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lateral device
Abstract This paper covers the essentials of the tools, and practice of basic Russian well logs and Russian log analysis techniques. Emphasis is placed on those tools used in Russia which are significantly different than their counterparts in other major petroleum producing provinces. The BKZ Kapotax is five Russian lateral electrical resistivity logs run at different spacings depending on the reservoir thickness. It is used to calculate true formation resistivity. The technique corrects for mud and borehole effects using response curves modeled for a lateral log. This technique uses different tool spacings, borehole size, mud resistivities, diameter of invasion and the resistivities of the five laterals. This paper presents the BKZ method for predicting the true formation resistivity from this combination of lateral logs. Laterals were the primary resistivity log recorded by Russians before the early 1980's. Now the induction conductivity log is also being used, but not in the BKZ technique for determining Rt. Only lateral devices are used for this determination. By using the BKZ method, quantitative information may be extracted from historically recorded data and allows improved evaluation of reservoirs in previously drilled wells. Introduction Oil and gas wells drilled in Russia are classified as either research wells or production wells. Research wells are drilled by the local geologic institutes known as Geologia and include exploration and delineation wells. Production wells are drilled by local production institutes called Neft, for the purpose of developing and producing delineated fields. Most research wells are evaluated with open hole logs such as spontaneous potential (SP), a combination of lateral and normal resistivities, conductivity, microlog, caliper, gamma ray, gamma-neutron, density and acoustic logs along with cores and well tests. In contrast to the relatively complete data package gathered from research wells, production wells generally are evaluated with an SP in combination with a combination of lateral logs recorded at different electrode spacings. This paper describes the methodologies used for log interpretation using the BKZ method in actual Russian production wells. Software under development or available today will greatly assist the evaluation of these resistivity logs. P. 171^
- North America > United States > Texas (0.47)
- Europe > Russia (0.45)
- Asia > Russia (0.45)
Synopsis is given of the particular conlimestone fields as they affect A general outline ditions prevailing in electrical logging. The improvements introduced into the interpretation of the conventional logs during the last few years are briefly described. The principles underlying the new methods of logging-Limestone Sonde, Selective SP logging, MicroLogging, Induction Logging, Laterolog,-are indicated, and the contribution of these methods to a more accurate investigation of limestone formations is discussed. The paper is illustrated by field examples from various countries. Résumé Un aperçu général est donné des conditions particulières régnant dans les champs calcaires, du point de vue de leur effet sur le Carottage Electrique. Une rapide description est donnée des améliorations apportées à l'interprétation des diagrammes ordinaires pendant ces dernières années. Les principes qui servent de bases aux nouvelles méthodes de carottage electrique-Sonde à calcaires, P.S. sélective, MicroLogging, Carottage par Induction, Laterolog,- -sont indiqués, et l'on examine comment ces méthodes contribuent à une étude exacte des formations calcaires. Le papier est illustré par des exemples de terrain provenant de différents pays. Introduction Several new methods of electrical well logging have been recently introduced into field practice, some of which are still in the course of development. These * Director of Research, SchÍumberger Well Surveying Corporation, Ridgefield. Connecticut. ** Manager of Publication and Interpretation Department, Schlumberger Weil Surveying Corporation, Ridgefield, Connecticut. methods, although appropriate to the investigation of all kinds of formations, have been especially applied to the logging of limestone formations. Such particular attention drawn towards limestone fields is due to the fact that, in these formations, the conventional electrical logging procedures-which essentially consist in recording the SP (Spontaneous Potential) curve, plus regular "normal" and "lateral" resistivity curves-do not provide all the desired information, and are generally less efficient than in other types of strata such as sands and shales. The purpose of this paper is first to explain the particular conditions encountered by electrical logging in limestone fields. It will be shown that, in general, the conventional electrical logs provide values which are averages over large sections of formations and which sometimes lend themselves to reasonable determinations of the characteristics of these sections. Next, improvements developed for the interpretation of these logs during the last years will be explained. Finally, the new methods will be described briefly, and their respective merits for a more detailed and more accurate investigation of the limestone formations will be discussed. This review will include: the limes
- North America > Canada > Alberta > Clearwater County (0.82)
- North America > United States > Connecticut > Fairfield County > Ridgefield (0.54)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock > Limestone (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.71)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
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