A Deepwater Openhole Gravel-Pack Completion With Prolonged Well Suspension Without Initial Cleanup: An Angola Block 15/06 Case History

Downhole gauge (DHG) data analysis is a powerful tool in not only identifying, or minimizing the potential number of, root causes for any failures that may occur during gravel packing, but also in either verifying or calibrating friction pressure data used in gravel placement simulations. Although downhole pressure and temperature gauges are often used in open-hole gravel packing and expertise in analyzing the data certainly exists in companies that routinely use downhole gauges, there is no publication that comprehensively discusses the methodology. DHG data analysis in general requires more information than the gauge data itself. This includes logs, wellbore schematic, pumping schedule, fluid properties, return flow measurements, daily rig reports, and data relevant to displacements. The objective of this paper is to provide guidelines for DHG data analysis to completion engineers who are not routinely involved and thus not experts in such analysis, by detailing the factors that must be kept in mind, offering a methodology and demonstrate the methodology with several examples.

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Downhole Gauge Data Analysis of Open-Hole Gravel Packing Treatments: Methodology and Examples

Kumar

Beldongar

Agee

et al. 2018

Day 1 Wed, February 07, 2018

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Successful Installation of Horizontal Openhole Gravel-Pack Completions in Low Fracture Gradient Environment: A Case History from Deepwater West Africa

Jeanpert

Banning

Abad

et al. 2018

Day 2 Thu, February 08, 2018

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This paper presents the design and execution of an openhole gravel-pack completion campaign in deepwater West Africa. Based on field history and past challenges, a novel approach was implemented to address the low fracture gradient. Various aspects of the gravel pack design are discussed - drilling and gravel pack fluid selection, screen selection, openhole displacement, filtercake removal, placement technique, and pumping design. The placement method uses screens with shunt tubes, an existing technology, that was deployed in an unconventional manner. Post treatment evaluation and analysis are also presented. Results are compared to conventional gravel pack placement and to previous wells from this field. The success of the first completion enabled an increase in openhole length in subsequent wells. The understanding of the packing sequence was consolidated after each well, driving the optimization of the pumping schedule.

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Key Successful Factors in Deep Water Development - Eni Experience in West Africa

Lamberti¹,

Colombi²,

Calderoni³

et al. 2018

Day 1 Mon, November 12, 2018

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2018 will be the brightest year for upstream investment since 2014. Costs reduction and the oil price stabilization gives operators confidence in launching new challenging projects. However, launching new projects is still particularly challenging for deep-water assets. Even if project costs are 20% lower than mid-2014, deep-water projects are not yet competitive with tight oil, considering also the higher associated uncertainty. The direction to improve is clear: further cost cuts, through leaner development principles and improved well designs. Moreover, operators have to take advantage from lesson learned of projects already in production. Eni has consolidated on its West Africa deep-water assets a workflow that can support challenging projects FID through: Reduction of time to market parallelizing project phasesManagement of project uncertainty through flexibilityWork in integrated teams taking advantage from digital transformation More in details, the first target is to reduce time to market anticipating free cash flow generation. This is achieved through an appraisal while developing phase: drilling appraisal as first wells of development campaign, derisking the following well locations. Time-to-market reduction is achieved by parallelizing development phases, starting development plan definition during exploration phases and anticipating procurement of long lead items. This is possible if subsurface uncertainty has been properly defined through robust 3D models and if projects can guarantee the flexibility to capture new opportunities: fine tune well locations during drilling campaign, keep spare slots availability and sidetrack opportunities, substitute water and gas injectors with water alternate gas wells (WAG). In addition, Digital Transformation offers more and more the possibility to continuously update 3D models thanks to the availability of real time data, run thousands of simulations on super computers and monitor in real time field performance, taking advantage from simple daily operations. This work is aimed to describe the steps that were the key successful factors of Eni operated deep water projects in West Africa. The presented workflow can now be considered a standard approach for the most challenging Eni's projects and supported the company to reach record time-to-market for the execution of challenging deep-water projects in the range of 2,5 to 4 years from authorization to first oil.

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A Deepwater Openhole Gravel-Pack Completion With Prolonged Well Suspension Without Initial Cleanup: An Angola Block 15/06 Case History

Cited by 6 publications

References 8 publications

Downhole Gauge Data Analysis of Open-Hole Gravel Packing Treatments: Methodology and Examples

Downhole Gauge Data Analysis of Open-Hole Gravel Packing Treatments: Methodology and Examples

Successful Installation of Horizontal Openhole Gravel-Pack Completions in Low Fracture Gradient Environment: A Case History from Deepwater West Africa

Key Successful Factors in Deep Water Development - Eni Experience in West Africa

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