Abstract In the method, a perforating device equipped with perforation forming means is lowered through a conventional tubing string and locked with a collar recess at a predetermined subsurface location. On a second trip, a remotely operable actuating device is lowered into engagement with the perforating device and operated to actuate the perforating device which in turn forms perforations through the wall of the surrounding tubing string. On the return leg of the second trip, the perforating device is unlocked and removed from the tubing string along with the attached actuating device. On a third trip, a gas lift valve is lowered through the tubing and anchored with the same collar recess to provide regulated valving of fluids flowing through the perforations. The system includes a perforating device and a separate actuating device. The actuating device is lowered into engagement with the perforating device following locking of the perforating device with a subsurface collar recess. The actuating device is surface operated to ignite a charge carried in the perforating device which produces a cutting jet stream to form perforations in the surrounding tubing string. The perforating and actuating devices are locked together for removal as a unit. The system includes a gas lift valve provided with radially movable collar recess anchoring members and axially spaced, self expanding seal members for respectively anchoring the valve with the collar recess and providing a seal above and below the perforations whereby the valve regulates the flow of fluids through the perforations.
A method of providing gas lift valves in a conventional tubing string comprising the steps of: a. on a first trip, lowering a perforating device equipped with perforating means through said tubing string and locking said perforating device within said tubing string; b. on a second trip, lowering a remotely operable actuating device into engagement with said perforating device, actuating said perforating device to cause said perforating means to form one or more perforations in said tubing string, releasing said perforating device from said tubing string and thereafter recovering both said actuating device and said perforating device from said tubing string; and c. on a third trip, lowering a gas lift valve means into said tubing string and anchoring said gas lift valve means into said tubing string and anchoring said gas lift valve means in said tubing in pressure communication with said one or more perforations.
Claim 2
Independent Claim
147 words
A method of providing gas lift valves in a conventional tubing string comprising the steps of: a. on a first trip, lowering a perforating device equipped with perforating means through said tubing string and locking said perforating device within said tubing string; b. on a second trip, lowering a remotely operable actuating device into engagement with said perforating device, actuating said perforating device to cause said perforating means to form one or more perforations in said tubing string, releasing said perforating device from said tubing string and thereafter recovering both said actuating device and said perforating device from said tubing string; and c. on a third trip, lowering a gas lift valve means into said tubing string and anchoring said gas lift valve means into said tubing string and anchoring said gas lift valve means in said tubing in pressure communication with said one or more perforations.
Claim 3
Dependent Claim
48 words
A method as defined in claim 1 wherein: a. said perforating device is anchored with a given collar recess formed between mating tubing sections; and b. said gas lift valve means is anchored with said collar recess after formation of said perforations and removal of said perforating device.