| 摘要 |
An improved method for building an isolation plug in a horizontal wellbore using a fluid pill pumped into the wellbore at the end of a fracturing treatment. The fluid pill includes a high concentration of an ultra lightweight proppant and soluble material. The fluid pill is pumped down the wellbore until it almost reaches a desire zone. The pumping is then ceased or reduced, allowing the fractures to partially close. The ultra lightweight proppant remains suspended within the fluid pill while stationary. The pumping is then resumed at a very slow rate or as a short pump burst, thus causing the lightweight proppant and soluble material to bridge off until an isolation plug is formed. The plug is removed by dissolving the soluble material with or without performing a cleanout.
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