The invention discloses an electromagnetic surveying
system while drilling of adjacent-well parallel intervals, which is capable of providing accurate guiding measurement and calculation for well path control of wells with complicated structures such as double-
horizontal wells, directional wells, interspaced wells and the like. The
system mainly comprises a magnetic short section, an underground double-magnetic sensor
survey meter, a computing
system for the adjacent-well parallel intervals, a ground display system and the like. In the invention, the underground double-magnetic sensor
survey meter comprises two high-precision alternating
magnetic field sensors, can detect two groups of
rotating magnetic field signals, and can accurately detect the adjacent-well parallel intervals by a certain drilling footage without a
drill bit, thereby being capable of
fishing surveying within shorter time; and a
data analysis and calculation procedure can be put in the well, and sends few
calculated data to the ground, thereby saving the
data transmission time. The invention has convenient use, provides an efficient innovative and high technology for the surveying while drilling and the control of the adjacent-well parallel intervals.