| CPC E21B 34/063 (2013.01) [E21B 34/108 (2013.01); E21B 47/06 (2013.01); E21B 2200/08 (2020.05)] | 34 Claims |
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1. A port sub comprising:
a wall having defined therein a standard flow port and a control flow port;
an interior passage defined by the wall;
a low-pressure port assembly disposed in the standard flow port, the low-pressure port assembly comprising:
a low-pressure inner layer having a first rupture pressure; and
a low-pressure outer layer, at least a portion of the low-pressure outer layer being spaced apart from the low-pressure inner layer to define a first chamber therebetween;
a high-pressure port assembly disposed in the control flow port, the high-pressure port assembly
comprising:
a high-pressure inner layer having a second rupture pressure, the second rupture pressure being greater than the first rupture pressure;
a high-pressure outer layer configured to rupture immediately after rupturing of the high-pressure inner layer, at least a portion of the high-pressure outer layer being spaced apart from the high-pressure inner layer to define a second chamber therebetween;
the low-pressure port assembly is disposed in a closed configuration and is transitionable from the closed configuration to an open configuration, via a low-pressure port opening-ready configuration;
while the low-pressure port assembly is disposed in the closed configuration, the low-pressure inner layer and the low-pressure outer layer are intact such that there is an absence of flow communication between the inner passage and an environment external to the port sub wall, via the standard flow port;
while the low pressure port assembly is disposed in the low-pressure port opening-ready configuration, the low-pressure inner layer is defeated, while the low-pressure outer layer remains intact such that the low pressure outer layer is in flow communication with the inner passage while flow communication from the inner passage to the environment external to the port sub wall is prevented by the low pressure outer layer; and
while the low pressure port assembly is disposed in the open configuration, the low-pressure outer layer is defeated such that flow communication between the inner passage and the environment external to the port sub wall, via the standard flow port is established;
and
the high-pressure port assembly is disposed in a closed configuration and is transitionable from the closed configuration to an open configuration;
while the high-pressure port assembly is disposed in the closed configuration, there is an absence of flow communication from the inner passage to the environment external to the port sub wall, via the control flow port;
while the high pressure port assembly is disposed in the open configuration, the high pressure inner layer and the high pressure outer layer are defeated such that flow communication from the inner passage to the environment external to the port sub wall, via the control flow port is established;
wherein:
the low-pressure port assembly and the high-pressure port assembly are co-operatively transitionable from a co-operating sealed configuration to a co-operating opening-effective configuration, wherein:
(i) in the co-operating sealed configuration, the low-pressure port assembly is disposed in the closed configuration and the high-pressure port assembly is disposed in the closed configuration; and
(ii) in the co-operating opening-effective configuration, the low-pressure port assembly is disposed in the low-pressure port assembly opening-ready configuration and the high pressure port assembly is disposed in the open configuration, such that: (i) while the port sub is emplaced within a wellbore, (ii) the co-operating opening-effective configuration is established, and (iii) a degradation-promoting agent is being supplied to the interior passage:
the degradation-promoting agent becomes emplaced, within the inner passage of the port sub in communication with the low-pressure outer layer of the low pressure port assembly; and
the degradation-promoting agent becomes emplaced, externally of the port sub wall, in communication with the low-pressure outer layer of the low-pressure port assembly, with effect that degradation of the low-pressure outer layer is effected by the degradation-promoting agent.
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