	US 12,065,611 B1
	Sized bridging agents, low density pill and fluid compositions comprising said agents, and methods of controlling fluid loss and formation damage using said compositions
Hui Zhang, Sugar Land, TX (US); Changping Sui, The Woodlands, TX (US); and Zhipeng Wang, Houston, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Apr. 5, 2023, as Appl. No. 18/296,281.
Int. Cl. C09K 8/502 (2006.01); E21B 21/00 (2006.01); E21B 37/06 (2006.01)

CPC C09K 8/502 (2013.01) [E21B 21/003 (2013.01); E21B 37/06 (2013.01); C09K 2208/18 (2013.01)]

20 Claims

1. A wellbore fluid composition for forming a filter cake, the wellbore fluid composition comprising:

at least one of an aqueous-based carrier or a base oil;

at least one viscosifier additive, wherein the at least one viscosifier additive comprises a calcium based divalent brine system viscosifier; and

at least one bridging agent comprising at least one divalent organic salt in the form of sized-salt particles having particle sizes from about 2 microns to about 1000 microns,

wherein the wellbore fluid composition is a fluid loss control pill composition or a reservoir drill in fluid composition.