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5 02, 2019

Developing an Evaluation Method for Casing Connections used in Hydraulically Fractured Wells

Abstract Hydraulic fracturing as a means to stimulate production has become an effective way to extract oil and gas from low-porosity, low-permeability, hydrocarbon-bearing formations. The technology used in support of hydraulic fracturing is evolving at a fast rate, which has enabled operators worldwide to achieve improved recovery in increasingly complex well environments. The well designs and completion strategies associated with hydraulic fracturing come with a unique set of challenges. During well construction, the long lateral sections of extended-reach wells may require the production (or intermediate) casing to be rotated and pushed through build sections of relatively high curvature (greater [...]

1 11, 2018

Staged Risk-Based Approach for Assessing Erosion Resistance of SAGD Flow Control Devices

Abstract SAGD operators are actively installing Inflow Control Devices (ICDs) in their SAGD production wells to enable production at low or ˜negative" subcool values in order to maximize drawdown, increase fluid production rates and optimize SAGD economics. Operating the wells under higher vapour conditions could expose the ICDs to high velocity steam carrying sand particles, causing erosion and liner failure. A staged approach has been developed for assessing the relative erosion risk of candidate ICDs, including a stage one qualitative assessment, followed by analytical erosion calculations and Computational Fluid Dynamics (CFD) modeling. In the first stage qualitative assessment, factors [...]

15 10, 2018

High Temperature ESPs for Geothermal Production: The Ideal Pump

Abstract The need for a robust pumping system capable of operating in the challenging conditions presented in geothermal production wells has been identified as a critical piece of equipment for the advancement of geothermal energy utilization. In typical geothermal operations, establishing and maintaining a high production rate at high temperatures is critical to the economic viability of the project. Electrical Submersible Pumps (ESPs) have significant advantages over other commonly used pumping systems in geothermal operations, and have the potential to enhance the production of geothermal wells. ESP systems are currently available that are capable of handling high operating temperatures;however, [...]

24 09, 2018

Limit States Design Checks for Geotechnical Loads

Abstract A limit states design approach has been developed for geotechnical loads. The approach uses a strain based design format and requires the user to develop probability distributions for the maximum strain demand and minimum strain capacity. Checks are provided for both local buckling and tensile rupture, which are calibrated to meet specified risk-consistent reliability targets. The safety factor and the criteria used to define the characteristic strain demand and capacity are defined as functions of the reliability target and the coefficients of variation of the strain demand and capacity. The checks are calibrated for a wide range of [...]

1 07, 2016

Moving Beyond Rules of Thumb

The percentage of oil and gas fields being developed with high curvature and horizontal wellbores continues to increase throughout the industry, and the ability to effectively and economically produce these wells is becoming increasingly important. Horizontal and other directional wells are found in various applications, including unconventional oil, condensate and gas wells which are often developed using pad-drilled horizontal wells onshore, and platform-drilled directional wells offshore.  These wells are increasingly being produced with artificial lift technologies, particularly electric submersible pumps (ESPs). Because of the capital, servicing and downtime costs associated with ESP failures, high ESP reliability is often critical [...]

7 06, 2016

Evaluation of Horizontal Liner Installation Loads Using Advanced Numerical Simulation Technique

Abstract Horizontal wells have been widely used to significantly increase reservoir exposure in a wide range of conventional and unconventional oil and gas recovery applications, including tight-rock and multi-stage fracturing, offshore, primary and thermal heavy oil projects. In the heavy oil and bitumen reservoirs of the Western Canadian basin, horizontal wells have been extensively employed in Steam Assisted Gravity Drainage (SAGD) and Cyclic Steam Stimulation (CSS) in-situ recovery projects. In SAGD applications, the lateral sections of these horizontal wells are generally completed with various types of sand control systems, including slotted liners, Wire Wrapped Screens (WWS) and premium screens [...]

23 09, 2015

Sand Control Screen Cyclic Thermal Testing for Life of SAGD Wells

Abstract Wire Wrapped Screens (WWS) have received more attention from Steam assisted Gravity Drainage (SAGD) operators. A WWS is commonly fabricated with a wedge-shaped wire that is spiral-wound around a perforated base pipe to form a Wire wound Mesh (WWM). This produces a single, continuous, keystone-shaped helical slot with a large open flow area to enable for fluid flow while maintaining the structural rigidity of the base pipe and providing sand control to the wellbore. The structural integrity of a WWS with dual ring Wrap-On-Pipe (WOP) WWM and gap opening and closing within the WWM during thermally-induced loading were [...]

9 06, 2015

Use of Flow Control Devices (FCDs) to Enforce Conformance in Steam Assisted Gravity Drainage (SAGD) Completions

Abstract Flow Control Devices (FCDs) have demonstrated significant potential for improving recovery in Steam Assisted Gravity Drainage (SAGD) production wells. One initial hypothesis was that steam breakthrough was delayed because the FCDs better homogenized injection and production by equalizing flow and compensating for pressure changes along the wellbore. However, in many cases, the field results were far greater than such an approach would have justified. The actual physics for this process are unclear, and not demonstrated in literature. Upon review of field data published by ConocoPhillips, the possibility of a steam blocking effect was proposed (Stalder, 2012), although the [...]

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