	US 11,697,755 B2
	Degradable tags for depth correlation mud logging
Chengzhe Gao, Blacksburg, VA (US); Shitong Sherry Zhu, Waban, MA (US); Marta Antoniv, Cambridge, MA (US); and Nouf AlJabri, Dhahran (SA)
Assigned to ARAMCO SERVICES COMPANY, Houston, TX (US); and SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Jul. 14, 2021, as Appl. No. 17/375,417.
Claims priority of provisional application 63/051,548, filed on Jul. 14, 2020.
Prior Publication US 2022/0017805 A1, Jan. 20, 2022
Int. Cl. C09K 8/08 (2006.01); E21B 49/00 (2006.01); G01N 33/28 (2006.01)

CPC C09K 8/08 (2013.01) [E21B 49/005 (2013.01); G01N 33/2882 (2013.01)]

12 Claims

1. An altered drilling mud, comprising:

a base fluid; and

a degradable polymeric additive comprises a tracer functional group that is bonded to a base polymeric component by a hydrolysable covalent bond, where the base polymeric component is a polysaccharide and where the tracer functional group is a combination of at least one halogen-containing functional group and a substituted heterocyclic aromatic group, wherein the at least one halogen-containing functional group is derived from a halogenated aromatic compound.