Injection Completion and Well Integrity Performance of First Cyclic Steam Stimulations to Horizontal Wells in the Huyaparí Field

López, A. (Chevron) | Sanchez, R. (PDVSA) | Pacheco, J. (PDVSA)


The first thermal pilot project in the Huyaparí field (formerly Hamaca) in the Orinoco Belt in eastern Venezuela was designed to use'nonthermal' wells in an existing cold producing field to explore steam stimulation injection and production response while maintaining wellbore integrity and safe operations. The pilot project consisted of performing cyclic steam stimulations in active horizontal producers. The selected candidates were active wells producing extra heavy crude oil (8-9 API) from prolific unconsolidated sands with 30% porosity and 5 Darcy permeability. A selection process was implemented to identify wells based on favorable sand quality and dynamic reservoir conditions to address potential issues of relatively high-pressure high-temperature saturated steam injection conditions. A risk analysis was implemented to design the injection completion and workover program to maintain well integrity during high-temperature steam injection (550 F). Well injection completion consisted of concentric vacuum-insulated-tubing (VIT), thermal hydraulic-set packer, thermal wellhead conversion, and high temperature downhole sensors; all designed to protect Class B cement and 9.625-in.