Removal of filter cake
AssigneesSaudi Arabian Oil Company, King Fahd University of Petroleum and Minerals
InventorsAyman Raja Al-Nakhli, Mohamed Mahmoud, Zeeshan Tariq, Alade Olalekan Saheed, Muhammad Shahzad Kamal
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Abstract
A method, system, and drilling fluid for treating a wellbore for filter cake removal, including providing the drilling fluid having thermochemical reagents that are encapsulated and acid-generating material that is encapsulated into a wellbore in a subterranean formation to attack filter cake in the wellbore, and attacking the filter cake via the drilling fluid.
Claims16
A method of treating a wellbore for filter cake removal, comprising:
- providing a treatment fluid comprising
- a first set of thermochemical reagents encapsulated in a first set of capsules,
- a second set of thermochemical reagent encapsulated with a pH buffering acid in a second set of capsules,
- an acid-generating material encapsulated in a third set of capsules, and
- a retarding system comprising aluminum chloride (AlCl3), into a wellbore in a subterranean formation to attack filter cake in the wellbore, the filter cake comprising barite and quartz, or calcite and quartz;
- and
- attacking the filter cake via the treatment fluid,
- wherein the acid-generating material generates an in-situ generated acid in the wellbore to attack the filter cake, and
- the retarding system retards a reaction of the in-situ generated acid with the quartz in the filter cake.
A method of drilling a wellbore and treating filter cake, comprising:
- drilling the wellbore in a subterranean formation with a drilling fluid resulting in
- forming filter cake comprising barite and quartz along a wall of the wellbore from solids in the drilling fluid;
- during or after drilling the wellbore, adding additives for treating the filter cake to the drilling fluid, wherein the additives comprise a first set of thermochemical reagents encapsulated in a first set of capsules, a second set of thermochemical reagents encapsulated with a pH buffering acid in a second set of capsules, an acid-generating material encapsulated in a third set of capsules, and a retarding system comprising aluminum chloride (AlCl3), resulting in
- attacking the filter cake via the additives in the drilling fluid,
- wherein the acid-generating material generates an in-situ generated acid in the wellbore to attack the filter cake, and
- the retarding system retards a reaction of the in-situ generated acid with the quartz in the filter cake.
Dependencies are inferred from the claim text.