Derivation of Immobile and Non-vaporizing Residual Oil Saturation under Miscible Flood from CO2 Coreflood Experiments

Iizuka, Ryo; Al-Shehhi, Hamad Rashed; Al-Hammadi, Hamdan Mohamed

doi:10.2118/161568-ms

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Various modeling methods relevant to this technical issue can be categorized into four types, although the demarcation cannot be entirely clear. A first type is the S orm method, which is available in commercial simulators to model oil-bypassing (Hiraiwa and Suzuki, 2007;Lizuka et al, 2012). It excludes the immobile oil from flash calculations so that this part of oil cannot be recovered.…”

Section: Introductionmentioning

confidence: 99%

Modeling of capacitance flow behavior in EOS compositional simulation

Okuno

2015

Journal of Petroleum Science and Engineering

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Section: Introductionmentioning

confidence: 99%

Modeling of capacitance flow behavior in EOS compositional simulation

Okuno

2015

Journal of Petroleum Science and Engineering

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Design of CO2 Injection Pilot in Offshore Middle East Carbonate Reservoir

Kumar¹,

Draoui²,

Takahashi

2016

Day 1 Mon, March 21, 2016

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Carbon dioxide (CO2) injection is considered to be a viable option for enhanced oil recovery (EOR) and has already been implemented commercially for more than 40 years. However, the applications are limited to onshore and offshore application for EOR activities have not yet been implemented. This paper presents the subsurface evaluation using laboratory experiments (PVT and corefloods) and compositional modeling, the design and surveillance program of a CO2 pilot project planned in a carbonate reservoir located offshore Abu Dhabi. PVT and coreflood experiments demonstrate the local displacement efficiency of CO2 in tertiary mode due to gas-oil miscibility, swelling of oil and reduction in oil viscosity. The screening study performed using a tuned equation of state (EOS) predicts significant additional recovery in a previously waterflooded area. A pilot is planned in one of the reservoirs of the field, which has 40 years of peripheral seawater injection history. The pilot design is influenced by existing peripheral pressure gradient, and is located down-dip in the field that covers approximately 80 acres. The pilot location is selected based on geology, reservoir quality, maturity to waterflood and surface facility constraints. A comprehensive reservoir surveillance plan, including one to two observers well, is developed to monitor pilot performance. The planned pilot will reduce uncertainties and risk associated with CO2 injection and address bottleneck uncertainties in an offshore environment before large-scale application. The first offshore CO2 injection pilot is designed for implementation in a tertiary mode in a giant carbonate field, which is still under secondary recovery production, to minimize interaction with current production and impact on surface facility. The paper also presents the possible mitigation for various challenges identified like asphaltene, scaling, corrosion, impact on existing carbon steel well completion, etc. associated with CO2 injection. The methodology and technical analysis used to evaluate and design the CO2 pilot are applicable to other potential fields in the region.

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Development of a Giant Carbonate Oil Field, Part 3: How to Build Enhanced Oil Recovery Development Plan Aiming for 70% Recovery

Kumar¹,

Nakashima²,

Draoui³

2016

Day 1 Mon, November 07, 2016

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The considered giant carbonate field is located offshore Abu Dhabi and has 50 years of production history through a series of pressure-maintenance methods. Chronologically, the implemented development approach includes gravity-driven dumpflood water injection, peripheral water injection, and immiscible crestal gas injection and a review of these methods is discussed in Pavangat et al., 2015. Since, the historical pressure maintenance methods are approaching its limitation in sustaining the production; a gradual migration towards sweep-oriented pattern development is required to further extend the plateau and is discussed in Nakashima et al., 2015. The pattern-based Improved Oil Recovery (IOR) not only extends the plateau and recovery but also set the stage for future enhanced oil recovery (EOR) development plan aiming for 70% recovery. This paper describes how a gas-based EOR development plan following the IOR plan was built, in an integrated manner, addressing the gaps and risks from core scale to field scale. The integrated development plan consists of (a) review of past gas injection pilots, (b) injectant screening based on experimental results, (c) injection scheme selection to maximize the recovery, (d) configuration of the EOR pattern, (e) EOR application timing and rate optimization considering interaction with current development plan, and (f) investigation of surface facility requirements for EOR development. A sector model study was done, using inputs from the SCAL and PVT experiments, for the screening ((b) and (c)) using the past pilot review (a). Learnings from the sector model simulation is deployed to the full field EOR application by dividing the field on the basis of maturity to water flood and historical development footprint, respecting the simplicity in EOR application without jeopardizing the ongoing production. Through simulation exercises, an integrated EOR plan was built ((d) and (e)). The proposed EOR plan efficiency is evaluated through full-field reservoir simulations, which takes practical drilling plan, well completion types and surface facilities constraints. The simulation results demonstrated that the proposed plan (a) can recover oil without bypassing remaining oil, (b) can achieves 70% recovery based on selected gas, (c) is vigorous in terms of well count and well-head tower, and (d) utilizes the available surface facilities resources at maximum. The methodology used to design and evaluate the EOR development plan is applicable to other similar fields.

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Derivation of Immobile and Non-vaporizing Residual Oil Saturation under Miscible Flood from CO2 Coreflood Experiments

Cited by 3 publications

References 8 publications

Modeling of capacitance flow behavior in EOS compositional simulation

Modeling of capacitance flow behavior in EOS compositional simulation

Design of CO2 Injection Pilot in Offshore Middle East Carbonate Reservoir

Development of a Giant Carbonate Oil Field, Part 3: How to Build Enhanced Oil Recovery Development Plan Aiming for 70% Recovery

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