Evaluation and Treatment of Organic and Inorganic Deposition in the Midway Sunset Field, Kern County, California

Abstract

ABSTRACT The Midway Sunset Field is the 2nd largest oil producing-field in the state of California. Current production is approximately 155,000 barrels of oil per day -from 9,200 wells. Due to variable productivity exhibited by wells in this field, an extensive study was conducted to determine potential production impairment mechanisms. This study was accomplished by analyzing cores, produced fluids and the organic deposition found in and around the slots of liners pulled from two wells. The reduced productivity exhibited by these wells was determined to be due primarily to the deposition of organic and inorganic components in the liner slots. This deposition can be associated with the asphaltic properties of the crude, the unconsolidated nature of the formations and the use of Thermal Enhanced Oil Recovery techniques. Quantitative and qualitative studies were performed to evaluate the damage and generate an operationally feasible and cost effective treatment. This investigation resulted in the design of a unique treatment and placement technique. Production response is presented from 35 wells included in this ongoing stimulation program. Candidate selection criteria and related stimulation performance are also discussed.