CN218912837U - Concave bottom type milling slip socket for salvaging objects falling into well - Google Patents

Abstract

The utility model discloses a concave bottom type milling slip socket for salvaging objects falling into a well, which comprises an upper joint, a cylinder body, a baffle ring, slips and a bowl-shaped concave bottom type milling head, wherein the cylinder body is connected with the bottom of the upper joint through threads, the bowl-shaped concave bottom type milling head is connected with the bottom of the cylinder body through threads, the baffle ring is placed at the threaded connection position of the bowl-shaped concave bottom type milling head and the slips, the baffle ring is screwed and fixed by threads between the bowl-shaped concave bottom type milling head and the slips, an upper taper hole with a large upper part and a small lower part is formed in the bowl-shaped concave bottom type milling head, the slips are positioned in the upper taper hole, and a lower taper hole is formed in the bottom of the bowl-shaped concave bottom type milling head. The milling function of the utility model can achieve the effects of covering unstable falling objects of small pieces, repairing the tops of the falling objects, removing annular barriers of the falling objects, including mud sand, cement blocks, small pieces, setting slips and the like, normalizing the outer diameter of the falling objects, and removing or partially removing the stuck points of the falling objects.

Description

Concave bottom type milling slip socket for salvaging objects falling into well

Technical Field

The utility model relates to the technical field of oil and gas field operation tools, in particular to a concave bottom type milling slip socket for salvaging objects falling in a well.

Background

In the drilling or underground operation process of an oil-gas field, an unstable small part drop is often required to be sleeved and milled, the top part of the unstable small part drop is damaged and irregular drop is required to be drilled, short and thick columnar drop such as a bridge plug, a releasing packer and the like are required to be fished, and long and thin rod-shaped blocked drop such as an oil pipe, a drill collar, a weighting rod, an electrical measuring instrument and the like are required to be fished, so that the existing tool for sleeved and milled and fished has some defects in use, such as: in the past, the next pipe column is required to be started for milling operation, so that the annular barriers (including silt, cement blocks, small fragments, setting slips and the like) of the falling objects are removed, the top of the falling objects are repaired, the outer diameters of the falling objects are standardized, and the effect of removing or partially removing the clamping points of the falling objects is achieved, and then a fishing tool is put into the pipe column for fishing operation.

At present, when the unstable small part and the irregular falling object of top damage are milled in the cover, be difficult for drawing in its top, introduce the tool inner chamber to the falling object, the operation degree of difficulty is big, intensity of labour is big, and the efficiency of construction is low, and the operating cycle is long, causes inconvenience when salvaging the use. To this end we propose a concave bottom type milling slip socket for fishing well junk.

Disclosure of Invention

The utility model mainly aims to provide a concave bottom type milling slip socket for fishing objects falling in a well, which can effectively solve the problems in the background technology.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a concave bottom formula cover mills slips and drags for a section of thick bamboo for salvaging well internal junk, includes top connection, barrel, keeps off ring, slips and bowl form concave bottom formula cover cutter head, top connection bottom threaded connection has the barrel, barrel bottom threaded connection has bowl form concave bottom formula cover cutter head, keeps off the ring has been placed with slips threaded connection department, and keeps off the ring and receive bowl form concave bottom formula cover cutter head and slips between the screw tightening fixed, the big-end-up's last taper hole has been seted up in the bowl form concave bottom formula cover cutter head, the slips is located the taper hole, the taper hole has been seted up to bowl form concave bottom formula cover cutter head inner bottom.

Further, a movable space for providing length of the slips and moving up and down is reserved between the baffle ring and the slips.

Further, the center of the baffle ring is provided with a central through hole with the inner diameter larger than that of the bowl-shaped concave bottom type milling head.

Further, the slips are composed of two groups of split slips, a step is arranged between the split slips to be mutually overlapped, and after the split slips are folded, the upper section forms a circular tube shape, and the lower section forms a cone shape.

Further, the top in the upper joint is provided with standard threads for external tubular string threaded connection.

Compared with the prior art, the utility model has the following beneficial effects:

1. the milling function of the utility model can achieve the effects of covering unstable falling objects of small pieces, repairing the tops of the falling objects, removing annular barriers of the falling objects (including mud sand, cement blocks, small pieces, setting slips and the like), standardizing the outer diameter of the falling objects, relieving or partially relieving the blocking points of the falling objects, selecting a cylinder with corresponding length according to the length of the falling objects and different well conditions, not only can sleeve and mill the cylindrical falling objects with short and thick shapes, such as small pieces, bridge plugs, releasing packers and the like, which are integrally unblocked, but also can grab and drag the rod-shaped falling objects with long shapes, such as the blocked oil pipes, drill pipes and drill collars, which are not or cannot be integrally unblocked, and can utilize the grabbing and fishing function of the slips to apply torque to the pipe columns to carry out back-off fishing, and drag out part of the oil pipes or the drill pipes and the drill collars while drilling, thereby realizing the next milling and fishing operations.

2. The bowl-shaped concave bottom type milling head is simple in structure, other parts can be repeatedly used except that the bowl-shaped concave bottom type milling head is a wearing part, the variable diameter function of the split slips and the grinding function of the bowl-shaped concave bottom type milling head can be used for milling and salvaging junks in a certain size range, particularly short and thick junks with unknown types of structures are drilled, the adaptability is high, the construction efficiency is high, the labor intensity is low, and convenience is brought during use.

Drawings

FIG. 1 is a schematic cross-sectional view of a concave bottom type overshot for fishing well junk.

FIG. 2 is a schematic cross-sectional view of a bowl-shaped concave bottom type casing cutter head of the present utility model for fishing well junk.

In the figure: 1. an upper joint; 3. a cylinder; 4. a baffle ring; 5. a slip; 6. an upper taper hole; 7. bowl-shaped concave bottom type milling head; 8. a lower taper hole; 9. split slips.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

As shown in fig. 1-2, the concave bottom type milling slip socket for fishing objects falling into a well comprises an upper joint 1, a cylinder body 3, a baffle ring 4, slips 5 and a bowl-shaped concave bottom type milling head 7, wherein the bottom of the upper joint 1 is in threaded connection with the cylinder body 3, the length of the cylinder body 3 is 0.2-0.5 m longer than that of the objects to be fished, the bottom of the cylinder body 3 is in threaded connection with the bowl-shaped concave bottom type milling head 7, the baffle ring 4 is placed at the threaded connection position of the bowl-shaped concave bottom type milling head 7 and the slips 5, the baffle ring 4 is screwed and fixed by threads between the bowl-shaped concave bottom type milling head 7 and the slips 5, an upper taper hole 6 with a large upper part and a small lower part is formed in the bowl-shaped concave bottom type milling head 7, the slips 5 is positioned in the upper taper hole 6, and a lower taper hole 8 is formed in the bottom of the bowl-shaped concave bottom type milling head 7; the milling tool comprises a non-returnable tool which combines the functions of milling, gathering and salvaging and salvages from the outer wall of a falling object, wherein the upper end of an upper joint 1 is detachably connected with a pipe column, the lower end of the upper joint is connected with a cylinder 3, the lower end of the cylinder 3 is connected with a bowl-shaped concave bottom milling head 7, the bowl-shaped concave bottom milling head 7 is prefabricated, the prefabricated bowl-shaped concave bottom milling head 7 is of an integral structure, a conical hole below the bowl-shaped concave bottom surface is arranged to be a concave angle of beta=5-30 degrees, when the tool works in an open hole shaft, wear-resistant materials are welded in three directions of a radial outer edge, the bottom and an inner cavity, the bottom and the inner direction are cut and grinded, and the radial outer edge has a diameter-keeping effect; when the sleeve is operated in, the arranged radial outer edge wear-resistant material does not generate a blade, so that the sleeve is prevented from being damaged.

A movable space for moving up and down, which is 1.5 times the length of the slip 5, is reserved between the baffle ring 4 and the slip 5.

The center of the baffle ring 4 is provided with a center through hole with the inner diameter larger than that of the bowl-shaped concave bottom type milling head 7, the center through hole is larger than that of the bowl-shaped concave bottom type milling head 7, long falling objects can pass through conveniently and are stored in the cylinder body 3, the set center through hole is smaller than the outer diameter of the slips 5, the slips 4 are prevented from further upward channeling, the inner cavity of the bowl-shaped concave bottom type milling head 7 is provided with an upper taper hole 6 with the upper part being larger than the lower part, the taper alpha=30-45 degrees, the bowl-shaped concave bottom type milling head 9 or fragments fall objects are guided and supported, a tool series is built, and the slips are conveniently used according to the change and selection of well conditions and the structural size of the falling objects and the inner diameter of a well hole.

The slips 5 are composed of two groups of split slips 9, a step is arranged between the split slips 9 to be mutually overlapped, the upper section forms a circular tube shape after the split slips 9 are folded, the lower section forms a cone shape, the upper section and the lower section do not misplace when being outwards stretched, the upper section and the lower section synchronously move and are not separated, the outer conical surface of the lower section is matched with the upper conical hole 6, the taper alpha=30-45 degrees is provided with inverted sawtooth buckling slip teeth, the slip teeth are hard and sharp after heat treatment, and falling objects are easy to enter and difficult to exit.

The top is provided with the standard screw thread that is used for outside tubular column threaded connection in the top, and top 1 is through being provided with standard threaded connection on the tubular column, uses with drilling rod, oil pipe and other instrument cooperation, forms the cover and mills salvage tubular column.

In addition, the utility model relates to a concave bottom type milling slip socket for salvaging objects in a well, which is used for being matched with a right-hand drill rod, a left-hand drill rod, an oil pipe and other tools to form a milling salvaging pipe column in the process of drilling or underground operation of an oil-gas field, circulates well washing liquid into the well, slowly rotates and lowers the milling salvaging pipe column, performs milling salvaging from the outer wall of a slender rod-shaped object such as a short and thick cylindrical object or a pipe, a rod and the like, can realize two operations of milling and salvaging of the next pipe column, is used for salvaging objects such as small objects in the well, the cylindrical object, the tubular object and the like, the cylindrical object or the like are gradually put into the inner cavity of a bowl-shaped concave bottom type milling head 7 after the top of the standard object is repaired by a ground drilling machine in construction, the split slips 5 are pushed upwards to separate from the upper taper hole 6 and gradually separated, the drift diameter is enlarged, the falling objects enter the inner cavity of the slips 5, the retainer ring 4 prevents the slips 5 from further ascending, the retainer ring 4 with larger drift diameter allows columnar and fragment falling objects to pass upwards and store in the cylinder 3, under the action of gravity, the slips 5 or the fragment falling objects hold the falling objects, the initial clamping force is given to the falling objects, the bowl-shaped concave bottom milling head 7 in rotation cuts or grinds and cleans the barriers of the annular space of the outer wall of the falling objects and the inner wall of the sleeve until the clamping point is released or partially released, or the designed well depth is reached, after finishing milling operation, the pipe string is lifted, the slips 5 are downwards moved relative to the cylinder 3 under the action of gravity, the cone of the lower section is attached to the upper taper surface 6, the radial clamping force is generated by the guide support slips 5 or the fragment falling objects, the falling objects are clamped, the falling objects can be fished out due to the drift diameter changing capability of the slips 5, therefore, when the slips 5 with one size are matched with the bowl-shaped concave bottom type milling head 7, the slips 5 with the corresponding sizes and the bowl-shaped concave bottom type milling head 7 can be replaced for falling objects with different sizes, a milling and salvaging range is reserved, the bowl-shaped concave bottom type milling head 7 is used for cutting unstable falling objects of small grinding pieces and the outer edge of the top of other broken falling objects, the falling objects can be covered, the falling objects are forced to be gathered in the cutting range, fragments are gathered and squeezed into the inner cavity of a tool, drill cuttings are taken out of a shaft by flushing fluid, the slips 5 can be omitted in construction, and the falling objects are blocked by accumulating the fragments of the falling objects entering the inner cavity of the fishing cylinder at the taper hole of the bowl-shaped concave bottom type milling head 7, and the drill is lifted and fished out.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (5)

1. The utility model provides a concave bottom formula cover mills slips and drags for a section of thick bamboo for salvaging well internal junk, includes top connection (1), barrel (3), keeps off ring (4), slips (5) and bowl form concave bottom formula cover cutter head (7), its characterized in that, top connection (1) bottom threaded connection has barrel (3), barrel (3) bottom threaded connection has bowl form concave bottom formula cover cutter head (7), keep off ring (4) have been placed in bowl form concave bottom formula cover cutter head (7) and slips (5) threaded connection department, and keep off ring (4) receive bowl form concave bottom formula cover cutter head (7) and slips (5) between the screw thread screw up fixedly, upper taper hole (6) big-end-down have been seted up in bowl form concave bottom formula cover cutter head (7), slips (5) are located upper taper hole (6), lower taper hole (8) have been seted up in bowl form concave bottom formula cover cutter head (7).

2. A concave bottom type casing milling slip socket for fishing well junk according to claim 1, wherein: a movable space for moving up and down, which is 1.5 times the length of the slip (5), is reserved between the baffle ring (4) and the slip (5).

3. A concave bottom type casing milling slip socket for fishing well junk according to claim 1, wherein: the center of the baffle ring (4) is provided with a central through hole with the inner diameter larger than that of the bowl-shaped concave bottom milling head (7).

4. A concave bottom type casing milling slip socket for fishing well junk according to claim 1, wherein: the slip (5) is composed of two groups of split slips (9), a step is arranged between the split slips (9) to be mutually overlapped, and after the split slips (9) are folded, the upper section forms a circular tube shape and the lower section forms a cone shape.

5. A concave bottom type casing milling slip socket for fishing well junk according to claim 1, wherein: the top is provided with the standard screw thread that is used for outside tubular column threaded connection in top connection (1).

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