Revisiting the applications of drainage capillary pressure curves in water-wet hydrocarbon systems

Abstract

Abstract:The main focus of the paper is to introduce a new approach at studying and modelling the relationship of initial water saturation profile and capillarity in water-wet hydrocarbon reservoirs, and describe the available measurement methods and possible applications. As a side track it aims to highlight a set of derivable parameters of mercury capillary curves using the Thomeer-method. Since the widely used mercury capillary pressure curves themselves can lead to over-, or underestimations regarding in-place and technical volumes and misinterpreted reservoir behaviour, the need for a proper capillary curve is reasonable. Combining the results of mercury and centrifuge capillary curves could yield a capillary curve preserving the strengths of both methods, while overcoming their weaknesses. Mercury injection capillary curves were normalized by using the irreducible water saturations derived from centrifuge capillary pressure measurements of the same core plug, and this new, combined capillary curve was applied for engineering calculations in order to make comparisons with other approaches. The most significant benefit of this approach is, that all of the measured data needed for a valid drainage capillary pressure curve represents the very same sample piece.

Detecting breakpoints in artificially modified- and real-life time series using three state-of-the-art methods

“…Through the application of the three BP detection methods at hand (kink point, CE and CPM) on the 29 available MICP curves [64], it became possible to validate the expert's decision and, vice-versa, to evaluate the methods' e ciency. In the analysis, the values indicating the location of the BPs determined by the expert correspond to the last datum which was discarded.…”

A Special Issue: Geomathematics in practice: Case studies from earth- and environmental sciences – Proceedings of the Croatian-Hungarian Geomathematical Congress, Hungary 2015

“…The papers in this in this special issue of Open Geosciences were selected from within the framework of this conference with the hope of providing insights into-, and bridging the gap between mathematical and statistical practice among case studies from classical environmental applications of multivariate statistics [8,9] through the solution of reservoir geological problems [10][11][12][13][14], to the application of methods that are new to this field of science [15] along with many other aspects of geology and environmental sciences. The issue consists of two main parts, the first part deals with studies mainly concerning petrology, while the second is related to urban/classical environmental problems, handled using geostatistics.…”

“…He presents a study concerning the relationship of initial water saturation profiles and capillarity in water-wet hydrocarbon reservoirs. The most significant benefit of this approach is that it combines the advantages of two widely used drainage capillary curve measurement methods, while being able to overcome their disadvantages, yielding a normalized, more realistic curve (or Look-up function) applicable in reservoir geological and engineering calculations [12].…”

“…In their paper Topál et al [15] present a comparison of numerous state-of-the-art breakpoint detection methods and apply them, utilizing knowledge gained on a paleoclimatological time series and capillary pressure curves -such as those Nemes [12] deals with -framing the issue. Such a comparison has not been published before, therefore, this is indeed another novelty in this issue of Open Geosciences.…”

Pore Distribution Characteristics of the Igneous Reservoirs in the Eastern Sag of the Liaohe Depression

“…The study of pore structure is an important method for reservoir evaluation and prediction [28][29][30], yet few studies have been made regarding volcanic reservoirs' pore structures. The conventional methods for examining the pore structures of igneous rock include core observation, cast thin sectioning, scanning electron microscopy, conventional mercury injections, constant velocity mercury injections, and so on.…”