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SPE Members 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 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 Production response is presented from 35 wells included in this ongoing stimulation program. Candidate selection criteria and program. Candidate selection criteria and related stimulation performance are also discussed. Introduction An extensive stimulation program was implemented on two properties in the Midway-Sunset (MWSS) field. This program consisted of 37 stimulation treatments performed on 35 wells over a 2 year period. performed on 35 wells over a 2 year period. The development and implementation of the stimulation treatment utilized is described in detail in a previously published paper. This subsequent paper presents a summarized review of the ongoing stimulation program along with additional analyses quantifying the nature of the organic and inorganic fractions of the damaging deposits present in the wellbores. The first 18 wells of this program were Potter completions. Based on favorable production response from the initial 18 Potter well treatments, the program was expanded to Tulare Zone program was expanded to Tulare Zone completions. The production data from all 35 wells treated is presented along with critical properties of the Tulare and Potter formations. FIELD HISTORY The subject properties are located in the Midway-Sunset Field which lies in the southwestern portion of the San Joaquin Basin, Kern County, California. The field spans more than 50,000 acres and extends some 25 miles from the town of McKittrick southeasterly along the Temblor Range foothills to the town of Maricopa (Figure 1). Surface elevations range from 500 ft. to 1800 ft. above sea level with the productive interval occurring from just below the surface to depths below 2000 ft. P. 523 |
