Petroleum fishing device pipeline for oilfield drilling and preparation process thereof

The invention relates to a petroleum fishing device pipeline for oilfield drilling and a preparation process thereof. The petroleum fishing device pipeline for oilfield drilling comprises an inner-layer pipe, an insulating layer and an outer-layer pipe, and the insulating layer is compounded on the inner-layer pipe and located between the inner-layer pipe and the outer-layer pipe; the inner-layerpipe comprises an inner steel pipe, a liquid silica gel layer and a heating tape layer; the liquid silica gel layer is compounded on the outer wall of the inner steel pipe; the heating tape layer is compounded on the outer wall of the liquid silica gel layer; the outer-layer pipe comprises an outer steel pipe and a second heat conduction layer, and the second heat conduction layer is composited tothe outer wall of the outer steel pipe. The petroleum fishing device pipeline for the oilfield drilling has the effects that the temperature of petroleum passing through the pipeline can be adjustedand controlled, the petroleum conveying temperature is stabilized to be 60 DEG C, and the oil fishing conveying operation efficiency is improved. The preparation process of the petroleum fishing device pipeline for the oilfield drilling comprises the following steps that the inner-layer pipe is prepared; the insulating layer is wound on the outer wall of the inner-layer pipe to obtain an inner steel pipe semi-finished product; the outer steel pipe is mounted on the outer wall of the inner steel pipe semi-finished product in an embracing mode; the outer steel pipe is coated with a first heat-conducting layer; aging, screening and inspecting are conducted to obtain a qualified product. The preparation method has the advantage of batch production.