US 12,168,749 B2
Cross-linked plugging agent stimulated by high density brine and preparing method thereof
Hu Jia, Sichuan (CN); and Shangkun Dai, Sichuan (CN)
Assigned to Southwest Petroleum University, Sichuan (CN)
Filed by Southwest Petroleum University, Sichuan (CN)
Filed on Oct. 20, 2021, as Appl. No. 17/505,659.
Application 17/505,659 is a continuation of application No. PCT/CN2020/076004, filed on Feb. 20, 2020.
Claims priority of application No. 202010094980.1 (CN), filed on Feb. 17, 2020.
Prior Publication US 2022/0041916 A1, Feb. 10, 2022
Int. Cl. C09K 8/42 (2006.01); C09K 8/512 (2006.01); C09K 8/516 (2006.01); E21B 33/13 (2006.01)
CPC C09K 8/426 (2013.01) [C09K 8/512 (2013.01); C09K 8/516 (2013.01); E21B 33/13 (2013.01)] 2 Claims
 
1. A cross-linked plugging agent, comprising:
a mixture of: 21 wt %-53 wt % of Potassium pyrophosphate (K4P2O7) as a main agent; 5 wt %-9 wt % of Xanthan gum as a gelling agent; and pure water, wherein the amounts are based on the total weight of the crosslinked plugging agent, and wherein the mixture forms a high density brine.