Successful Auto Gaslift using Intelligent Completion Boosted Oil Production – A Case History from Petroleum Development Oman

Peringod, Chandran; Al-Ruheili, Sharifa Moh'd; Kerecin, Zeljko; Sonti, Kartik; Sukkestad, Tor

doi:10.2118/148474-ms

SPE/IADC Middle East Drilling Technology Conference and Exhibition 2011

DOI: 10.2118/148474-ms

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Successful Auto Gaslift using Intelligent Completion Boosted Oil Production – A Case History from Petroleum Development Oman

Chandran Peringod¹,

Sharifa Moh'd Al-Ruheili²,

Zeljko Kerecin³

et al.

Abstract: Field B is undergoing implementation of an accelerated development plan and around 40 wells have been drilled so far. Due to the volatile nature of the crude and high GOR, gas recycling was identified as the reservoir pressure maintenance strategy. There are 4 gas injectors in the field injecting into two reservoirs. As per the original development plan, no artificial lift was envisaged and model results showed sustained natural flow from the well. However, after drilling and completing the wells, it was found… Show more

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Cited by 3 publications

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Production Optimization and Zonal Allocation for Auto Gas Lift Wells: A Case Study from Oman

Al-Ruheili¹,

Angelatos²,

Nair³

et al. 2012

Abu Dhabi International Petroleum Conference and Exhibition

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In Auto gas-lifted wells, gas from either a gas zone or gas cap is used to lift oil in a commingled way. Balancing gas zone energy depletion to the benefit of oil production requires an accurate understanding of zonal contribution and an ability to adjust and control inflow from both zones.A project was undertaken for accurate zonal allocation and optimization of lift gas rates by designing an appropriate zonal contribution measurement procedure for five Auto gas-lifted wells on two fields. This approach utilized both production logging and production testing to obtain both zonal down hole and commingled surface flow measurements. As a result of the exercise, lift gas flow into the tubing was optimized, thus maximizing the oil production rate while conserving reservoir energy through efficient gas usage.Measurement of zonal contributions in multi-zone intelligent well completions are often challenging due to the complex nature of fluid flow under varying dynamic conditions of multiple reservoirs. This paper will explain the zonal contribution measurement program design, implementation, interpretation of data and lessons learnt from the project.

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Production Optimization and Zonal Allocation for Auto Gas Lift Wells: A Case Study from Oman

Al-Ruheili¹,

Angelatos²,

Nair³

et al. 2012

Abu Dhabi International Petroleum Conference and Exhibition

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Production Optimization of Heterolithic Reservoirs through Completion Strategy and Reservoir Management: A Case Study of Cream Field

Nayagawa¹,

Amrasa²,

Ayeni³

et al. 2014

All Days

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Reservoir quality in terms of Net-to-Gross (NTG) remains one of the critical components in determining the Hydrocarbon-initially-In-Place (HCIIP), recoverable reserves and production rates of any producing field. Often times, fluvial channel and shoreface deposits are credited to have very good reservoir qualities, hence are choice candidates for completions post-drill of the well. In addition, examples exist of heterolithic sands from which considerable reserves have been recovered during the life-cycle production of the Cream Field in the Niger Delta basin, Nigeria. Improved production from these reservoirs is associated with optimization of well designs. Heterolithic deposits are made up of interbedded sand and mud/shale. These deposits are typically laid down in environments like the tide dominated deltaic and estuarine environments as found in the Niger Delta of Nigeria.The Heterolithic sands found in the field to be discussed are mainly lower shoreface sands with lesser transgressive sand units; lower energy, variably sorted sandstones which are typically finely laminated and commonly intensely bioturbated. There is a continuous transition between heterolithic and shoreface sands. Reservoir quality tends to increase upwards as the heterolithic sands grade into shoreface sands.The sands have poor Kv/Kh values due to presence of shale laminates within the sand deposits. This exacerbates the poor sweep efficiency of the oil with high possibility of by-passed oil. The overall impact of these challenges is low recovery factors assigned to the sands.Due to the properties and nature of the heterolithic sands mentioned above, there is usually low pressure support due to poor aquifer connectivity as a result of the depositional environment, thus triggering a depletion drive mechanism.Interestingly, some of these heterolithics hold considerable recoverable volume that makes the exploitation of such reserves important. Such is the case offshore Norway, Alaska, Canada, Venezuela, Russia, Nigeria and indeed world-wide. As a result, production optimization therefore becomes critical to maximize recovery from wells completed on this facie type.The paper reviews the occurrence of this heterolithics in a field in the Niger Delta, the challenges faced with the current completion strategy and the reservoir management practices. A major challenge as observed in conventional crestal completion on the structure is early gas breakthrough from secondary gas cap formation. Methods of enhancing recovery from heterolithics using improved completion strategy and the requisite reservoir management practices are set forth in the body of the paper.Completion strategies like horizontal wells targeted at the good quality sands has shown an additional potential 1300bopd (seen in the performance of the only horizontal well in the field) as compared to performance of conventional wells, simulation study of water injection and gaslift has also indicated an increase in reserves by 10MMstb.

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Modeling and Optimization of Horizontal Well Completions Located in Gas Injection Patterns of Hassi Messaoud Oilfield

Mahboub

Otmanine

Salhi

2015

Day 4 Wed, December 09, 2015

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In The giant Hassi Messaoud Oilfield, horizontal and short radius wells are mostly crossing more than one layer and many of them are crossing two compartments, where gas breakthrough is occurring in some layers and compartments. There are three main objectives of the present study. Firstly, is to improve oil productivity while reducing the gas breakthrough production. The second aim is to preserve the accumulated injected gas gained over decades of time. The third objective is to maintain the miscibility conditions within some injection gas patterns as initially planned.Two principles have been used to complete the study. The first one is the composite inflow performance relationship ЉIPRЉ between oil and gas reservoir systems crossed by a horizontal well, whereas the second option is a smart well completion implementation and modeling of horizontal wells crossing two layers having two reservoir pressures due to gas injection wells.Three categories of results have been obtained. Primarily, well modeling and optimization of horizontal well without smart completion, and secondly an implementation of intelligent completion model for horizontal well crossing different intervals in gas breakthrough. Some scenarios of optimizations have been done based on the available input of well. Finally, it will be possible to maintain the miscibility conditions within a gas injection pattern using the intelligent completion option.

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Successful Auto Gaslift using Intelligent Completion Boosted Oil Production – A Case History from Petroleum Development Oman

Cited by 3 publications

References 9 publications

Production Optimization and Zonal Allocation for Auto Gas Lift Wells: A Case Study from Oman

Production Optimization and Zonal Allocation for Auto Gas Lift Wells: A Case Study from Oman

Production Optimization of Heterolithic Reservoirs through Completion Strategy and Reservoir Management: A Case Study of Cream Field

Modeling and Optimization of Horizontal Well Completions Located in Gas Injection Patterns of Hassi Messaoud Oilfield

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