초록 ▼

Well bore completion method and apparatus which includes a perforating gun suspended from the end of a tubing string. A releasable coulping device is interposed between a stop means and the gun. When the releasable coupling is actuated, the gun, along with the lower marginal portion of the tubing st

Well bore completion method and apparatus which includes a perforating gun suspended from the end of a tubing string. A releasable coulping device is interposed between a stop means and the gun. When the releasable coupling is actuated, the gun, along with the lower marginal portion of the tubing string, is dropped to the bottom of the borehole. A special tool is run downhole and touches bottom, then raised to contact the stop means, to thereby enable a determination to be made regarding the feasibility of firing the gun. The tool is employed to fire the gun as well as to release the releasable coupling member. Provision is made by which the above sequence of operational steps may be interrupted at any time and the tool removed from the borehole.

대표청구항 ▼

In a well bore apparatus having a production string affixed to a packer device and extending downhole from the packer device to a perforating gun, with there being a releasable coupling member connecting the tubing together at a location between said gun and said packer, and with said gun having a f

In a well bore apparatus having a production string affixed to a packer device and extending downhole from the packer device to a perforating gun, with there being a releasable coupling member connecting the tubing together at a location between said gun and said packer, and with said gun having a firing head which is located within the interior of said tubing, the combination with said firing head and releasable coupling of a firing and releasing tool; said firing and releasing tool having a main body, a plurality of circumferentially extending dogs, and a retractable member which is connected to and downwardly extends from said main body; means mounting said dogs to said main body in such a manner that said dogs can be retracted into said main body to thereby permit uphole movement of the tool; a stop means positioned above said releasable coupling for engaging said dogs and arresting uphole movement of said tool; said releasable coupling having a releasing member therein for engaging said dogs so that the dogs of the tool can engage and move the releasing member when the tool is moved uphole; the distance measured from said releasable coupling to said gun head being shorter than the distance measured between said dogs and the lowermost end of said tool when the retractable member is extended, and being greater when the retractable member is retracted; so that said tool can be run downhole and touch bottom, with the dogs being located at an elevation which is intermediate said stop means and said releasable coupling, whereupon the tool can then be picked up so that the dogs engage said stop means to thereby determine the distance from the bottom of the hole to the stop means; and thereafter said tool can be run downhole to engage the firing head, or alternatively, the dogs can be retracted and the tool brought back to the surface of the ground. The method of completing a well bore comprising the steps of: locating a perforating gun downhole on the end of a tubing string and connecting the tubing string together with a releasable coupling device; placing a stop means in spaced relationship above said releasable coupling device; measuring the distance from said perforating gun to said stop means; running a firing tool downhole within the tubing string and touching bottom above the gun; lifting the firing tool uphole and engaging said stop means to measure the spaced distance between said bottom and said stop means; comparing the last measurement to the first measurement; firing the gun and subsequently releasing the releasable coupling member when the first and last measurements are equal to one another; removing the firing tool from the tubing string when the first and last measurements are unequal.