CN108894732A - Double-wall drill pipe - Google Patents
Double-wall drill pipe Download PDFInfo
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- CN108894732A CN108894732A CN201811106495.0A CN201811106495A CN108894732A CN 108894732 A CN108894732 A CN 108894732A CN 201811106495 A CN201811106495 A CN 201811106495A CN 108894732 A CN108894732 A CN 108894732A
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- wall
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- short joint
- shoulder surface
- short circuit
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- 238000007789 sealing Methods 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011324 bead Substances 0.000 description 18
- 238000005553 drilling Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of double-wall drill pipes, including the upper short circuit, outer tube and lower short circuit being successively threadedly coupled from top to bottom, and the inner tube being arranged in outer tube hub duct；Upper short circuit and lower short circuit are provided in the axial direction with central duct and eccentric duct, inner tube is sleeved on the double-wall pipe for being formed in outer tube and having central duct and annulus in the form of there are gap, and both ends are separately fixed on the hole wall of the central duct of short circuit and lower short circuit, the central duct of the central duct and inner tube that make short circuit and lower short circuit, which is interconnected, forms the first mistake liquid channel, and the eccentric duct of the two then with it is interior, the annulus formed between outer tube wall, which is interconnected, forms the second mistake liquid channel, shoulder sealing is formed between two components being threadedly coupled simultaneously, penetrate through the first liquid channel excessively mutually not with the second liquid channel excessively；The double-wall drill pipe effectively prevent inner tube to move up and down in use, while seal and pressure bearing ability and reliability between the longer inner and outer pipe of length greatly improved.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a double-wall drill rod.
Background
The double-wall drill pipe drilling method refers to a method for drilling by using double-wall drill pipes and other auxiliary equipment, and mainly comprises low-pressure drilling, central sampling drilling, RDM technology, double-wall gas-filled drilling and the like. The method is continuously paid attention to and popularized and applied in the fields of the earth and mine department and oil drilling.
The double-wall drill rod with the structure has the problems that ① the inner drill rod and the outer drill rod are long and have lengths of about 10m, concentricity of the inner pipe and the outer pipe is difficult to guarantee, so that a gap between a male joint and a female joint of the inner pipe in a plugging and sealing manner is overlarge, a sealing ring under high pressure is easily extruded into the gap between the male joint and the female joint to damage the sealing ring, the sealing bearing capacity and reliability are reduced, ② the drill rod is frequently disassembled and possibly causes the curling and crushing of the sealing ring, the sealing bearing capacity and reliability are reduced, ③ the inner pipe is also required to be hung on the step at the upper part of the outer pipe, the inner pipe is easy to be hung on the step at the upper part of the outer pipe due to the small step surface and the vertical vibration of the inner pipe in the using process of the double-wall drill rod, the vertical vibration of the inner pipe can greatly reduce the service life of the sealing ring, and the double-wall drill rod sealing method is required to be further promoted to be used.
Disclosure of Invention
The invention aims to provide a double-wall drill rod which can effectively improve the sealing and bearing capacity and reliability between an inner pipe and an outer pipe.
Therefore, the technical scheme of the invention is as follows:
a double-wall drill rod comprises an upper short joint, an outer pipe, a lower short joint and an inner pipe sleeved in a central pore passage of the outer pipe, wherein the upper short joint, the outer pipe and the lower short joint are sequentially connected from top to bottom; wherein,
an inner thread used for connecting the bottom end of the lower short joint is arranged on the inner wall of the top end of the upper short joint, an outer thread used for connecting the top end of the outer pipe is arranged on the outer wall of the bottom end of the upper short joint, and a central pore passage A and an eccentric pore passage A are respectively arranged on the upper short joint along the axial direction; the hole wall of the bottom end of the central hole B is sunken to form a first annular step;
the inner wall of the top end of the outer pipe is provided with an internal thread for connecting the bottom end of the upper short circuit, and the outer wall of the bottom end is provided with an external thread for connecting the top end of the lower short circuit;
the inner wall of the top end of the lower short joint is provided with an internal thread used for connecting the bottom end of the outer pipe, the outer wall of the bottom end is provided with an external thread used for connecting the top end of the upper short joint, and the upper part of the lower short joint is respectively provided with a central pore passage C and an eccentric pore passage B along the axial direction; the hole wall of the top end of the central hole C is sunken to form a second annular step;
the inner pipe is sleeved in the outer pipe in a form of gaps to form a double-wall pipe with a central pore passage B and an annular pore passage A; the top end of the inner tube is inserted into the central hole A of the upper short joint, the top surface of the inner tube abuts against the lower end face of the first annular step, the bottom end of the inner tube is inserted into the central hole C of the lower short joint, the bottom surface of the inner tube abuts against the upper end face of the second annular step, the central hole A, the central hole B and the central hole C form a communicated first liquid passing channel, and the eccentric hole A, the annular hole A and the eccentric hole B form a communicated second liquid passing channel.
Wherein, the outer tube adopts conventional single wall drilling rod, and the inner tube then preferably adopts aluminium alloy pipe, effectively lightens holistic weight when guaranteeing the intensity demand of double-walled drilling rod.
Preferably, the upper short circuit consists of an outer short circuit and an inner short circuit arranged in a central pore passage of the outer short circuit; the inner wall of the top end of the outer short circuit is provided with an internal thread used for connecting the bottom end of the lower short circuit, and the outer wall of the bottom end is provided with an external thread used for connecting the top end of the outer pipe; a central pore passage A and an eccentric pore passage A are respectively arranged on the inner short joint along the axial direction;
the inner short circuit and the outer short circuit are integrally processed and formed; or the inner short circuit and the outer short circuit are welded and fixed together or fixed together by connecting and fixing pieces such as fastening screws and the like; or the outer wall of the top end of the inner short circuit is provided with an annular flange, and the inner wall of the outer short circuit below the internal thread is correspondingly provided with a thrust step, so that the inner short circuit is mounted on the thrust step of the outer short circuit through the annular flange, and the inner short circuit is prevented from descending relative to the outer short circuit.
Preferably, a sealing element A is arranged between the outer wall of the inner pipe and the hole wall of the central hole A, and a sealing element B is arranged between the outer wall of the inner pipe and the hole wall of the central hole C.
Wherein, the sealing element A13 and the sealing element B53 are at least one sealing ring arranged between the outer wall of the inner pipe and the corresponding hole wall, or at least one sealing ring and a sealing ring retainer ring positioned at the upper side and/or the lower side of each sealing ring. At least one guide ring may optionally be provided adjacent the seal ring to reduce seal eccentric extrusion.
Preferably, the external screw thread top of short circuit is equipped with annular circular bead down, and the circular bead face C of annular circular bead closely laminates with the annular circular bead face A that the top end face machining of last short circuit formed and forms the circular bead sealed, it has annular circular bead to go up the internal thread below of short circuit, and the circular bead face B of annular circular bead closely laminates with the annular circular bead face D that the bottom end face machining of short circuit formed down and forms the circular bead sealed, make when two double-walled drilling rod threaded connection fixed backs, the first liquid passageway of crossing of two double-walled drilling rods communicates each other, the second of two double-walled drilling rods communicates each other through the liquid passageway, and the first liquid passageway of crossing of intercommunication and the second of intercommunication are crossed the circular bead sealed each other that forms between liquid passageway through circular bead face B and the circular bead face.
Preferably, an annular groove provided with a sealing member C is provided on the shoulder surface B or the shoulder surface D, so that the sealing member C seals between the shoulder surface B and the shoulder surface D.
Preferably, the shoulder surface B and the shoulder surface D are processed into mutually matched conical surfaces, and an annular groove provided with a sealing element C is formed in the shoulder surface B or the shoulder surface D, so that sealing is formed between the shoulder surface B and the shoulder surface D through the sealing element C;
more preferably, the taper angle of the shoulder surface B is equal to and 90 ° to the taper angle of the shoulder surface D.
Preferably, the sealing element C is an O-shaped sealing ring, a rectangular sealing ring or a combined sealing gasket formed by vulcanizing rubber and a metal ring into a whole.
Preferably, circular bead face B processes to the interior cylindrical surface that the inboard is sunken, and circular bead face D processes to protruding outside and outer cylindrical surface of mutually supporting with interior cylindrical surface, is provided with a U-shaped sealing washer including between cylindrical surface and the outer cylindrical surface, makes circular bead face B and circular bead face D between form sealedly through the U-shaped sealing washer.
Preferably, at least one centralizer is arranged between the inner pipe and the outer pipe, the inner pipe and the outer pipe are concentrically arranged, and a plurality of liquid passing channels distributed along the circumferential direction are formed in the outer wall of the centralizer.
Compared with the prior art, the double-wall drill rod has the beneficial effects that:
1) the upper short joint and the lower short joint are arranged to effectively prevent the inner pipe from jumping up and down in the using process, the precision and the quality of indoor assembly of the inner pipe and the outer pipe are improved, the inner pipe and the outer pipe are connected in a sealing mode, disassembly on a well is not needed, and therefore the sealing pressure-bearing capacity and the reliability between the inner pipe and the outer pipe which are long in length are greatly improved;
2) the upper short circuit and the lower short circuit are shorter in size, so that the processing precision of the upper short circuit and the lower short circuit is improved, and the sealing pressure grade and the reliability of the upper short circuit and the lower short circuit after the upper short circuit and the lower short circuit are connected and fixed are further improved;
3) when two double-walled drilling rods are connected, the sealing element is arranged on the plane shoulder surface matched with each other or the conical surface shoulder surface matched with each other between the upper short joint and the lower short joint, so that the problems of distortion, falling and eccentricity caused by repeated disassembly of the sealing element are solved, and the service life of the sealing element is prolonged.
Drawings
FIG. 1 is a schematic structural view of a double-walled drill rod according to example 1 of the present invention;
FIG. 2 is a schematic structural diagram of the threaded connection state of an upper short joint and a lower short joint of two double-wall drill rods in the embodiment 1 of the invention;
FIG. 3 is a schematic structural diagram of the threaded connection state of an upper short joint and a lower short joint of two double-wall drill rods in the embodiment 2 of the invention;
FIG. 4 is a structural schematic diagram of the threaded connection state of an upper short joint and a lower short joint of two double-wall drill rods in the embodiment 3 of the invention;
FIG. 5 is a schematic structural diagram of the threaded connection state of an upper short joint and a lower short joint of two double-wall drill rods in the embodiment 4 of the invention;
FIG. 6 is a schematic structural diagram of the threaded connection state of an upper short joint and a lower short joint of two double-wall drill rods in the embodiment 5 of the invention;
FIG. 7 is an enlarged partial schematic view of FIG. 1;
fig. 8 is a schematic view of the structure of the double wall of embodiment 6 of the present invention.
In the figure, 1, an upper short joint, 2, an outer pipe, 3, an inner pipe, 4, a centralizer, 5, a lower short joint, 10, a shoulder surface B, 11, an eccentric hole A, 12, a central hole A, 13, a sealing member A, 14, a shoulder surface A, 15, an inner short joint, 16, an outer short joint, 17, a thrust step, 20, an annular hole A, 30, a central hole B, 40, a liquid passing channel C, 50, a shoulder surface D, 51, an eccentric hole B, 52, a central hole C, 53, a sealing member B, 54, a shoulder surface C, 60, a sealing member C, 1301, an O-shaped rubber ring, 1302, an O-shaped sealing ring, 1303 and a guide ring.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
Example 1
As shown in fig. 1, the double-wall drill rod comprises an upper short joint 1, an outer pipe 2 and a lower short joint 5 which are sequentially connected from top to bottom, and an inner pipe 3 sleeved in a central hole of the outer pipe 2; wherein,
the upper short joint 1 is of a cylindrical structure, an internal thread concentric with an outer cylindrical surface is processed on the inner wall of the top end of the upper short joint, an external thread concentric with the outer cylindrical surface is processed on the outer wall of the bottom end of the upper short joint, and a central hole passage A12 and an eccentric hole passage A11 which are vertically communicated are respectively axially arranged on the end surface below the internal thread;
the outer pipe 2 is a conventional single-wall drill rod, and the inner wall of the top end of the outer pipe is provided with an internal thread and the outer wall of the bottom end of the outer pipe is provided with an external thread; the internal thread processed on the inner wall of the top end of the outer pipe 2 is matched with the external thread processed on the outer wall of the bottom end of the upper short joint 1, so that the outer pipe 2 and the upper short joint 1 are fixedly connected through threads;
the lower short joint 5 is of a cylindrical structure, an internal thread concentric with the outer cylindrical surface is processed on the inner wall of the top end of the lower short joint, an external thread concentric with the outer cylindrical surface is processed on the outer wall of the bottom end of the lower short joint, and a central pore passage C52 and an eccentric pore passage B51 which are vertically communicated are respectively axially arranged at the center and the adjacent side of the end surface below the internal thread; the internal thread processed at the top end of the lower short joint 5 is matched with the external thread processed at the bottom end of the outer pipe 2, so that the outer pipe 2 and the lower short joint 5 are connected and fixed in a threaded manner;
the inner pipe 3 is an aluminum alloy pipe, and is sleeved in the outer pipe 2 in a gap-existing mode to form a double-wall pipe with a central duct B30 and an annular duct A20; meanwhile, the inner pipe 3 and the outer pipe 2 are concentrically arranged by respectively sleeving and fixing two centralizers 4 on the upper part and the lower part of the outer wall of the inner pipe 3; a plurality of liquid passing channels 40 uniformly distributed along the circumferential direction are formed in the outer wall of the centralizer 4, so that liquid flowing to the centralizer 4 continuously flows into the annular space below the centralizer through the liquid passing channels 40;
the hole wall of the bottom end of the central hole A12 is sunken to form a first annular step, the hole wall of the top end of the central hole C52 is sunken to form a second annular step, so that the top end of the inner tube 3 is inserted into the central hole A12 of the upper short joint 1, the top surface of the inner tube is abutted against the lower end surface of the first annular step, the bottom end of the inner tube 3 is inserted into the central hole C52 of the lower short joint 5, and the bottom surface of the inner tube is abutted against the upper end surface of the second annular step, at the moment, the central hole A12, the central hole B30 and the central hole C52 form a communicated first liquid passing channel, and the eccentric hole A11, the annular hole A20 and the eccentric hole B51 form a communicated second liquid; in order to ensure good sealing performance between the first liquid passing channel and the second liquid passing channel, a sealing element A13 is arranged between the outer wall of the inner pipe 2 and the hole wall of the central hole passage A12, and a sealing element B53 is arranged between the outer wall of the inner pipe 2 and the hole wall of the central hole passage C52, specifically, as shown in FIG. 7, the sealing element A13 comprises two O-shaped rubber rings 1301, four O-shaped sealing ring retaining rings 1302 and a guide ring 1303; three annular grooves are arranged on the hole wall of a central hole passage A12 and the hole wall of a central hole passage C52 which are in contact with the outer wall of the inner pipe 2 from top to bottom at intervals, a guide ring 1303 is arranged in the annular groove in the middle, O-shaped rubber rings 1301 are respectively arranged in the annular grooves on two sides, and a sealing ring retainer ring 1302 is respectively arranged on the groove wall on two sides of each O-shaped rubber ring 1301 in the annular groove; the configuration and installation of the seal B53 were identical to those of the seal a13 described above.
Before the double-wall drill pipe is used, a plurality of same double-wall drill pipes are sequentially connected end to form a pipe column with the length being matched with the well condition. For the stability and the leakproofness of the tubular column that form after guaranteeing many double-walled drilling rods to connect good, as shown in fig. 2, the internal thread of processing on the inner wall of last short circuit 1 top is mutually supported with the external screw thread of processing on the outer wall of short circuit 5 bottom down, make and pass through threaded connection between the last short circuit 1 of the lower short circuit 5 of last double-walled drilling rod and the next double-walled drilling rod fixed, simultaneously, it is sealed with formation circular bead between the short circuit 5 down to go up short circuit 1, make the first liquid passageway of crossing of two double-walled drilling rods that are connected communicate each other, the second of two double-walled drilling rods that are connected is crossed the liquid passageway and is communicated each other, and the first liquid passageway that crosses that is linked together crosses does not link.
Specifically, the shoulder seal is formed in the following manner: the hole wall of the top end of a central hole passage A12 of the upper short joint 1 is sunken to form a third annular step, the center of the bottom end of the lower short joint 5 extends downwards along the axial direction to form a cylindrical protrusion, the cylindrical protrusion is concentric with the central hole passage C52, and the eccentric hole passage B51 is located on the adjacent side of the cylindrical protrusion; the outer diameter of the cylindrical bulge is matched with the aperture above the third annular step, so that the cylindrical bulge is inserted into the central hole passage A12 and the bottom end of the cylindrical bulge is pressed on the upper end surface of the third annular step in a threaded connection and fixed state of the upper short joint 1 and the lower short joint 5; the upper end surface of the third annular step and the bottom end surface of the cylindrical protrusion are respectively processed into an annular shoulder surface B10 and an annular shoulder surface D50 which can be tightly attached to form shoulder sealing; an annular shoulder is arranged above the external thread of the lower short joint 5, and a shoulder surface C54 of the annular shoulder is tightly attached to an annular shoulder surface A14 formed by processing the end surface of the top end of the upper short joint 1 to form shoulder sealing; in the embodiment, the shoulder surface B10 and the shoulder surface a14 are machined into planes perpendicular to the axis of the internal thread of the upper short joint 1, and the shoulder surface D50 and the shoulder surface C54 are machined into planes perpendicular to the axial direction of the external thread of the lower short joint 5.
Example 2
As shown in fig. 3, the structure of the double-wall drill rod is substantially the same as that of the double-wall drill rod of example 1, except that: a sealing member C60 which is matched with the shoulder surface 50 is arranged between the shoulder surface B10 and the shoulder surface D50 of the upper short circuit 1, so that a seal is formed between the shoulder surface B10 and the shoulder surface D50 through the sealing member C60; wherein, the sealing element C60 is a combined sealing gasket formed by vulcanizing rubber and a metal ring into a whole.
Example 3
As shown in fig. 4, the structure of the double-wall drill rod is substantially the same as that of the double-wall drill rod of example 1, except that: the end face below the internal thread of the upper joint 1 is processed into a shoulder face B10 matched with the annular shoulder face D50, an annular groove with a rectangular ring-shaped section is formed in the shoulder face B10, and a rectangular sealing ring C60 is arranged in the annular groove, so that the shoulder face B10 and the shoulder face D50 are sealed through the rectangular sealing ring; wherein, the rectangle sealing washer is rectangle rubber circle.
Example 4
As shown in fig. 5, the structure of the double-wall drill rod is substantially the same as that of the double-wall drill rod of example 1, except that: processing a shoulder surface B10 of the upper short circuit 1 into a conical surface with the inner diameter gradually reduced from top to bottom, correspondingly processing a cylindrical protrusion of the lower short circuit 5 into a mechanism with the upper outer diameter larger than the lower outer diameter, and processing the reducing part into a conical surface matched with the shoulder surface B10 to form a shoulder surface D50; an annular groove is formed in the shoulder surface B10, an O-shaped sealing ring C60 is arranged in the annular groove, and sealing is formed between the shoulder surface B10 and the shoulder surface D50 through the O-shaped sealing ring C60; the angle of the taper angle formed by the shoulder surface B10 and the shoulder surface D50 which are machined to be tapered is 90 °.
Example 5
As shown in fig. 6, the structure of the double-wall drill rod is substantially the same as that of the double-wall drill rod of example 1, except that: shoulder surface B10 processes for the interior cylindrical surface that is sunken to the inboard, and shoulder surface D50 processes for protruding outside and can mutually support outer cylindrical surface with interior cylindrical surface, is provided with a U-shaped sealing washer C60 between interior cylindrical surface and outer cylindrical surface, makes between shoulder surface B10 and the shoulder surface D50 form sealedly through U-shaped sealing washer C60.
Example 6
As shown in fig. 8, the structure of the double-wall drill rod is substantially the same as that of the double-wall drill rod of example 1, except that: the upper short circuit 1 is formed by combining an outer short circuit 16 and an inner short circuit 15 arranged in a central pore passage of the outer short circuit 16; the outer short joint 16 is of a cylinder structure, an inner thread used for connecting the bottom end of the lower short joint 5 is arranged on the inner wall of the top end of the outer short joint, an outer thread used for connecting the top end of the outer pipe 2 is arranged on the outer wall of the bottom end of the outer short joint, and a thrust step 17 is arranged on the inner wall of the outer short joint 16 below the inner thread; correspondingly, an annular flange is arranged on the outer wall of the top end of the inner short circuit 15, so that the inner short circuit 15 is installed on a thrust step 17 of the outer short circuit 16 through the annular flange; the inner short joint 15 is a cylindrical structure, and a central hole A12 and an eccentric hole A11 are respectively formed in the inner short joint along the axial direction.
For the double-wall drill rod described in the above embodiment 6, the outer short joint 16 may be formed as an integral structure with the outer pipe 2.
When the double-wall drill rod is hoisted, transported and vertically placed, the thread protector is installed at the lower end of the lower short joint 5 to prevent damage to the external threads and other matching surfaces of the lower short joint 5.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A double-wall drill rod is characterized by comprising an upper short joint (1), an outer pipe (2), a lower short joint (5) and an inner pipe (3) sleeved in a central hole of the outer pipe (2), wherein the upper short joint, the outer pipe (2) and the lower short joint are sequentially connected from top to bottom; wherein,
an internal thread used for connecting the bottom end of the lower short joint (5) is arranged on the inner wall of the top end of the upper short joint (1), an external thread used for connecting the top end of the outer pipe (2) is arranged on the outer wall of the bottom end, and a central pore passage A (12) and an eccentric pore passage A (11) are respectively arranged on the upper short joint (1) along the axial direction; the hole wall of the bottom end of the central hole B (12) is sunken inwards to form a first annular step;
the inner wall of the top end of the outer pipe (2) is provided with an internal thread for connecting the bottom end of the upper short joint (1), and the outer wall of the bottom end is provided with an external thread for connecting the top end of the lower short joint (5);
an internal thread used for connecting the bottom end of the outer pipe (2) is arranged on the inner wall of the top end of the lower short joint (5), an external thread used for connecting the top end of the upper short joint (1) is arranged on the outer wall of the bottom end, and a central hole C (52) and an eccentric hole B (51) are respectively arranged on the lower short joint (5) along the axial direction; the hole wall of the top end of the central hole C (52) is sunken inwards to form a second annular step;
the inner pipe (3) is sleeved in the outer pipe (2) in a form of gaps to form a double-wall pipe with a central pore passage B (30) and an annular pore passage A (20); the top end of the inner pipe (3) is inserted into a central hole passage A (12) of the upper short joint (1), the top surface of the inner pipe abuts against the lower end face of the first annular step, the bottom end of the inner pipe (3) is inserted into a central hole passage C (52) of the lower short joint (5), the bottom surface of the inner pipe abuts against the upper end face of the second annular step, so that the central hole passage A (12), the central hole passage B (30) and the central hole passage C (52) form a communicated first liquid passing channel, and the eccentric hole passage A (11), the annular hole passage A (20) and the eccentric hole passage B (51) form a communicated second liquid passing channel.
2. The double-wall drill rod according to claim 1, characterized in that the upper short joint (1) is composed of an outer short joint (16) and an inner short joint (15) arranged in a central hole of the outer short joint (16); wherein,
the inner wall of the top end of the outer short joint (16) is provided with an internal thread used for connecting the bottom end of the lower short joint (5), and the outer wall of the bottom end is provided with an external thread used for connecting the top end of the outer pipe (2); a central pore passage A (12) and an eccentric pore passage A (11) are respectively arranged on the inner short joint (15) along the axial direction;
the inner short circuit (15) and the outer short circuit (16) are integrally processed and formed; or the inner short circuit (15) and the outer short circuit (16) are welded and fixed together or fixed together through fastening screws; or an annular flange is arranged on the outer wall of the top end of the inner short circuit (15), and a thrust step (17) is correspondingly arranged on the inner wall of the outer short circuit (16) below the inner thread, so that the inner short circuit (15) is mounted on the thrust step (17) of the outer short circuit (16) through the annular flange.
3. Double-walled drill rod according to claim 1 or 2, characterized in that a seal a (13) is provided between the outer wall of the inner tube (2) and the wall of the central bore a (12), and a seal B (53) is provided between the outer wall of the inner tube (2) and the wall of the central bore C (52).
4. The double-walled drill rod according to claim 1 or 2, characterized in that an annular shoulder is provided above the external thread of the lower sub (5), the shoulder surface C (54) of the annular shoulder is tightly attached to the annular shoulder surface A (14) formed by processing the end surface of the top end of the upper short joint (1) to form shoulder sealing, the annular shoulder is formed below the internal thread of the upper short joint (1), and the shoulder surface B (10) of the annular shoulder is tightly attached with the annular shoulder surface D (50) formed by processing the bottom end surface of the lower short joint (5) to form shoulder sealing, so that after the two double-wall drill rods are connected and fixed in a threaded manner, the first liquid passing channels of the two double-wall drill rods are communicated with each other, the second liquid passing channels of the two double-wall drill rods are communicated with each other, and the communicated first liquid passing channel and the communicated second liquid passing channel are not communicated with each other through shoulder sealing formed between the shoulder surface B (10) and the shoulder surface D (50).
5. The double-wall drill rod according to claim 4, characterized in that an annular groove provided with a sealing member C (60) is formed in the shoulder surface B (10) or the shoulder surface D (50), so that a seal is formed between the shoulder surface B (10) and the shoulder surface D (50) through the sealing member C (60).
6. The double-wall drill rod as claimed in claim 4, characterized in that the shoulder surface B (10) and the shoulder surface D (50) are machined into mutually matched conical surfaces, and an annular groove provided with a sealing member C (60) is formed in the shoulder surface B (10) or the shoulder surface D (50), so that the sealing between the shoulder surface B (10) and the shoulder surface D (50) is formed through the sealing member C (60).
7. The double-walled drill rod according to claim 5 or 6, characterized in that the sealing element C (60) is an O-ring, a rectangular ring or a combined sealing gasket consisting of rubber and metal ring vulcanized in one piece.
8. Double-walled drill rod according to claim 6, characterized in that the angle of the cone angle of shoulder surface B (10) is equal to the angle of the cone angle of shoulder surface D (50), both being 90 °.
9. The double-wall drill rod as claimed in claim 4, characterized in that the shoulder surface B (10) is formed as an inner cylindrical surface which is concave towards the inside, the shoulder surface D (50) is formed as an outer cylindrical surface which is convex towards the outside and cooperates with the inner cylindrical surface, and a U-shaped sealing ring is arranged between the inner cylindrical surface and the outer cylindrical surface, so that the sealing between the shoulder surface B (10) and the shoulder surface D (50) is formed by the U-shaped sealing ring.
10. The double-wall drill rod according to claim 1, characterized in that at least one centralizer (4) is arranged between the inner pipe (2) and the outer pipe (3) to concentrically arrange the inner pipe (2) and the outer pipe (3), and a plurality of liquid passing channels (40) distributed along the circumferential direction are arranged on the outer wall of the centralizer (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811106495.0A CN108894732A (en) | 2018-09-21 | 2018-09-21 | Double-wall drill pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811106495.0A CN108894732A (en) | 2018-09-21 | 2018-09-21 | Double-wall drill pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108894732A true CN108894732A (en) | 2018-11-27 |
Family
ID=64359502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811106495.0A Pending CN108894732A (en) | 2018-09-21 | 2018-09-21 | Double-wall drill pipe |
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| Country | Link |
|---|---|
| CN (1) | CN108894732A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112377103A (en) * | 2020-10-30 | 2021-02-19 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112610761A (en) * | 2020-12-10 | 2021-04-06 | 席赫 | Anti-corrosion oil transportation pipe |
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| CN112377103B (en) * | 2020-10-30 | 2021-12-10 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112610761A (en) * | 2020-12-10 | 2021-04-06 | 席赫 | Anti-corrosion oil transportation pipe |
| CN112610761B (en) * | 2020-12-10 | 2021-08-17 | 席赫 | Anti-corrosion oil transportation pipe |
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