CN112392410A - Flexible electric connection drill column - Google Patents
Flexible electric connection drill column Download PDFInfo
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- CN112392410A CN112392410A CN202011296978.9A CN202011296978A CN112392410A CN 112392410 A CN112392410 A CN 112392410A CN 202011296978 A CN202011296978 A CN 202011296978A CN 112392410 A CN112392410 A CN 112392410A
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- drill
- mandrel
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- 230000005540 biological transmission Effects 0.000 claims abstract description 77
- 230000007246 mechanism Effects 0.000 claims abstract description 65
- 238000005553 drilling Methods 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims 2
- 230000035515 penetration Effects 0.000 claims 1
- 210000002445 nipple Anatomy 0.000 abstract description 11
- 230000000149 penetrating effect Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B17/028—Electrical or electro-magnetic connections
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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
- E21B17/16—Drill collars
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (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)
- Earth Drilling (AREA)
Abstract
The invention discloses a flexible electric connection drill string which is characterized by comprising a plurality of sections of flexible electric connection drill rods connected end to end, wherein each electric connection drill rod at least comprises a plurality of short section units, a lower connector, a lower electric connector, an upper electric connector and an electric circuit; the pup joint unit at least comprises a variable-angle bit pressure torque transmission mechanism, so that the flexible electric connection drill string can stably transmit drilling power under the condition of deflection; a through structure is arranged in the nipple unit and the variable-angle bit pressure torque transmission mechanism contained in the nipple unit; the transmission of the bit pressure and the torque of the directional drilling tool is respectively realized through a bit pressure transmission mechanism and a torque transmission mechanism which are arranged between the drill collar shell and the mandrel and are independent from each other.
Description
Technical Field
The invention relates to the technical field of drilling and oil drilling, in particular to a flexible electric connection drill column.
Background
The combined structure of the drilling tool at the lower part of the rotary drilling equipment is formed by connecting continuous metal drill rods or continuous cylindrical drill collars. The limit build-up rate of about 15 degrees/30 meters can be realized in the rotary drilling process. There is no permeability in short-very short radius wellbores. In the prior art, an articulated drill string design scheme can realize short-extremely short radius drilling, but only can drive a drill bit to rotate, cannot realize electric connection and communication, and cannot provide power and/or communication for a near-bit measuring device.
The technical problem to be solved by the invention is to drive the directional drilling tool to drill or measure the formation parameters at the position close to the drill bit through the short-extremely short radius well section. According to the invention, the flexible electric connection drill columns are spliced in series through the plurality of flexible electric connection drill rods capable of realizing electric connection, so that the length limit of the flexible electric connection drill columns is greatly expanded, and the combination and connection of the flexible electric connection drill columns can be easily realized. The independent flexible electric connection drill rod can be easily disassembled, so that the transportation is greatly facilitated.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a flexible electric connection drill string is characterized by comprising a plurality of sections of flexible electric connection drill rods which are connected end to end, wherein each electric connection drill rod at least comprises a plurality of short section units, a lower joint, a lower electric connection piece, an upper joint, an upper electric connection piece and an electric circuit; the pup joint unit at least comprises a variable-angle bit pressure torque transmission mechanism which is used for transmitting drilling power in a deflecting mode; a through structure is arranged in the nipple unit and the variable-angle bit pressure torque transmission mechanism contained in the nipple unit;
the electrical circuit penetrates through each short section unit contained in the flexible electric connection drill rod and the variable-angle bit pressure torque transmission mechanism in the short section, and is electrically connected with the lower electric connection piece and the upper electric connection piece and used for realizing electric connection in the flexible electric connection drill rod;
in the flexible electric connection drill column, the lower joint of the previous flexible electric connection drill rod is fixedly connected with the upper joint of the next flexible electric connection drill rod; the lower electric connecting piece of the previous flexible electric connection drill rod is electrically connected with the upper electric connecting piece of the next flexible electric connection drill rod, and the lower electric connecting piece is used for signal transmission between the flexible electric connection drill rods.
It should be noted that the pup joint unit refers to a functional pup joint capable of achieving variable-angle bit pressure torque transmission, and any pup joint unit on the flexible electric connection drill rod can be achieved. The short section units can be connected in any fixed connection mode such as threaded connection and welding. The individual nipple units can also be connected by means of parts of a common end, i.e. the lower parts of the upper nipple units and the upper parts of the lower nipple units are integrally machined. The variable-angle bit pressure torque transmission mechanism can be a cross shaft universal joint, and has the advantages that the cross shaft universal joint can not only transmit torque force, but also transmit axial force. The variable-angle drilling pressure torque transmission mechanism can also be a three-shaft universal joint, a ball-fork universal joint and a rzeppa universal joint. In addition, the electric line comprises a power transmission line and/or a communication line.
Further, as a preferred option, the variable angle weight-on-bit torque transmission mechanism comprises a torque transmission ball cage and a hinge structure, wherein the hinge structure is used for transmitting weight-on-bit or pulling force, and the torque transmission ball cage is used for transmitting torque.
Further, preferably, the pup joint unit comprises a drill collar shell and a mandrel, and the variable-angle bit-weight torque transmission mechanism is arranged between the drill collar shell and the mandrel and used for connecting the drill collar shell and the mandrel to realize torque transmission and/or axial force transmission between the drill collar shell and the mandrel; the mandrel reaches torque transmission mechanism passes through the weight of drilling transfer mechanism endotheca and seat joint inside the drill collar shell, the mandrel is kept away from the one end of torque transmission mechanism stretches out the drill collar shell and with the drill collar shell fixed connection of adjacent drilling unit, torque transmission mechanism includes the rzeppa universal joint, the rzeppa universal joint with the weight of drilling transfer mechanism mutually supports the drive the axis of mandrel is relative the axis of drill collar shell produces deflection angle. It should be noted that the mandrel of the pup joint unit and the drill collar housing adjacent to the pup joint unit can be integrally machined. The short joint units only describe the functions and functions of the short joint units, and all the short joint units can be fixedly connected in any mode.
And further, the pup joint unit comprises a drill collar shell and a mandrel, and the mandrel of the pup joint unit and the drill collar shell of the pup joint unit positioned above the pup joint unit are used as an integral part and processed in an integrated processing mode. The mandrel extends downwards from the lower end of the drill collar shell of the pup joint unit above the mandrel, is inserted into the drill collar shell of the pup joint unit and forms an independent annular space with the drill collar shell of the pup joint unit. The variable-angle bit pressure torque transmission mechanism is arranged in an annular space between the drill collar shell and the mandrel. The mandrel and the torque transmission mechanism are connected to the interior of the drill collar shell through the bit pressure transmission mechanism. The drill collar shell of the previous pup joint unit and the mandrel of the next pup joint unit are used as an integral part to process, so that the length of the pup joint unit can be shortened to the maximum extent. The design mode adopted by the invention avoids realizing connection through screw thread connection, welding, bolting, splicing and the like, can ensure that the overall strength of the flexible electric connection drill rod is better ensured, shortens the length of each short section unit to the maximum extent, and passes through a borehole with higher curvature under the condition that the deflection angles of the short section units are similar.
Further, preferably, the weight on bit transfer mechanism includes at least a first pair of slip surfaces and a second pair of slip surfaces for bearing axial tension and/or pressure, the relative slip surfaces of the first pair of slip surfaces and the second pair of slip surfaces are mutually fitted and can slip in a staggered manner, and the centroids of the first pair of slip surfaces and the second pair of slip surfaces coincide with the center of the birfield universal joint, so that the weight on bit can be transferred to the drill collar housing through the mandrel over the birfield universal joint.
Further, preferably, the ball-type joint is a ball-type constant velocity joint, and a distance from a center of a steel ball to a center of the ball-type constant velocity joint is smaller than distances from the first pair of slip planes and the second pair of slip planes to the center of the ball-type constant velocity joint.
Preferably, through holes are formed in the axial direction of the drilling pressure transmission mechanism, the torque transmission mechanism and the mandrel, and the through holes form a main flow passage for circulation of drilling circulation media.
Further, preferably, an electric circuit accommodating hole or groove is formed in the mandrel; the flexible bridging bridge is arranged at the position where gaps exist among the through holes of the drilling pressure transmission mechanism, the torque transmission mechanism and the mandrel, the flexible bridging bridge is arranged in the electric circuit containing hole or groove, and two ends of the flexible bridging bridge are respectively and fixedly connected to the adjacent electric circuit containing holes or grooves of the drilling pressure transmission mechanism, the torque transmission mechanism and the mandrel.
Further, as a preferred option, a through pipe is arranged inside the flexible electric connection drill rod, the pipe is used for fixing an electric circuit, the electric circuit is fixedly arranged inside or outside the through pipe, one end of the through pipe extends to the uppermost short section unit of the flexible electric connection drill rod at the through pipe, and the other end of the through pipe extends to the lowermost short section unit of the flexible electric connection drill rod at the through pipe, so as to realize the electric circuit and the upper electric connection piece and the lower electric connection piece of the flexible electric connection drill rod at the electric circuit.
Further, preferably, a penetrating pipe is provided inside a penetrating structure included in the nipple unit, and forms a flow passage with the penetrating structure;
when the electric circuit is arranged in the through pipe, an annular space formed by the through pipe and the through structure forms a flow channel of a drilling circulation medium, and when the electric circuit is arranged in the annular space formed by the through pipe and the through structure, the inner space of the through pipe is used for forming the flow channel.
Further, preferably, the upper electrical connector includes at least an upper electrical connection conductive portion and an upper electrical connection insulating portion, and the lower electrical connector includes at least a lower electrical connection conductive portion and a lower electrical connection insulating portion; the upper electric connection conductive part of the upper electric connection piece of the flexible electric connection drill rod positioned below and the lower electric connection conductive part of the lower electric connection piece of the flexible electric connection drill rod positioned above are mutually abutted for transmitting signals and/or electric power; the upper electric connection insulating part of the upper electric connection piece of the flexible electric connection drill rod positioned below and the upper electric connection insulating part of the lower electric connection piece of the flexible electric connection drill rod positioned above are mutually abutted or preset with a small gap for preventing the electric leakage of the conductive part or reducing the electric leakage of the conductive part;
and any one or two of the upper electric connecting piece and the lower electric connecting piece at least comprise a sealing ring, and the sealing ring is arranged in an insertion gap between the upper electric connecting piece of the flexible electric connecting drill rod positioned below and the lower electric connecting piece of the flexible electric connecting drill rod positioned above and is used for preventing a drilling circulating medium from penetrating through the insulating part to cause electric leakage of the conductive part, entering dirt or sealing pressure. The sealing ring is arranged on one side of the insertion gap of the upper electric connecting piece and the lower electric connecting piece, which is close to the drilling circulation medium, namely on a path of the drilling circulation medium flowing through the insertion gap of the upper electric connecting piece and the lower electric connecting piece and contacting with the conductive part.
Furthermore, a limiting structure is arranged on the outer side of the mandrel, the limiting structure is arranged in the drill collar shell of the pup joint unit and is inserted into the drill collar shell of the pup joint unit together with the mandrel, the outer diameter of the limiting structure is smaller than the inner diameter of the drill collar shell, so that a certain moving space can be formed in the next pup joint unit of the mandrel, sliding of a sliding surface and/or movement of a universal joint are facilitated, and the function of variable-angle transmission of bit pressure and torque transmission of the pup joint unit can be realized.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the transmission of the bit pressure and the torque of the directional drilling tool is respectively realized through the bit pressure transmission mechanism and the torque transmission mechanism which are arranged between the drill collar shell and the mandrel and are independent from each other, the drill collar shell and the mandrel are protected from being eroded and damaged by a drilling circulating medium through the pressure-bearing sealing pipe, and meanwhile, the coaxial characteristic of adjacent driving drill rods can be kept to a certain extent, so that the difficulty of well deviation control in the rotary drilling process is reduced while the rotary directional drilling with high deviation rate is realized, and the reliability and the deviation stability of equipment are increased.
Drawings
FIG. 1 is a schematic view of a flexible electrical connection drill string;
FIG. 2 is a schematic view of a flexible electrical connection drill string;
FIG. 3 is a schematic view of a flexible electrical connection drill string;
FIG. 4 is a schematic view of a flexible electrical connection drill string;
FIG. 5 is a detailed view of a portion of a flexible electrical connection drill string;
FIG. 6 is a detailed view of a portion of a flexible electrical connection drill string;
FIG. 7 is a detailed view of a portion of a flexible electrical connection drill string;
in the figure: 1-a nipple unit; 2-lower joint; 3-lower electrical connection; 4-upper joint; 5-power-on connection; 6-electrical lines; 7-variable angle bit pressure torque transmission mechanism; 8-torque transmission ball cage; 9-a hinge structure; 10-drill collar housing; 11-a mandrel; 12-a first pair of glide planes; 13-a second pair of slip planes; 14-a receiving groove; 15-a flexible bridge; 16-a through pipe; 22-a limit structure; 51-electrically connecting the conductive portions; 52-electrical connection insulation; 31-lower electrically connecting conductive portions; 32-lower electrical connection insulation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment: the invention provides a technical scheme that: a flexible electric connection drill string is characterized by comprising a plurality of sections of flexible electric connection drill rods which are connected end to end, wherein each electric connection drill rod at least comprises a plurality of short section units 1, a lower connector 2, a lower electric connection piece 3, an upper connector 4, an upper electric connection piece 5 and an electric circuit 6; the pup joint unit 1 at least comprises a variable-angle bit pressure torque transmission mechanism 7 which is used for transmitting drilling power in a deflecting mode; a through structure is arranged in the nipple unit 1 and the variable-angle bit pressure torque transmission mechanism 7 contained in the nipple unit; the electric circuit 6 penetrates through each short section unit 1 contained in the flexible electric connection drill rod and the variable-angle bit pressure torque transmission mechanism 7 in the short section, and the electric circuit 6 is electrically connected with the lower electric connecting piece 3 and the upper electric connecting piece 5 and used for realizing electric connection in the flexible electric connection drill rod; the lower joint 2 of the lower flexible electric connection drill rod is fixedly connected with the upper joint 4 of the upper flexible electric connection drill rod; inside the flexible electric connection drill string, the lower electric connector 3 of the previous flexible electric connection drill rod is electrically connected with the upper electric connector 5 of the next flexible electric connection drill rod for signal transmission between the flexible electric connection drill rods; the drilling power is transmitted by adapting to the high curvature of the short-extremely short radius well section; the length of the flexible electrical connection drill string needs to be greater than the length of the short-very short radius well section to provide rotary drilling power to the drill bit within the short-very short radius and to provide electrical and/or communication connections to near bit electronics.
The variable-angle weight-on-bit torque transmission mechanism 7 comprises a torque transmission ball cage 8 and a hinge structure 9, wherein the hinge structure is used for transmitting weight-on-bit or pulling force, and the torque transmission ball cage 8 is used for transmitting torque and is used for separately transmitting the weight-on-bit and the torque which are required to be transmitted by the flexible electric connection drill string.
The pup joint unit 1 comprises a drill collar shell 10 and a mandrel 11, and the variable-angle bit-pressure torque transmission mechanism 7 is arranged between the drill collar shell 10 and the mandrel 11 and used for connecting the drill collar shell 10 and the mandrel 11; the mandrel 11 and the torque transmission mechanism 7 are sleeved in the drill collar shell 10 in a sitting mode through the drill pressure transmission mechanism, one end, far away from the torque transmission mechanism 7, of the mandrel 11 extends out of the drill collar shell 10 and is fixedly connected with the drill collar shell 10 of an adjacent drilling unit, the torque transmission mechanism 7 comprises a ball cage type universal joint, and the ball cage type universal joint and the drill pressure transmission mechanism are matched with each other to drive the axis of the mandrel 11 to generate a deflection angle (not exceeding 8 degrees) relative to the axis of the drill collar shell 10 (namely the limit deflection angles at two ends of the ball cage type universal joint are not exceeding 8 degrees, namely the maximum deflection angle generated by the axis of the mandrel relative to the axis of the drill collar shell is not exceeding 8 degrees).
The weight-on-bit transmission mechanism at least comprises a first pair of sliding surfaces 1212 and a second pair of sliding surfaces 13 for bearing axial tension and/or compression force, the opposite sliding surfaces of the first pair of sliding surfaces 12 and the second pair of sliding surfaces 13 are mutually jointed and can slide in a staggered way, and the centroids of the first pair of slip planes 12 and the second pair of slip planes 13 coincide with the center of the rzeppa joint, so that the bit pressure can pass through the ball cage type universal joint through the mandrel 11 and is transmitted to the drill collar shell 10, the sliding surface is used for bearing the axial force including the bit pressure and the pulling force in the flexible electric connection drill string, the steel ball of the universal joint can not bear the bit pressure as far as possible, the service life of the steel ball of the universal joint is greatly prolonged, the torque fluctuation is reduced, and the damage of drill string vibration and resonance to the front end of the flexible electric connection drill string or a near-bit electric device connected in series at any position in the flexible electric connection drill string is avoided.
The ball-type universal joint is a ball-type constant velocity universal joint, and the distance from the center of a steel ball to the center of the ball-type constant velocity universal joint is smaller than the distance from the first pair of sliding surfaces 12 and the second pair of sliding surfaces 13 to the center of the ball-type constant velocity universal joint.
Through holes are formed along the axial direction of the drilling pressure transmission mechanism, the torque transmission mechanism 7 and the mandrel 11, and the through holes form a main flow passage for circulating drilling media to flow.
A flexible electrical connection drill rod as shown in figures 3 and 6, said mandrel being internally provided with an electrical circuit receiving hole or slot 14; and a flexible bridging bridge 15 is arranged at a position where a gap exists between the through holes of the drilling pressure transmission mechanism, the torque transmission mechanism 7 and the mandrel 11, the flexible bridging bridge 15 is arranged in the accommodating hole or the groove of the electric circuit 6, and two ends of the flexible bridging bridge 15 are respectively and fixedly connected to the accommodating holes or the grooves of the adjacent electric circuits 6 of the drilling pressure transmission mechanism, the torque transmission mechanism 7 and the mandrel 11, so that the electric circuit is prevented from being damaged or abraded by the gap, and the electric circuit stably passes through from one side of the gap to the other side of the gap. The bridge includes, but is not limited to, a metal tube with elasticity or flexibility or any other elastic or flexible structure that can accommodate the cable passing gap, and the accommodating hole or groove 14 can be an annular groove, a square groove or a groove with other shapes.
As shown in fig. 4 and 7, a through pipe 16 is arranged inside the flexible electric connection drill rod, the pipe is used for fixing an electric circuit 6, the electric circuit 6 is fixedly arranged inside or outside the through pipe, one end of the through pipe extends to the uppermost short section unit 1 of the flexible electric connection drill rod where the through pipe is located, and the other end of the through pipe extends to the lowermost short section unit 1 of the flexible electric connection drill rod where the through pipe is located, so as to electrically connect the electric circuit 6 with an upper electric connector 5 and a lower electric connector 3 of the flexible electric connection drill rod where the electric circuit is located; the penetrating pipe can be a pipe made of any material, such as a metal pipe, a carbon fiber pipe, a rubber pipe or a composite material pipe.
As shown in fig. 1 and 5, a penetrating pipe 16 is arranged inside a through structure included in the pup joint unit 1 and forms a flow passage with the through structure; when the electric circuit 6 is arranged inside the through pipe, an annular space formed by the through pipe 16 and the through structure forms a flow passage of a drilling circulation medium; a flexible electrical connection drill rod as shown in fig. 4 and 7, the through tube inner space 21 is used to form a flow passage when the electrical line 6 is arranged in the through tube and through structure formed annular space 20.
The upper electrical connector 5 comprises at least an upper electrical connection conductive part 51 and an upper electrical connection insulating part 52, and the lower electrical connector 3 comprises at least a lower electrical connection conductive part 31 and a lower electrical connection insulating part 32; the upper electric connection conductive part of the upper electric connection piece of the flexible electric connection drill rod positioned below and the lower electric connection conductive part of the lower electric connection piece of the flexible electric connection drill rod positioned above are mutually abutted for transmitting signals and/or electric power; the upper electric connection insulating part 52 of the upper electric connection piece 5 of the lower flexible electric connection drill rod and the upper electric connection insulating part 52 of the lower electric connection piece 3 of the upper flexible electric connection drill rod are mutually abutted or are preset with a small gap for preventing electric leakage of a conductive part or slowing down electric leakage of the conductive part; and either one or two of the upper electric connector 5 and the lower electric connector 3 at least comprise a sealing ring, and the sealing ring is arranged in an insertion gap between the upper electric connector 5 of the flexible electric connection drill rod positioned below and the lower electric connector 3 of the flexible electric connection drill rod positioned above and is used for preventing a drilling circulation medium from penetrating through the insulating part to cause electric leakage, dirt entering or sealing pressure of the conductive part.
In specific implementation, a plurality of sections of flexible electric connection drill rods are connected end to form a flexible electric connection drill string, the transmission of the bit pressure and the torque of a directional drilling tool is realized through a bit pressure transmission mechanism and a torque transmission mechanism which are arranged between a drill collar shell and the mandrel and are independent from each other, and the drill collar shell and the mandrel are protected from being corroded and damaged by a drilling circulation medium through a pressure-bearing sealing pipe.
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 variations may 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, and that the terms "above", "below", "output", "input" or other expressions of positional relationship are merely intended to better describe the relative positional relationship of various structures in the invention and do not represent that any component of the invention is positioned above or below absolute positions during drilling.
Claims (13)
1. A flexible electric connection drill string is characterized by comprising a plurality of sections of flexible electric connection drill rods which are connected end to end, wherein each flexible electric connection drill rod at least comprises a plurality of short section units (1), a lower joint (2), a lower electric connection piece (3), an upper joint (4), an upper electric connection piece (5) and an electric circuit (6); the pup joint unit (1) at least comprises a variable-angle weight-on-bit torque transmission mechanism (7) for enabling the flexible electric connection drill string to stably transmit drilling power under a deflection condition; a through structure is arranged inside the short section unit (1);
the electric circuit (6) penetrates through each short section unit (1) contained in the flexible electric connection drill rod and the variable-angle bit pressure torque transmission mechanism (7) in the short section, and the electric circuit (6) is electrically connected with the lower electric connection piece (3) and the upper electric connection piece (5) and used for realizing the electric connection in the flexible electric connection drill rod; the lower joint (2) of the previous flexible electric connection drill rod is fixedly connected with the upper joint (4) of the next flexible electric connection drill rod;
the lower electric connector (3) of the previous flexible electric connection drill rod is electrically connected with the upper electric connector (5) of the next flexible electric connection drill rod, and the lower electric connector and the upper electric connector are used for transmitting electric energy and/or signals between the flexible electric connection drill rods.
2. A flexible electrical connection drill string as claimed in claim 1, characterized in that the variable angle weight on bit torque transmission mechanism (7) comprises a torque transmission ball cage (8) and an articulation structure (9) for transmitting weight on bit or pulling force, the torque transmission ball cage (8) being for transmitting torque.
3. A flexible electrical connection drill string as claimed in claim 1 or 2, characterized in that the sub unit (1) comprises a collar housing (10) and a mandrel (11), the variable angle weight on bit torque transmission mechanism (7) being provided between the collar housing (10) and the mandrel (11) for connecting the collar housing (10) and the mandrel (11); dabber (11) and torque transmission mechanism (7) pass through weight of drilling transmission mechanism connect in inside drill collar shell (10), dabber (11) are kept away from the one end of torque transmission mechanism (7) is stretched out drill collar shell (10) and with drill collar shell (10) fixed connection of adjacent drilling unit, torque transmission mechanism (7) include the rzeppa universal joint, the rzeppa universal joint with weight of drilling transmission mechanism mutually supports the drive the axis of dabber (11) is relative the axis of drill collar shell (10) produces deflection angle.
4. The flexible electric connection drill pipe as claimed in claim 1 or 2, characterized in that the pup joint unit (1) comprises a drill collar housing (10) and a mandrel (11), the mandrel (11) of the pup joint unit and the drill collar housing (10) of the adjacent pup joint unit are integrally machined parts, and the mandrel extends downwards from the lower end of the drill collar housing of the adjacent pup joint unit (1) and is inserted into the drill collar housing (10) of the pup joint unit (1) to form an independent annular space with the drill collar housing of the pup joint unit (1);
the variable-angle bit pressure torque transmission mechanism (7) is arranged in an annular space between the drill collar shell (10) and the mandrel (11). The mandrel (11) and the torque transmission mechanism (7) are connected to the interior of the drill collar shell (10) through the bit pressure transmission mechanism.
5. A flexible electrical connection drill string according to any one or more of claims 1-4, characterized in that the weight on bit transfer mechanism comprises at least a first pair of slip planes (12) and a second pair of slip planes (13) for taking up axial tensile and/or compressive forces, the opposite slip planes of the first pair of slip planes (12) and the second pair of slip planes (13) are mutually abutting and capable of slip by misalignment, and the centroids of the first pair of slip planes (12) and the second pair of slip planes (13) coincide with the center of the rzeppa joint for enabling weight on bit and/or torque transfer between the mandrel (11) and the collar housing (10).
6. A flexible electrical connection drill string according to any one or more of claims 1-5, wherein the ball joint is a ball constant velocity joint, the distance from the centre of the ball to the centre of the ball constant velocity joint being less than the distance from the first (12) and second (13) pairs of slip planes to the centre of the ball constant velocity joint.
7. Drill string according to any one or several of claims 1-4, characterised in that holes are provided along the axial direction of the weight-on-bit, torque-transferring and mandrel (11), which holes constitute the main flow path for the circulation medium of the drilling circulation.
8. Flexible electrical connection drill string according to any of claims 1-7, characterized in that the mandrel is provided internally with an electrical line receiving hole or slot (14); and a flexible bridging bridge (15) is arranged at a position where a gap exists among the through holes of the drilling pressure transmission mechanism, the torque transmission mechanism (7) and the mandrel (11), the flexible bridging bridge (15) is arranged in the electric line (6) accommodating hole or groove, and two ends of the flexible bridging bridge are respectively and fixedly connected to the drilling pressure transmission mechanism, the torque transmission mechanism (7) and the adjacent electric line (6) accommodating hole or groove of the mandrel (11).
9. A flexible electric connection drill string according to any one of claims 1 to 7, characterized in that a through pipe (16) is arranged inside the flexible electric connection drill rod, the pipe is used for fixing an electric line (6), the electric line (6) is fixedly arranged inside or outside the through pipe, one end of the through pipe extends to the uppermost sub unit (1) of the flexible electric connection drill rod where the through pipe is located, and the other end of the through pipe extends to the lowermost sub unit (1) of the flexible electric connection drill rod where the through pipe is located, so as to electrically connect the electric line (6) with the upper electric connector (5) and the lower electric connector (3) of the flexible electric connection drill rod where the through pipe is located.
10. Drill string according to claim 9, characterised in that a through pipe (16) is arranged inside the through structure comprised by the sub unit (1) and forms a flow channel with the through structure;
when the electrical line (6) is arranged inside the through pipe, an annular space formed by the through pipe (16) and the through structure forms a flow channel of a drilling circulation medium, and when the electrical line (6) is arranged inside an annular space (20) formed by the through pipe and the through structure, an inner space (21) of the through pipe is used for forming the flow channel.
11. Drill string with flexible electrical connection according to any one or several of claims 1, 7, 8 or 9, characterised in that the upper electrical connection (5) comprises at least an upper electrical connection conductor part (51) and an upper electrical connection insulation part (52), and that the lower electrical connection (3) comprises at least a lower electrical connection conductor part (31) and a lower electrical connection insulation part (32); the upper electric connection conductive part of the upper electric connection piece of the flexible electric connection drill rod positioned below and the lower electric connection conductive part of the lower electric connection piece of the flexible electric connection drill rod positioned above are mutually abutted for transmitting signals and/or electric power; an upper electric connection insulating part (52) of the upper electric connection piece (5) of the flexible electric connection drill rod positioned below and an upper electric connection insulating part (52) of the lower electric connection piece (3) of the flexible electric connection drill rod positioned above are mutually abutted or preset with a small gap, so that electric leakage of the conductive part is prevented or slowed down.
12. A drill string according to any one or more of claims 1, 7, 8, 9, 10 or 11, characterised in that the upper electrical connector (5) and/or the lower electrical connector (3) comprise at least one sealing ring, which is/are arranged in the insertion gap between the upper electrical connector (5) of the lower drill string and the lower electrical connector (3) of the upper drill string, for preventing the penetration of the drilling circulation medium through the insulation, which may lead to electrical leakage, dirt ingress or sealing pressure in the conductive part.
13. Drill string according to any one or more of claims 1-12, characterised in that a stop structure (22) is arranged outside the mandrel, inside the collar housing of the pup unit, with an annular gap.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296978.9A CN112392410B (en) | 2020-11-18 | 2020-11-18 | Flexible electric connection drill column |
| PCT/CN2021/110330 WO2022028420A1 (en) | 2020-08-03 | 2021-08-03 | Short-radius directional well drilling tool and method |
| PCT/CN2021/131198 WO2022105791A1 (en) | 2020-11-18 | 2021-11-17 | Flexible electrical connection drill string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296978.9A CN112392410B (en) | 2020-11-18 | 2020-11-18 | Flexible electric connection drill column |
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| Publication Number | Publication Date |
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| CN112392410A true CN112392410A (en) | 2021-02-23 |
| CN112392410B CN112392410B (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011296978.9A Active CN112392410B (en) | 2020-08-03 | 2020-11-18 | Flexible electric connection drill column |
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| CN (1) | CN112392410B (en) |
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| CN115434691A (en) * | 2021-06-02 | 2022-12-06 | 徐梓辰 | Position measuring device and method |
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| CN112392410B (en) | 2023-03-24 |
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