An approach for methane hydrates reservoir dissociation in a marine setting, Krishna Godhavari Basin, east coast India

Evaluation of the depressurization based technique for methane hydrates reservoir dissociation in a marine setting, in the Krishna Godavari Basin, east coast of India

“…8 shows the simulated flow and power requirements, so as to maintain the DP of 90 bar for a progressive pressure profile from the well head in a reservoir with a PDP of 500 mD. Computations are done to estimate the power requirements for producing and maintaining a DP of 90 bar, and using a pump discharge hose of 0.3 m diameter with a relative flow surface roughness of 0.03 (Ramesh et al, 2014). It is identified that due to the lower water flow rates involved, the dynamic head requirements for the pump are negligible and the power requirement is mainly due to the static head involved in pumping, against a head of 1070 m. The power curve shows a theoretical power requirement (without considering the efficiencies of the pump, motor and electrical transmission) of about 60 kW, when dissociating gas hydrate sections at a distance of 1000 m from the well bore.…”

“…7 and 9. To overcome this, and to accelerate the depressurization process in the initial stages, thermal methods such as hot water injection (Li et al, 2011)or in situ electro thermal heating methods (Ramesh et al, 2014) could be required.…”

“…Based on the hydrate formation mechanism, changes in the pressure, and temperature conditions of the gas hydrate reservoir, will result in gas hydrate dissociation resulting in the release of methane gas (Myshakin et al, 2012;Zatsepina et al, 2011). Different combinations of methods are in the conceptual and field testing stage for exploiting gas hydrates; the methods being considered include thermal stimulation (Ramesh et al, 2014;Kurihara and Narita, 2011) depressurization (Zhao et al, 2013;Kanno et al, 2014), inhibitor injection and molecular substitution (Seo et al, 2013;Duyen et al, 2012). However, owing to the challenges in the controlled and sustained release of methane by considering the environmental challenges and economic factors, a suitable technology for extraction on a commercial scale is yet to be realized .…”

Review of unconventional hydrocarbon resources in major energy consuming countries and efforts in realizing natural gas hydrates as a future source of energy

“…Field scale production concepts using simulation models are proposed, based on hot water circulation, applicable to the Shenhu Area in South China Sea and in-situ electro thermal modeling applicable to the KG basin on the East Coast of India (Ramesh et al, 2014). However, the techniques need to be scaled up to meet the economic levels of production.…”

State‐of‐the‐art brief review on sanding problem of offshore natural gas hydrates sediments

“…14 Based on the preceding research and field trial production, low productivity comes from two reasons. First, the development of NGH relies on the phase change of NGH, which absorbs the heat continuously,the heat transfer causes a low-temperature zone near the wellbore which keeps expanding with the development process going on; 15 the low temperature slows down the NGH gasification process. 16 Second, a tremendous amount of formation sand flows into the wellbore and causes the wellbore blockage.…”