Mud invasion and array laterolog responses in horizontal well based on numerical simulation

Jiang, Yanjiao; Sun, Jianmeng; Gao, Jun; Cui, Jiangman

doi:10.1088/1742-2132/14/1/15

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…A limited-size 3D single well formation model was established to simulate the mud invasion process by using reservoir numerical simulation technology [31][32][33][34]. Figure 8 shows the diagram of the mud invasion occurrence model.…”

Section: Analyzing External Factorsmentioning

confidence: 99%

“…The radial distribution of water saturation and salinity under different invasion conditions was obtained by simulation, and then, the dynamic change in the formation resistivity around the wellbore was obtained by Archie equation [35] assuming two-phase formation fluids, i.e., gas-water. The fluid seepage process followed the mass balance equation, and the mixture of drilling fluid and the original formation water followed the convection-diffusion equation [34]. According to the actual physical properties, fluid characteristics, Archie's equation parameters, and dynamic test data of the target area, the basic parameters of the numerical simulation model were selected as shown in Table 2.…”

Section: Analyzing External Factorsmentioning

confidence: 99%

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Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Jiang

Jian

et al. 2021

Geofluids

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Complex characteristics exist in the resistivity response of Gs reservoirs in the central inversion belt of the Xihu Sag, East China Sea Basin. Some drilling wells have confirmed the existence of abnormally low resistivity in gas reservoirs of the area; and the electrical logging response was unable to reflect fluid properties of the reservoir accurately. Therefore, it is necessary to analyze the origin of the low resistivity and determine its controlling factors. Based on experimental data of core analysis and numerical simulations of mud invasion, this study thoroughly explores the origin of low resistivity in the subject gas-bearing reservoir considering both internal and external factors. The results indicated that when there is no or a low degree of mud invasion, the fine lithology, complex pore structure, additional clay mineral conductivity, and high content of pyrite are the main internal factors driving the conditions present in the studied gas reservoir. When mud invasion occurs, the invasion of highly saline mud is the main external cause of low resistivity. The numerical simulation results indicated that a formation with good permeability and high overbalance pressure has a deep invasion depth. The resistivity around the well is obviously reduced after the invasion, and low resistivity would form easily. Combined with actual data of several wells, the main influencing factors of the reservoir’s electrical characteristics were analyzed, and the main controlling factors of low resistivity in the gas reservoirs are given. This study provides valuable support for studying the low-contrast complex reservoir conductivity mechanism. The study also offers novel ideas for accurate calculation of saturation and the meticulous evaluation of reservoir for subsequent studies.

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Section: Analyzing External Factorsmentioning

confidence: 99%

Section: Analyzing External Factorsmentioning

confidence: 99%

Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Jiang

Jian

et al. 2021

Geofluids

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“…1 Diagram of a borehole with a telemetry system (modified after Ribeiro and Carrasquilla 2014). (Jiang et al 2017;Anderson 2001) The medium is characterized by a "radial conductivity" rr which is constant in the horizontal directions and varies in the vertical direction for "vertical conductivity" zz , such that rr ≠ zz . The values of the subsurface conductivity tensor used in this study were defined using the anisotropy factor λ , longitudinal conductivity h , transverse conductivity t and dip angle θ.…”

Section: D Anisotropymentioning

confidence: 99%

EMT simulation and effect of TTI anisotropic media in EMT signal

Fayemi

Zhen

et al. 2021

Pet. Sci.

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An axisymmetric finite difference method is employed for the simulations of electromagnetic telemetry in the homogeneous and layered underground formation. In this method, we defined the anisotropy property using extensive 2D conductivity tensor and solved it in the transverse magnetic mode. Significant simplification arises in the decoupling of the anisotropic parameter. The developed method is cost-efficient, more straightforward in modeling anisotropic media, and easy to be implemented. In addition, we solved the integral operation in the estimation of measured surface voltage using Gaussian quadrature technique. We performed a series of numerical modeling of EM telemetry signals in both isotropic and anisotropic models. Experiment with 2D tilt transverse isotropic media characterized by the tilt axis and anisotropy parameters shows an increase in the EMT signal with an increase in the angle of tilt of the principal axis for a moderate coefficient of anisotropy. We show that the effect of the tilt of the subsurface medium can be observed with sufficient accuracy and that it is an order of magnitude of 5 over the tilt of 90 degrees. Lastly, consistent results with existing field data were obtained by employing the Gaussian quadrature rule for the computation of surface measured signal.

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Analysis and comparison of azimuthal resistivity measurement modes for laterolog tool

Gao

Rao

2019

Journal of Petroleum Science and Engineering

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Mud invasion and array laterolog responses in horizontal well based on numerical simulation

Cited by 5 publications

References 8 publications

Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

Analyzing the Origin of Low Resistivity in Gas-Bearing Tight Sandstone Reservoir

EMT simulation and effect of TTI anisotropic media in EMT signal

Analysis and comparison of azimuthal resistivity measurement modes for laterolog tool

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