1. Philosophy of technology.     （Technology Principle）
A small drill bit is used to open a window on the casing in the oil zone. A hose with a jet nozzle is used to penetrate multiple slim holes (approximately 50mm diameter and 150mm long) in different directions in the oil zone with its hydraulic rock breaking（breaking rock） of high-pressure jet, which thereby increases the drainage radius of the existing borehole and achieve the elevated crude production.

 2. Technical features.
■  Oil recovery: Increased drainage radius and area and decreased oil flow resistance; deep-zone unplugging; improved effect of injection profile modification and water plugging; control water and gas coning..
■  Water injection: Orientated water injection, reduced injection pressure and improved water injection effect..
■  Its directions can be controlled to replace partial functions of multilateral sidetracking wells and horizontal wells; short （shorten）operation duration, cost-effectiveness and small contamination..
■  Deep zone acidizing stimulation and reduced fracturing pump pressure.       

3. Applicable well conditions.
■  Less than 3000m oil well, gas well, water well and coalbed gas well（coal-bed gas well）, and especially suitable for thin beds..
■  Window cutting point is at single-layer casing..
■  Over 4½″production casing.
■ Smaller than （less than）35Co hole deviation.