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• W4249810900 abstract "Abstract Early recognition of a fractured reservoir and an estimation of its rock characteristics, such as porosity and permeability, will influence the location and number of subsequent development wells and, therefore, is of major economic significance on the future development of the field. Underbalanced drilling provides an unprecedented opportunity to examine a reservoir as it is being drilled. With proper data acquisition and engineering interpretation, underbalanced drilling allows us to measure and calculate the Productivity Index while Drilling - PIWD. This data helps us locate and identify geologic anomalies such as fractures, tight zones, pinch outs, discontinuities, and water zones. A better understanding of the fracture networks and their impact on the production is critical to optimize infill drilling and produce the remaining reserves in any reservoir. Also, PIWD graph is a good indicator of reservoir productivity characterization. The real time data obtained using this graph can clearly show what kind of reservoir is being drilled and what kind of production can be expected. This paper reviews and analyzes oil production while Underbalanced Drilling of two wells in Hassi Messaoud field, Algeria. The interpretation of PIWD graphs demonstrates the existence of producing fractures. The results were confirmed during the Build-up test interpretation. Also, the image logs were correlated with production data to make sure they are in agreement. Every point on the image logs where signs of fractures were observed were studied and compared to the PIWD profile to establish a correlation type. This review is an attempt to examine the ability to predict the presence of fractures in future UBD wells in Hassi Messaoud field based on the production while drilling profile where image logs cannot be run. Introduction A naturally fractured reservoir contains fractures created by geological processes occurring naturally, without exogenous forces attributed to human activities or processes. From a geological and a reservoir-engineering point of view, naturally fractured reservoirs are only those where the fractures have an effect, either positive or negative, on fluid flow. Several investigators have attempted to evaluate naturally fractured reservoirs using various methods ranging from the macroscopic scale of core analysis through the mesoscopic scale of well logging up to megascopic scale of pressure transient analysis and 3-D seismic. Stearns and Friedman11, Aguilera1, and Nelson9 reviewed many of the approaches used to detect and analyze naturally fractured reservoirs. These methods include:A loss of circulating fluids and an increase in the rate of penetration of the bit during drilling are positive indications that a fractured, cavernous formation has been penetrated.Fractures and solution channels in cores provide direct information on the nature of the reservoir.Pressure buildup and flow tests are used to detect naturally fractured reservoirs. Aguilera1 assumed that the formation fluid flows from the matrix rock into the fractures under pseudosteady state and showed that semilog pressure buildup curves similar to the ones shown in figure 1. Engler and Tiab5 represent the pressure and pressure derivative response of horizontal well in naturally fractured reservoirs (figure 2).Well logging measurements based on sonic wave propagation, which are negligibly affected by the borehole conditions, are used as fracture indicators. Measurements by the caliper log, density-log, or resistivity log, under proper conditions, can be very effective in locating fractured zones." @default.
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• W4249810900 date "2009-03-15" @default.
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• W4249810900 title "Identification and Characterization of Producing Fractures in Naturally Fractured Reservoirs Using PIWD" @default.
• W4249810900 doi "https://doi.org/10.2118/120687-ms" @default.
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