US 11,807,803 B1
Cement spacer fluid with polyethyleneimine hydrochloride salt as a shale inhibitor
Vikrant Wagle, Abqaiq (SA); Ali Mohammed Hussain Al Safran, Dhahran (SA); Abdullah Saleh Hussain Al-Yami, Dhahran (SA); Omprakash Pal, Dhahran (SA); and Sara Abdulaziz Alkhalaf, Al Khobar (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Aug. 2, 2022, as Appl. No. 17/816,865.
Int. Cl. C09K 8/40 (2006.01); E21B 33/16 (2006.01); C09K 8/46 (2006.01); C09K 8/42 (2006.01)
CPC C09K 8/40 (2013.01) [C09K 8/424 (2013.01); C09K 8/46 (2013.01); E21B 33/16 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for cementing in a wellbore, comprising:
making a cement spacer fluid by:
reacting a polyethyleneimine (PEI) with hydrochloric acid to form a polyethyleneimine hydrochloride (PEI HCl) salt;
dissolving the PEI HCl salt in water to form a PEI HCl salt solution; and
forming the cement spacer fluid from the PEI HCl salt solution;
making a cement slurry;
injecting the cement spacer fluid in a wellbore;
injecting the cement slurry in the wellbore; and
allowing the cement slurry to set.