Oil production increased in two test wells in a mature oil reservoir in Mann Field, Myanmar by successfully applying an enzyme-enhanced oil recovery (EEOR) process, a subset of microbial-enhanced oil recovery. A concentrated, water-soluble enzyme preparation made from DNA-modified proteins released from selected microbes was specifically prepared and injected in oil zones of one well and then recycled and applied in a second well.

Mann Field is a brownfield located in Salin sub-basin of the central basin of Myanmar in Southeast Asia and currently is operated by MOGE, with MPRL E&P Pte Ltd as the contractor for the field operations management. The field began producing in 1970, predominately from Oligocene reservoirs that consist of 26 stacked sandstone payzones. More than 667 wells have been drilled and completed, and 118 million stock tank barrels of oil have been produced. Average porosity of the field is 18% with an average permeability of 10–250 md. Oil gravity is typically 36.5°API, which is paraffinic in certain horizons, and the gas gravity is 0.65.

A test well was treated with four drums of enzyme concentrate diluted to 2% in formation compatible, filtered brine. Pretreatment production was 14 bopd and 2 bwpd. Current production is 18 bopd, and some 530 incremental barrels have been produced in 13 months following the 11,000 galtreatment. Pretreatment production from the second well was 10 bopd and 109 bwpd. Current production is 16 to 17 bopd, and approximately 1636 barrels of incremental oil has been produced during nine months since the treatment. Additional enzyme treatments are being designed for wells in Mann Field with higher current oil productivities.

There are unlimited targets for EEOR applications, not only in Myanmar, but throughout the world. These successful initial EEOR applications in Mann Field will allow for treatment design improvements in future wells.

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