CN112696167A - Underground fishing device - Google Patents
Underground fishing device Download PDFInfo
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- CN112696167A CN112696167A CN201911014134.8A CN201911014134A CN112696167A CN 112696167 A CN112696167 A CN 112696167A CN 201911014134 A CN201911014134 A CN 201911014134A CN 112696167 A CN112696167 A CN 112696167A
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- spiral spring
- frustum
- rod
- fishing device
- guide rod
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- 238000003825 pressing Methods 0.000 claims abstract description 38
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004064 recycling 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention provides a downhole fishing device, which comprises: a barrel; the upper joint is detachably connected to the upper end of the cylinder body; the bottom of the slip is matched with the conical surface of the inner wall of the cylinder; the spiral spring provides downward pressing force for the slip after being compressed; the top connection includes the connector, still includes: the round rod is positioned at the bottom of the connecting body, and the outer diameter of the round rod is smaller than the inner diameter of the spiral spring; the frustum is arranged below the round rod, the outer conical surface of the frustum gradually inclines inwards from top to bottom, the upper end of the spiral spring is sleeved with the jacking pressure on the outer conical surface of the frustum, the maximum outer diameter of the frustum is larger than the inner diameter of the spiral spring, and a diameter difference which is radially deformed when the upward jacking force applied to the spiral spring is larger than a certain value is formed between the maximum outer diameter of the frustum and the inner diameter of the spiral spring, so that the diameter difference can cross the frustum and is sleeved outside the round rod. Has the advantages that: not only can satisfy the release requirement when necessary, and the installation is very convenient, rotates the top connection in addition when dismantling, can screw out coil spring with the frustum, and it is also very convenient to dismantle, the barrel used repeatedly of being convenient for.
Description
Technical Field
The invention relates to a downhole fishing device.
Background
At present, when pressure tests are carried out on domestic oil and gas wells and corrosion hanging pieces in the wells are monitored, the well hanger is commonly used, the fishing head on the upper portion of the well hanger is mainly of a cone (shown in figure 1), a hemisphere (shown in figure 2) and a cylinder (shown in figure 3) type structure, the fishing head is provided with a step surface which is a cone step surface 1, a hemisphere step surface 2 and a cylinder step surface 3 respectively, and therefore a special fishing device is needed to hook the step surfaces to fish the well. In addition, objects such as broken sucker rods and oil pump cores frequently fall to the bottom of the well in the process of oil field operation to cause underground accidents, and in order to avoid influencing the oil production, the objects need to be salvaged by utilizing a salvage device.
The utility model discloses a chinese utility model patent that grant bulletin number is CN203175451U discloses an oil field fishing tool in pit, including casing (the barrel promptly), be provided with the spring in the barrel, jack catch and bipyramid, wherein the bipyramid passes through the shear pin and connects at the barrel lower extreme, and the bipyramid has last conical surface and lower conical surface, and inside the lower conical surface was used for guiding the fishing head of junk in the pit got into the barrel, upward the conical surface laminated mutually with the conical surface of jack catch bottom, is provided with the clamp on the inner wall of jack catch bottom, and the clamp upper end is a plane, and the lower extreme is the conical surface. During the use, adopt the steel wire to go into the well with fishing tool down, the fishing head of the thing that falls in the pit gets into inside the barrel under the guide of the bipyramid lower conical surface, upwards push away the jack catch when fishing head contacts the clamp of jack catch, the clamp also takes place radially to open in upward movement, make fishing head can get into the jack catch the inside through the clamp, the jack catch moves down under the spring action power afterwards, and take place radial shrink under the bipyramid upper conical surface's effect, hold the fishing rod tightly, then lift fishing tool, under the thing gravity action that falls in the pit, the clamp is tightly holding fishing head, upward pulling force is exerted to fishing head's step face to the upper end plane of clamp, thereby salvage the well with the target.
When the fishing tool is used, when the underground falling objects are clamped and cannot be lifted out, once the tensile force of the steel wire exceeds a certain value, the shear pin is sheared off, the double cones, the clamping jaws and the spring in the fishing tool cylinder body can fall off, the underground falling objects are released, the steel wire lifts the cylinder body, and the steel wire is prevented from being pulled off.
However, when the shear pin is used to release the downhole junk, the configuration requirement of the shear pin is relatively high, the shear force of the shear pin is too large, so that the shear pin is not yet sheared when the steel wire is pulled apart, and the shear force of the shear pin is too small, so that the target falls off in the normal fishing process, and it is very difficult to keep the shear force of the shear pin at a proper value. In addition, the shear pin is inconvenient to install, needs to be assembled on the barrel and the double cones in an interference mode, is labor-consuming to operate, is difficult to clean after being cut off, and is not beneficial to recycling of the barrel.
Disclosure of Invention
The invention aims to provide the underground fishing device which can meet the releasing requirement when necessary, is convenient to install and disassemble and is convenient for the barrel to be repeatedly used.
In order to achieve the purpose, the underground fishing device adopts the following technical scheme:
a downhole fishing device, comprising:
the axis of the cylinder extends along the up-down direction, and the lower end surface of the cylinder is a conical guide surface which gradually inclines inwards from bottom to top so as to guide the fishing head on the underground falling object to enter the cylinder;
the upper joint is arranged at the upper end of the barrel and is used for being connected with a salvaging pipe column;
the slip is arranged in the cylinder body and provided with at least two segments, the inner wall of the slip is provided with a clamping tooth for clamping the fishing head, and the outer side wall of the bottom of the slip is matched with the inner wall of the bottom of the cylinder body through a conical surface which gradually inclines inwards from top to bottom;
the spiral spring is arranged in the cylinder body and positioned above the slips and used for providing downward elastic pressing force for the slips after being compressed;
the top connection detachable connection is in the upper end of barrel, and the top connection still includes including being used for the connector that is connected respectively with barrel and salvage tubular column:
the round rod is positioned at the bottom of the connecting body, the axis of the round rod extends along the vertical direction, and the outer diameter of the round rod is smaller than the inner diameter of the spiral spring;
the frustum is arranged below the round rod and provided with an outer conical surface which gradually inclines inwards from top to bottom, and the outer conical surface of the frustum is used for sleeving and jacking the upper end of the spiral spring so that the spiral spring can provide the maximum elastic pressing force for the slips; the maximum outer diameter of the frustum is larger than the inner diameter of the spiral spring, a set diameter difference is formed between the maximum outer diameter of the frustum and the inner diameter of the spiral spring, and the diameter difference enables the spiral spring to be radially deformed when upward jacking force applied to the spiral spring is larger than a certain value, so that part or all of the spiral spring can cross the frustum and is sleeved outside the round rod, and elastic pressing force provided by the spiral spring to the slip is reduced or disappears.
The technical scheme of the underground fishing device has the beneficial effects that: the round rod and the frustum are arranged below the connecting body, the maximum outer diameter of the frustum is larger than the inner diameter of the spiral spring, the upper end of the spiral spring is sleeved and pressed on the outer conical surface of the frustum, when the slips are not fished under normal conditions, the compressed spiral spring provides downward elastic pressing force for the slips, the slips move downwards in the barrel, and the clamping teeth are in a contraction state under the matching action of the conical surfaces between the outer side wall of the bottom of the slips and the inner wall of the bottom of the barrel.
During salvaging, the salvaging head of the underground falling object enters the cylinder under the action of the conical guide surface of the cylinder and pushes the slip upwards, the slip moves upwards to reset and open, the spiral spring is further compressed, the salvaging head enters the slip, then the clamping teeth tightly clamp the salvaging head under the action of the acting force of the spiral spring and the gravity action of the underground falling object, and the salvaging device and the underground falling object can be lifted out of the well at the moment.
When the underground falling object is blocked and cannot be lifted out, downward acting force can be rapidly exerted on the fishing device through the fishing pipe column on the upper portion, so that the spiral spring is subjected to larger upward jacking force instantly, the maximum outer diameter of the frustum and the inner diameter of the spiral spring have a set diameter difference, when the upward jacking force is large enough, the spiral spring can be radially deformed to cross the frustum and be sleeved outside the round rod, part or all of the spiral spring can be sleeved outside the round rod through multiple operations, so that the residual spiral spring below the frustum is reduced or eliminated, the downward pressing force applied to the slips can be reduced or eliminated, the slips can be moved upwards to reset and expand and are separated from the fishing head, the fishing device can be lifted out, and the underground falling object can be released.
After the fishing device is pulled out, the upper joint and the barrel body are detachably connected, so that the upper joint can be detached, a part of springs are still arranged on the round rod and the frustum, then the helical line characteristic of the spiral spring is utilized, the upper joint is rotated, the frustum rotates and moves in the gap between the spiral spring ring and the ring, and the frustum can be rotated out, so that the separation from the spiral spring is realized.
Therefore, the underground fishing device can meet the releasing requirement when necessary, the spiral spring is matched with the frustum, the installation is very convenient, in addition, the frustum can be screwed out of the spiral spring by rotating the upper joint during the disassembly, the disassembly is also very convenient, and the repeated use of the barrel is convenient.
Furthermore, in order to transmit the acting force of the spiral spring to the slips conveniently and to facilitate the manufacture of the slips, a pressing plate is further arranged above the slips in the cylinder body, and the lower end of the spiral spring is in top press fit with the upper end face of the pressing plate.
Furthermore, in order to facilitate installation of the coil spring and guide axial compression of the coil spring, a guide structure for guiding the axial compression of the coil spring is arranged on the upper end face of the pressing plate.
Furthermore, in order to facilitate the arrangement of the guide structure, the guide structure is a guide rod with an axis extending along the vertical direction, and the spiral spring is sleeved outside the guide rod.
In order to further improve the guiding effect, the upper end of the guide rod penetrates upwards into the round rod and the frustum, and guide rod through holes are formed in the round rod and the frustum.
Furthermore, in order to facilitate the detachment of the underground falling object after the underground falling object is lifted out of the well, the slip is opened to release the clamping of the fishing head, the guide rod through hole extends upwards into the connecting body, the connecting body is provided with an insertion hole for the external detaching rod to be inserted in the radial direction and to move up and down relative to the connecting body after being inserted, the insertion hole is communicated with the guide rod through hole in the connecting body so that the detaching rod can be inserted into the guide rod through hole, and a matching structure which is matched with the detaching rod and moves upwards under the upward lifting action force of the detaching rod is arranged on the guide rod corresponding to the insertion hole.
Furthermore, in order to facilitate force application from two ends and further move the guide rod upwards more easily, the number of the jacks is two, and the two jacks are located in the same radial direction.
Furthermore, make things convenient for the releasable connection between top connection and the barrel, make things convenient for the assembly of top connection and the setting of jack simultaneously, connector and barrel threaded connection, the connector is including conveniently revolving the hexagonal prism of top connection, and two jacks set up respectively on two sides that the hexagonal prism is relative.
Furthermore, in order to facilitate the processing and manufacturing of the guide rod and the arrangement of a matching structure, the guide rod comprises a guide rod body, a connecting rod fixed at the upper end of the guide rod body and a top plate fixed at the upper end of the connecting rod, wherein the diameter of the connecting rod is smaller than that of the guide rod body, and the matching structure is formed by the bottom surface of the top plate.
Further, in order to prevent the top end of the slip from deforming inwards when being pressed, the bottom of the pressure plate is provided with a contact body which is contacted with the inner wall of the top of the slip to guide the deformation of the slip.
Drawings
FIG. 1 is a schematic structural diagram of a cone fishing head in the prior art;
FIG. 2 is a schematic structural view of a hemispherical fishing head in the prior art;
FIG. 3 is a schematic structural view of a cylindrical fishing head in the prior art;
FIG. 4 is a schematic view of the downhole fishing device of the present invention prior to fishing a downhole junk;
FIG. 5 is a schematic view of the downhole fishing apparatus of the present invention shown in a configuration separated from a stuck downhole junk.
In the figure: 1. a cone step surface; 2. a hemisphere step surface; 3. a cylindrical step surface; 10. a barrel; 11. an upper conical surface; 12. a tapered guide surface; 20. slips; 30. an upper joint; 31. an upper column; 32. a hexagonal prism; 33. a lower column; 34. a round bar; 35. a frustum; 36. perforating a guide rod; 37. a jack; 40. a coil spring; 50. a guide bar; 51. a guide rod body; 52. a connecting rod; 53. a top plate; 60. pressing a plate; 70. a contact body.
Detailed Description
An embodiment of a downhole fishing device according to the present invention, as shown in fig. 4 and 5, is used for a fishing hanger, and includes a cylindrical body 10 having an axis extending in an up-down direction, and the cylindrical body 10 has openings at upper and lower ends thereof. The upper end of the barrel 10 is in threaded connection with an upper joint 30, the upper joint 30 sequentially comprises an upper cylinder 31, a hexagonal cylinder 32, a lower cylinder 33, a round rod 34 and a frustum 35 from top to bottom, the upper cylinder 31 and the lower cylinder 33 are both cylinders, external threads are machined on the outer surfaces of the upper cylinder 31 and the lower cylinder 33, the upper cylinder 31 is used for being connected with an upper fishing pipe column, and the lower cylinder 33 extends into the barrel 10 and is in threaded connection with the barrel 10, so that the upper cylinder 31, the hexagonal cylinder 32 and the lower cylinder 33 form connectors which are arranged on the upper joint and are respectively connected with the barrel and the fishing pipe column.
The slip 20 is arranged in the cylinder 10, the inner wall of the slip 20 is provided with a clamping tooth for clamping the fishing head, the slip 20 in the embodiment has three petals, and the petals are arranged separately. The outer side wall of the bottom of the slip 20 is matched with the inner wall of the bottom of the cylinder 10 through conical surfaces which are gradually inclined inwards from top to bottom, namely an upward upper conical surface 11 is arranged at the bottom of the cylinder 10, a downward lower conical surface is arranged at the bottom of the slip 20, and the upper conical surface 11 and the lower conical surface are gradually inclined inwards from top to bottom and have the same taper. In addition, the lower end surface of the cylinder 10 is a tapered guide surface 12 which is gradually inclined inward from bottom to top to guide the fishing head of the hanger into the interior of the cylinder 10.
The cylinder 10 is further provided with a pressing plate 60, and the pressing plate 60 is located above the slips 20 and used for pressing the slips 20 downwards to move the slips 20 downwards, so that the lower conical surface at the bottom of the slips 20 is in conical fit with the upper conical surface 11 of the cylinder 10, and the teeth are in a contracted state, as shown in fig. 4. In order to prevent the slips 20 from being deformed inward when the pressing plates 60 press the slips 20 downward, contact bodies 70, which are cylindrical bodies, are provided at the bottom of the pressing plates 60 to contact the inner walls of the top of the slips 20 to guide the deformation of the slips 20, and are inserted between the tops of the respective slips.
A coil spring 40 is disposed between the upper joint 30 and the pressing plate 60, and the coil spring 40 is used for providing a downward elastic pressing force to the pressing plate 60 after being compressed so as to press the slips 20. The upper end surface of the pressing plate 60 is provided with a guide structure for guiding the axial compression of the coil spring 40, the guide structure in this embodiment is a guide rod 50 fixed on the upper end surface of the pressing plate 60, the guide rod 50 includes a guide rod body 51 with an axis extending in the up-down direction, a connecting rod 52 fixed on the upper end of the guide rod body 51 and having a diameter smaller than that of the guide rod body 51, and a top plate 53 fixed on the upper end of the connecting rod 52.
The upper end of the guide rod body 51 passes through the frustum 35 and the round rod 34 upwards and penetrates into the lower cylinder 33, and the connecting rod 52 and the top plate 53 pass through the lower cylinder 33 and extend into the hexagonal prism 32, so that the guide rod through hole 36 which penetrates through the hexagonal prism 32, the lower cylinder 33, the round rod 34 and the frustum 35 is formed.
In the present embodiment, the hexagonal prism 32 is used to facilitate screwing the upper connector 30 and screwing the upper connector 30 onto the barrel 10, and in addition, when the downhole fishing device is not used for fishing and after fishing the hanger, a certain distance is provided between the top plate 53 and the upper cylinder 31, so that in order to facilitate detaching the hanger, two opposite side walls of the hexagonal prism 32 are provided with insertion holes 37 for inserting external detaching rods, and the two insertion holes 37 are located in the same radial direction and are both communicated with the guide rod through holes in the hexagonal prism 32, so that the detaching rods can completely penetrate through the hexagonal prism 32. In addition, the two insertion holes 37 are also long holes extending in the up-down direction, so that the dismounting rod has a space capable of moving up and down relative to the hexagonal prism 32, and the top plate 53 is located at a position just corresponding to the position of the insertion hole.
When the device is used, two dismounting rods penetrate through the hexagonal prism 32 and are respectively positioned at two sides of the connecting rod 52, upward lifting acting force is applied to two ends of each dismounting rod by hands, the dismounting rods are in stop fit with the bottom surface of the top plate 53, the top plate 53 is driven to move upwards, therefore, the bottom surface of the top plate 53 forms a matching structure matched with the dismounting rods on the guide rod, the pressing plate 60 moves upwards along the top plate 53 when the top plate 53 moves upwards, the pressing on the slips 20 is relieved, the slips 20 can be reset upwards and opened along the conical surface of the inner wall of the bottom of the cylinder, and the clamping teeth can be separated from the fishing head.
The spiral spring 40 is sleeved outside the guide rod body 51, the bottom end of the spiral spring 40 is pressed against the pressing plate 60, the frustum 35 is provided with a frustum outer conical surface which gradually inclines inwards from top to bottom, the upper end of the spiral spring 40 is sleeved and pressed against the frustum outer conical surface, the spiral spring 40 can provide the maximum elastic pressing force for the slip, and the maximum outer diameter of the frustum 35 is larger than the inner diameter of the spiral spring. When the fishing assembly is assembled, the coil spring 40 is pre-compressed, so that the pressure plate 60 is pressed downward, the pressure plate 60 presses the slip 20 downward, and the teeth of the slip 20 are contracted, as shown in fig. 4 and 1, and the minimum distance a between the teeth is smaller than the diameter b of the step surface of the fishing head.
In order to facilitate the release of the hanger when it is stuck, the present invention sets the outer diameter of the round bar 34 to be smaller than the inner diameter of the coil spring 40, the round bar 34 extends up and down and has a certain length, while the maximum outer diameter of the frustum 35 and the inner diameter of the coil spring 40 have a set diameter difference therebetween, this difference in diameter enables the helical spring 40 to be deformed radially when it is subjected to an upward thrust greater than a certain value, so as to partially pass over the frustum 35 and be fitted outside the rod 34, that is, a part of the number of turns of the coil spring may be transferred to the outside of the round bar 34 as shown in fig. 5, so that the number of turns of the spring fitted around the outside of the guide bar body 51 becomes smaller, thereby releasing the pressure to the pressing plate 60, and then the slip can move upwards and the clamping teeth are opened, and the minimum distance a' between the clamping teeth is larger than the diameter b of the step surface of the fishing head.
The assembly process of the underground fishing device comprises the following steps:
firstly, the slips 20 are arranged in the cylinder body 10 from top to bottom, then the spiral spring 40 is sleeved outside the guide rod 50, the pressing plate 60 and the contact body 70 are arranged in the cylinder body 10 from top to bottom, finally the upper connector 30 is connected to the upper end of the cylinder body 10 in a threaded mode, the guide rod through hole 36 needs to be aligned with the guide rod when the connection is carried out, the guide rod penetrates into the upper connector 30, and the upper end of the spiral spring 40 is sleeved and pressed on the outer conical surface of the frustum after the connection.
The working principle of the underground fishing device is as follows:
when the fishing device is used, the fishing device is connected with a fishing pipe column at the upper part through the upper part column body 31, then the fishing device is put into a well along with the fishing pipe column, when the fishing device reaches the position of the hanger, a fishing head of the hanger enters the barrel body 10 under the guide of the conical guide surface 12, then the fishing head pushes the slip 20 upwards to enable the slip 20 to move upwards, the spiral spring 40 is further compressed, the slip 20 resets and the clamping teeth stretch, the fishing head enters the inside of the slip 20, then the slip 20 moves downwards under the action of the spiral spring 40, the clamping teeth clamp the step surface on the fishing head, then the pipe column is lifted up to lift the hanger out, and in the process, the clamping teeth tightly clamp the fishing head under the action of the gravity of the hanger to achieve the effect of automatic locking.
The above process is the same as the prior art, and has two differences, one is that when the hanger is blocked and cannot be lifted out, the fishing device is rapidly applied with downward acting force through the fishing pipe column at the upper part, namely the fishing head is hammered downwards, so that the fishing head rapidly impacts the contact body 70 and the pressing plate 60 upwards, and further the spiral spring 40 is instantly subjected to larger upward jacking force, because a set diameter difference is formed between the maximum outer diameter of the frustum 35 and the inner diameter of the spiral spring 40, when the upward jacking force is large enough, the spiral spring 40 can generate radial deformation, so that the spiral spring passes through the frustum 35 and is sleeved outside the circular rod 34, as shown in fig. 5, a part of circles of springs are sleeved outside the circular rod 34 by repeatedly hammering the fishing head, so that the circles of the springs sleeved outside the guide rod body 51 are reduced, and the pressing plate 60 does not have the capability of tightly pressing the slips 20 any more, the slips 20 are thus reset upward and opened to disengage the fishing head, allowing the hanger to be released.
After the hanger is released, the fishing device is pulled out, and in order to enable the fishing device to be reused, the upper joint 30 needs to be detached from the barrel 10, at this time, a part of the spiral spring is still carried on the round rod 34 and the frustum 35, and then the upper joint 30 is rotated by utilizing the spiral line characteristic of the spiral spring 40, so that the frustum 35 can rotate in the gap between the circles of the spiral spring 40, and the frustum 35 can be rotated out, and the separation from the spiral spring 40 is realized. Therefore, the underground fishing device can meet the releasing requirement when necessary, the spiral spring 40 is matched with the frustum 35 and the guide rod body 51, the installation is very convenient, in addition, the upper joint 30 is rotated when the fishing device is disassembled, the frustum can be screwed out of the spiral spring, the disassembly is also very convenient, and the repeated use of the fishing device is convenient.
Another difference between the downhole fishing device of the present invention and the prior art is that: after the hanger is normally lifted out, the hanger can be firstly detached because the length of the whole tool string is large and the lifting movement is inconvenient, at this time, two detaching rods are utilized to penetrate through the hexagonal prism 32, upward acting force is applied to two ends of the detaching rods by hands, the detaching rods are in stop fit with the bottom surface of the top plate 53, the top plate 53 is driven to move upwards, and then the pressing plate 60 and the contact body 70 below are driven to synchronously move upwards, so that the clamping slip 20 is released from being pressed, and the clamping teeth can be in an open state and can be separated from the fishing head. The two dismounting rods are adopted in the mode, so that the top plate 53 can move upwards, force can be applied from two ends, and the operation is more convenient and labor-saving.
In other embodiments of the downhole fishing device, the downhole fishing device may also be used to fish other downhole falling objects, such as a broken sucker rod, a pump core of an oil pump, etc., as long as the downhole falling object is provided with the fishing head as shown in fig. 1 to 3.
In other embodiments of the downhole fishing device, when the fishing head is knocked down, all the spiral springs can cross the frustum and are sleeved outside the round rod, and the elastic pressing force is also eliminated.
In other embodiments of the downhole fishing device, when the length of the coil spring is relatively long, even if a part of coils of the coil spring are sleeved outside the round rod through the downward hitting fishing head, the number of the remaining coils of the coil spring is still relatively large, and the downward pressing force is still applied to the slips, but the pressing force is relatively small and is far smaller than the elastic deformation restoring force of the slips, so that the slips can overcome the part of pressing force, move upwards, reset and expand, and release of downhole falling objects is achieved.
In other embodiments of the downhole fishing device, the bottom of the pressure plate may not be provided with a contact body, and the pressure plate directly presses the slips downwards.
In other embodiments of the downhole fishing device, the guide rod may also be formed by only the guide rod body, and at this time, a neck-reducing groove may be formed in the guide rod body, and a step surface of the neck-reducing groove forms a matching structure with the dismounting rod, or a radially penetrating through hole may be directly formed in the guide rod body, and the dismounting rod directly penetrates through the through hole, and at this time, the through hole forms a matching structure with the dismounting rod.
In other embodiments of the downhole fishing device, when the upper joint is in threaded connection with the barrel, the hexagonal prism structure may not be provided on the upper joint, for example, the entire upper joint is a cylinder structure, and the jack is directly machined on the cylinder, or even if the hexagonal prism structure is provided on the upper joint, the jack may not be machined on the hexagonal prism structure, but may be machined on other parts of the upper joint.
In other embodiments of the downhole fishing device, the upper joint and the cylinder may not be in threaded connection, for example, they may be connected by screws, in which case, radially extending screw through holes may be provided on the cylinder, and radially extending threaded holes may be provided on the upper joint, and the screws may be passed through the screw through holes and then engaged with the threaded holes on the upper joint, so as to fix the upper joint to the cylinder, and several screws may be provided to ensure the fixing effect.
In other embodiments of the downhole fishing device, the insertion hole on the upper joint may not be a long hole extending up and down, but may have a diameter larger than that of the circular hole of the dismounting rod, so that the dismounting rod may have a space to move up and down.
In other embodiments of the downhole fishing device, there may be only one receptacle on the upper sub.
In other embodiments of the downhole fishing device, when the guide rod through hole extends upwards into the connecting body, the connecting body may not be provided with the insertion hole, and the downhole falling object may be detached through other structures, for example, a long hole extending upwards and downwards may be provided on the barrel, and a shift rod extending along the radial direction of the barrel may be fixed on the pressure plate, and an end portion of the shift rod extends out of the barrel from the long hole, and the pressure plate may be moved upwards by pulling the shift rod upwards, so as to release the compression of the slips.
In other embodiments of the downhole fishing device, the guide structure may not be a guide rod, for example, a groove may be provided in the pressure plate, and the bottom of the coil spring is inserted into the groove, which is the guide structure.
In other embodiments of the downhole fishing device, the upper end surface of the pressure plate may not be provided with a guide structure, and the lower end of the coil spring is directly pressed and fitted with the upper end surface of the pressure plate.
In other embodiments of the downhole fishing device, the barrel may not be provided with a pressing plate, for example, like the slip in patent document CN203175451U, the lower end of the coil spring is directly in press fit with the slip, but in order to release the downhole falling object smoothly when the downhole falling object is stuck, an inner flange needs to be provided on the inner wall of the slip, so that when the fishing head is knocked down, the fishing head can impact the inner flange upwards, and then the coil spring is subjected to a large upward pushing force instantly by the upward movement of the slip, and the other principles are the same as those of the first embodiment.
In other embodiments of the downhole fishing device, the slips may not be separated from each other, for example, the upper ends of the slips are connected together by a top plate, and the pressure plate is not required to be arranged.
In other embodiments of the downhole fishing device, the connection structure on the upper sub for connection to the upper fishing string may also be other than external threads, such as internal threads, or by a screw connection, the connection structure being a radially extending threaded bore.
In other embodiments of the downhole fishing apparatus, the slips may have only two flaps, but may have four or more flaps.
Claims (10)
1. A downhole fishing device, comprising:
the axis of the cylinder extends along the up-down direction, and the lower end surface of the cylinder is a conical guide surface which gradually inclines inwards from bottom to top so as to guide the fishing head on the underground falling object to enter the cylinder;
the upper joint is arranged at the upper end of the barrel and is used for being connected with a salvaging pipe column;
the slip is arranged in the cylinder body and provided with at least two segments, the inner wall of the slip is provided with a clamping tooth for clamping the fishing head, and the outer side wall of the bottom of the slip is matched with the inner wall of the bottom of the cylinder body through a conical surface which gradually inclines inwards from top to bottom;
the spiral spring is arranged in the cylinder body and positioned above the slips and used for providing downward elastic pressing force for the slips after being compressed;
its characterized in that, top connection releasable connection is in the upper end of barrel, and the top connection still includes including being used for the connector that is connected respectively with barrel and salvage tubular column:
the round rod is positioned at the bottom of the connecting body, the axis of the round rod extends along the vertical direction, and the outer diameter of the round rod is smaller than the inner diameter of the spiral spring;
the frustum is arranged below the round rod and provided with an outer conical surface which gradually inclines inwards from top to bottom, and the outer conical surface of the frustum is used for sleeving and jacking the upper end of the spiral spring so that the spiral spring can provide the maximum elastic pressing force for the slips; the maximum outer diameter of the frustum is larger than the inner diameter of the spiral spring, a set diameter difference is formed between the maximum outer diameter of the frustum and the inner diameter of the spiral spring, and the diameter difference enables the spiral spring to be radially deformed when upward jacking force applied to the spiral spring is larger than a certain value, so that part or all of the spiral spring can cross the frustum and is sleeved outside the round rod, and elastic pressing force provided by the spiral spring to the slip is reduced or disappears.
2. A downhole fishing device as claimed in claim 1, wherein a pressure plate is further provided in the body above the slips, and a lower end of the coil spring is press-fitted against an upper end surface of the pressure plate.
3. A downhole fishing device as claimed in claim 2, wherein the pressure plate is provided with a guide structure on an upper end surface thereof for guiding axial compression of the coil spring.
4. A downhole fishing device according to claim 3, wherein the guiding structure is a guide rod having an axis extending in an up-down direction, and the coil spring is sleeved outside the guide rod.
5. A downhole fishing device according to claim 4, wherein the upper end of the guide rod is upwardly penetrated into the round rod and the frustum, and the round rod and the frustum are provided with guide rod through holes.
6. A downhole fishing device according to claim 5, wherein the guide rod through hole extends upwards into the connecting body, a jack is provided on the connecting body for the external dismounting rod to be inserted in the radial direction and to be able to move up and down relative to the connecting body after insertion, the jack is communicated with the guide rod through hole in the connecting body for the dismounting rod to be inserted into the guide rod through hole, and a matching structure for matching with the dismounting rod to move upwards under the upward pulling force of the dismounting rod is provided on the guide rod corresponding to the jack.
7. A downhole fishing device as claimed in claim 6, wherein there are two of the receptacles, both receptacles being located in the same radial direction.
8. A downhole fishing device according to claim 7, wherein the connecting body is threadedly connected to the barrel, the connecting body comprises a hexagonal prism for facilitating screwing of the connector, and the two insertion holes are respectively provided on two opposite sides of the hexagonal prism.
9. A downhole fishing device according to any one of claims 6 to 8, wherein the guide rod comprises a guide rod body, a connecting rod fixed at the upper end of the guide rod body and having a diameter smaller than that of the guide rod body, and a top plate fixed at the upper end of the connecting rod, wherein the matching structure is formed by the bottom surface of the top plate.
10. A downhole fishing device according to any of claims 1 to 8, wherein the bottom of the pressure plate is provided with a contact body which contacts an inner wall of the top of the slip to guide the slip to deform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014134.8A CN112696167B (en) | 2019-10-23 | 2019-10-23 | Underground fishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014134.8A CN112696167B (en) | 2019-10-23 | 2019-10-23 | Underground fishing device |
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| CN112696167A true CN112696167A (en) | 2021-04-23 |
| CN112696167B CN112696167B (en) | 2022-07-26 |
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| CN201911014134.8A Active CN112696167B (en) | 2019-10-23 | 2019-10-23 | Underground fishing device |
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| GB263057A (en) * | 1926-07-26 | 1926-12-23 | John Ferdinand Cailloux | Improvements in and relating to overshots for use in well drilling operations |
| CN2082756U (en) * | 1991-03-18 | 1991-08-14 | 大港石油管理局第一采油厂 | Grab-covering type fishing collar |
| CN2646372Y (en) * | 2003-09-25 | 2004-10-06 | 大庆油田有限责任公司 | Pressure spring type screw thread slips for salvaging |
| CN202055789U (en) * | 2011-05-17 | 2011-11-30 | 阜宁县石油机械有限公司 | High-performance sucker rod socket |
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| CN112696167B (en) | 2022-07-26 |
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