WELLBORE STORAGE EPUB DOWNLOAD

Wellbore storage is a function of the wellbore fluid and the completion size. The wellbore storage coefficient is defined as: C = Cf Vf with Cf the fluid compressibility and Vf the fluid volume. Abstract Extended wellbore storage can be mistakenly interpreted as a reservoir response in gas well testing with surface shut-in. This interpretation usually. Data affected by wellbore storage contains little or no information about the reservoir. Wellbore storage is typically controlled by the compressibility of the fluid in the wellbore. For a gas filled wellbore compressibility is high and wellbore storage effects will occur over a longer period of time.


WELLBORE STORAGE EPUB DOWNLOAD

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WELLBORE STORAGE EPUB DOWNLOAD


Data affected by wellbore storage storage contains little or no information about the reservoir. Wellbore storage is typically controlled by the compressibility of the fluid in the wellbore. For a gas filled wellbore compressibility is high and wellbore storage effects will occur wellbore storage a longer period of time.

Wellbore-storage effects - Schlumberger Oilfield Glossary

wellbore storage However, it has been found in practice that the models of Fair and Hegeman wellbore storage al. The following plots illustrate the effects of the three dimensionless storage parameters on the dimensionless typecurves.

A large value of dimensionless wellbore storage is associated with a large wellbore volume Vw. In practice, a range of values from to has been observed. Occasionally, a value much greater wellbore storage is observed when actual test data are matched against a typecurve.

WELLBORE STORAGE EPUB DOWNLOAD

In such cases, it is considered that some part of the formation high permeability or fracture is in communication with wellbore storage wellbore, and is acting as an extension to it. In such a case, the value for wellbore radius rw in the above equation is replaced by the effective wellbore half-length which makes the dimensionless wellbore storage constant a very small number.

Wellbore storage is normally assumed to be constant during a test and, in practice, this assumption is often reasonable. If the fluid compressibility is getting increased during the shut-in period gas accumulation, condensate wellbore storage re-vaporized, liquid re-injection in the reservoirthe derivative could have the following shape: Worse, it could create some derivative features that wellbore storage be misinterpreted as flow regimes.

Applications with multiple PBUs There are some cases when the pressure behaviour associated with wellbore storage may contain some useful information.

WELLBORE STORAGE EPUB DOWNLOAD

Comparing wellbore storage coefficients from several PBUs could help to detect some wellbore storage in fluid properties or connected volume.

For example, a gas condensate well may see a decrease in wellbore storage, as the condensate drops out in the reservoir and reduce the total compressibility. This is illustrated below with the PBU test in blue, showing a decrease wellbore storage storage.

Wellbore storage

Wellbore storage an oil well, an increase in wellbore storage may indicate an increase in compressibility due to a gas breakout. Fracture growth An increase in wellbore storage could indicate a connection to some larger fluid volume.

Wellbore storage a water injector, this could be created by a thermal fracture.

The fracture dimension could be approximately calculated from the storage coefficient wellbore storage fracture storage would be equal to the fluid volume inside the fracture, extracting a fracture length based on a wellbore storage width and height.

The wellbore storage coefficient could be tracked over time, via opportunistic PBUs, to monitor the fracture dimension and ensure no excessive frac growth fluid containment and cap rock integrity.



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