Abstract: A downhole measurement tool assembly is for measuring at least one quantity in a well-bore, and has: i) a pressure housing; ii) a sensor for measuring the quantity in the wellbore; iii) a memory for storing values of the quantity to obtain stored measurement data for later read-out; iv) an antenna for allowing wireless communication of the stored measurement data between the downhole measurement tool assembly and an external read-out system while the downhole measurement tool assembly resides at the surface out of the wellbore, wherein the antenna is mounted at an external side of the pressure housing such that it is exposed to pressure in the wellbore when residing in the wellbore; v) a transceiver for controlling the communication via the antenna, and vi) a pressure connector in an external sidewall of the pressure housing, wherein the antenna is coupled to the internal transceiver via the pressure connector.

Abstract: A downhole calliper tool is for measuring distance between the calliper tool and an interface in a well, such as a petroleum well or a geothermal well. The downhole calliper tool has an impulse radar system (of the CTBV-type) with at least one impulse radar unit configured for: a) transmitting electromagnetic pulses with the impulse radar unit in a direction away from the downhole calliper tool, and for b) receiving reflections of said electromagnetic pulses with the impulse radar unit, and for c) analyzing said reflections to determine the distance between the impulse system and the interface. The impulse radar system is designed for carrying out at least one distance determination per second, but preferably at least ten distance determinations per second.

Abstract: A downhole measurement tool assembly is for measuring at least one quantity in a well-bore, and has: i) a pressure housing; ii) a sensor for measuring the quantity in the wellbore; iii) a memory for storing values of the quantity to obtain stored measurement data for later read-out; iv) an antenna for allowing wireless communication of the stored measurement data between the downhole measurement tool assembly and an external read-out system while the downhole measurement tool assembly resides at the surface out of the wellbore, wherein the antenna is mounted at an external side of the pressure housing such that it is exposed to pressure in the wellbore when residing in the wellbore; v) a transceiver for controlling the communication via the antenna, and vi) a pressure connector in an external sidewall of the pressure housing, wherein the antenna is coupled to the internal transceiver via the pressure connector.

Abstract: A downhole calliper tool is for measuring distance between the calliper tool and an interface in a well, such as a petroleum well or a geothermal well. The downhole calliper tool has an impulse radar system (of the CTBV-type) with at least one impulse radar unit configured for: a) transmitting electromagnetic pulses with the impulse radar unit in a direction away from the downhole calliper tool, and for b) receiving reflections of said electromagnetic pulses with the impulse radar unit, and for c) analyzing said reflections to determine the distance between the impulse system and the interface. The impulse radar system is designed for carrying out at least one distance determination per second, but preferably at least ten distance determinations per second.

Abstract: A system and method are disclosed for regulating drilling fluid pressure in a drilling fluid circulation system. In one embodiment, a drilling fluid circulation system includes a processor (110) connected to a pressure relief device (104), which is connected to piping between a discharge of a drilling fluid pump (30) and an inlet of a drill string (31). The processor receives pressure measurement signals representative of a pressure of the drilling fluid in the piping and flow parameter signals representative of a flow of the drilling fluid through the piping. From the pressure measurement signals and the flow parameter signals, the processor determines that a target pressure parameter of the drilling fluid in the piping is not satisfied. In response, the processor lowers the pressure of the drilling fluid in the piping until the target pressure parameter is satisfied by at least partially opening the pressure relief device.

Abstract: A system and method are disclosed for regulating drilling fluid pressure in a drilling fluid circulation system. In one embodiment, a drilling fluid circulation system includes a processor (110) connected to a pressure relief device (104), which is connected to piping between a discharge of a drilling fluid pump (30) and an inlet of a drill string (31). The processor receives pressure measurement signals representative of a pressure of the drilling fluid in the piping and flow parameter signals representative of a flow of the drilling fluid through the piping. From the pressure measurement signals and the flow parameter signals, the processor determines that a target pressure parameter of the drilling fluid in the piping is not satisfied. In response, the processor lowers the pressure of the drilling fluid in the piping until the target pressure parameter is satisfied by at least partially opening the pressure relief device.