SU504870A1 - A die for trapping and retrieving dangling pipes from a well - Google Patents

Description

one

The invention relates to the field of emergency response in the drilling of oil and gas wells, in particular, to means for removing broken pipes from the well.

Known streamers for capturing and extracting dangling pipes from a well, which make it possible to reliably capture and remove a broken section of a pipe string down the well. However, most of the known pipeheads, whose gripping units are designed to grip relatively juicy steel pipes, are hardly applicable for extracting pipes from lighter and less durable alloys, which are currently in fairly widespread use in connection with the drilling of ultra-deep wells.

Also known trapovnosti, with the help of which it is possible to perform work on the extraction of dangling pipes from a well, made of a material less durable than steel. It contains a housing with central and lateral channels, a sub and a gripping sleeve with an annular groove on the inner surface. The cavity formed between the gripping bushing and the pipe to be extracted is filled with the core material, which wedges as the tubing is lifted, causing a uniform load on the pipe to be pulled.

The purpose of the invention is to determine the moment of filling the cavity material formed between the gripping sleeve and the pipe to be extracted with the material to be clamped.

For this, the proposed flip-flop is equipped with a bursting diaphragm, which does not overlap the central channel of the body, while the body cavity above the bursting diaphragm is communicated through the side channels with the groove of the gripping sleeve.

The drawing shows the proposed trubolovka, general view.

The pipe contains a housing 1 with a central 2 and lateral 3 channels, a sub 4, a gripping sleeve 5 with an annular groove 6 on the inner surface and a bursting diaphragm 7. The latter closes the central channel 2, while the body cavity above the rupture diaphragm communicates through the lateral channels 3 with the groove 6 gripping sleeve 5.

The work with the trap is carried out as follows.

The pipe on the drill pipe string. it is lowered into the well and covers the recoverable pipe 8 with it, preventing damage to the bursting diaphragm 7. After that, washing liquid mixed with the backing material, for example, drilling mud, is pumped into the pipe string along the drill string. This mixture enters the trubolovku through the central channel 2 and through the side channels 3 of the housing 1 - in the annular groove 6 of the wedge-shaped form. Here the jamming material is stuck, jamming the retrievable pipe 8, and the flushing fluid through the annular gaps between the gripping sleeve 5 and the recoverable pipe enters the well. When the entire annular groove 6 is filled with the caster material, as a result of which the recoverable pipe 8 is securely seized in the tubing, pressure rises significantly in the body cavity and the rupture diaphragm 7 is destroyed. This moment is fixed on the surface by the readings of the pressure gauges, which serve as a signal of full filling.

Truolov cavities with the caster material, but the dangling pipe string is lifted ..

Claims (1)

Invention Formula A die for capturing and extracting dangling pipes from a well, comprising a housing with central and lateral channels, a sub and a gripping sleeve with an annular The groove on the inner surface, characterized in that, in order to determine when the cavity of the tubule is filled with the casing material, it is provided with a ruptured diaphragm that overlaps the central channel, while the body cavity above the ruptured diaphragm communicates through the side channels with the groove of the gripping sleeve.