FIELD: oil industry, particularly methods or apparatus for cleaning boreholes or wells.
SUBSTANCE: method involves determining depth of possible paraffin contamination, heating cable length, heating cable power in dependence of product output and temperature of isolation heating cable material melting; lowering heating cable in paraffin formation zone; regulating cable temperature to maintain temperature 5-50°C above paraffin melting temperature along the whole cable length along with maintaining product flow temperature at well output 50°C above maximal outlet product flow temperature in the case of heating cable absence. Heating cable is wound on controlled winch drum and heated up to 45°C or more before cable lowering in well. Then cable is heated under control in different winding layers. High well head pressure is overcome by applying axial force of transporter, which provides equalizing of lowered heating cable weight with expulsive pressure at well head. Device comprises heating cable wound on controlled winch drum with at least one temperature sensor and control station connected with the cable and performing control of cable heating. One end of the heating cable may be connected to power source for cable heating and has temperature sensors located in each second cable winding layer. The sensors are electrically connected with corresponding temperature measuring instruments connected to winch drum. Transporter comprises guiding and tightening rollers, as well as heating cable arranged in well in predicted paraffin formation zone and control station connected to the cable to control cable heating. The transporter has single drive and sectional body including two parts. One part is drive one, another part is lid. Independent rollers are installed in each body part. Mating gear wheels are connected to roller shafts so that gear wheels may be kinematically connected one to another and to rollers. Lid comprises even number of gear wheels, shafts and rollers. Drive part includes odd number thereof. One shaft is connected with drive. Driving part gear wheels are connected in pairs with corresponding gear wheel installed in lid.
EFFECT: elimination of previous well cleaning operation, overcoming of high well head pressure without well killing, possibility of device mounting at negative ambient temperature and, as a result, increased oil output.
16 cl, 6 dwg
