Decline Curve Analysis for Naturally Fractured Gas Reservoirs: A Study on the Applicability of "Pseudo-time" and "Material Balance Pseudo-time"

2007 ◽  
Author(s):  
Shahab Gerami ◽  
Mehran Pooladi-Darvish ◽  
Louis Mattar
Keyword(s):  
Material Balance ◽  
Curve Analysis ◽  
Gas Reservoirs ◽  
Decline Curve Analysis ◽  
Decline Curve ◽  
Naturally Fractured

Reserves Evaluation of Dry Gas Reservoirs through Flowing Pressure Material Balance Method

2014 ◽  
Author(s):  
J.D.. D. Guzman ◽  
J.A.. A. Arevalo ◽  
O.. Espinola
Keyword(s):  
Material Balance ◽  
Curve Analysis ◽  
Pressure Data ◽  
Gas Reservoirs ◽  
Standard Methods ◽  
Decline Curve Analysis ◽  
Decline Curve ◽  
Conventional Material ◽  
Material Balance Method ◽  
Gas Fields

Abstract This paper describes the practical applicacion of a method known as Flowing Gas Material Balance FGMB (L. Mattar and Mcneil, 1997) for reserve's estimation using bottomhole flowing pressure data in two dry gas fields in Mexico. The main purpose of this work is to apply the method in real cases having enough data and make a comparison with other standard methods of reserves estimation (J. Lee, 1996 and G.J. DeSorcy, 1994) such as Volumetric, Decline Curve Analysis, Conventional Material Balance and Numerical Simulation to see the results and validate the efficacy of its application. There are some premises should be considered before its application that will be explained, besides the advantages and results of this comparison which showed differences no greater than 10% with respect to the method more trustable to report reserves for these reservoirs.

Empirical methods of decline-curve analysis for shale gas reservoirs: Review, evaluation, and application

2020 ◽  
Vol 83 ◽  
pp. 103531
Author(s):  
Hong-Bin Liang ◽  
Lie-Hui Zhang ◽  
Yu-Long Zhao ◽  
Bo-Ning Zhang ◽  
Cheng Chang ◽  
...  
Keyword(s):  
Shale Gas ◽  
Curve Analysis ◽  
Empirical Methods ◽  
Gas Reservoirs ◽  
Decline Curve Analysis ◽  
Shale Gas Reservoirs ◽  
Decline Curve

Decline Curve Analysis Using Type Curves for Two-Porosity Systems

1981 ◽  
Vol 21 (03) ◽  
pp. 354-362 ◽  
Author(s):  
Giovanni Da Prat ◽  
Heber Cinco-Ley ◽  
Henry Ramey
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Skin Effect ◽  
Curve Analysis ◽  
Fractured Reservoir ◽  
Type Curve ◽  
Decline Curve Analysis ◽  
Decline Curve ◽  
Wellbore Storage ◽  
Naturally Fractured

Abstract Constant producing pressure solutions that define declining production rates with time for a naturally fractured reservoir are presented. The solutions for the dimensionless flow rate are based on a model presented by Warren and Root. The model was extended to include constant producing pressure in both infinite and finite systems. The results obtained for a finite no-flow outer boundary are new and surprising. It was found that the flow rate shows a rapid decline initially, becomes nearly constant for a period, and then a final decline in rat,- takes place.A striking result of the present study is that ignoring the presence of a constant flow rate period in a type-curve match can lead to erroneous estimates of the dimensionless outer radius of a reservoir. An example is presented to illustrate the method of type-curve matching for a naturally fractured system. Introduction Naturally fractured reservoirs consist of heterogeneous porous media where the openings (fissures and fractures) vary considerably in size. Fractures and openings of large size form vugs and interconnected channel, whereas the tine cracks form block systems which are the main body of the reservoir (Fig. 1). The porous blocks store most of the fluid in the reservoir and are often of low permeability, whereas the fractures have a low storage capacity and high permeability. Most of the fluid flow will occur through the fissures with the blocks acting as fluid sources. Even though the volumetric average permeability in a naturally fractured system is low, such systems often exhibit an effective permeability that is higher than the block matrix permeability, and behave differently from ordinary homogeneous media. These systems have been studied extensively in the petroleum literature. One of the first such studies was published by Pirson in 1953. In 1959, Pollard presented one of the first pressure transient models available for interpretation of well test data from two-porosity systems. The most complete analysis of transient flow in two-porosity systems was presented in 1960 by Barenblatt and Zheltov. The Warren and Root study in 1963 is considered the forerunner of modern interpretation of two-porosity systems. Their paper has been the subject of study by many authors. The behavior of fractured systems has long been a topic of controversy Many authors have indicated that the graphical technique proposed by Pollard in 1959 is susceptible to error caused by approximations in the mathematical model. Nevertheless, the Pollard method still is used. The most complete study of two-porosity systems appears to be the Mavor and Cinco-Ley study in 1979. This study considers wellbore storage and skin effect, and also considers production, both at constant rate and at constant pressure. However, little information is presented concerning the effect of the size of the system on pressure buildup behavior.Although decline curve analysis is widely used, methods specific to two-porosity fractured systems do not appear to be available. It is the objective of this paper to produce and study decline curve analysis for a naturally fractured reservoir. The Warren and Root model was chosen as the basis for this work. Partial Differential Equations The basic partial differential equations for fluid flow in a two-porosity system were presented by Warren and Root in 1963. The model was extended by Mavor and Cinco-Ley to include wellbore storage and skin effect. SPEJ P. 354^

scholarly journals Methods of Decline Curve Analysis for Shale Gas Reservoirs

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 552 ◽  
Author(s):  
Lei Tan ◽  
Lihua Zuo ◽  
Binbin Wang
Keyword(s):  
Shale Gas ◽  
Curve Analysis ◽  
Gas Reservoirs ◽  
Decline Curve Analysis ◽  
Shale Gas Reservoirs ◽  
Decline Curve

scholarly journals PENENTUAN ISI AWAL MINYAK DI TEMPAT DENGAN METODE VOLUMETRIK DAN MATERIAL BALANCE GARIS LURUS HAVLENA-ODEH DAN PERKIRAAN PRODUKSI ZONA ENH PADA LAPANGAN X

PETRO ◽  
2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Eoremila Ninetu Hartantyo ◽  
Lestari Said
Keyword(s):  
Material Balance ◽  
Curve Analysis ◽  
Volumetric Method ◽  
Balance Method ◽  
Production Performance ◽  
Decline Curve Analysis ◽  
Water Influx ◽  
Decline Curve ◽  
Original Oil In Place ◽  
Material Balance Method

<div class="WordSection1"><p><em>The purpose of this thesis is to calculate the original oil in place of ENH zone in X field. There are two methods to calculate the original oil in place of ENH zone, which is volumetric method and material balance method. From the calculation of original oil in place of ENH zone using volumetric method is 5.860.310 STB.</em></p><p><em>In Havlena - Odeh straight line material balance method needs the number of water influx. The water influx can be determine using Van-Everdingen Hurst method. The constant number of water influx of ENH zone is 311 BBL/psia. The original oil in place calculation of ENH zone using material balance method is 6.000.000 STB. Decline curve analysis is a method to determine the production performance and estimate ultimate recovery (EUR). By knowing the economic limit rate of ENH zone at 40 BOPD, it can be searched the oil rate and cumulative oil production of ENH zone. The economic limit rate of ENH is reached in March 2019 with recovery factor at 57,95%.</em></p><p><em>Keywords: original oil in place, volumetric, material balance, decline curve analysis</em></p></div>

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