SU810928A1 - Device for connecting casing sections - Google Patents

Description

one

The invention relates to a process tooling used during the descent and cementing of casing sections in the process of fixing oil and gas wells.

Arrangements are known for connecting casing sections, comprising a receiving hopper and a connecting pipe with a seal for hermetic joining of sections.

However, they have a significant drawback - the tightness of the connection of sections and the amount of pressure at which the tightness does not break, depend on the amount of unloading of the weight of the upper section to the bottom. This leads to the loss of stability of the sections of the upper section and cementing it in a curved position.

A device for connecting casing sections is known, comprising an entrainment funnel with a sealing surface and a connecting pipe with sealing rings and through radial holes arranged under them.

The drawback of the device is that at the distance between the through holes and the sealing rings in the gap between the pipe and the receiving funnel will accumulate and be sealed

abrasive, which will be applied on the sealing surface of the receiving funnel axial risks, which causes leakage of the connection sections of the casing strings.

The purpose of the invention is to increase the tightness of the connection of casing sections in an abrasive environment.

This goal is achieved by having an annular groove on the outer surface of the nozzle, the lower part of which is located at the location of the through radial holes, the nozzle being provided with a scraper made in the form of a ring and installed in the upper part of the annular groove.

FIG. 1 shows a general view of an apparatus for joining casing sections in section, in a transport position; on

FIG. 2 - device in the connected position of the sections; in fig. 3 - node I of FIG. one.

The device contains a receiving funnel 1 and a connecting pipe 2 with a scraper, made in the form of a ring 3 and sealing rings 4. The scraper and sealing rings are protected by the casing 5 from damage to the walls of the open hole during transportation through the well. From axial displacement, the housing is kept by shear tabs 6.

The ring 3, in contrast to the sealing rings 4, is located in the upper part of the annular groove 7, the lower part of which has. t through radial holes 8 for the release of abrasive particles from the compacted gap into the casing.

The receiving hopper below the sealing surface 9 has an end face 10 that mates with the inner surface of the left-hand thread of the disconnector.

The device works as follows.

Before lowering the upper section, its lower part is equipped with a connecting pipe 2. The section is lowered in the usual way.

When approaching the receiving hopper 1, which is fed into the well together with the previous section, the connecting pipe 2 is due to its conical direction inward into the receiving hopper. At the expense of some, unloading the weight of the upper section onto the cement1} the woven lower shafts 6 are cut off, and the sealing rings 4 together (with the detachable nozzle 2 are in tight connection with the sealing surface 9 of the receiving hopper 1. At the same time the scraper 3 moves in front of the sealing rings 4, cleans the inner sealing surface 9 of the receiving funnel 1 from sludge, scale, sediment and other abrasive particles deposited along the vertical sealing surface on the inner end 10, and creates favorable conditions for obtaining

tight connection of sections in wells with abnormally high reservoir pressure ...

The cleaning products are withdrawn from the compacted gap into the inside of the casing through the through radial holes 8.

Technical and economic efficiency

device enclosed. preventing

leaks in casing section joints in wells with abnormally high formation pressure.

Claims (2)

1. USSR author's certificate number 157646, cl. E 21B 17/08, 1961. 2. USSR author's certificate number 258194, cl. E 21B 17/08, 1968. H5 /