Dynamic Modeling of Wellbore Pressures Allows Successful Drilling of a Narrow Margin HPHT Exploration Well in Malaysia

Nordin, Noor Azree; Umar, Lawrence; Aziz, Intan Azian Bt A; Nas, Steve; Woo, Wing Keat

doi:10.2118/155580-ms

Cited by 7 publications

(1 citation statement)

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“…Therefore, several technical works were carried out to obtain a more realistic picture of the well design in preparation for the KT simulations. A better and more complete picture of the boundaries required for well planning was achieved by using advanced multiphase KT models [4].…”

Section: Introductionmentioning

confidence: 99%

Realistic Simulation of Multiphase Kick Tolerance Model Promotes Safer Well Control Operations: Case Study

Elsayed

Azab

Abdellatief³

et al. 2022

Arab J Sci Eng

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Nowadays, deep-water drilling is of great importance for the development of oil and gas production. It is necessary to determine the maximum pressure that the formation can withstand during well control operation. This value can be calculated using several variables, including kick tolerance. The purpose of this study is to analyze a real well control event using dynamic well control modeling software that calculates the kick tolerance based on the single-phase and multiphase dispersed kick (gas) model. The initial results show that the type of drilling fluid plays an important role in the calculation of the kick tolerance. The calculated kick tolerance using a single-phase model indicates an allowable kick volume of 56 barrels (bbls), but in reality, we had a dispersed gas kick in a synthetic oil-based mud (SOBM) drilling fluid, which requires special kick tolerance calculations based on a multiphase dynamic model. After reviewing the results of the multiphase kick tolerance simulation, it was found that the maximum gas kick volume is more than twice that of using a single-phase model in an oil-based mud drilling fluid, allowing safe well control operations and reducing the possibility of accidents.

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Section: Introductionmentioning

confidence: 99%

Realistic Simulation of Multiphase Kick Tolerance Model Promotes Safer Well Control Operations: Case Study

Elsayed

Azab

Abdellatief³

et al. 2022

Arab J Sci Eng

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Dynamic Modelling for Well Design, Increasing Operational Margins in Challenging Fields

Vielma

Mosti

2014

Day 4 Thu, November 13, 2014

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The easy oil is gone and current field developments requires different approaches to produce oil and gas reserves in the most effective and economic ways, keeping the safety standards as high as technologically possible. The use of dynamic hydraulic modelling software to predict and establish wellbore pressures and temperature in challenging wells (e.g.: narrow margin window, HPHT or mature/depleted reservoirs), enable Drilling Engineers (DE) to make the well design within the operational limits for drilling, tripping, casing and cementing operations, thus allowing access to reserves. However, this process must start with a management of change in the philosophy that still is being applied today in planning and operational procedures (steady state modelling). This process starts with an in-depth review of the expected pore/fracture pressures, wellbore stability window and temperature profile along the well trajectory. The prediction of the operational window for each of the well sections will then be used to review the optimal mud weight including the dynamic ECD/ESD management and dynamic kick tolerance limitation for the proposed fluid, considering the operational transient effects on the well design. Subsequently, dynamic surge and swab and cementing calculations are included in the review to ensure that pore and fracture pressure limits are maintained during all operations. Bottomhole temperatures as well as surface temperatures can then be reviewed and predicted to ensure that downhole tools and other components can be used according to tool specifications. A combination of drilling techniques combined with real time pore pressure predictions, dynamic modelling and online drilling systems supported by the powerful computational technologies available nowadays, will change the way we plan and work our challenging fields in the near future. This paper will explore the fundamentals of the dynamic drilling modelling required during the well planning process, in addition to a brief description of "online drilling systems", to allow safe access to challenging fields.

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Overcoming High-Temperature Logging Challenges While Staying Cost-Effective for a Tight Gas Project in the Sultanate of Oman

Briner¹,

Ketabchi

Nadezhdin

2015

Day 2 Tue, September 15, 2015

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Data collection throughout the exploration stage is of paramount importance, especially for the unconventional projects. Since a vast amount of data is acquired through the well logging, large logging expenditures are usually incurred. In unconventional projects, marginal economics dictate particularly strict budget strategies, including expenditures for logging activities. A significant component of the logging costs is associated with the tool temperature rating. In northern Oman, the bottomhole static temperatures of the tight sandstone gas formation being explored are 175°C [347°F] or higher, which coincides with the upper limit of the conventional logging tools. It has been observed that the tool failure frequency increases dramatically when this limit is approached, leading to repeated logging jobs or regretted (missed) data. The simple way to increase the temperature rating of logging tools to perform at high bottomhole temperatures is to use ceramic electronic boards. However, the cost of this solution is roughly 10 times higher than standard tools. Slightly less costly is acquiring data with logging-while- drilling techniques; this has its own disadvantages, such as logging tool availability and data resolution. Another possible approach is careful assessment of the bottomhole temperature at particular times during logging to enable using conventional tools with lower temperature ratings. The assessment is a challenge itself. Direct measurements are difficult because the temperature gauges on logging tools are affected by heat from the electronic components. It is possible to simulate borehole conditions, but this requires extensive modeling and involves many variables such as cooling from mud circulation; heat transfer among the formation, annulus, and drillpipe; conversion of mechanical energy from drilling to heat; and the addition of hot cuttings to mud. That latter modeling has been performed and verified with the field data in various conditions: vertical and horizontal geometries and different mud types. The study established the achievable bottomhole circulating temperatures at various operations, duration of safe temperature window for less-expensive logging, and the bottomhole temperature profile in various drilling scenarios. This allowed delineating a road map for logging future high-temperature wells in the field.

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Dynamic Modeling of Wellbore Pressures Allows Successful Drilling of a Narrow Margin HPHT Exploration Well in Malaysia

Cited by 7 publications

References 0 publications

Realistic Simulation of Multiphase Kick Tolerance Model Promotes Safer Well Control Operations: Case Study

Realistic Simulation of Multiphase Kick Tolerance Model Promotes Safer Well Control Operations: Case Study

Dynamic Modelling for Well Design, Increasing Operational Margins in Challenging Fields

Overcoming High-Temperature Logging Challenges While Staying Cost-Effective for a Tight Gas Project in the Sultanate of Oman

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