Single-barrel double-well wellhead device for efficiently extracting oil and gas and working method of single-barrel double-well wellhead device

The invention discloses a single-barrel twin-well wellhead device for efficiently extracting oil and gas and a working method thereof, and relates to the technical field of structures of wellhead devices, first internal threads are in threaded connection with a threaded ring, the threaded ring abuts against the top surface of an inner-layer casing hanger, and a radial hole communicated with a first liquid outlet hole is formed in the cylindrical surface of the threaded ring; an annular cavity is formed in the lantern ring, and a plurality of horizontal grooves corresponding to the through grooves are formed in the inner side wall of the annular cavity; a gland supported on the top surface of the pipe joint is sleeved outside the lantern ring; the gland and the upper end part of the pipe joint are locked into a whole through a locking bolt; the single-cylinder type oil and gas conveying device C further comprises an oil pipe, and a butt joint pipe coaxial with the oil pipe is welded to the top of the oil pipe.