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3 03, 2020

Special Considerations for Well Tubular Design at Elevated Temperatures

Abstract Understanding of material properties for tubular design under HPHT conditions goes well beyond the basics of the classic methods routinely employed in the industry. The objective of this paper is to highlight several important characteristics of the stress-strain response of high strength tubular materials which differ at elevated temperatures relative to room temperature, and to demonstrate the significant impact these differences can have on the pipe body strength and connection mechanical/sealability performance under HPHT conditions. Coupon test results of high strength tubulars commonly used in HPHT wells are presented to demonstrate the key differences in the stress-strain response [...]

30 09, 2019

Laboratory and Field Testing of a Steam-limiting Flow Control Device Developed for Thermal Applications

Abstract A review of laboratory and field testing of a new flow control device is presented in this paper. The device is designed specifically to limit steam breakthrough in thermal operations. For the past few years, four companies operating Steam Assisted Gravity Drainage (SAGD) facilities in Alberta's oil sands have come together to study downhole Flow Control Devices (FCDs) in a laboratory setting and to share field data of the application of such devices. Within this collaboration, a new device was designed to address the challenge specific to thermal operations, namely limiting steam breakthrough into production wells. Laboratory tests [...]

30 09, 2019

Risk-ranking Approach for Thermal Well Integrity Using Readily Available Application, Well and Operational Parameters

Abstract Well Integrity engineers are commonly challenged with using limited resources, and even more limited data, when trying to identify which wells amongst their diverse well inventory may be prone to damage and failure, the mechanisms and influential factors responsible for the potential damage and failures, and the reason why certain wells may pose the greatest risk. Furthermore, these integrity engineers are often uncertain as to the parameters that should be tracked; what inspection methods should be conducted, in which wells and at what frequency measures should be taken; and how the asset risks can be adequately determined and [...]

30 09, 2019

Verification of Autonomous Inflow Control Valve Flow Performance Within Heavy Oil-SAGD Thermal Flow Loop

Abstract One of the main challenges in Steam Assisted Gravity Drainage (SAGD) wells is steam breakthrough in producer wells, which can result in inefficient bitumen recovery due to high Steam Oil Ratio (SOR). Flow Control Devices (FCDs), also known as Inflow Control Devices (ICDs), have been developed for several years to balance the oil inflow along the horizontal wells and consequently delay or mitigate the unwanted fluid breakthrough. The newest generation of FCDs is a truly Autonomous Inflow Control Valve (AICV) which can optimize oil production, reduce SOR and significantly restrict the inflow of unwanted fluids such as water, [...]

30 09, 2019

Characterization of Flow Control Device Performance with Distributed Fiber-optic Sensors

Abstract It is becoming common to install inflow control devices (ICDs) along steam-assisted gravity drainage (SAGD) production liners to enhance temperature conformance and accelerate depletion. Additionally, some operators advocate the installation of similar outflow control devices (OCDs) along the injection well of the SAGD well pair. Collectively, these inflow and outflow devices are often referred to as FCDs. Industry adoption of flow control devices (FCDs) has increased, and several devices are commercially available for use in SAGD. In an effort to optimize FCD design and selection, a joint industry partnership (JIP) was formed (Vachon et al. 2015) and flow [...]

22 09, 2019

Use of Different Time Periods in MTTF Estimation – Discussion on the Need for Improved Guidance in Reliability Standards

Abstract Within reliability engineering, different time periods are being used to determine time-related reliability parameters. For example, when determining the mean (expected) time to failure (MTTF) of downhole pumps, typically the operating times or running times are used. But, in some cases, also periods where the pump is available (in an up state), and idle for whatever reason (e.g. surface facilities are down), could be included. ISO 14224:2016 and IEC 60050-192:2015 are key documents guiding reliability data collection and analysis in the petroleum, petrochemical and natural gas industries. However, not much guidance is provided in these documents on what [...]

26 05, 2019

A Bayesian Network for Slope Geohazard Management of Buried Energy Pipelines

Abstract Geohazards are the ground movement events that impose displacement demands on buried pipelines leading to excessive inelastic strains and possible loss of containment. Lack of data, as well as large uncertainties in the prediction of ground movement and inelastic pipe response are common challenges in geohazard management. A simple Bayesian network is presented in this study to demonstrate the integration of data from multiple sources, as well as prediction of the pipeline condition under a hypothetical ground movement scenario. The methodology used to obtain the network parameters and the challenges associated with the implementation are discussed. Author: Koduru, [...]

13 05, 2019

Assessment of ESP No-flow Events in SAGD Production Wells

Abstract This paper summarizes the work of the exploratory phase of a Joint Industry Project (JIP) investigating operational instabilities and ‘no flow’ events observed in a large number of Steam Assisted Gravity Drainage (SAGD) wells produced with ESPs; where, while the ESP is operating, flow to surface suddenly stops. The impact of these events to the SAGD operations has included lost production due to downtime and reduced drawdown, additional stresses to the ESP due to operating without flow for extended periods and repeated shutdowns and restarts and some system failures. The primary objectives of this exploratory phase were to [...]

6 05, 2019

Optimize Safety and Profitability by use of the ISO 14224 Standard and Big Data Analytics

Abstract This paper shows how the ISO 14224 standard, enterprise resource planning (ERP) software, and Big Data Analytics can be used to optimize safety and profitability in oil and gas, renewable energy, and in other asset-intensive industries. It also presents a logical approach for prioritizing application of digital capabilities for assets (e.g. equipment, systems and installations). ISO 14224 promulgates a standard data structure for collection and exchange of reliability and maintenance data for equipment. This data structure also can be used effectively to document failure scenarios for operating facilities. When equipment reliability and maintenance (RM) data and failure scenarios [...]

18 02, 2019

Reliability-based Criteria for Corrosion Assessment

Abstract In the current era where pipeline safety is of paramount interest, optimization of corrosion mitigation for vintage pipelines has a significant effect on the industry’s management systems and related costs. To that end, reliability-based Limit State Design and assessment (LSD) corrosion criteria have been developed for onshore pipelines as part of a joint industry project. These criteria have the unique characteristic of being calibrated to meet specific reliability targets within a certain tolerance but having a deterministic format that does not require probabilistic calculations for application. The assessment criteria cover both burst and leak failure modes. Their formulations [...]

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