Results 1 - 10 of 481
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[en] In the first part, the various technological developments and advancements in prospecting, exploration and production are reviewed: development of off-shore technics, advances in thermal, injection and chemical process assisted hydrocarbon extraction, computer assisted oil localization and geophysical analysis, drilling technology, etc. In the second part, effects of these developments on oil production in near to long term are quantified
[en] Improved and enhanced oil recovery methods require sophisticated simulation tools to predict the injected flow pass together with the chemical reactions inside it. One approach is application of higher-order numerical schemes to avoid excessive numerical diffusion that is very typical for transport processes. In this work, we provide a first step towards higher-order schemes applicable on general polyhedral and corner-point grids typically used in reservoir simulation. We compare three possible approaches of linear reconstruction and slope limiting techniques on a variety of different meshes in two and three spatial dimensions and discuss advantages and disadvantages.
[en] The methodology used to determine the application of underbalanced drilling technology in the Elkton formation in Central Alberta was described. The Harmattan Elkton Pool has been in production since 1967 with a relatively constant production decline. In November 1996, the first effective underbalanced horizontal well in the Elkton was drilled by Apache Canada Ltd. Application of this technology has allowed more efficient exploitation of gas reservoirs without stimulation. Reservoirs which were originally developed with overbalanced vertical wells, and were redeveloped with overbalanced horizontal wells are now being reevaluated as candidates for horizontal underbalanced drilling. In the Elkton, production rates during underbalanced drilling reached 196 103m3/d while maintaining an underbalanced drawdown of 9000 kPa. This paper demonstrated that production can be significantly improved when using the technology of underbalanced horizontal wells compared to overbalanced vertical wells and overbalanced horizontal wells. 2 refs., 1 tab., 7 figs
[en] A practical method for statistically analyzing historic production data from horizontal wells was demonstrated. To date, more than 3,500 horizontal wells have been drilled in Western Canada with an estimated 900 more to be drilled in each of the next few years. The Statistical Technique to Analyze Production History (STAPH) is a new tool with which the petroleum industry can formulate strategy from a production or development engineering point of view. The technique was used to derive a set of production profiles with associated probabilities for producing horizontal wells grouped by lithology, or by lithology and geographic location. The production profile curves can be applied directly to production forecasting and budgeting for recently completed horizontal producers. 8 refs., 13 figs
[en] The present study aims to investigate effects of nanofluid flooding on EOR and also compares its performance with water flooding in field scale using the published experimental data provided from core-scale studies. The nanofluid is based on water including silica nanoparticles. The relative permeability curves of water, nanofluid and oil for a light crude oil core sample obtained in an experimental study are used in this numerical investigation. A 2D heterogeneous reservoir model is constructed using the permeability and porosity of the last layer of SPE-10 model. It has been shown that nanofluid flooding can substantially improve the oil recovery in comparison with the water flooding case. Afterward, the operational parameters of the 13 injection and production wells have been optimized in order to meet the maximum cumulative oil production. First, pattern search (PS) algorithm was implemented which has a good convergence speed, but with a high probability of trapping in local optimum points. Particle swarm optimization (PSO) approach has also been employed, which requires a large number of population (to approach the global optimum) with so many simulations. Accordingly, a hybrid PSO–PS algorithm with confined domain is proposed. The hybrid algorithm starts with PSO and depending on the distribution density of the values of each parameter, confines the searching domain and provides a proper initial guess to be used by PS. It is concluded that the hybrid PSO–PS method could obtain the optimal solution with a high convergence speed and reduced possibility of trapping in local optimums.
[en] This paper analyzes the reasons for the lack of wide acceptance of analytical cyclic-steam models for well stimulation. A reservoir-specific model is presented that provides excellent history-matching results for a California heavy-oil project. Finally, several parameter-optimization projections that were carried to economic limit on a present-worth basis are presented
[en] In this study, experimental conditions of the microbial enhanced oil recovery (MEOR) technique applied for Garzan oil (26o API; southeast Turkey) were utilized in a mathematical model that describes the transport of bacteria and its nutrients by convective and dispersive forces, including bacterial decay and growth. From the results of the variation of bacterial concentration with distance, it was observed that the bacterial concentration increased as the nutrients were consumed with time. Although some bacteria died during the experiments, this did not slow down the overall increase in bacterial population significantly at earlier times. However, in the later periods of the soaking process, severe bacterial decay occurred due to the lack of nutrients. The pressure behavior in the model during the shut-in period was also calculated and agreed well with the experimental results. (author)