Horizontal well workover technology present situation and development trend

In the downhole operation of horizontal Wells, pipe string is subjected to combined action many kinds loads. The may bend sinusoidal or spiral under axial compressive stress, which will also increase friction between and wellbore wall. Because existence friction, milling, salvage, unstuck, sand other construction bring adverse effects. This paper describes characteristics well in fishing, washing, unlocking casing milling. introduces development application, such as drilling technology matching for complex structure wells, high-level completion lateral radial wells low permeability reservoirs supporting production wells.