Reservoir geometry

Bruhn, C.H.L (1993) High-re..solution stratigraphy, reservoir geometry and facies characterization of Cretaceous and Tertiary turhidites from rift and passive margin Brazilian basins. PhD thesis, McMaster University, Hamilton. 

RESERVOIR GEOMETRY, TREATMENT SUCCESS AND PRODUCED WATER CHEMISTRY... 

Post-COj-treatment waters can provide information about the types of minerals present in the rock, and about reservoir geometry/heterogeneity, that can help explain treatment success or failure. 

The aim of this section is to achieve a better understanding of the controls on fluid mixing rates, in terms of volumes of material moved and the driving forces behind such movement. To do this, we take a simple reservoir geometry, and look at some simple end-member mixing... 

A single base reservoir geometry is used for aU of the subsequent calculations see Figure 1. The reservoir consists of two adjacent segments, separated by a notional barrier. Each reservoir segment is 1000 mx 1000 m areally, and 10 m thick. The key reservoir parameters and symbols are listed in Table 1. All equations use SI units but the table also lists some parameter values in field units, as these may be more familiar to some readers. 

Fig. 5. Simple reservoir geometry used for modelling fluid pressure equilibration. Note that this geometry can be unzipped along the centre of the shale and opened out to give a model that is topologically equivalent to a cross section through the base reservoir description shown in Figure 1. Symbols described in Table 1, apart from h (shale thickness) and / (shale gap length).

The second example is of another West African field, but in this case the oil is mainly in one reservoir only. The reservoir filling model, with no mixing, produces a strong and highly curved API depth trend that closely matches the observations (see Fig. 16). As discussed below, this curvature results from subtle interplay between the reservoir geometry and history and the kitchen geometry and history. 

We repeat our calculations with the same permeability, viscosity, m, grid parameters, and Pw and Pr values, but instead locate our well in Dallas. Figures 9-4a,b display the reservoir geometry and the computed mesh system. The volume flow rate increases to 448.8 cubic feet/hour. The corresponding pressure and streamfunction solutions are given in Figures 9-4c,d. 

As a result, the facies model has captured the complex geometry of the reservoir, including the sand injectites extruded from the main body at the top into the overburden. Being able to map these sand injections and translate them into the reservoir model is important because they affect the top reservoir geometry, and might change the connectivity and flow properties in a production scenario [18]. Similarly, the heterogeneous distribution of the... 

The geometry and reservoir quality have a very important influence on whether horizontal wells will realise a benefit compared to a vertical well, as demonstrated by the following example. 

When the fluid enters the die from a reservoir it will conform to a streamline shape such that the pressure drop is a minimum. This will tend to be of a coni-cylindrical geometry and the pressure drop, Pq, may be estimated by considering an inflnite number of very short frustrums of a cone. 

A model in which the geometry and physical properties of the reservoir and its production and pressure behaviour are simulated in order to make predictions of future behaviour. 

Yoshimura, A.S. Prud homme, R.K. "Viscosity Measurements in the Presence of Wall Slip in Capillary, Couette, and Parallel-Disk Geometries," SPE Reservoir Engineering, May 1988, 735-742. 

Lee, W.S. "Pressure Decline Analysis with the Christianovich and Zheltov and Penny Shaped Geometry Model of Fracturing," SPE/DOE paper 13872, 1985 SPE Low Permeability Gas Reservoirs, Denver, May 19 22. 

Figure 2. The geometry of the Lorentz gas channel model. The two heat reservoirs at temperatures Tl and Tr are indicated.

The above problem has been addressed in (Li et al, 2003), where we have considered a quasi-one dimensional billiard model which consists of two parallel lines and a series of triangular scatterers (see Fig.3). In this geometry, no particle can move between the two reservoirs without suffering elastic collisions with the triangles. Therefore this model is... 

There are a number of factors that determine the release rate and initial geometry of a hydrocarbon gas release. The most significant is whether the gas is under pressure or released at atmospheric conditions. Depending on the release source the escaping gas can last from several minutes or days, until the supply is isolated, depleted or fully depressured. Common long duration sources are underground reservoirs (e.g., blowouts), or long pipelines without intermediate isolation capabilities. 

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