A Novel Analytical Pressure-Transient-Analysis Approach for Compositional Two-Phase Flow during Gas Injection and Falloff

2019 ◽  
Author(s):  
Cíntia G. Machado ◽  
Javad Rafiee ◽  
Albert C. Reynolds
Keyword(s):  
Transient Analysis ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Analysis Approach ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Transient Analysis ◽  
Pressure Transient

scholarly journals A Two-Phase Flow Model for Pressure Transient Analysis of Water Injection Well considering Water Imbibition in Natural Fractured Reservoirs

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Mengmeng Li ◽  
Qi Li ◽  
Gang Bi ◽  
Jiaen Lin
Keyword(s):  
Transient Analysis ◽  
Two Phase Flow ◽  
Fractured Reservoirs ◽  
Water Injection ◽  
Injection Well ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Water Imbibition

The pressure injection falloff test for water injection well has the advantages of briefness and convenience, with no effect on the oil production. It has been widely used in the oil field. Tremendous attention has been focused on oil-water two-phase flow model based on the Perrine-Martin theory. However, the saturation gradient is not considered in the Perrine-Martin method, which may result in errors in computation. Moreover, water imbibition is important for water flooding in natural fractured reservoirs, while the pressure transient analysis model has rarely considered water imbibition. In this paper, we proposed a semianalytical oil-water two-phase flow imbibition model for pressure transient analysis of a water injection well in natural fractured reservoirs. The parameters in this model, including total compressibility coefficient, interporosity flow coefficient, and total mobility, change with water saturation. The model was solved by Laplace transform finite-difference (LTFD) method coupled with the quasi-stationary method. Based on the solution, the model was verified by the analytical method and a field water injection test. The features of typical curves and the influences of the parameters on the typical curves were analyzed. Results show that the shape of pressure curves for single phase flow resembles two-phase flow, but the position of the two-phase flow curves is on the upper right of the single phase flow curves. The skin factor and wellbore storage coefficient mainly influence the peak value of the pressure derivatives and the straight line of the early period. The shape factor has a major effect on the position of the “dip” of pressure derivatives. The imbibition rate coefficient mainly influences the whole system radial flow period of the curves. This work provides valuable information in the design and evaluation of stimulation treatments in natural fractured reservoirs.

Pressure Transient Analysis of Two-Phase Flow Problems

1986 ◽  
Vol 1 (02) ◽  
pp. 151-164 ◽  
Author(s):  
Wei-Chun Chu ◽  
A.C. Reynolds ◽  
Rajagopal Raghavan
Keyword(s):  
Transient Analysis ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Transient Analysis ◽  
Pressure Transient ◽  
Flow Problems

GAS LIFT IN BASS STRAIT

1985 ◽  
Vol 25 (1) ◽  
pp. 107
Author(s):  
Kathryn J. Fagg
Keyword(s):  
Oil Recovery ◽  
Joint Venture ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Phase Flow ◽  
Gas Distribution ◽  
Two Phase ◽  
Future Developments ◽  
Artificial Lift ◽  
Gas Lift

Gas lift has proved a most effective artificial lift method for the fields operated by Esso Australia Ltd in Bass Strait for the Esso-BHP joint venture. Gas lift is now used to produce approximately 5 st ML/d of the total crude production from the Strait. It has enabled wells to be produced to water cuts higher than 90 per cent, increasing the oil recovery from the fields by up to 35 per cent.Gas lift work in Bass Strait to date has included the use of special packoff gas lift assemblies for wells with sliding sleeves, the development of a tool to assist the opening of the sleeves, improved operating techniques to limit slugging from gas-lifted wells, and the testing of gas lift performance. Gas lifting has been more successful than expected, and as a result, workovers initially planned to install full gas lift strings for older wells have not been necessary. The two phase flow correlations available have been improved to match the performance of the gas-lifted wells. The correlations are now used to design tubing strings with a number of gas lift mandrels prior to running the initial completions and to select the optimum gas injection depth.Future work in gas lift for Bass Strait will involve the optimisation and automation of lift gas distribution on the platforms. Gas lift will also be used for planned future developments, including mini-platforms and subsea completions.

Pressure Transient Analysis for Two-Phase (Water/Steam) Geothermal Reservoirs

1980 ◽  
Vol 20 (03) ◽  
pp. 206-214 ◽  
Author(s):  
S.K. Garg
Keyword(s):  
Transient Analysis ◽  
Phase System ◽  
Well Testing ◽  
Two Phase ◽  
Pressure Transient Analysis ◽  
Water Steam ◽  
Pressure Transient ◽  
Geothermal Reservoirs ◽  
Diffusivity Equation ◽  
Phase Water

Pressure Transient Analysis for Two-Phase Pressure Transient Analysis for Two-Phase (Water/Steam) Geothermal Reservoirs Abstract A new diffusivity equation for two-phase (water/steam) flow in geothermal reservoirs is derived. The geothermal reservoir may be initially two-phase or may evolve into a two-phase system during production. Solutions of the diffusivity equation for a continuous line source are presented; the solutions imply that the plot of bottomhole pressure vs. loglot (t=time) should be a straight pressure vs. loglot (t=time) should be a straight line. The slope of the straight line is inversely proportional to the total kinematic mobility. proportional to the total kinematic mobility. Comparison of the theory with a limited number of computer-simulated drawdown histories shows excellent agreement. Introduction In petroleum engineering and groundwater hydrology, well tests are conducted routinely to diagnose the well's condition and to estimate formation properties. Well test data may be analyzed to yield quantitative information regarding (1) formation permeability, storativity, and porosity, (2) the presence of barriers and leaky boundaries, (3) the condition of the well (i.e., damaged or stimulated), (4) the presence of major fractures close to the well, and (5) the mean formation pressure. Well testing procedures (and the quality of information obtained) procedures (and the quality of information obtained) depend on the age of the well. During temporary completion, testing involves producing the reservoir using a temporary plumbing system (e.g., drillstem testing), and the estimates obtained for the formation parameters are not very accurate. After completion, parameters are not very accurate. After completion, testing usually is performed in the hydraulic mode. In hydraulic testing, one or more wells are produced at controlled rates, and pressure changes within the producing well itself or nearby observation wells producing well itself or nearby observation wells (interference tests) are monitored.A major concern of well testing is the interpretation of pressure transient data. Much of the existing literature deals with isothermal single-phase (water/oil) and isothermal two-phase (oil with gas in solution, free gas) systems. In general, there is a lack of methodology for analyzing nonisothermal reservoir systems, either single- or two-phase (water/steam). Geothermal reservoirs commonly involve nonisothermal two-phase flow during well testing. This paper presents a theoretical framework for analyzing multiphase pressure transient data in geothermal systems. Two-Phase Flow in Geothermal Systems Consider a fully penetrating well located in an infinite reservoir of thickness h. We neglect any variations in either formation or fluid properties in the vertical direction. (This is a common assumption in pressure transient analysis.) The geothermal system may be two-phase before production or may evolve into a two-phase system as a result of fluid production. In the latter case, a boiling front will production. In the latter case, a boiling front will propagate outward from the wellbore. The boiling propagate outward from the wellbore. The boiling front may be treated as a constant-pressure boundary (p=saturation pressure corresponding to the local reservoir temperature).For the sake of simplicity, consider a reservoir that is initially two-phase everywhere. Furthermore, it is convenient to assume that the pressure (and, hence, temperature) is uniform throughout the system. In radial geometry, the pressure response is governed by the following diffusivity equation (see Appendix for a derivation of Eq. 1). (1) SPEJ P. 206

scholarly journals A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Mengmeng Li ◽  
Gang Bi ◽  
Jie Zhan ◽  
Liangbin Dou ◽  
Hailong Xu
Keyword(s):  
Single Phase ◽  
Two Phase Flow ◽  
Transient Behavior ◽  
Dual Porosity ◽  
Test Model ◽  
Phase Flow ◽  
Fracture System ◽  
Two Phase ◽  
Pressure Transient ◽  
Water Imbibition

The pressure transient behavior of water injection well has been extensively investigated under single-phase flow conditions. However, when water is injected into formation, there are saturation gradients within the water flooded area. Additionally, water imbibition is essentially important for oil displacement in dual-porosity and dual-permeability (DPDP) reservoirs. In this work, a novel semianalytical two-phase flow DPDP well test model considering both saturation gradient and water imbibition has been developed. The model was solved by the Laplace transform finite difference method. Type curves were generated, and flow regimes were identified by the model. The model features and effect of parameters were analyzed. Results show that water imbibition reduces the advancing speed of water drive front in the fracture system and slows down the water cut raising rate and the expansion speed of the two-phase zone in the fracture system. Therefore, the fluid exchange between the fracture and matrix systems becomes more sufficient and more oil will be recovered from the DPDP reservoir. The shape of pressure curves is similar for the single-phase and two-phase flow DPDP model, but the position of the proposed model is above the curves of the single-phase model. Shape factor mainly influences the interporosity period of the pressure derivatives. Water imbibition has a major effect on the whole system radial flow period of the curves. The findings of this study can help for better understanding of the oil/water two-phase flow pressure transient behavior in DPDP reservoirs considering saturation gradients and water imbibition.

Numerical Analysis of Two-Phase Flow in Gas-Stirred Reactors

1990 ◽  
Vol 204 (5) ◽  
pp. 311-319
Author(s):  
Y M Ferng ◽  
C C Chieng ◽  
C Pan
Keyword(s):  
Experimental Data ◽  
Liquid Metal ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Water Model ◽  
Phase Flow ◽  
Two Phase ◽  
Stirred Reactors

Using the multi-dimensional, turbulent, two-phase flow model, the fluid flow phenomena for gas injecting through a submerged lance in gas-stirred reactors are investigated numerically by a finite difference algorithm. The present numerical model is validated by comparison with the experimental data of the water model and extended to predict the flow fields and mixing phenomena inside the liquid metal model. This study indicates that the flow characteristics and mixing behaviour of the water model are similar to the metal model and the experimental data of the water model can be an important reference for the design of liquid metal reactors. The investigations consist of central (two-dimensional) and off-centred gas injection (three-dimensional) with full—and fractional—depth of lance submergence and with different gas injection rates.

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