Optical fiber oil and gas well casing pipe string structure and full-life-cycle real-time monitoring method

The invention belongs to the technical field of oil well monitoring, and particularly relates to an optical fiber oil and gas well casing pipe string structure and a full-life-cycle real-time monitoring method. An optical fiber oil and gas well casing pipe string structure comprises a float shoe, a first casing pipe, a first float collar, a second casing pipe, a second float collar, a first optical fiber casing pipe, a second optical fiber casing pipe and a cable-penetrable casing pipe head which are sequentially connected from bottom to top, and the first optical fiber casing pipe and the second optical fiber casing pipe are each of a double-layer pipe structure. Comprising an inner-layer steel pipe and an outer-layer diameter-reducing steel pipe tightly attached to the outer side of the inner-layer steel pipe, and a plurality of optical fiber sensors are evenly arranged on the outer side of the inner-layer steel pipe in the circumferential direction. Through the optical fiber oil-gas well casing pipe string