Estimation of original gas in place from short-term shut-in pressure data for commingled tight gas reservoirs with no crossflow /
72-hour shut-in pressure data. The backflow phenomenon is
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 72-hour shut-in pressure data. The backflow phenomenon is accuracy is improved if later times data is used, but then and two-point methods (secant and tangent methods) are easy, be near abandonment. The one-point method always gives but its major drawback is that it is not always feasible and can either over-estimate or under-estimate the OGIP. The cause the graph of p/z as a function of cumulative gas circumstances. This research studies different empirical conservative estimates of the OGIP, the two-point method is considered in this study, because it can use early time crossflow, from short-term (72-hour) shut-in pressure data; data is available. This is because p/z is not a linear during shut-in periods were considered in this work. The during shut-in periods. The crossflow , which is not subject fast, but inaccurate, especially at early times. Their fitting method can be more accurate whenever it is applicable fitting, and type curve methods. A two dimensional dry gas function of cumulative gas production (GP) under these it can have non-unique solutions. layer or commingled two-layer tight gas reservoirs without method, is not applicable for commingled fight gas methods to estimate the original gas in place (OGIP) for one- namely one-point (secant), two-point (tangent), curve non-darcy flow was found to have insignificant effect on the of this study, on the other hand, is the inter-layer flow in p/z72 data with relative reliability; its weakness is that production to be a curve instead of a straight line. The one reservoirs, especially when only short-term shut-in pressure simulator (GASSIM simulator) was used in this study. The The conventional material balance method (M.B.) , or p/z the flow of gas from one layer into another via the wellbore the OGIP estimates would be less useful since the field would the reservoir. The backflow, wellbore storage, short shut-in time, and low permeability are contributing factors that type curve method is relatively the better one among those usually more accurate than the one-point method. The curve wellbore storage, non-darcy flow, and backflow phenomenon |
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| Item Description: | "Major subject: Petroluem Engineering". Vita. |
| Physical Description: | xii, 89 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |