Analyzing pressure fall-off data of closing hydraulic fracture has been practiced for decades in the oil and gas industry. The diagnostic fracture injection test (DFIT, which is also referred to as fracture calibration test, mini-frac test, or injection fall-off test) is such an exercise where the pressure fall-off data is analyzed to provide information on closure pressure, fluid …
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The injectivity test and the fall-off tests are used to estimate the reservoir properties of injection wells in waterflood and tertiary recovery projects. ... Injection well transient testing and analysis are simple as long as the mobility ratio between the injected and in-situ fluids is about unity and the radius of investigation is not beyond ...
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A multi-functional test that can be used to determine fracturing pressure or if the well is fractured.
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Fall-off test is implemented after 6 months polymer injection. Fig. 14 presents the type curve of fall off test in three cases (shear thinning polymer injection, no rheology polymer injection and water injection) in synthetic model 2. Similar type curves can be observed in the original Petrocedeño simulation model and synthetic model 2.
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Log-Log Curve of Injection/Falling Off Well-test The welltest interpretation analysis result is: reservoir pressure P i =7.12MPa,effective permeability K=0.037mD. 2.3 Factors Sensitivity Analysis (a)Viscosity of injection fluid During the injection/falling off well test the injection fluid viscosity has great influences on well-test ...
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Injection/falloff testing (IFT) is an important method for obtaining coalbed methane (CBM) reservoir permeability. It is necessary to evaluate IFT interpretation reliability for more accurate …
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Injection/fall-off test is a viable alternative to the conventional production/build-up sequence since it eliminates surface emissions. However, the well test interpretation is complicated especially in oil reservoirs because of the presence of two mobile phases, the fluid originally in place (hydrocarbon) and the injected fluid (diesel, brine or nitrogen).
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9 Injection Fall-off issues Issues associated with Injection Fall-off testing vs. normal Well Tests First, the character of the system changes. Instead of single-phase flow, we are now faced with two-phase water/oil flow governed by relative permeability's Second, injection of cold water induces temperature changes in the formation This complicates the pressure behaviour …
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Injection Fall Off Testing_EPA_Guidance - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document provides guidelines for conducting pressure falloff tests of injection wells regulated under the EPA. It outlines the purpose and timing of falloff tests, requirements for test reports, and guidance for planning, conducting, and evaluating the tests.
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In conventional IFT, shut-in time is laser than injection time, but injection time should be shorter as possible to minimize testing costs (Seidle et al., 1991). The obtained pressure data from IFT can be interpreted by using analytical method, e.g., Horner plot (Horner, 1951) and MDH plot (Miller, 1950) and type curve or history matching ...
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See Free Details & Reputation Profile for John Seidle (69) in Port Deposit, MD. Includes free contact info & photos & court records.
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The injection/fall-off test is conducted with a single injection rate at the mass flow rate for 2 4 hours and the fall-off period lasting for. 96 hours.
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Guidance specific to the pressure fall-off test is provided in Attachment 1; Two Rate Test. The two rate test is a pressure fall-off test in which the injection rate is reduced but not brought to zero. It can be an alternative to the pressure fall-off test when wellbore storage makes a fall-off test useless.
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Injection fall-off (IFO) testing typically refers to testing done in either Water disposal wells or injector wells for pressure maintenance or secondary/tertiary recovery methods. They are most often employed when either a new wells is drilled and completed for this purpose or more commonly a pre-existing production well is converted into a ...
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Similarly, injection volumes that are too small may reduce the quality of test results and may not shorten the required fall-off time. Rates of 1.0 to 1.5 m3/min for 5 to 10 minutes are usually acceptable. Detailed recommendations may be found in Hawkes et al (2018). Pressure Fall-off Time Pressure fall-off time depends on test objectives.
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In a two-rate falloff test, the injection rate is changed from q 1 to q 2 while recording pressure. If the injected fluid is the same as the reservoir fluid, conventional production well multi-rate …
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Conventional coalbed methane (CBM) reservoir models for injection fall-off testing often disregard the quadratic pressure gradient's impact. This omission leads to discrepancies in simulating …
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water injection/fall-off test. One can see the flow sequences including four injection periods (inj#1, 2, 4, 5) and two sequences of pressure fall-off periods (fall-off #3, 6). Note that the later injections (inj#4, 5) occur during the two pressure fall-off periods (fall-off#3, 6). …
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Erich Seidel (1882-1948) was a German ophthalmologist who first described the Seidel test in 1921. Definition. The Seidel test is used to identify full-thickness defects in the cornea or sclera by revealing leakage of aqueous humor. Indications. To identify an …
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When the test type is Injection / Falloff, imported rates are converted to negative values, and the average reservoir pressure on the Properties tab defaults to the lowest measured pressure. Wells with injection and production, such as gas storage wells, can be analyzed using either Drawdown / Buildup or Injection / Falloff test types provided ...
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sufficient to conduct a valid observation of the pressure fall-off curve…". This guidance outlines procedures which will aid in performance of a valid pressure fall-off test. The purpose of the required injection well testing is three-fold: •Reservoir pressure increases associated with long-term fluid injection can be estimated.
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30+ years of industry experience primarily in unconventional reservoirs Reservoir engineering and economic studies for coalbed methane, shales, and tight oil
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A close examination of Figure 10 reveals that the modified CBM injection fall-off test model, which explicitly accounts for the dual-porosity nature of the reservoir, continues to exhibit the five distinct flow stage characteristic of conventional models: early wellbore storage effect, skin effect, cleat-to-fracture flow transition, pseudo ...
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Injection Fall-off Testing is an efficient way to derive in-situ information on most rock types. • A modest-size hydraulic fracture is created and pressure fall-off during shut in period is analyzed for fracture closure and after-closure radial flow period.
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On top of the above, injection pressure-drop well test method is adopted to evaluate fracturing effects. The result demonstrates that the reservoir porosity initially declines and...
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Abstract. Injection Fall-Off (IFO) testing is one of the most important methods to help monitor injector performance over time in waterfloods, water disposal operations, polymer floods, etc. IFO tests provide information about, amongst others, k*h, skin, reservoir transmissibility, and mobility contrasts. Analysis of the early-time period of such tests also can …
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This study examines the response of geothermal reservoirs that initially contains the free CO2 phase to injection/fall-off tests. Numerical modelling was carried out by using TOUGH2 simulator.
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plots necessary to analyze the test data should be available at the well site to help ensure valid test data is obtained and false test runs are quickly identified and aborted. Underground Injection Control (UIC) Class I Alternate Formation Pressure Fall-Off Test and Testing Plan Development Procedure #UICI-2b
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Seidle, J.P., and McAnear, J.F., "Pressure Falloff Testing of Enhanced Coalbed Methane Pilot Injection Wells", SPE 30731, presented at the SPE Annual Technical Conference and …
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In secondary- and tertiary-recovery projects three major fall-off situations may arise: liquid injection, gas injection, and alternate gas and liquid injection. The first two cases can be ...
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Figure 3 Simulated pressure fall-off test after 12 days of gas injection IOR 2015 – 18th European Symposium on Improved Oil Recovery Dresden, Germany, 14-16 April 2015 We compute type curves for the injection PFO test to study the impact of the following parameters in eqs. (3) and (4): 1) epdry, 2) fmdry, and 3) epcap. ...
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Simulated pressure fall-off test after 12 days of water injection into an oil-bearing formation. 863 Journal of Petroleum Science and Engineering 149 (2017) 860–872 N. Khoshnevis et al. Fig. 3. Simulated pressure fall-off test after 12 days of gas injection into an oil-bearing formation. Fig. 4. Effect of epdry in Eq.
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Injection-falloff test (IFT; Seidle et al., 1991, Zuber et al., 1990) is used to estimate in-situ reservoir permeability for object coal seams. This test is processed by firstly injecting a …
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Water injection is an important recovery method indeepwater reservoirs. A certain water injection volume isrequired to maintain target oil production. A shortinjection / fall-off test is therefore often conducted toevaluate well injectivity performance prior to oilproduction. Following that, permanent downhole gauges<br>are set to monitor full field development …
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Fall-Off Test: A Comprehensive Overview of Techniques. The Fall-Off Test is a powerful tool in the oil and gas industry, offering valuable insights into well performance and reservoir characteristics. This chapter delves into the various techniques employed in conducting a Fall-Off Test, highlighting their advantages and limitations. 1.1.
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Abstract. Water injection/fall off tests are normally associated with water flood project. Recently, interested in this type of well tests has developed in the area of reservoir appraisal. In the vast majority of situations associated with exploration activities, there is no infrastructure and equipment in place to collect and export the hydrocarbon produced during …
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Semantic Scholar extracted view of "Pressure Falloff Tests of New Coal Wells" by J. Seidle et al.
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An Injection Fall Off Test (IFO) program to acquire permeability data. We are a contractor will supply down hole equipment such as but not limited to, packers, gauges for IFO Test and IFO operations. Data acquisition and control equipment necessary to monitor, control and collect test results is required.
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