FIELD: oil industry.
SUBSTANCE: invention is related to well fittings to be used when repairing wells in the process of successive round trip operations (RTO) with two pipe strings in one well. The adapter coil of the wellhead valve for a preventer with two rows of rams consists of a lower flange, made integral with a guide pipe, and an upper flange, made integral with a mating pipe, sealing grooves for sealing metal gaskets are cut in the lower and upper flanges. The wellhead fittings include a cross-pipe hanger of the first row of tubing pipes (TP), made in form of a disk with two channels, a support flange, sealing grooves and metal gaskets, a pipe hanger of the second row of pipes, and the first row of TPs is the TP string, which is longer than the TP column, which is the second row of pipes. The adapter coil is adjustable in height and is mounted on the cross-pipe holder of the first row of pipes. The guide pipe of the lower flange is equipped with protrusions in form of a trapezoid located on the outer surface of the pipe in one plane perpendicular to the axis of the pipe, and on the inner cylindrical surface of the mating pipe of the upper flange there are reciprocal and radial grooves for protrusions on the guide pipe of the lower flange, the reciprocal grooves are made along the axis on the inner surface of the return pipe, ensuring positioning of the upper flange relative to the lower flange, and the radial grooves are made in the radial direction and placed in the same plane perpendicular to the axis of the pipe, on the inner surface in several rows, ensuring fixation and adjustment of the length of the coil. A threaded hole is made in the radial groove of the mating pipe, which ensures fixation of the length of the coil by blocking the protrusion on the guide pipe of the lower flange with a locking screw, the screw is installed outside the mating pipe. A groove is made on the inner surface of the return branch pipe of the lower flange above the radial grooves, a seal is placed in the groove, ensuring the tightness of the coil branch pipes. The lower flange of the coil is made with a cutout for the branch pipe of the long tubing string, and the height of the coil is adjusted depending on the branch pipe of the long tubing string, fixed in the cross-pipe holder.
EFFECT: operational capabilities of the adapter coil of the wellhead valve are expanded, which ensures adjustment of the height of the preventer installation on the wellhead valve during successive RTOs in a well with a double-row pipe string, and reduces the time of installation of the preventer during RTOs in the well as well as the labour costs when installing the preventer on the wellhead fittings.
5 cl, 7 dwg
