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US 2026/0193523 A1Published application
Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking
OwnerRoy W. Martininventor
Life of this patent
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Abstract
Compositions and methods for inhibiting corrosion of metal in a wellbore during acidizing a wellbore in a subterranean formation. The composition comprising polycyclic diquaternary quinoxaline and their oxidative coupling products.
Claims26
An acid composition for acidizing a wellbore, the composition comprising:
- at least one acid, and an effective amount of polycyclic diquaternary quinoxaline;
- the polycyclic diquaternary quinoxaline having the general structure:
- wherein X− comprises a counter anion,
- R′ comprises an alkyl aryl group, and
- R1, R2, R3, R4 and R5 comprise hydrogen or a substitution group.
2 more elements
A method of forming a hydrocarbon-bearing formation for a stimulation operation, the method comprising the steps:
- assessing at least a first location and a second location for perforation of a casing in a wellbore;
- inserting a bottom hole assembly into the wellbore;
- the bottom hole assembly comprising a plug and a perforation tool and the bottom hole assembly being connected to a wireline;
- injecting an acidic composition into the wellbore;
- wherein the acidic composition is in direct contact with the perforation tool, the wireline and the casing;
- positioning and setting the plug in the wellbore at a position downhole but proximate to the first location;
- positioning the perforation tool at the first location;
- perforating the casing at the first location with the perforation tool thereby creating a first perforated area and a first cementitious debris;
- allowing the acidic composition to come into contact with the first perforated area and the first cementitious debris for a predetermined period of time to prepare the formation for the stimulation operation;
- moving the perforation tool up-hole to the second location;
- perforating the casing at the second location with the perforation tool thereby creating a second perforated area and a second cementitious debris;
- allowing the acidic composition to come into contact with the second perforated area and the second cementitious debris for a predetermined period of time to prepare the formation for the stimulation operation;
- removing the perforation tool from the wellbore:
- wherein the acid composition comprises an acid and a corrosion inhibitor composition, the corrosion inhibitor composition comprising:
- an effective amount of polycyclic diquaternary quinoxaline;
- the polycyclic diquaternary quinoxaline having the general structure:
- wherein X− comprises a counter anion,
- R′ comprises an alkyl aryl group, and
- R1, R2, R3, R4 and R5 comprise hydrogen or a substitution group.
16 more elements
Dependencies are inferred from the claim text.