Also the comparison of both methods at unsampled locations show better agreements for porosity than permeability. Geophysicists will find the description of fluid flow scaling problems faced by the reservoir engineer similar to their problems of scaling the transport of acoustic signals. This book describes the application of fractal mathematics to one engineering specialty? This paper develops methods and a theory that can be used to interpret water quality data obtained with membrane filters or cores and to predict well impairment caused by suspended solids. In fair condition, suitable as a study copy. Two solids, calcium and barium sulfate crystals, were injected into and generated within the sandpacks by chemical reaction. A field case involving early decline in well production caused by sulfur deposition was successfully history-matched with the simulation model developed in this study.
Many natural objects have been found to be fractal and fractal mathematics has been used to generate many beautiful? Two new concepts are introduced: the water quality ratio, which can be calculated from filtration data; and the injection well half-life, which is a measure of the rate of impairment and can be calculated from the water quality ratio. The observations are similar when the perpendicular fractures intersect with parallel fractures. This paper shows that the model can obtain realistic performance and half-life estimates for water injectors. Geophysicists will find the description of fluid flow scaling problems faced by the reservoir engineer similar to their problems of scaling the transport of acoustic signals. It describes the use of fractals in reservoir engineering.
Nonuniform deposition over the pay interval owing to reservoir layering or uneven stimulation was shown to accelerate the impact of sulfur deposition. The material balance method presented in the paper is of primary importance in the evaluation of geothermal reservoirs since both the areal extent and the vertical thickness can not be accurately determined, particularly in the initial development stages of the reservoirs. The experimental results affect waterflooding, design of drilling muds, and alkaline flooding. One of the most common production problems in geothermal fields is calcite calcium carbonate scale deposition. The potential user may be fascinated with the many published visual images but still uncertain how to extend these concepts to an application. A methodology for the use of conventional, black-oil reservoir simulators was subsequently developed to permit the investigation of sulfur-deposition processes for specific reservoir descriptions and well operations. Correction for ionic strength of the geothermal brine is also considered.
De Estados Unidos de America a España Descripción: World Scientific Pub Co Inc, 1994. Later, heterogeneous tube experiments are conducted with packing sand packs with different particles one after other. The key operational and reservoir parameters that influence the magnitude of impairment by sulfur deposition were identified through the derivation of an analytical expression for the rate of sulfur buildup assuming idealized flow conditions. If in the early stages of production the reservoir fluid is undersaturated with elemental sulfur, plugging will not be a problem. The results are analyzed with isoconversional method. Such processes can cause extensive formation damage in sandstones, thereby reducing oil production.
It is advised to inject inhibitors in fractures so that combustion front would only propagate in the matrix and driven oil would be produced through fractures. These results therefore provide new insight into the phenomenon of formation damage caused by water sensitivity or injection of incompatible brines. Bibliography Includes bibliographical references and index. Applications of the method to geothermal fields are discussed. A transition time from internal to external cake filtration is calculated using the trapping efficiency obtained from Stokesian Dynamics simulations. Moreover increasing pressure or flow rate do not help to propagate the front. Results reveal that the most important parameter for self-propagation of combustion is the aperture size of the fractures parallel to flow.
The reservoir engineer's job is to design and predict production from underground oil and gas reservoirs. Comparison of the experimental results with the results obtained from the analytical model proves the validity of the model. Register a Free 1 month Trial Account. Finally, by representing fractures with different particles combustion tube experiments are conducted and the results are evaluated. Physicists will be interested in the application of renormalization and percolation theory described in the book.
The linear core-flow experiments were conducted to study the flow impairment. In-situ release of naturally existing fines generally clays results form change sin colloidal conditions of the permeating fluid. It can be used as a textbook as well as a book for self-study. The bands vary in thickness between 1 to 30 mm, and many of the deformation bands exhibit normal offsets up to 40 cm. Scaling in the wells has been mechanically reamed periodically since 1984 to increases the production from the wells.
Fractal mathematics is used in image compression and for movies and is now becoming an engineering tool as well. However, once the reservoir is depleted below the saturation pressure, the sulfur buildup can become severe. Both internal and external cakes are considered in this method. Geologists will find surprisingly good numerical descriptions of subsurface rock distributions. In the model, formation damage is approached semiempirically; no assumptions were made with respect to the specific mechanism underlying impairment. Geologists will find surprisingly good numerical descriptions of subsurface rock distributions.
Equations are derived that allow us to combine the flow resistance in the external and internal filter cakes to obtain the overall decline in injectivity. Calcite scaling is experienced in almost all the geothermal fields around the world. In vertical experiments, it is observed that permeability increased at the beginning, and then decreased for later times. Fractal mathematics is used in image compression and for movies and is now becoming an engineering tool as well. Reducing the flow rate will generally increase the production time of a well before significant flow impairment by deposited calcite. Calcium carbonate precipitation occured in cores due to temperature difference between injected solution and core. Fractal mathematics is used in image compression and for movies and is now becoming an engineering tool as well.