CN115726738B - Self-rotating borehole cleaning tool for sliding drilling - Google Patents
Self-rotating borehole cleaning tool for sliding drilling Download PDFInfo
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- CN115726738B CN115726738B CN202110980945.4A CN202110980945A CN115726738B CN 115726738 B CN115726738 B CN 115726738B CN 202110980945 A CN202110980945 A CN 202110980945A CN 115726738 B CN115726738 B CN 115726738B
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- 238000005553 drilling Methods 0.000 title claims abstract description 79
- 238000004140 cleaning Methods 0.000 title claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 238000003491 array Methods 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims 1
- 238000005520 cutting process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 238000007790 scraping Methods 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention belongs to the technical field of oil and gas drilling, and aims to solve the problems that a drilling tool is large in friction resistance and easy to stick and clamp in the sliding drilling process, and particularly relates to a self-rotating borehole cleaning tool for sliding drilling, which comprises a first connecting member, a rotating body and a second connecting member; the first connecting member comprises an upper joint body and a mandrel; when in sliding drilling, the drilling fluid is discharged after flowing through the inside of the tool, and the turbine-shaped structure arranged at one end of the rotating body drives the rotating body to rotate relative to the first connecting component and the second connecting component under the impact action of the drilling fluid, namely, the V-shaped ribs arranged outside the rotating body are driven to rotate at high speed, the scraping damages a cuttings bed to clean a borehole, turbulence opposite to the drilling direction is generated in an annulus of the borehole wall so as to improve the efficiency of carrying the cuttings with the drilling fluid, and the annulus drilling fluid flow field structure is improved; the anti-blocking mechanism formed by the first support ring and the second support ring ensures the protection of the rotating body in sliding drilling.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling, and particularly relates to a self-rotating borehole cleaning tool for sliding drilling.
Background
In order to meet the requirements of oil and gas exploration and development, the proportion of complex structure wells such as large-displacement wells, horizontal wells and the like is higher and higher, and in the type of directional well drilling operation, sliding drilling is required to be frequently carried out so as to adjust the well track. In the sliding drilling process, the drill string does not rotate for a long time, a cutting bed is easily accumulated in a well section with a high inclination in a well hole, friction resistance of a drilling tool is increased, sticking is easily generated, and great risks are brought to drilling construction.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problems that a drilling tool is large in friction resistance and easy to stick in a sliding drilling process, the invention provides a self-rotating borehole cleaning tool for sliding drilling, which comprises a first connecting member, a rotating body and a second connecting member, wherein the second connecting member is arranged at one end of the rotating body far away from the first connecting member;
The first connecting member comprises an upper joint body and a mandrel, and the mandrel is arranged in the center of the upper joint body; a first inner conical threaded hole is formed in one end, far away from the second connecting member, of the upper joint body; the mandrel is arranged below the first inner conical threaded hole; an annular cavity is formed between the outer wall of the mandrel and the upper joint body;
The mandrel comprises a first mandrel section and a second mandrel section, and the second mandrel section is arranged at one end of the first mandrel section far away from the first inner conical threaded hole; the first mandrel section is a solid mandrel section, and a first overflow hole is formed between the solid mandrel section and the first inner conical threaded hole so as to be communicated with the annular cavity and the first inner conical threaded hole; the second mandrel section is a hollow shaft section; a second overflow hole is formed between the second mandrel section and the first mandrel section so as to communicate the annular cavity and the hollow of the second mandrel section;
The rotary body is sleeved on the mandrel and connected with the mandrel through a bearing assembly; one end of the rotary body is provided with a turbine-shaped structure, and the turbine-shaped structure is arranged inside the annular cavity; a third overflow hole matched with the second overflow hole is formed in the rotary body; a first rotary sealing assembly is arranged between the inner wall of the rotary body and the second mandrel section; a second rotary sealing assembly is arranged between the outer wall of the rotary body and the upper joint body; the periphery of the rotating body is provided with V-shaped edges;
The second connecting component is of a hollow shaft structure; a third rotary sealing assembly is arranged between the inner wall of one end of the second connecting member and the outer wall of one end of the rotary body, which is far away from the annular cavity; the second mandrel section extends to the inside of the second connecting member in a cantilever manner through the center of the rotating body and is fixedly connected with the second connecting member;
Under the working condition, the drilling fluid entering the first inner conical threaded hole enters the annular cavity through the first overflow hole and impacts the turbine-shaped structure, the turbine-shaped structure drives the rotary body to rotate relative to the first connecting component and the second connecting component under the impact of the drilling fluid, and the rotating V-shaped edges clean the well hole and generate turbulence opposite to the drilling direction in the annular space of the well wall.
In some preferred embodiments, the rotary body comprises a first body shaft section, a second body shaft section, a third body shaft section, a fourth body shaft section and a fifth body shaft section which are sequentially arranged from top to bottom, wherein the first body shaft section is a bearing section of the turbine-shaped structure, and the first body shaft section is matched with the first mandrel section;
The outer diameter of the second body shaft section is larger than that of the first body shaft section, and the third overflow hole is formed in the second body shaft section;
the outer diameter of the third body shaft section is larger than that of the second body shaft section, the second rotary sealing assembly is arranged on the outer side of the third body shaft section, and the third body shaft section is arranged in a manner of overhanging the upper joint body;
The outer diameter of the fourth body shaft section is larger than the outer diameter of the third body shaft section;
The outer diameter of the fifth body shaft section is smaller than that of the fourth body shaft section, and the outer diameter of the fifth body shaft section is consistent with that of the third body shaft section; the third rotary sealing assembly is arranged on the outer side of the fifth body shaft section.
In some preferred embodiments, a first support ring is sleeved outside the third body shaft section; the first support ring is arranged between the fourth body shaft section and the end part of the upper joint body;
The first support ring comprises a first inner ring and a first outer ring which are concentrically arranged, a plurality of brackets are arranged between the outer side of the first inner ring and the inner side of the first outer ring, and the brackets are arranged along the radial direction of the first outer ring; two adjacent brackets, the outer wall of the first inner ring and the inner wall of the first outer ring form a liquid passing channel;
the first inner ring and the third body shaft section are arranged in a clearance way;
the outer diameter of the first outer ring is larger than the outer diameter of the circle where the V-shaped edge is located.
In some preferred embodiments, a second support ring is provided on the outside of the fifth body shaft section;
the second support ring is arranged in accordance with the structure of the first support ring.
In some preferred embodiments, the bearing assembly comprises a first bearing assembly and a second bearing assembly, the first bearing assembly disposed between the third body shaft section and the second mandrel section;
the second bearing assembly is disposed between the fifth body shaft section and the second mandrel section.
In some preferred embodiments, one end of the second connecting member is provided with a counterbore for receiving the fifth body shaft segment;
A second inner conical threaded hole is formed below the countersunk head hole; the end of the second mandrel segment is provided with a first external tapered thread that mates with the second internal tapered threaded bore.
In some preferred embodiments, an end of the second connection member remote from the rotating body is provided with a second external conical thread for interfacing with a drill rod.
In some preferred embodiments, the second mandrel segment is distant from the end of the first mandrel segment to the end of the fifth body shaft segment by a distance h1, and the first external conical thread has a longitudinal length h2, h1=h2.
In some preferred embodiments, the distance from the end of the second internal tapered threaded bore remote from the rotating body to the end of the second connecting member remote from the rotating body is H1, and the longitudinal length of the second external tapered thread is H2, H1 > H2.
In some preferred embodiments, the first overflow holes are a plurality, a plurality of the first overflow hole arrays are arranged and a plurality of the first overflow holes are arranged obliquely;
the second overflow holes are multiple, the second overflow holes are arranged in an array, and the second overflow holes are perpendicular to the longitudinal axis of the mandrel;
The plurality of third overflow holes are arranged in a one-to-one correspondence with the plurality of second overflow holes.
1) According to the self-rotating borehole cleaning tool for sliding drilling, when sliding drilling is carried out, drilling fluid flows through the inside of the tool and is discharged, a turbine-shaped structure arranged at one end of the rotating body drives the rotating body to rotate relative to the first connecting member and the second connecting member under the impact action of the drilling fluid, so that high-speed rotation of V-shaped edges arranged outside the rotating body can be realized, a cuttings bed is scraped and damaged to clean a borehole, turbulence opposite to the drilling direction is generated in an annulus of a borehole wall so as to improve the efficiency of carrying cuttings with the drilling fluid, and an annulus drilling fluid flow field structure is improved; in addition, through the anti-sticking mechanism that first supporting ring and second supporting ring constitute, guarantee the protection of rotatory body in sliding drilling, guarantee well cleaning, downhole safety.
2) According to the self-rotating borehole cleaning tool for sliding drilling, provided by the invention, the borehole cleaning effect can be exerted under the condition of drilling fluid circulation, the sliding drilling friction is reduced, and the operation risk is reduced. In addition, the tool can be used for conventional composite drilling, well completion and other operations, effectively improves the cleaning condition of the well bore, improves the well completion efficiency and improves the well cementation quality.
3) The self-rotating borehole cleaning tool for sliding drilling provided by the invention has the advantages of simple structure and reliable performance, and can effectively ensure borehole cleaning in the sliding drilling process under the condition of pump starting, namely high-speed rotation, reduce risks of downhole drilling sticking and drilling tool breakage, and be suitable for borehole cleaning in the construction of composite drilling, drifting and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
FIG. 1 is a schematic cross-sectional view of one embodiment of the present invention;
fig. 2 is a cross-sectional view taken along A-A in fig. 1.
Reference numerals illustrate:
100. A first connecting member; 110. an upper joint body 111, a first internal tapered threaded bore; 121. a first mandrel segment 122, a second mandrel segment 123, a first external tapered thread 124, a second flow bore; 130. an annulus chamber; 140. a first overflow aperture;
200. Rotating the body; 210. a first body shaft section 211, a turbine-like structure 220, a second body shaft section 221, a third flow aperture 230, a third body shaft section 240, a fourth body shaft section 241, V-ribs 250, a fifth body shaft section 261, a first bearing assembly 262, a second bearing assembly 271, a first rotary seal assembly 272, a second rotary seal assembly 273, a third rotary seal assembly;
300. a second connecting member; 310. a countersunk hole; 320. a second internal tapered threaded bore; 330. a second external conical thread;
400. a first support ring; 410. a first inner ring 420, a first outer ring 430, a bracket 440, and a liquid passing channel;
500. and a second support ring.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
The invention discloses a self-rotating borehole cleaning tool for sliding drilling, which can ensure borehole cleaning and downhole safety in sliding drilling and specifically comprises a first connecting member, a rotating body and a second connecting member, wherein the second connecting member is arranged at one end of the rotating body far away from the first connecting member; the first connecting member comprises an upper joint body and a mandrel, and the mandrel is arranged in the center of the upper joint body; one end of the upper joint body, which is far away from the second connecting component, is provided with a first inner conical threaded hole; the mandrel is arranged below the first inner conical threaded hole; an annular cavity is formed between the outer wall of the mandrel and the upper joint body.
The mandrel comprises a first mandrel section and a second mandrel section, and the second mandrel section is arranged at one end of the first mandrel section far away from the first inner conical threaded hole; the first mandrel section is a solid mandrel section, and a first overflow hole is formed between the solid mandrel section and the first inner conical threaded hole so as to be communicated with the annular cavity and the first inner conical threaded hole; the second mandrel section is a hollow shaft section; a second overflow hole is arranged between the second mandrel section and the first mandrel section so as to be communicated with the annular cavity and the hollow of the second mandrel section.
The rotary body is sleeved on the mandrel and connected with the mandrel through a bearing assembly; one end of the rotary body is provided with a turbine-shaped structure which is arranged in the annular cavity; the rotary body is provided with a third overflow hole matched with the second overflow hole; a first rotary sealing assembly is arranged between the inner wall of the rotary body and the second mandrel section; a second rotary sealing assembly is arranged between the outer wall of the rotary body and the upper joint body; the periphery side of the rotating body is provided with V-shaped edges.
The second connecting component is of a hollow shaft structure; a third rotary sealing assembly is arranged between the inner wall of one end of the second connecting member and the outer wall of one end of the rotary body, which is far away from the annular cavity; the second mandrel segment extends to the inside of the second connecting component in a cantilever mode through the center of the rotating body and is fixedly connected with the second connecting component.
Under the working condition, the drilling fluid entering the first inner conical threaded hole enters the annular cavity through the first overflow hole and impacts the turbine-shaped structure, the turbine-shaped structure drives the rotary body to rotate relative to the first connecting component and the second connecting component under the impact of the drilling fluid, and the rotary V-shaped arris cleans the well hole and generates turbulence opposite to the drilling direction in the annular space of the well wall. According to the self-rotating borehole cleaning tool for sliding drilling, provided by the invention, during sliding drilling, drilling fluid flows through the tool, the V-shaped ribs outside the tool rotate at a high speed, scraping damages a cuttings bed, improves an annular drilling fluid flow field structure, and is provided with an anti-blocking mechanism, so that borehole cleaning and downhole safety are effectively ensured during sliding drilling.
The invention is further described below with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 and 2, the present invention discloses a self-rotating borehole cleaning tool for sliding drilling, comprising a first connecting member 100, a rotating body 200, and a second connecting member 300, the second connecting member being installed at one end of the rotating body far from the first connecting member; the first connection member includes an upper joint body 110 and a mandrel disposed at the center of the upper joint body; the end of the upper joint body, which is far away from the second connecting member, is provided with a first inner conical threaded hole 111; the mandrel is arranged below the first inner conical threaded hole; an annular chamber 130 is provided between the outer wall of the mandrel and the upper connector body.
The mandrel comprises a first mandrel segment 121 and a second mandrel segment 122, wherein the second mandrel segment is arranged at one end of the first mandrel segment far away from the first inner conical threaded hole; the first mandrel section is a solid mandrel section, and a first overflow hole 140 is formed between the solid mandrel section and the first inner conical threaded hole so as to be communicated with the annular cavity and the first inner conical threaded hole; the second mandrel section is a hollow shaft section; a second flow-through hole 124 is arranged between the second mandrel segment and the first mandrel segment to communicate the annular cavity and the hollow of the second mandrel segment.
The rotary body is sleeved on the mandrel and connected with the mandrel through a bearing assembly; one end of the rotary body is provided with a turbine-shaped structure 211, and the turbine-shaped structure is arranged inside the annular cavity; the rotary body is provided with a third overflow hole 221 matched with the second overflow hole; a first rotary sealing assembly is arranged between the inner wall of the rotary body and the second mandrel section; a second rotary sealing assembly is arranged between the outer wall of the rotary body and the upper joint body; the rotating body is provided with V-shaped ribs 241 on the peripheral side.
The second connecting component is of a hollow shaft structure; a third rotary sealing assembly is arranged between the inner wall of one end of the second connecting member and the outer wall of one end of the rotary body, which is far away from the annular cavity; the second mandrel segment extends to the inside of the second connecting component in a cantilever mode through the center of the rotating body and is fixedly connected with the second connecting component.
Under the working state, drilling fluid entering the first inner conical threaded hole enters the annular cavity through the first overflow hole and impacts the turbine-shaped structure, the turbine-shaped structure drives the rotary body to rotate relative to the first connecting component and the second connecting component under the impact of the drilling fluid, the rotating V-shaped arris cleans the well hole, and turbulence opposite to the drilling direction is generated in the annular space of the well wall so as to improve the efficiency of carrying rock debris by the drilling fluid; the drilling fluid flowing through the turbine-shaped structure enters the inner cavity of the mandrel through the second overflow hole and the third overflow hole, and finally flows out of the tool through the inner cavity of the second connecting member.
In this implementation, through the setting of first rotary seal subassembly, second rotary seal subassembly, the drilling fluid of turbine column structure after effectively guaranteeing to strike does not reveal, guarantees that drilling fluid passes through second overflow hole, third overflow hole and gets into the hollow inside of second dabber section, then flows through the hollow inside of second connecting element.
Further, the rotary body includes a first body shaft section 210, a second body shaft section 220, a third body shaft section 230, a fourth body shaft section 240 and a fifth body shaft section 250, which are sequentially arranged from top to bottom, wherein the first body shaft section is a bearing section of a turbine-shaped structure, and the first body shaft section is matched with the first mandrel section. In this embodiment, the first body shaft section, the second body shaft section, the third body shaft section, the fourth body shaft section, and the fifth body shaft section are integrally formed.
The outer diameter of the second body shaft section is larger than that of the first body shaft section, and the third flow through hole 221 is formed in the second body shaft section 220.
The outer diameter of the third body shaft section is larger than that of the second body shaft section, and the first rotary seal assembly 271 is arranged at the inner side of the third body shaft section; the second rotary seal assembly 272 is mounted on the outside of the third body shaft section, which extends from the upper joint body.
The outer diameter of the fourth body shaft section is greater than the outer diameter of the third body shaft section.
The outer diameter of the fifth body shaft section is smaller than that of the fourth body shaft section, and the outer diameter of the fifth body shaft section is consistent with that of the third body shaft section; the third rotary seal assembly 273 is mounted on the outside of the fifth body shaft section.
Preferably, the plurality of V-shaped ribs are arranged on the periphery of the rotating body to form an action surface, and the action surface can clean the well wall when the rotating body rotates.
Further, a first support ring 400 is sleeved on the outer side of the third body shaft section; the first support ring is arranged between the fourth body shaft section and the end part of the upper joint body; the first support ring includes a first inner ring 410 and a first outer ring 420 concentrically disposed, a plurality of holders 430 being disposed between an outer side of the first inner ring and an inner side of the first outer ring, the plurality of holders being disposed along a radial direction of the first outer ring; the two adjacent brackets, the outer wall of the first inner ring and the inner wall of the first outer ring form a liquid passing channel 440.
Preferably, the first inner ring is disposed in a gap with the third body shaft section; the outer diameter of the first outer ring is larger than the outer diameter of the circle where the V-shaped ribs are located.
Further, a second support ring 500 is provided on the outer side of the fifth body shaft section; the second support ring is arranged in accordance with the structure of the first support ring.
In this embodiment, the first support ring and the second support ring are rotatable about the rotating body; through the clearance arrangement of the rotary body, when the drill string is not centered, the first support ring and the second support ring are firstly contacted with the well wall, and form a support in the extending direction perpendicular to the well hole, so that the V-shaped edges are prevented from being pressed and attached to the well wall, and excessive scraping of mud cakes on the well wall is prevented; the first support ring and the second support ring can rotate along steps above and below the V-shaped edge of the rotating body, and the lengths of the first support ring and the second support ring are small, so that even if the first support ring and the second support ring are pressed on a well wall for a short time, the first support ring and the second support ring can be separated from the pressed state instantly through self rotation or the next movement of the drilling tool.
In addition, through a plurality of liquid passages that cross section on first support ring, second support ring is designed, just can not influence the instrument outside and the well wall in the annular space drilling fluid circulation between, also can not influence the scraping of V type arris and change the runner effect.
Preferably, the bearing assembly comprises a first bearing assembly 261 and a second bearing assembly 262, the first bearing assembly being disposed between the third body shaft segment and the second mandrel segment; the second bearing assembly is arranged between the fifth body shaft section and the second mandrel section.
Further, the first bearing assembly and the second bearing assembly can be provided with a plurality of bearings, and the plurality of bearings are sequentially arranged along the longitudinal axial direction of the tool, so long as the connection bearing strength of the rotating body and the mandrel can be met.
Preferably, one end of the second connecting member is provided with a counter bore 310 for receiving the fifth body shaft section; a second inner conical threaded hole 320 is arranged below the countersunk hole; the end of the second mandrel segment is provided with a first external tapered thread 123 that mates with the second internal tapered threaded bore.
Further, the end of the second connection member remote from the swivel body is provided with a second external conical thread 330 for interfacing with the drill rod.
Further, the distance from the end of the second mandrel segment away from the first mandrel segment to the end of the fifth body shaft segment is h1, and the longitudinal length of the first external conical thread is h2, h1=h2.
Further, the distance from the end of the second inner conical threaded hole far away from the rotating body to the end of the second connecting member far away from the rotating body is H1, and the longitudinal length of the second outer conical threaded hole is H2, wherein H1 is more than H2.
Preferably, the first overflow holes are a plurality of, the first overflow hole arrays are arranged and the first overflow holes are obliquely arranged; the second overflow holes are multiple, the second overflow hole arrays are arranged, and the second overflow holes are perpendicular to the longitudinal axis of the mandrel; the third overflow holes are a plurality of, and the third overflow holes and the second overflow holes are arranged in one-to-one correspondence.
In this embodiment, the rotating V-shaped ribs clean the wellbore specifically includes scraping the wellbore wall, breaking the cuttings bed, the thick mud cake, and scraping off the wellbore wall debris. Thus, during sliding drilling or drifting operation, although the drill string does not rotate, the V-shaped edges of the self-rotating cleaning tool can rotate at a high speed due to the circulation of drilling fluid, and the drill string can still clean a drill cuttings bed, thick mud cakes and sundries of a well bore; meanwhile, in normal drilling operation, the rotation direction of the outer V-shaped edge is the same as that of the rotary column, and the well cleaning effect is enhanced; the first support ring and the second support ring can play roles in preventing clamping and supporting, and the circulation of drilling fluid in an annulus between the well wall and the well wall is not influenced, so that the well wall cleaning device can play a role in efficiently cleaning a well hole in the whole process of drilling and completion, and has the anti-clamping function.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and in particular, the technical features set forth in the various embodiments may be combined in any manner so long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
In the description of the present invention, terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, which indicate a direction or a positional relationship, are based on the direction or the positional relationship shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus/means that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus/means.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (8)
1. A self-rotating borehole cleaning tool for sliding drilling, which is characterized by comprising a first connecting member, a rotating body and a second connecting member, wherein the second connecting member is arranged at one end of the rotating body far away from the first connecting member;
The first connecting member comprises an upper joint body and a mandrel, and the mandrel is arranged in the center of the upper joint body; a first inner conical threaded hole is formed in one end, far away from the second connecting member, of the upper joint body; the mandrel is arranged below the first inner conical threaded hole; an annular cavity is formed between the outer wall of the mandrel and the upper joint body;
The mandrel comprises a first mandrel section and a second mandrel section, and the second mandrel section is arranged at one end of the first mandrel section far away from the first inner conical threaded hole; the first mandrel section is a solid mandrel section, and a first overflow hole is formed between the solid mandrel section and the first inner conical threaded hole so as to be communicated with the annular cavity and the first inner conical threaded hole; the second mandrel section is a hollow shaft section; a second overflow hole is formed between the second mandrel section and the first mandrel section so as to communicate the annular cavity and the hollow of the second mandrel section;
the rotary body is sleeved on the mandrel and connected with the mandrel through a bearing assembly; one end of the rotary body is provided with a turbine-shaped structure, and the turbine-shaped structure is arranged inside the annular cavity; a third overflow hole matched with the first overflow hole is formed in the rotary body; a first rotary sealing assembly is arranged between the inner wall of the rotary body and the second mandrel section; a second rotary sealing assembly is arranged between the outer wall of the rotary body and the upper joint body; the periphery of the rotating body is provided with V-shaped edges;
The second connecting component is of a hollow shaft structure; a third rotary sealing assembly is arranged between the inner wall of one end of the second connecting member and the outer wall of one end of the rotary body, which is far away from the annular cavity; the second mandrel section extends to the inside of the second connecting member in a cantilever manner through the center of the rotating body and is fixedly connected with the second connecting member;
Under the working state, drilling fluid entering the first inner conical threaded hole enters the annular cavity through the first overflow hole and impacts the turbine-shaped structure, the turbine-shaped structure drives the rotary body to rotate relative to the first connecting component and the second connecting component under the impact of the drilling fluid, and the rotating V-shaped arris cleans a borehole and generates turbulence opposite to the drilling direction in an annular space of a borehole wall;
the rotary body comprises a first body shaft section, a second body shaft section, a third body shaft section, a fourth body shaft section and a fifth body shaft section which are sequentially arranged from top to bottom; a first supporting ring is sleeved on the outer side of the third body shaft section; the first support ring is arranged between the fourth body shaft section and the end part of the upper joint body;
The first support ring comprises a first inner ring and a first outer ring which are concentrically arranged, a plurality of brackets are arranged between the outer side of the first inner ring and the inner side of the first outer ring, and the brackets are arranged along the radial direction of the first outer ring; two adjacent brackets, the outer wall of the first inner ring and the inner wall of the first outer ring form a liquid passing channel;
the first inner ring and the third body shaft section are arranged in a clearance way;
The outer diameter of the first outer ring is larger than the outer diameter of the circle where the V-shaped edge is located;
A second supporting ring is arranged on the outer side of the fifth body shaft section;
the second support ring is arranged in accordance with the structure of the first support ring.
2. The self-rotating wellbore cleaning tool for sliding drilling of claim 1, wherein the first body shaft section is a carrier section of the turbine-like structure, the first body shaft section being disposed in mating relation with the first mandrel section;
The outer diameter of the second body shaft section is larger than that of the first body shaft section, and the third overflow hole is formed in the second body shaft section;
the outer diameter of the third body shaft section is larger than that of the second body shaft section, the second rotary sealing assembly is arranged on the outer side of the third body shaft section, and the third body shaft section is arranged in a manner of overhanging the upper joint body;
The outer diameter of the fourth body shaft section is larger than the outer diameter of the third body shaft section;
The outer diameter of the fifth body shaft section is smaller than that of the fourth body shaft section, and the outer diameter of the fifth body shaft section is consistent with that of the third body shaft section; the third rotary sealing assembly is arranged on the outer side of the fifth body shaft section.
3. The self-rotating wellbore cleaning tool for sliding drilling of claim 2, wherein the bearing assembly comprises a first bearing assembly and a second bearing assembly, the first bearing assembly disposed between the third body shaft section and the second mandrel section;
the second bearing assembly is disposed between the fifth body shaft section and the second mandrel section.
4. The self-rotating wellbore cleaning tool for sliding drilling of claim 2, wherein one end of the second connecting member is provided with a counter bore accommodating the fifth body shaft section;
A second inner conical threaded hole is formed below the countersunk head hole; the end of the second mandrel segment is provided with a first external tapered thread that mates with the second internal tapered threaded bore.
5. The self-rotating wellbore cleaning tool for sliding drilling of claim 4, wherein an end of the second connection member remote from the rotating body is provided with a second external conical thread for interfacing with a drill pipe.
6. The self-rotating wellbore cleaning tool for sliding drilling of claim 4, wherein a distance from an end of the second mandrel segment remote from the first mandrel segment to an end of the fifth body segment is h1, a longitudinal length of the first external conical thread is h2, h1=h2.
7. The self-rotating wellbore cleaning tool for sliding drilling of claim 4, wherein a distance from an end of the second internal tapered threaded bore remote from the rotating body to an end of the second connecting member remote from the rotating body is H1, and a longitudinal length of the second external tapered thread is H2, H1 > H2.
8. The self-rotating wellbore cleaning tool for sliding drilling of any of claims 1-7, wherein the first flowbore is a plurality, the plurality of first flowbore arrays are disposed and the plurality of first flowbores are disposed obliquely;
the second overflow holes are multiple, the second overflow holes are arranged in an array, and the second overflow holes are perpendicular to the longitudinal axis of the mandrel;
The plurality of third overflow holes are arranged in a one-to-one correspondence with the plurality of second overflow holes.
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| CN115726738A (en) | 2023-03-03 |
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