Navegando por Autor "CARVALHO, Paulo Roberto de"

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Estudo da resposta de perfilagem de indução de camadas finas com diferentes arranjos de bobinas: modelamento analógico
(Universidade Federal do Pará, 1993-12-16) CARVALHO, Paulo Roberto de; VERMA, Om Prakash; http://lattes.cnpq.br/2723609019309173
Analog model studies were carried out comparing the eletromagnetic responses of various two-coil systems in a borehole, in order to improve the vertical resolution of the indution tools. For this purpose geoeletric models, simulating well-logging situations in the stratified beds of varying thicknesses, with or without fluid invasion, were constructed at a reduced scale of 20. The sensitivity of the system to measure relative fields (secondary/primary) is of the order of 0.01 %. Following conclusions were drawn after analysing the response profiles obtained for a coaxial and a coplanar coil systems: • In case of thin conducting beds placed in relatively resistive beds, such as shale beds in sandstones containing hydrocarbons, the coaxial system shows a better resolution than coplanar system both in determination and estimating the thickness of thin beds; • On the other hand, in the presence of thin resistive beds placed in relatively conductive zone, such as sandstone containing hydrocarbons lying in a shale, the coplanar coil system gives a better vertical resolution than the coaxial system; • "Shoulder effect" is much more pronounced in the coaxial system than the coplanar coils; • In case of thick beds, bed-boundaries are well defined in the coplanar coil system response. However, when the thickness is reduced the small oscillating signal indicating the interfaces disappears.
Acesso aberto (Open Access)
Respostas eletromagnéticas dos arranjos coplanar e coaxial em poço
(Universidade Federal do Pará, 2000-09-29) CARVALHO, Paulo Roberto de; VERMA, Om Prakash; http://lattes.cnpq.br/2723609019309173
None of the known resistivity borehole devices possesses azimuthal focusing properties whereas the unconventional coplanar coil array has, by design, a strong azimuthal focus. In order to understand in detail the influence of this property of the coplanar system, its electromagnetic responses in the varying boreholes conditons are obtained for a two coil array. Although simple, the solutions of a homogeneous conducting medium are exploited to understand the skin effects phenomena. The coplanar response of a nonhomogeneous medium, obtained through Sommerfeld boundary value problem, is then extended to the various borehole models, particularly (1) the invaded mud filtrate with gradational transition zones; (2) dipping multilayer sequences; (3) thinly laminated zones, and (4) gradational transition zone between two thick beds. Based on the comparative study between, the traditional coaxial and the unconventional coplanar coil responses we conclude that: 1. the skin effects are stronger in the coplanar responses than the coaxial but this disadvantage is partially compensated by applying the corrections for these effects; 2. the polarization "horns" are obtained in the coplanar profiles in front of bed boundaries, consequently, they are their high quality indicators; 3. the coplanar system is an important auxiliar tool to investigate the mud filtrate invasion and the presence of annulus zones which are direct indicators of movable hydrocarbons, and; 4. its azimuthal focussing properties can be explored in the borehole investigations of the axially assymetrical geological situations such as vugular or fracture zones and invasion zones in horizontal wells.