Dual function downhole tool

摘要

The present invention relates to a multifunctional downhole wireline tool (1) for fluid sampling and fluid jetting in a well (2) downhole, comprising a pump (4) having a pump opening (5), and a fluid chamber (6) for collecting a sample of fluid (3) or storage of fluid (3) to be jetted, the fluid chamber having a first chamber end (7) connected with the pump opening and a second chamber end (8) having a chamber opening, wherein the fluid chamber having a chamber wall (10) comprises a first piston (11) and a second piston (12) dividing the fluid chamber into a first chamber section (13), a second chamber section (14) and a third chamber section (15), the first piston being connected with a first end (16) of a first piston rod (17), the second piston being connected with a first end (18) of a second piston rod (19), a first support (20) arranged along the first piston rod, a second support (21) arranged along the second piston rod, and a first spring (22, 22a) provided between the first piston and the first support and another first spring (22, 22b) provided between the second piston and the second support, so that when the pump provides a pressure difference over the pistons, the pistons are forced in one direction, hence activating a spring force of the first springs and allowing the fluid to flow from one chamber section to another chamber section. The present invention further relates to a downhole system for fluid sampling and fluid jetting in a well downhole and to a sampling method and a jetting method using a multifunctional downhole wireline tool according to the present invention.