US 11,939,519 B2
Methods and systems to reduce scale formation
Qiwei Wang, Dhahran (SA); Mossaed A. Fahad, Dammam (SA); and Sultan H. Alsubaie, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Aug. 29, 2022, as Appl. No. 17/898,076.
Prior Publication US 2024/0067863 A1, Feb. 29, 2024
Int. Cl. C09K 8/528 (2006.01); E21B 37/06 (2006.01)
CPC C09K 8/528 (2013.01) [E21B 37/06 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method, comprising:
disposing a scale inhibitor and an alkaline chemical in a water stream,
wherein:
the water stream comprises sulfate ions and cations of a divalent earth metal;
the alkaline chemical comprises at least one member selected from the group consisting of an inorganic salt, an organic salt and a metal oxide,
the scale inhibitor is disposed in the water stream at a first location along the water stream;
the alkaline chemical is disposed in the water stream at a second location along the water stream;
the second location is downstream of the first location;
downstream of the second location, a concentration of the alkaline chemical in the water stream is from 5 milligrams per liter (mg/L) to 500 mg/L; and
downstream of the first location, a concentration of the scale inhibitor in the water stream is from 5 ppm to 50 ppm.