Abstract
Most marine hydrates deposit in low permeable argillaceous sediments. However, the gas production rate of current field trials for hydrate reservoir is lower than the commercial criterion. To enhance gas production, a novel multilateral horizontal well was numerically investigated based on an unconfined hydrate reservoir in the Shenhu Area in the South China Sea. The investigation shows the novel deployment enhances gas production rate due to the enlarged dissociation region and a great quantity of stimulated hydrates. The release rate of gas from hydrate exceeds the production rate, 70% of produced gas is gaseous methane and water-to-gas ratio is favorable. For various factors, increasing the length and the number of lateral well significantly enhances the gas and water production rates, which raises about 30% with additional 100 m lateral well. The lateral well deployed in the middle of reservoir causes a high gas rate and low water rate, and the angle of the main and lateral wellbores (ANGMW&LW) slightly affects the gas production. The sequence of factor of the deployment on gas production herein is: well length, depth, spacing, ANGMW&LW. The commercial gas rate could be achieved with 22 groups of 1000 m length multilateral well.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.