Optimising Saudi production

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Figure 1.

The production results and production logs from the wells showed sustained high rate dry oil production and delayed water/gas breakthrough compared to offset wells. By means of reservoir simulations, a better sweep efficiency and ultimate recovery became possible with this type of completion in both sandstone and fractured carbonate reservoirs.

Used in conjunction with Equalizer/Mpas, an interventionless InForce IWS valve is hydraulically operated from surface to control the flow of gas injection without the need for surface infrastructure, a key feature in maximizing reservoir recovery.

The InForce HCM-A GL multiposition gas lift valve is positioned across the gas zone to assist in artificially lifting the hydrocarbons by injecting gas into the system.

The seal system is isolated from high flow rate erosion, and the dual diffuser ring system protects primary seals during opening and flowing operations. The port section of the sleeve and housing are designed for high erosive flow resistance by utilizing tungsten carbide components.

The valve's gas-tight non-elastomeric and metal-to-metal sealing technology ensures sealing integrity under extreme conditions. The valve is actuated from surface without the need for intervention when the well cannot flow through its own energy.

Figure 1 details the overall design of the two independent systems in a sample open-hole section of about 3,700 ft. Of this section, 1,300 ft is the upper gas zone and the remainder is the lower oil producing zone.

The 4-1/2 in Equalizer/MPas system (items 26-38) is deployed on an off-bottom cemented liner deployment kit (9-16). From the bottom up, this deployment kit carries evenly-spaced Equalizers into four compartments across the oil zone with 4-1/2 in MPas packers to isolate zones in the 6-1/8 in open-hole.

Above the first packer separating the oil zone (item 25), blank tubing is installed (24) followed by a second packer (23) that serves as a dual barrier from the gas zone.

This second packer ties back the upper IWS completion, allowing the gas to flow in an inner tubing annulus. The gas is allowed to flow through the 4-1/2 in Excluder^TM screens (18-20) installed across the gas zone.

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