초록 ▼

An apparatus T1 for sealing a well tubing 12 including a housing 20, 21, 22 which has a channel 68 communicating with the bore of tubing 12 and a chamber 43 connected with channel 68. A seal 62 is slidably mounted in the housing and is disposed in a retracted open condition in chamber 43 to enable f

An apparatus T1 for sealing a well tubing 12 including a housing 20, 21, 22 which has a channel 68 communicating with the bore of tubing 12 and a chamber 43 connected with channel 68. A seal 62 is slidably mounted in the housing and is disposed in a retracted open condition in chamber 43 to enable fluid flow through channel 68. AN actuator 41, 42 also disposed in chamber 43, includes a shape memory alloy material which is responsive to the temperature thereof rising to a predetermined level corresponding to the transition temperature of the shape memory alloy for transforming in shape to extend the seal into an extended condition within channel 68, thereby blocking fluid flow therethrough.

대표청구항 ▼

Apparatus for sealing a well tubing bore comprising: a housing including channel means for communicating with said tubing bore and a chamber connected to said channel means; sealing means slidably mounted within said housing and disposable in a retracted open condition in said chamber to enable flui

Apparatus for sealing a well tubing bore comprising: a housing including channel means for communicating with said tubing bore and a chamber connected to said channel means; sealing means slidably mounted within said housing and disposable in a retracted open condition in said chamber to enable fluid flow through said channel means; and actuator means disposed in said chamber and including a shape memory alloy material responsive to the temperature thereof rising to a predetermined level corresponding to the transition temperature of said shape memory alloy for transforming in shape to extend said sealing means into a sealing contact within said channel means thereby blocking fluid flow therethrough; said channel means including a concave portion and said sealing means including a distal end having a complementary convex surface for conformably fitting said concave portion when said sealing means are extended. Apparatus for sealing a well tubing bore comprising: a housing including channel means for communicating with said tubing bore and a chamber connected to said channel means; sealing means slidably mounted within said housing and disposable in a retracted open condition in said chamber to enable fluid flow through said channel means; actuator means disposed in said chamber and including a shape memory alloy material responsive to the temperature thereof rising to a predetermined level corresponding to the transition temperature of said shape memory alloy for transforming in shape to extend said sealing means into a sealing contact within said channel means thereby blocking fluid flow therethrough; and means for locking including first ratchet means disposed axially in said chamber, complementary second ratchet means opposing said first ratchet means, radially resilient means connecting said second ratchet means to said first side of said slidable connector and urging said second ratchet means to slide over said first ratchet means as said sealing means is extended and lock with said first ratchet means when said actuator means is cooled to resume an untransformed shape.