METHOD FOR DELIVERING DEVICES INTO WELL AND DEVICE FOR REALIZATION OF SAID METHOD Russian patent published in 2005 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula P_pipe≥ P_well(S_cable/S_pipe-1)-Q_cablexL_cable/S_pipe<P_tear, where P_pipe - pressure of fluid in pipe, kg-wt/sm²; S_cable - cross-section of cable with pipe, sm²; P_well - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm²; S_pipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Q_cable - weight of 1 km of cable with pipe, kg-wt; L_cable - length of cable to depth of planned delivery of devices, km; P_tear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm², determined from formula: P_tear=F_tear/S_pipe, where F_tear - tear force for cable according to documentation, kg-wt.

EFFECT: higher efficiency.

3 cl, 1 dwg, 1 tbl