RU1803533C - Gear for suspension of sunk casing strings - Google Patents

Abstract

FIELD: mining. SUBSTANCE: invention relates to mining, in particular, to drilling and fastening of wells, to devices for cementing casing strings. The flush casing suspension device comprises a nipple and a disconnect clutch supporting a pipe string and a suspension assembly with an emphasis on a previous casing clutch. Spiral centering dies are rigidly mounted on the outer surface of the disconnect clutch. Spiral bars are made on the inner surface of the coupling of the previous casing. The height of the dies is equal to the length of the slats. The circular sector covered by spiral dies is larger than the splined gap between the slats. 3 ill.

Description

The invention relates to the mining industry, and more specifically to drilling and fastening of wells, in particular to cementing devices for casing strings.

The purpose of the invention is to increase the reliability of the flap of the supporting column from the countersunk column.

On Fig, 1 shows a device, a General view; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 is a scan of the inner surface of the sleeve of the previous casing stating the position of the slats and dies at the moment of engagement;

The device consists of a nipple 1 and a clutch 2 of a disconnector with a left-hand thread 3 (Fig. 1), the Disconnector has cementing holes aligned with a pin 4, side holes 5, below and above which are located between the nipple 1 and the clutch 2

O-rings 6, and circulation axial channels 7 in the nipple 1. To the nipple 1 of the disconnector, at the top, a support column 8 is connected, and at the bottom, a concentric pipe 9 with a perforated bottom 10, in the extreme upper position of which the piston 12 is mounted with shear elements 11. C a sleeve 13 is connected to the disconnector clutch 2, and above the cementing holes 5, spiral centering dies 14 are rigidly connected and the annular space sealant housing 15 is fixed with a stop 16 and a sealing element from a set of rings 17 with a hemispherical with a sealing surface and separated by metal rings 18, which is held on top by a guide funnel 19, The outer diameter of the rings 17 of the sealant is slightly larger than the inner

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the diameter of the previous casing string 20, equipped with a sleeve 21 with rigidly connected strips 22 having double-sided guide bevels 23. The strips 22 are located on the inner forming sleeve 21 with the possibility of passing the cone of the drill bit under the collar 13. Moreover, with equal height D dies 14 of the clutch 2 of the disconnector and the length On the strips 22 of the clutch 21 of the previous casing 20, the circular sector U covered by the spiral dies 14 is larger than the spline clearance LZ between the strips 22 (Fig. 2 and 3).

 A device for hanging a countersunk column operates as follows. When lowering the previous casing string 20, a sleeve 21 with planks 22 is installed in the planned place for the subsequent suspension of the collar string, the number of which corresponds to the number of cutter bits designed to deepen the well under the countersink 13.

During tripping operations (STR), the bit cutters by the bevels 23 are directed into the spline gap between the strips 22, which extend in the space between the paws of the bit. The width and size of the protrusion of the strips 22 inside the previous casing string 20 is limited by the passage sizes between the cutters and the paws of the bit, but this is quite sufficient for subsequent engagement. When setting the magnitude of the protrusion of the straps 22, it is also necessary to take into account the outer diameter of the drilling tool and the collar of the countersunk string 13.

When the collar 13 is suspended on the previous casing 20, the spiral centering dies 14, partially lowering into the splined gap between the laths 22, abut against the tops of the latter (Fig. 3). The spiral dies 14 with the lower end surface also abut against the lateral surfaces of the strips 22, thereby axial and circular fixation is carried out

the clutch 2 of the disconnector relative to the clutch 21 of the previous casing string 20. Upon completion of cementing, due to the rotation of the support string 8 to the right, the stud 4 is cut off and a flap occurs

left thread 3 disconnector. Since the spiral dies 14 abut against the lateral surfaces of the planks 22, turning the countersunk column 13 is not possible even with significant torques.

Claims (1)

The claims Concealed casing hanger device including a nipple and a disconnect clutch supporting a pipe string and a suspension unit with an emphasis on the coupling of the previous casing string, characterized in that, in order to increase the reliability of the turn of the pipe support string from the countersunk casing string, on the outer surface of the coupling spiral centering dies are rigidly mounted on the disconnector, and spiral bars are made on the inner surface of the coupling of the previous casing, the height of the dies being equal to the length planks, and the circular sector covered by spiral dies is larger than the spline gap between the planks. "-. F v 14 $ & gg V 4 4, W 25 S