RU2223382C1 - Anchor - Google Patents

Abstract

FIELD: equipment for driving, testing and operation of holes. SUBSTANCE: invention is intended for setting of various installations at depth of well specified at will. Anchor includes rod, cone with seizing threading dies, synchronizer of movement of dies, body of lock with collet in the form of springy tabs, friction clutch with spring-loaded straps coupled rigidly to body of lock. Outer surface of rod has right-hand thread, collet is put on rod inside body of lock. Thrust right-hand thread engaging thread of rod is cut in inner surface of ends of springy tabs. Groove in which shock-absorbing rings to adjust stiffness of pressing of springy tabs is made in outer surface of tabs. Collet is fixed against longitudinal movement by internal protrusion of body of lock and against turning with reference to body of lock and bending of springy tabs by plates spline-joined to tabs of collet made fast to body of lock. EFFECT: enhanced operational reliability and simplified design of anchor. 2 dwg

Description

The invention relates to techniques for wiring, testing and operating wells and is intended to install various devices at an arbitrarily specified depth of the well. The most important area of application of the invention is the installation of packers when testing wells using formation testers on pipes. The main purpose of the device is to provide in the process of testing the fixing of downhole equipment to the walls of the well.

Known anchor (ed. St. No. 1559108, class Å 21 B 33/12, 04/23/90, BI No. 15), lowered on a pipe string, including a hollow rod connected with a cone and a lower sub, the die is made with a shank, a shank the die has a persistent thread, a hollow rod connected to the cone and the lower sub, and having a thread on the outer surface that meets the thread on the protrusion of the shank. The disadvantage of this device is

- the die and the shank acting as a stopper are made as a single unit, and therefore it is difficult to control the rigidity of pressing the shank against the stem;

- the complexity of manufacturing this site;

- in the event of failure of one of the elements of the die or shank, the replacement of the entire element is necessary, which leads to the high cost of the anchor.

An anchor is also known (aut. St. No. 901467, class Å 21 V 23/06, 01/30/82, BI No. 4) and (aut. St. No. 994684, class Å 21 V 23/06, 08/07/83, BI No. 5, additional to ed. St. No. 901467), taken as a prototype. The known solution comprises a cone with dies, a synchronizer for moving the dies, a rod with a protrusion and an annular groove, a friction clutch, a lock case, on the inner surface of which a screw thread is made, a spring-loaded latch, and a slider connected to the rod interacting with the latch and the protrusion, and the slider is made in in the form of a sleeve covering the rod, on which, using three pairs of through grooves, two groups of spring petals are formed, symmetrically located relative to the axis of the rod, on the outer surface of the ends of one of the pairs of petals in constituting a sector, a threaded thread is made, corresponding to the thread of the lock case.

The disadvantages of this design include the following

- insufficient rigidity and strength of the elastic elements of the slider and the impossibility of its regulation;

- the difficulty of manufacturing slider slots;

- the indefinite position of the slider relative to the castle body;

- weakening of the strength of the rod due to the annular groove;

- the complexity of the assembly.

The objective of the invention is the creation of an anchor lock that provides stable engagement of the tool on the well walls, while increasing the reliability of the device during the formation testing, as well as simplifying the design and manufacturing technology.

The task is achieved in that in the anchor containing the rod, the cone with jamming dies, a synchronizer for moving the dies, the lock case with a collet in the form of spring petals, the friction clutch with spring-loaded slats, rigidly connected to the lock case, in contrast to the prototype on the outer surface of the rod a thread, a collet is mounted on the rod inside the lock case, on the inner surface of the ends of the spring petals, a right thrust thread is made, which is meshed with the stem thread, on the outer surface of the petals there is a groove in which shock-absorbing rings are installed to regulate the stiffness of pressing the spring petals, the collet is fixed from longitudinal displacements by the internal protrusion of the lock case, and from scrolling relative to the lock case and bending of the spring petals, plates fixed in the splined connection with the lock case petals collet.

New features of the claimed anchor lock are:

- on the outer surface of the rod made right thrust thread;

- the position of the collet inside the lock case is fixed and determined by the internal protrusion of the case, on the inner side of the spring tabs of the collet there is a right thrust thread engaged with the rod;

- the rigidity of pressing the spring petals of the collet to the rod allows you to adjust the shock absorption rings mounted on the outer surface of the collet;

- from scrolling the collet and breaking the spring petals, a spline connection is provided in the form of lock housing plates installed in the slot of the collet.

The applicant is not aware of technical solutions that distinguish the claimed solution from the prototype. Thus, we can conclude that the inventive device for testing formations meets the criteria of the invention of “Novelty” and “Inventive step”.

The invention is represented by drawings: in figure 1 - an anchor; figure 2 - scan collet.

The anchor contains a rod 1, on the outer surface of which a right thrust thread is made, a sleeve 2 is rigidly placed on the upper end of the rod 1, and a nipple 3 is located on the lower end. Locking screws 4, 5 prevent their unscrewing. On the outer surface of the rod 1, a cone 6 is located between the stop collar and the end face of the coupling 2. The dies 7, jamming, are movably mounted on the inclined guides of the groove-protrusion of the dovetail cone 6. To ensure a fixed position of the jamming dies 7, the Anchor contains the rod 1, on the outer surface of which the right thrust thread is made, at the upper end of the rod 1, the coupling 2 is rigidly placed, and at the lower - the nipple 3. relative to the cone 6 and maintaining a given stroke of the dies, the latter are equipped with lateral stops interacting with the protrusions of the cone 6. The dies 7, jamming, are connected to the synchronizers 8 of moving the dies with T-grooves, allowing the dies to move in the radial direction, and to transmit axial forces to the walls of the casing.

The holder 9 is connected by T-grooves with the synchronizers 8 of the movement of the dies for synchronous movement of the jamming dies 7 relative to the cone 6. The locking screws 10 are used to fix the synchronizers 8 of the movement of the dies in the holder 9. Using a clamp 11, which has a clearance B, nut 12 and a bolt 13, the flanges of the holder 9 and the holder of the clutch 14 are fixed, the axial forces are transmitted through a group of parts for synchronous movement and jamming of the dice 7. The clutch consists of a holder of the clutch 14, in the grooves of which are radially spaced pressed by the springs 15 of the strap 16, fixed from falling out by the stops 17 and 18. The stop 17 is rigidly connected to the friction clutch, and fixed from unscrewing by the locking screw 19. The springs 15 are placed in the holes of the bars 16 with preliminary compression, which ensures constant contact of the bars 16 with the walls of the column or wells with sufficient force when controlling the anchor during the vertical movement of the rod 1 to transfer the anchor from the transport position to the working position and from the worker to the transport one. Below the clutch 14 on the rod 1, there is an anchor lock consisting of a collet 20 and a lock body 21. The collet 20, mounted on the rod 1, in the form of an elastic sleeve, and located inside the lock body 21, is fixed from free movement due to the protrusion A of the lock case 21. The made longitudinal slots on the collet form elastic spring petals, at the ends of which, on the inner surface, a right thrust thread is made, which is meshed with the right thrust thread of the rod 1. The ends of the elastic petals are pressed against the surface of the rod, while the force their pressing is regulated by depreciation rings 22 mounted in a groove made on the outer surface of the petals. To give greater rigidity to the spring petals of the collet 20, plates B are rigidly fixed to the lock case 21, which are in slotted engagement with the petals and protect them from bending under high torque loads during the control of the anchor, as well as from twisting the collet 20 relative to the lock case 21. Lock case 21, connected by a threaded connection to the clutch 14, is protected from unwinding by the locking screws 23.

An anchor works as follows.

The anchor on the pipe string is lowered into the well in the transport position. In this case, the jamming dies 7 are in the recessed position, and the elastic petals of the collet 20 are engaged with the thread of the rod 1. When the armature is moved in the well, the friction forces of the straps 16 against its walls cannot bring the anchor out of the transport position, as this is prevented by the threaded engagement of the collet 20 with a rod 1. After reaching a predetermined immersion depth of the tool, the pipe, and with them the rod 1, is rotated clockwise, while the rod, moving down, disengages from the collet 20. Free movement of the rod 1 relative on the clutch 14 when disengaging from the collet 20, possibly due to the existing backlash B. Until the entire backlash is selected, jammed dies 7 in the working position are not displayed. The friction clutch 14 and the lock housing 21 under the action of the adhesion forces of the strips 16 with the wall of the well remain stationary. With further lowering of the pipe string, coupling 2, rigidly connected with the rod 1 and cone 6 down, the jamming dies 7 extend along the guides of the cone 6 in the radial direction until they are completely in contact and jammed with the borehole wall. At this, the transfer of the anchor to the working position ends.

The anchor is switched from the working position to the transport one by lifting the sleeve 2, rod 1 and cone 6. Since the friction clutch 14 and the lock body 21 remain stationary, the collet with its petals engages in the thread of the rod 1. When the tool is further raised, the jamming dies 7 disengage from the column wells and are displaced along the slots of the cone 6 down, by the magnitude of the stroke. The anchor goes into transport position.

To transfer the anchor back to its working position, the cycle repeats.

The proposed technical solution has significant differences compared with the analogue and prototype, namely

- the collet is made in the form of a sleeve, with longitudinal slots forming spring petals, and is rigidly fixed in the lock case from longitudinal movements and scrolling;

- the collet is engaged with the rod, thanks to a special right thrust thread made on the rod and collet;

- the spring-loaded elastic petals of the collet are protected from bending and kink by the plates of the lock case, and the shock-absorbing rings regulate the stiffness of pressing the spring petals to the rod.

As a result, the reliability of the lock and the entire anchor as a whole is increased, at the same time, the design of the castle is simplified, the manufacture of a collet is simplified. In addition, the reliability of fixing the anchor in the transport position is increased, which allows to increase the speed of descent of the anchor into the well.

All this reduces the duration of well testing and saves material and labor resources by reducing the number of unsuccessful runs of test equipment into the well.

Claims (1)

An anchor containing a rod, a cone with jamming dies, a synchronizer for moving the dies, a lock case with a collet in the form of spring petals, a friction clutch with spring-loaded slats, rigidly connected to the lock case, characterized in that the right-hand thread is made on the outer surface of the rod, the collet is mounted on the rod inside the lock case, on the inner surface of the ends of the spring petals, a right thrust thread is made, which is meshed with the stem thread, on the outer surface of the petals there is a groove in which shock-absorbing rings to regulate the stiffness of pressing the spring petals, and the collet is fixed from longitudinal movements by the inner protrusion of the lock case, and from scrolling relative to the lock case and bending of the spring petals by plates rigidly attached to the lock case located in the splined connection with the collet petals.

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