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- W2000321809 abstract "Abstract For several years, fracture designs for the deep Morrow in the Anadarko Basin were made using assumptions of the formation parameters: Permeability, bottom hole pressure, and fracture Permeability, bottom hole pressure, and fracture conductivity. Recent pressure transient analyses have shown that these assumptions in some cases were incorrect for permeability and bottom hole pressure. in addition, laboratory nesting with pressure. in addition, laboratory nesting with sintered bauxite proppants has produced a means of achieving sufficient fracture conductivity to sustain production increases obtained with successful fracture stimulation. Introduction The deeper trough portion of the Anadarko Basin lying in Beckham, Roger Mills, and Washita counties in Western Oklahoma provides the geographical setting for this study. This area had been subjected to some limited exploration efforts prior to 1969, but the successful completion of prior to 1969, but the successful completion of the first commercially productive Springer well provided the impetus for the accelerated activity provided the impetus for the accelerated activity which is still progressing. This well disproved the idea that the deeper formations were restricted to high pressure, low volume, reservoirs which were not economically attractive targets for exploratory drilling. Certainly the enhanced drilling technology made deeper zones more potentially profitable, but successful deep drilling in other inland areas had by that time dispelled the notion that deep lying sediments could not possess sufficient porosity for commercial production. Although wells have been completed in other horizons, most of the activity in the subject portion of the Anadarko Basin has been directed portion of the Anadarko Basin has been directed toward the Morrow and Springer formations, wick the emphasis on Morrow completion. The Morrow sands, of Pennsylvanian Age, are very heterogeneous in regard to lithologic characteristics, but may generally he described as fine to coarse grained, poorly sorted slightly conglomeritic or arkosic sandstone characterized by the presence of kaolinitic and illitic clays. Chert and feldspar pebbles are frequently present in the coarser sand, and iron chlorite and siderite are commonly found in association with the clay minerals, which frequently line the pore spaces. Through Scanning Electron Microscope (SEM) photography the clays have been shown to be photography the clays have been shown to be present in the pore spaces of the rock, as well as present in the pore spaces of the rock, as well as in the matrix material. The clays in the pores are subject to migration, which may be intensified by exposure to incompatible fluids, as well as production rates. production rates. The early fracturing treatments in the Morrow contained sand, glass beads, or a mixture of these two as propping agents. The material was subject to crushing when reservoir pressures were reduced, during production, to the point that formation closing exceeded the compressive strength of the proppant. proppant. Sintered bauxite as a fracture proppant was first utilized in the Morrow in early 1978. Because of ins superior compressive strength, its use has become a generally accepted practice in the deep Morrow zones which their inherent high closure stresses. The producing horizons of the deep Morrow in the area investigated by this paper range in depth from approximately 4270m (14,000 ft). to in excess of 4880m (16,000 ft). The original static bottom hole pressures range from approximately 62 MPa (9,000 psig) to 100 MPa (14,700 psig), and static bottom hole temperatures vary from 116 deg. C (240 deg. F) to 143 deg. C (290 deg. F). Although a great many wells had been successfully completed with only minimal stimulation, it was soon recognized that, in spite of abnormally high formation pressures, anomalous production characteristics indicated that damage may have occurred during the drilling or production of the well. P. 13" @default.
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- W2000321809 date "1980-09-21" @default.
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- W2000321809 title "The Use Of Bottom Hole Pressure Analysis In Optimizing Frac Design - Anadarko Basin Of Western Oklahoma" @default.
- W2000321809 doi "https://doi.org/10.2118/9262-ms" @default.
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