Patent ID: 8556539
Filing Date: 2013-10-15
Classification: E21B,F16L

Abstract:
1. A method for replacing a drainage structure located in a material, the method comprising: aligning a first section of a replacement drainage structure according to a line and grade of a drainage structure to be replaced, the replacement drainage structure having an interior cross-sectional dimension greater than an outer cross-sectional dimension of the drainage structure to be replaced; driving the first section into the material to be positioned substantially around the drainage structure to be replaced; driving a second section into the material and ahead of a leading edge of the first section, the second section having an interior cross-sectional dimension greater than an outer cross-sectional dimension of the drainage structure to be replaced and an outer cross-sectional dimension that is less than an inner cross-sectional dimension of the first section; and removing a portion of the drainage structure to be replaced.