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US 10,590,328 B2Granted
Removal of barite weighted mud
AssigneesSaudi Arabian Oil Company, Industrial and Mechanical Services Co. Ltd
InventorsMubarak Aoudah AlDhufairi, Saif Ahmed Al-Thabit
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Abstract
A composition for dissolving drilling mud including barite particles and a polymer includes an enzyme capable of reacting with the polymer; a chelating agent capable of dissolving the barite particles; and a catalyst capable of promoting a reaction between the chelating agent and the barite particles.
Claims12
A method comprising:
- introducing a mud removal fluid into a drilling well containing drilling mud, the drilling mud comprising barite particles and xanthan gum biopolymer, the mud removal fluid comprising:
- between 10% and 15% by weight of a carbohydrase enzyme capable of reacting with the xanthan gum biopolymer;
- between 5% and 25% by weight of an aminopolycarboxylic acid chelating agent capable of dissolving the barite particles;
- and
- between 5% and 20% by weight of a catalyst capable of promoting a reaction between the chelating agent and the barite particles, wherein the catalyst is selected from the group consisting of sodium hydroxide, potassium hydroxide, and iron chloride;
- soaking the mud removal fluid in the drilling well for an amount of time sufficient to dissolve at least some of the barite particles;
- and
- removing the mud removal fluid from the drilling well.
5 more elements
A method comprising:
- introducing a mud removal fluid into a drilling well containing drilling mud, the drilling mud comprising barite particles and xanthan gum biopolymer, the mud removal fluid comprising:
- between 10% and 15% by weight of a carbohydrase enzyme capable of reacting with the xanthan gum biopolymer;
- between 5% and 40% by weight of an aminopolycarboxylic acid chelating agent capable of dissolving the barite particles;
- and
- between 5% and 20% by weight of a catalyst capable of promoting a reaction between the aminopolycarboxylic acid chelating agent and the barite particles, wherein the catalyst comprises iron chloride;
- soaking the mud removal fluid in the drilling well for an amount of time sufficient to dissolve at least some of the barite particles;
- and
- removing the mud removal fluid from the drilling well.
5 more elements
Dependencies are inferred from the claim text.