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Edmonton, Canada

Xie J.,C FER Technologies
Society of Petroleum Engineers - SPE Thermal Well Integrity and Design Symposium | Year: 2015

To recover heavy oil and bitumen from the highly unconsolidated reservoirs of the Western Canada oilsands fields using the horizontal well method, and in particular the thermal in situ method of Steam Assisted Gravity Drainage (SAGD), some forms of sand control, such as slotted liners and wire-wrapped screens (WWS), are generally required to limit sand production and maintain well productivity. Over the past two decades, a number experimental and analytical studies have been performed for developing industry guidelines and best practices for the structural and hydraulic design and evaluation of sand control liners under the challenging conditions of SAGD steam injection and production wells. The vast majority of SAGD applications, estimated at about 90% (RPS 2009), employ slotted liners as the sand control method. Design efforts to address the structural and serviceability requirements, however, often oppose one other, presenting significant challenges to the design of slotted liners. For example, in order to maintain sufficient torque, collapse and strain-absorbing capacities, traditional slotted liners are often designed to have low Open Flow Areas (OFA) around 1%, although a larger OFA is desired for production efficiency. This paper reviews current design requirements for SAGD wells, as well as puts forward a new slotted liner design consideration for the optimized performance under installation and operational loads. Using Finite Element Analysis (FEA) modeling, the effect of key design parameters, such as slot length and slot pattern, are studied. This paper focuses on the feasibility study of achieving higher OFA than the currently-used limit, while maintaining sufficient torque, collapse and strain-absorbing capacities under thermal well load conditions. Copyright 2015, Society of Petroleum Engineers. Source

Chen Q.,C FER Technologies
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2014

Structural analysis methods used in the design of buried pipelines for the discontinuous permafrost regions need to handle the unique conditions that can arise; in particular thaw subsidence and frost heave. As a chilled gas pipeline traverses from a frost stable soil zone to a frost susceptible zone, frost bulbs are formed around the pipe and cause the pipeline to heave. If there is significant differential heave, pipe bending across the interface between these two zones could result in pipe strains exceeding design limits, or in extreme cases, buckling or tensile fracture. For pipelines subjected to geotechnical hazards, characterization of strain demand is an integral part of the strain-based design process. This paper describes a simplified finite element model that was developed to predict compressive and tensile strain demand of gas pipelines subjected to frost heave. By using features that are typically available in general-purpose finite element analysis software, the proposed pipe-soil interaction model addressed issues that are essential for predicting pipeline strain demand. These issues include pressure-dependent heave displacement, and geometrically non-linear load-displacement response of steel pipe. The simplified model was validated by comparing model predictions to the Caen tests. Copyright © 2014 by the International Society of Offshore and Polar Engineers (ISOPE). Source

Skoczylas P.,C FER Technologies
Society of Petroleum Engineers - 2014 SPE Artificial Lift Conference - North America | Year: 2014

Drive string (rod string) fatigue failures may occur occasionally in Progressing Cavity Pump (PCP) applications. In a deviated well, the drive string is subjected to rotating bending while the pump is in operation. For each rotation of the string, each portion of the rod's surface undergoes a load cycle of compression and tension. This load cycle is overlaid on the approximately constant torque and axial load that are usually the primary loads considered in sizing a drive string. While the alternating load from rotating bending typically results in a small stress compared to the other loads, it can eventually lead to a fatigue failure. This paper presents a model for estimating the life of a drive string before a fatigue failure occurs. This model considers the overall stress state in the drive string, the effects of curvature magnification (which occurs near the larger diameter connections in a coupled drive string), and environmental factors. The model has been developed only for solid rod bodies (whether coupled or continuous), and it is not applicable to hollow rods. This paper also discusses several aspects of lab testing for determining fatigue life. Simple fatigue tests are typically performed under either pure rotating bending, or cyclic bending (without rotation). These tests may not give results that are representative of the actual fatigue life that may result from operation in a different stress state (i.e. when constant torsional and axial stresses are added to the cyclic bending stress). This paper is aimed at assisting production engineers in designing drive strings for applications in which fatigue failures may occur. Source

Koduru S.D.,C FER Technologies
12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP 2015 | Year: 2015

Practical applications for separation of aleatory and epistemic uncertainties are demonstrated with two examples applied to steel structures and pipelines. These examples show the need for separation of uncertainties, the application of existing strategies and their limitations. The first example pertains to the behaviour of a simple steel connection subjected to combined axial, shear and moment loading. Uncertainties in the material properties of the connection components are shown to have a significant influence on the model uncertainty corresponding to the connection moment capacity. The second example shows that the uncertainties in the geometric imperfections of a steel pipeline contribute to the total model uncertainty in the strain capacity of the pipe. More such case studies demonstrating the utility of separation of epistemic uncertainty are expected to lead to increased efficiency in future model development. Source

Alhanati F.,C FER Technologies
Society of Petroleum Engineers - Progressing Cavity Pumps Conference 2010 | Year: 2010

When performing statistical analyses on PCP run-life data, one can easily reach incorrect conclusions if subtle but important issues are not fully understood. This paper illustrates some of these issues using examples from analysis work conducted recently with a relatively large and complete set of data collected from several large operators. Issues examined include misinterpretation of single-variable correlation results and run-life measures. It is impractical to design and conduct lab or field experiments to investigate the effect of individual variables on PCP run-life. On the other hand, with normal field data, it can be difficult to isolate the effects of individual variables. The assumption of "all else being equal" rarely applies to field data. Additionally, different run-life measures can give different results at different times in the life of a field, even when the underlying system reliability has not changed. Awareness of these issues is essential to all companies that collect and analyze PCP failure and run-life information for the purpose of evaluating and improving PCP system performance. Copyright 2010, Society of Petroleum Engineers. Source

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