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Abstract Formation damage results primarily through three types of mechanisms: particulate plugging, organic deposition and chemical plugging, organic deposition and chemical incompatibilities. Each of these damage mechanisms can be very detrimental to production performance. Complex damage production performance. Complex damage caused by a combination of formation lines migration, calcium carbonate scale and asphaltene precipitation can result in severe reduction in productivity. When this type of complex damage exists, a specialized stimulation treatment design is required to effectively remove the damage. The production history of an unconsolidated, asphaltic crude reservoir indicated that a damage mechanism existed and was responsible for abnormally low production rates. Quantitative and qualitative studies were performed in order to analyze this damage performed in order to analyze this damage and generate an operationally feasible and cost effective treatment. The conclusions generated from this investigation resulted in the design of a unique treatment and placement technique. This technique was placement technique. This technique was applied using a specialized solvent and acid system in a stimulation program that resulted in significant, stabilized improvement in well productivity. Treatment descriptions and production results are presented from the 18 wells that were included in this ongoing stimulation program. Candidate selection criteria and program. Candidate selection criteria and corresponding stimulation performance are also discussed. Introduction The Midway-Sunset Field is located in the southwestern area of the San Joaquin Basin, Kern County, California. The field extends from the town of McKittrick southeasterly along the Temblor Range foothills for 25 miles to the town of Maricopa. The average width of the field is 3 1/2 miles (Figure 1). Midway-Sunset spans more than 50,000 acres and contains over 9,200 wells producing in excess of 155,000 barrels of oil per day (BOPD). Anticipated ultimate recovery figures place this field as one of the largest oil fields in the continental United States. The topographic elevation ranges from 500' to 1800' with the oil zone occurring from just below the surface to several thousand feet in depth. Early development activity was concentrated in the Midway area northwest of the town of Taft and in the Sunset area near Maricopa. Following additional discoveries, the two areas merged. Field development increased in the 1960's as a result of the thermal enhanced oil recovery (TEOR) technology. These techniques coupled with a demand for low gravity crude have resulted in extensive field development to date. Currently the Midway-Sunset field is divided into three main areas: Northern, Central and Southern. P. 113 |
