Simulation and analysis of fluid flow in gas condensate reservoirs /
Simulation and analysis of fluid flow in gas condensate reservoirs pose at least three challenges. First, we need to model fluid phase behavior at reservoir conditions since liquid dropout in the reservoir has a profound effect on vapor-phase PVT properties. Second, we need to address simulation of...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
2000.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=731990491&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Simulation and analysis of fluid flow in gas condensate reservoirs pose at least three challenges. First, we need to model fluid phase behavior at reservoir conditions since liquid dropout in the reservoir has a profound effect on vapor-phase PVT properties. Second, we need to address simulation of oil and gas two-phase flow in the reservoir as condensate oil is formed and its saturation increases above its critical value with decreasing reservoir pressure. Third, we need to derive an interpretation method for analyzing well pressure or rate data. In our research work, as the first step, we investigated the fluid phase behavior during gas condensate reservoir depletion. We verified the assumption that during gas condensate reservoir depletion the fluid PVT properties can be derived from lab constant composition expansion (CCE) by the flow simulation of three actual gas condensate samples. As the second step, we looked into the capabilities and limitations of transient pressure analysis using a single-phase analogy by which we modeled two-phase gas condensate flow as single-phase flow. We show that the pseudopressure response of vapor-phase after well shut-in can be classified into three types that we call Types I, II and III. In Type I, the pseudopressure response shows the characteristics of a two-zone, radically composite reservoir. In Types II and III, the pseudopressure response shows the characteristics of a three-zone radially composite reservoir. Three types of pressure data can be analyzed using a two-zone radially composite model. Next, we show that the oil saturation profile in the reservoir can be determined accurately by the analytical formula derived from the reservoir model, in that a reservoir is divided into three zones in terms of fluid saturation. Finally, to overcome the limitations of the single-phase analogy, we modeled oil and gas two-phase flow, and developed a pseudopressure formula. Thus, the traditional solution to flow equations for single-phase, slightly compressible liquid flow can be applied to model two-phase flow in gas condensate reservoirs, and transient pressure data from gas condensate reservoirs can be analyzed by the single-phase method. |
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| Item Description: | Vita. "Major Subject: Petroleum Engineering". |
| Physical Description: | xv, 154 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 101-104). |