Well treatment fluid
AssigneeM-I L.L.C.
InventorsAndrew G. K. Jones, Raul Navarro-Mascarell, Mark Luyster
Life of this patent
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Abstract
Methods of drilling with a wellbore fluid may include pumping the wellbore fluid with an oxidative degradable polymer into a wellbore with and an inactivated oxidant; forming a filtercake in a downhole environment, allowing some of the fluid to filter into a subterranean rock formation to produce a filtercake containing the oxidative degradable polymer and inactivated oxidant; and removing the filtercake formed by the wellbore fluid from the wellbore walls by exposing the filtercake with a breaker fluid comprising an aqueous fluid, and at least one iminodiacetic acid or a salt thereof.
Claims19
A method of drilling with a wellbore fluid, wherein the wellbore fluid forms a filtercake on a wellbore wall, the method comprising:
- pumping the wellbore fluid with an oxidative degradable polymer and an inactivated oxidant encapsulated within an enteric polymer;
- forming a filtercake in a downhole environment by the pumping of the wellbore fluid into a well and allowing some of the fluid to filter into a subterranean rock formation to produce a filtercake comprising the oxidative degradable polymer and inactivated oxidant;
- and
- removing the filtercake formed by the wellbore fluid from the wellbore walls by contacting the filtercake with a breaker fluid, the breaker fluid comprising:
- an aqueous fluid;
- and
- at least one iminodiacetic acid or a salt thereof.
A method of degrading a wellbore filtercake, wherein the wellbore filtercake comprises an inactivated oxidant encapsulated in an enteric polymer and a degradable polymer, the method comprising:
- circulating a breaker fluid into the wellbore to activate the inactivated oxidant, the breaker fluid comprising:
- an aqueous fluid;
- and
- at least one iminodiacetic acid or a salt thereof;
- wherein the breaker fluid is selected so that after a predetermined period of time the filtercake substantially degrades.
A process comprising:
- pumping a first wellbore fluid comprising an oxidative degradable polymer into a wellbore through a subterranean formation;
- pumping a second wellbore fluid comprising an inactivated oxidant into the wellbore, wherein the inactivated oxidant is encapsulated within an enteric polymer;
- pumping a third wellbore fluid comprising a iminodiacetic acid into the wellbore;
- and
- allowing the iminodiacetic acid source to activate at least a portion of the inactivated oxidant by removing the encapsulating enteric polymer.
Dependencies are inferred from the claim text.