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• W1976094918 abstract "This paper was prepared for the Abnormal Subsurface Pressure Symposium of the Society of Petroleum Engineers of AIME, to be held in Baton Route, La., May 15–16, 1972. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon requested to the Editor PETROLEUM ENGINEERS JOURNAL is usually granted upon requested to the Editor of the appropriate journal, provided agreement to give proper credit is made. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers Office. Such discussions ma be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines. Abstract Although the petroleum industry has developed effective, and accurate techniques to analyze exposed formation pressure, drilling engineers continue to advance wells without knowing what pressures are ahead. A technique has been developed by the D.A.T.A. (Data Acquisition and Technical Analysis) engineers of the Oilfield Products Division, Dresser Industries, Inc., to approximate pressures ahead of the bit. This paper describes that technique. paper describes that technique. The basis for the procedure is the theory chat stratigraphic pressures are encapsulated in pressure seals and that these pressures can be approximated by measurement of the seal. Such measurements are the drillability and conductivity of the seal. Certain limitations presently exist in this technique, but field test results prove it to be an economical and effective tool for the drilling engineer to determine the course of a well. Introduction The petroleum industry has used numerous techniques to evaluate wireline logs and drilling equations for analyzing formation pressures. These techniques have been pressures. These techniques have been reasonably successful and have saved the industry time and money because of more efficient, economical drilling operations. TEXT The disadvantages of present formation analysis tests are that formation pressures below actual depth of the well (below the bit) cannot be estimated. Some good work is being done on interpretation of seismic data, however, for estimation of formation pressures before spudding a well. A technique has been proposed to estimate maximum pressures that could be encountered below a pressure seal immediately after a pressure seal has been penetrated and before any transition zone has been drilled. These seals have long been recognized and have been commented upon by numerous authors. In 1953, Dickerson said that high pressures must be effectively isolated by a pressures must be effectively isolated by a seal, otherwise pressures would be dissipated. Thomeer and Bottema in 1961, said that for safe drilling, the well must be drilled to safepoint in the caprock of the projected reservoir. In 1967, Boatman actually made shale density measurements of the seals in his investigations and thereby stated the fact. In 1970, Fertl and Timko recognized a sequence of such sealing barriers." @default.
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• W1976094918 title "Approximation of Pressures Ahead of the Bit by Analysis of the Exposed Pressure Seal" @default.
• W1976094918 doi "https://doi.org/10.2118/3896-ms" @default.
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