SU33494A1 - Casing unscrewing device from a specific point in a well bore - Google Patents

Description

The proposed apparatus for unscrewing casing helical pipes from a specifically designated column location in boreholes consists of two separate rods, with the end of the upper stem running along the thread in the drilled slot of the thickened part of the lower stem.

The latter, by means of bevel and cylindrical gears, a coupling, a screw, conical bodies (wedges), the planer ring bars, connects the screwable column with a subsequent one and creates a stationary state of the turnable column below the mill.

The upper rod, by means of another wedge, semicircular dies, cams, a ring and a tapered part, produces the unscrewing of the column from the coupling above the router.

FIG. Figures 1, 1 and 1 of the schematic drawing show a general view and vertical sections of a casing unscrewing device; FIG. 2 is a cross-section of it along the line LB in FIG. 1 and FIG. 3 is a cross-section of it along the line BG in FIG. one.

The apparatus consists of three parts: the lower round stem /, having a round thickening a at its upper end, in which a round hole is drilled, having a right-hand thread; top

a circular rod 2 having in the lower part a right-handed thread, with which the rod 2 enters the hole of the rod thickening / and can be lowered and raised in the thread on it; worn loosely on the rod 2, a lantern 3, in which the rod can rotate freely, and the lamp itself sits tight in an unscrewing column, thanks to the retractable lantern strips on strong springs.

On rod 2, above lantern 3, there is a flange g, from pressing of which the lantern descends tightly into the well. The lantern 3 is connected to the bottom by hinges through its hooks 4 with the corresponding four hooks on four semi-circular dies 5, which have an external blunt thread for gripping the casing screw pipes when unscrewing them.

The lower rod 7 (Fig. 1) has a head b at its lower end, above which a guide lamp 7 is placed freely on the rod and does not rotate as the rod 7 rotates. Thank you to the side rollers on the lantern bars. A conic gear 8 is tightly mounted over the lantern 7 on the rod 8. The rod 7 with gear 8 with a non-rotating lantern 7 rotates on the balls.

In the clutch with gear S, on the left side of the rod 7 in the vertical

a conic gear; n 9 abutting on gear 8 and supported by a yoke, the bent ends of which fit into the corresponding concentric grooves on both sides of gear 9, which can rotate when the yoke is fixed) W. The other end of the latter is fixed in jumpers // and / 2, covering the shields 7 in its sharpening. When the stem 7 is rotated, these bridges do not rotate due to the presence at their ends of the rollers engaging the casing. Between the jumpers, // and / 2, the cylindrical gear 75 is tightly mounted on the rod, which is in engagement with another cylindrical gear / - # (Fig. 2), into which the coupling / 5 is fitted tightly, held in place by the jumpers // and / 2 cover it in sharpening and it can rotate with gear J4 in its place in the girths of these non-rotating jumpers. Coupling / 5 sn bnsen in the vertical direction through the hole with the right thread, through which passes the screw / b, having a movement up and down along the marked thread while rotating the coupling / 5 in its place. The end of the screw J6 is connected to the conical body 77 and, when the screw 76 moves up and down, this conical body (wedge) moves in the same direction. A wedge 77 is connected to the wedge 77 by means of a spike (dovetail), which moves progressively in a horizontal direction as the wedge / 7 moves. With wedge / 5 connected two strips / P (Fig. 3), running on both sides of the rod 7, in the bore part of it. Planks 7P at the other end, through the ring 20, are connected to the router 27; when the latter rotates in the ring, the bars 7P do not rotate, but progressively, in their constant position relative to the rod /, move with the conical body J8, forward-while rotating the rods to the right and backward-while rotating the rods to the left.

The router 2 / passes through the conical pin on the key and can move, rotating with this gear, progressively in the horizontal direction.

Above the jumpers 7 / and 72, a free guide lamp 22 is put on the rod.

(Fig. 1) of the same design as the lower lamp 7. Above the lantern 22, the rod 7 passes into a round thickened part a, on top of which there are two semi-circular discs 23 mounted on the sliders, which, in the free position under the action of the springs 24, move away from the center of the thickened parts.

The upper round rod 2, in its lower part, has a stepped view with an outer right thread, the lower part 25 and the thickened part 26 enters the corresponding hole in the thread in the thickened part a of the rod 7.

Above the pin 2, a boring is made on which a circular disk 27 is put on, which does not rotate with the rod 2, due to the presence of end rollers on the springs abutting on the casing screw pipes. Above the disk 27, the rod 2 is provided with a conical thickening 28 with an outer cone left-hand thread. Further, the rod 2 has the same circular cross section through which the upper lamp 5 passes (Fig. 1) and in which the rod 2 freely rotates. The stem 2, above the bulge 28, is loosely fitted with a tapered quadrilateral wedge 29 supported on the stem by two collars b and c. Along the sides of the wedge 29 are four semi-circular dies 5, which do not rotate during rotation of the rods 7 and 2 and are associated with the wedge 29 by a thorn (dovetail). When lifting and lowering the stem 2, the wedge 29 can go up and down between the dies 5 and, accordingly, to tear them apart, pressing them against the casing helical pipes, or moving them away. Above the thickened part 28, the cylindrical ring 30, which has an inner tapered left-hand thread, is fitted loosely on the brush 2, respectively, is cut into the thickened part 28, and is supported by four bolts. 57 on the springs fixed in the disk 27. From the dies 5 there are four curved cams 52, which, with their round ends, fit tightly into the corresponding external holes of the cylindrical ring 30 and can move in them according to the movement of the dies 5.

When working with the proposed apparatus, it is lowered into the well on thick rods and, stopped at the desired depth, they begin to rotate to the right over the wellhead.

The lower protrusions of the thickened part 26 (Fig. 1) of the rod 2 are seated in the grooves made on the surface of the semicircular disks 23, as a result of which the lower end of the rod 2 cannot move downward in the hole of the thickened part of rod 7 and therefore both rods 7 and 2 rotate together right.

The rotation of the two rods is transmitted directly through bevel gears 8 and 9 (Fig. 1). 3 also through spur gears 75 and 7, through sleeve 75, screw 76, conical bodies 77 and 8, through strips J9 and ring 20 to router 27, rotating very slowly with gear R, moves to the wall of the roll-away column and mills a two-inch hole in the screw-down column, passes further to the next pipe string, hooks into this column and enters the wall of this column by two millimeters. The router 27 is a whole body, with only 10 millimeters of empty space from the end of the teeth. The milling cutter of the turning column will occupy 8 millimeters in the mill, therefore, the mill can only enter 2 millimeters into the subsequent column and, with further rotation of the apparatus, the mill 27 cannot move further.

Thus, the roll-off pipe string, through the router 27, is associated with the subsequent column, and in this place a stationary state is created when the top of the column is unscrewed. When the rods 7 and 2 rotate, the ratchet is also rotated to the right. The dog 34 jumps off the ratchet teeth. When rotating the rods to the left, the dog 34 grabs the ratchet bar 33 and prevents the return movement of the rods 7 and 2 to the left.

When the router 27 reaches the next column and crashes into it, the work of the rod 7 stops and the dog 34 grabs the ratchet bar 33. They begin to rotate the rod 2 to the left. The rod 2 in the lower part 25 and 26 (Fig. 1) begins to open and lift upwards. At this very time, two semicircular discs 23 are released, which, under the action of the spring 24, move back from the center of the thickened part a. Thanks to the flange b and in on the stock 2,

with the rod 2, a wedge 29 begins to lift, with which four semi-circular dies 5 are pushed in, pressed against the casing screw-type, unscrewable tubes. At this very time, the tapered thickening 28 on the rod 2 begins to enter the thread into the tapered ring 30. When the part 28 enters the ring 30, the wedge 29 presses the plates 5 to the helical pipes and, with further rotation of the rod, 2 casing pipes connected to the rod, through the semicircular dies 5, cams 32, ring 30 and part 28 of stem 2, begin to unscrew from sleeve 35. When the entire thread of the sleeve has turned away, the rope 36 associated with the circular disk 27 and with the pawl 34 due to the lifting of the disk 27 is stretched, t There is no dog 34 up, lift and withdraw it from communication with the ratchet 33, and then then it becomes possible to turn the stem 7 to the left.

When the column is unscrewed from the sleeve 35 and the pawl 34 is removed from the connection with the ratchet J5, the output of the lower part of the rod 2 from the hole of the thickened part of the rod 7 stops and, with further rotation of the apparatus to the left, both rods begin to rotate together to the left. With this rotation, the router 27 goes out of its place in the same way in which he milled the pipe string. When the router 27 takes its original position, raise the turned column with the device. To simplify the work, you can pull out the column to be unscrewed, leaving 20 meters and unscrewing at these 20 meters.

The movement of the lower end of the stem 2 in the thread of the thickened part a of the stem 7 is delayed as follows. In the rod 7 from the base of the drilled site in the thickened part and the hole is drilled down in its center. Then, through cuts 37 are made on both sides of this part of the stem 7 at an angle of 180. At the lower end of the stem 2 a twig 38 with a head is arranged on the balls, passing down into the drilled part of the stem 7. At the lower end of the twig 38 there is a fixed wedge 39, ends which protrudes through slots 37. When the stem 2 turns to the left, the twig 38 does not rotate, as the stem 7 does not rotate either. The rotation of the stem 2 to the left occurs

freely and not transmitted to rod 38, due to the ball joint under the head of the rod. When the rod 2, when rotated to the left, rises up, its lower end is not behind the rod 38, and when the wedge 39, lifting with the rod 38 along the slots 37, reaches the end of the slots with its ends, the proper movement of the rod 2 stops and begins to rotate to the left are both rods / and 2. At this rotation, the milling cutter 21 comes out of its place and, as was said above, the column with the apparatus is turned away and rises from the well.

This terminates the entire apparatus operation.

When constructing the proposed apparatus, the case is provided (which, according to the calculation, should not be X when the rod 2 lifts and the wedge 2R rotate to the left. Open the semi-circular dies 5, pressing them to the casing, but with further rotation to the left, the column does not turn away from the coupling 35 thread. During the lifting of the stem 2, the semicircular discs 23 are released and move away from the center of the thickened part and the stem 7, under the action of the springs 24. Then the rotation of the stem 2 to the left is stopped and start to rotate it to the right. a spindle 7, part 25, goes down in the corresponding hole below; a twig 38 with a wedge 39 also goes down. The latter presses the circular disk 40 connected to the rod 7, thrown over the sprocket 41, with the dog 34. From pushing the wedge 39 onto the disk 40, the latter descends

on rod 7, and dog 34 is released and loses connection with ratchet J5. Wedge5R ,. Descending down slots 57, it enters lock 42 and is then delayed. At this time, the rotation of the apparatus to the right is stopped and they begin to rotate it to the left.

Due to the delay of the wedge 55 in the lock 42 when the apparatus rotates to the left, both rods 7 and 2 rotate together, the router 27 goes back the same way. in which way he milled pipes, taking his ne, initial position, and the apparatus was removed from the well. In such cases, in these wells, during the secondary descent of the apparatus for unscrewing the column, one should try to unscrew the column from the next coupling.

The subject matter of the invention.

An apparatus for unscrewing the casing with a specifically designated column in the borehole, characterized in that it consists of two separate rods 7 and 2, of which the rod 7 serves to hold the lower part of the unscrewing pipe with the mill prior to the casing, which is driven by the rotation of the rod 7 through gears 5, 9, 13 ... 20, and the rod 2, the lower end of which has a stroke along the thread in the drilled nest of the extended upper part of the rod 7, serves for self-fixing in the unscrewing column by means of a wedge 29, half-shell glyh dies 5, cam 32, ring 30 and the cone part 2 and a rod 28 for loosening-column on the left-thread with the sleeve 35 above the router.