CO2 Sequestration in Deepwater Subseabed Formations

Pilisi, Nicolas; Ceyhan, Ismail; Vasantharajan, Sriram

doi:10.2118/139498-ms

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…In 2012, CO 2 accounted for 85% of all U.S. greenhouse gas emissions (State, 2010). Different authors have discussed the applicability of CO 2 sequestration in underground formations (depleted oil reservoirs, saline water aquifers, or salt caverns), in order to reduce the effect of global warming and also to enhance oil recovery (EOR) (Benson and Cole, 2008;Espie, 2005;Mohamed and Nasr-El-Din, 2013;Pilisi et al, 2010). One of the effective ways to reduce carbon dioxide (CO 2 ) emissions is CO 2 sequestration.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Ibrahim

Nasr‐El‐Din

2015

Europec 2015

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Geological sequestration of CO 2 in coal seams has become an attractive carbon sequestration technology for two reasons. First, the injection of CO 2 or mixtures of CO 2 and N 2 enhances methane production from coalbeds (ECBM). Second, it reduces the effect of global warming by storing CO 2 . The sequestration of CO 2 in Tiffany and Allison fields in the San Juan Basin is an example of this technology. The efficiency of this process is strongly dependent on the wetting behavior of the coal-water-CO 2 system and the CO 2 diffusion rate from the cleat network, through the micro-cleats, and to the matrix surface, which is improved if the coal is CO 2 wet.This study aims to investigate the effects of the salt type and concentration of coal seam water, the solubility of CO 2 in water, and the injected gas composition on the wettability of a highly volatile bitumen coal with 82 wt% carbon content from Bull Hill, Oklahoma. Contact angles in the coal-water-CO 2 system were measured using a captive bubble method at pressures up to 1000 psi. Adsorption isotherm measurements were conducted to confirm the effect of salt concentration on the CO 2 /coal surface adsorption behavior. The zeta potential was measured to examine the effects of the salt concentration on coal hydrophobicity.The results showed that the coal tended to be CO 2 wet as the pressure increased where the contact angle changed from 80°at atmospheric pressure to 125°at high pressure (1000 psi). It was found that the salt concentration increased the coal wettability to the CO 2 . NaCl increased the contact angle values from 125°t o 140°with a NaCl concentration of 15 g/L. It was found that MgCl 2 and CaCl 2 slightly increased the contact angles. These results were confirmed by measuring the adsorption isotherm and the zeta potential at different water salinities. The CO 2 adsorption was improved as the salt concentration increased and the absolute zeta potential value decreased, especially in NaCl cases. It was found that the contact angles of flue gases were generally smaller than those of CO 2 and the contact angles did not exceed 90°even at high pressures and high N 2 contents (81°at 1000 psi for 100% N 2 ). The solubility of CO 2 in water did not affect the stabilized contact angle values but it minimize the stabilization time as the solubility increased.Based on these observations, for CO 2 storage and ECBM purposes, injection of CO 2 into highly volatile bitumen coal seams is more efficient as the salt concentration content increase. However, other types of coals might show different behaviors due to their varying rank and mineral compositions.

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Section: Introductionmentioning

confidence: 99%

Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Ibrahim

Nasr‐El‐Din

2015

Europec 2015

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“…Pilisi and Ceyhan carried out a feasibility study of CO2 sequestration in deep water formations in the Gulf of Mexico [12]. They performed complete description of the whole process of the CO2 capture and sequestration including the technical limitations from the surface to the underground storage.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that, deep water sub-seabed sequestration provides an enormous storage capacity to counteract increasing world consumption of fossil fuels. Pilisi and Ceyhan concluded that, large scale simulations are needed to investigate the impact of geochemical reactions on the deep water sea bed region and also the impact of the liquid CO2 injection on the water chemistry in the deep water [12].…”

Section: Introductionmentioning

confidence: 99%

Dual Benefit of CO2 Sequestration: Storage and Enhanced Oil Recovery

Mahmoud¹

2017

PPEJ

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Carbon dioxide (CO2) sequestration is usually implied in geological formations because; they can provide the pore volumes needed to store large amount of CO2; they have adequate permeability required for efficient injection; and they are widely distributed geographically. They also possess the seal (Cap rock) needed to keep the stored CO2 in place. Of all the sedimentary formations, saline aquifers have the largest global sequestration capacity. Saline aquifers might exist at the bottom of an oil reservoir that acting as a pressure support to the oil reservoir. CO2 can be sequestered in saline aquifers underlying oil reservoirs or in saline aquifers that are located away from the oil reservoirs. In this study the dual benefit of CO2 sequestration will be introduced in which the CO2 will be injected in saline aquifers underlying oil reservoirs. The CO2 will be injected in the aquifer at the bottom part using different well schemes (horizontal and vertical wells). Numerical reservoir simulation software was used to build the reservoir and aquifer models and to carry out the CO2 injection and oil recovery. The injected CO2 will migrate from the aquifer to the oil zone and the oil will be produced through oil producers. Different combination between CO2 injectors and oil producers will be used to maximize the amount of stored CO2 and the oil recovery. The simulation results showed that CO2 can be stored in saline aquifers underlying oil reservoirs. The saline aquifer will start releasing CO2 to the oil zone after it gets saturated with CO2. The aquifer dissolved 5% of its volume CO2 and after this saturation whatever CO2 injected migrated to the oil zone and reduced the viscosity of oil and increased the oil recovery. Horizontal well gave better storage capacity and also gave better recovery compared to vertical wells. The oil recovery increased by 75 % of the residual oil using this method after seawater injection.

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“…In 2012, CO 2 accounted for 85% of all U.S. greenhouse gas emissions (State 2010). This technique was used in order to reduce the effect of global warming and to enhance oil recovery (EOR) (Espie 2005;Benson and Cole 2008;Pilisi et al 2010;. One of the most effective ways to reduce CO 2 emissions is sequestration.…”

Section: Introductionmentioning

confidence: 99%

CO2 Sequestration in Unmineable Coal Seams

Ibrahim

Nasr‐El‐Din

2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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Carbon dioxide (CO 2 ) is a major greenhouse gas that is emitted in all activities. CO 2 sequestration in coal enhances methane production from the coalbed (ECBM) in addition to storing CO 2 . CO 2 can be stored in coalbeds in three ways: free gas within the pore space or fractures in the coal, adsorbed on the organic surface of the coal, or dissolved in the groundwater within the coal.This paper addresses the effect of the salinity of the coal seam water, injected gas composition, and formation pressure on the CO 2 sequestration in volatile bitumen coal. In order to achieve these objectives, coreflood tests were conducted using coal cores. The displacement efficiency of water by CO 2 and the effective water permeability change due to CO 2 adsorption were measured.The coreflood experiments showed that the permeability reduction due to coal swelling was significant in the case of high NaCl concentrations. The permeability reduction changed from 22 to 32% with the salinity increasing from DI to 20 g/L NaCl. The displacement efficiency increased as the salinity increased. The water saturation after CO 2 injection decreased from 37 to 25% with salinity increasing from DI to 20 g/L NaCl. Also, as N 2 concentration increased in the injection gas, the permeability reduction and the sweep efficiency decreased. In the case of DI water and 50% N 2 , the permeability reduction was 12%, and the residual water saturation was 47%.Based on these observations, CO 2 sequestration and ECBM into highly volatile bitumen coal seams with high salt concentration is more efficient compared to low salt concentration.

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CO2 Sequestration in Deepwater Subseabed Formations

Cited by 6 publications

References 16 publications

Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Effects of Water Salinity, CO2 Solubility, and Gas Composition on Coal Wettability

Dual Benefit of CO2 Sequestration: Storage and Enhanced Oil Recovery

CO2 Sequestration in Unmineable Coal Seams

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