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Analogously to well testing, two distinct stages are also observed at an injectivity test: injection and falloff. During the former, a fluid is injected into the reservoir and pressure rises. The latter is identified by a pressure drop, after the well is shut (Peres et
A total of 60 injection/falloff and insitu stress test data in 26 boreholes were conducted and collected successfully at depth ranging from 135.9 to 1243.6 m and the
3.1 Water Injection and Falloff Periods. A detailed study of the LTFD method for the water injection into an oil reservoir problem and dimensionless pressure
Summary. The challenges of reducing or eliminating emissions associated with welltesting operations during reservoir appraisal have revived interest in water
falloff test. 1. n. [Well Testing] The measurement and analysis of pressure data taken after an injection well is shut in. These data are often the easiest transient welltest data to
Summary. In this work, we present a new theoretical understanding of pressure data obtained at a water injection well. The theory provides new physical insight
This paper presents generalized procedures to interpret pressure injection and falloff data following coldwater injection into a hotoil reservoir. The relative permeability characteristics of
effects are present in pressure falloff and injection tests. This. early time line has a unit slope. This is also due to the fact that. pressure injection behaves like
Both slug tests and injection/falloff tests have been used by Taurus to determine the permeability of coal seams in the Black Warrior permeability of coal seams
A new technique for calculating hydraulic properties of unsaturated fractured formations is proposed as an alternative to the common approach involving steadystate analysis of
A total of 60 injection/falloff and insitu stress test data in 26 boreholes were conducted and collected successfully at depth ranging from 135.9 to 1243.6 m and the data is plotted in Table 1. The breakdown pressure (P b) and closure pressure (P s) are attained in the pressure cycles of insitu stress test record curves.
Summary. The challenges of reducing or eliminating emissions associated with welltesting operations during reservoir appraisal have revived interest in water injection/falloff tests. However, the twophase flow and injectioninduced temperature changes associated with injection/falloff tests complicate the problem of welltest
Buildup tests, injection/falloff tests, and slug tests each have been used successfully to determine critical reservoir and completion parameters in CBM reservoirs. In a buildup test, a well that is producing at a constant rate is shut in, and the downhole pressure is measured as it builds up. In an injection/falloff test, a well that is
DFIT The Unconventional Well Test course will review the theory of fractureinjection/falloff testing, the design of DFITs, and interpretation of DFIT data using both straightline and typecurve methods. Design and interpretation methods will be illustrated with North American field examples, including horizontal and vertical well DFITs in
1. n. [Well Testing] The testing of wells in which fluid is being injected into the reservoir.The most common type of test is a falloff test, in which injection is halted and the pressure decline is measured as a function of time. The most common situation is a waterflood.In many reservoirs, the formation pressure is high enough to maintain a full column of fluid
effects are present in pressure falloff and injection tests. This. early time line has a unit slope. This is also due to the fact that. pressure injection behaves like pressure drawdown and falloff.
G. Zimmermann. Harmonic Pulse Testing (HPT) has been developed as a type of well testing applicable during ongoing field operations because a pulsed signal is superimposed on background pressure
A new technique for calculating hydraulic properties of unsaturated fractured formations is proposed as an alternative to the common approach involving steadystate analysis of multirate gas injection tests. This method is based on graphical analysis of transient pressure data from an injectionfalloff test sequence. Flow in a fracture of limited lateral extent,
injection/falloff models are developed that account for fracture propagation, fracture closure, and after fracture closure diffusion. A fractureinjection/falloff differs from a conventional injection/falloff sequence in that pressure during the injection is sufficient to initiate and propagate a hydraulic fracture. By
1.7.1 Injectivity test analysis. In an injectivity test, the well is shut in until the pressure is stabilized at initial reservoir pressure p i.At this time, the injection begins at a constant rate q inj, as schematically
Analogously to well testing, two distinct stages are also observed at an injectivity test: injection and falloff. During the former, a fluid is injected into the reservoir and pressure rises. The latter is identified by a pressure drop, after the well is shut (Peres et al., 2006; Bela et al., ).
The corresponding temperature profiles versus the depth during water injection and during pressure falloff after injection are given in Fig. 6. Sudden pressure drop in well MOLGT03 during injection test indicates fracture reopening/widening. The fluid flow is changing from radial flow into more fracture type flow with dimension parameter
model (LTFD) and Eclipse 100 for two (2) WAG cycles with test schedule presented in Table 1 [5]. As is shown in the figure, the two graphs match well. In this report, the pressuretransient behavior of water injection/falloff periods and gas injection/falloff periods following water in the presence of skin and
An insitu stress test can be either an injectionfalloff test or an injectionflowback test. The insitu stress test is conducted with small volumes of fluid (a few barrels) and injected at a low injection rate (tens of gal/min), normally with straddle packers to minimize wellbore storage effects, into a small number of perforations (1 to 2 ft).
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 oilwater twophase flow model based on the PerrineMartin theory. However, the saturation gradient is not considered in the Perrine
DFIT The Unconventional Well Test course will review the theory of fractureinjection/falloff testing, the design of DFITs, and interpretation of DFIT data using both straightline and typecurve methods. Design and interpretation methods will be illustrated with North American field examples, including horizontal and vertical well DFITs in
Abstract In this work we present a new theoretical understanding of pressure data obtained at a water injection well. The theory provides new physical insight on how permeability
Pressure transient data obtained from an injection/falloff test are analyzed using pressure transient analysis (PTA) to derive reservoir permeability (k) and skin factor (S). Geothermal pressure transients are commonly interpreted using analytical models which assumes that the fluid flow in the reservoir is isothermal. However, for geothermal reservoirs analysis
A pressure falloff test followed 24 hours injection. 3500,I I I I I,40 0 5 10 15 20 25 30 35 Time (hours) Fig. 3 Massive hydraulic fracturing and falloff test (4) Two postfrac injectionfalloff tests conducted on November 27 and 29, 1992, respectively; Fresh water was injected at a rate of 9.44 BPM for
DOI: 10.2118/174906MS Corpus ID: 61600291; Comprehensive Global Model for BeforeClosure Analysis of an Injection Falloff Fracture Calibration Test @inproceedings{LiuComprehensiveGM, title={Comprehensive Global Model for BeforeClosure Analysis of an Injection Falloff Fracture Calibration Test}, author={Guoqing Liu
