Failed ESP prompts recompletion of well four months later
In April 2012, an operator completed a well in a sandstone formation,
however, the ESP failed four months later. The well was recompleted in August
2012, producing at a much lower rate than prior to the workover and the
production continued to decline. Based on this decline, the operator determined
that the formation had been damaged during the workover and that fines
migration was also limiting production. Nearly one year after the well was
initially completed, the ESP was stopped because of overheating and the low
fluid level in the well.
Historically, stimulation treatments performed through
ESPs are usually unsuccessful because nonreactive fluids are used to avoid
damaging the ESP.
Chelant-based fluid system eliminates need for pre- and
OneSTEP GP fluid was selected to remove potential formation damage
caused by fines migration and to stabilize the clays to avoid further fines
migration. OneSTEP GP treating fluid is a chelant-based fluid system developed
specifically for stimulating sandstone reservoirs, as a standalone treating
fluid, eliminating the need for pre- and postflushes.
Stimulation through the
ESP was performed to minimize workover cost and time. The treatment waspumped
through CT, located just above the ESP.
OneSTEP GP fluid increased production by more than 100 bbl/d
Damage to the ESP was minimized by implementing the less corrosive
OneStep GP fluid with a pH level of 5.5, maximizing long-term production. The
matrix stimulation treatment was performed in only one stage, and required less
total volume when compared with conventional treatments,which require
preflushes and low-pH acidic fluids. As a result of the treatment, the operator
saved USD 280,000 in workover costs, the ESP performed as expected, and
production increased by 100 bbl/d.