SU1406349A1 - Rotary hanger for running and cementing flush casing - Google Patents

Abstract

The invention relates to a technique of fastening wells with hidden columns of casing and allows for the suspension of the suspension to be separated from the secret column in case of failure of the suspension plug. The suspension includes a clutch 1 with a protrusion 20 on the inner surface, a carrier pipe 2 located in its cavity, with a tongue 3 and a supporting sub 4, with a 5 G - 13 j stopper overlying side openings 7 of the pipe 2 2 4 lif figure 1

Description

and the sleeve 6, interacting with the coupling 1 left-handed thread. Their non-circular sections are coaxial with each other and non-circular section of pipe 2. The locking suspension assembly has embedded elements located in the slots of the support sub and protrusion 20. The suspension plug 14 of the suspension has an adapter 15 connected by middle pins to the sub 4, grooves 18 are filled in the form of grooves on the lower end of the sub, and the grooves of the projection 20 - in

as through longitudinal slots. The adapter 15 has an annular protrusion 21. After cementing, the rotation of the pipe 2 begins. The pipe 2 transfers the rotation to the sleeve 6 and unscrews it from the coupling 1. The circulation of the well flushing fluid is restored. In case of disconnection, the plug 14 releases the lock of the left thread, lifts it to the surface of the pipe 2 and remove the plug 5, 6 Il.

one

The invention relates to the fastening of wells by blind casing strings, namely rotating suspensions.

The purpose of the invention is to provide a suspension column from the suspension connection in the event of the suspension plug not releasing.

Figure 1 shows the proposed suspension, screwed on the upper casing of the secret column before its descent into the well; Fig. 2 shows the same, after opening the side windows of the supporting pipe and releasing the suspension plug; fig. 3 - the same, after the descent of the carrier pipe canal to release the keys; figure 4 - section aa in figure 1; on fig.Z - section B-Bnafig.1 figure 6 - section bb In figure 1.

The rotating suspension consists of a coupling 1, in the cavity of which is located on the supporting pipe 2 with the bearing node 3 and the supporting sub 4. A plug 5 and a sleeve b, which overlaps the side windows 7 of the supporting pipe 2, are connected to the coupling 1 with the left thread. The sleeve 6 and the supporting pipe 2 at its upper position (see Figures 1 and 6) interact with each other with the possibility of axial movement, respectively, along the inner 8 and outer 9 surfaces congruent to each other, non-circular in cross section (see Fig. 6) . The plug 5 also has a non-circular cross section (see Fig. 5), the inner surface 10 of which is congruent to the outer surface 5.

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surface 9 of carrier tube 2. This allows rotation of the drill string to be transmitted through carrier tube 2 to sleeve 6 and plug 5.

Above the left thread on the sleeve 6 there are holes 11, which communicate the cavity of the carrier pipe 2 with the annulus, which eliminates the jamming of the left thread with solid phase or sludge. The upper part of the sleeve 6 is made circular in the form of an annular section between the supporting pipe 2 and the coupling 1. The middle part of the sleeve 6, located between its round and non-circular parts, is filled with an annular recess I2.

The carrier tube 2 is made with an annular groove 13 above its side windows 7. The annular groove 13 is located at such a height that, after opening the side windows 7, ensures that the circular part of the sleeve 6 is at the level of the annular groove 13 of the carrier pipe 2.

A suspension plug 14 with an adapter 15 fixed to the shear elements 16 is connected to the supporting sub 4 below. The hanging plug closes the locking assembly containing the inserts in the form of tongues 17 (the inserts can also be made in other shapes, for example in the form of balls). Mortgage elements are installed in the slots 18 of the support sub, made in the form of grooves at its lower end and the slots 19, the protrusion 20 of the coupling 1, made in the form of through 3, 14 longitudinal slots. Adapter

15, the suspension tube 14 has an annular protrusion 2.1 for interacting with the embedded elements 17 in the initial position.

The sleeve 6 and the plug 5 are installed in the sleeve 1 so that their non-circular sections are coaxial with one another, i.e. their projections onto the horizontal plane coincide. This makes it possible, while lowering the bridges of pipe 2, to simultaneously connect non-. circular sections of the carrier tube 2, bushings 6 and plugs 5 (see Fig. 3).

The tightness of the suspension is ensured by the presence of seals 22.

Rotating suspension works as follows.

In the process of lowering the secret column along the wellbore, narrowing or landing sites are worked out, which is ensured by the presence of a left-handed lock.

After the descent column has been lowered and the cement slurry has been injected, a separation plug (not shown) is inserted into the drill pipes and forced into the mud. In the process of pumping cement mortar and forcing it into the annulus, drill pipes with a secret column suspended on them constantly or periodically rotate and pace.

When planting separation tube in the suspension 14 increases the pressure on the wellhead. After reaching the calculated value, the destruction of the elements 16 occurs and both plugs begin to move along the secret column, ensuring reliable separation of the cement slurry and the squeezing fluid. After the suspension plug 14 has gone, the splines 17 due to the groove 18 in the form of grooves at the end, i.e. open from the bottom, fall out of the grooves 18 and the longitudinal slots 19 inside the column (see Fig.2). Therefore, since the suspension plug 14 leaves, the rotation of the drill pipe is stopped in order not to open the side windows 7 prematurely.

Upon further pumping of the squeeze fluid, the plugs move downward until they land on the retaining ring, as evidenced by pressure - stop at the end of cementing.

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Once

finished the cementing process, begin to rotate the drill pipe. The carrier pipe 2, with its non-circular part, transmits the torque to the sleeve 6 through its non-circular cross section (see Fig. 6) and unscrews it from the coupling 1. Circulation is restored through the open side windows 7 of the carrier pipe 2. From windows 7, the circulation goes through the annular recess 12, and in its upper part it divides into two streams: one goes through the annular groove 13, and the second goes through the apertures 11 to the annulus. A well was flushed to flush out the excessively high puffs 1 of the cement slurry. In order to make the leaching more complete and not sticking of the drill pipes, the latter constantly or periodically rotate during the RFQ.

In case of non-disconnected outboard

plugs 14 (for example, the separator plug is stuck in the drill pipe or has come into the suspended one, but its contact with the adapter 15 of the separation plug is leaking, or during non-cutting

elements 16) stop pumping the squeezing fluid and proceed to release the lock of the left thread. To do this, lower the supporting tube 2

all the way around its non-circular cross section

plug 5. When lowering down, the thrust sub 4 moves key 17 down along keyways 18 and 19. Once the keys 17 are completely lowered below sleeve 20 of coupling 1, they

fall down on the suspension plug 14 (see Fig.3). This is made possible by the fact that the annular protrusion 21 of the adapter 15 is no longer able to hold the keys 17, and they, deflected to the inner wall of the coupling 1, slide down. If necessary, at this moment it is possible to circulate through the opened side windows 7 and the channel formed due to the presence of an annular undercut 12 in the sleeve 6 and an annular groove 13 on the outer surface of the supporting pipe 2.

After the key 17 departs, the carrier tube 2 lifts the bearing 3 into the plug 5 until it stops. In this case, the side windows 7 of the carrier tube are sealed by the sleeve 6. Then, the squeezing fluid is resumed to be calculated to complete

displacing cement mortar from the standpipe (but leaving the cement cups of the required height) At the end of the injection of the squeezing fluid, rotating the drill pipes lifts sleeve 6 (since there are no dowels 17) and flush out the cement stock that has been injected too much. In this case, the possible rotation of the drill pipe, as described.

After the end of RPF, to disconnect the suspension from the secret column, the drill pipes together with the carrier pipe 2 are lowered so that the non-circular part of the carrier pipe goes inside the non-circular cross section of the stopper 5. Rotate the drill pipes to the right, the left stopper 5 is unscrewed from the coupling 1, thereby freeing joints with a secret column.

After lifting to the surface, the plug 5, the sleeve 6, the supporting pipe 2, the bearing assembly 3 and the supporting sub 4 will be removed.

Thanks to the proposed design of the rotating suspension, it is ensured that it is detached from the countersunk column in any emergency situations.

FIG. 2

Claims (1)

Rotating suspension for lowering and cementing a countersunk column including a collar with a protrusion on the inner surface, a carrier tube located in its cavity with a bearing unit and a supporting sub, mounted over them the side windows of the carrier tube are a plug and a sleeve, which can interact with the left-hand coupling, non-circular sections of which are aligned with each other and non-circular cross-section of the carrier tube, the locking assembly with the fixtures, located in the slots of the supporting sub and the coupling protrusion, the suspension plug with transition- : Nick connected with medium pins with The onopiaiM sub differs from the fact that, in order to ensure that the suspension is disconnected from the secret column in the event of the suspension plug not loosening, the grooves of the support sub are made in the form of grooves on its lower end, and the slots of the clutch protrusion are in the form of through longitudinal slots, the suspension cube sub has an annular protrusion for interactions with embedded elements in the initial position. W Bhz FIG. G5 b- s Fkg 5