US 11,840,665 B2
Aqueous retarded acid treatment composition for well stimulation
Kern Larry Smith, Dhahran (SA); Abdullah Almoajil, Dhahran (SA); Mohammed H. Al-Khaldi, Dhahran (SA); and Ali Alsalem, Dammam (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Aug. 6, 2021, as Appl. No. 17/396,157.
Prior Publication US 2023/0043923 A1, Feb. 9, 2023
Int. Cl. E21B 43/27 (2006.01); C09K 8/74 (2006.01); C09K 8/60 (2006.01)
CPC C09K 8/74 (2013.01) [C09K 8/602 (2013.01); E21B 43/27 (2020.05); C09K 2208/12 (2013.01); C09K 2208/20 (2013.01); C09K 2208/28 (2013.01); C09K 2208/32 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An acid treatment composition, comprising:
a nonionic surfactant comprising nonyl phenol ethoxylate, wherein the nonyl phenol ethoxylate has a hydrophilic portion formed of O—(CH2CH2O)nH, where n has an average of 6;
a retarding agent comprising magnesium, wherein the retarding agent is present at a concentration of from about 20% to 30% by weight;
an acid; and
water;
wherein the nonionic surfactant and retarding agent are reactive with carbonate.