Wellbottom fluid implosion treatment system
OwnerEmmet F. Briegerinventor
Life of this patent
Estimating the term…
Abstract
A system for inducing implosion shock forces on perforation traversing earth formations with fluid pressure where an implosion tool is selected relative to a shut in well pressure and a tubing pressure to have a large and small area piston relationship in a well tool so that at a predetermined tubing pressure the pistons move a sufficient distance to open an implosion valve which permits a sudden release of well fluid pressure into the tubing string and produces an implosion force on the perforations. A pressure gauge on the well tool records tubing pressure and well pressure as a function of time.
Claims15
Apparatus for use in a well bore for cleaning perforations traversing earth formations containing hydrocarbons under pressure and having a tubing string extending to a location proximate to the perforations and sealed with respect to the bore of the well;
- said apparatus including
- an implosion tool having selectively operable latching means for releasably locking the implosion tool in the tubing string,
- said implosion tool having a longitudinally extending flow passage;
- access ports in said tool for placing said flow passage in fluid communication with the exterior of the tool,
- a slidable valve sleeve disposed in said flow passage over said access ports and being pressure balanced in said flow passage, said access ports and said valve sleeve constituting an implosion valve;
- a large piston and a small piston slidably disposed in bores in said tool where the large piston is cooperable with said valve sleeve and the smaller piston is cooperable with said large piston, said large piston being in fluid communication with said flow passage and said small piston being in fluid communication with the formation pressure below the tool, said large piston and said small piston having an area relationship so that a predetermined tubing pressure with respect to a given shut in pressure can be used in moving said valve sleeve and in opening said access ports, and whereby said valve sleeve can be moved to open said access ports by controlling the pressure in the tubing string with respect to the shut in pressure of the well to develop an implosion fluid flow from the perforations when said access ports are first opened.
Apparatus for use in a well bore for cleaning perforations traversing earth formations containing hydrocarbons under pressure and having a tubing string extending to a location proximate to the perforations and sealed with respect to the bore of the well;
- said apparatus including
- an implosion tool having selectively operable latching means for releasably locking the implosion tool in the tubing string,
- said implosion tool having a longitudinally extending flow passage;
- access ports in said tool for placing said flow passage in fluid communication with the exterior of the tool,
- a slidable valve sleeve disposed in said flow passage over said access ports and being pressure balanced in said flow passage, said access ports and said valve sleeve constituting an implosion valve;
- a large piston and a small piston slidably disposed in bores in said tool where the large piston is cooperable with said valve sleeve and the smaller piston is cooperable with said large piston, said large piston being in fluid communication with said flow passage and said small piston being in fluid communication with the formation pressure below the tool, said large piston and said small piston having an area relationship so that a predetermined tubing pressure with respect to a given shut in pressure can be used in moving said valve sleeve and in opening said access ports, and whereby said valve sleeve can be moved to open said access ports by controlling the pressure in the tubing string with respect to the shut in pressure of the well to develop an implosion fluid flow from the perforations when said access ports are first opened;
- and
- coupling means connecting said valve sleeve to said large piston whereby said valve sleeve can move in conjunction with movement of said large piston, locking means on said coupling mean for releasably locking said valve sleeve against premature opening movement until said large piston has traveled a predetermined distance, said coupling means and said locking means permitting resetting of said valve sleeve to an initial condition.
A method for clearing debris from perforations in earth formations traversed by a well bore where the formations contain fluids under pressure and where a tubing string extends to a location proximate to the perforations and is sealed with respect to the bore of the well, said method including the steps of:
- disposing a well tool in releasably locked condition in the tubing string with a sealing means located above an implosion valve and where the implosion valve includes
- a longitudinally extending flow passage;
- access ports in said tool for placing said flow passage in fluid communication with the exterior of the tool,
- a slidable valve sleeve disposed in said flow passage over said access ports and being pressure balanced in said flow passage, where said access ports and said valve sleeve constitute the implosion valve;
- and further including
- a large piston and a small piston slidably disposed in bores in said tool where the large piston is cooperable with said valve sleeve and the smaller piston is cooperable with said large piston, said large piston being in fluid communication with said flow passage and said small piston being in fluid communication with the formation pressure below the tool, said large piston and said small piston having an area relationship so that a predetermined tubing pressure with respect to a given shut in pressure can be used in moving said valve sleeve and in opening said access ports;
- and
- reducing the pressure in the tubing string a predetermined pressure with respect to the shut in pressure of the well to move said large piston and said small piston so that the shut in pressure is suddenly applied to the valve sleeve to suddenly open the implosion valve.
The method as set forth in 13 wherein prior to reducing the pressure in the tubing string, a recording of static pressure in the tubing string and in the well bore is recorded, and wherein
- when the implosion valve is opened recording the dynamic pressure conditions in the tubing string and in the well bore as a function of time.
Dependencies are inferred from the claim text.