METHOD OF EXTRACTING BROKEN AND STUCK PIPES STRING OF FLEXIBLE PIPES OF EMERGENCY WELL Russian patent published in 2016 - IPC E21B31/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, specifically, to extraction of broken stuck pipe string of flexible pipes from well using flexible pipe. Method includes lifting to surface of free part of broken flexible pipe string, cutting deformed lower part of extracted string, connecting to cut lower part of flexible pipe string fishing assembly, comprising at least internal tubing catcher, hydraulic jack, percussion mechanism and a hydraulic anchor with an inner diameter, smaller than outer diameter of tubing string. Mounting transfer chamber, through which tubing is lowered with fishing assembly in tubing string to contact with deformed broken head top part and stuck part of pipe string to form a circular space between lowered string and tubing string for providing circulation, mounting and fixation of fishing assembly in inner cavity of tubing string is carried out by means of hydraulic anchor, making up grip of inner tubing catcher with inner cavity of broken head and stuck pipe string part of flexible pipe by impact action. Drawing broken and captured string of flexible tubes with help of hydraulic jack, performing unfastening of fishing assembly, extracting free broken part of column from emergency well.

EFFECT: improving reliability of pipe extraction from emergency well under pressure without well killing.

1 cl, 3 dwg