The Bakken’s combination of high TDS (>250,000 mg/L), high calcium (>20,000 mg/L), high iron (>100 mg/L), and high temperatures (>250 °F) limits the amount of highly effective scale inhibitors. The use of scale inhibitors in frac jobs in the Bakken is common practice, as operators seek to control scale formation due to mixing of incompatible brines and self-scaling brines. Application during the frac job can provide scale inhibitor residual returns to protect against scale formation during flowback and early well life when conditions prevent continuous or batch application of product. Control of scale formation can also help alleviate other issues, such as erosion corrosion, potentially extending pump run times.
LONG-TERM SCALE CONTROL WITH SINGLE WELLHEAD APPLICATIONS.
SCAL10345A was tested with the operator’s HVFR, slickwater, and crosslink systems and found it caused no issues. SCAL10345A was applied at 150 ppm throughout the entire frac job with no issues. This treatment method has provided SCAL10345A residual for 200,000 to 300,000 BBL produced water. Residuals were monitored to track product effectiveness and ensure the well was protected during flowback and early well life.
Nalco Champion’s full lifecycle residual monitoring captures the full residual return, allowing for proactive treatment as frac residual reaches the MED threshold to avoid unnecessary well workovers due to scale.
The graph shows realized SCAL10345A residual returns after application of SCAL10345A in frac jobs. These long-term returns have protected Bakken wells from scale formation during early well life. Coupled with scale squeezes later in well life, SCAL10345A provides Bakken operators the ability to control carbonate scale formation through the life of a Bakken well.
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