Abstract: A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Abstract: A method for measuring formation conductivity distribution based on transient electromagnetic eddy current field is provided. The method includes arranging a transmitter coil and a first array receiver coil to a target stratum of a transmitter well, arranging a second array receiver coil to a target stratum of a receiver well, periodically turning on and off the transmitter coil, moving the transmitter coil and the first array receiver coil for a first preset distance, acquiring a first eddy current signal of the first array receiver coil and a second eddy current signal of the second array receiver coil in a moving process of the first preset distance, moving the second array receiver coil for a second preset distance, moving the transmitter coil and the first array receiver coil for the first preset distance till the measurement of the whole well segments is completed, and obtaining formation conductivity distribution.

Abstract: The present invention discloses an oil-displacing system and method. The system includes a power supply, a control switch, a controller and a transient electromagnetic generator. The power supply is connected to the transient electromagnetic generator, the control switch is disposed in a connection path between the power supply and the transient electromagnetic generator, and a control end of the control switch is connected to the controller. The controller is configured for controlling the closing and opening of the control switch, thereby controlling the connection and closing of the connection path between the power supply and the transient electromagnetic generator. The transient electromagnetic generator is disposed in an oil well casing at a position in an oil formation, for generating a transient electromagnetic field according to the connection and closing of the connection path between the power supply and the transient electromagnetic generator.

Abstract: The present invention relates to a device, method and system for measuring a resistivity of an open hole formation in a vertical direction. The device includes an acoustic wave transmitting probe and a plurality of acoustic wave receiving probes. The acoustic wave transmitting probe is located below each of the acoustic wave receiving probes such that the acoustic wave transmitting probe and the plurality of acoustic wave receiving probes are coaxially and parallelly disposed in an open hole. The axial direction of the acoustic wave transmitting probe and the acoustic wave receiving probes is parallel to the axial direction of the open hole and is perpendicular to the direction of the formation. The measurement accuracy of the resistivity can be improved by using the device, method and system of the present invention.

Abstract: The present invention discloses an oil-displacing system and method. The system includes a power supply, a control switch, a controller and a transient electromagnetic generator. The power supply is connected to the transient electromagnetic generator, the control switch is disposed in a connection path between the power supply and the transient electromagnetic generator, and a control end of the control switch is connected to the controller. The controller is configured for controlling the closing and opening of the control switch, thereby controlling the connection and closing of the connection path between the power supply and the transient electromagnetic generator. The transient electromagnetic generator is disposed in an oil well casing at a position in an oil formation, for generating a transient electromagnetic field according to the connection and closing of the connection path between the power supply and the transient electromagnetic generator.