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Novel reservoir conformance control method in gas fields: fundamentals and field studies

Lakatos L., Lakatos-Szabo J., Szentes G., Jobbik A., Vago A., Karaffa Z.

Prace Naukowe Instytutu Nafty i Gazu

2016

nr 209 wyd. konferencyjne

71--75

The primary aim of the research project was to develop an efficient technology to control excessive water production in gas wells. As a novelty, water sensitive organic-based solutions were developed, which spontaneously form extremely high viscosity barrier under reservoir condition when contacting with water. In 2012, the technology was deemed to be matured for pilots in gas field locating above a depleted oil reservoir. Until now, 18 active wells were treated with the self-conforming microemulsions including several repeated jobs. Analyzing the production history of wells, the detrimental water production was the primary factor selecting the target wells to be treated. The water production in some wells dropped significantly; meanwhile the gas production increased. Surprisingly, all treated wells, never producing liquid hydrocarbons earlier, started to produce substantial amount of oil (between 10 and 75% oil in net fluid rate). These positive results could be attributed to three different reasons: effective barrier formation against water influx, reducing skin factor caused by formation damage, and opening new flow paths from entrapped oil bodies exiting below the gas cap. Thus, the treatments were qualified as “multifunctional well stimulation” in contrast to the original term of “water shutoff treatment”. Based on the encouraging field results the technology became one of the strategic projects of the company in the coming years until 2020.