Avoid Pilot Holes, Land Wells, and Optimize Well Placement and Production with Deep Directional Resistivity Logging-While-Drilling

Dupuis, Christophe; Mendoza-Barron, V.

doi:10.2118/169206-ms

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…To mitigate the depth uncertainty of the top of the reservoir, the deep directional resistivity service (DDR) was selected. Since its introduction, the DDR has been used extensively with a wide range of applications from landing, reservoir geosteering and mapping of reservoir or fluid boundaries (Beer et al 2010;Constable et al 2012;Neto et al 2012;Leveque et al 2012;Dupuis et al 2014). The DDR consists of a set of transmitter and receivers subs spaced out in the bottom hole assembly providing a range of transmitter-receiver spacings.…”

Section: Solutionmentioning

confidence: 99%

“…If the well is landed shallow, the production section would have a large area of unproductive and potentially unstable region. Landing deep would cause the well to produce with a high water-cut and leave significant attic oil in place as the well matured (Dupuis et al 2014). Using real-time logging-while-drilling measurements to land the well in the upper section of reservoir and away from the OWC was the most crucial part of the project.…”

Section: Landing Section Of B10st01mentioning

confidence: 99%

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Real Time Reservoir Mapping While Drilling Reduces Risks, Geological and Fluid Position Uncertainty in the Gulf of Mexico

Leveque

Wolfarth

Walz

et al. 2016

Day 1 Tue, March 01, 2016

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Reservoirs in the Northern Gulf of Mexico (NGOM) are predominantly drilled with low angle wells. Drilling a well horizontally presents its own set of challenges.The Mississippi Canyon block 22/21 operated by ANKOR Energy embodies the significant drilling challenges sometimes found in the NGOM reservoirs. The ЉH SandЉ reservoir is a low resistivity (3 to 5 ohm.m) reservoir bounded by a northeast southwest fault. The overburden is uniform for more than 200ft TVD above the reservoir, making the landing challenging with conventional well placement techniques. The operator was planning a 2200ft lateral section to be drilled close to the Gas Oil Contact (GOC). Early water production was observed in the offset well located at the toe of the planned well, questioning the current position of the Oil Water Contact (OWC). Landing this well is challenging from both a geological and drilling point of view as a 3D trajectory is required to avoid the fault and offset wells.In light of these challenges, the operator decided to use the very-deep electromagnetic (EM) directional resistivity tool with its detection range of more than 100ft, enabling the detection of the top of the H sand reservoir long before landing. In the lateral section, the tool was used in conjunction with an integrated petrophysical platform to map the top of the reservoir, detect the OWC and identify the lithology and fluids present while drilling.While landing the well, the top of the H sand reservoir was detected 48ft TVD away -10ft deeper than expected. The very-deep directional resistivity tool enabled the well to be confidently landed despite the lack of correlation markers and depth uncertainty of the ЉH SandЉ reservoir. The OWC was detected more than 70ft below the well during the landing section even though the bit had not penetrated the H sand reservoir yet. The top of the reservoir and the OWC were mapped throughout the length of the lateral section along with the lithology and fluid content. Towards the toe of the lateral section, near a producing offset well, the OWC, still 50ft below the current trajectory, was observed to be rising up and getting closer to the well. Total Depth (TD) was called early to avoid premature water production. Water coning was confirmed as the reason behind early water production in the offset well.The use of this technology during the landing and the lateral section of the well reduced dramatically the risk associated with geological uncertainty as well as fluid contact position providing critical information for field management planning.

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Section: Solutionmentioning

confidence: 99%

Section: Landing Section Of B10st01mentioning

confidence: 99%

Real Time Reservoir Mapping While Drilling Reduces Risks, Geological and Fluid Position Uncertainty in the Gulf of Mexico

Leveque

Wolfarth

Walz

et al. 2016

Day 1 Tue, March 01, 2016

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“…Thus, modern geosteering is heavily dependent on real-time interpretation of deep EM measurements [1], [2], [3], [4, ]. Current generation of Extra-Deep EM tools (also referred to as Ultra-Deep EM) can detect remote boundaries up to 200 ft. away from measurement location [5, ], and recent publications have even revealed sensitivity ahead of bit [6, ].…”

Section: Introductionmentioning

confidence: 99%

Modeling extra-deep electromagnetic logs using a deep neural network

Alyaev,

Shahriari,

Pardo

et al. 2020

Preprint

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Modern geosteering is heavily dependent on real-time interpretation of deep electromagnetic (EM) measurements. This work presents a deep neural network (DNN) model trained to reproduce the full set of extra-deep real-time EM logs consisting of 22 measurements per logging position. The model is trained in a 1D layered environment and has sensitivity for up to seven layers with different resistivity values. A commercial simulator provided by a tool vendor is utilized to generate a training dataset. The impossibility of parallel execution of the simulator effectively limits the permissible dataset size. Therefore, the geological rules and geosteering specifics supported by the forward model are embraced when designing the dataset. It is then used to produce a fully parallel EM simulator based on a DNN without access to the proprietary information about the EM tool configuration or the original simulator source code. Despite a relatively small training set size, the resulting DNN forward model is quite accurate for synthetic geosteering cases, yet independent of the logging instrument vendor. The observed average evaluation time of 0.15 milliseconds per logging position makes it also suitable for future use as part of evaluation-hungry statistical and/or Monte-Carlo inversion algorithms.

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Geo-Stopping Using Deep Directional Resistivity LWD: A New Method for Well Bore Placement Using Below-the-Bit Resistivity Mapping

Upchurch

Saleem

Russell

et al. 2015

Day 1 Tue, March 17, 2015

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The Wheatstone LNG Project in Western Australia utilizes subsea big-bore gas wells for producing the Wheatstone and Iago gas accumulations. These wells employ a 9-5/8” production conduit from the top of the gas pay zone to gas the ocean floor to maximize their productive capacity. A critical design requirement is that the 9-5/8” production conduit must be set as close as possible to the gas pay zone (i.e., within 3m or less) without actually penetrating into the productive core of the gas zone. The wells must also intersect the horizontal top of the gas zone at inclinations (inc) of 45-60°. These design requirements impose a significant challenge to the efficient execution of a Wheatstone well. Traditional “ahead-of-the-bit” logging-while-drilling (LWD) solutions are capable of detecting resistivity fluctuations up to 1m in front of the drill bit. This, however, was considered an insufficient look-ahead distance to prevent premature penetration of the gas reservoir. Alternative solutions, such as pilot holes and biostratigraphic analysis of drilled cuttings, were also considered but found to be either too expensive and/or operationally impractical. During an exhaustive search for a potential solution to this dilemma, the Wheatstone Project team reviewed a new Reservoir Mapping-While-Drilling technology being field tested1,2,3,5,7,8,9,10,11,12 for in-zone steering of horizontal wells and/or landing such wells at shallow angles of incidence relative to formation bedding (i.e., < 13°). That technology, based on Deep Directional Resistivity (DDR) technology, was recognized as a potential solution by the Wheatstone Project team – assuming it would work in an application for which it was neither designed nor intended (i.e., angles of incidence as high as 30-45°). Ultimately, the technology was successfully tested at Wheatstone, and is now the Project's default method for landing all big-bore gas wells to the exacting level of accuracy described above. This paper details (1) the safety and well design drivers that precipitated the need for using DDR technology, (2) the physics and logic of this LWD system, (3) the new concept for applying the system in non-horizontal applications and (4) the observed results from the six wells that have, so far, been drilled at Wheatstone.

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Avoid Pilot Holes, Land Wells, and Optimize Well Placement and Production with Deep Directional Resistivity Logging-While-Drilling

Cited by 10 publications

References 7 publications

Real Time Reservoir Mapping While Drilling Reduces Risks, Geological and Fluid Position Uncertainty in the Gulf of Mexico

Real Time Reservoir Mapping While Drilling Reduces Risks, Geological and Fluid Position Uncertainty in the Gulf of Mexico

Modeling extra-deep electromagnetic logs using a deep neural network

Geo-Stopping Using Deep Directional Resistivity LWD: A New Method for Well Bore Placement Using Below-the-Bit Resistivity Mapping

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