Optimization of the Salvage Scheme of Sand Control String for Horizontal Wells in Bohai Oilfield

The fishing efficiency of the sand control string for horizontal wells directly affects the operating cost. The refined design of the sand control string helps to improve the efficiency. Based on the analysis about the low fishing efficiency of the sand control string for horizontal wells in Bohai Oilfield, this article has formed the method of segmented cutting, sleeve milling and fishing for wells with long sand control strings to be salvaged and large annular gaps. It also has formed methods of cutting, fishing and milling for wells with shorter pipe strings and smaller annular gaps. Practical results show that the refined design about the fishing scheme of the sand control string can effectively improve the fishing efficiency, realize the controllable of duration and cost, and reduce the operating cost.The design method about the refined fishing scheme of the sand control string proposed in this paper has a certain promotion value.