Natural gas hydrates are enormous energy resources occurring in the permafrost and under deep ocean sediments. However, commercial or sustained production of this resource with currently available technology remains a technical, environmental, economic challenge, albeit few tests have been conducted to date. One major challenges has sand due unconsolidated nature hydrate bearing formations. This review presents progress methane from natural deposits, specifically addressing technology, field...

Abstract This study focuses on technical feasibility of producing natural gas from offshore hydrate deposits using a new technique called horizontal snake wells (HSW). paper addresses engineering and well productivity issues for the technique. Coiled tubing string is proposed to drill HSW in reservoirs increasing reducing wellbore collapse problems. A analytical model was derived predict maximum achievable length (MAWL) based theory buckling failure. Furui's equation used predicting initial...

An analytical model for predicting the productivity of Radial-lateral wells (RLW) drilled using radial jet drilling technology was developed in this work. The assumes uniformly distributed equal-geometry laterals draining oil or gas under pseudo-steady state flow conditions within lateral-reached drainage area. A numerical simulation and production data from three field cases RLW were used to compare validate model. result indicates that overestimates well rates by 7.7%, 3.25%, 8.8%,...

Summary Currently, researchers and the industry believe that water invasion into a shale matrix should dominate process of soaking before flowback hydraulic fracturing fluids. Based on laboratory observations with Tuscaloosa marine (TMS) cores, we postulate hypothesis cracks are formed in formations during after fracture stimulation they later contribute to improved well productivity. The formation contributes improving inflow performance, while also draw fluid from fractures, reduce width,...

Abstract Adequate well injectivity is required to successfully inject large volumes of CO2 through a minimum number wells. Brine vaporization in the wellbore vicinity has been identified as major impairment mechanism especially deep saline reservoirs. A bundle-of-tubes model was developed investigate basic mechanisms salt precipitation and quantify loss induced by precipitated salts during injection into formations. Berea sandstone rock reconstructed with model. correlation estimate solid...

The objective of this study is to develop a technique identify the optimum water-soaking time for maximizing productivity shale gas and oil wells. Based on lab observation cracks formed in core samples under simulated conditions, cracking was found dominate process multi-fractured gas/oil An analytical model derived from principle capillary-viscous force balance describe dynamic crack propagation formations during water-soaking. Result analysis shows that formation contributes improving well...

Abstract This paper presents a method for identifying the optimum soaking time between cessation of pumping, and flowback hydraulic fracturing fluids after fracture stimulation job, to increase productivity shale gas oil wells. Multiple cracks were observed at surfaces cores from reservoir under simulated water-soaking conditions. The observation proposes hypothesis that formation should well productivity. Well shut-in pressure data recorded in watersoaking process employed derive...

Complex work string dynamics are often observed when one is investigating the limit of Extended Reach Drilling (ERD), yet underlying physical causes anomalous problems not fully understood and thus a topic ongoing research interest.Theoretical models capturing tubular have been previously proposed to analyze force transfer in strings, there significant confusion regarding these because their published versions entirely consistent and, many cases, do meet engineering requirement.Further...

Greenhouse gases (GHGs) are natural occurring in the atmosphere which interact with sun to trap heat. This keeps earth warmer and makes it a habitable planet living organism. Example of these carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), water vapor. Over years there has been spike human activities as world advances more technological breakthrough being achieved, result emission increasingly large amount atmosphere. These trapped surface, this gasses an effect that increase...