Method for stimulating the production of oil from a producing well

Claim 1

The method defined in claim 1 wherein the well is contacted with said soluble oil by placing a quantity of sOluble oil in the well and thereafter conducting a bailing or swabbing operation.

Claim 7

A method for stimulating the production of oil from a well completed in a permeable, oil-bearing formation comprising: contacting the well with a substantially anhydrous soluble oil comprising an admixture of a liquid hydrocarbon selected for its solubilizing effect upon sludge deposits in the well, a preferentially oil-soluble surface active alkyl aryl sulfonate, a preferentially water-soluble surface active alkyl aryl sulfonate, and an organic stabilizing agent, said soluble oil being injected under conditions such that the soluble oil does not enter the formation in any substantial amount; removing said previously placed soluble oil from the well; next injecting through the well and into the formation about 0.1 to 5 barrels of said soluble oil per vertical foot of formation treated; displacing said soluble into the formation by injecting about 1 to 5 volumes of oil per volume of soluble oil injected into the formation; and thereafter producing oil from the well.

Claim 12

A method for removing organic sludge from a well completed in a permeable, oil-bearing formation and from the formation immediately adjacent to the well, said method comprising the steps of: determining the chemical type of organic sludge deposited in the well and adjacent formation; preparing a substantially anhydrous soluble oil having a high solublizing capability for the sludge, said soluble oil comprising an admixture of about 52 to 90 volume percent liquid hydrocarbon, about 4 to 30 volume percent of a mixture of preferentially oil-soluble surface active alkyl aryl sulfonate and preferentially water-soluble surface active alkYl aryl sulfonate in the proportion of about 1 to 12 parts of said oil-soluble sulfonate per part of said water-soluble sulfonate, about 0.5 to 8 volume percent organic stabilizing agent, and less then about 10 volume percent water; circulating a first portion of said soluble oil through the well under conditions such that the soluble oil does not enter into the formation in any substantial amount; continuing the circulation of said soluble oil until the soluble oil is substantially free of dispersed organic and inorganic solid materials; next injecting a seCond portion of said soluble oil through the well and into the formation in the amount of about 0.1 to 5 barrels of said soluble oil per vertical foot of formation; displacing said soluble oil into the formation by injecting about 1 to 5 volumes of oil per volume of soluble oil injected into the formation; and thereafter producing oil from the well.