Method and apparatus for balanced pressure sampling
First Claim
Patent Images
1. A method of sampling fluid from a formation penetrated by a borehole, comprising:
- positioning a downhole tool having a flow line in the borehole;
establishing an inlet port through which fluid passes from a first point in the formation into the flow line;
establishing an outlet port through which fluid passes from the flow line into a second point in the formation;
passing fluid between the formation and the flow line through the inlet and outlet ports to create a flow circuit between the inlet port and the outlet port; and
performing an in-situ flow test of the formation using the created flow circuit;
wherein an invaded zone in the formation acts as a barrier to fluid flow into the borehole along the flow circuit.
0 Assignments
0 Petitions
Accused Products
Abstract
A method of sampling fluid from a rock formation penetrated by a borehole includes positioning a downhole tool having a flow line in the borehole, establishing an inlet port through which fluid passes from a first point in the formation into the flow line, establishing an outlet port through which fluid passes from the flow line into a second point in the formation, and passing fluid between the formation and the flow line through the inlet and outlet ports.
88 Citations
15 Claims
-
1. A method of sampling fluid from a formation penetrated by a borehole, comprising:
-
positioning a downhole tool having a flow line in the borehole; establishing an inlet port through which fluid passes from a first point in the formation into the flow line; establishing an outlet port through which fluid passes from the flow line into a second point in the formation; passing fluid between the formation and the flow line through the inlet and outlet ports to create a flow circuit between the inlet port and the outlet port; and performing an in-situ flow test of the formation using the created flow circuit; wherein an invaded zone in the formation acts as a barrier to fluid flow into the borehole along the flow circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method of sampling fluid from a formation penetrated by a borehole, comprising:
-
positioning in the borehole a downhole tool comprising a flow line, an inlet port configured to pass fluid from a first point in the formation into the flow line, and an outlet port configured to pass fluid from the flow line into a second point in the formation; arranging the inlet port and the outlet port such that they are sufficiently close to create a substantially closed loop circulation circuit through the rock formation, the inlet port, the flow line, and the outlet port; and performing an in-situ flow test of the formation using the substantially closed loop circulation circuit; wherein an invaded zone in the formation acts as a barrier to fluid flow into the borehole. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
Specification