Downhole screw motor

Abstract

To obtain technical result—creation of a new downhole screw motor ensuring a higher efficiency and increasing performance coefficient of a motor and motor operational life, improving of drilling efficiency—in a downhole screw motor comprising a stator having an internal screw surface, a rotor placed inside a stator having external screw surface, a sealing system, a spindle assembly, as per the invention as a sealing system the following system is used: a system, which contains a contact elastic, multilayered sealing agent, moreover a tough straps making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers separately gas and/or liquid is used as sealing media; a sealing system contains a separation joint of drilling mud flow, an electrogenerating turbine, a pumping unit for drill mud, regulating units of movement direction of sealing media and drill mud, a mud hopper, automatic control system and also, in accordance with applied sealing media, a tank-stabilizer with gas, a compressor, a heat exchanger for gas cooling and/or a tank-stabilizer with liquid, a pump, a heat exchanger for liquid cooling.

1 . A downhole screw motor comprising a stator having an internal screw surface, a rotor placed inside a stator having external screw surface, the quantity of screw lobes of a rotor is one less than a stator, a sealing system, a spindle assembly is different in that as a sealing system the following system is used: a system, which contains a contact elastic, multilayered sealing agent rigidly connected either with a stator or with a rotor or contains two sealing agents, which separately rigidly connected one with a stator, the other with a rotor, moreover a tough straps (made of strong material, for example, metal) making layers in a sealing agent, have close ring-like shapes and are similar to the surface, to which they are fixed; the quantity of layers of a sealing agent is not more than six; in the layers separately gas and/or liquid is used as sealing media; a sealing system comprises , a separation joint of drilling mud flow, an electrogenerating turbine, a pumping unit for drill mud, regulating units of movement direction of sealing media and drill mud, a mud hopper, automatic control system and also, in accordance with applied sealing media, a tank-stabilizer with gas, a compressor, a heat exchanger for gas cooling and/or a tank-stabilizer with liquid, a pump, a heat exchanger for liquid cooling.