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2019

Friction reduction system aids optimized bent-motor BHA to drill Vietnam’s longest basement section

Operator drilled section to TD and connected all targets despite extreme difficulties encountered in this complex wellbore By Son Bui, Thang Long Joint Operating Company; Ngo Huu Hai, Petrovietnam Exploration Production Corp; Nam Nguyen, Geoff Blackwell and Jake Tretheway, National Oilwell Varco Thang Long Joint Operating Company (TLJOC) was operating a well in the Cuu Long Basin offshore Southern Vietnam and needed to more effectively drill through a difficult section. Granitic basement drilling, where the formation is very hard (35 to 40 kpsi UCS), presented major challenges, as PDC cutters could not drill through the formation, very high levels of vibration were encountered, and rate of penetration (ROP) was limited. Despite the inherent risk of drilling such a well, TLJOC ...

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Landing string buoyancy technology allows deployment of longer, heavier casing while reducing rig time

System uses buoyancy modules to provide uplift force that can offset landing string weight by up to 80% By Chris von Eberstein, Landing String The deepwater drilling industry has always required a variety of new and reliable technologies to push operational limits further as operators seek to explore deeper reservoirs around the world. As deeper waters are explored, casing design is also becoming more complex and casing strings becoming longer and heavier. The demand for deeper wells, combined with more complex well designs, are driving operators to either upgrade equipment or to design around current equipment limitations. While operators recognize the physical limitations of today’s mechanical systems and supporting structures, they are still aggressively pursuing new technologies with the potential ...

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Overcoming learning curve leads to successful deployment of dissolvable plugs in Chinese shales

Understanding reasons why dissolvable frac plugs might not dissolve helps suppliers to address operational challenges, provide better operator experiences By Jack Wang, Vertechs Oil & Gas Technology Unconventional oil and gas development is on fast track. This is rapidly reshaping the technologies we know and continues to encourage performance, competition and innovation. But a learning curve must be overcome before a new technology can become an industry standard. This article will provide an introductory overview of dissolvable downhole technologies, particularly the challenges and failures that were encountered when they were introduced to the Chinese market in early 2016. Three years ago, China expanded the scale of its shale gas development. To maximize production, longer laterals were drilled. However, this came ...

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Rotary steerable technology helps operators to beat AFE timelines in Granite Wash, Midland Basin wells

Point-the-bit RSS proves value in drilling of complicated wellbore trajectories in harsh environments, saves 8 days of drilling in one well’s lateral section By John Evans and Brian Jansky, Gyrodata One of the most significant drilling advancements in the petroleum industry in recent years has been the development of rotary steerable systems (RSS), which have proven valuable for directional and horizontal drilling. The first commercial use of Gyrodata’s RSS tool was in 1993. At that time, it was called an automated guidance system. These systems use specialized downhole technologies to replace conventional directional tools, such as mud motors. RSS technology allows guidance of the well trajectory while the drill string continuously rotates. This eliminates the need for an operator to ...

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Hybrid system taps benefits of both MPD, underbalanced drilling, opens new horizons in southern Pakistan

Application of hybrid system allows operator to drill through, case off complicated sequence of formations without need for additional casing string By Qasim Ashraf, Weatherford International The northern Pothohar plateau of Pakistan is known to bear significant oil and gas reserves. Due to severe geological uncertainties, the area exhibits the most challenging drilling conditions in the region. The subject field is located in the southern part of the Pothohar plateau. Drilling challenges of severe loss circulation, high-pressure water influxes, low rate of penetration (ROP), simultaneous loss/gain issues and depleted reservoir formations are the most common problems experienced in the area. The subject well was a reentry well where the objective of the operator was to drill and produce the deeper ...

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North Sea HPHT case study: Monitoring of underreamer function status confirms in-gauge hole

Monitoring system helps Total to improve certainty around underreamed hole diameter By Tom Huggett, National Oilwell Varco; Mohammad Alahmad and Oliver Eatough, Total Underreaming tools are frequently needed in challenging applications, such as to facilitate running expandable liners, but underreaming operations can frequently leave uncertainty on final hole diameter. National Oilwell Varco (NOV) developed the IQ underreamer monitoring system to remove this uncertainty by monitoring cutter block position, wear and vibration, data that could be used in post-run drilling analyses as part of an optimization plan for future wells. The system also records downhole drilling dynamics at the underreamer, which means the system can determine, via memory data, the actual underreamer expansion size at any point during the run, allowing ...

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Intervention equipment, planning can mitigate complexities that come with multiwell pad spacing

With high-density well spacing, additional considerations are needed around equipment placement and how one well affects other wells on the same pad By Joe Coleman and Cliff Meade, Wild Well Control An intervention operation on one well that goes poorly can affect adjacent wells and cause an even greater problem. Well spacing on multiwell pads becomes an issue that concerns equipment placement footprints. Hot Tap, Valve Drilling and Freeze services can be used for gaining well access and placing temporary mechanical barriers when circumstances do not allow for conventional intervention methods. Freeze Operations Freeze operations can be used in compact spaces and are beneficial for use on multiwell pads. Freeze services have been used for many years to place a ...

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New data transfer protocol aims to bring Netflix streaming speeds to offshore drilling operations

Equinor set to commercially deploy Energistics Transfer Protocol with 2 new monitoring centers opening this year By Sarah Junek, Associate Editor Imagine driving your car using only the rearview mirror for steering. Similarly in drilling, large amounts of data are being collected at the rig site, and experts in onshore offices are assigned to analyze that data and assist in deciding what happens next. Yet, data transfer from offshore rigs to shore can be delayed anywhere from tens of seconds to tens of minutes. This lag is due to the commonly used data transfer method for drilling measurement data, known as Simple Object Access Protocol (SOAP). It inherently acts as a bottleneck by its use of server relays that have ...

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New-generation shaped cutter elements expand capabilities of PDC bits to boost ROP, efficiency

Performance proven through case studies spanning Russia, Colorado’s DJ Basin, Marcellus and Colombia By Wiley Long, Smith Bits, a Schlumberger company Since it was introduced to the oilfield more than 40 years ago, the polycrystalline diamond compact (PDC) bit has emerged as one of the most significant step-changes in drilling tool technology. Continuing advances in the material properties and manufacturing processes used to fabricate the cutting structures of the bit have enabled the industry to tap into formations once deemed drillable only with roller cone bits, simultaneously improving average rates of penetration (ROP) by 60%. This evolution in performance has elevated the PDC bit to a position of global dominance, giving operators the ability to expand into new frontiers, including ...

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