Khalil Rahman - Academia.edu (original) (raw)
Papers by Khalil Rahman
Systematic geomechanical evaluation for short-term gas storage in depleted reservoirs
The APPEA Journal, 2012
Depleted hydrocarbon reservoirs are attractive targets for short-term gas storage with frequent i... more Depleted hydrocarbon reservoirs are attractive targets for short-term gas storage with frequent injection and production cycles. Optimum well completion and injection-storage-production design in depleted reservoirs would require an understanding of important rock mechanical issues. These include drilling and completion challenges of new wells in low-pressure reservoirs accounting for potential rock fatigue due to cyclic injection/depletion and loading and unloading, and determination of maximum sustainable storage pressures that would avoid fracturing and fault reactivation. This paper describes a case study from a coal seam gas project considered for supply to a liquefied natural gas plant in Australia. The paper demonstrates a systematic approach for geomechanical risk assessments for short-term gas storage in depleted sandstone reservoirs. Depleted sandstone gas reservoirs at a depth of 1,000 m with existing pressures of 150–300 psi are considered in this study. Historical and n...
SPE Asia Pacific Oil and Gas Conference and Exhibition
In many cases, the production prediction at the fracture design stage and later from the post-fra... more In many cases, the production prediction at the fracture design stage and later from the post-fracture pressure-matching exercise is never realized. The underperformance of fracture treatments is often attributed either to formation damage, proppant crushing and embedment, or to the poor reservoir quality despite a reasonably good reservoir property indicator from all sources including the pressure decline in a mini-fracture test. Based on several case studies, this paper highlights a number of issues that were found responsible for underperformance of fracture treatments. The understanding and mitigation of these issues require the application of comprehensive geomechanics. For each case, a comprehensive geomechanical model was built for the field, characterizing the depth profiles of all three stresses, rock mechanical properties and the direction of the horizontal stresses by integrating available data from various sources including drilling and logging data, laboratory rock test...
Sand production assessment considering the reservoir geomechanics and water breakthrough
The APPEA Journal
Sand production assessment is essential from the early stages of field development planning for c... more Sand production assessment is essential from the early stages of field development planning for completion design and later for the production optimisation. Unconsolidated and weakly consolidated sandstones are prone to fail at a low flowing bottomhole pressure during hydrocarbon production. To predict the critical flowing bottomhole pressure or a safe drawdown, a geomechanical model that integrates in situ stresses, rock mechanical properties, the well trajectory, reservoir pressure, the production plan and the depletion trend is required. For a given stress field, well trajectory and production plan, the rock strength index is a key parameter that has significant impacts on the sanding risk. This paper presents the results of a study investigating the potential of sand production from primary and secondary target reservoir rocks in a petroleum field in offshore Vietnam. A poroelastic analytical approach was used to investigate if sands will be produced from the open holes or perfo...
A geomechanical approach for sanding risk assessment applied to three field cases for completion optimisation
The APPEA Journal
Mitigation of sand production is increasingly becoming an important and challenging issue in the ... more Mitigation of sand production is increasingly becoming an important and challenging issue in the petroleum industry. This is because the increasing demand for oil and gas resources is forcing the industry to expand its production operations in more challenging unconsolidated reservoir rocks and depleted sandstones with more complex well completion architecture. A sand production prediction study is now often an integral part of an overall field development planning study to see if and when sand production will be an issue over the life of the field. The appropriate type of sand control measures and a cost-effective sand management strategy are adopted for the field depending on timing and the severity of predicted sand production. This paper presents a geomechanical modelling approach that integrates production or flow tests history with information from drilling data, well logs and rock mechanics tests. The approach has been applied to three fields in the Australasia region, all wi...
Geomechanical Sweet Spot Identification in Unconventional Resources Development
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
High Stress Contrast between Different Lithologies and its Implications for Drilling and Stimulation in the Northern Cooper Basin
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
Well Planning and Stimulation Optimisation by Integrating 3D Geomechanics for a Horizontal Well in the Northern Cooper Basin
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
Optimization of Horizontal Well Spacing and Transverse Fracture Stages for a Thinly Interbedded Tight Sand Reservoir Onshore Australia
SPE Asia Pacific Unconventional Resources Conference and Exhibition, 2015
An Intelligent Hydraulic Fracture Optimization Model: A New Tool to Stimulate Low Permeable Oil Reservoir
Geomechanical Assessment Aids Successful Coiled Tubing Drilling (CTD) of Horizontal Wells Through Depleted Reservoirs Interbedded With Weak Formations in the D18 Field
SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, 2015
Effective and Sustainable Hydraulic Fracturing, 2013
A comprehensive geomechanical study was carried out to optimize stimulation for a fractured tight... more A comprehensive geomechanical study was carried out to optimize stimulation for a fractured tight gas reservoir in the northwest Tarim Basin. Conventional gel fracturing and acidizing operations carried out in the field previously failed to yield the expected productivity. The objective of this study was to assess the effectiveness of slickwater or low-viscosity stimulation of natural fractures by shear slippage, creating a conductive, complex fracture network. This type of stimulation is proven to successfully exploit shale gas resources in many fields in the United States. © 2013 Gui et al.; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Geomechanical and Reservoir Integrated Hydraulic Fracturing Optimisation for a Tight Oil Reservoir: A Case Study From Offshore Vietnam
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Producing tight oil reservoirs by hydraulic fracturing is especially challenging due to relativel... more Producing tight oil reservoirs by hydraulic fracturing is especially challenging due to relatively low oil mobility. At the planning stage, an integrated approach is essential to optimise fracture parameters using a reliable geomechanical model and reliable reservoir simulations to predict the post-fracture productivity and the net present value (NPV). This paper presents such an integrated case study. The reservoir contained relatively clean sandstones interlaying only a few thin shale layers. A relatively low recovery was expected to yield a good positive NPV because production was planned using a nearby existing production facility. A geomechanical model was built using core, well log and drilling data characterizing the in situ stress, pore pressure and rock mechanical properties in the field. The reservoir properties were characterized from core-log calibration and PVT data from analogue reservoirs. The initial reservoir pressure was very close to the bubble point pressure. Thu...
Reservoir Simulation With Hydraulic Fractures: Does it Really Matter How We Model Fractures?
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Enhanced Rock Strength Modelling, Combining Triaxial Compressive Tests, Non-Destructive Index Testing and Well Logs
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Knowledge of rock mechanical properties, including unconfined compressive strength (UCS), is esse... more Knowledge of rock mechanical properties, including unconfined compressive strength (UCS), is essential for accurate geomechanical evaluations. Reliable quantitative data on UCS can only be derived at specific depths from laboratory tests on core samples, typically through destructive tests. Rock strength evaluation is primarily based on well log strength indicators, calibrated where possible against limited measurements on cores. A number of techniques have been developed to supplement plug-based destructive tests to indicate the rock's strength. Scratch and Schmidt hammer tests are examples of such techniques with the ability to provide continuous or semi-continuous, fine-scale measurements of rock mechanical properties. Both of these index tests are non-destructive; do not cause significant damage to the core and no special core preparation is required prior testing. In this paper we examine laboratory test results from both conventional triaxial testing on plugs and semi-cont...
Rock Strength from Core and Logs, Where We Stand and Ways to Go
EUROPEC/EAGE Conference and Exhibition, 2009
Copyright 2009, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2009, Society of Petroleum Engineers This paper was prepared for presentation at the 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition held in Amsterdam, The Netherlands, 811 June 2009. This paper was selected for presentation by an SPE ...
Fracture Growth and Injectivity Issues for Produced Water Reinjection Wells - Case Studies with Fields from offshore Australia and UK North Sea
SPE Asia Pacific Oil and Gas Conference and Exhibition, 2012
ABSTRACT
Implications of Geomechanical Analysis on the Success of Hydraulic Fracturing: Lesson Learned from an Australian Coalbed Methane Gas Field
SPE Hydraulic Fracturing Technology Conference, 2007
Copyright 2007, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2007, Society of Petroleum Engineers This paper was prepared for presentation at the 2007 SPE Hydraulic Fracturing Technology Conference held in College Station, Texas, USA, 2931 January 2007. This paper was selected for presentation by an SPE Program ...
A Decision Support System for Cost-effective Assessment of Sand Production Risk and Selection of Completion Type
SPE Asia Pacific Oil and Gas Conference and Exhibition, 2010
ABSTRACT
Minimizing Sanding Risk by Optimizing Well and Perforation Trajectory Using an Integrated Geomechanical and Passive Sand-Control Approach
SPE Annual Technical Conference and Exhibition, 2008
Copyright 2008, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2008, Society of Petroleum Engineers This paper was prepared for presentation at the 2008 SPE Annual Technical Conference and Exhibition held in Denver, Colorado, USA, 2124 September 2008. This paper was selected for presentation by an SPE program ...
An Integrated Geomechanical and Passive Sand-Control Approach to Minimizing Sanding Risk From Openhole and Cased-and-Perforated Wells
SPE Drilling & Completion, 2010
Summary The source of sand production is the presence of disintegrated sand grains caused by rock... more Summary The source of sand production is the presence of disintegrated sand grains caused by rock failure at the wellbore and/or perforation walls. Decision for appropriate sand-control strategy requires engineering analysis to evaluate timing and severity of sanding over the ...
Systematic geomechanical evaluation for short-term gas storage in depleted reservoirs
The APPEA Journal, 2012
Depleted hydrocarbon reservoirs are attractive targets for short-term gas storage with frequent i... more Depleted hydrocarbon reservoirs are attractive targets for short-term gas storage with frequent injection and production cycles. Optimum well completion and injection-storage-production design in depleted reservoirs would require an understanding of important rock mechanical issues. These include drilling and completion challenges of new wells in low-pressure reservoirs accounting for potential rock fatigue due to cyclic injection/depletion and loading and unloading, and determination of maximum sustainable storage pressures that would avoid fracturing and fault reactivation. This paper describes a case study from a coal seam gas project considered for supply to a liquefied natural gas plant in Australia. The paper demonstrates a systematic approach for geomechanical risk assessments for short-term gas storage in depleted sandstone reservoirs. Depleted sandstone gas reservoirs at a depth of 1,000 m with existing pressures of 150–300 psi are considered in this study. Historical and n...
SPE Asia Pacific Oil and Gas Conference and Exhibition
In many cases, the production prediction at the fracture design stage and later from the post-fra... more In many cases, the production prediction at the fracture design stage and later from the post-fracture pressure-matching exercise is never realized. The underperformance of fracture treatments is often attributed either to formation damage, proppant crushing and embedment, or to the poor reservoir quality despite a reasonably good reservoir property indicator from all sources including the pressure decline in a mini-fracture test. Based on several case studies, this paper highlights a number of issues that were found responsible for underperformance of fracture treatments. The understanding and mitigation of these issues require the application of comprehensive geomechanics. For each case, a comprehensive geomechanical model was built for the field, characterizing the depth profiles of all three stresses, rock mechanical properties and the direction of the horizontal stresses by integrating available data from various sources including drilling and logging data, laboratory rock test...
Sand production assessment considering the reservoir geomechanics and water breakthrough
The APPEA Journal
Sand production assessment is essential from the early stages of field development planning for c... more Sand production assessment is essential from the early stages of field development planning for completion design and later for the production optimisation. Unconsolidated and weakly consolidated sandstones are prone to fail at a low flowing bottomhole pressure during hydrocarbon production. To predict the critical flowing bottomhole pressure or a safe drawdown, a geomechanical model that integrates in situ stresses, rock mechanical properties, the well trajectory, reservoir pressure, the production plan and the depletion trend is required. For a given stress field, well trajectory and production plan, the rock strength index is a key parameter that has significant impacts on the sanding risk. This paper presents the results of a study investigating the potential of sand production from primary and secondary target reservoir rocks in a petroleum field in offshore Vietnam. A poroelastic analytical approach was used to investigate if sands will be produced from the open holes or perfo...
A geomechanical approach for sanding risk assessment applied to three field cases for completion optimisation
The APPEA Journal
Mitigation of sand production is increasingly becoming an important and challenging issue in the ... more Mitigation of sand production is increasingly becoming an important and challenging issue in the petroleum industry. This is because the increasing demand for oil and gas resources is forcing the industry to expand its production operations in more challenging unconsolidated reservoir rocks and depleted sandstones with more complex well completion architecture. A sand production prediction study is now often an integral part of an overall field development planning study to see if and when sand production will be an issue over the life of the field. The appropriate type of sand control measures and a cost-effective sand management strategy are adopted for the field depending on timing and the severity of predicted sand production. This paper presents a geomechanical modelling approach that integrates production or flow tests history with information from drilling data, well logs and rock mechanics tests. The approach has been applied to three fields in the Australasia region, all wi...
Geomechanical Sweet Spot Identification in Unconventional Resources Development
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
High Stress Contrast between Different Lithologies and its Implications for Drilling and Stimulation in the Northern Cooper Basin
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
Well Planning and Stimulation Optimisation by Integrating 3D Geomechanics for a Horizontal Well in the Northern Cooper Basin
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2016
Optimization of Horizontal Well Spacing and Transverse Fracture Stages for a Thinly Interbedded Tight Sand Reservoir Onshore Australia
SPE Asia Pacific Unconventional Resources Conference and Exhibition, 2015
An Intelligent Hydraulic Fracture Optimization Model: A New Tool to Stimulate Low Permeable Oil Reservoir
Geomechanical Assessment Aids Successful Coiled Tubing Drilling (CTD) of Horizontal Wells Through Depleted Reservoirs Interbedded With Weak Formations in the D18 Field
SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, 2015
Effective and Sustainable Hydraulic Fracturing, 2013
A comprehensive geomechanical study was carried out to optimize stimulation for a fractured tight... more A comprehensive geomechanical study was carried out to optimize stimulation for a fractured tight gas reservoir in the northwest Tarim Basin. Conventional gel fracturing and acidizing operations carried out in the field previously failed to yield the expected productivity. The objective of this study was to assess the effectiveness of slickwater or low-viscosity stimulation of natural fractures by shear slippage, creating a conductive, complex fracture network. This type of stimulation is proven to successfully exploit shale gas resources in many fields in the United States. © 2013 Gui et al.; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Geomechanical and Reservoir Integrated Hydraulic Fracturing Optimisation for a Tight Oil Reservoir: A Case Study From Offshore Vietnam
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Producing tight oil reservoirs by hydraulic fracturing is especially challenging due to relativel... more Producing tight oil reservoirs by hydraulic fracturing is especially challenging due to relatively low oil mobility. At the planning stage, an integrated approach is essential to optimise fracture parameters using a reliable geomechanical model and reliable reservoir simulations to predict the post-fracture productivity and the net present value (NPV). This paper presents such an integrated case study. The reservoir contained relatively clean sandstones interlaying only a few thin shale layers. A relatively low recovery was expected to yield a good positive NPV because production was planned using a nearby existing production facility. A geomechanical model was built using core, well log and drilling data characterizing the in situ stress, pore pressure and rock mechanical properties in the field. The reservoir properties were characterized from core-log calibration and PVT data from analogue reservoirs. The initial reservoir pressure was very close to the bubble point pressure. Thu...
Reservoir Simulation With Hydraulic Fractures: Does it Really Matter How We Model Fractures?
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Enhanced Rock Strength Modelling, Combining Triaxial Compressive Tests, Non-Destructive Index Testing and Well Logs
SPE Asia Pacific Oil & Gas Conference and Exhibition, 2014
Knowledge of rock mechanical properties, including unconfined compressive strength (UCS), is esse... more Knowledge of rock mechanical properties, including unconfined compressive strength (UCS), is essential for accurate geomechanical evaluations. Reliable quantitative data on UCS can only be derived at specific depths from laboratory tests on core samples, typically through destructive tests. Rock strength evaluation is primarily based on well log strength indicators, calibrated where possible against limited measurements on cores. A number of techniques have been developed to supplement plug-based destructive tests to indicate the rock's strength. Scratch and Schmidt hammer tests are examples of such techniques with the ability to provide continuous or semi-continuous, fine-scale measurements of rock mechanical properties. Both of these index tests are non-destructive; do not cause significant damage to the core and no special core preparation is required prior testing. In this paper we examine laboratory test results from both conventional triaxial testing on plugs and semi-cont...
Rock Strength from Core and Logs, Where We Stand and Ways to Go
EUROPEC/EAGE Conference and Exhibition, 2009
Copyright 2009, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2009, Society of Petroleum Engineers This paper was prepared for presentation at the 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition held in Amsterdam, The Netherlands, 811 June 2009. This paper was selected for presentation by an SPE ...
Fracture Growth and Injectivity Issues for Produced Water Reinjection Wells - Case Studies with Fields from offshore Australia and UK North Sea
SPE Asia Pacific Oil and Gas Conference and Exhibition, 2012
ABSTRACT
Implications of Geomechanical Analysis on the Success of Hydraulic Fracturing: Lesson Learned from an Australian Coalbed Methane Gas Field
SPE Hydraulic Fracturing Technology Conference, 2007
Copyright 2007, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2007, Society of Petroleum Engineers This paper was prepared for presentation at the 2007 SPE Hydraulic Fracturing Technology Conference held in College Station, Texas, USA, 2931 January 2007. This paper was selected for presentation by an SPE Program ...
A Decision Support System for Cost-effective Assessment of Sand Production Risk and Selection of Completion Type
SPE Asia Pacific Oil and Gas Conference and Exhibition, 2010
ABSTRACT
Minimizing Sanding Risk by Optimizing Well and Perforation Trajectory Using an Integrated Geomechanical and Passive Sand-Control Approach
SPE Annual Technical Conference and Exhibition, 2008
Copyright 2008, Society of Petroleum Engineers This paper was prepared for presentation at the 20... more Copyright 2008, Society of Petroleum Engineers This paper was prepared for presentation at the 2008 SPE Annual Technical Conference and Exhibition held in Denver, Colorado, USA, 2124 September 2008. This paper was selected for presentation by an SPE program ...
An Integrated Geomechanical and Passive Sand-Control Approach to Minimizing Sanding Risk From Openhole and Cased-and-Perforated Wells
SPE Drilling & Completion, 2010
Summary The source of sand production is the presence of disintegrated sand grains caused by rock... more Summary The source of sand production is the presence of disintegrated sand grains caused by rock failure at the wellbore and/or perforation walls. Decision for appropriate sand-control strategy requires engineering analysis to evaluate timing and severity of sanding over the ...