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Search Petrowiki: Pressure transient testing
...Pressure transient testing The interpreted ...pressure transient test is a primary source of dynamic reservoir data. Tests on oil and gas wells are performed at var...letion, and production. The test objectives at any stage range from simple measurement of reservoir pressure to complex characterization of reservoir features. Most ...
The interpreted pressure transient test is a primary source of dynamic reservoir data. Tests on oil and gas wells are performed at various stages of drilling, completion, and production. Most pressure transient tests can be classified as either single-well productivity tests or descriptive reservoir tests. Productivity tests are conducted to: * Determine well deliverability * Characterize formation damage and other sources of skin effect * Identify produced fluids and determine their respective volume ratios * Measure reservoir pressure and temperature * Obtain representative fluid samples suitable for PVT analysis * Evaluate completion efficiency * Evaluate workover or stimulation treatments. Descriptive reservoir tests are conducted to: * Assess reservoir extent and geometry * Determine hydraulic communication between wells * Characterize reservoir heterogeneities * Evaluate reservoir parameters.
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...Category:5.6.3 Pressure transient testing . Pages in category "5.6.3 ...Pressure transient testing" This category contains only the following page. P * ...
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...Reservoir pressure and temperature The practice of using bottomhole ...pressure measurements to improve oil and gas production and solve problems of reservoir engineering began ar...ures were calculated using fluid levels; a later method was to inject gas into the tubing until the pressure became constant. The earliest bottomhole ...
The practice of using bottomhole pressure measurements to improve oil and gas production and solve problems of reservoir engineering began around 1930. Initially, pressures were calculated using fluid levels; a later method was to inject gas into the tubing until the pressure became constant. The earliest bottomhole pressure measurements were made with one-time-reading pressure bombs and maximum-indicating or maximum-recording pressure gauges that lacked the accuracy, reliability, or durability of present-day technology. The varied uses of bottomhole pressure and temperature measurements have increased in scope during the past two decades as instrumentation technologies have produced more reliable and accurate tools. These advances have made more applications possible, including multilayer reservoirs, horizontal wells, interference testing, and drawdown test interpretation.
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...PEH:Reservoir Pressure and Temperature Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor...Edward D. Holstein, Editor Copyright 2007, Society of Petroleum Engineers Chapter 7 – Reservoir Pressure and Temperature David Harrison, Schlumberger, and Yves Chauvel, Gamma Experts Pgs. 683-717 ISB...N 978-1-55563-120-8 Get permission for reuse The practice of using bottomhole pressure measurements to improve oil and gas production and solve problems of reservoir engineering began ar...
The practice of using bottomhole pressure measurements to improve oil and gas production and solve problems of reservoir engineering began around 1930. Initially, pressures were calculated using fluid levels; a later method was to inject gas into the tubing until the pressure became constant. The earliest bottomhole pressure measurements were made with one-time-reading pressure bombs and maximum-indicating or maximum-recording pressure gauges that lacked the accuracy, reliability, or durability of present-day technology. The varied uses of bottomhole pressure and temperature measurements have increased in scope during the past two decades as instrumentation technologies have produced more reliable and accurate tools. These advances have made more applications possible, including use in multilayer reservoirs, horizontal wells, interference testing, and drawdown test interpretation. This chapter is focused mainly on the types of measurements made and the tools available.
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...Estimating average reservoir pressure from diagnostic plots Diagnostic plots are a log-log plot of the ...pressure change and ...pressure derivative (vertical axis) from apressure ...
Diagnostic plots are a log-log plot of the pressure change and pressure derivative (vertical axis) from apressure transient test vs. elapsed time (horizontal axis). They are typically divided into three time regions: early, middle, and late. Two different method types, one using data from the middle-time region and the second using data from the late-time region (LTR), are commonly applied in estimating average reservoir pressure. The middle-time region methods are the Matthews-Brons-Hazebroek (MBH) method[1] and the Ramey-Cobb method. The MTR methods are based on extrapolation of the middle-time region and the correction of the extrapolated pressure.
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...Acquiring bottomhole pressure and temperature data The acquisition of bottomhole ...pressure and temperature data can be planned and executed in a cost-effective manner with a minimum disrupti...ng decisions about continuing the acquisition program. This article discusses options for obtaining pressure and temperature data. Contents * 1 Evaluating requirements * 2 Surface readout vs. downhole rec...
The acquisition of bottomhole pressure and temperature data can be planned and executed in a cost-effective manner with a minimum disruption to normal operating routines. In many cases, early on-site interpretation is useful in guiding decisions about continuing the acquisition program. Several questions should be answered at the design stage: * What are the objectives of measurement: static pressure, reservoir dynamics, fluid characterization, vertical pressure and temperature profile, well flow characterization, or other? Measurements can be transmitted to the surface, usually via an electric cable, or recorded in downhole memory powered by batteries. SRO has the obvious advantage of providing data in real time.
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... predicting the performance of producing natural-gas wells. Steady-state-, pseudosteady-state-, and transient-flow concepts are developed, resulting in a variety of specific techniques and empirical relationsh...ips for both testing wells and predicting their future performance under different operating conditions. Contents * 1...ontal liquid flow * 1.2 Steady-state radial horizontal gas flow * 2 Skin * 3 Non-darcy flow * 4 Transient flow * 4.1 Infinite-acting flow * 4.2 Pseudosteady state * 4.3 ...
Steady-state-, pseudosteady-state-, and transient-flow concepts are developed, resulting in a variety of specific techniques and empirical relationships for both testing wells and predicting their future performance under different operating conditions. The basis for all well-performance relationships is Darcy's law, which in its fundamental differential form applies to any fluid--gas or liquid. However, different forms of Darcy's law arise for different fluids when flow rates are measured at standard conditions. The different forms of the equations are based on appropriate equations of state (i.e., density as a function of pressure) for a particular fluid. In the resulting equations, presented next, flow rate is taken as being positive in the direction opposite to the pressure gradient, thus dropping the minus sign from Darcy's law. When multiple-line equations are presented, the first will be in fundamental units, the second in oilfield units, and the third in SI units.
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
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- Reservoir Description and Dynamics > Formation Evaluation & Management > Pressure transient analysis (1.00)
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...Testing the well into a chamber open at the bottom, but closed at the surface...
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... Edward D. Holstein, Editor Copyright 2007, Society of Petroleum Engineers Chapter 7 – Reservoir Pressure and Temperature David Harrison, Schlumberger, and Yves Chauvel, Gamma Experts ISBN 978-1-55563-12...0-8 Get permission for reuse The practice of using bottomhole pressure measurements to improve oil and gas production and solve problems of reservoir engineering began ar...ures were calculated using fluid levels; a later method was to inject gas into the tubing until the pressure became constant. The earliest bottomhole ...
The practice of using bottomhole pressure measurements to improve oil and gas production and solve problems of reservoir engineering began around 1930. Initially, pressures were calculated using fluid levels; a later method was to inject gas into the tubing until the pressure became constant. The earliest bottomhole pressure measurements were made with one-time-reading pressure bombs and maximum-indicating or maximum-recording pressure gauges that lacked the accuracy, reliability, or durability of present-day technology. The varied uses of bottomhole pressure and temperature measurements have increased in scope during the past two decades as instrumentation technologies have produced more reliable and accurate tools. These advances have made more applications possible, including use in multilayer reservoirs, horizontal wells, interference testing, and drawdown test interpretation. This chapter is focused mainly on the types of measurements made and the tools available. Some information is included on interpretation techniques to connect the data acquisition with its use in characterizing a reservoir and its contents. Detailed explanations of these interpretation techniques can be found in other chapters in this Handbook. Figure 1.1 – Pressure gradients in a well drilled in a virgin reservoir. In a developed reservoir, differential depletion of lithostatic layers with various permeabilities and the movement of fluid contacts can change the pressure profile. Monitoring the static pressures vs. time in developed reservoirs is a crucial tool for reservoir management. Pseudosteady-state flow behavior is observed when a well reaches stabilized production from a limited drainage volume. For constant-rate production under pseudosteady-state conditions, the difference between the flowing wellbore pressure and the average reservoir pressure in the drainage volume is constant, and the pressure drawdown is a linear function of time. The late-time buildup pressure will level off to the average reservoir pressure if the buildup duration is sufficiently long. Pressure depletion occurs with continued pseudosteady-state production. Transient flow is most often modeled with the radial diffusivity equation, which allows modeling pressure vs. time and pressure vs. distance from an observation point (typically, a well). At a sufficiently large time, the pressure disturbance anywhere in the reservoir is proportional to the logarithm of the inverse square of the radius away from the origin of the disturbance.
...PEH:Mathematics of Transient Analysis Publication Information Petroleum Engineering Handbook Larry W. Lake, Editor-in-Chi...ohn R. Fanchi, Editor Copyright 2007, Society of Petroleum Engineers Chapter 3 – Mathematics of Transient Analysis Erdal Ozkan, Colorado School of Mines Pgs. 77-172 ISBN 978-1-55563-108-6 Get permiss...can be translated into a mathematical statement and how mathematical analysis can be used to answer transient-flow problems. This broad area is common to many other disciplines, such as heat conduction in soli...
Most physical phenomena in the domain of transient fluid flow in porous media can be described generally by partial differential equations (PDEs). With appropriate boundary conditions and sometimes with simplifying assumptions, the PDE leads to an initial boundary value problem (IBVP) that is solved to find a mathematical statement of the resulting flow in the porous medium.
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