Abstract: A method is disclosed that allows for sequential treatment of two zones in a single trip while isolating the zones. A fluid loss valve prevents the column of fluid in the tubing from flowing into the lower formation until activated. Zone isolation is accomplished by manipulation of a port on a wash pipe attached to the crossover assembly.

Abstract: A crossover tool is disclosed that permits access through to the wash pipe below after the conclusion of a known gravel packing operation. A ball is trapped to a sleeve after shifting it so as to allow flow through the crossover for acid treatment in the screen area and a reversing out procedure to remove excess acid. Alternatively, pressure delivered through the wash pipe can operate packers, as part of a gravel packing procedure as outlined in two steps in U.S. Pat. No. 6,311,772 is a single trip. The acid treating or other downhole operation through the wash pipe can also be accomplished in a single trip with the gravel packing assembly.

Abstract: The apparatus includes a gravel pack assembly comprising a gravel pack body and a crossover tool. The gravel pack body comprises a pressure set packer, one or more production screens and a plurality of axial position indexing lugs. The crossover tool comprises auxiliary flow chambers, packer by-pass channels, a crossover tool check valve and an axial position indexing collet. The gravel pack body and crossover tool are assembled coaxially as a cooperative unit by a threaded joint and the unit is threadably attached to the bottom end of a tool string for selective placement within the wellbore. Set of the packer secures the gravel pack body to the well casing and seals the casing annulus around the gravel pack assembly.

Abstract: The apparatus includes a gravel pack assembly comprising a gravel pack body and a crossover tool. The crossover tool comprises auxiliary flow chambers and channels around a casing packer and a crossover tool check valve. The gravel pack body and crossover tool are assembled coaxially as a cooperative unit by a threaded joint. The assembly is threadably attached to the bottom end of a tool string for selective placement within the wellbore. Set of the packer secures the gravel pack body to the well casing and seals the casing annulus around the gravel pack assembly. After setting the packer, the tool string is rotated to release the threaded assembly joint between the crossover tool and the gravel pack extension. The desired flow function is determined by selective axial positionment of the crossover tool within the gravel pack body. When the gravel pack is in place, the crossover tool is axially positioned to flush residual aggregate from the tool string bore.

Abstract: A technique for providing auxiliary conduits in multi-trip completions is disclosed. The technique has particular applicability to liner mounted screens which are to be gravel packed. In the preferred embodiment, a protective shroud is run with the gravel pack screens with the auxiliary conduits disposed in between. The auxiliary conduits terminate in a quick connection at a liner top packer. The gravel packing equipment can optionally be secured in a flow relationship to the auxiliary conduits so as to control the gravel packing operation. Subsequent to the removal of the specialized equipment, the production tubing can be run with an auxiliary conduit or conduits for connection down hole to the auxiliary conduits coming from the liner top packer for a sealing connection. Thereafter, during production various data on the well can be obtained in real time despite the multiple trips necessary to accomplish completion.

Abstract: A completion assembly facilitates gravel-packing and fracturestimulation of closely spaced zones. The assembly includes a pair of spaced screens with a production packer in between. The production packer has a short bypass flowpath therethrough to allow fluids carrying the gravel to pass the production packer so that the upper and lower zones can be gravel-packed simultaneously, as well as fracture-stimulated simultaneously. Thereafter, the presence of the gravel in the bypass tube in the packer between the zones provides some limited isolation based on the permeability of the gravel found in the bypass passage and the pressure drop across that passage. Production then can follow from the lower zone, the upper zone, or both zones depending on the completion configuration.

Abstract: The present invention provides apparatus and method for gravel packing open holes wherein hydrostatic pressure is maintained above the formation pressure (“overburdened condition”) throughout the gravel pack process. The apparatus includes a completion string which contains a flow restriction device, a crossover device and a packer each above and below the crossover device. The string is set in the wellbore with the flow restriction device adjacent the producing formation. The upper packer and the crossover device are set, which allows the gravel fluid to pass to the annulus, and return through the string. After gravel packing, the lower packer is set. The crossover device and the upper packer are retrieved from the wellbore leaving the flow restriction device and the lower packer in the wellbore. The system maintains the wellbore under overburdened condition throughout the gravel packing process.

Abstract: An apparatus and method is provided that allows an operator to drill a well into a formation requiring treatment or gravel packing in a single pass, then to lower and position the liner and production strings simultaneously. The invention allows cementing of the liner prior to any treatment or gravel packing, and provides an integral circulation system to allow formation treatment or gravel packing of the production string. Once treatment or gravel packing is completed, the invention provides mechanical fluid loss control as the circulation system is pulled out of the hole.