Abstract: In some embodiments, a method for reducing magnetic debris accumulation on a downhole sensor within a tubular conveyed in a borehole comprises supplying a voltage to temporarily neutralize a magnetic field of a permanent electromagnet proximate to the downhole sensor and removing magnetic debris on the downhole sensor via a flow of a first fluid in the tubular while the magnetic field is neutralized.

Abstract: Disclosed herein are systems and methods for automating a start of a pump-down operations that adjusts a pump rate and a winch speed. The methods include lowering a tool string into a wellbore via a wireline controlled by a winch unit and a pump unit, measuring at least one measurement parameter, calculating a range of wireline tension references for the winch unit from at least inputs comprising at least one user configuration parameter and the at least one measurement parameters, and a range of wireline tension references for the pump unit from at least inputs comprising at least one user configuration parameter and the at least one measurement parameters, generating a tension error signal when the measured tension of the wireline deviates from at least one of the calculated ranges of wireline tension references, and adjusting the lowering of the downhole tool string in response to the tension error signal.

Abstract: Disclosed herein are systems and methods for automating a pump-down stop operation and, more particularly, example embodiments may include an automated pump-down stop system that adjusts a fluid rate and a winch speed before the target depth based on the remaining depth and line speed. An example method for automating a pump-down stop operation of a downhole tool string includes: measuring a depth of the downhole tool string, wherein the downhole tool string is held by a wireline; measuring a wireline tension; measuring a speed of the wireline; measuring a pumping rate; measuring an inclination of the downhole tool string; and regulating automatically a winch controller and a pump controller simultaneously to stop the downhole tool string at a target depth based at least on the measurements of one or more of the depth, wireline tension, speed, pumping rate, and/or inclination.

Abstract: In some embodiments, a method for reducing magnetic debris accumulation on a downhole sensor within a tubular conveyed in a borehole comprises supplying a voltage to temporarily neutralize a magnetic field of a permanent electromagnet proximate to the downhole sensor and removing magnetic debris on the downhole sensor via a flow of a first fluid in the tubular while the magnetic field is neutralized.

Abstract: A sensor device can be used to detect the presence of a cement composition in a reverse cementing operation. The sensor device can include a resistivity sensor, an acquisition and measurement apparatus, and an actuator. The actual derivative of resistivity of the drilling mud, spacer fluid, and cement composition to be used can be pre-determined. The acquisition and measurement apparatus can be pre-programmed with a slope change derivative of resistivity profile for the fluids. The resistivity sensor can measure the resistivity of the fluids as they flow past the resistivity sensor in the wellbore. When the acquisition and measurement apparatus receives a desired slope change reading within the slope change derivative of resistivity profile, instructions can be sent to the actuator to close a valve and block fluid flow through the casing or tubing string.

Abstract: A sensor device can be used to detect the presence of a cement composition in a reverse cementing operation. The sensor device can include a resistivity sensor, an acquisition and measurement apparatus, and an actuator. The actual resistivity of the drilling mud, spacer fluid, and cement composition to be used can be pre-determined. The acquisition and measurement apparatus can be pre-programmed with a resistivity profile for the fluids. The resistivity sensor can measure the resistivity of the fluids as they flow past the resistivity sensor in the wellbore. When the acquisition and measurement apparatus receives a desired reading within the resistivity profile, instructions can be sent to the actuator to close a valve and block fluid flow through the casing or tubing string.