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Thursday, June 11, 2015

Asphaltene dispersant treatment program saves well from abandonment

Asphaltene dispersant treatment program saves well from abandonment

 
 
 
 
 
 
 
 
 
 
 
Oil production in an east Texas field had been on the decline for a number of years. The wells had been activated and hot oiled numerous times throughout their lives, with little production gain. Analysis of the oil revealed it contained 20% to 35% asphaltenes.

Baker Hughes recommended treatment with PAO72 asphaltene dispersant to stimulate production. "We targeted one well for the treatment program," says Graham F. Smith, product line manager for Baker Hughes Upstream Chemicals. "The pump was stopped, and 165 gallons of an aromatic solvent was pumped down the tubing. Then, 55 gallons of PAO72 asphaltene dispersant was diluted in 20 barrels of produced oil and pumped down the tubing, followed by a 12-barrel oil overflush."

The well was then allowed to soak for 12 hours. The following day, 80 barrels of produced oil were pumped down the tubing and the treatment was allowed to soak for an additional 24 hours. The following day, production was resumed.

"After its initial peak, the well's production leveled off at 600% above pretreatment levels," Smith says. "The PAO72 asphaltene dispersant treatment program enabled the well to continue to be viable and produce, instead of being abandoned."

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