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Multiple Actuation High Pressure control Valve System for Functioning a Downhole Piston

IP.com Disclosure Number: IPCOM000128969D
Publication Date: 2005-Sep-23
Document File: 2 page(s) / 10K

Publishing Venue

The IP.com Prior Art Database

Abstract

Introduction: The challenge is to develop a downhole hydraulic control valve system to alternately direct fluid pressure from the high pressure region to one side of a piston and the opposite side of the piston will be connected to the low pressure region. The high pressure will first be directed to one side of the piston and then the other side, with the low pressure directed to the opposite side of the high pressure. The high pressure region can be up to the desired operating pressure of the system and the low pressure region can have a pressure of zero to any valve under the high pressure region. The first of the 3 way – 2 position valves controls which side of the piston the high pressure region is connected. The second valve controls which side of the piston the low pressure region is connected. The full differential pressure (the differential between the high and low pressure regions) is held by each of the two 3 way – 2 position valves of the control valve system. When the valves are operated the full differential pressure is instantaneously released. Substantial force and length of travel can be accomplished by the sizing of the piston area and the length of the supporting components. Problem with Prior Art – Current Technology: Current methods to control pressurized fluid require the use of elastomer or polymer seals to dynamically release the pressure with the full differential across the seal. All of the seal materials that have been tested to date get cut by the fluid flow resulting from the release of this high differential. Achieving multiple cycles, forward and backward movement of the piston, consistently and for the required number of cycles limits the current method. The current design functions at 5,000 psi differential for a limited time (20 cycles) and is non-functional at 7,500 psi or above (1-2 cycles). Objective: The objective is to develop a hydraulic control valve system which functions reliably and for an indefinite number of cycles over a full 15,000 psi differential. Potential Applications: There is currently an application for this control valve system in the TTTCP Telemetry Controlled Actuator Module. The design could also be installed in any situation that requires multiple open and closings in down hole tools. The new design and the previous design are all small diameter assemblies capable of fitting into annular spaces in downhole tools. Advantages of New Approach: The new design offers a reliable, functional alternative to the existing hydraulic control valves. The valve system has functioned at 15,000 psi for a total of 80 cycles, where the previous valves were limited to 1-3 cycles. Preferred Embodiment: They hydraulic control valve system is pressure limited by the actuation devices' maximum force output which is necessary to counteract the force generated within the valve at full fluid pressure. The pressure rating is currently 15,000 psi due to the limited availability of small diameter actuation devices. The termperature rating is also only limited by the actuation device. The valves can be actuated by motor assemblies in conjunction with a helical spring to provide the necessary instantaneous actuation. The preferred method of operation requires solenoid devices capable of 150 lbs. load over .060" travel. The described valve and solenoid assemblies would be installed in a manifold assembly designed to make all the proper hydraulic connections required by the system. Experimental Proof: The new design has been tested using two pneumatic cylinders to operate the two valves with great success at room temperature and 15,000 psi, 80 cycles were completed with minimal damage to the static o-ring seals and no damage to the metal valve seats. Temperature tests are pending the delivery of the necessary solenoid devices.

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Title: Multiple Actuation High Pressure control Valve System for Functioning a Downhole Piston

Introduction: The challenge is to develop a downhole hydraulic control valve system to alternately direct fluid pressure from the high pressure region to one side of a piston and the opposite side of the piston will be connected to the low pressure region. The high pressure will first be directed to one side of the piston and then the other side, with the low pressure directed to the opposite side of the high pressure. The high pressure region can be up to the desired operating pressure of the system and the low pressure region can have a pressure of zero to any valve under the high pressure region. The first of the 3 way - 2 position valves controls which side of the piston the high pressure region is connected. The second valve controls which side of the piston the low pressure region is connected. The full differential pressure (the differential between the high and low pressure regions) is held by each of the two 3 way - 2 position valves of the control valve system. When the valves are operated the full differential pressure is instantaneously released. Substantial force and length of travel can be accomplished by the sizing of the piston area and the length of the supporting components.

Problem with Prior Art - Current Technology: Current methods to control pressurized fluid require the use of elastomer or polymer seals to dynamically release the pressure with the full differential across the seal. All of the seal materials that have been tested to date get cut by the fluid flow resulting from the release of this high differential. Achieving multiple cycles, forward and backward movement of the piston, consistently and for the required number of cycles limits the current method. The current design functions at 5,000 psi differential for a limited time (20 cycles) and is non-functional at 7,500 psi or above (1-2 cycles).

Objective: The objective is to develop a hydraulic control...