Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Al-Mudhhi, Mohammed Abdullah; Mark, Shouxiang; Al-Hajari, Abdrabrasool; Lewis, Kenneth A.; Berberian, Garo; Butt, Parvez Jamil; Richter, Peter J.

doi:10.2523/iptc-10077-ms

Cited by 22 publications

(5 citation statements)

References 11 publications

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“…The LWD tools consisted of gamma gay (GR), density, neutron and resistivity (triple combo) measurements (Mudhhi, M. et al 2005). The LWD tools consisted of gamma gay (GR), density, neutron and resistivity (triple combo) measurements (Mudhhi, M. et al 2005).…”

Section: Re-development Strategymentioning

confidence: 99%

Maximizing Recovery of Attic Oil from Highly-Fractured Crestal Area Using Horizontal Skimmers: A Case Study

Al-Julaih¹,

Fischbuch²,

Pinero³

et al. 2010

Proceedings of SPE/DGS Saudi Arabia Section Technical Symposium and Exhibition

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This paper presents the re-development strategy employed to recover attic oil from the highly-fractured crestal area of a carbonate reservoir. Optimum re-development strategies for the crestal area, along with planning and execution incorporating Best in Class (BiC) reservoir management practices are discussed.The crestal area was previously developed using full penetration vertical wells. After many years of continuous production and nearby injection, oil production rates in these crestal wells have declined with increasing water cut.The re-development strategy has been tailored to exploit this challenging opportunity and to maximize the production efficiently with selective placement of horizontal skimmer wells at the very top of the structure. Fit-for-purpose completion technologies were deployed to address the effects of the extensive fractures. Tapping oil continuously flowing into the crestal area by displacement, gravity, and capillary mechanisms, this re-development strategy has resulted in efficient and sustainable production.

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Section: Re-development Strategymentioning

confidence: 99%

Maximizing Recovery of Attic Oil from Highly-Fractured Crestal Area Using Horizontal Skimmers: A Case Study

Al-Julaih¹,

Fischbuch²,

Pinero³

et al. 2010

Proceedings of SPE/DGS Saudi Arabia Section Technical Symposium and Exhibition

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“…The rotary steerable system [1][2][3][4][5][6][7] (RSS) was used to drill the landing and the horizontal section of the 5 producers and the water re-injection well.…”

Section: Benefits Of Point the Bit Rss For The Re-developmentmentioning

confidence: 99%

“…The RSS assembly, also refereed to as point-the-bit technology, used for the re-development drilling in this paper has a steering assembly that continuously orients the tilted bit shaft to control the drilling direction and the dogleg severity of the borehole 1,5 . The tool does not push against the borehole to build angle, and is therefore more effective for steering.…”

Section: Benefits Of Point the Bit Rss For The Re-developmentmentioning

confidence: 99%

“…By monitoring in realtime distance to formation boundary up to 15feet around the wellbore, boundaries can be detected allowing for sufficient time to make trajectory adjustment to stay within the reservoir 1,9 . It was placed above RSS for GR Images and near-bit ressitivity measurements in real time both in the Directional Deep Resistivity Tool.…”

Section: Resistivitymentioning

confidence: 99%

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Dumbarton Field, UKCS: Rapid Redevelopment of a Complex, Mature North Sea Asset Using New Rotary-Steerable and Geosteering Technologies

John

Stewart²,

Tribe

et al. 2008

All Days

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The Dumbarton Field, operated by Maersk Oil North Sea in Block 15/20 has a number of drilling and well placement challenges, which hampered development during the 80's and 90's when operated by the previous owner. These include formation instability, directional-drilling control issues and thin complex reservoirs which are poorly imaged on seismic. Reservoir overburden is fast drilling formations with hard stringers. The field pore-pressure gradient is at 9.07ppg EMW but mud density needed for wellbore stability is greater than 11.6ppg. This resultant high overbalance and other issues such as hole cleaning, complex directional profile, ECD management at high ROPs, can lead to inefficient motor drilling. The soft formations also create limitations for push-the-bit rotary steerable systems to deliver the required directional performance to land wells.To overcome these drilling challenges a new point-the-bit, rotary steerable system with a high dogleg capability has been utilised for successful landing of these wells into reservoir sections without need for pilot holes or mechanical sidetracks. Additionally a new LWD tool that allows monitoring of the distance and direction to formation boundaries up to 15 ft away from the wellbore has been used to proactively guide the wells along the thin oil reservoir units/sands. These tools also enabled the wells to be placed as close to the reservoir roof shales as possible to maximize stand-off from the waterleg and hence increase overall oil recovery. Distance and direction to boundary data displays are intuitive to interpretation allowing better geosteering decisions without compromising ROP and drilling efficiency.Within six months six wells were delivered including three sidetracks (One top hole and two horizontal sections). All wells penetrated more reservoir sand than prognosed and all were drilled faster than prognosed. Initial production testing was higher than expectation.

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“…Density and shallow resistivity images were affected by borehole rugosity and breakout at the top of the borehole and this affected the top anhydrite detection. Deep resistivity image with depth of investigation of 5 inches was not affected by this borehole breakout and a geosteering decision was made after detecting the approaching top anhydrite (Mudhhi, et al, 2005).…”

Section: Stand-off Effect On Lwd Datamentioning

confidence: 99%

Borehole Shape Characterization With Azimuthal LWD Measurements: Evaluation, Applications, and Limitations

Butt¹,

Fareed²,

Ma³

2007

Proceedings of SPE/IADC Middle East Drilling and Technology Conference

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TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractCaliper is a fundamental measurement of wellbores. It has significant impacts on decision making regarding well completion and monitoring operations. Traditional Calipers are measured mechanically, thus can not be performed while drilling since they will not be able to survive the harsh conditions of drilling while the bottom hole assembly (BHA) rotates. With logging while drilling (LWD) measurements, several methods have been developed over the years to derive borehole calipers or hole shape indicators from LWD logs. In this paper, we will compare the LWD derived calipers with that obtained from wireline (WL) and summarize the developments, utilizations, and limitations of LWD derived calipers. Factors affecting LWD calipers will also be discussed to help operation petrophysicists for better log data quality control.Examples will also be shown for using LWD calipers to identify borehole washout, elipticity, breakout, and spiral-hole conditions. Knowing these borehole conditions in real time can help to make action plans to improve drilling practices and reduce drilling risks. After drilling, LWD calipers are used to correct LWD logs for borehole size effects and guide well completions.

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Geo-Steering with Advanced LWD Technologies - Placement of Maximum Reservoir Contact Wells in a Thinly Layered Carbonate Reservoir

Cited by 22 publications

References 11 publications

Maximizing Recovery of Attic Oil from Highly-Fractured Crestal Area Using Horizontal Skimmers: A Case Study

Maximizing Recovery of Attic Oil from Highly-Fractured Crestal Area Using Horizontal Skimmers: A Case Study

Dumbarton Field, UKCS: Rapid Redevelopment of a Complex, Mature North Sea Asset Using New Rotary-Steerable and Geosteering Technologies

Borehole Shape Characterization With Azimuthal LWD Measurements: Evaluation, Applications, and Limitations

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