Compositions and method for controlling precipitation when acidizing sour wells

Patent · Tue Dec 19 04:00:00 EST 1989

OSTI ID:6916041

Dill, W R; Walker, M L

This patent describes an acidizing composition for treating a sour well. It comprises: a base acid solution having an initial ph below 1.9; an iron sequestering agent to combine with iron present in the solution 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 to combine with sulfides present in the solution comprising at least one member selected from the group consisting of an aldehyde, acetal, hemiacetal and any other compound capable of forming an aldehyde in solution, present in an amount of from about 1 to about 4 percent by weight of the acid solution, whereby precipitation of ferric hydroxide, ferrous sulfide and elemental sulfur is inhibited as acid spending occurs.

• Assignee: Halliburton Co., Duncan, OK
• Patent Number(s): A; US 4888121
• Application Number: PPN: US 7-177743A
• OSTI ID: 6916041
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACIDIZATION
ALCOHOLS
ALDEHYDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL COMPOSITION
DISPERSIONS
ELEMENTS
ENHANCED RECOVERY
GLYCOLS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INHIBITION
IRON COMPOUNDS
IRON HYDROXIDES
IRON SULFIDES
MIXTURES
NATURAL GAS WELLS
NONMETALS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYETHYLENE GLYCOLS
POLYMERS
PROCESS SOLUTIONS
RECOVERY
SOLUTIONS
STIMULATION
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WELL STIMULATION
WELLS