METHOD FOR CLEANING BOTTOMHOLE FORMATION ZONE AND PLANT FOR IMPLEMENTATION THEREOF Russian patent published in 2010 - IPC E21B37/00 

FIELD: oil and gas production.

SUBSTANCE: invention refers to extractive industry, namely to methods for cleaning a bottomhole formation zone. The method involves well fill with a working fluid and multiple exposure to the alternating stages of excess pressurisation and pressure relief to ensure a certain process variable. It is preceded with the geophysical and/or hydrodynamic well analysis to make a relevant fluid intrusion profile alignment with using ultrasonic vibrations mainly. A working fluid well is filled at atmospheric pressure with maintaining a low airspace over its mirror. Excess pressure is generated with compressed gas, mainly air, which is supplied to the airspace. The duration of the excess pressurisation is specified less than 0.1 of resonance vibration frequency cycle of a working fluid column that fills a well. Well fluid is used as a process variable determining process duration of exposure to the alternating stages of excess pressurisation and pressure relief. Exposure to the alternating stages of excess pressurisation and pressure relief continues until well fluid amount is at least 0.01 cubic metres per one running metre of bed formation thickness, which as one of basic parametres is determined by said analysis. A plant accommodates a wellhead fitting, excess pressurisation unit, a commercial frequency power supply and a carrying cable. In addition, the plant comprises electrically connected ultrasonic generator and ultrasonic vibration system. The excess pressurisation unit represents a compressed gas tank. The ultrasonic generator is located on the ground surface and connected to the commercial frequency power supply and to one end of the carrying cable. The ultrasonic vibration system is electrically connected and mechanically interconnected with the other end of the carrying cable and formed by rigidly connected ultrasonic vibration source and waveguide radiator link.

EFFECT: improved processing of the bottomhole formation zone, more rapid process and simplified control and regulation operations.

17 cl, 1 ex, 6 dwg