Importance

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Abstract

An isolation gravel packer includes a housing which has a stinger receptacle disposed therein. The stinger receptacle has an open upper end and an inner cylindrical seal bore. The inner cylindrical seal bore sealingly receives a concentric inner tubing string therein for delivering a treatment fluid thereto. A treatment fluid passage is disposed laterally through the housing for communicating an interior of the stinger receptacle at an elevation below the seal bore with the well zone to be treated. First and second external seals are disposed on an exterior of the housing above and below the treatment fluid passage, respectively, for sealing between the housing and a liner bore. The housing also includes a combination bypass passage and return fluid passage disposed therein which is isolated from the treatment fluid passage. Treatment fluid is flowed from a surface location down through the concentric inner tubing string, then through the treatment fluid passage to the well zone. Return fluid flows from the well zone upward through the combination bypass passage and return fluid passage, then through an annulus between an outer tubing string and the concentric inner tubing string to the surface location.

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First Claim