This paper summarizes the design, selection, installation and operational aspects of hydrocarbon miscible flood field facilities. Field facilities discussed include solvent and gas, fresh and produced water injection pipelines, double block and bleed system, and injection wellhead. The piping design for high pressure injection system is described to explain the economics of selection of high grade pipe.

In a cyclic miscible injection system, hydrate formation is the main operational problem. This paper presents the rationale for selection of the unique design of double block and bleed system. The simplicity of this design has reduced operating costs. The techniques involved in switching the cycles from solvent injection to water and vice versa are described.

Field facilities pressure testing has always been an outstanding question, especially for miscible injection lines. Water, gas and methanol as test media are evaluated.

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