| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a well structure in which a discharge pipe for forcibly feeding fracturing fluid is arranged between a well hole provided on sand ground and a casing. <P>SOLUTION: A recharge well structure includes: an internal area A formed inside a casing 6 inserted into a well hole 4; an intermediate area B formed by filling a backfill material inside a gap between the well hole and the casing; and a fracture area C inside the intermediate area, for which the sand ground is fractured and a water path 20 is formed by discharging a degradable fracturing fluid to the sand ground around the intermediate area. By mixing granular support materials in the fracturing fluid, the support materials 22 are filled in the water path, and a gap is provided between the support materials by degradation of the fracturing fluid. A discharge pipe 12 having a fracturing fluid discharge port opened to the side outer part is vertically provided inside the intermediate area, and the support material is turned to a coarse grain material of a diameter larger than the average grain size of the sand ground. <P>COPYRIGHT: (C)2012,JPO&INPIT |
