US 12,281,258 B2
Removal of filter cake
Ayman Raja Al-Nakhli, Dammam (SA); Mohamed Mahmoud, Dhahran (SA); Zeeshan Tariq, Dhahran (SA); Alade Olalekan Saheed, Dhahran (SA); and Muhammad Shahzad Kamal, Dhahran (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA); and King Fahd University of Petroleum & Minerals, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA); and King Fahd University of Petroleum & Minerals, Dhahran (SA)
Filed on Apr. 4, 2022, as Appl. No. 17/657,901.
Prior Publication US 2023/0313023 A1, Oct. 5, 2023
Int. Cl. C09K 8/536 (2006.01); C09K 8/03 (2006.01); C09K 8/035 (2006.01); C09K 8/528 (2006.01); E21B 21/00 (2006.01); E21B 37/06 (2006.01)
CPC C09K 8/536 (2013.01) [C09K 8/032 (2013.01); C09K 8/035 (2013.01); C09K 8/528 (2013.01); E21B 21/00 (2013.01); E21B 37/06 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of treating a wellbore for filter cake removal, comprising:
providing a treatment fluid comprising
a first set of thermochemical reagents encapsulated in a first set of capsules,
a second set of thermochemical reagent encapsulated with a pH buffering acid in a second set of capsules,
an acid-generating material encapsulated in a third set of capsules, and
a retarding system comprising aluminum chloride (AlCl3), into a wellbore in a subterranean formation to attack filter cake in the wellbore, the filter cake comprising barite and quartz, or calcite and quartz; and
attacking the filter cake via the treatment fluid,
wherein the acid-generating material generates an in-situ generated acid in the wellbore to attack the filter cake, and
the retarding system retards a reaction of the in-situ generated acid with the quartz in the filter cake.