Abstract: This invention relates to the oil and gas production industry and can be used in geophysical surveys of horizontal and deviated (including vertical) wells for their injectivity profiling and assessment of total fluid loss into the lower zone of a target interval, inaccessible for survey, and below the bottom hole. The proposed technology can be used in the presence of both behind-casing and wellbore cross-flows.

Abstract: The invention relates to oil and gas production industry and can be used in production well logging operations. The method of determining a production well flow (production) profile in terms of hydrodynamic characteristics of individual reservoir units (their productivities and far-field reservoir pressures) in a multilayer reservoir includes temperature Tf(1) and bottomhole pressure pb(1) measurements along the wellbore after the well has been producing for a long time at a known constant rate in a quasi-stationary regime, after which the rate is changed by a predetermined value for a period sufficient for a new quasi-stationary flow regime to set in, and then temperature Tf(2) and bottomhole pressure pb(2) measurements along the wellbore are repeated. Whenever necessary and practicable, additional temperature and bottomhole pressure measurements along the wellbore are performed in different well-operation regimes, at different total flow rates.

Abstract: The claimed invention relates to means for analysis of a mineral deposit under development using noise logging. The aim of invention consists in increasing accuracy of sound source position determining at surveying in wells with complicated multi-barrier design. The method for locating an acoustic noise source in a well comprises the stages of: computer simulation of acoustic field generated by one or more sources of acoustic signal in the well; simultaneous recording of acoustic signals inside the wellbore using a device for recording acoustic signals comprising at least two acoustic sensors; locating the sought acoustic signal sources in the well by means of co-processing of computer simulation data and data on acoustic signals inside the wellbore recorded using the aforementioned device.

Abstract: The preferred embodiments are directed to the oil-producing industry and can be used in operating multi-reservoir wells. A method for the determination of hydrodynamic parameters for each flowing reservoir that includes reaching at least one well operating mode with fluid flow through both the wellbore and one or more reservoirs, measuring at least one parameter that characterises fluid flow, recording its acoustic noise logging data, calculating noise power using reservoir fluid flow noise logging data, and subsequent multi-phase hydrodynamic modelling to determine hydrodynamic parameters for each identified reservoir.

Abstract: The claimed invention relates to means for analysis of a mineral deposit under development using noise logging. The aim of invention consists in increasing accuracy of sound source position determining at surveying in wells with complicated multi-barrier design. The method for locating an acoustic noise source in a well comprises the stages of: computer simulation of acoustic field generated by one or more sources of acoustic signal in the well; simultaneous recording of acoustic signals inside the wellbore using a device for recording acoustic signals comprising at least two acoustic sensors; locating the sought acoustic signal sources in the well by means of co-processing of computer simulation data and data on acoustic signals inside the wellbore recorded using the aforementioned device.

Abstract: This invention relates to the oil-producing industry and can be used in operating multi-reservoir wells. A method for the determination of hydrodynamic parameters for each flowing reservoir that includes reaching at least one well operating mode with fluid flow through both the wellbore and one or more reservoirs, measuring at least one parameter that characterises fluid flow, recording its acoustic noise logging data, calculating noise power using reservoir fluid flow noise logging data, and subsequent multi-phase hydrodynamic modelling to determine hydrodynamic parameters for each identified reservoir. One independent claim, one dependent claim, six figures.

Abstract: This invention relates to the oil and gas production industry and can be used in geophysical surveys of horizontal and deviated (including vertical) wells for their injectivity profiling and assessment of total fluid loss into the lower zone of a target interval, inaccessible for survey, and below the bottom hole. As distinguished from direct injection profiling methods applied to perforated intervals, the proposed technology can be used in the presence of both behind-casing and wellbore cross-flows.

Abstract: A group of inventions related to geophysical well logging, in particular to magnetic imaging defectoscopy of well casings including magnetized ones, that can be used to identify and classify defects in production and intermediate casing and tubing strings in oil and gas wells. An electromagnetic multi-sensor defectoscope for surveying casing pipes containing a source of the electromagnetic field in the form of a central exciter coil designed to transmit current pulses from a current pulse generator, a system of measuring elements placed on bow springs to be forced against the inner surface of a casing pipe, and a unit for signal recording, control and data processing connected to the system of measuring elements through communication lines. A method of multi-sensor electromagnetic defectoscopy for surveying casing pipes.

Abstract: In the present invention that considerable advantage is to be gained in the provision of apparatus and methods for spectral noise logging that exhibit improved frequency resolution and thus sensitivity over those systems known in the art since this would allow for improved detection and characterization of fluid flow through, or behind, a casing of a well penetrating subsurface formations.

Abstract: This invention relates to the monitoring of the integrity of casing, tubing and other strings in oil and gas wells. The technical result of this invention consists in increased accuracy and trustworthiness in detecting and locating transverse and longitudinal defects in well completion components and downhole equipment, in both the magnetic and non-magnetic first, second and other metal barriers. Electromagnetic defectoscopy in multi-string wells includes measuring EMF induced in a coil by eddy currents generated in metal barriers by the decay of the electromagnetic field produced by magnetization current pulses in the coil. A series of pulses of fixed duration in the range of 0.1-1000 ms is fed to each exciter-and-pickup coil to sequentially magnetize all metal barriers starting from the nearest one, with pulse durations increasing for each next barrier. The recorded data are saved and processed by comparing them with model data, and the processing results indicate detects in the metal barriers.

Abstract: A group of inventions related to geophysical well logging, in particular to magnetic imaging defectoscopy of well casings including magnetised ones, that can be used to identify and classify defects in production and intermediate casing and tubing strings in oil and gas wells. An electromagnetic multi-sensor defectoscope for surveying casing pipes containing a source of the electromagnetic field in the form of a central exciter coil designed to transmit current pulses from a current pulse generator, a system of measuring elements placed on bow springs to be forced against the inner surface of a casing pipe, and a unit for signal recording, control and data processing connected to the system of measuring elements through communication lines. A method of multi-sensor electromagnetic defectoscopy for surveying casing pipes.

Abstract: This invention relates to the monitoring of the integrity of casing, tubing and other strings in oil and gas wells. The technical result of this invention consists in increased accuracy and trustworthiness in detecting and locating transverse and longitudinal defects in well completion components and downhole equipment, in both the magnetic and non-magnetic first, second and other metal barriers. Electromagnetic defectoscopy in multi-string wells includes measuring EMF induced in a coil by eddy currents generated in metal barriers by the decay of the electromagnetic field produced by magnetization current pulses in the coil. A series of pulses of fixed duration in the range of 0.1-1000 ms is fed to each exciter-and-pickup coil to sequentially magnetize all metal barriers starting from the nearest one, with pulse durations increasing for each next barrier. The recorded data are saved and processed by comparing them with model data, and the processing results indicate detects in the metal barriers.

Abstract: In the present invention that considerable advantage is to be gained in the provision of apparatus and methods for spectral noise logging that exhibit improved frequency resolution and thus sensitivity over those systems known in the art since this would allow for improved detection and characterisation of fluid flow through, or behind, a casing of a well penetrating subsurface formations