Underbalanced Drilling For Production Enhancement in the Rasau Oil Field, Brunei

Sarssam, Mark; Peterson, Russell L.; Ward, Mike; Elliott, David; McMillan, Scott

doi:10.2118/85319-ms

Cited by 10 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…UBD, on the other hand, has long been employed to solve both drilling-related and reservoir-related problems. [3][4][5] From this explanation; it is obvious that the critical difference between UBD and MPD will lie in the degree of resolution attainable with each method for both the drilling-related and reservoir/production-related problems.…”

Section: Comparison Of Ubd and Mpdmentioning

confidence: 99%

Comparisons of Reservoir Knowledge, Drilling Benefits, and Economic Advantages for Underbalanced and Managed-Pressure Drilling

Finley

Ansah

Gil

et al. 2007

Proceedings of IADC/SPE Managed Pressure Drilling &Amp; Underbalanced Operations

View full text Add to dashboard Cite

TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractUnderbalanced drilling (UBD) and managed pressure drilling (MPD) are gaining in popularity as drilling methodologies to overcome some of the problems faced in conventional overbalanced drilling. These techniques are complimentary technologies rather than completely separate techniques, MPD techniques at one time having been classified under UBD. Therefore, with the current terminology and the many similarities they are often confused with one another. Underbalanced drilling is a tool both for reservoir performance improvement and reservoir characterization as well as for addressing drilling problems. MPD, on the other hand, is primarily a solution for mitigating drilling related problems. Both result in a reduction of non-productive time (NPT). Sometimes a combination of both techniques may be required for the same well.Different operators have chosen UBD and MPD with the goal of curtailing severe fluid losses and other drilling-related problems associated with conventional overbalanced drilling. Often times, while applying this technique to solve these drilling problems, the reservoir benefits have become apparent and have convinced the operators to go to full underbalance to realize the full reservoir production benefits without any period of overbalance throughout drilling, tripping, and completion operations. They have often found that when using UBD for reservoir production improvement, it is possible to perform comprehensive characterization of the reservoir while drilling. In some cases, zones that were not seen as productive during overbalanced operations have come to light, and reservoir characterization has enabled appraisal of these formations. Reservoir information obtained during the drilling phase can significantly reduce the time and cost associated with gathering and analyzing "well test" type data post-completion with conventional methods and these methods have been field tested and results compared to conventional well testing with favorable results.

show abstract

Section: Comparison Of Ubd and Mpdmentioning

confidence: 99%

Comparisons of Reservoir Knowledge, Drilling Benefits, and Economic Advantages for Underbalanced and Managed-Pressure Drilling

Finley

Ansah

Gil

et al. 2007

Proceedings of IADC/SPE Managed Pressure Drilling &Amp; Underbalanced Operations

View full text Add to dashboard Cite

show abstract

“…UBD, on the other hand, has long been employed to solve both drilling-related and reservoir-related problems. [5][6][7] One can, therefore, deduce that the critical difference between UBD and MPD lies in the degree of resolution attainable with each method for both the drillingrelated and reservoir/ production-related problems.…”

Section: Comparison Of Ubd Versus Mpdmentioning

confidence: 99%

Reservoir Knowledge and Drilling—Benefits Comparison for Underbalanced and Managed Pressure Drilling Operations

Finley

Shayegi

Ansah

et al. 2006

Proceedings of SPE/IADC Indian Drilling Technology Conference and Exhibition

View full text Add to dashboard Cite

TX 75083-3836, U.S.A., fax 1.972.952.9435. AbstractThe industry is now becoming more knowledgeable concerning underbalanced drilling (UBD) and managed pressure drilling (MPD). These techniques are gaining popularity because of their capability to control severe fluid losses and other problems that are inherent to conventional overbalanced drilling. As a result, considerable increase in their usage has been noted; however, with these increases, it has become apparent that there is a great deal of confusion concerning the basic concepts of each technique and when each should be used. Generally speaking, UBD can be described as a reservoir performance improvement and characterization tool that also provides drilling benefits. Another advantage is that UBD can offer a unique well testing environment in which the properties of reservoir layers can be determined while drilling. MPD, on the other hand, primarily addresses drilling-related problems that result in nonproductive time (NPT) in drilling scenarios. Sometimes, however, there are well scenarios in which both techniques might be needed in different hole sections.Reservoir information gained during underbalanced drilling also can help reduce the time and cost associated with gathering and analyzing well-test data post-completion with conventional methods. Techniques have been developed to quantify reservoir properties and characteristics for homogenous and heterogeneous and/or fractured reservoir systems.This paper focuses on where each concept should be used and what benefits can be expected from their application. Results from UBD and MPD case histories are used to quantify the results from these operations. Differences between the two techniques concerning equipment requirements and reservoir characterization potential are also analyzed.

show abstract

“…[1][2][3][4][5][6][7] Additionally, possible benefits derived from UBD include an increase in rate of penetration (ROP), an increase of bit life, and early production of hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Underbalanced Drilling of a Horizontal Well in Depleted Reservoir: A Wellbore Stability Perspective

Qiu

Gerryo²,

Tan³

et al. 2007

Proceedings of SPE Middle East Oil and Gas Show and Conference

View full text Add to dashboard Cite

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe need to reduce formation damage and to avoid differential sticking and lost circulation in depleted reservoirs favors the use of underbalanced drilling (UBD) technology. In highly depleted reservoirs, the pore pressure can be very low, necessitating the use of extremely low-density fluid to achieve an equivalent circulating density (ECD) below the pore pressure. In such situations, the stress redistribution around the wellbore has to be supported mainly by the rock matrix, and limited support is provided by the mud pressure. Therefore, UBD can dramatically increase the risk of wellbore instability.From literature review, it was found that the techniques and methodologies to carry out wellbore stability analysis on UBD of horizontal wells are not well documented. This paper presents a wellbore stability study that was conducted to evaluate the feasibility of using UBD technology to drill a horizontal well in a highly depleted reservoir in Libya.The study started with geomechanical laboratory tests and Mechanical Earth Model (MEM) construction to evaluate the in-situ stresses, pore pressure, and mechanical properties of the formations likely to be encountered during the planned UBD campaign.Wellbore stability analysis was subsequently conducted for the planned horizontal well to be drilled underbalance using a new practical approach. The analysis revealed a high probability of extensive and severe breakout within the weak zones if penetrated underbalanced and the potential for massive wellbore collapse. Under the guidance of this study, the well plan and drilling designs were amended to minimize drilling risk.

show abstract

Underbalanced Drilling For Production Enhancement in the Rasau Oil Field, Brunei

Cited by 10 publications

References 4 publications

Comparisons of Reservoir Knowledge, Drilling Benefits, and Economic Advantages for Underbalanced and Managed-Pressure Drilling

Comparisons of Reservoir Knowledge, Drilling Benefits, and Economic Advantages for Underbalanced and Managed-Pressure Drilling

Reservoir Knowledge and Drilling—Benefits Comparison for Underbalanced and Managed Pressure Drilling Operations

Underbalanced Drilling of a Horizontal Well in Depleted Reservoir: A Wellbore Stability Perspective

Contact Info

Product

Resources

About