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US 10,208,561 B2Granted
Smart filter cake for strengthening formations
AssigneeM-I L.L.C.
InventorsGuido De Stefano, James Friedheim, Steven Young
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Abstract
A method of sealing a formation that includes drilling a wellbore through the formation while pumping a non-aqueous based wellbore fluid comprising an encapsulated first component into the wellbore, the non-aqueous based wellbore fluid forming a filter cake on the walls of the wellbore; and adding a second component to the wellbore fluid when fluid losses are registered during drilling, whereby the first and second components react to form a chemical sealing layer in the filter cake is disclosed.
Claims10
A method of sealing a formation, comprising:
- drilling a wellbore through the formation while pumping a non-aqueous based wellbore fluid comprising an encapsulated first component into the wellbore, the non-aqueous based wellbore fluid forming a filter cake in the wellbore;
- registering a fluid loss during the drilling and after at least some of the non-aqueous wellbore fluid has been pumped into the wellbore;
- and
- adding a second component to the wellbore fluid in response to the fluid loss registered during the drilling,
- wherein, at a point during the pumping of the non-aqueous based wellbore fluid, the first component is released from encapsulation, whereby the released first component and the second component chemically react with each other to form a chemical sealing layer in the filter cake.
2 more elements
Dependencies are inferred from the claim text.