the turbine stator; the outer wall of the main shaft is provided with a key groove along the axial direction, a connecting key is fixedly installed in the key groove, and the inner edge of the turbine rotor is provided with a second limiting groove along the axial direction.
Furthermore, a first shaft shoulder is arranged at the bottom of the driving assembly on the main shaft, a compression nut is connected to the top of the driving assembly on the main shaft through threads, and the driving assembly is compressed and fixed on the first shaft shoulder through the compression nut.
Furthermore, a centering bearing is fixedly connected between the compression nut and the driving component and on the outer wall of the main shaft, and a plurality of first inflow holes are formed in the outer ring of the centering bearing along the circumferential direction.
Furthermore, a second bump is fixedly arranged on the outer ring of the centering bearing, the shape and the size of the second bump are matched with those of the first limiting groove, and the second bump is matched with the first limiting groove to prevent the outer ring of the centering bearing from rotating.
Furthermore, the drill bit is located at the bottom of the driving assembly, a plurality of through holes are formed in the outer wall of the main shaft along the circumferential direction, a liquid channel is formed in the main shaft and located at the bottom of the through holes, a plurality of liquid outlet holes are formed in the bottom of the drill bit assembly, and the inner cavity of the sleeve, the first inflow hole, the through holes, the liquid channel and the liquid outlet holes are communicated in sequence to form a drilling fluid circulation channel.
Further, the drill bit assembly includes:
the bottom end of the spindle penetrates through the shell and is fixedly connected with the bit body, and a plurality of cutting teeth are fixedly arranged on the outer wall of the bit body;
the guide shoe is fixedly installed at the bottom end of the drill bit body, and the liquid outlet hole is formed in the bottom of the guide shoe.
Furthermore, a plurality of annular first track grooves are formed in the outer wall of the shell along the axial direction, a plurality of annular second track grooves are formed in the inner wall of the drill bit body along the axial direction, the first track grooves correspond to the second track grooves in a one-to-one mode, and a plurality of steel balls are placed in the first track grooves and the second track grooves.
Furthermore, a first thread is formed in the inner wall of the bottom of the drill bit body, a second thread is formed in the outer wall of the bottom end of the main shaft, a third thread is formed in the outer wall of the top of the guide shoe, the second thread and the third thread are matched with the first thread, and the main shaft and the guide shoe are fixedly connected with the drill bit body through threads.
According to the drillable reamer for casing running operation, when a casing is in blockage, the driving assembly drives the main shaft and the drill bit assembly to rotate, so that the purposes of trimming the inner wall of a borehole, cleaning the sand setting of the borehole and scraping a blockage to enlarge the diameter of the borehole are achieved, and the smooth running of the casing is ensured; and after the well cementation operation is finished, a drill bit with a smaller diameter is put in, so that the main shaft and the driving assembly in the shell can be drilled out, and the subsequent construction operation is ensured to be carried out smoothly.
Drawings
FIG. 1 is a cross-sectional view of a drillable reamer of the type used in casing running operations provided by the present invention;
FIG. 2 is a sectional view taken along line B-B of FIG. 1;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 4 is a sectional view of C-C in fig. 1.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention provides a drillable reamer for casing running operation, which is shown in a sectional view of the drillable reamer for casing running operation in figure 1, and comprises a shell 1, a main shaft 2, a driving assembly 3 and a drill bit assembly 4, wherein the top of the shell 1 is provided with a detachable connecting structure for detachably connecting with a casing; the main shaft 2 is rotatably arranged inside the shell 1; the driving assembly 3 is arranged inside the shell 1, is fixedly connected with the main shaft 2, and is used for driving the main shaft 2 to rotate; the drill bit assembly 4 is fixedly connected with the bottom of the main shaft 2.
When the casing is stopped, the driving assembly 3 drives the main shaft 2 and the drill bit assembly 4 to rotate, so that the purposes of trimming the inner wall of the borehole, cleaning the sand sediment of the borehole and scraping the blockage to enlarge the diameter of the borehole are achieved, and the smooth running of the casing is ensured.
In a preferred embodiment, the driving assembly 3 includes several sets of a turbine stator 31 and a turbine rotor 32 connected in series along the axial direction of the main shaft 2, the turbine stator 31 is fixedly connected with the inner wall of the housing 1, and the turbine rotor 32 is fixedly connected with the outer wall of the main shaft 2. The blades of the turbine stator 31 and the turbine rotor 32 are bent in opposite directions, and the drilling fluid flows in the direction of the deflection of the blades of the turbine stator 31, and forcefully impacts the blades of the turbine rotor 32, so that the turbine rotor 32 drives the main shaft 2 to rotate.
As a preferred embodiment, referring to fig. 1 and 2, a first limiting groove 11 is formed in an inner wall of the housing 1 along an axial direction thereof, and a first protrusion 33 having a shape and a width matched with those of the first limiting groove 11 is fixedly disposed on an outer edge of the turbine stator 31; the outer wall of main shaft 2 has seted up the keyway along its axial, fixed mounting has connecting key 34 in the keyway, the inner edge of turbine rotor 32 has seted up second spacing groove 35 along its axial for with connecting key 34 cooperation is connected. The first protrusion 33 and the first limit groove 11, and the connection key 34 and the second limit groove 35 are respectively connected to each other in a matching manner, so that the turbine stator 31 is prevented from rotating relative to the housing 1, and the turbine rotor 32 is prevented from rotating relative to the main shaft 2.
As a preferred embodiment, with continued reference to fig. 1, a first annular groove is formed in a lower end surface of the hub at the inner edge of the turbine stator 31, and a first thrust wear-resistant ring 36 is installed in the first annular groove; a second annular groove is formed in the upper end face of the hub on the inner edge of the turbine rotor 32, a second thrust wear-resisting ring 37 is installed in the second annular groove, and the second thrust wear-resisting ring 37 and the first thrust wear-resisting ring 36 act together to limit the axial position of the turbine stator 31.
In a preferred embodiment, a first shoulder 21 is disposed on the bottom of the main shaft 2 at the bottom of the driving assembly 3, a compression nut 22 is connected to the top of the main shaft 2 at the top of the driving assembly 3 through a screw thread, and the compression nut 22 fixes the driving assembly 3 on the first shoulder 21 in a compression manner. The first shoulder 21 is used for providing axial support for the driving assembly 3, and the first shoulder 21 may also be an annular sleeve fixedly connected to the outer wall of the main shaft 2.
As a preferred embodiment, referring to fig. 1 and 3, a centering bearing 38 is fixedly connected between the compression nut 22 and the drive assembly 3 and on an outer wall of the main shaft 2, and a plurality of first inflow holes 381 are circumferentially opened on an outer ring of the centering bearing 38, so that drilling fluid flowing from an upper end of the housing 1 can flow to the drive assembly 3 to drive the drive assembly 3 by an impact force of the drilling fluid. The first inflow hole 381 may have a fan-shaped, circular, or square cross-section.
In a preferred embodiment, the outer ring of the centering bearing 38 is fixedly provided with a second protrusion 382, the shape and size of which match those of the first limiting groove 11, and the second protrusion 382 is matched with the first limiting groove 11 to prevent the outer ring of the centering bearing 38 from rotating. The outer ring of the centering bearing 38 is provided with a transverse hole, a threaded hole is formed in the position of the shell 1 corresponding to the transverse hole, and a screw pin 383 is arranged in the threaded hole to prevent the outer ring of the centering bearing 38 from sliding along the axial direction.
As a preferred embodiment, please refer to fig. 1, a plurality of through holes 20 are formed at the bottom of the driving assembly 3 and on the outer wall of the main shaft 2 along the circumferential direction, a liquid channel 23 is formed at the bottom of the through hole 20 and in the main shaft 2, a plurality of liquid outlet holes 41 are formed at the bottom of the drill bit assembly 4, and the inner cavity of the casing, the first inflow hole 381, the through hole 20, the liquid channel 23, and the liquid outlet holes 41 are sequentially communicated to form a drilling fluid circulation channel. In this embodiment, the outer wall of the main shaft 2 is uniformly provided with 2 to 3 through holes 20 along the circumferential direction, and the included angle between each through hole 20 and the axis of the main shaft 2 is 20 to 70 degrees.
As a preferred embodiment, referring to fig. 1 and 4, the drill bit assembly 4 includes a bit body 42 and a guide shoe 43, the bottom end of the spindle 2 passes through the housing 1 and is fixedly connected with the bit body 42, and a plurality of cutting teeth 420 are fixedly arranged on the outer wall of the bit body 42; the guide shoe 43 is fixedly arranged at the bottom end of the drill body 42, and the liquid outlet hole 41 is formed at the bottom of the guide shoe 43. In this embodiment, the bit body 42 is a ring-shaped element with strip-shaped protruding blades distributed on the outer surface, and the cutting teeth 420 are arranged on the outer side surface and the lower end crown of the protruding blades of the bit body; the guide shoe 43 is a hollow cone.
As a preferred embodiment, the inner wall of the bottom of the bit body 42 is provided with a first thread 421, the outer wall of the bottom end of the main shaft 2 is provided with a second thread 24, the outer wall of the top of the guide shoe 43 is provided with a third thread 431, the second thread 24 and the third thread 431 are both matched with the first thread 421, and the main shaft 2 and the guide shoe 43 are both fixedly connected with the bit body 42 through threads. The minor diameter of the first thread 421 is not smaller than the inner diameter of the housing 1.
As the preferred embodiment, a plurality of annular first raceway grooves are axially formed in the outer wall of the housing 1, a plurality of annular second raceway grooves are axially formed in the inner wall of the bit body 42, the first raceway grooves correspond to the second raceway grooves one to one, and a plurality of steel balls 422 are placed in the first raceway grooves and the second raceway grooves, so that the situation that the spindle 2 drives the bit body 42 to rotate can be avoided, and the bit body 42 and the housing 1 generate large friction loss. In this embodiment, a plurality of transverse through holes are axially formed in the protruded blades of the bit body 42, and the transverse through holes are communicated with the second track grooves and used for placing steel balls 422 into the second track grooves; after the steel ball 422 is placed, a plug 423 is welded in the transverse through hole in a stacking mode, and the steel ball 422 is prevented from falling off.
As a preferred embodiment, please refer to fig. 1, a second shoulder 25 is fixedly disposed on the spindle 2 at the bottom of the housing 1, and a plurality of second inflow holes 250 are circumferentially formed at the top of the second shoulder 25.
In a preferred embodiment, the top inner wall of the housing 1 is provided with a tapered thread 13 for sealing connection with a casing.
In a preferred embodiment, the materials of the main shaft 2, the compression nut 22, the centering bearing 38, the screw pin 383, the turbine stator 31, the turbine rotor 32, and the guide shoe 43 include a drillable material such as copper or aluminum alloy. In this embodiment, the main shaft 2 has a hollow structure as a whole, so that the weight of the main shaft can be reduced and the main shaft can be easily removed by drilling.
The working principle is as follows:
in use, the drillable reamer for casing running provided by the embodiment of the invention is fixedly connected with the casing through the taper threads 13. When the lower casing is blocked, a certain flow of drilling fluid is introduced into the casing, the drilling fluid flows in a drilling fluid circulation channel formed by the first inflow hole 381, the through hole 20, the fluid channel 23 and the fluid outlet 41, and when the drilling fluid flows through the driving assembly 3, the drilling fluid drives the turbine rotor 32 to rotate, so that the main shaft 2 and the drill bit assembly 4 are driven to rotate, and the plurality of cutting teeth 420 distributed on the outer sides of the blades and the crown of the bit body 42 trim the inner wall of a borehole, clean the sand sediment of the borehole and scrape the blockage, so that the diameter of the borehole is enlarged, and the smooth running of the casing is ensured. After the casing is lowered to a set position and cementing operation is completed, a drill bit with a smaller diameter is lowered, and the main shaft 2, the compression nut 22, the centralizing bearing 38, the screw pin 383, the turbine stator 31, the turbine rotor 32 and the guide shoe 43 in the shell 1 are drilled out, so that subsequent construction operation is ensured to be carried out smoothly; the shell 1 and the bit body 42 are fixed at the lower end of the casing and are cemented and left in the borehole.
According to the drillable reamer for casing running operation, when a casing is in blockage, the driving assembly 3 drives the main shaft 2 and the drill bit assembly 4 to rotate, so that the purposes of trimming the inner wall of a borehole, cleaning the sand sediment of the borehole and scraping a blockage to enlarge the diameter of the borehole are achieved, and the smooth running of the casing is ensured; after the cementing operation is completed, a drill bit with a smaller diameter is put in, so that the main shaft 2, the compression nut 22, the centering bearing 38, the screw pin 383, the turbine stator 31, the turbine rotor 32 and the guide shoe 43 in the shell 1 can be removed by drilling, and the subsequent construction operation can be carried out smoothly.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A drillable reamer for casing operations, comprising:
the top of the shell is provided with a detachable connecting structure which is used for being detachably connected with the sleeve;
the main shaft is rotatably arranged inside the shell;
the driving assembly is arranged in the shell, is fixedly connected with the main shaft and is used for driving the main shaft to rotate;
and the drill bit assembly is fixedly connected with the bottom of the main shaft.
2. The drillable reamer of claim 1 wherein the drive assembly includes sets of turbine stators and turbine rotors axially connected in series along the main shaft, the turbine stators being fixedly connected to the inner wall of the housing and the turbine rotors being fixedly connected to the outer wall of the main shaft.
3. The drillable reamer for casing running operation of claim 2, wherein the inner wall of the housing is provided with a first limiting groove along the axial direction thereof, and the outer edge of the turbine stator is fixedly provided with a first bump with the shape and width matched with those of the first limiting groove; the outer wall of the main shaft is provided with a key groove along the axial direction, a connecting key is fixedly installed in the key groove, and the inner edge of the turbine rotor is provided with a second limiting groove along the axial direction.
4. A drillable reamer for casing running operations as claimed in claim 2 wherein said spindle has a first shoulder at the bottom of said drive assembly and a compression nut threadedly attached to the top of said spindle at said drive assembly, said compression nut compressively retaining said drive assembly on said first shoulder.
5. The drillable reamer of claim 4, wherein a centering bearing is fixedly connected to an outer wall of the main shaft between the compression nut and the drive assembly, and a plurality of first inflow holes are circumferentially formed in an outer ring of the centering bearing.
6. The drillable reamer of claim 5, wherein the outer race of the centralizing bearing is fixedly provided with a second projection, the shape and size of which match those of the first limiting groove, the second projection and the first limiting groove are matched with each other to prevent the outer race of the centralizing bearing from rotating.
7. The drillable reamer of claim 5, wherein a plurality of through holes are formed in the outer wall of the main shaft at the bottom of the driving assembly along the circumferential direction, a fluid channel is formed in the main shaft at the bottom of the through holes, a plurality of fluid outlet holes are formed in the bottom of the drill bit assembly, and the inner cavity of the casing, the first inflow hole, the through holes, the fluid channel and the fluid outlet holes are communicated to form a drilling fluid circulation channel.
8. A drillable reamer for casing operations as claimed in claim 7, wherein the drill bit assembly comprises:
the bottom end of the spindle penetrates through the shell and is fixedly connected with the bit body, and a plurality of cutting teeth are fixedly arranged on the outer wall of the bit body;
the guide shoe is fixedly installed at the bottom end of the drill bit body, and the liquid outlet hole is formed in the bottom of the guide shoe.
9. The drillable reamer of claim 8, wherein the outer wall of the casing is axially formed with a plurality of annular first raceway grooves, the inner wall of the bit body is axially formed with a plurality of annular second raceway grooves, the first raceway grooves are in one-to-one correspondence with the second raceway grooves, and a plurality of steel balls are disposed in the corresponding first raceway grooves and the corresponding second raceway grooves.
10. The drillable reamer of claim 8, wherein the inner wall of the bottom of the bit body defines a first thread, the outer wall of the bottom of the spindle defines a second thread, the outer wall of the top of the guide shoe defines a third thread, the second thread and the third thread are both adapted to mate with the first thread, and the spindle and the guide shoe are both fixedly connected to the bit body by threads.
CN202110345249.6A 2021-03-31 2021-03-31 Drillable reamer for casing running operation Active CN113006696B (en)

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CN113006696B CN113006696B (en) 2024-04-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11326400B2 (en) * 2020-09-15 2022-05-10 Yangtze University Drillable adaptive turbine guide shoe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343964A (en) * 1991-04-12 1994-09-06 Andre Leroy Petroleum, gas or geothermal driling apparatus
CN204163631U (en) * 2014-08-28 2015-02-18 深圳市百勤石油技术有限公司 A kind of ultromotivity casing pipe running device
CN107448156A (en) * 2017-09-15 2017-12-08 长江大学 A kind of full-bore casing guide
CN109281617A (en) * 2018-11-29 2019-01-29 四川航天烽火伺服控制技术有限公司 A kind of cased hole completion tubing string auxiliary tripping in tool
CN210622732U (en) * 2019-09-06 2020-05-26 中石化石油工程技术服务有限公司 Guide shoe device for running casing
CN111219147A (en) * 2020-01-09 2020-06-02 中国石油大学(华东) Petroleum drilling speed-up equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5343964A (en) * 1991-04-12 1994-09-06 Andre Leroy Petroleum, gas or geothermal driling apparatus
CN204163631U (en) * 2014-08-28 2015-02-18 深圳市百勤石油技术有限公司 A kind of ultromotivity casing pipe running device
CN107448156A (en) * 2017-09-15 2017-12-08 长江大学 A kind of full-bore casing guide
CN109281617A (en) * 2018-11-29 2019-01-29 四川航天烽火伺服控制技术有限公司 A kind of cased hole completion tubing string auxiliary tripping in tool
CN210622732U (en) * 2019-09-06 2020-05-26 中石化石油工程技术服务有限公司 Guide shoe device for running casing
CN111219147A (en) * 2020-01-09 2020-06-02 中国石油大学(华东) Petroleum drilling speed-up equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11326400B2 (en) * 2020-09-15 2022-05-10 Yangtze University Drillable adaptive turbine guide shoe

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