Yield increasing technique for fixed point deep penetration horizontal drilling in oil-water well oil layer

The present invention relates to petroleum producing technology, and is horizontal drilling process in oil reservoir of oil and water well for increasing yield. The process includes the following steps: laying the underground horizontal boring machine with electric cable in cable car to preset depth, drilling holes on the casing in the mud collar, polluted zone and oil reservoir successively with the bit in the tip of flexible shaft, and reclaiming the bit after finishing drilling. The present invention has the advantages of no damage to the casing, no compacted zone in the drilled horizontal holes, effective penetration of polluted zone, simple apparatus structure, etc.