Patent ID: 8291980

Claim:
A tubular valving system, comprising: a tubular having a plurality of ports; a plurality of sleeves disposed at the tubular covering the plurality of ports; a plug runnable within the tubular being seatingly engagable with each of the plurality of sleeves such that attainment of a first pressure applied against the plug and a first of the plurality of sleeves causes movement of the first of the plurality of sleeves to thereby uncover at least one of the plurality of ports covered by the first of the plurality of sleeves, the first of the plurality of sleeves being yieldable to allow passage of the plug upon attainment of a second pressure applied thereagainst to allow the plug to move to be seatingly engagable with a second of the plurality of sleeves such that the second of the plurality of sleeves is movable in response to a third pressure being applied against the plug to uncover at least an additional one of the plurality of ports, the second of the plurality of sleeves being yieldable to allow passage of the plug upon attainment of a fourth pressure while seated thereagainst, the foregoing sequence being repeatable against a selected number of the plurality of sleeves; and occlusive members positioned and configured to occlude the plurality of ports while the plurality of ports are uncovered by the plurality of sleeves until a later time.