| Author | Surapong Tanwattana |
| Call Number | AIT Thesis no.OTM-11-03 |
| Subject(s) | Gas reservoirs
|
| Note | A thesis submitted in partial fulfillment 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-11-03 |
| Abstract | Water coning in gas wells is widely accepted as a general phenomenon in the gas production. It can cease production of wells and leave a high volume of gas trapped at high reservoir pressure. Water coning causes reduction in gas productivity and production life owing to early water breakthrough and increase of water influx. Water coning is consistent with the balance of pressure drawdown and gravity forces of gas itself. Then not only the production technique but also the reservoir characteristics have influence on behavior of water coning. This study uses various numerical models of variation in reservoir parameters and production technique both in vertical and horizontal wells to determine optimal strategy to produce gas in a water driver reservoir. Gas recovery is compared different water gas ratios (WGR) in order to observe the water coning behavior. The simulation results show that an increase in aquifer size causes lower gas recovery because the well has high degree of water influx and early water breakthrough. Increasing vertical to horizontal anisotropy ratio leads to early water breakthrough regardless of well types, completion length in vertical well and well location in horizontal well. High gas column thickness with strong aquifer is insensitive to water coning and the gas recovery is high as much as the well stands away from water contact. O n the other hand, thin gas column is dominated by water due to early water breakthrough. Increasing reservoir horizontal permeability can recover more gas owing to increasing of gas flow performance. The sensitivity of production acceleration shows that increasing of gas rate cannot increase gas recovery for both vertical and horizontal wells. When comparing the production sale present value, there is no difference of merit between vertical and horizontal we lls. However, horizontal well requires higher investment than vertical well. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. OTM-11-03 |
| 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; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng) - Asian Institute of Technology, 2011 |