Case History: Water Shut-off Treatment in the Phosphoria Formation, Hot Springs County, Wyoming
- E.H. Olsen (Energy Endeavors Inc.)
- Document ID
- Society of Petroleum Engineers
- SPE Rocky Mountain Regional Meeting, 19-21 May, Billings, Montana
- Publication Date
- Document Type
- Conference Paper
- 1986. Society of Petroleum Engineers
- 3 Production and Well Operations, 2.2.2 Perforating, 5.2 Reservoir Fluid Dynamics, 4.6 Natural Gas, 5.1.2 Faults and Fracture Characterisation, 4.1.2 Separation and Treating
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Polymer water shut-off treatments have been successful in the past for the purpose of increasing oil production and decreasing water production in problem production and decreasing water production in problem wells. The results of applying a polymer water shut-off treatment to a well producing form the Phosphoria Formation in Hot Springs County, Wyoming, are presented in this paper. This water shut-off treatment presented in this paper. This water shut-off treatment represents an effective low-cost method for enhancing oil production in wells which have severe water production problems. The proper application of this production problems. The proper application of this technology can result in a significant amount of incremental oil production and a corresponding decrease in water production.
The specific well in this study was completed in the Phosphoria Formation with an initial producing rate of 216 barrels of oil per day. Within six months, the well was making 30 barrels of oil and 900 barrels of water daily. From this point, the oil production declined to 6 barrels per day after a period of two years and the water production remained nearly constant at 900 barrels per day.
A polymer water shut-off treatment was performed on the well; after which, the oil production performed on the well; after which, the oil production increased to 82 barrels per day and the water production decreased to 180 barrels per day. production decreased to 180 barrels per day. The expense of the treatment paid out in nearly two months, and after seven months the well was producing 13 barrels of oil and 200 barrels of water per day. The successful result of this treatment indicates the viability of polymer water shut-off treatments as low cost enhanced oil projects.
The recovery of additional economical oil reserves from reservoirs that have high water production rates has been a continuing challenge to production rates has been a continuing challenge to the oil industry. This is especially true for the past few years with a decreasing oil price and a decreasing supply of crude oil in this country. The proper application of the current polymer technologies to specific problem wells could result in increased oil reserves at relatively low cost and low risk.
The specific well which will be discussed in detail in this report is the Transcontinental Oil Corporation-Federal Fee ;# 6-7 located in Section 6-T44N-R98W of Hot Springs County, Wyoming, which is shown on the attached map (Fig. 1). The well is located in the Wagonhound Field and produces from the Phosphoria Formation. The Federal Fee # 6-7 was situated near the field's oil/water contact. As a result of this well placement, the well's production went from nearly water free to a very production went from nearly water free to a very high water cut in a short period of time. The history of the field indicated that there were sufficient reserves remaining to warrant a recompletion of the existing well. A polymer treatment was pumped into the well with excellent results.
The Phosphoria Formation is Permian in age as shown on the Stratigraphic correlation chart labeled Fig. 2. The Phosphoria interval is approximately 300 ft thick in the area of the Federal Fee # 6-7 well. The upper portion of the Phosphoria consists of a white to gray sucrosic Phosphoria consists of a white to gray sucrosic dolomite with good porosity and permeability.
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