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• W2037536105 abstract "Abstract Drilling and cementing in the Madden Deep Unit of west central Wyoming is characterized by formation pressure variances, gas influx and lost circulation problems. These problems must be considered when designing cement slurries for each casing and liner job. Consideration must also be given to the fact that large volumes of cement are required for these jobs. To maximize the success of each cement job, extensive laboratory pre-testing and field blend testing are conducted prior to moving cement to location. This procedure consists of designing and testing a cement slurry to meet such parameters as thickening time, fluid loss control, compressive strength development and hydrostatic pressures. This pre-testing is followed by testing each load of field cement blend to detect any deviations from the pilot cement. This paper will discuss such aspects of the field blend testing as bulk plant sampling, acceptable thickening time windows, test repeatability, and the use of dry additive identification. A major point will show how the use of dry additive identification is a very valuable and time saving tool in the testing of field blends. Introduction The cementing jobs in this case study were performed on a deep well drilled in the Wind River Basin of Wyoming. Figure 1 shows this area outlined on a map of the state. The discovery well on the Madden Anticline in this unit was drilled in 1968, and completed with significant gas production in the Ft. Union, Mesaverde and Cody Shale formations. It was not until the drilling of No. 1-5 Bighorn, spudded in October, 1983, that an attempt was made to drill deeper into Precambrian rock. This well was drilled to a total depth of 24,877 ft and completed with gas production in the Madison and Bighorn Dolomite formations at 23,758 - 23,902 ft. The well under consideration in this discussion was also drilled into Precambrian formations. Figure 2 is a simplified schematic of the strings of pipe set from the surface to 17,000 ft. Due to the length of the strings and the drilled hole size, testing for the 20 inch casing job to 7,000 ft and the 16 inch casing job to 14,000 ft will be discussed here. SLURRY DESIGN The overall objective of basic slurry design is to provide the additives that are necessary to help ensure successful placement of the cement. The main parameters of concern are temperature (for proper retarder selection), formation pressures (for selection of slurry density, fluid loss additives, and gas-entry control additives), and the flow behavior of the slurry. Experience in the Madden Deep Unit has shown that gas influx from overpressured formations is a major concern in these slurry designs. Relative to this is the need for a reduction of overall hydrostatic pressures in long casing strings to inhibit loss of circulation into normal or underpressured zones. Tables 1 and 3 list the cements for the two jobs under consideration in this study, and Tables 2 and 4 give the conditions under which they were tested. Cements and additives used were those which gave slurry properties to best handle the existing well conditions. Of primary concern in the first job was gas entry into the wellbore. To help reduce damage to the cement from gas channeling, a gas migration control additive was used. P. 347^" @default.
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• W2037536105 date "1988-05-11" @default.
• W2037536105 modified "2023-09-27" @default.
• W2037536105 title "Field Cement Sampling and Testing: A Case Study in the Madden Deep Unit, Wyoming" @default.
• W2037536105 doi "https://doi.org/10.2118/17513-ms" @default.
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