The invention belongs to the technical field of gas
cut monitoring, and relates to an
early detection device of gas
cut in oil and gas drilling based on measurement of impedance. The main structure of the device comprises hollow pipes, through holes, prisms, chamfers, grooves, measuring circuit boards, lead wires, poles, cover boards, pole fasteners, insulated sealing
layers, routing holes and bolts. By the impedance measurement and imaging method, gas
cut is distinguished based on the great difference in impedance between
drilling fluid and gas, the gas contents in different positions on the circumferential direction of a well casing are obtained by a plurality of poles uniformly distributed in the circumferential direction, and the
early detection device is suitable for the condition that gas is unevenly distributed in the circumferential direction and improves the reliability of measurement. The
early detection device has the beneficial effects of simple structure, scientific and reasonable
measurement theory, convenient operation, good practicability, service environment friendliness, strong universality, low monitoring cost, strong applicability and easy popularization and use, can detect gas cut more accurately and reliably in time, and can realize early monitoring and detection of gas cut by MWD (Measure While Drilling) equipment.