The procedure is often used to increase well yields of newly-drilled wells with marginal or inadequate production rates.
It may also be applied to older, existing wells that have progressively diminished production over time, which is usually an effect of mineralization and incrustation of rock fractures.
When utilizing one packer, it is set near the top of the well, but at a minimum safe distance below the drive shoe. After the initial ‘frack sequence, the packer is deflated or unlocked, then lowered further into the hole. This process is repeated as many times as are necessary. “Straddle fracturing” utilizes a two-packer system where the packers are placed in series and water is pumped into the area between them. The process involves starting at the bottom of the well and working up in 40 to 60 foot increments.
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