Abstract: A drilling fluid monitoring system and method includes a pump stroke counter providing an electrical signal representing the volume of drilling fluid pumped into a well, a flow sensing device providing an electrical signal representing the volume of drilling fluid flowing out of the well, fluid level an electrical measuring device providing an electrical signal representing the fluid level changes within a tank, and a device receiving the electrical signals emitted by the pump stroke counter, flow sensor and measuring device to indicate changes in the circulation of the well drilling fluid.

Abstract: A drilling fluid monitoring system and method includes a pump stroke counter providing an electrical signal representing the quantity of drilling fluid pumped into a well, a flow sensing device providing an electrical signal representing the flow of drilling fluid out of the well, fluid level an electrical measuring device providing an electrical signal representing the fluid level changes within a tank and a device receiving the electrical signals emitted by the pump stroke counter, flow sensor and measuring device to indicate changes in the circulation of the well drilling fluid.

Abstract: A device for and method of sensing conditions in a well bore by positioning a radioactive source adjacent the surface of the well bore for emitting a radioactive signal across the well bore. A means for detecting the radioactive signal is positioned opposite the radioactive source and electrical means are mounted with the detecting means for electrically measuring the intensity and frequency of occurrence of each detected signal. An electrical signal is provided by the electrical means for indicating the presence or absence of drilling fluids and/or the density of such fluids at the surface of the well bore.