Sourceless Porosity and Permeability Estimation with NMR Logs While Drilling in a Carbonate Reservoir: A Case Study

Serry, Amr Mohamed; Al-Mutwali, Omar; Al‐Mansoori, Abdulla; Al-Marzouki, M. I.; Budebes, Sultan; Gueddoud, A. G.; Balliet, Ron; Aki, Ahmet; Akopyan, G. A.

doi:10.2118/164203-ms

Cited by 8 publications

(1 citation statement)

References 4 publications

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“…In the literature, both T 1 and T 2 have been used to calculate NMR properties. In the following equation, T 1 has been used in the Kenyon model for the goal of permeability measurements:

K = C {normalφ}_{normalT}^{normala} {normalT}_{1 lm}^{normalb}

…”

Section: Introductionmentioning

confidence: 99%

Application of nuclear magnetic resonance permeability models in tight reservoirs

Solatpour

Kantzas

2019

Can J Chem Eng

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Tight reservoir permeability with values ranging from a few nD-0.1 mD is a challenging parameter to measure. Since the 1970s, many correlations were applied to estimate the permeability of tight formations using the nuclear magnetic resonance (NMR) technique. Due to increasing interest in tight reservoir recovery, each year many papers are published on the Timur-Coates and Kenyon models and their modification on estimating the NMR permeability of tight reservoirs. It brings up the question of which is the most accurate, reliable, and feasible model to be used for predicting tight NMR permeability.The first part of this paper is dedicated to introducing the existing models for NMR-based estimates of tight reservoir permeability. The second part compares these models by applying them on tight reservoirs from North America, Asia, and Europe. NMR experiments were conducted on 150 cores. NMR T 2 relaxation times were measured and effective and total porosities, the geometric mean of relaxation time (T 2gm ), irreducible bulk volume (BVI), and free fluid index (FFI) were calculated. For validation of the models, the cross plots of NMR permeability versus the Klinkenberg gas permeability are presented. Comparison of the model is based on the calculated standard error of these two independently measured permeabilities.This paper is beneficial in understanding existing tight reservoir NMR permeability models. The results can be used as a guide for choosing the best NMR permeability estimation model for tight reservoirs data.

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“…In the literature, both T 1 and T 2 have been used to calculate NMR properties. In the following equation, T 1 has been used in the Kenyon model for the goal of permeability measurements:

K = C {normalφ}_{normalT}^{normala} {normalT}_{1 lm}^{normalb}

…”

Section: Introductionmentioning

confidence: 99%

Application of nuclear magnetic resonance permeability models in tight reservoirs

Solatpour

Kantzas

2019

Can J Chem Eng

View full text Add to dashboard Cite

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Sourceless Porosity and Anisotropy While Drilling Using Nuclear Magnetic Resonance and Azimuthal Acoustic LWD Tools Drilling Technology: A Case History

Azim

Turky

Thakuria

et al. 2015

Day 1 Mon, September 14, 2015

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A combination of nuclear magnetic resonance (NMR) and azimuthal acoustic tools was recently run in a logging-while-drilling (LWD) tool combination. This tool combination was used for the first time in Kuwait as a part of the bottomhole assembly (BHA), in addition to conventional tools, to acquire porosity without using radioactive sources. A deviated 8.5-in. borehole section of a well was planned through sand-shale sequences with a borehole inclination ranging from 0 to 90°. This geological section is typically crucial from a borehole stability point of view. Borehole deterioration and significant variations in pore pressure can create a high risk of becoming stuck-in-hole. The use of conventional porosity tools in a LWD BHA with installed radioactive sources would significantly elevate the risks to an environmental-hazard level. And, even retrievable based sources become problematic for successful extraction in high angle wells. LWD NMR and azimuthal acoustic tools, free of radioactive sources, were run for the first time in a LWD tool combination, with the primary objective to measure porosity, pressure prediction, and possible anisotropy using a centralized four-axis acoustic caliper. Previous experiences in the same geological setting encountered borehole enlargements by approximately 5 in. after only 15 to 16 hours. LWD helped bypass this issue and acquire high-quality data before borehole enlargement occurred. Additionally, indications of the presence of possible rock anisotropy were observed. The results were then correlated and matched to offset well data as well as with existing field geomechanics knowledge. This paper presents the planning, design, and execution of using LWD NMR and azimuthal acoustic tools in this well. It also discusses the viability, integrity, and robustness of logged data as well as interpreted results. Optimization of real-time drilling operations and petrophysical data acquisition requirements are also investigated to improve future field development and overall reservoir management strategies.

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Sourceless Formation Evaluation and Geomechanics While Drilling: A Case History

et al. 2015

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A combination of nuclear magnetic-resonance (NMR) and azimuthal acoustic tools has recently become an optional sourceless porosity logging-while-drilling (LWD) tool. This tool combination was used in Kuwait as a part of the bottomhole assembly (BHA) only once before, but this time, we were able to draw a comparison with density-neutron logs taken from the same well as it was run in wipe mode for a specific interval. A deviated 8.5-in. pilot hole was planned through sand-shale sequences in a geological section which is deemed to be critical from a borehole-stability point of view. Borehole deterioration and significant variations in pore pressure can increase the risk for the drillstring to become stuck in hole. The use of conventional porosity tools in an LWD BHA with radioactive sources would elevate the risks to an environmental-hazard level. In addition, retrievable-based sources can also be problematic during extraction in high-angle wells. LWD NMR and azimuthal acoustic tools, free of radioactive sources, were run in an LWD tool combination, with the primary objective to measure porosity, pressure prediction, and possible anisotropy using a centralized four-axis acoustic caliper. Previous experiences in the same geological setting encountered borehole enlargements by approximately 5 in. after only 15 to 16 hours. LWD helped bypass this issue and acquire high-quality data before borehole enlargement occurred. Additionally, indications of the presence of possible rock anisotropy were observed. The results were then correlated and matched to offset well data as well as with existing field geomechanics knowledge. This paper presents the planning, design, and execution of using LWD NMR and azimuthal acoustic tools in this well. It also discusses the viability, integrity, and robustness of logged data as well as interpreted results. Optimization of real-time drilling operations and petrophysical data-acquisition requirements are also investigated to improve future field development and overall reservoir-management strategies.

show abstract

Sourceless Porosity and Permeability Estimation with NMR Logs While Drilling in a Carbonate Reservoir: A Case Study

Cited by 8 publications

References 4 publications

Application of nuclear magnetic resonance permeability models in tight reservoirs

Application of nuclear magnetic resonance permeability models in tight reservoirs

Sourceless Porosity and Anisotropy While Drilling Using Nuclear Magnetic Resonance and Azimuthal Acoustic LWD Tools Drilling Technology: A Case History

Sourceless Formation Evaluation and Geomechanics While Drilling: A Case History

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