Abstract: A tool for forming a valve seat within a well that is capable of catching an obstruction will prevent flow of fluid downstream of the seat. According to one embodiment of the invention, the seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. In another embodiment, the sleeve acts as a stop for a secondary valve seat which catches the obstruction. In yet another embodiment, only a portion of the sleeve is expanded and an inlet portion of the sleeve includes a valve seat.

Abstract: A tool for forming a valve seat within a well that is capable of catching an obstruction will prevent flow of fluid downstream of the seat. The seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. The sleeve acts as a stop for a secondary valve seat which catches the obstruction.

Abstract: A tool for forming a valve seat within a well that is capable of catching an obstruction will prevent flow of fluid downstream of the seat. According to one embodiment of the invention, the seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. In another embodiment, the sleeve acts as a stop for a secondary valve seat which catches the obstruction.

Abstract: A tool for forming a valve seat within a well that is capable of catching an obstruction will prevent flow of fluid downstream of the seat. The seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. The sleeve acts as a stop for a secondary valve seat which catches the obstruction.

Abstract: A tool for forming a valve seat within a well that is capable of catching an obstruction will prevent flow of fluid downstream of the seat. According to one embodiment of the invention, the seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. In another embodiment, the sleeve acts as a stop for a secondary valve seat which catches the obstruction.

Abstract: A method for treating a well includes positioning a seat within the well that is capable of catching an obstruction which will prevent flow of fluid downstream of the seat. The seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. The sleeve may also act as a stop for a secondary valve seat which catches the obstruction. The casing uphole of the seat is perforated so that fluid under pressure will enter the formation surrounding the perforations. The process is particularly useful for fracing a formation in a horizontal well where numerous stages are required to complete the stimulation of the well. There is also potential application in vertical wells.

Abstract: A method for treating a well includes positioning a seat within the well that is capable of catching an obstruction which will prevent flow of fluid downstream of the seat. According to one embodiment of the invention, the seat is formed by expanding a sleeve with a ring positioned around its periphery or as a subsequent step in the process. As the sleeve is expanded over the ring, the seat is formed. Once the seat is formed, an obstruction in the form of a ball or dart is dropped down to the seat. In another embodiment the sleeve acts as a stop for a secondary valve seat which catches the obstruction. The casing uphole of the seat is perforated so that fluid under pressure will enter the formation surrounding the perforations. The process is particularly useful for fracing a formation in a horizontal well where numerous stages are required to complete the stimulation of the well. There is also potential application in vertical wells.

Abstract: A tool for forming an obstruction in the production casing of an oil or gas well includes a sleeve adapted to be secured to the casing and having an annular abutting surface that captures a body or a cage having a solid body within the casing thereby forming an obstruction. The tool may be secured within the well either by an expandable sleeve or a collet having resilient fingers. The tool may be used as a plug to prevent flow through the production casing of the well in a well treatment process such as fracing. A process for treating a well using the tool is also presented.