Agenda

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Candidate selection is the process of identifying and selecting wells for stimulation treatment, which have the capacity of production improvement and better economic return. One of the first steps in the candidate selection process is the review of all well logs and records, reservoir characteristics, and any previous workover information. Drilling records are screened for mud type, fluid losses, kill pills, completion fluids, and completion type. Production history also used to detect formation damage in the process of candidate selection. A sudden decline in productivity is a good indication that the well could be damaged; however, the user needs to be aware of the offset wells reservoir properties. Offset well comparison can be helpful in identifying localised problems. In brownfield situations, there is often a water flood or even a more sophisticated EOR scheme in the reservoir that needs to be considered, both as a cause of the issue as well as a broader solution to the system. Wells with an inadequate amount of perforations, tubing size, or some types of restrictions in the wellbore are not good candidates. However, the selection process can be improved by using all available information. In this session, we will examine and discuss the process of candidate selection, as well as the range of solutions from simple to complex.

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The objective of this session is to discuss possible completion designs when matrix acidising. Furthermore, a completion design which suggests the thought process of stage design consideration and suggestions to improve the distribution of fluid along a lateral. Due to the rise of data abundance, what can be the potential changes to our current workflow and data selection? Should we consider the data, which we have not considered earlier? And most importantly, how does a completion department balance with well economics?

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Recent advancements in fluids technology have provided a step-change in capability for acid stimulation treatments, specifically degradable diverters and modified acid systems. While such systems are readily available on the market, detailed mechanistic understanding and validated modelling are still being developed. This session is designed to share learnings and experiences during the research, development, and application of such systems in order to improve their use and further advance the technology. Presentation of field applications (and operational advantages/disadvantages) and results in matrix, naturally-fractured, and hydraulically-fractured applications are desired. Innovations in additives technology, including corrosion inhibition, improving compatibility, and non-acid stimulation fluids are also of interest.  

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Modelling of the wormholing process in carbonate matrix acidising includes mechanistic models, proxy models like the dual continuum models, global wormhole propagation models, and acid placement and diversion models. Theses modelling efforts are all aimed at increasing our understanding of the wormholing process and improving field design procedures. A carbonate acidising modelling focus in recent years has been on the scale-up of wormholing behaviour measured in small core plugs in the laboratory to the wormholing that occurs in the essentially unbounded flow field around wells. Recent upscaling approaches for carbonate matrix acidising will be highlighted.

This session will review modelling progress made recently in all these areas of carbonate acidising modelling. Speakers will show how the current modelling approaches are being applied to field design, and to evaluation of field acidising responses.

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The session provides valuable case histories regarding acid fracturing execution and outcomes. It also discusses the recent advances in modelling and experimental research. Subjects include near-wellbore diversion that is applied to laminated formations or multiage hydraulic fracturing (MSF). Far-field diversion to enhance acid penetration length will be covered. Carbonate formations are usually naturally fractured and the impact on acid fracture stimulation is considered in the session. The impact of reservoir mineralogy, permeability, rock strength, and depth on optimum design conditions are to be discussed. The session considers the improvement in predictive models to estimate acid fractured well-productivity.

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Unconventional carbonate reservoirs present a significant hydrocarbon potential which can be tapped through improved stimulation. This session presents case studies on the  stimulation techniques used in tight unconventional carbonate reservoirs. Discussions on candidate selection, job design and execution, acid systems, and other new technologies will be presented.

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This session is designated for discussion on acid stimulation monitoring. With current development in downhole sensing, production logging, and transient rate and pressure diagnostic tools, evaluating the efficiency of acid stimulation in acid distribution, skin evolution, and productivity improvement become possible. The session will present the monitoring technology, diagnostic models, and field applications.