Abstract: The well reamer comprises a sub for attaching it to the drive means, a hollow housing with a central channel and radial openings in its side wall, projectable rolling cutters with shanks, mounted in the radial openings of the housing, and a mechanism for projecting the rolling cutters, including a piston and a member for locking the rolling cutters in their operating positions. The annular piston is connected with the housing for joint rotation therewith, and is regidly connected with the sub. The wall of the piston has radial passages made therein, establishing communication between its central channel and so annular space defined between the walls of the piston and of the housing. The member for locking the rolling cutters is accommodated with a clearance in the central channels of the piston and of the housing, and has an annular shoulder. The central channel of the piston defines a seat for engagement with the annular shoulder of the locking member.

Abstract: The method resides in profiling a part of a cylindrical pipe by drawing it through a moulding device, and reducing the pipe over its entire length for the diameter of the cylindrical part of the pipe to be substantially equal to the diameter of the circumscribed circle of its profiled part.The apparatus for performing the method comprises a drawing bench supporting a drawing die (2) accommodated in a housing (1) and a drawing carriage. Cams (6) are situated in front of the drawing die (2) at both sides of the path of the travel of a pipe (5) being manufactured, their one ends carrying deforming rollers (7) and their other ends carrying forked levers (8) cooperating with the drawing carriage through a tie (11) with slots (10) receiving therein lock pins (9) adapted to engage the forked levers (8). The apparatus further includes a pivoted lever (29) with a bearing roller (31), mounted on the housing (1).

Abstract: The arrangement for patching off troublesome zones in a well has a string of profile pipes with cylindrical portions at their ends, and a device for setting the string of profile pipes in a well, mounted for longitudinal reciprocation inside the string of profile pipes.Said device includes a reamer of the cylindrical portions of the profile pipes, positioned inside the uppermost cylindrical portion of the string of profile pipes, rigidly connected with an expander positioned above the string of profile pipes and having a housing with expanding elements mounted thereon.

Abstract: The method of well construction includes the steps of drilling the rock and consolidating it with a conductor casing, a surface casing string and a flow string, and isolating the troublesome zones of the well with profile pipes being reamed in the course of their setting. The reaming of the profile pipes is effected by building up a pressure drop across them and subsequently expanding them. The drilling of the rock after the casing-in of the well with the conductor casing and the surface casing string is preformed with a bit of one and the same diameter, with the troublesome zones being reamed to a diameter equalling the outer diameter of the reamed profile pipes which are successively set in all the troublesome zones of the well as they are exposed by the drilling.