No abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper presents the results of X-ray scans in vuggyfractured limestone core studies to determine porosity rock distribution and residual oil and water saturations for mexican core samples. Iodine as the injecting fluid provided a means for detecting water saturation and residual oil saturation. Xray Computerized Tomography (CT) was applied as an approach for oil and water saturation determination. The tracer (iodine) studies indicated that the water invasion increases with time until to get conduction porosity. CT scans measure the density distribution inside of vuggyfractured cores and block models samples during X-ray CT laboratory experiments. Firstly, an image processing method for determining, simultaneously, some of basic geometrical characteristics of homogeneous and vuggy-fractured porous media such as secondary porosity, specific surface, mean pore width, mean block thickness, mean fracture width, and absolute permeability is applied in order to characterize the core. Then, oil recovery mechanisms from vuggy-fractured reservoirs were studied because of the large reserves contained in such formations-The estimation of saturation of residual oil is fundamental to oil recovery from vuggy-fractured reservoirs under primary and enhanced recovery processes of practical interest. Saturation of residual oil depends of several petrophysical parameters such as conduction porosity, stagnation porosity, cementation exponent and fluid properties like viscosity of wetting and nonwetting phases. In this paper we present our recent work on imaging dynamic characterization in a vuggy-fractured core (calcareous) with X-ray tomographic techniques.We also perform forced displacement experiment to get two liquid phases inside the vuggy-fractured limestone core.

We present a method to obtain a 2D description of a reservoir in terms of transmissivity and diffusivity estimated from well testing. This technique is based on the averaging of the parameters in a proposed interference-test measurement area. This area depends on time, diffusivity, and pressure-gauge sensitivity. We discuss a field application in a heterogeneous, anisotropic reservoir, and we use a simulator that uses oiVwater production data from a pilot water-injection test to validate the application's results. 2132200 2130100 • 4 ( I J \ / I / • 12 r...--, / \ / / J J / / /

This paper wee prepemdfor pmaantationst the SPE InternetionelPetroIaumConference6 Exhibhionof Mexico held in VweorWz,Mexim, l~ls @f*r 1~. ThB peper wee selectedfor presentationby en SPE Prcgramcommittee followingreview of Informsfbnoonfainadin an abatrscfeubmmedby the @tOt'(e). COntenfS of the PaLwr, ee pmeenfed,have not been reviewedby the Sooiify of PetroleumEngineereend are eubjaotto wrracfbn by the author(s). The materiel,es presented,dose not neceeearilyraflaot any fmairionof the Stwiefyof PetroleumEngineere,its offii, or members.Paperap+eeented et SPE rrraalingeare eubjeofto pubiiiationreviewby EditorialCommiffaaaof the Society of PetroleumEngineers. ParmbeLon tooopyie raefrkfadtoan abafmcfofnotmorethan300 words.iliuafraficaa maymot be @ad. The abrracl shouldcontainoonapkuoua acknowledgment of where and by whomthe papar ie presented.Wrffe Ubrarian, SPE, P.O. Sox S33S3S,Rkhardacm,TX 750SMS3S, U.S.A. Telex 1S3245 SPEUT. ABSTRACT Thiapaper haadevdoped mimsgspmceashg melhocl for dmshing the dscotirsmm amd~a of oil pafanmters(formationtop, porosity,water -

This paper wee prepemdfor pmaantationst the SPE InternetionelPetroIaumConference6 Exhibhionof Mexico held in VweorWz,Mexim, l~ls @f*r 1~. ThB peper wee selectedfor presentationby en SPE Prcgramcommittee followingreview of Informsfbnoonfainadin an abatrscfeubmmedby the @tOt'(e). COntenfS of the PaLwr, ee pmeenfed,have not been reviewedby the Sooiify of PetroleumEngineereend are eubjaotto wrracfbn by the author(s). The materiel,es presented,dose not neceeearilyraflaot any fmairionof the Stwiefyof PetroleumEngineere,its offii, or members.Paperap+eeented et SPE rrraalingeare eubjeofto pubiiiationreviewby EditorialCommiffaaaof the Society of PetroleumEngineers. ParmbeLon tooopyie raefrkfadtoan abafmcfofnotmorethan300 words.iliuafraficaa maymot be @ad. The abrracl shouldcontainoonapkuoua acknowledgment of where and by whomthe papar ie presented.Wrffe Ubrarian, SPE, P.O. Sox S33S3S,Rkhardacm,TX 750SMS3S, U.S.A. Telex 1S3245 SPEUT. ABSTRACT Thiapaper haadevdoped mimsgspmceashg melhocl for dmshing the dscotirsmm amd~a of oil pafanmters(formationtop, porosity,water -