DEVICE FOR CONNECTING FLANGES DURING WELL REPAIR Russian patent published in 2021 - IPC E21B33/03 F16L23/36 

FIELD: mining industry.

SUBSTANCE: invention relates to the field of mining, in particular to the oil and gas industry, and can be used in the repair of wells in order to seal the wellhead with the help of flange connections of wellhead equipment. A device for connecting the flanges during well repair is proposed, which contains the support and wellhead flanges tightened together through the combined holes, and an O-ring installed between the flanges in grooves with conical surfaces. In this case, the support and wellhead flanges are tightened together by 4 to 12 retainers. Moreover, each retainer consists of a rod equipped with a thread from the bottom, an eccentric handle pivotally fixed to the upper end of the rod, a support washer and an adjustment nut placed below the support washer and screwed onto the thread of the rod. In the initial position, the locking rods are installed in the combined holes of the support and wellhead flanges, and the adjusting nuts are screwed into the threads of the rods. In this case, the adjusting nuts interact with the lower end of the support flange with their upper ends, and the lower ends of the eccentric handles interact through the support washers with the upper end of the wellhead flange. In the working position, to tighten the support and wellhead flanges together by means of combined holes, the eccentric locking handles are rotated sequentially to the stop of the side ends of the eccentric handles through the support washer into the upper end of the wellhead flange with limited movement of the rods up and sealing the O-ring in the grooves with the conical surfaces of the support and wellhead flanges.

EFFECT: invention can be used in the repair of wells in order to seal the wellhead with the help of flange connections of wellhead equipment. Provided is also an increase in the tightness of the flange connection.

1 cl, 7 dwg