Patent ID: 8276668
Filing Date: 2012-10-02
Classification: E21B

Abstract:
1. A method of cleaning a subsurface well, comprising: running a multi-channel tool string comprising an adapter on a first end of the tool string and a guide device at a second end of the tool string into the well before the guide device permits the well to be flushed, the tool string having at least two channels extending from the first end of the tool string to the second end of the tool string, the guide device comprising a pressure-controlled valve that controls fluid communication between the at least two channels of the tool string and the well, wherein the guide device is in an open position to permit the well to be flushed when the pressure-controlled valve is open, wherein the pressure-controlled valve is configured to open in response to a select pressure of a fluid pumped down the tool string; activating the guide device to permit the well to be flushed; supplying fluid through one of the at least two channels in connection with the tool string; and transporting fluids and particles from the well back to the surface through the other of the at least two channels in connection with the tool string; wherein an extension pipe which was attached to the tool string when the tool string was run into the well is released and left in the well before the tool string is withdrawn from the well for sealing the wall of the well.