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Underbalanced drilling (UBD)

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Proceedings Papers

Paper presented at the SPE/IADC Underbalanced Technology Conference and Exhibition, October 11–12, 2004
Paper Number: SPE-91558-MS
... Abstract UBD is defined as a drilling operation where the pressure of the circulating drilling fluid is lower than the pore pressure of the target formation of interest. The most widely recognised benefit of underbalanced drilling is the reduction of formation damage, in terms of minimising...
Proceedings Papers

Paper presented at the SPE Middle East Oil and Gas Show and Conference, September 25–28, 2011
Paper Number: SPE-141845-MS
... and appraisal wells historically involved lengthy multi-year multi-well programs due to inconclusive results from static logging, coring and well testing operations. In line with Shell's global initiative to use underbalanced drilling (UBD) for tight gas exploration and appraisal, UBD was implemented in SRAK's...
Proceedings Papers

Paper presented at the SPE/DGS Saudi Arabia Section Technical Symposium and Exhibition, May 15–18, 2011
Paper Number: SPE-149060-MS
.... In line with Shell's global initiative to use underbalanced drilling (UBD) for tight gas exploration and appraisal, UBD was implemented in SRAK's fifth exploration well in the Rub’Al-Khali. The deeper Palaeozoic reservoirs in the Rub’Al-Khali are known to be commonly tight and susceptible to near-wellbore...
Proceedings Papers

Paper presented at the SPE EUROPEC/EAGE Annual Conference and Exhibition, May 23–26, 2011
Paper Number: SPE-142892-MS
... simulation measurement error wellbore ubd data horizontal well reservoir model iteration oil rate permeability flow in porous media fluid dynamics reservoir simulator simulator underbalanced drilling automatic history Introduction Reservoir characterization using UBD data is one...
Journal Articles
Journal: SPE Journal
SPE J. 11 (02): 181–192.
Paper Number: SPE-81634-PA
Published: 19 June 2006
... and a conclusion is made. The transient behavior of the two-phase flow conditions in low-head drilling and UBD operations can be expressed with basis in the drift-flux formulation of the two-phase flow conservation laws ( Ishii 1975 ). Because of the complexity of the model, a numerical solution strategy...
Proceedings Papers

Paper presented at the SPE Europec/EAGE Annual Conference, June 13–16, 2005
Paper Number: SPE-93974-MS
... Abstract Underbalanced drilling (UBD) is defined as a drilling operation where the pressure of the circulating drilling fluid is lower than the pore pressure of the target formation of interest. The most widely recognised benefit of UBD is the reduction of formation damage by minimising...
Journal Articles
Journal: SPE Journal
SPE J. 8 (02): 160–170.
Paper Number: SPE-85061-PA
Published: 01 June 2003
...Q. T. Doan; M. Oguztoreli; Y. Masuda; T. Yonezawa; A. Kobayashi; S. Naganawa; A. Kamp Summary Underbalanced drilling (UBD) holds several important advantages over conventional drilling technology. These include minimization of formation damage, faster penetration rate, and ability for evaluation...
Proceedings Papers

Paper presented at the SPE/ICoTA Coiled Tubing & Well Intervention Conference & Exhibition, March 26–27, 2013
Paper Number: SPE-163932-MS
...; on the contrary, the density of fluid in underbalanced is lower than formation pressure. Based on this case, there are two types of UBD fluid available: natural gas (from the field) and nitrified mud. Gas drilling has UBD advantages resulting in high penetration rate, low bit cost, low water requirement...
Proceedings Papers

Paper presented at the Annual Technical Meeting, June 9–11, 1996
Paper Number: PETSOC-96-75
... are reserved. This is a pre-print and is subject to correction, _ ABSTRACT This paper reviews reservoir characteristics and properties which should be considered to ascertain if a Underbalanced drilling (UBD) is becoming increasingly reservoir is a prime candidate for an UBD operation. This utilized world wide...
Proceedings Papers

Paper presented at the Annual Technical Meeting, June 7–9, 1998
Paper Number: PETSOC-98-58
... is Underbalanced Drilling (UBD)? A rigorous definition ofUEID is the situation in which the exerted circulating pressure of the drilling fluid in contact with the formation is less than the effective pore pressure in the adjacent section of the matrix. The desirable course of action is to have this occur along...
Proceedings Papers

Paper presented at the Annual Technical Meeting, June 6–8, 1995
Paper Number: PETSOC-95-37
... fluid production rate carbonate reservoir skin factor drilling annular pressure drilling operator ubd total skin factor THE PETROLEUM SOCIETY OF elM PAPER 95-37 A Review of Underbalanced Drilling of Horizontal Wells in the Carbonate Reservoirs of Southeastern Saskatchewan (Case Study) S.J...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 8–10, 2004
Paper Number: PETSOC-2004-029
... objective annular pressure drilling vertical well sonatrach drilling fluids and materials drilling fluid management & disposal hmd field underbalanced condition bhcp valve crude oil ubd upstream oil & gas 6-in section nitrogen penetration rate reservoir injection...
Proceedings Papers

Paper presented at the SPE/IADC Middle East Drilling Technology Conference and Exhibition, October 24–26, 2011
Paper Number: SPE-148521-MS
... Abstract Recently, underbalanced drilling (UBD) has been used with increasing frequency to minimize problems associated with invasive formation damage which often greatly reduces the productivity of oil and gas reservoirs. When properly designed and executed, the benefits of underbalanced...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition and Conference, November 1–4, 2010
Paper Number: SPE-137289-MS
... Abstract Recently, underbalanced drilling (UBD) has been used with increasing frequency to minimize problems associated with invasive formation damage which often greatly reduces the productivity of oil and gas reservoirs. When properly designed and executed, the benefits of underbalanced...
Proceedings Papers

Paper presented at the SPE Oil and Gas India Conference and Exhibition, January 20–22, 2010
Paper Number: SPE-128876-MS
... Abstract Recently, underbalanced drilling (UBD) has been used with increasing frequency to minimize problems associated with invasive formation damage which often greatly reduces the productivity of oil and gas reservoirs. When properly designed and executed, the benefits of underbalanced...
Proceedings Papers

Paper presented at the SPE Oil and Gas India Conference and Exhibition, April 9–11, 2019
Paper Number: SPE-194558-MS
... Abstract Underbalanced drilling (UBD) is a method where equivalent circulating density (ECD) is kept less than the effective pore pressure of the zone being drilled by 100 psi or more. Drilling in an underbalanced state provides a unique opportunity to gather real-time virgin reservoir data...
Proceedings Papers

Paper presented at the SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition, January 28–29, 2008
Paper Number: SPE-114258-MS
... and safely to undertake underbalanced drilling (UBD) operations in the Ghawar field. Furthermore, the aim was also to verify whether it is possible to ship the produced sour crude to the nearby facilities without any environmental or operational concerns. This paper summarizes Saudi Aramco's experience...
Proceedings Papers

Paper presented at the Asia Pacific Oil and Gas Conference and Exhibition, October 30–November 1, 2007
Paper Number: SPE-108230-MS
..., it has also been proved that the advantages of underbalanced drilling are most evident in depleted reservoirs. Though there are some challenging issues with UBD such as bore hole instability problems due to the lack of positive support from the bore mud, these issues can be dealt with the evaluation...
Proceedings Papers

Paper presented at the IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, August 27–29, 2018
Paper Number: SPE-190973-MS
... as the drilling fluid. The use of WBM combined with fluid injection rate as well as the SBP on the choke manifold allows the projected equivalent circulation densities to be obtained IADC UBD Classification Based on the IADC Underbalanced Drilling Operations Committee Classification System...
Proceedings Papers

Paper presented at the EUROPEC/EAGE Conference and Exhibition, June 8–11, 2009
Paper Number: SPE-119211-MS
... program. It allowed NIDC to evaluate the degree of underbalanced conditions of the well and the productivity of the Asmari formation. Datalog software, for UBD equipment, was used on this well to capture the drilling parameters along with production data. The rig data acquisition program was tested prior...

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