Method and apparatus for wellbore fluid treatment

A method for fluid treatment of a borehole, the method comprising:

• providing an apparatus for wellbore treatment including a tubing string having a long axis and an inner bore, a first port opened through the wall of the tubing string with a cap mounted thereon and extending into the tubing string inner bore, a second port opened through the wall of the tubing string, the second port offset from the first port along the long axis of the tubing string, 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 offset from the second port along the long axis of the tubing string and on a side of the second port opposite the second packer;
• a first sleeve positioned relative to the first port, the first sleeve being moveable 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 wherein the first sleeve has engaged against and opened the cap, a second sleeve being moveable 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 sleeve shifting means for moving the second sleeve from the closed port position to the position permitting fluid flow, the means for moving the second sleeve selected to create a seal in the tubing string against fluid flow past the second sleeve through the tubing string inner bore and;
• running the tubing string into a wellbore in a desired position for treating the wellbore;
• setting the packers;
• conveying the means for moving the second sleeve to move the second sleeve and increasing fluid pressure to force wellbore treatment fluid out through the second port.

Am apparatus for fluid treatment of a borehole, the apparatus comprising:

• a tubing string having a long axis and an inner bore, a first port opened through the wall of the tubing string with a sliding sleeve mounted thereover in the inner bore, a second port opened through the wall of the tubing string, the second port offset from the first port along the long axis of the tubing string, 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 offset from the second port along the long axis of the tubing string and on a side of the second port opposite the second packer;
• a first sleeve positioned relative to the first port, the first sleeve being moveable 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 wherein the first sleeve has engaged and moved the sliding sleeve away from the first port and a second sleeve being moveable 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 sleeve shifting means for moving the second sleeve from the closed port position to the position permitting fluid flow, the means for moving the second sleeve selected to create a seal in the tubing string against fluid flow past the second sleeve through the tubing string inner bore.

A method for fluid treatment of a borehole, the method comprising:

• providing an apparatus for wellbore treatment including a tubing string having a long axis and an inner bore, a first port opened through the wall of the tubing string with a sliding sleeve positioned thereover in the inner bore, a second port opened through the wall of the tubing string, the second port offset from the first port along the long axis of the tubing string, a first packer operable to seal about the tubing string end 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 mourned 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 offset from the second port along the long axis of the tubing string and on a side of the second port opposite the second packer, a first sleeve positioned relative to the first port, the first sleeve being moveable 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 wherein the first sleeve has engaged and moved the sliding sleeve away from the first port, a second sleeve being moveable relative to the second port between a closed port position and a position permitting fluid flow through the second port from the tubing stung inner bore;
• and a sleeve shifting means for moving the second sleeve from the closed port position to the position permitting fluid flow, the means for moving the second sleeve selected to create a seal in the tubing string against fluid flow past the second sleeve through the tubing string inner bore and;
• running the tubing string into a wellbore in a desired position for treating the wellbore;
• setting the packers;
• conveying the means for moving the second sleeve to move the second sleeve and increasing fluid pressure to force wellbore treatment fluid out through the second port.