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Search Petrowiki: Datum
...Glossary:Datum A relative comparison point, such as the Kelly bushing, sea level or mud line...
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...he effect of capillary pressure. Contents * 1 Applications of reservoir pressure data * 2 Depth datum of pressure * 3 Static pressure * 3.1 Static pressure from buildup tests * 3.2 Average reservoir...ervoir energy and fluid contacts with time * Input to numerical reservoir simulation models Depth datum of pressure Static pressures should be corrected to a fixed depth ...datum to eliminate the influence of the fluid pressure gradient for building isobaric maps, using bottomh...
Once you have acquired bottomhole pressure data, you need to understand how to interpret the data received. Because reservoir pressure data has numerous applications, interpreting it incorrectly could skew results elsewhere. Multilayer completions * 4 Pressure-depth plots * 4.1 Virgin reservoirs * 4.2 Developed reservoirs * 5 Pressure probes in duplex or triplex * 6 Effect of capillary pressure * 7 References * 8 Noteworthy papers in OnePetro * 9 External links * 10 See also Bottomhole pressure data are vital for understanding reservoir performance and predicting future behavior. Applications include: * Volumetric calculations (e.g., reserves) * Reservoir dynamic properties (e.g., permeability) * Drainage volumes (e.g., compartmentalization and flow barriers) * Fluid properties (e.g., density, phase behavior) * Well tubular and artificial lift design (e.g., size selection and lifting systems) * Evaluation of reservoir energy and fluid contacts with time * Input to numerical reservoir simulation models Static pressures should be corrected to a fixed depth datum to eliminate the influence of the fluid pressure gradient for building isobaric maps, using bottomhole pressure to calculateinflow performance relationship (IPR) diagrams for multilayer pressure data sets, or interpreting vertical permeability barriers from a pressure differential between two reservoir layers. The potentials (adjusted pressures) reflect the dynamics of fluid movement in the reservoir better than the raw pressure data can.
...ad, static lift, and submergence. Static head is the vertical distance between a liquid level and a datum line, when the supply is above the ...datum. Static lift is the vertical distance between a liquid level and a ...datum level, when the ...
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...ut to numerical reservoir simulation models. Static pressures should be corrected to a fixed depth datum to eliminate the influence of the fluid pressure gradient for building isobaric maps, using bottomh...rriers from a pressure differential between two reservoir layers. Pressures are adjusted to a fixed datum by calculating the hydrostatic potential (also called the ...datum-corrected pressure) as follows: ...(7.4) The potentials (adjusted pressures) refle...
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 โ 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.
...cquisition of Pressure and Temperature * 11 Specific Applications and Interpretation * 11.1 Depth Datum of Pressure * 11.2 Static Pressure * 11.3 Pressure-Depth Plots * 11.4 Pressure Probes in Duplex ...
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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...Kelly bushing on a rig with a rotary table. A depth datum...
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...Glossary:KB Kelly bushing on a rig with a rotary table. A depth datum...
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...In the context of datum, GL stands for ground level. In the context of lift, GL stands for gas lift...
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...The pressure at some datum (usually surface, FSP, or bottom hole, FBHP, measured while the well is flowing...
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