Methods and tools to deploy downhole elements

A method to operate a tool to set a downhole element, the method comprising:

• deploying a tool into a borehole that is drilled through a formation, the tool comprising:
• one and only one device mounted on the housing and operable to actuate in response to being subject to a threshold amount of pressure to provide fluid flow into the tool;
• a first piston having a first cross-sectional area and a first stroke length;
• and
• a second piston having a second cross-sectional area and a second stroke length;
• flowing fluid through the one and only one device;
• actuating the first piston by applying a first amount of force to the first piston;
• actuating the second piston by applying a second amount of force to the second piston,
• wherein the second amount of force is generated by an actuation of the first piston;
• and applying a force generated by an actuation of the second piston to set an element deployed proximate the second piston, wherein the first amount of force generates a first amount of pressure to the second piston, and wherein the second amount of force generates a second amount of pressure to the element, and wherein the first amount of pressure is less than the second amount of pressure, and wherein fluid flow through the one and only device causes the force generated by the actuation of the second piston to set the element.

A method to hydrostatically set a downhole element, the method comprising:

• flowing fluid through one and only one device to provide fluid flow into a tool;
• applying a first hydrostatic force to a first piston to actuate the first piston, wherein the first piston and a second piston are both deployed in a borehole, wherein the first piston has a first cross-sectional area and wherein the second piston has a second cross-sectional area that is less than the first cross-sectional area;
• applying a second hydrostatic force to the second piston, wherein the second hydrostatic force is generated by an actuation of the first piston;
• and
• applying a force generated by an actuation of the second piston to set a downhole element that is deployed proximate the second piston,
• wherein the first hydrostatic force generates a first amount of pressure to the second piston, and wherein the second hydrostatic force generates a second amount of pressure to the element,
• and wherein the first amount of pressure is less than the second amount of pressure and wherein fluid flow through the one and only one device causes the force generated by the actuation of the second piston to set the downhole element.