Browsing by Subject "Drilling platforms"
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Item Application of fracturing technology in improving volumetric sweep efficiency in enhanced oil recovery schemes(2012-05) Pirayesh, Elias; Soliman, Mohamed Y.; Menouar, Habib K.; Siddiqui, ShameemThe industry has developed methods to improve sweep efficiency during Enhanced Oil Recovery processes. These methods include the use of certain injection/production patterns, drilling horizontal and deviated wells, use of special chemicals as well as inflow control devices (ICDs). The purpose of the first two methods is to create an even movement of injection fluid across the reservoir. Special chemicals have been used to divert the injected fluid to eliminate channeling and to improve sweep efficiency. Inflow control devices have been used to delay water or gas breakthrough, making possible a more efficient drainage of the reservoir while maximizing production and recovery. The technique presented in this work creates a mechanical barrier to flow by introducing a fracture to the formation at a strategic location. This fracture is then filled with a conformance fluid which eventually becomes impermeable to fluid flow. The effects of various design parameters on the performance of barrier-fractures have been investigated and the results are presented. These design parameters include barrier-fracture length & location, number of barrier-fractures, and mobility ratio. It is illustrated that the breakthrough time and potential productivity of producing wells increase as a result of enhancing the volumetric sweep efficiency of hydrocarbons.Item Stochastic response of tension leg platform to wave and current forces(Texas Tech University, 1988-05) Lee, Jun-HeeThe linear analysis in the frequency domain is presented for the surge motion of a tension leg platform (TLP) in the case of random waves only and random waves with constant current. A single-degree-of-freedom model of a TLP is employed for response, A simulation technique for determining the exact response statistics of nonlinear structural systems is developed in the time history. The superposition method, one of the simulation techniques, is applied to random sea wave with current, and the response analysis of TLP in time is developed with wave velocity and wave acceleration simulations. Wave force is calculated using the modified Morison equation. The relative velocity due to the wave particle movement and the TLP movement is considered in both analyses. Current velocity that has a horizontal profile is applied for the model. The effect of wave-current interactions on the response analysis of TLP is examined. Computational methods for both analyses are developed, and the results of stochastic, dynamic response of the TLP, with and without the presence of current, are discussed.