The technique requires accurate estimates of fluid properties, production volumes, and reservoir pressure. Lsu ces past data oil and gas reservoir material balance programs. Material balance equation for a closed gas reservoir the material balance equation for a closed gas reservoir is very simple. Types of material balance problems first let us look at the types of material balance problems that arise in chemical engineering. Material balance equation for gas condensate reservoir. Numerous reservoir simulators have been developed, and are being employed in comprehensive reservoir production optimization studies. The material balance provides reservoir engineers a great deal of insight in knowing the initial hydrocarbon in place, how much hydrocarbon can be produced at different pressures, the primary mechanism for reservoir production and the potential usefulness. The conventional format of the gas material balance equation is the simple straight line plot of pz vs. The materialbalance equation is the simplest expression of the conservation of mass in a reservoir. Material balance calculations for gas reservoirs for a singlephase gas reservoir, the mb equation takes the form. The generality of the material balance approach is discussed, that is, the employment of a single material balance equation, but in certain prediction. Although it is a tank model equation, it can provide great insight for the practicing reservoir engineer.
The general material balance equation was first introduced by schilthuis 1936. The equation is derived as a volume balance which equates the cumulative observed production, expressed as an underground withdrawal to the expansion of the fluids in the reservoir resulting from a finite pressure drop5. Material balance has long been used in reservoir engineering practice as a simple yet powerful tool to determine the original gas in place g. The material balance approach vs reservoir simulation as an aid to understanding reservoir mechanics. General material balance for gas condensate reservoir and its. This material balance equation is still used widely for interpreting and prediction the performance of reservoirs. In order to consider production of an unconventional gas reservoir, a sufficient amount of gas in place within the reservoir is a concern. These calculations are also used as a first screening point to determine if sufficient oil remains after waterflooding for application of tertiary recovery. Pdf the effect of water influx on material balance analysis. They are routinely used co estimate oil and gas reserves and predict future reservoir performance.
Oil and gas reservoir material balance programs using the. In one scenario, a computer system divides a reservoir into multiple tank blocks, where at least two tank blocks are adjacent. Material balance applied petroleum reservoir engineering. In this context, capacitance resistance models crms comprise a family of material balance reservoir models that have been applied to primary, secondary and tertiary recovery processes in conventional.
The material balance approach to reservoir engineering is covered in detail and. Department of petroleum engineering and applied geophysics. Petroleum reservoir engineering, material balance equation calculations mbe by tom blasingame. Improvements to reservoir material balance methods onepetro. The material balance approach vs reservoir simulation as. Material balance calculations a general material balance equation that can be applied to all reservoir types was first developed by schilthuis in 1936. Assume a reservoir 8 f 6 compfessibility of 5x10 psi, a water compressibility of 3x10 psi. The method includes constructing a reservoir model of a reservoir system. Failure to account for a weak waterdrive can result in sig.
The reservoir model includes a reservoir and a plurality of wells. Methods and systems for modeling a reservoir system are described. E owf plot can be used to confirm the mechanism and estimate the ooip. The material balance equation is the simplest expression of the conservation of mass in a reservoir. Reservoir fluid properties are very important in petroleum engineering computations, such as material balance calculations, well test analysis, reserve estimates, inflow performance calculations and numerical reservoir simulations. Material balance treats a reservoir like a tank, with areal and depth pressure equilibrium. If the water influx history is known and the ooip unknown, the material balance methods in the previous sections are directly applicable. Material balance in waterdrive reservoirs petrowiki. Material balance has not been replaced by reservoir simulation, rather it is complementary to simulation and can provide valuable insights to reservoir performance that cannot be obtained by simulation. Enhancing the material balance equation for shale gas reservoirs. The adjacent tanks are connected at a tank block boundary so that materials are permitted to travel between. In comparison, the conventional material balance equation is shown to.
Statistical material balance analysis of water drive reservoirs adeloye olalekan michael available online at. They must account for the reservoir volumes of the produced fluids. Embodiments are directed to performing material balance analysis for tanks in a petroleum reservoir and to performing dual porosity material balance analysis. Material balance reservoir models derived from production data. The equation mathematically defines the different producing mechanisms and effectively relates the reservoir fluid and rock expansion to the subsequent fluid withdrawal. Material balance and decline curve analysis used as. Also, one or more material balance groups are constructed with each material balance group having a portion of at least one of the plurality of wells, a portion of the reservoir, and at least one well management algorithm to track material balance within the respective material. The material balance approach to reservoir engineering is covered in detail and is applied in turn to each of four types of reservoirs. Chapter eight the material balance equation mbe the material balance equation mbe has long been recognized as one of the basic tools of reservoir engineers for interpreting and predicting reservoir performance. For shale, this usually means it is a hydrocarbon source that generated large volumes of either thermal or biogenic gas.
Statistical material balance analysis of water drive. Pdf the effect of water influx on material balance. Pdf application of general material balance on gas condensate. Improvements to reservoir materialbalance methods j. The chapter on material balances presents a brief overview of reservoir engineering. The material balance equation is directly linked to original gas in place. Material balance analysis is an interpretation method used to determine original fluidsinplace ofip based on production and static pressure data. Calculate the various primary drive mechanism in any reservoir and rec. Material balance is maybe the most used tool by reservoir engineers during several decades. Even in simplified reservoir models, material balance is a necessary assumption because reservoirs are limited resources of petroleum. The general material balance equation relates the original oil, gas, and water in the reservoir to production volumes and current pressure conditions fluid properties.
This type of model excludes fluid flow inside the reservoir, and considers fluid and rock expansioncompression effects only, in addition, of course, to. The basic requirements for the application of material balance to a reservoir include. Received 3rd february abstract statistical approach of advancing material balance analysis of undersaturated reservoir under water drive mechanism was investigated in this research study. Summary experience with materialbalance data sets from the field and from simulation has revealed some procedures that can be used to improve analysis of both oil and gas reservoirs. Since then, thousands of papers have been published on. Initial adsorbed gas in place, ga initial free gas in place, gf create an equation that generates a linearline. With increased emphasis on total simulation employing mathematical models, one cannot help wondering whether the classical material balance methods are passe. Determine the pressure range where reservoir and water compressibilities should be included in a material balance analysis of a gas reservoir producing by v lumet ic depletion. Abstract bengal basin is one of the largest basin of the world in which most of the reservoir trap is structural especially anticlinal type and strong water drive mechanism are reported in some of the gas filed. Enhancing the material balance equation for shale gas. Conference paper pdf available november 2010 with 4,300 reads.
A new generalized material balance equation gmbe can be applied to the full range of reservoir fluids, including volatile oil and gas condensate. Material balance was one of the first and is the most widely used technique employed in estimating oil reserves and depletion. This type of model excludes fluid flow inside the reservoir, and considers fluid and rock expansioncompression effects only, in addition, of course, to fluid injection and. Material balance between reservoir tanks may be determined for multiple different reservoir tanks according to a multitank material balance model. Feb 26, 20 petroleum reservoir engineering, material balance equation calculations mbe by tom blasingame. In applied petroleum reservoir engineering, third edition, renowned expert ronald e. Its main applications lead to the estimation of hydrocarbon in place, water influx and gas cap size. Overall estimates of the amount of inplace and recoverable oil are based mainly on material balance. The material balance approach vs reservoir simulation as an. Application of general material balance on gas condensate reservoirs giip estimation. Assume a reservoir 8 f 6 compfessibility of 5x10 psi, a water compressibility of 3x10 psi and an initial water saturation of 30 per cent. The conventional gas material balance equation was developed for a volumetric gas reservoir. It is written from start of production to any time t as follows. Pdf a generalized approach to reservoir material balance.
It is based on the law of mass conservation applied to a reservoir at large by considering it as a large tank at a uniform pressure. Oil and gas reservoir material balance programs using the microsoft excel spreadsheet. The terms in a differential material balance are expressed as rates. Us20090306947a1 modeling and management of reservoir.
Reservoir engineering for geologists part 5b material balance for oil reservoirs by ray mireault p. A new generalized materialbalance equation gmbe can be applied to the full range of reservoir fluids, including volatile oil and gas condensate. The new, generalized material balance equation leads to an improved method of reservoir performance analysis. Differential balances are applied to continuous processes. The material balance method is a fundamental reservoir engineering tool for the evaluation of past and future global reservoir performance. A decline curve analysis is presented as an approach for predicting future performance and reserves.
These usually apply to batch processes the terms in a batch mater. Reservoir engineering techniques for forecast, reserves estimation and reservoir behaviour prediction analogues decline curves analysis material balance reservoir simulation reservoir simulation background model purposes model contents vs. Material balance calculations using the excel spreadsheet. Also, one or more material balance groups are constructed with each material balance group having a portion of at least one of the plurality of wells, a portion of the reservoir, and at. The multitank material balance model may be configured to perform a material balance analysis in a naturallyfractured reservoir or in other types of reservoirs. Material balance notes irven rinard department of chemical. Material balance calculations using the excel spreadsheet introduction material balance is a fundamental petroleum reservoir engineering tool that can be used to provide an understanding of a reservoir and the influence of any connecting aquifer. Applied petroleum reservoir engineering, third edition book.
Material balance petroleum reservoir materials free. The water influx model parameters can be determined. Material balance is a fundamental petroleum reservoir engineering tool that can be used to provide an understanding of a reservoir and the influence of any connecting aquifer. Advanced gas material balance in simplified format ihs markit. American institute of mining, metallurgical and petroleum engineers inc. The general material balance equation relates the original oil, gas, and water in the reservoir to production volumes and current pressure conditions. The key concepts are best learned by problem solving.
Be sure to read carefully through all the examples in this chapter. Reservoir material balance fundamentals problem 7 a volatile oil reservoir with initial pressure of 4,998 psia 34,460 kpa, estimated bubble point of 4,677 psia 32,247 kpa and average temperature of 246 f 118. The material balance for volumetric gas condensate reservoir initializes with the mass or mole balance principle, i. Material balance calculations for petroleum reservoirs in 1936, schilthuis developed a general material balance equation that can be applied to all reservoir types. A general material balance equation that can be applied to all reservoir types was first developed by schilthuis in 1936. Statistical material balance analysis of water drive reservoirs. For instance, if the reservoir is initially undersaturated, then an f w evs. Material balance is one of the fundamental tools of reservoir engineering. Pdf this work completes the search for a generalized material balance equation. This name has been chosen to contrast with the traditional material balance procedure, which relies on static reservoir pressure data. Material balance techniques are used to estimate hydrocarbons in place ooip and ogip from measurements of fluid production and the resultant change in reservoir pressure caused by that production. The application of material balance equation for gas condensate reservoirs is highlighted to calculate the initial reserves and gas inplaces that. Derive the general material balance equation for gas and oil reservoirs. Material balance equation an overview sciencedirect topics.
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