A New Azimuthal Deep-Reading Resistivity Tool for Geosteering and Advanced
Formation Evaluation

Bittar, Michael; Klein, James D.; Beste, Randy; Hu, Guoyu; Wang, Min; Pitcher, Jason L.; Golla, Chris; Althoff, Gary; sitka, Mark; minosyan, vadim; Paulk, Martin

doi:10.2523/109971-ms

Cited by 14 publications

(4 citation statements)

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“…In recent years, many oil service companies have been committed to the development of LWD tools for deeper DOD (Li et al 2005;Pamler et al 2008;Bittar et al 2007;Wei et al 2012), i.e. ultra-deep azimuthal EM resistivity LWD tools.…”

Section: Introductionmentioning

confidence: 99%

Coil optimization of ultra-deep azimuthal electromagnetic resistivity logging while drilling tool based on numerical simulation

Kang

Qin

Zhang

et al. 2022

J Petrol Explor Prod Technol

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This paper presents a coil optimization method of the ultra-deep azimuthal electromagnetic (EM) resistivity Logging While Drilling (LWD) to obtain the best parameters of the tool for formation boundary detection by theory. First, a rapid numerical simulation algorithm, i.e. the Fast Hankel Transform (FHT) method, is developed to simulate the logging responses of the layered formation. A system of double inclined coils is selected based on the response characteristics and the depth of detection (DOD) from four common coils. Simulation results demonstrated that the optimal coils are perfectly suitable for anisotropic formation. Then, the crucial parameters of the frequency and spacing of the selected coils with a DOD of 30 m are determined using the Picasso diagram. In addition, the influences of the electrical parameter of the drilling collar and resistivity anisotropy of the formation on the response are investigated. The results show that the conductivity of the drilling collar, the thickness and the resistivity anisotropy of the formation all affect the DOD. Finally, formation models with different layers are created to verify the performance and signal intensity. The results demonstrate that the optimized coils not only have a large DOD but also possess a high signal intensity, further confirming the advantages of the preferred coils. Compared with the conventional physical experiment tests, the method of coil optimization proposed in this paper is more economical and efficient. The findings of this study can help better understand the detection characteristics of the different coils, which can provide theoretical support for designing and developing a tool with the best boundary capability.

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Section: Introductionmentioning

confidence: 99%

Coil optimization of ultra-deep azimuthal electromagnetic resistivity logging while drilling tool based on numerical simulation

Kang

Qin

Zhang

et al. 2022

J Petrol Explor Prod Technol

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“…Geophysical resistivity measurements are used to map the subsurface, explore hydrocarbon reservoirs, and maximize the production of the existing ones. We categorize existing resistivity measurements as: (1) on surface, such as those obtained using controlled source electromagnetic (CSEM) [1][2][3][4][5] and Magnetotellurics (MT) [6,7]; and (2) borehole resistivity measurements, for example, those acquired using logging-while-drilling (LWD) devices [8][9][10][11][12][13][14][15][16][17][18][19]. LWD devices are useful both for reservoir characterization [20][21][22] and geosteering purposes [23,24], which is the act of adjusting the tool direction to travel through a specific zone.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, deep and extra-deep azimuthal logging devices have been introduced as a new type of LWD instruments [14,15]. In addition to map the subsurface, they help us to select the well trajectory properly in the hydrocarbon reservoir in order to increase the productivity of the well [14, [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 displays a typical deep azimuthal device incorporating tilted coils and operating at several frequencies. The main advantage of deep and extra-deep resistivity instruments in comparison to conventional LWD devices is their significantly longer depth of investigation, which enables to perform geosteering without crossing a water-saturated rock [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Borehole resistivity simulations of oil-water transition zones with a 1.5D numerical solver

Shahriari

Pardo

2020

Comput Geosci

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When simulating borehole resistivity measurements in a reservoir, it is common to consider an oilwater contact (OWC) planar interface. However, this consideration can lead to an unrealistic model since in the presence of capillary actions, the mix of two immiscible fluids (oil and water) often appears as an oil-water transition (OWT) zone. These transition zones may be significant in the vertical direction (20 meters or above), and in context of geosteering, an efficient method to simulate the OWT zone can maximize the production of an oil reservoir. Herein, we propose an efficient one and a half dimensional (1.5D) numerical solver to accurately simulate the OWT zone in an oil reservoir. Using this method, we can easily consider arbitrary resistivity distributions in the vertical direction, as it occurs in an OWT zone. Numerical results on synthetic examples demonstrate significant differences between the results recorded by a geosteering device when considering a realistic OWT zone vs an OWC sharp interface.

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Physics of Directional Electromagnetic Propagation Measurements‐While‐Drilling and Its Application to Forecasting Formation Boundaries

Wei¹,

Tian²,

Zhang³

et al. 2010

Chinese J of Geophysics

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The amplitude-attenuation and phase-shift of directional electromagnetic propagation measurementswhile-drilling are computed via the magnetic-current-source dyadic Green's functions for horizontally stratified anisotropic media. The detection range and the sensitivity to formation boundaries of directional electromagnetic measurements are analyzed. The influence of anisotropy, formation dip angle, and receiver antenna's tilting angle on directional measurements is studied. The results show that the directional detection range will increase with decreasing frequency, increasing coil spacing and increasing resistivity contrast between the target bed and shoulder bed. The change of directional amplitude-attenuation will become more obvious with increasing receiver antenna's tilting angle when the tool is approaching the formation boundary, and thus the sensitivity to formation boundaries will increase. The introduction of symmetrical antenna configuration can remove the dependence of directional signal on anisotropy and formation dip angle at locations far away from formation boundaries, and thus the formation boundaries can be accurately forecasted.

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A New Azimuthal Deep-Reading Resistivity Tool for Geosteering and Advanced Formation Evaluation

Cited by 14 publications

References 0 publications

Coil optimization of ultra-deep azimuthal electromagnetic resistivity logging while drilling tool based on numerical simulation

Coil optimization of ultra-deep azimuthal electromagnetic resistivity logging while drilling tool based on numerical simulation

Borehole resistivity simulations of oil-water transition zones with a 1.5D numerical solver

Physics of Directional Electromagnetic Propagation Measurements‐While‐Drilling and Its Application to Forecasting Formation Boundaries

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