The abrasion of floating ring caused the increase of the gap, which increased the spill of sludge oil, exceeding the processing capacity of sludge oil collector, resulting in oil leakage of freezing machine.

Comparison and optimum design of various sewage intercepting wells;

Discuss on comparison and optimization for different types of sewage intercepting wells;

Beginning with simplifying the oil-gathering process for single well,this paper explains how to optimize flow stations and oil-transfer stations as well as connect the new production facilities to the old ones.