Method for stimulating well production

Patent · Fri Dec 20 04:00:00 EST 1974

OSTI ID:7344262

Tate, J F; Maddox, J Jr; Shupe, R D

A method is claimed of increasing the production of fluids from a subterranean fluid-bearing formation having present therein acid-soluble components comprising injecting down the well bore penetrating said formation and injecting therefrom into said formation under a pressure greater than the formation pressure, an aqueous acidic solution containing from about 0.5 to 28 percent by weight of a mineral acid having a compound therein in an amount of from about 0.005 to about 2 percent by weight, said compound being a water soluble sulfonated, ethoxylated compound having the general formula R(OCH/sub 2/CH/sub 2/)/sub n/SO/sub 3//sup -/A/sup +/ wherein R is alkaryl, containing from about 6 to 18 carbon atoms in the alkyl portion thereof, n is a number from one to about 10, including fractions, and A/sup +/ is a monovalent cation selected from the group sodium, potassium, and ammonium, including mixtures, maintaining said solution in contact with the formation and production equipment for a time sufficient for the acid component to chemically react with the acid-soluble components of the formation to etch passageways therethrough thereby increasing substantially the flow capacity of the said subterranean formation and whereby said sulfonated, ethoxylated compound component is effective to prevent the formation of insoluble calcium compounds or the precipitation of calcium carbonate from the acid-spent solution.

• Assignee: Texaco Inc.
• Patent Number(s): US 3945438
• OSTI ID: 7344262
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ENHANCED RECOVERY
ESTERS
FLUID INJECTION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PETROLEUM SULFONATES
SULFONATES
SULFONIC ACID ESTERS
WATERFLOODING
WELL STIMULATION
WELLS