Abstract:  With the development of oil field scale and the passage of production time, the Bohai Oilfield appears a batch of low production wells and long-term shutdown wells. These similar problems increasing each year make the oil field production decline, the investment increase, and the sustainable development of oil field be seriously restricted. How to introduce a low cost method to recover the capacity of problem wells which have potential to enhance production is an important research subject to remit the oil field output stress and promote the oil field sustainable development. Sidetracking in the same layer technology is suitable for horizontal well whose output is declining due to the reservoir geology and engineering factors. After fishing out a few part of sand control string, combined with the optimal selection of sidetracking points, directional well trajectory optimization, and application of new chemical plugging technology instead of conventional cement backfilling technology, sidetrack drilling can be used in open hole section. The successful application of sidetracking in the same layer technology in SZ 36-1 oil field M platform makes two wells' yield increased by 155.23% and 399.70% respectively.