Evaluation the Geological Uncertainties to Increase the Benefit of Offshore Project

Shi, Hongfu; Chen, Jianbo; He, Yifan; Yue, Baolin

doi:10.4043/30072-ms

Day 1 Mon, November 02, 2020 2020

DOI: 10.4043/30072-ms

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Evaluation the Geological Uncertainties to Increase the Benefit of Offshore Project

Hongfu Shi¹,

Jianbo Chen²,

Yifan He³

et al.

Abstract: The quality of oil and gas reservoirs, initial production and the recovery factor are important factors affecting the revenue of development projects. Understanding geological potential and risk is of great significance for judging the uncertainty of a project, avoiding risks, and improving project returns. Reservoir depth, sand thickness, connectivity, permeability, porosity, oil viscosity, etc. determine the quality of reservoirs. In addition, well pattern, well type (horizontal or vertical wells), well spac… Show more

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Cited by 4 publications

References 9 publications

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How to Block the Water Channels by High-Density Polyethylene Particles Supersaturated Filling Out-of-Screen and Inflow Control Device in Heterogeneous Sandstone Reservoir

Shi¹,

Xu²,

Cai³

et al. 2021

Day 2 Wed, September 22, 2021

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At present, the Bohai Oilfield has entered the late stage of high water cut, with a high degree of flooding and an average water cut of more than 80%. Horizontal wells were widely used in tapping the potentials of high water-cut oilfields with avoiding local water flooding, accurately develop enrichment of remaining oil, and improving initial productivity. Until 2020, there are more than 1,200 horizontal wells in the Bohai Oilfield, with daily production accounting for more than 40% of the entire oilfield. However, mainly continental deposits, strong heterogeneity, heavy oil, relatively large mobility ratio, long-term water flooding, and large liquid production have resulted in the obvious dominant channels in the formation, intensified ineffective water circulation, and low oil recovery. The application of horizontal wells faces huge challenges due to the serious water flooding and the prevalence of thief zones. Inflow Control Device (ICD) is becoming more and more prevalent in bottom water reservoirs as it can delay the water breakthrough and significantly improve the economic benefit of a project by producing more oil and less water. The strong microscopic heterogeneity along the horizontal water channeling outside the screen or water channeling along the annulus between the screen and ICD tubular is responsible for the short term even ineffective effect of conventional ICD. Based on the review of the conventional ICD application in the Q oilfield, a workflow is present to design and optimize hybrid ICD to increase the success probability of the validity period of water control.

show abstract

How to Block the Water Channels by High-Density Polyethylene Particles Supersaturated Filling Out-of-Screen and Inflow Control Device in Heterogeneous Sandstone Reservoir

Shi¹,

Xu²,

Cai³

et al. 2021

Day 2 Wed, September 22, 2021

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Integrated Solutions for the Redevelopment Plan of Offshore Mature-Oilfield

Shi¹,

Liu²,

Jiang³

et al. 2021

Day 9 Wed, March 31, 2021

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Abundant faults, long oil-bearing intervals (up to 500m), and diverse fluids including conventional oil and heavy oil, result in P oilfield became one of the most complex oil fields in the Bohai Bay. The main characters ofinitial development plan are directional well with commingle production, open hole completion, large draw down, high oil production rate, and reverse nine-point well pattern. At present, the oilfield has entered a stage of high water cut, with average water cut more than 85%. What can we do next, decommissioning or rebirthing? An integrated solution was proposed to redevelop the oilfield which focus on the layers’ subdivision, the fine description of the sand body,a large number of horizontal wells on the top of the water-flooded layer are used to tap the potential, increase the water injector to transform the stream lines and rebuild the reservoir pressure, and search for potential sand bodies to increase reserves.

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Cost Effective Framework of Integrated Development of Offshore Marginal Oilfields - Case Study of a Heavy Oil Reservoir with Thin Layers

Liu¹,

Shi²,

Xu³

et al. 2022

Day 4 Fri, March 25, 2022

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The Bohai bay is rich in oil and natural gas resources. Over the past 40 years, a series of different types of large and medium-sized offshore oil and gas fields have been successfully discovered and developed. The newly discovers, however, is marginal either smaller in size or poor in reservoir quality which can't be economically and efficiently developed with the current conventional exploitation methods. The development of such marginal assets is of great significant for the the sustainability of Bohai production. In this paper, L oilfield is taken as an example to explain how to establish a framework in developing such marginal oilfields cost-effectively through multi-disciplinary cooperation. The L oil field is one of the typical marginal green-oil fields discovered recently in the Bohai Bay which characterized as low OOIP, limited certain reservoir spaces for well placement and challenges economically for standalone development (Adeogun Oyebimpe, August 2018, Mohamed, A. Zakariya.March 2003). In addition, primarily thin oil layers at the average single layer thickness only 2.1 m, high crude oil viscosity at the average of 2000mpa·s, and low single well productivity less than 300 barrels per day. However, the L oil field geographically is next to a large oil field which is only 12km away. How to maximize the success chance of penetrating the sweet spot of those thin layers, and therefore achieve higher initial oil productivity, to form a complete injection-production well pattern for long period stability in production and to minimize capital investment through joint development with surrounding oilfields is the way out for L oilfield development.

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Evaluation the Geological Uncertainties to Increase the Benefit of Offshore Project

Cited by 4 publications

References 9 publications

How to Block the Water Channels by High-Density Polyethylene Particles Supersaturated Filling Out-of-Screen and Inflow Control Device in Heterogeneous Sandstone Reservoir

How to Block the Water Channels by High-Density Polyethylene Particles Supersaturated Filling Out-of-Screen and Inflow Control Device in Heterogeneous Sandstone Reservoir

Integrated Solutions for the Redevelopment Plan of Offshore Mature-Oilfield

Cost Effective Framework of Integrated Development of Offshore Marginal Oilfields - Case Study of a Heavy Oil Reservoir with Thin Layers

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