CN115012831B - Natural gas hydrate exploitation drilling tool with borehole support sieve tube - Google Patents

Natural gas hydrate exploitation drilling tool with borehole support sieve tube Download PDF

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Publication number
CN115012831B
CN115012831B CN202210696834.5A CN202210696834A CN115012831B CN 115012831 B CN115012831 B CN 115012831B CN 202210696834 A CN202210696834 A CN 202210696834A CN 115012831 B CN115012831 B CN 115012831B
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China
Prior art keywords
drill bit
drill
joint
screen
gas hydrate
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CN202210696834.5A
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CN115012831A (en
Inventor
赵天奉
赵子刚
王鑫洋
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China University of Petroleum Beijing
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China University of Petroleum Beijing
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/08—Screens or liners
    • E21B43/086—Screens with preformed openings, e.g. slotted liners

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

Abstract

The invention relates to a natural gas hydrate exploitation drilling tool with a borehole support sieve tube, which comprises: a drill stem; a drill bit disposed at an end of the drill pipe for drilling into a natural gas hydrate reservoir in a first direction to form a wellbore; a screen disposed on the drill pipe, the screen having an inner diameter greater than an outer diameter of the drill bit such that the drill bit is withdrawn from the screen in a second direction, the first direction being opposite the second direction; and a connector adapted to detachably connect the screen to the drill pipe. The screen pipe is used for supporting the borehole in the first time while the operation efficiency is greatly improved, and the risks of hole shrinkage and collapse are reduced.

Description

Natural gas hydrate exploitation drilling tool with borehole support sieve tube
Technical Field
The invention relates to the field of submarine drilling equipment, in particular to a natural gas hydrate exploitation drilling tool with a borehole support sieve tube.
Background
The seabed natural gas hydrate is a reservoir which is mostly formed by loose cementation of sand and gravel particles, and when solid hydrates in gaps among the particles are subjected to phase change decomposition, a particle framework of the reservoir is easy to lose support and collapse. This feature of natural gas hydrate reservoirs presents great difficulties in drilling and completion construction and later decompression recovery. During drilling, especially directional well and horizontal well drilling, after the drilling is lifted, a well hole is easy to collapse; in production, a sand control screen is also generally required to be arranged in the well bore to filter free reservoir sand moving towards the well bore. In a limited borehole diameter, the application of sand control screens is also limited, and the thickness of the sand control material, such as metal wool, elastic fibers, etc., can reduce the effective inner diameter of the wellbore.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a natural gas hydrate production drilling tool with a wellbore support screen pipe, which has an expanded diameter drilling function, and after drilling, the screen pipe can be directly arranged in a wellbore, so as to support the wellbore and efficiently and safely complete the well.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas hydrate production drilling tool with a wellbore support screen, comprising:
a drill stem;
a drill bit disposed at an end of the drill pipe for drilling into a natural gas hydrate reservoir in a first direction to form a wellbore;
the screen pipe is arranged on the drill rod, the inner diameter of the screen pipe is larger than the outer diameter of the drill bit, so that the drill bit can be drawn out of the screen pipe in a second direction, and the first direction is opposite to the second direction; and
a connector adapted to detachably connect the screen to the drill pipe.
The drill bit is an expansion drill bit comprising:
a bit body, the bit body comprising:
a head portion having a truncated cone shape, the head portion of the bit body including a first end and a second end, an outer diameter of the first end being greater than an outer diameter of the second end, a groove being provided on an outer circumferential surface of the head portion of the bit body, the groove extending from the second end toward the first end in a first direction; and
a cylindrical tail rod, the second end of which is connected to the cylindrical tail rod; and
the telescopic block is arranged in the groove and is suitable for sliding between the first end and the second end.
The drill bit still includes:
the hydraulic cylinder is arranged on the cylindrical tail rod and pushes the telescopic block to slide from the second end to the first end;
the chain is arranged between the hydraulic cylinder and the telescopic block;
the tension spring assembly is arranged on the cylindrical tail rod, the hydraulic cylinder is arranged between the chain and the tension spring assembly, and the tension spring assembly drives the telescopic block to slide from the first end to the second end.
The extension spring subassembly includes:
the tension spring seat is arranged on the cylindrical tail rod at one end of the cylindrical tail rod opposite to the head;
and one end of the tension spring is fixed to the tension spring seat, and the other end of the tension spring is fixed to the hydraulic cylinder.
When the pressure in the hydraulic cylinder is increased, the telescopic block slides in the groove from the second end to the first end, so that the drill bit is expanded; when the pressure in the hydraulic cylinder drops, the extension spring pulls the telescopic block to slide from the first end to the second end in the groove, so that the drill bit is contracted.
The connecting piece includes first connecting piece, and first connecting piece includes:
a first sub connecting the drill bit to the drill rod at one end of the drill rod;
a hanging sleeve disposed around the first joint and connected to the screen; and
and the cylindrical bearing is arranged between the first joint and the suspension sleeve.
The connecting piece still includes the second connecting piece, and the second connecting piece includes:
a second sub connected to the drill pipe at another end of the drill pipe, the one end of the drill pipe being opposite the other end of the drill pipe;
a wear joint disposed around the second joint and connected to the screen, an outer circumferential surface of the wear joint being coated with a wear resistant layer;
a thrust bearing disposed in a radial gap between the second joint and the wear joint; and
a thrust sleeve disposed about the second joint and abutting the wear joint and the thrust bearing to resist movement of the wear joint and the thrust bearing in the second direction.
The wear joint is threaded to the screen.
The cylindrical bearing and the thrust bearing radially support the screen during drilling of the drill bit.
The screen pipes are connected in series into a whole through a coupling arranged on the outer wall of each screen pipe.
Due to the adoption of the technical scheme, the invention has the following advantages:
according to the natural gas hydrate production drilling tool with the borehole support screen pipe, after the borehole drilling with the preset aperture is completed, the drill bit can be retracted and drawn out from the screen pipe carried by the drill rod, and the screen pipe is directly left in the stratum to support the borehole. The whole set of drilling tool changes the conventional well completion procedure of firstly lifting the drilling tool and replacing slurry and then placing the sand control screen pipe, greatly improves the operation efficiency, and simultaneously supports the well hole by using the screen pipe at the first time, thereby reducing the risks of reducing and collapsing the well hole.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings.
In the drawings:
fig. 1 is a schematic view of the structural principle of a drill bit according to the present application.
FIG. 2 is a schematic structural diagram of a screen according to the present application.
FIG. 3 is a schematic view of the construction of a drill bit and screen assembly according to the present application.
The reference symbols in the drawings denote the following:
1. a drill bit;
3. a front connector;
4. a screen pipe;
5. a rear connector;
6. a drill stem;
10. head of truncated cone shape
11. Scraping knife
12. Water nozzle
13. Groove
14. Telescopic block
15. Chain
16. Hexagon bolt
17 O-shaped sealing ring
18. Hydraulic cylinder
19. Tension spring assembly
20. Cylindrical tail
31. A front drill bit joint;
32. hanging a sleeve;
33. a cylindrical bearing;
34. reducing joint
41. Coupling hoop
42. Screen pipe end pipe thread
51. A drill rod joint is arranged at the rear;
52. a wear-resistant joint;
53. a thrust bearing;
54. a thrust sleeve;
180. a hydraulic cylinder channel;
191. tension spring sheath
192. Tension spring
193. Extension spring accessory
194 tension spring seat
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated, are not intended to imply any particular meaning or importance to the contrary.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The production drilling tool with the borehole support screen pipe can directly support the sand control screen pipe in the borehole after drilling of a hydrate reservoir, effectively relieve the problems of easy shrinkage and collapse of a borehole of the hydrate reservoir and greatly improve the drilling and completion efficiency.
After the drilling tool goes into the well, a slurry pump is started, the pressure in the drilling fluid main channel is increased, high-pressure slurry enters the hydraulic cylinder channel, and the hydraulic pressure pushes the chain to move forwards and is pushed by the chain because the area of the lower end face of the hydraulic cylinder with the annular cavity is larger than that of the upper end face, and the telescopic block is pushed forwards along the dovetail groove on the drill bit. Meanwhile, the tension spring is lengthened, and the hydraulic cylinder pushes the telescopic block to move forwards to enlarge the diameter of the drill bit. The end face of the hydraulic cylinder moves forwards, the telescopic block stops moving when reaching a preset maximum position, at the moment, drilling fluid does not enter the hydraulic cylinder any more, the pressure in the hydraulic cylinder is stable, the diameter of a drill bit does not change any more, and drilling operation is started.
When the ground stops drilling, after the pressure of the mud pump is reduced, the pressure in the drilling fluid main channel is reduced, the pressure in the hydraulic cylinder of the annular cavity is also reduced, the hydraulic cylinder is reset under the action of the tension spring, the diameter of the drill bit is reduced, and the drill can be lifted from the well hole supporting sieve tube arranged later.
The back of the expansion bit may be placed with a support screen, which may be described as:
the front drill rod joint and the reducing joint are connected together by screw threads and are connected on a drill rod, the hanging sleeve is sleeved in the drill rod, and then the cylindrical bearing sleeve is installed on the reducing joint and is welded after the installation. The support screen (multiple screens can be accessed) is screwed into the suspension sleeve.
At the end of the supporting screen pipe/supporting screen pipe string, a wear-resistant joint at the end of the screen pipe is connected, a rear drill pipe joint is connected at the position corresponding to the drill pipe, and a thrust bearing is arranged in a conical gap formed by the two.
During drilling, the drill bit and drill pipe rotate, and the cylindrical bearing housing and thrust bearing radially support a plurality of support screen/support screen strings.
During drilling, the cylindrical bearing sleeve drives the suspension sleeve and simultaneously drives the plurality of support sieve tubes/support sieve tube strings to move forwards along with the drill bit;
during the drilling, the mud pressure in the drill pipe is reduced, the drill bit retracts and passes through the suspension sleeve and the wear-resistant joint at the tail end of the sieve pipe, a plurality of supporting sieve pipes/supporting sieve pipes are strung in a borehole to be supported, and meanwhile sieve pipe well completion is completed.
By means of expanding drill bits
After the drilling tool is used for descending a well, when liquid is added through the drilling fluid, the liquid moves towards the underground through the central drilling hole of the drill rod, and the liquid enters the hydraulic cylinder channel through the drilling fluid main channel and reaches the hydraulic cylinder channel. Because the area of the lower end surface of the hydraulic cylinder is designed to be larger than that of the upper end surface of the hydraulic cylinder, the force acting on the lower end surface is larger than that acting on the upper end surface, and because the two ends are sealed, the hydraulic cylinder is forced to push the chain to move forwards and push the telescopic block to push forwards along the dovetail groove of the main body. Meanwhile, as the two ends of the tension spring are respectively fixed on the hydraulic cylinder surface and the tension spring seat surface, the tension spring is stretched, and the hydraulic cylinder pushes the telescopic block to move forwards and expand the diameter of the drill bit. The hydraulic cylinder moves forwards, the hydraulic cylinder channel moves backwards relative to the main body, when the hydraulic cylinder channel is moved to the position, the telescopic block stops moving when reaching the preset maximum position, and at the moment, the drilling fluid does not enter the hydraulic cylinder any more and drilling is started.
When the ground stops drilling, the pressure of the drilling fluid is reduced, the pressure in the hydraulic cylinder is reduced, the hydraulic cylinder is pulled back to reset under the action of the tension spring, the chain-linked chain stretching locking block returns to the original position, and the diameter of the drill bit is reduced.
The inner angle of the dovetail groove on the drill bit is smooth, and the processed telescopic block can freely move in the dovetail groove.
The drill bit and the hydraulic cylinder keep sealing when moving.
The two ends of the tension spring are fixed and can not loosen or fall off during movement.
The telescopic block is inserted into a dovetail groove of the main body, the O-shaped sealing ring is installed on the hydraulic cylinder and then inserted into the main body, and the connecting shaft and the fixing screw of the telescopic block and the main body are installed.
After the tension spring is inserted into the main body, the hydraulic cylinder and the tension spring are fixed, the tension spring seat is installed on the main body, and the tension spring seat are fixed.
And finally, installing the tension spring sheath and the tension spring accessory.
The method comprises the steps of firstly connecting a drill rod joint piece and a reducing joint piece through threads, then sleeving a suspension sleeve piece, then installing (welding) a cylindrical bearing sleeve (comprising a bearing sleeve and cylindrical balls) on the reducing joint, finally connecting the suspension sleeve piece with a support sieve tube, and installing a plurality of sieve tubes as required.
The suspension sleeve is screwed with the support sieve tube to keep a certain gap between the cylindrical bearing sleeve and the suspension sleeve so as to ensure that the suspension sleeve can be pulled. As the drill bit and drill rod rotate, the bearing inner sleeve turns the cylindrical rollers (i.e., cylindrical beads) to reduce friction.
The tail end of the screen pipe is provided with a screen pipe tail end wear-resisting joint, a rear drill rod joint, a drill rod joint and a cylindrical thrust bearing.
Fig. 1 is a schematic view of a drill bit according to the present invention, which is an expansion drill bit, as shown in fig. 1. After the tool is lowered into the well while drilling, liquid is added through the drilling fluid, the liquid moves downhole through the central drilling hole of the drill rod, and the liquid enters the hydraulic cylinder channel 180 through the main drilling fluid channel. Since the area of the lower end face of the hydraulic cylinder is designed to be larger than the area of the upper end face of the hydraulic cylinder, the force acting on the lower end face is larger than the force acting on the upper end face, and since the two ends are sealed, this forces the hydraulic cylinder 18 to push the chain 15 forward and push the pads 14 forward along the grooves 13 (e.g., dovetail grooves) of the body. Meanwhile, since both ends of the tension spring 192 are fixed to the end surface of the hydraulic cylinder 18 and the end surface of the tension spring seat 194, respectively, the tension spring 192 is elongated, and the hydraulic cylinder 18 pushes the telescopic block 14 to move forward and enlarge the diameter of the drill bit 1. The hydraulic cylinder 18 moves forward and the cylinder channel 180 moves backward relative to the body, and when the cylinder channel 180 moves to a predetermined position, the telescopic block 14 stops moving when reaching a predetermined maximum position, and at this time, the drilling fluid no longer enters the hydraulic cylinder 18, and the drill bit 1 starts to drill.
When the ground stops drilling, the drilling fluid pressure drops, the pressure in the hydraulic cylinder 18 drops, the hydraulic cylinder 18 is pulled back to be reset under the action of the pulling force of the tension spring 192, the chain 15 stretches the locking block 14 to return to the original position, and therefore the outer diameter of the drill bit 1 is reduced.
The inner angles of the dovetail grooves on the drill bit 1 are smooth, and the telescopic blocks 14 can freely move in the dovetail grooves after machining.
The drill bit 1 remains sealed from the hydraulic cylinder 18 during movement.
The two ends of the tension spring 192 are fixed and cannot be loosened or fall off during movement.
The telescopic block 14 is firstly inserted into a dovetail groove of a main body of the drill bit 1, then the hydraulic cylinder 18 is installed with the O-shaped sealing ring 17 and then inserted into the main body of the drill bit 1, and a connecting shaft and a fixing screw of the telescopic block and the O-shaped sealing ring are installed.
After the tension spring 192 is inserted into the main body of the drill bit 1, the hydraulic cylinder 18 and the tension spring 192 are fixed, the tension spring holder 194 is mounted on the main body of the drill bit 1, and the tension spring 192 and the tension spring holder 194 are fixed.
Finally, the tension spring sheath 191 and the tension spring attachment 193 are mounted on the body of the drill bit 1.
A gas hydrate production drilling tool with wellbore support screen according to the application, comprising:
a drill rod 6;
a drill bit 1, the drill bit 1 being provided at an end of a drill pipe 6 for drilling into a natural gas hydrate reservoir in a first direction to form a wellbore;
a screen 4, the screen 4 being disposed on the drill pipe 1, the screen 4 having an inner diameter larger than an outer diameter of the drill bit 6 so that the drill bit 1 is drawn out of the screen 4 in a second direction, the first direction being opposite to the second direction; and
a connector adapted to detachably connect the screen 4 to the drill pipe 6.
The drill bit 1 is an expansion drill bit, comprising: a bit body, the bit body comprising: a head 10 and a cylindrical tail stem 20. The head 10 has a truncated cone shape, and the head 10 of the bit body includes a first end and a second end, and a groove 13 is provided on an outer circumferential surface of the head of the bit body, and the groove 13 extends from the second end toward the first end in a first direction. The second end is connected to a cylindrical tail rod 20, the first end having an outer diameter greater than the outer diameter of the second end.
A telescopic block 14 is arranged in the recess 13 and is adapted to slide between the first and second ends.
The drill bit 1 further comprises: a hydraulic cylinder 18, a chain 15 and a tension spring assembly 19. A hydraulic cylinder 18 is arranged on the cylindrical tail rod 20, and the hydraulic cylinder 18 pushes the telescopic block 14 to slide from the second end to the first end; the chain 15 is arranged between the hydraulic cylinder 18 and the telescopic block 14; tension spring subassembly 19 sets up on cylindrical tail-boom 20, and pneumatic cylinder 18 sets up between chain 15 and tension spring subassembly 19, and tension spring subassembly 19 drives flexible piece 14 and slides from first end towards the second end.
The extension spring subassembly includes: a tension spring seat 194 and a tension spring 192. A tension spring seat 194 is provided on the cylindrical tail rod 20 at an end of the cylindrical tail rod 20 opposite the head 10; one end of a tension spring 192 is fixed to the tension spring seat 194, and the other end of the tension spring 192 is fixed to the hydraulic cylinder 18.
As pressure increases in the cylinder 18, the pads 14 slide in the grooves 13 from the second end towards the first end, causing the bit to expand; when pressure drops in the hydraulic cylinder 18, the tension spring 192 pulls the telescoping block 14 to slide in the recess 13 from the first end toward the second end, causing the drill bit to retract.
The connecting member comprises a first connecting member, also called front connecting member 3. The first connecting member 3 includes: a first joint 31, a suspension jacket 32 and a cylindrical bearing 33. The first joint 31 is a front bit joint 31. A first coupling 31 connects the drill bit 1 to the drill rod 6 at one end of the drill rod 6; a suspension jacket 32 is disposed around the first sub 31 and attached to the screen 4. The cylindrical bearing 33 is hung on the sleeve 32 at the first joint 31. A reducer joint 34 is provided between the first joint 31 and the cylindrical bearing 33 to facilitate connection of the leading bit joint 31 to the drill pipe 6.
The connection also comprises a second connection, also called rear connection 5. The second connecting member 5 includes: a second joint 51, a wear joint 52, a thrust bearing 53 and a thrust sleeve 54. A second joint, also called rear drill rod joint 51, is connected to drill rod 6 at the other end of drill rod 6, said end of drill rod 6 being opposite to said other end of drill rod; a wear joint 52 is disposed around the second joint 51 and connected to the screen 4, and an outer circumferential surface of the wear joint 52 is coated with a wear-resistant layer; a thrust bearing 53 is provided in the radial gap between the second joint 51 and the wear joint 52; a thrust sleeve 54 is disposed about the second joint 51 and abuts the wear joint 52 and the thrust bearing 53 to prevent movement of the wear joint 52 and the thrust bearing 53 in the second direction.
The wear joint 52 is threaded to the screen 4. For example, screen end pipe threads 42 are provided at the end of screen 4, and screen end pipe threads 42 mate with the external threads of wear joint 52 to threadably connect wear joint 52 to screen 4.
The cylindrical bearing 33 and the thrust bearing 53 radially support the screen 4 during drilling of the drill bit 1.
The screen pipes 4 are connected in series by a collar 41 provided on the outer wall of the screen pipe 4.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A gas hydrate production drilling tool carrying a wellbore support screen, comprising:
drilling a rod;
a drill bit disposed at an end of the drill pipe for drilling into a natural gas hydrate reservoir in a first direction to form a wellbore;
a screen disposed on the drill pipe, the screen having an inner diameter greater than an outer diameter of the drill bit such that the drill bit is withdrawn from the screen in a second direction, the first direction being opposite the second direction; and
a connector adapted to detachably connect the screen to the drill pipe;
the drill bit is an expandable drill bit comprising:
a bit body, the bit body comprising:
a head portion having a frusto-conical shape, the head portion of the bit body including a first end and a second end, an outer diameter of the first end being greater than an outer diameter of the second end, a groove being provided on an outer circumferential surface of the head portion of the bit body, the groove extending from the second end in the first direction toward the first end; and
a cylindrical tail rod, the second end connected to the cylindrical tail rod; and
a telescoping block disposed in the groove adapted to slide between the first end and the second end.
2. A gas hydrate producing drilling tool with wellbore support screen according to claim 1, wherein the drill bit further comprises:
the hydraulic cylinder is arranged on the cylindrical tail rod and pushes the telescopic block to slide from the second end to the first end;
the chain is arranged between the hydraulic cylinder and the telescopic block;
the tension spring assembly is arranged on the cylindrical tail rod, the hydraulic cylinder is arranged between the chain and the tension spring assembly, and the tension spring assembly drives the telescopic block to move towards the first end and the second end to slide.
3. A gas hydrate production drilling tool with wellbore support screen according to claim 2, wherein the tension spring assembly comprises:
a tension spring seat disposed on the cylindrical tail rod at an end of the cylindrical tail rod opposite the head;
a tension spring having one end fixed to the tension spring seat and the other end fixed to the hydraulic cylinder.
4. A gas hydrate production drilling tool with wellbore support screen according to claim 3, wherein the pads slide in the grooves from the second end towards the first end as the pressure in the hydraulic cylinder increases, causing the drill bit to expand; when the pressure in the hydraulic cylinder is reduced, the extension spring pulls the telescopic block to slide in the groove from the first end to the second end, so that the drill bit is contracted.
5. A gas hydrate production drilling tool carrying a wellbore support screen according to claim 1, wherein the connection comprises a first connection comprising:
a first sub connecting the drill bit to the drill rod at one end of the drill rod;
a suspension jacket disposed about the first joint and connected to the screen; and
a cylindrical bearing disposed between the first joint and the suspension sleeve.
6. A gas hydrate production drilling tool with wellbore support screen according to claim 5, wherein the connections further comprise a second connection comprising:
a second sub connected to the drill pipe at another end of the drill pipe, the one end of the drill pipe being opposite the other end of the drill pipe;
a wear joint disposed about the second joint and connected to the screen, an outer circumferential surface of the wear joint coated with a wear resistant layer;
a thrust bearing disposed in a radial gap between the second joint and the wear joint; and
a thrust sleeve disposed about the second joint and abutting the wear joint and thrust bearing to resist movement of the wear joint and thrust bearing in the second direction.
7. A gas hydrate production drilling tool with wellbore support screen according to claim 6, wherein the wear joints are connected to the screen by means of threads.
8. A gas hydrate producing drilling tool with wellbore support screen according to claim 6, wherein the cylindrical bearing and the thrust bearing radially support the screen during drilling of the drill bit.
9. A gas hydrate production drilling tool with wellbore support screen according to claim 1, wherein a plurality of screens are provided on the outer wall of the screens.
CN202210696834.5A 2022-06-20 2022-06-20 Natural gas hydrate exploitation drilling tool with borehole support sieve tube Active CN115012831B (en)

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CN202210696834.5A CN115012831B (en) 2022-06-20 2022-06-20 Natural gas hydrate exploitation drilling tool with borehole support sieve tube

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CN115012831B true CN115012831B (en) 2023-04-07

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