DUAL ACTION VALVE INCLUDING A BUILT IN HYDRAULIC CIRCUIT

摘要

A VALVE (10) FOR USE DOWNHOLE IN A WEILBORE (B) CAN BE REPEATEDLY OPENED AND CLOSED ANY NUMBER OF TIMES IN RESPONSE TO A PRESSURE SIGNAL TRANSMITTED DOWN THE ANNULUS OF THE WELLBORE (B). THE VALVE (10) IS SET AND CHANGES FROM A FIRST POSITION TO A SECOND POSITION IN RESPONSE TO A FIRST PRESSURE SIGNAL TRANSMITTED DOWN THE ANNULUS, A PRESSURE VALUE OF THE FIRST PRESSURE SIGNAL TRANSMITTED DOWN THE ANNULUS BEING GREATER THAN A PRESSURE VALUE OF A PRESSURE EXISTING IN AN INSIDE ANNULAR SPACE (56) OF THE VALVE (10) BY AN AMOUNT AT LEAST EQUAL TO A PREDETERMINED VALUE. THE VALVE (10) RESETS ITSELF AND CHANGES BACK FROM THE SECOND POSITION TO THE FIRST POSITION IN RESPONSE TO A SECOND PRESSURE SIGNAL TRANSMITTED DOWN THE ANNULUS, THE PRESSURE VALUE OF THE PRESSURE EXISTING IN THE INSIDE ANNULAR SPACE (56) OF THE VALVE (10) BEING GREATER THAN A PRESSURE VALUE OF THE SECOND PRESSURE SIGNAL TRANSMITTED DOWN THE ANNULUS BY AN AMOUNT AT LEAST EQUAL TO THE PREDETERMINED VALUE. (FIGURE 2).