| 摘要 |
FIELD: mining.SUBSTANCE: bottomhole is mechanically destroyed and destruction products are removed with an auger tool with gaps of an auger spiral which is continuously rotated and oscillates in the axial direction with the amplitude exceeding the length of the maximum gap of the auger spiral per cycle of oscillations. The auger tool is separated into two unequal parts and placed into the internal space of a casing string. The first head part of a constant length is attached to the bottomhole part of the casing string and moved together with it progressively in the axial direction without oscillating motions. The second part is sectionally increased during lengthening of the casing string and deepening of the well and in a mobile telescopic manner in the axial direction it is connected with the first head part with a possibility of joint continuous rotary motion, and axial oscillating motions, separately from the head part, and the internal surface of the casing string is interfaced in a fixed manner with the supporting bearing assembly of the head part and in a mobile rotational manner - with the supporting bearing assemblies placed in gaps of the auger spiral.EFFECT: increase of the speed of drilling, recovery of the transporting ability at the section of rupture of the auger spiral in the zone of support of bearing assemblies at the integration of processes of transportation, fastening of well walls and prevention of bridging.4 cl, 5 dwg |
