Calculating minimum perforating depth with consideration of plastic deformation around well-hole

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2007,（2）
• 页码范围: 140-143
• 页数: 4页
• 语种: 英文

摘要

In order to obtain the perforation depth, the three zones with different permeability because of plastic deformation and fluid invasion were studied based on related theories. The study shows that the calculation of perforation depth should take account of not only damaged zone, but also plastic zone, because the plastic zone has much lower permeability. The required minimum perforation depth was obtained by making the solution of elastic/plastic equations, and the factors affecting perforation depth were analyzed accordingly.