Compositions and method for controlling precipitation when acidizing sour wells

Patent · Tue Aug 21 04:00:00 EDT 1990

OSTI ID:6777454

Dill, W R; Walker, M L

This patent describes a method of treating a sour well penetrating a subterranean formation. It comprises: introducing into the well a treating fluid comprising an acid solution having a pH below 1.9, an iron sequestering agent comprising at least one compound selected from the group consisting of aminopolycarboxylic acids, hydroxycarboxylic acids, cyclic polyethers and derivatives of the acids and ethers, present in an amount of from about 0.25 to about 5 percent by weight of the acid solution, and a sulfide modifier comprising at least one compound selected from the group consisting of an aldehyde, acetal, hemiacetal and any other compound capable of forming aldehydes in the acid solution, present in an amount of from about 0.25 to about 5 percent of the acid solution; and treating the subterranean formation with the treating fluid.

• Assignee: Halliburton Co., Duncan, OK (USA)
• Patent Number(s): A; US 4949790
• Application Number: PPN: US s 7-320655
• OSTI ID: 6777454
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACIDIZATION
CHEMICAL COMPOSITION
DRILLING FLUIDS
ENHANCED RECOVERY
FLUIDS
NATURAL GAS WELLS
OIL WELLS
RECOVERY
WELLS