Abstract
The PR-70 well, the third well of the National Iranian Drilling Company (NIDC) UBD campaign in Parsi field, is the first well to produce while drilling in a 2-year underbalanced drilling (UBD) project in the field. NIDC and Weatherford selected the UBD technique because of the depleted reservoir pressure, which had dropped to 2, 728 psi at depth of 2, 755m (5.8 ppg). Drilling such a depleted reservoir with conventional mud would have caused a huge overbalanced state, loss of circulation, and increased possibility of blowouts or damage to the reservoir. Another reason for implementing the UBD technique was to increase productivity of the well by decreasing formation damage that resulted from drilling fluid losses.This paper explains the execution of UBD technique at well PR-70. It also discusses the well design, UBD design parameters, underbalanced modeling considerations and the lessons learned from this job that all led to the success of this project. As soon as the well started to produce oil, UBD conditions were established and continued to TD.
| Original language | English |
|---|---|
| Title of host publication | Society of Petroleum Engineers - EUROPEC/EAGE Conference and Exhibition 2009 |
| Publisher | Society of Petroleum Engineers |
| ISBN (Print) | 9781613994276 |
| Publication status | Published - 1 Jan 2009 |
| Event | 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition - Amsterdam, Netherlands Duration: 8 Jun 2009 → 11 Jun 2009 |
Other
| Other | 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition |
|---|---|
| Country | Netherlands |
| City | Amsterdam |
| Period | 8/6/09 → 11/6/09 |
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ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Geochemistry and Petrology
Cite this
Underbalanced drilling in depleted formation achieves great success : Case study. / Shadravan, Arash; Khodadadian, Mohammad; Roohi, Abbas; Amani, Mahmood.
Society of Petroleum Engineers - EUROPEC/EAGE Conference and Exhibition 2009. Society of Petroleum Engineers, 2009.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Underbalanced drilling in depleted formation achieves great success
T2 - Case study
AU - Shadravan, Arash
AU - Khodadadian, Mohammad
AU - Roohi, Abbas
AU - Amani, Mahmood
PY - 2009/1/1
Y1 - 2009/1/1
N2 - The PR-70 well, the third well of the National Iranian Drilling Company (NIDC) UBD campaign in Parsi field, is the first well to produce while drilling in a 2-year underbalanced drilling (UBD) project in the field. NIDC and Weatherford selected the UBD technique because of the depleted reservoir pressure, which had dropped to 2, 728 psi at depth of 2, 755m (5.8 ppg). Drilling such a depleted reservoir with conventional mud would have caused a huge overbalanced state, loss of circulation, and increased possibility of blowouts or damage to the reservoir. Another reason for implementing the UBD technique was to increase productivity of the well by decreasing formation damage that resulted from drilling fluid losses.This paper explains the execution of UBD technique at well PR-70. It also discusses the well design, UBD design parameters, underbalanced modeling considerations and the lessons learned from this job that all led to the success of this project. As soon as the well started to produce oil, UBD conditions were established and continued to TD.
AB - The PR-70 well, the third well of the National Iranian Drilling Company (NIDC) UBD campaign in Parsi field, is the first well to produce while drilling in a 2-year underbalanced drilling (UBD) project in the field. NIDC and Weatherford selected the UBD technique because of the depleted reservoir pressure, which had dropped to 2, 728 psi at depth of 2, 755m (5.8 ppg). Drilling such a depleted reservoir with conventional mud would have caused a huge overbalanced state, loss of circulation, and increased possibility of blowouts or damage to the reservoir. Another reason for implementing the UBD technique was to increase productivity of the well by decreasing formation damage that resulted from drilling fluid losses.This paper explains the execution of UBD technique at well PR-70. It also discusses the well design, UBD design parameters, underbalanced modeling considerations and the lessons learned from this job that all led to the success of this project. As soon as the well started to produce oil, UBD conditions were established and continued to TD.
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M3 - Conference contribution
SN - 9781613994276
BT - Society of Petroleum Engineers - EUROPEC/EAGE Conference and Exhibition 2009
PB - Society of Petroleum Engineers
ER -