| Author | Qureshi, Faheem Uddin |
| Call Number | AIT Thesis no.OTM-12-05 |
| Subject(s) | Gas condensate reservoirs
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering in Offshore Technology and Management, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. OTM-12-05 |
| Abstract | Perforating strategy has an important role in well production and reservoir depletion studies. Poor perforating strategy can reduce the well productivity and revenue by 10 to 50%, and the objective of perforating strategy is to maximize the well performance. This thesis focuses on the perforation strategy for multi - layered dry gas and gas - condensate reservoirs with and without aquifer support. A compositional reservoir simulation model with layers of gas, condensate and water aquifer was built in E CLIPSE E300. The model was si mulated for natural flow of gas - condensate reservoir and in - situ gas lift from dry gas reservoir with different perforation intervals and times to determine different values of recovery factors and abandonment time. The lower condensate zone is perforated first to allow the reservoir fluid flow naturally. The upper gas zone perforation is used for in-situ gas to lift the condensate and water from the lower zone. The commingled flow of a well is allowed when the perforation of t he upper gas reservoir is conducted. The flow rate and vertical flow performance is controlled by the segmented well keyword in the simulation software. The perforation intervals of lower condensate zone are fixed as full depth when there is no aquifer support below the reservoir. In case, when there is a water aquifer below the reservoir, the perforation intervals are fixed as upper half of the zone, due to early breakthrough of water coning. The removal of liquids from the well is done by in - situ gas of the upper zone. Liquid loading is observed when the model has high aquifer strength below the condensate reservoir and the gas production rate declines rapidly. The study investigates the effect of various perforation strategies on production decline rate. This technique is used for in - situ gas lift for multilayered gas - condensate well which is loaded up due to heavier molecules of condensate and aquifer water. The loaded liquid of lower reservoir and aquifer water in the wellbore is lifted by the gas of the upper zone based on different perforation intervals and timing of upper zone perforation. This technique of artificial lift is called in - situ gas lift. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-12-05 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Offshore Technology and Management (OTM) |
| Chairperson(s) | Chiu, Gregory L.F.;Suwat Athichanagorn |
| Examination Committee(s) | Thitisak Boonpramote;Jirawat Chewaroungroaj |
| Scholarship Donor(s) | ADB - Japan Scholarship Program (ADB - JSP) |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2012 |