CN111271016A - Reentry cone feeding device for ocean drilling - Google Patents
Reentry cone feeding device for ocean drilling Download PDFInfo
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- CN111271016A CN111271016A CN202010254370.3A CN202010254370A CN111271016A CN 111271016 A CN111271016 A CN 111271016A CN 202010254370 A CN202010254370 A CN 202010254370A CN 111271016 A CN111271016 A CN 111271016A
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- 238000005553 drilling Methods 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims description 167
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 239000011324 bead Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000003801 milling Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 13
- 238000010276 construction Methods 0.000 abstract description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
- E21B33/043—Casing heads; Suspending casings or tubings in well heads specially adapted for underwater well heads
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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
- E21B7/12—Underwater drilling
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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
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of auxiliary devices for ocean engineering construction, in particular to a reentry cone feeding device for ocean drilling, which can be matched with a pipe following drilling process to lower a reentry cone, can realize synchronous drilling and casing pipe lowering, can be automatically unlocked in a ball throwing and pressure holding mode, and can lift a drill rod of an internal drilling tool after the reentry cone is lowered; including hanging the overcoat subassembly, hang the joint, the heart pipe, the multiunit lockpin, hang the screw, the locating pin, steel ball and sealing washer, it includes hangs the overcoat to hang the overcoat subassembly, go up the flange, the lower flange, brace rod and multiunit lockpin seat assembly, lockpin seat assembly is including hanging the seat, the lock is female, a spring, ejector pin and sealing washer, it is cylindrical structure to hang the overcoat, the both ends of excircle are provided with tang and lower tang respectively, go up the flange welding and hang the last tang of overcoat, it is used for the installation to reentrant the awl to go up the flange, the lower tang of hanging the overcoat is welded to the lower flange, the lower flange is used for installing the mud pad.
Description
Technical Field
The invention relates to the technical field of ocean engineering construction auxiliary devices, in particular to a reentry cone feeding device for ocean drilling.
Background
As is well known, in the deep sea drilling construction process without a marine riser, when hard stratum is met, a drill bit is easy to wear and short in service life, in order to achieve a larger drilling depth and meet the requirements of complex well body structures, the drill bit (drilling tool) needs to be frequently replaced, and the problem of drill hole reentry is faced when the drill bit is drilled down after the drill bit is pulled out. In addition, along with the change of the stratum, different types of drill bits also need to be replaced, and similarly, around the engineering requirements of ocean science drilling, sometimes, various testing instruments, observation stations and the like need to be sent into the well by using drilling tools so as to meet the different scientific research purposes, and the same drilling hole reentry requirements are met.
Conventional drilling operations are cased in at least two steps, i.e., a borehole is drilled to a diameter greater than the outside diameter of the casing, and the casing is then run in. In the process of casing running in deep sea drilling, the situations that the casing running is blocked, the casing is not in place and the like due to hole shrinkage and collapse of drill holes can occur, bad results are caused, and construction progress and subsequent engineering implementation are seriously influenced. The casing drilling and casing running process is characterized in that the casing is continuously drilled while the casing is drilled, and when the casing is drilled to a target layer, the casing is seated in a stable stratum. Therefore, the process of casing running is simplified, the casing running operation time is obviously saved, the risk of casing running blockage (casing running failure) is greatly reduced, safe drilling is realized, and the stable propulsion of subsequent construction is ensured. The reentry cone and the casing are lowered in one time by adopting the pipe following drilling process, so that the lowering process is simplified, and the construction risk is reduced.
A large diameter trumpet called a "reentry cone" is provided in the borehole reentry system to guide the drill bit (drill or other instrument, etc.) into the borehole. A sonar transmitter is arranged near the reentrant cone, and the position of the reentrant cone can be determined after signals of the sonar transmitter are received and processed by a receiver on a ship. The drillship is moved according to the measurement results, and the primary positioning of the drill string can be realized. When the drilling is carried out till the drilling is close to the reentry cone, the underwater television is put along the drill string, the position of the ocean bottom reentry cone is observed, and the drilling ship is moved according to the observation result, so that the position fine adjustment of a drill bit (a drilling tool or other instruments and the like) is realized. When the drill bit (drilling tool or other instrument) falls on the inner conical surface of the reentrant cone, the drill bit can slide along the conical surface to drill a hole, and finally the drill hole is drilled.
The reentry system (including the surface casing) needs to be sent to the seabed mud surface by a special device through a drill stem, and when the reentry system is placed, the reentry system is separated from the drill stem by the device for the next operation. This device is called a "reentrant cone running tool". The data show that no reentry cone feeding tool complete product exists in China, the related technology is monopolized by a few foreign companies at present, only related technology service is provided, and related products and technologies are not sold, so that the research on a reentry cone feeding device for marine drilling is urgently needed to solve the problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a reentry cone feeding device for ocean drilling, which can be matched with a following pipe drilling process to lower a reentry cone, can realize synchronous drilling and casing pipe lowering, can automatically unlock in a ball-throwing pressure-holding mode, and can lift a drill rod of an internal drilling tool after the reentry cone is lowered.
The invention relates to a reentrant cone feeding device for offshore drilling, which comprises a suspension outer sleeve component, a suspension joint, a core pipe, a plurality of groups of lock pins, suspension screws, a positioning pin, a steel ball and a sealing ring, wherein the suspension outer sleeve component comprises a suspension outer sleeve, an upper flange, a lower flange, a support rib and a plurality of groups of lock pin seat assemblies, each lock pin seat assembly comprises a suspension seat, a lock nut, a spring, an ejector rod and a sealing ring, the suspension outer sleeve is of a cylindrical structure, two ends of an excircle are respectively provided with an upper spigot and a lower spigot, the upper flange is welded on the upper spigot of the suspension outer sleeve, the upper flange is used for installing a reentrant cone, the lower flange is welded on the lower spigot of the suspension outer sleeve, the lower flange is used for installing a mud pad, the upper part and the lower part of the support rib are respectively welded with the upper flange and the lower flange, one side of the support rib is welded with the suspension outer sleeve, a plurality of, the upper end in the suspension outer sleeve is an inner hexagon, a plurality of groups of lock pin seat assemblies are uniformly arranged in a plurality of round holes formed in the circumference of the suspension outer sleeve, the lock pin seat assemblies are welded with the suspension outer sleeve, the suspension joint is arranged in the suspension outer sleeve, the circumference of the suspension joint is provided with holes with the same number as the lock pin seat assemblies and used for installing lock pins, a plurality of groups of lock pins are respectively arranged in the holes formed in the circumference of the suspension joint, the lock pins are aligned to ball sockets of the lock pin seat assemblies after passing through the suspension joint, the head parts of the lock pins are arranged in the ball sockets and are respectively connected with a drill rod by bearing the weight of a feeding device and a reentrant cone and a mud pad connected with the feeding device, the upper part and the lower part of the suspension joint are respectively connected with the drill rod, the reentrant cone and the mud pad are placed on a seabed mud surface by lowering the, the screw rod part of the suspension screw is arranged in the core tube, the polished rod part is arranged in the lock pin, the polished rod of the lock pin and the polished hole of the suspension screw are in clearance tolerance fit, so that the lock pin is connected with the core tube, the core tube is suspended in the suspension joint, the upper part and the lower part of the lock pin mounting hole of the suspension joint are respectively provided with a sealing groove, and the contact surface of the core tube and the suspension joint is respectively provided with a sealing groove for mounting a sealing ring.
The invention relates to a reentry cone feeding device for offshore drilling,
the hanging seat is in an external stepped cylinder form, the small-diameter end is installed in a hole formed in the circumference of the hanging outer sleeve, the end face of the small-diameter end is in an arc shape, the radian of the end face is equal to the inner diameter of the hanging outer sleeve, one end of the interior of the hanging seat is provided with internal threads and is connected with the lock nut, one end of the interior of the hanging seat is provided with a ball socket, the diameter of the ball socket is the same as that of a spherical surface of the;
the ejector rod is a stepped shaft with a large middle part and small two ends, the ejector rod is placed in the hanging seat, one end of the ejector rod is inserted into the small hole in the hanging seat, the large middle part limits the movement of the ejector rod to prevent the ejector rod from extending out of the hanging seat, and the other end of the ejector rod is used as a guide rod of the spring and is inserted into the spring;
the middle main body part of the lock pin is cylindrical, one end surface is spherical, the spherical surface is matched with a ball socket of the hanging seat, the other end surface is in a cone frustum form, the large end of the cone frustum is close to the middle cylindrical section, the diameter of the large end is larger than that of the middle main body cylinder, the small end of the cone frustum is contacted with the core tube, the cone frustum can prevent the hanging joint from being lifted out of the hanging outer sleeve, the lock pin falls into the hole, the inside of the lock pin is a stepped hole, the large-diameter part is a threaded hole, the middle diameter part and the small-diameter part are unthreaded holes, the suspension screw is screwed into the threaded hole of the core tube from the large-diameter end of the lock pin to connect the core tube with the lock pin, the nut of the suspension screw falls onto the stepped surface of the transition between the middle diameter part and the small diameter part of the lock pin, the stepped surface plays a limiting role for the suspension screw, the threaded hole of the lock pin is used for installing a set screw, the set screw plays a blocking role for the sheared nut section of the suspension screw, and the sheared nut section of the suspension screw can be;
the suspension joint is externally in a stepped shaft form, the suspension joint is internally in a stepped hole form, and the external structure form is as follows from top to bottom: the uppermost end is an outer hexagon which is matched with an inner hexagon of the suspension outer sleeve, the connecting section of the outer hexagon is a large-diameter excircle, 4 radial round holes vertical to the central axis of the suspension joint are uniformly arranged in the middle of the excircle along the circumferential direction, the diameter of the radial round holes is the same as the diameter of the main body part of the lock pin, sealing grooves are respectively arranged above and below the 4 radial round holes, used for installing a sealing ring, the connecting section of the sealing ring and the large-diameter excircle is a small-diameter excircle, the lower end of the small-diameter excircle is a conical male screw thread used for connecting a lower drill rod, the uppermost end inside is a conical female screw thread, the diameter of the inner circle at the position of four radial holes is larger than the diameter of the upper and lower sections of the inner circle, so that when the four lock pins are tightly propped against the ball socket of the hanging seat, the diameter of the position of the hanging joint is ensured to ensure that the lock pins do not interfere in the radial direction;
the external shape of the core tube is in a dry shape, the large diameter at the upper end and the large diameter in the middle are respectively matched with an inner hole of a suspension joint, sealing grooves are respectively processed on the excircle of the two large diameters, a sealing ring is installed for sealing the upper position and the lower position of the core tube and the suspension joint, the suspension screw is cut off after the core tube is subjected to hydraulic pressure, the core tube falls onto the step surface of the suspension joint, the small diameter section between the two large diameters of the core tube is just opposite to the lock pin, when the core tube is suspended by the suspension screw, the core tube plays a role in limiting the lock pin, the lock pin is fixed between the suspension seat and the core tube, the spring in the suspension seat is compressed, when the suspension screw is cut off, the core tube moves downwards, the radial limitation of the lock pin is eliminated by the core tube, the compressed spring bounces the lock pin from a ball socket through an ejector rod, the conical table end of the lock pin enters the small diameter section in the middle of the two, the inverted conical surface is used for placing steel balls, when the suspension screws need to be cut off, the steel balls fall onto the inverted conical surface from top to bottom, the core tube is plugged, and then the suspension screws are cut off by pressing;
the positioning pin is a cylindrical pin, one end of the positioning pin is a plane, the other end of the positioning pin is a conical surface, one end of the plane is in threaded connection with the flange hole of the lower flange, the end of the positioning pin is welded after the positioning pin is installed in place, and the height of a welding bead does not exceed the plane of the lower flange.
The reentry cone feeding device for offshore drilling is characterized in that a plurality of round holes are uniformly formed in the circumference of the middle position of the suspension outer sleeve, and the number of the round holes is more than or equal to 4.
According to the reentrant cone feeding device for offshore drilling, the upper end inside the suspension outer sleeve can be in other regular polygons.
Compared with the prior art, the invention has the beneficial effects that: (1) the feeding device can be matched with a pipe following drilling process to transfer a reentry cone, and can realize synchronous drilling and casing pipe transfer;
(2) the feeding device can be automatically unlocked in a ball-throwing pressure-holding mode, and the lifting of the drill rod of the internal drilling tool after the reentry cone is lowered is completed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a latch boss assembly;
FIG. 3 is an enlarged view of a portion A of FIG. 1;
in the drawings, the reference numbers: 2-1, hanging the outer sleeve component; 2-1-1, hanging an outer sleeve; 2-1-2, an upper flange; 2-1-3, lower flange; 2-1-4, support ribs; 2-1-5, a lock pin seat assembly; 2-1-5-1, hanging seat; 2-1-5-2, lock nut; 2-1-5-3, spring; 2-1-5-4, a top rod; 2-2, hanging the joint; 2-3, a core tube; 2-4, a lock pin; 2-5, hanging screws; 2-6, positioning pins; 2-7, steel balls.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in figures 1 to 3, the reentry cone feeding device for offshore drilling comprises a suspension outer sleeve assembly 2-1, a suspension joint 2-2, a core pipe 2-3, a plurality of groups of lock pins 2-4, suspension screws 2-5, positioning pins 2-6, steel balls 2-7 and sealing rings, wherein the suspension outer sleeve assembly 2-1 comprises a suspension outer sleeve 2-1-1, an upper flange 2-1-2, a lower flange 2-1-3, support ribs 2-1-4 and a plurality of groups of lock pin seat assemblies 2-1-5, the lock pin 2-4 seat assemblies 2-1-5 comprise a suspension seat 2-1-5-1, a lock nut 2-1-5-2, a spring 2-1-5-3, a push rod 2-1-5-4 and a sealing ring, the suspension outer sleeve 2-1-1 is of a cylindrical structure, an upper spigot and a lower spigot are respectively arranged at two ends of an outer circle, an upper flange 2-1-2 is welded at the upper spigot of the suspension outer sleeve 2-1-1, the upper flange 2-1-2 is used for installing a reentrant cone, a lower flange 2-1-3 is welded at the lower spigot of the suspension outer sleeve 2-1-1, a lower flange 2-1-3 is used for installing a mud pad, the upper part and the lower part of a support rib 2-1-4 are respectively welded with the upper flange 2-1-2 and the lower flange 2-1-3, one side of the support rib 2-1-4 is welded with the suspension outer sleeve 2-1-1, a plurality of round holes are uniformly formed in the circumference of the middle position of the suspension outer sleeve 2-1-1, and the combination parts of the round holes and the outer cylindrical surface of the suspension, the upper end of the interior of the suspension outer sleeve 2-1-1 is provided with an inner hexagon, a plurality of groups of lock pin seat assemblies 2-1-5 are uniformly arranged in a plurality of round holes arranged on the circumference of the suspension outer sleeve 2-1-1 in a circumferential manner, lock pins 2-4 seat assemblies 2-1-5 are welded with the suspension outer sleeve 2-1-1, a suspension joint 2-2 is arranged in the suspension outer sleeve 2-1-1, holes with the same number as the lock pins 2-4 seat assemblies 2-1-5 are arranged on the circumference of the suspension joint 2-2 and used for installing the lock pins 2-4, a plurality of groups of lock pins 2-4 are respectively arranged in the holes arranged on the circumference of the suspension joint 2-2, the lock pins 2-4 are aligned with ball sockets of the lock pins 2-4 seat assemblies 2-1-5 after passing through the, the heads of the lockpins 2-4 are arranged in the ball sockets and are used for bearing the weight of a feeding device and a reentry cone and a mud pad connected with the feeding device, the upper part and the lower part of a suspension joint 2-2 are respectively connected with a drill rod, the reentry cone and the mud pad are placed on the mud surface of the sea bottom by lowering the drill rod, a core tube 2-3 is arranged in the suspension joint 2-2, the core tube 2-3 is connected with the lockpins 2-4 through suspension screws 2-5, the suspension screws 2-5 are screwed into threaded holes of the core tube 2-3 from unthreaded holes at the ends of the lockpins 2-4, screw rods of the suspension screws 2-5 are arranged in the core tube 2-3, the smooth rods are arranged in the lockpins 2-4, the smooth rods of the lockpins 2-4 and the unthreaded holes of the suspension screws 2-5 are in clearance tolerance fit, so that the lock, the core pipe 2-3 is hung in the suspension joint 2-2, sealing grooves are respectively formed in the upper part and the lower part of a mounting hole of a lock pin 2-4 of the suspension joint 2-2, and sealing grooves are respectively formed in the upper part and the lower part of the contact surface of the core pipe 2-3 and the suspension joint 2-2 and used for mounting a sealing ring; the feeding device is divided into two parts, one part is a fixed part, the other part is a movable part, the fixed part is a suspension outer sleeve component which is respectively connected and fixed with a reentrant cone and a mud pad, the movable part is a suspension joint, a core tube, a lock pin and a suspension screw, the lowering and unlocking of the whole device are completed through the matching of the movable part and the suspension outer sleeve component, the lock pin is connected with the core tube through the suspension screw, the core tube pushes the lock pin into a ball socket, so that the lock pin is connected with the suspension outer sleeve component and the suspension joint, the vertical cross section area of the core tube is the same, the vertical stress of the core tube is balanced in the feeding process of the reentrant cone, the lock pin always pushes the lock pin into the ball socket of the suspension seat, the lock pin connects the suspension joint and the suspension outer sleeve into a whole, a drill rod is connected with the suspension joint, the reentrant cone and the mud pad are together lowered to the mud surface, after, and continuously injecting pressure to the inside, shearing the suspension screw under the action of the upper pressure on the core tube, moving the core tube downwards, pushing the lock pin out of the ball socket by the compressed spring to push the ejector rod, separating the suspension joint from the suspension outer sleeve component, lifting the drill rod, and lifting the drilling tool, the drill rod, the suspension joint, the core tube and the lock pin out of the hole to complete feeding of the reentrant cone.
The invention relates to a reentrant cone feeding device for offshore drilling, wherein a hanging seat 2-1-5-1 is in an external stepped cylinder form, a small-diameter end is arranged in a hole formed in the circumference of a hanging outer sleeve 2-1-1, the end surface of the small-diameter end is in an arc shape, the radian is equal to the inner diameter of the hanging outer sleeve 2-1-1, one end inside the hanging seat 2-1-5-1 is provided with internal threads and is connected with a lock nut 2-1-5-2, one end of the internal hanging seat is provided with a ball socket, the diameter of the internal hanging seat is the same as that of a spherical surface of a lock pin 2-4, the middle part of the internal hanging seat is provided with a;
the ejector rod 2-1-5-4 is a stepped shaft with a large middle part and small two ends, the ejector rod 2-1-5-4 is placed inside the hanging seat 2-1-5-1, one end of the ejector rod is inserted into a small hole inside the hanging seat 2-1-5-1, the middle large end limits the movement of the ejector rod 2-1-5-4 to prevent the ejector rod 2-1-5-4 from extending out of the hanging seat 2-1-5-1, and the other end of the ejector rod is used as a guide rod of the spring 2-1-5-3 and is inserted into the spring 2-1-5-3;
the middle main body part of the lock pin 2-4 is cylindrical, one end surface is spherical, the spherical surface is matched with a ball socket of the hanging seat 2-1-5-1, the other end surface is in the form of a cone frustum, the large end of the cone frustum is close to the middle cylindrical section, the diameter is larger than that of the middle main body cylinder, the small end is contacted with the core tube 2-3, the cone frustum can prevent the hanging joint 2-2 from falling out of the hanging outer sleeve 2-1, the lock pin 2-4 falls into a hole, a step hole is arranged inside the lock pin 2-4, the large diameter part is a threaded hole, the middle diameter part and the small diameter part are light holes, a hanging screw 2-5 is screwed into the threaded hole of the core tube 2-3 from the large diameter end of the lock pin 2-4 to connect the core tube 2-3 with the lock pin 2-4, and the nut of the hanging screw 2-5, the step surface plays a limiting role on the suspension screws 2-5, the threaded holes of the lock pins 2-4 are used for installing the set screws, and the set screws play a blocking role on the sheared nut sections of the suspension screws 2-5, so that the sheared nut sections of the suspension screws 2-5 can be prevented from falling out of the lock pins 2-4;
the outer part of the suspension joint 2-2 is in a stepped shaft form, the inner part of the suspension joint is in a stepped hole form, and the outer structural form is as follows from top to bottom: the uppermost end is an outer hexagon which is matched with an inner hexagon of the suspension outer sleeve 2-1-1, a connecting section with the outer hexagon is a large-diameter excircle, the middle position of the excircle is uniformly provided with 4 radial round holes which are vertical to the central axis of the suspension joint 2-2 along the circumferential direction, the diameter of each radial round hole is the same as that of the main body part of the lock pin 2-4, sealing grooves are respectively arranged above and below the 4 radial round holes for installing sealing rings, the connecting section with the large-diameter excircle is a small-diameter excircle, the lower end of the small-diameter excircle is a conical male screw thread for connecting a lower drill rod, the uppermost end inside the connecting section is a conical female screw thread for connecting an upper drill rod, the lower end of the conical female screw thread is a round hole with gradually reduced diameter, the diameter of the round hole at the minimum position is more than or equal to the outer diameter of the tube body at the, when the four lock pins 2-4 are tightly propped against the ball sockets of the hanging seats 2-1-5-1, the apertures of the hanging joints 2-2 ensure that the lock pins 2-4 are not interfered in the radial direction;
the outer shape of the core tube 2-3 is in a 'dry' shape, the large diameter of the upper end and the large diameter of the middle are respectively matched with an inner hole of the suspension joint 2-2, the outer circles with the large diameters of the two diameters are respectively provided with a sealing groove, a sealing ring is arranged for sealing the upper position and the lower position of the core tube 2-3 and the suspension joint 2-2, the core tube 2-3 is sheared by a suspension screw 2-5 after being subjected to hydraulic pressure, the core tube 2-3 falls onto the step surface of the suspension joint 2-2, the small diameter section between the two large diameters of the core tube 2-3 is just opposite to the lock pin 2-4, when the core tube 2-3 is suspended by the suspension screw 2-5, the core tube 2-3 plays a role in limiting the lock pin 2-4, and the lock pin 2-4 is fixed between the suspension seat 2-1-5-1 and the core tube 2-3, the spring 2-1-5-3 in the hanging seat 2-1-5-1 is compressed, when the central tube 2-3 moves downwards after the suspension screw 2-5 is sheared off, the radial limitation of the central tube 2-3 to the lock pin 2-4 is eliminated, therefore, the compressed spring 2-1-5-3 bounces the lock pin 2-4 away from the ball socket through the ejector rod 2-1-5-4, the cone table end of the lock pin 2-4 enters the small-diameter section in the middle of the two large diameters of the core tube 2-3, the interior of the core tube 2-3 is a through hole, the upper end of the core tube is provided with a large inverted cone, the inverted cone is used for placing the steel ball 2-7, the steel ball 2-7 is placed from top to bottom when the suspension screw 2-5 needs to be cut off, the steel ball 2-7 falls onto the inverted cone, the core tube 2-3 is sealed, and then the compression is carried out to cut off the suspension;
the positioning pin 2-6 is a cylindrical pin, one end of the positioning pin is a plane, the other end of the positioning pin is a conical surface, one end of the plane is connected to the flange hole of the lower flange 2-1-4 in a threaded mode, the end portion of the positioning pin 2-6 is welded after the positioning pin 2-6 is installed in place, and the height of a welding bead does not exceed the plane of the lower flange 2-1-4.
The invention relates to a reentrant cone feeding device for offshore drilling, wherein a plurality of round holes are uniformly formed in the circumference of the middle position of a suspension outer sleeve 2-1-1, and the number of the round holes is more than or equal to 4.
The reentry cone feeding device for offshore drilling can be characterized in that the upper end inside the suspension outer sleeve 2-1-1 can be in other regular polygons; for preventing relative rotation of the suspension jacket and the suspension joint.
The invention relates to a reentry cone feeding device for offshore drilling, which is characterized in that when in work, the feeding device is divided into two parts, one part is a fixed part, the other part is a movable part, the fixed part is a suspension outer sleeve component and is respectively connected and fixed with a reentry cone and a mud pad, the movable part is a suspension joint, a core pipe, a lock pin and a suspension screw, the lowering and unlocking of the whole device are completed through the matching with the suspension outer sleeve component, the lock pin is connected with the core pipe through the suspension screw, the core pipe jacks the lock pin into a ball socket, so that the lock pin is connected with the suspension outer sleeve component and the suspension joint, the upper and lower cross-sectional areas of the core pipe are the same, the upper and lower stress of the core pipe is balanced during the feeding process of the reentry cone, the lock pin always jacks into the ball socket of the suspension seat, the lock pin connects the suspension joint and the suspension outer sleeve into a whole, a drill rod, and (3) putting a steel ball into the centripetal pipe, dropping the steel ball onto the conical surface of the core pipe, plugging the internal channel of the core pipe, continuously injecting pressure to the inside, shearing the suspension screw under the action of upper pressure on the core pipe, moving the core pipe downwards, pushing the lock pin out of the ball socket by the compressed spring to push the push rod, separating the suspension joint from the suspension outer sleeve component, lifting the drill rod, and lifting the drilling tool, the drill rod, the suspension joint, the core pipe and the lock pin out of the hole to finish feeding of the reentrant cone.
The reentry cone feeding device for ocean drilling comprises a plurality of parts, wherein the parts are welded, riveted or arranged in a sliding/rotating mode, the parts are fixed in a sliding/rotating mode, namely, the parts do not fall off in the sliding/rotating state, the parts are communicated in a sealing mode, namely, the two connecting pieces are communicated and simultaneously sealed, the specific structures, the models and the coefficient indexes of the parts are self-contained technologies, the parts can be implemented as long as the beneficial effects of the parts are achieved, all the electric modules and the electric appliances are common electric appliances in the market, the parts can be used only by being electrically connected with each other according to the purchased instructions when bought back for use, and the control module is a common self-contained module, so the details are omitted.
The invention relates to a reentrant cone feeding device for offshore drilling, in which, without being stated otherwise, the directional words included in the terms "upper, lower, left and right, front, rear, inner and outer, and vertical and horizontal" are only used to represent the orientation of the term in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A reentry cone feeding device for marine drilling is characterized by comprising a suspension outer sleeve assembly (2-1), a suspension joint (2-2), a core pipe (2-3), a plurality of groups of lock pins (2-4), suspension screws (2-5), positioning pins (2-6), steel balls (2-7) and sealing rings, wherein the suspension outer sleeve assembly (2-1) comprises a suspension outer sleeve (2-1-1), an upper flange (2-1-2), a lower flange (2-1-3), support ribs (2-1-4) and a plurality of groups of lock pin seat assemblies (2-1-5), and the lock pin (2-4) seat assemblies (2-1-5) comprise suspension seats (2-1-5-1), lock nuts (2-1-5-2), A spring (2-1-5-3), a push rod (2-1-5-4) and a sealing ring, wherein the suspension outer sleeve (2-1-1) is of a cylindrical structure, the two ends of the excircle are respectively provided with an upper spigot and a lower spigot, the upper flange (2-1-2) is welded on the upper spigot of the suspension outer sleeve (2-1-1), the upper flange (2-1-2) is used for installing a reentrant cone, the lower flange (2-1-3) is welded on the lower spigot of the suspension outer sleeve (2-1-1), the lower flange (2-1-3) is used for installing a mud pad, the upper part and the lower part of the support rib (2-1-4) are respectively welded with the upper flange (2-1-2) and the lower flange (2-1-3), one side of the support rib (2-1-4) is welded with the suspension outer sleeve (2-1-1), a plurality of round holes are uniformly formed in the circumference of the middle position of the suspension outer sleeve (2-1-1), the milling plane is formed at the position where the round holes are combined with the outer cylindrical surface of the suspension outer sleeve (2-1-1), the inner upper end of the suspension outer sleeve (2-1-1) is provided with an inner hexagon, a plurality of groups of lock pin seat assemblies (2-1-5) are uniformly arranged in the plurality of round holes formed in the circumference of the suspension outer sleeve (2-1-1), the lock pin (2-4) seat assemblies (2-1-5) are welded with the suspension outer sleeve (2-1-1), the suspension joints (2-2) are arranged in the suspension outer sleeve (2-1-1), the number of holes which is the same as that of the lock pin (2-4) seat assemblies (2-1-5) are formed in the circumference of the suspension joints (2-, the locking device is used for installing locking pins (2-4), a plurality of groups of locking pins (2-4) are respectively installed in holes formed in the circumference of a suspension joint (2-2), the locking pins (2-4) are aligned with ball sockets of a locking pin (2-4) seat assembly (2-1-5) after passing through the suspension joint (2-2), the heads of the locking pins (2-4) are installed in the ball sockets and are used for bearing the weight of a feeding device and a reentrant cone and a mud pad connected with the feeding device, the suspension joint (2-2) is respectively connected with a drill rod from top to bottom, the reentrant cone and the mud pad are placed on a seabed mud surface by lowering the drill rod, a core pipe (2-3) is installed inside the suspension joint (2-2), the core pipe (2-3) is connected with the locking pins (2-4) through suspension screws (2-5), and the suspension screws (2-5) are screwed into threaded holes of the core pipe (2-3) from unthreaded holes at The screw rod part of the suspension screw (2-5) is arranged in the core tube (2-3), the polished rod part is arranged in the lock pin (2-4), the polished rod of the lock pin (2-4) and the polished hole of the suspension screw (2-5) are in clearance tolerance fit, so that the lock pin (2-4) is connected with the core tube (2-3), the core tube (2-3) is suspended in the suspension joint (2-2), seal grooves are respectively arranged at the upper part and the lower part of a mounting hole of the lock pin (2-4) of the suspension joint (2-2), and seal grooves are respectively arranged at the upper part and the lower part of the contact surface of the core tube (2-3) and the suspension joint (2-2) for mounting a seal ring.
2. A reentrant cone feeding apparatus for offshore drilling according to claim 1, wherein:
the hanging seat (2-1-5-1) is in an external stepped cylinder form, the small-diameter end is installed in a hole formed in the circumference of the hanging outer sleeve (2-1-1), the end face of the small-diameter end is arc-shaped, the radian is equal to the inner diameter of the hanging outer sleeve (2-1-1), one end of the interior of the hanging seat (2-1-5-1) is provided with internal threads and is connected with the lock nut (2-1-5-2), one end of the interior of the hanging seat is provided with a ball socket, the diameter of the ball socket is the same as that of a spherical surface of the lock pin (2-4), the middle of the interior of the hanging seat is provided with a stepped hole;
the ejector rod (2-1-5-4) is a stepped shaft with a large middle part and small two ends, the ejector rod (2-1-5-4) is placed inside the hanging seat (2-1-5-1), one end of the ejector rod is inserted into a small hole inside the hanging seat (2-1-5-1), the middle large end limits the movement of the ejector rod (2-1-5-4) to prevent the ejector rod (2-1-5-4) from extending out of the hanging seat (2-1-5-1), and the other end of the ejector rod is used as a guide rod of the spring (2-1-5-3) and is inserted into the spring (2-1-5-3);
the middle main part of the lock pin (2-4) is cylindrical, one end face is spherical, the spherical surface is matched with a ball socket of the hanging seat (2-1-5-1), the other end face is in a cone frustum form, the large end of the cone frustum is close to the middle cylindrical section and has a diameter larger than that of the middle main body cylinder, the small end of the cone frustum is in contact with the core tube (2-3), the cone frustum can prevent the lock pin (2-4) from falling into a hole after the hanging joint (2-2) is lifted out of the hanging jacket (2-1-1), the inner part of the lock pin (2-4) is a stepped hole, the large diameter part is a threaded hole, the middle diameter part and the small diameter part are unthreaded holes, the hanging screw (2-5) is screwed into the threaded hole of the core tube (2-3) from the large diameter end of the lock pin (2-4), the core tube (2-3) is connected with the lock pin (2-4), and the nut of the hanging screw ( On the step surface, the step surface plays a limiting role in the suspension screw (2-5), the threaded hole of the lock pin (2-4) is used for installing a set screw, and the set screw plays a blocking role in the sheared nut section of the suspension screw (2-5), so that the sheared nut section of the suspension screw (2-5) can be prevented from falling out of the lock pin (2-4);
the outer part of the suspension joint (2-2) is in a stepped shaft form, the inner part of the suspension joint is in a stepped hole form, and the outer structure form is as follows from top to bottom: the uppermost end is an outer hexagon which is matched with an inner hexagon of the suspension outer sleeve (2-1-1), a connecting section of the outer hexagon is a large-diameter excircle, the middle position of the excircle is uniformly provided with 4 radial round holes vertical to the central axis of the suspension joint (2-2) along the circumferential direction, the aperture is the same as the diameter of the main body part of the lock pin (2-4), sealing grooves are respectively arranged above and below the 4 radial round holes for installing sealing rings, the connecting section of the outer circle with the large diameter is a small-diameter excircle, the lower end of the small-diameter excircle is a conical male screw thread for connecting a lower drill rod, the uppermost end in the inner part is a conical female screw thread for connecting an upper drill rod, the lower end of the conical female screw thread is a round hole with a decreasing diameter, the diameter of the round hole at the minimum position is more than or equal to the outer diameter of the pipe body at the lowest end of the core pipe (2, when the four lock pins (2-4) are tightly propped against the ball sockets of the hanging seat (2-1-5-1), the hole diameter of the hanging joint (2-2) is ensured to ensure that the lock pins (2-4) are not interfered in the radial direction;
the outer shape of the core tube (2-3) is in a dry shape, the large diameter of the upper end and the large diameter of the middle are respectively matched with an inner hole of the suspension joint (2-2), sealing grooves are respectively machined on the two large-diameter excircles, sealing rings are installed for sealing the upper position and the lower position of the core tube (2-3) and the suspension joint (2-2), the core tube (2-3) is sheared by the suspension screws (2-5) after being subjected to hydraulic pressure, the core tube (2-3) falls onto the step surface of the suspension joint (2-2), the small diameter section between the two large diameters of the core tube (2-3) is right opposite to the lock pin (2-4), when the core tube (2-3) is suspended by the suspension screws (2-5), the core tube (2-3) plays a role in limiting the lock pin (2-4), and the lock pin (2-4) is fixed between the suspension seat (2-1-5-1) and the core tube (2-3) In the middle, a spring (2-1-5-3) in a hanging seat (2-1-5-1) is compressed, when a hanging screw (2-5) is cut off, a core tube (2-3) moves downwards, the radial limitation of the core tube (2-3) on a lock pin (2-4) is eliminated, so that the compressed spring (2-1-5-3) enables the lock pin (2-4) to be ejected away from a ball socket through a mandril (2-1-5-4), the conical table end of the lock pin (2-4) enters a small-diameter section in the middle of two large diameters of the core tube (2-3), a through hole is formed in the core tube (2-3), a large inverted conical surface is processed at the upper end and used for placing a steel ball (2-7), and the steel ball (2-7) is arranged from top to bottom when the hanging screw (2-5) needs to be cut off, the steel balls (2-7) fall on the inverted conical surface, the core tube (2-3) is plugged, and then the suspension screws (2-5) are sheared by pressing;
the positioning pin (2-6) is a cylindrical pin, one end of the cylindrical pin is a plane, the other end of the cylindrical pin is a conical surface, one end of the conical surface is connected to the flange hole of the lower flange (2-1-4) in a threaded mode, the end portion of the positioning pin (2-6) is welded after the positioning pin (2-6) is installed in place, and the height of a welding bead does not exceed the plane of the lower flange (2-1-4).
3. The reentrant cone feeder for offshore drilling according to claim 1, wherein the number of the plurality of circular holes uniformly formed in the circumference of the middle position of the suspension outer sleeve (2-1-1) is 4 or more.
4. The reentrant cone feeder for offshore drilling according to claim 1, characterized in that the inner upper end of the suspension jacket (2-1-1) may be other regular polygons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254370.3A CN111271016A (en) | 2020-04-02 | 2020-04-02 | Reentry cone feeding device for ocean drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254370.3A CN111271016A (en) | 2020-04-02 | 2020-04-02 | Reentry cone feeding device for ocean drilling |
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| CN111271016A true CN111271016A (en) | 2020-06-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111411894A (en) * | 2020-04-02 | 2020-07-14 | 中国地质科学院勘探技术研究所 | Reentry cone lowering method based on pipe following drilling process |
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2020
- 2020-04-02 CN CN202010254370.3A patent/CN111271016A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111411894A (en) * | 2020-04-02 | 2020-07-14 | 中国地质科学院勘探技术研究所 | Reentry cone lowering method based on pipe following drilling process |
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