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

Vedachalam, N.; Ramesh, S.; Jyothi, V. Bala Naga; Prasad, N. Thulasi; Ramesh, R.; Sathianarayanan, D.; Ramadass, G. A.

doi:10.1016/j.jngse.2015.05.009

Cited by 44 publications

(15 citation statements)

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“…Enormous amounts of natural gas hydrates have been discovered with significant resource potential. These massive resources may be exploited for energy recovery in near future. ,− Furthermore, hydrates have potential applications in CO 2 sequestration, desalination, gas storage, gas transportation, and refrigeration. ,− In contrast, gas hydrates are a nuisance for offshore oil and gas industries as they create significant problems resulting in severe blockages in flow pipelines due to production from deep offshore regions. − Additionally, hydrate formation and its rapid dissociation during offshore drilling operations may pose a serious threat such as an increase in the gas kick, increased drill bit pressure, plugging of the blowout preventer, and choking of valves with natural gas hydrates. − Gas hydrate phase equilibrium data is frequently required to understand its stability to suitably design oil and gas facilities . A wide range of data on the phase equilibrium of hydrates has already been generated, which has been frequently utilized to ascertain the conditions at which a natural gas mixture forms hydrates.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibrium of Methane Hydrate in Aqueous Solutions of Polyacrylamide, Xanthan Gum, and Guar Gum

2019

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The use of water-soluble polymers as natural gas hydrate inhibitors has gained interest in recent years. Variety of polymers have been studied for their kinetic performance in methane hydrate inhibition in the past; however, thermodynamic hydrate inhibition by water-soluble polymers is not fully understood and needs further investigation. This study investigates the effect of molecular weights and concentrations of aqueous solutions of various oilfield water soluble polymers on phase equilibrium of methane hydrate. Water-soluble polymers, such as polyacrylamide (PAM), xanthan gum (XG), and guar gum (GG) with two different molecular weights and varying concentrations, have been considered for the investigations. These are as follows: PAM (Mw: 1.1 × 106 g/mol, PAM-1 and 1.5 × 105 g/mol, PAM-2), XG (Mw: 6.4 × 105 g/mol, XG-1 and 2.4 × 105 g/mol, XG-2), and GG (Mw: 1.7 × 106 g/mol, GG-1 and 6 × 105 g/mol, GG-2), with varying concentrations of 100, 200, and 500 ppm each. These are referred to as high-molecular-weight polymers (PAM-1, XG-1, and GG-1) and relatively low-molecular-weight polymers (PAM-2, XG-2, and GG-2). The experiments have been conducted in the pressure and temperature range of 8.63–5.50 MPa and 284.6–279.8 K, respectively. The results indicate that the water-soluble polymers have shown thermodynamic hydrate inhibition with an average temperature depression ranging from 0.25 to 1.05 K. The molecular weight and the concentration of polymers have been shown to affect the hydrate inhibition tendency. We have also proposed a hypothesis for hydrate inhibition based on the mobility of the polymer chain in the solution with a desired functional group in relation to nonelectrolyte/electrolyte thermodynamic hydrate inhibitors. The presented study on methane hydrate phase stability in the presence of various oilfield polymers is vital for their use in the design and development of hydrate inhibitive drilling fluids for offshore wells, hydrate-bearing formations, and studies related to the recovery of methane from hydrate-bearing sediments using polymer injection.

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Section: Introductionmentioning

confidence: 99%

Phase Equilibrium of Methane Hydrate in Aqueous Solutions of Polyacrylamide, Xanthan Gum, and Guar Gum

2019

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“…Therefore, the model built should handle the complex multifield coupling processes and cover different phases. In this work, TOUGH + HYDRATE 62 software was employed to address this issue because the software was generally used to simulate gas recovery from hydrate reservoirs in marine and permafrost regions, 27,28,30,[63][64][65] The geomechanical response was not considered because the influence of effective stress variation on the sediment and fracture properties in GHBS at this site during depressurization is currently unclear, even though the coupled thermo-hydro-mechanical model was proposed and used to perform the coupling processes during drilling and gas recovery. 25,29,[66][67][68][69][70][71][72] However, the assigned permeability of fractures takes the influence of the effective stress into account.…”

Section: Numerical Simulation Codementioning

confidence: 99%

“…Consequently, many investigations (eg, Refs. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] have been performed recently, and numerical simulations have still focused on depressurization that is aimed at commercial production from potential target areas. In practice, depressurization has also been widely adopted in field trials in Mallik, 34 the eastern Nankai Trough, 35,36 and the South China Sea.…”

Section: Introductionmentioning

confidence: 99%

Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

Sun

Ning

Liu

et al. 2019

Energy Science & Engineering

119

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The low permeability of silty hydrate reservoirs in the South China Sea is a critical issue that threatens safe, efficient, and long‐term gas production from these reservoirs. Hydraulic fracturing is a potentially promising stimulation technology for such low‐permeability reservoirs. Here, we assess the gas production potential of a depressurization horizontal well that is assisted by the hydraulic fracturing using numerical simulation according to field data at site SH2 in this area. In addition, the number of horizontal wells drilled is discussed if commercial production is to be performed at this site. The results show that the production potential can be significantly stimulated at the early production stage by adopting hydraulic fracturing in this reservoir due to a better depressurization effect. However, the increase in gas recovery gradually decreases with the continuous dissociation of gas hydrates, and the evolution trend is similar to that in a reservoir without stimulation during later periods of gas production because the dissociation front gradually moves away from the fractures. From the perspective of production potential, using a horizontal well scheme assisted by the hydraulic fracturing technology for gas recovery from a hydrate deposit can sharply reduce the number of operation wells, shorten the drilling operation time, and boost the economic efficiency. The horizontal well scheme may be an effective way to increase the gas yield if the application of quickly deployed horizontal wells and hydraulic fracturing techniques in such hydrate reservoirs greatly increases in the near future.

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“…The global energy demand is estimated to increase by 25% from 2014 to 2040. , This increase in the energy demand will put a lot of pressure on conventional energy resources unless we develop suitable methods to produce oil and gas from unconventional oil and gas resources. The natural gas hydrate has recently gained significant attention as potential unconventional gas resources and has huge potential in meeting energy demand from the consumer and industry in near future. , An enormous amount of natural gas hydrate deposits have been discovered in the continental margin and permafrost locations. − A unit volume of gas hydrates contains almost 164 units of gas in its structure . It is estimated that the hydrate deposits have about 5 × 10 15 m 3 of methane gas .…”

Section: Introductionmentioning

confidence: 99%

Polymer-Assisted Chemical Inhibitor Flooding: A Novel Approach for Energy Recovery from Hydrate-Bearing Sediments

Gupta

Nair

Sangwai

2021

Ind. Eng. Chem. Res.

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Recent production technologies to extract methane from mysterious hydrate reservoirs are not effective and need additional efforts to develop novel technologies to improve methane production. Chemical inhibitor injection is appraised as an effective method due to ease in operation, improved energy efficiency, and reduced threat of hydrate reformation. In the current study, several experiments on methane recovery have been performed in a simulated laboratory-based hydrate reservoir by injecting chemical inhibitors and combinations of aqueous chemical inhibitor/polymer systems. Different combinations of inhibitors and polymers, viz., chemical inhibitors such as methanol, ethylene glycol, methanol + polyacrylamide, and so forth, with varying concentrations, have been explored. Polyacrylamide has been used as in our previous study, it was shown that it can act as a better kinetic hydrate inhibitor, and also, the same polymer is often used for the enhanced oil recovery process in the upstream oil industry. In total, seven different simultaneous hydrate formation and dissociation experiments were performed. The inhibitor + polymer aqueous solution was injected to produce methane by dissociating the hydrate. The gas production ratio and the effectiveness of inhibitor aqueous solution and pure inhibitor in terms of methane recovery from hydrate-bearing sediments have been discussed and analyzed. This study provides a good insight into the use of some of the conventional hydrate inhibitors along with the oilfield polymer for methane recovery from hydrate-bearing sediments.

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

Cited by 44 publications

References 44 publications

Phase Equilibrium of Methane Hydrate in Aqueous Solutions of Polyacrylamide, Xanthan Gum, and Guar Gum

Phase Equilibrium of Methane Hydrate in Aqueous Solutions of Polyacrylamide, Xanthan Gum, and Guar Gum

Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

Polymer-Assisted Chemical Inhibitor Flooding: A Novel Approach for Energy Recovery from Hydrate-Bearing Sediments

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