| 摘要 |
An apparatus for fluid treatment of a borehole, the apparatus comprising: a tubing string having a long axis and an upper end, a first port opened through the wall of the tubing string, a second port opened through the wall of the tubing string, the second port axially offset from the first port and positioned between the first port and the upper end, a third port opened through the wall of the tubing string, the third port axially offset from the second port and positioned between the second port and the upper end, a first packer operable to seal about the tubing string and mounted on the tubing string to act in a position offset from the first port along the long axis of the tubing string, a second packer operable to seal about the tubing string and mounted on the tubing string to act in a position between the first port and the second port along the long axis of the tubing string; a third packer operable to seal about the tubing string and mounted on the tubing string to act in a position between the second port and the third port along the long axis of the tubing string; a first closure positioned relative to the first port, the first closure being actuable relative to the first port between a closed port position and a position permitting fluid flow through the first port from the tubing string inner bore; a second closure being actuable relative to the second port between a closed port position and a position permitting fluid flow through the second port from the tubing string inner bore; and a third closure being actuable relative to the third port between a closed port position and a position permitting fluid flow through the third port from the tubing string inner bore; a closure actuating mechanism for actuating the first closure and the second closure together from their closed port positions to their positions permitting fluid flow, while the third closure remains in the closed port position.
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