Abstract: The present invention relates to burst port subs (BPS) 120 allowing for a tubing 100 or a liner 200 or a casing 200 in a borehole 300 to be opened at a predetermined pressure and further providing a delayed opening sequence due to a dissolvable barrier 400, 500 arranged in a port 440, 540 of the sub 120. The present invention relates further to a downhole system comprising a predetermined number of such burst port subs (BPS) 120.

Abstract: It has been found that in many instances it is desirable to be able to determine where fluid in a well originates. To that end a tracer assembly is provided where the tracer assembly becomes a portion of the tubular that is run into the wellbore. Preferably the tracer assembly provides an exterior barrier whether permanent or temporary to fluid flow outside of the tubular and also provides an interior barrier to fluid flow as it passes through the inner bore of the tubular. The interior barrier is adjustable so that upon command it provides access from the interior of the tubular to at least a portion of a cavity within the tracer assembly. The cavity is provided with a tracer or tracers so that as fluid is allowed within the interior cavity portion of the tracer is eroded, dissolved, or otherwise mixed with the fluid and the tracer that is now mixed with the fluid is transported to the surface.

Abstract: In order to overcome the limitation of being able to utilize a limited number of sliding sleeves with progressively more restrictive internal diameters in a particular wellbore when selectively opening the sliding sleeve or tool with progressively smaller balls or darts, an indexing dart may be utilized. A wellbore dart or pill is provided such that each time the dart passes through a downhole tool having a seat and externally extending finger is forced radially inward into the dart. As the finger moves inward to its depressed position, the finger moves a ball or other placeholder from a first position to a second position. When the ball is moved to the second position it may be released into the interior of the wellbore or it may be released into a chamber in the tool. In any event the ball is moved to a second position such that it may not return to the first position when the finger returns from its depressed position to its extended position.

Abstract: A re-closable toe sleeve is disclosed where the toe sleeve has a port allowing fluid access from the interior of the toe sleeve to the exterior of the toe sleeve. A burst disk is placed inside the port to prevent fluid access from the interior of the toe sleeve to the exterior of the toe sleeve. However upon the fluid in the interior of the toe sleeve reaching a predetermined level the burst disk is removed or otherwise modified to allow fluid access through the port. A sliding sleeve is placed within the toe sleeve so that the sliding sleeve can be moved to cover the port thereby preventing fluid access from the interior of the toe sleeve to the exterior of the toe sleeve or the sliding sleeve may be moved to uncover the port thereby allowing fluid access from the interior of the toe sleeve to the exterior the toe sleeve. The sliding sleeve is mechanically moved from the surface and is typically run into the well in the open position such that the port is uncovered by the sliding sleeve.