Combination Control and Relief Valve
Publication Date: 2016-Sep-14
The IP.com Prior Art Database
A shear seal valve that can act as both a control or relief valve due to it's ability to be actuated either actively (controlled input) or passively (uncontrolled input).
Title: Combination Control and Relief Valve
Abstract: A shear seal valve that can act as both a control or relief valve due to it's ability to be actuated either actively (controlled input) or passively (uncontrolled input).
Description: A common control valve in downhole sampling tools is known as a "borehole exit" valve which has many purposes including: allowing well pressure into the tool to eliminate stresses from large pressure differentials, allowing an exit path for dirty fluid to be cleaned from the tool before pumping sample into the tanks, and allowing (when closed) formation pressure to build and enter the tanks during pumping. These tasks can occur at any time, therefor the valve needs control over whether it opens or closes. There are many potential methods this can be accomplished with, for example, in this OLID, the sleeve rests on the outside of the primary stem, however that doesn't have to be the case. Additionally, in this OLID, the primary stem is actuated by a motor, however this could be actuated with different means (such as hydraulic pressure) as well. The novel feature of this design is that it uses a single valve which can be controlled actively (by the user) or passively, which gives it the capability to serve two different tasks that are very important to operation, thus, eliminating a valve entirely.