Method and apparatus for local supply of a treatment fluid to a well portion
AssigneeArcher Norge AS
InventorReidar Lovik
Life of this patent
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Abstract
An apparatus is for supplying a treatment fluid to a well portion. A container is provided with a fluid chamber which is in closable fluid communication with at least one first outlet, the fluid chamber being defined by front and rear pistons. The front piston, in a starting position, forms a fluid barrier between the fluid chamber and the at least one first outlet, and the rear piston is provided with a rear piston rod projecting from a rear container end. A method is for supplying a treatment fluid to a well portion.
Claims14
An apparatus for supplying a treatment fluid to a well portion, the apparatus comprising a container provided with a fluid chamber which is in closable fluid communication with at least one first outlet, wherein the fluid chamber is defined by front and rear pistons, the front piston, in a starting position, providing a fluid barrier between the fluid chamber and the at least one first outlet, the rear piston being provided with a rear piston rod projecting from a rear container end, wherein a front piston rod projecting from the rear piston and being arranged to abut supportingly by a projecting end portion against the front piston, is releasably fixed to at least one of the rear piston and the rear piston rod by a breakable anchoring, wherein the front piston rod is received in both the rear piston and the rear piston rod.
A method of supplying a treatment fluid to a well portion by an apparatus which includes a container forming a fluid chamber defined by front and rear pistons, the container being provided with at least one first outlet, the method comprising:
- a) carrying the treatment fluid into the fluid chamber;
- b) moving the apparatus into a well which includes the well portion to be treated, and positioning the apparatus in the well portion;
- c) moving the front piston in order thereby to provide a fluid communication between the fluid chamber and the well portion through the at least one first outlet;
- and
- d) moving the rear piston towards the front piston in order thereby to empty the fluid chamber through the at least one first outlet;
- e) moving the rear piston towards the front piston by breaking an anchoring of a front piston rod to at least one of the rear piston and the rear piston rod, the front piston rod, projecting from the rear piston, being moved into a cut-out in the rear piston and the rear piston rod.
An apparatus for supplying a treatment fluid to a well portion, the apparatus comprising a container provided with a fluid chamber which is in closable fluid communication with at least one first outlet, wherein the fluid chamber is defined by front and rear pistons, the front piston, in a starting position, providing a fluid barrier between the fluid chamber and the at least one first outlet, the rear piston being provided with a rear piston rod projecting from a rear container end, wherein a front piston rod projecting from the rear piston and being arranged to abut supportingly by a projecting end portion against the front piston, is releasably fixed to at least one of the rear piston and the rear piston rod by a breakable anchoring,
- wherein the rear piston is provided with a filling passage and a draining passage, each extending from the fluid chamber to a port which is accessible from the outside of the apparatus when the rear piston is in a starting position.
Dependencies are inferred from the claim text.