Underbalanced drilling: Praises and perils

Journal Article · Tue Dec 01 04:00:00 EST 1998 · SPE Drilling and Completion

DOI:https://doi.org/10.2118/52889-PA· OSTI ID:321066

Bennion, D B; Thomas, F B; Bietz, R F; Bennion, D W ^[1]

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1. Hycal Energy Research Labs., Ltd., Calgary, Alberta (Canada)

Underbalanced drilling (UBD) has been used with increasing frequency to minimize problems associated with invasive formation damage, which often greatly reduce the productivity of oil and gas reservoirs, particularly in openhole horizontal well applications. UBD, when properly designed and executed, minimizes or eliminates problems associated with the invasion of particulate matter into the formation as well as a multitude of other problems such as adverse clay reactions, phase trapping, precipitation, and emulsification, which can be caused by the invasion of incompatible mud filtrates in an overbalanced condition. In many UBD operations, additional benefits are seen because of a reduction in drilling time, greater rates of penetration, increased bit life, a rapid indication of productive reservoir zones, and the potential for dynamic flow testing while drilling. Potential downsides and damage mechanisms associated with UBD will be discussed. These include the following: (1) Increased cost and safety concerns; (2) Difficulty in maintaining a continuously underbalanced condition; (3) Spontaneous inhibition and countercurrent inhibition effects; (4) Glazing, mashing, and mechanically induced wellbore damage; (5) Macroporosity gravity-induced invasion; (6) Difficulty of application in zones of extreme pressure and permeability; and (7) Political/career risk associated with championing a new and potentially risky technology. The authors discuss reservoir parameters required to design an effective underbalanced or overbalanced drilling program, laboratory screening procedures to ascertain the effectiveness of UBD in a specific application and review the types of reservoirs that often present good applications for UBD technology.

• Sponsoring Organization: USDOE
• OSTI ID: 321066
• Journal Information: SPE Drilling and Completion, Journal Name: SPE Drilling and Completion Journal Issue: 4 Vol. 13; ISSN 1064-6671; ISSN SDCOE5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
DIRECTIONAL DRILLING
FORMATION DAMAGE
NATURAL GAS WELLS
OIL WELLS
PRESSURE CONTROL
RESERVOIR ENGINEERING
WELL DRILLING