Abstract: A bottom-hole feeding mechanism comprising: a cylinder (1), a screw spindle (2) engaging with the cylinder (1) by means of a non-stopping splined screw pair (3), a first piston (6) received within the cylinder (1) and coupled with the screw spindle (2) and a hollow rod (8), an axial spindle (4) arranged along the cylinder (1) axis and engaging the cylinder (1) by means of an axial splined pair (5), a second piston (7) rigidly coupled with the axial spindle (4) and engaging the inner surface of the cylinder (1) and the outer surface of the hollow rod (8), wherein the hollow rod (8), the first piston (6), the second piston (7) and the cylinder (1) form a closed chamber (9) comprising a throttle (10), hydraulic channels (11) on the body of a valve (21), and a float (12).

Abstract: A bottom-hole feeding mechanism comprising: a cylinder (1), a screw spindle (2) engaging with the cylinder (1) by means of a non-stopping splined screw pair (3), a first piston (6) received within the cylinder (1) and coupled with the screw spindle (2) and a hollow rod (8), an axial spindle (4) arranged along the cylinder (1) axis and engaging the cylinder (1) by means of an axial splined pair (5), a second piston (7) rigidly coupled with the axial spindle (4) and engaging the inner surface of the cylinder (1) and the outer surface of the hollow rod (8), wherein the hollow rod (8), the first piston (6), the second piston (7) and the cylinder (1) form a closed chamber (9) comprising a throttle (10), hydraulic channels (11) on the body of a valve (21), and a float (12).

Abstract: The present invention relates to hydraulic jars which include a jar body; a spindle axially movable within the jar body and coupled to the jar body by means of a helical splined coupling; the spindle being connectable to a pipe string and the stuck object; a cylinder concentrically placed within the jar body with a radial gap, and having chambers for filling with a work fluid, the chambers being separated by a piston and fluidly connected by a channel, wherein the channel is provided by a back valve. The piston is axially movable within the cylinder, and is connectable to the spindle by means of a tractive rod, and to the body by means of a compensative rod. The piston is further provided with elastic split compression rings having initial gaps equal or close to zero.

Abstract: The invention relates to oil and gas industry and can be used in well drilling as a part of a Bottom Hole Assembly (BHA) to releasing stuck tools or equipment by applying axial and torque impacts. The claimed jar allows to increase the effectiveness of BHA operation in well drilling, especially when BHA comprises a telescopic system, since exception of unauthorized accidental operations of a jar substantially reduces the risk of failure in telescopic system electronic components, make the drilling process more predictable and enhance endurance of a jar itself. In case of emergency, the probability of retrieving stuck assembly will be incomparably higher, since the claimed jar provides the possibility to make simultaneously axial and torque impacts.

Abstract: The invention relates to rock destruction tools used for drilling oil and gas wells, especially for drilling slant and horizontal wells and formations having alternating layers of different hardness. The technical effect consist in improved steerability of the drilling bit and higher vibration resistance of polycrystalline diamond cutters (PDC) bit due to the use of a composite plating applied and adjustment of cutter protrusion over this plating. Blade drilling bit includes body with coupling thread, central channel, exit holes for flushing fluid and blades, equipped with polycrystalline diamond cutters PDC. Blade surface is covered with composite plating having different wear resistance depending on thickness, and tolerance of composite plating to abrasion wear increases from the outer surface to sublayers, and the size of cutter protrusion close to the centre of bit over the surface of composite plating is less than required for drilling the hardest formations in given geological section.