Date: Tuesday, 22nd of Oct 2019
Oscar Becerra Moreno & Kousha Gohari
@ Baker Hughes
Location: Calgary Petroleum Club
Time: 11:30 AM - 1:00 PM
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Steam Assisted Gravity Drainage (SAGD) is a complex process and requires more control relative to conventional applications during production operations. Over a decade ago the first Flow Control Device (FCD) completions were installed in SAGD wells in Canada with the intention of improving the steam chamber conformance and reducing the steam-oil ratio. The first installations were Liner Deployed (LD) FCDs. Based on the success of LD FCDs, operators progressed to retrofitting Tubing Deployed (TD) FCDs in underperforming SAGD producers, primarily completed with slotted liners. While majority of the wells retrofitted with TD FCDs show better performance, well failures have been reported and in some cases performance of wells with TD FCDs was below expectations.
An extensive study has been conducted to evaluate TD FCD installations in a number of SAGD projects in Western Canada in order to ascertain their performance. Due considerations were given to key factors such as geology, runtime, operational practices and the possibility of failure of the slotted liner. The production analysis compared the production profiles of the various FCD wells, pre-FCD installation and post-FCD installation, as well as to the non-FCD analogue wells. Production strategy implemented for each well was taken into account to eliminate variances.
The key parameters of FCD design, the restriction rating and the length per compartment, have been analyzed. The results indicate that constant restriction rating and close to uniform compartment length is a better strategy considering the fact that in SAGD the mobility along the wellbore (which is temperature dependent) may change over time along with the uncertainty associated with the data. The uncertainty on the initial production in flux profile makes the restriction setting selection complicated and higher than expected production imbalance along the lateral is the most probable cause of higher than expected total pressure drop what in some cases causes the well failure.
The study shows TD FCD retrofit can successful. However, special considerations are needed when designing TD FCD installations for SAGD producers compared to LD FCDs. The novelty of the study is the systematic approach to the analysis of TD FCDs in SAGD wells based and their comparison with LD FCDs based on field data.
Oscar Becerra Moreno holds mechanical engineering diploma from University of Carabobo, oil and gas specialist diploma from University de Oriente and Master of Science degree in mechanical engineering from University Simon Bolivar (Venezuela). Oscar began his oil and gas career with the Venezuelan National Oil Company (PDVSA) in 1992 as a production engineer and an artificial lift researcher. Since then he has held positions in Petrobras Energia as senior production engineer in Venezuela and Argentina and PetroChina Canada as a senior production engineer. He has also worked with service companies supporting lower completions, intelligent completions and artificial lift in Latin America, the Middle East and Canada. Currently, Oscar is the Reservoir Optimization Manager for Lower Completions - Global at Baker Hughes.
Kousha Gohari is currently a Technical Advisor at Baker Hughes Canada. After obtaining a petroleum engineering degree from the Texas Tech University, Kousha joined Baker Hughes and has held a wide range of positions in completions, reservoir and production engineering. Kousha has extensive experience working in the Gulf of Mexico, the North Sea and the Middle East. He has expertise in flow control devices and completion optimization for reservoir management. Kousha holds a number of patents and is an author of numerous technical papers. Currently, Kousha is serving on the Committee of the SPE Thermal Well Integrity and Design Symposium 2019.
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October 22, 2019
From 11:30 AM to 1:00 PM
||Calgary Petroleum Club|