Method and device for fluid displacement
AssigneeHpi AS
InventorsTom Unsgaard, Steffen Eversen
Life of this patent
Estimating the term…
Abstract
A method and device for displacement of a first fluid by means of a second fluid in a borehole (1) in the ground, where, during displacement, the second fluid is kept separate from the first fluid, and where the volume of an expandable space (22) in which the second fluid is to be located following the displacement, increases during inflow of the second fluid.
Claims20
A method of displacing a first fluid by means of a second fluid in a borehole in a ground wherein a feed pipe is located in the borehole and further wherein the feed pipe is connected to a piston body that is located between the feed pipe and a wall of the borehole wherein the feed pipe has a length defined between a first end and a second end, the method comprising the steps of:
- keeping the second fluid separate from the first fluid during a displacement;
- displacing the second fluid into an expandable space wherein the expandable space is defined by a closed membrane connected to the piston body and the feed pipe wherein the expandable space expands during an inflow of the second fluid wherein the second fluid is located in the expandable space following the displacement;
- and
- moving the piston body in a direction toward the first end of the feed pipe wherein the inflow of the second fluid into the expandable space expands the expandable space and further wherein expansion of the expandable space moves the piston body.
A device for displacement of a first fluid by a second fluid in a borehole in a ground wherein the borehole has a borehole wall, the device comprising:
- a feed pipe located in the borehole;
- a first valve body wherein the first valve body is displaced in a sealing manner in the feed pipe wherein the first valve body is arranged to seal against a first valve seat in the feed pipe;
- a second valve body wherein the second valve body is displaced in a sealing manner in the feed pipe wherein the second valve body is arranged to seal against a second valve seat in the feed pipe;
- a first orifice in the feed pipe wherein the first orifice is located between the first valve body and the second valve body and further wherein connection of the first valve body to the first valve seat directs the second fluid through the first orifice;
- a piston body located between the feed pipe and the borehole wall;
- and
- a membrane connected to the piston body wherein flow of the second fluid through the orifice moves the piston body in a direction toward the first end of the feed pipe.
A system for displacement of a first fluid by a second fluid in a borehole having a wall, the device comprising:
- a feed pipe located in the borehole wherein the feed pipe has a length defined by a bottom end and a top end and further wherein the feed pipe has a first orifice located between the top end and the bottom end;
- a first valve seat connected to the feed pipe wherein the first valve seat is located adjacent to the bottom end of the feed pipe;
- a second valve seat connected to the feed pipe wherein the second valve seat is located adjacent to the top end of the feed pipe and further wherein the first orifice is located between the first valve seat and the second valve seat;
- a first piston body connected to the feed pipe wherein the first piston body surrounds the feed pipe and further wherein the first piston body is located between the feed pipe and the wall of the borehole;
- a second piston body connected to the feed pipe wherein the second piston body surrounds the feed pipe and further wherein the second piston body is located between the feed pipe and the wall of the borehole wherein the second piston body is located above the first piston body;
- a membrane connected to the second piston body;
- and
- an expandable space defined by the feed pipe and the membrane wherein introduction of the second fluid to the expandable space moves the second piston body in a direction toward the top end of the feed pipe.
Dependencies are inferred from the claim text.