Abstract
The work in this paper is a result of a problem encountered in producing a low permeability formation from a hydraulically fractured well in South Texas. The well was producing from a tight gas condensate reservoir and there was concern about damaging the well if the wellbore pressure fell below the dew point. However, it turned out that condensate damage was not a problem. Lower wellbore pressures only resulted in higher rates. This study employs analytical methods to evaluate production impairment by use of fracture face skin concept, sff, which is a permeability reduction normal to the face of the fracture. Due to very tight formation and presence of infinite conductivity fracture which propagates the entire drainage boundary of the well, the flow pattern from the formation into the hydraulic fracture is linear. The reservoir was modeled by a synthetic single phase linear model and the simulation results were compared to analytical solutions. In order to investigate if the analytical equations properly quantify the production impairment, at this stage the single phase fluid model was used to ignore productivity decrease due to condensate damage. Single-phase damage analysis shows that for a linear reservoir producing at constant rate conditions, Sff is additive to the analytical solutions. It also shows that Sff calculated in transient and pss periods are identical to that calculated by using Cinco and Samaniego equation. The same analysis for the constant pwf case assuming that the S ff is additive to the analytical solutions shows that the calculated skin in transient period changes with time.
| Original language | English |
|---|---|
| Title of host publication | SPE Latin American and Caribbean Petroleum Engineering Conference |
| Pages | 1381-1392 |
| Number of pages | 12 |
| Volume | 3 |
| Publication status | Published - 2007 |
| Externally published | Yes |
| Event | SPE 10th Latin American and Caribbean Petroleum Engineering Conference, X LACPEC 07 - Buenos Aires, Argentina Duration: 15 Apr 2007 → 18 Apr 2007 |
Other
| Other | SPE 10th Latin American and Caribbean Petroleum Engineering Conference, X LACPEC 07 |
|---|---|
| Country | Argentina |
| City | Buenos Aires |
| Period | 15/4/07 → 18/4/07 |
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ASJC Scopus subject areas
- Geology
Cite this
Analytical evaluation of gas/condensate skin in hydraulically fractured wells. / Ravari, Reza Rostami; Wattenbarger, Robert A.; Doust, Alireza Rezaei; Amani, Mahmood.
SPE Latin American and Caribbean Petroleum Engineering Conference. Vol. 3 2007. p. 1381-1392.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Analytical evaluation of gas/condensate skin in hydraulically fractured wells
AU - Ravari, Reza Rostami
AU - Wattenbarger, Robert A.
AU - Doust, Alireza Rezaei
AU - Amani, Mahmood
PY - 2007
Y1 - 2007
N2 - The work in this paper is a result of a problem encountered in producing a low permeability formation from a hydraulically fractured well in South Texas. The well was producing from a tight gas condensate reservoir and there was concern about damaging the well if the wellbore pressure fell below the dew point. However, it turned out that condensate damage was not a problem. Lower wellbore pressures only resulted in higher rates. This study employs analytical methods to evaluate production impairment by use of fracture face skin concept, sff, which is a permeability reduction normal to the face of the fracture. Due to very tight formation and presence of infinite conductivity fracture which propagates the entire drainage boundary of the well, the flow pattern from the formation into the hydraulic fracture is linear. The reservoir was modeled by a synthetic single phase linear model and the simulation results were compared to analytical solutions. In order to investigate if the analytical equations properly quantify the production impairment, at this stage the single phase fluid model was used to ignore productivity decrease due to condensate damage. Single-phase damage analysis shows that for a linear reservoir producing at constant rate conditions, Sff is additive to the analytical solutions. It also shows that Sff calculated in transient and pss periods are identical to that calculated by using Cinco and Samaniego equation. The same analysis for the constant pwf case assuming that the S ff is additive to the analytical solutions shows that the calculated skin in transient period changes with time.
AB - The work in this paper is a result of a problem encountered in producing a low permeability formation from a hydraulically fractured well in South Texas. The well was producing from a tight gas condensate reservoir and there was concern about damaging the well if the wellbore pressure fell below the dew point. However, it turned out that condensate damage was not a problem. Lower wellbore pressures only resulted in higher rates. This study employs analytical methods to evaluate production impairment by use of fracture face skin concept, sff, which is a permeability reduction normal to the face of the fracture. Due to very tight formation and presence of infinite conductivity fracture which propagates the entire drainage boundary of the well, the flow pattern from the formation into the hydraulic fracture is linear. The reservoir was modeled by a synthetic single phase linear model and the simulation results were compared to analytical solutions. In order to investigate if the analytical equations properly quantify the production impairment, at this stage the single phase fluid model was used to ignore productivity decrease due to condensate damage. Single-phase damage analysis shows that for a linear reservoir producing at constant rate conditions, Sff is additive to the analytical solutions. It also shows that Sff calculated in transient and pss periods are identical to that calculated by using Cinco and Samaniego equation. The same analysis for the constant pwf case assuming that the S ff is additive to the analytical solutions shows that the calculated skin in transient period changes with time.
UR - http://www.scopus.com/inward/record.url?scp=34547862427&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34547862427&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:34547862427
SN - 1604230096
SN - 9781604230093
VL - 3
SP - 1381
EP - 1392
BT - SPE Latin American and Caribbean Petroleum Engineering Conference
ER -