The invention relates to a
well drilling type oil gas preparing
system through gasification and
dry distillation of
oil shale at a
normal position and a technical method thereof. At least two parallelly arranged directional wells are arranged in an
oil shale layer, the horizontal sections of the directional wells are arranged at the bottom of the
oil shale layer, an igniting well is respectively arranged between the
tail ends of the horizontal sections of the directional wells and the ground, a plurality of auxiliary gasifying wells are arranged between the horizontal sections of the directional wells and the ground, the horizontal sections of the directional wells are arranged between the vertical sections of the directional wells and the igniting wells, and a plurality of oil gas collecting wells are arranged between the gasifying area and the ground. The technological procedure includes: igniting for reverse fire power penetration and expanding a gasification and
dry distillation passage; gasifying and dry-distilling the oil shale layer of the gasifying area in positive, negative or fixed point mode; loosening and heating the oil shale layer in a
dry distillation area so as to produce cracks on the dry
distillation area and generate oil
shale oil gas and
combustible gas; collecting the oil
shale oil gas through an oil gas collecting well; and condensing and separating the oil
shale oil gas on the ground surface, thereby obtaining oil shale oil and
combustible gas. The
well drilling type oil gas preparing
system through gasification and dry
distillation of the oil shale at the
normal position integrates shaft building, oil shale exploitation and ground surface dry
distillation oil preparing technology, shortens the production process, is small in investment, high in efficiency and safe and protects the environment.