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Real Time Advanced Flow Analysis for Early Kick/Loss Detection & Identification of Open Fractures.

Authors
Rasha Al-Muraikhi (KOC) | Adnan Al-Shamali (Kuwait Oil Company) | Ibrahim Abdullah Alsammak (Kuwait Oil Company) | Javad Estarabadi (GEOLOG International) | Alberto Martocchia (GEOLOG International) | Gionata Ferroni (GEOLOG International) | N. Marai (GEOLOG International) | M. Janbakhsh (GEOLOG International)
DOI
https://doi.org/10.2118/167335-MS
Document ID
SPE-167335-MS
Publisher
Society of Petroleum Engineers
Source
SPE Kuwait Oil and Gas Show and Conference, 8-10 October, Kuwait City, Kuwait
Publication Date
2013
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-291-3
Copyright
2013, Society of Petroleum Engineers
Disciplines
1.8 Formation Damage, 1.14 Casing and Cementing, 5.6.4 Drillstem/Well Testing, 3 Production and Well Operations, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 4.3.3 Aspaltenes, 5.1.2 Faults and Fracture Characterisation, 1.7.5 Well Control, 1.10 Drilling Equipment, 1.6.9 Coring, Fishing, 1.6 Drilling Operations, 1.11 Drilling Fluids and Materials
Keywords
Fracture detection, Early Kick and loss
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Abstract

Development, delineation and appraisal wells drilled in high pressured, naturally fractured Jurassic reservoirs of West Kuwait are exposed to the risk of "well kicks?? and "mud-losses??. The risk becomes greater due to differential reservoir pressures, presence of naturally open fractures, and narrow pressure window between formation- and fracture-pressures. In many instances, "alternate loss & gain scenario?? ensues and the well control options become limited, occasionally, further drilling becomes impossible leading to temporary suspension or even termination of the wells. This causes safety issues and large loss of rig time and money.

On the other hand, lack of high formation pressure and absence of open natural fractures can lead to unproductive wells. Therefore, characterization of natural fractures is needed not only for productivity of the well, but also to ensure successful drillability of the well. Conventional fracture characterization using geophysical methods lacks resolution, while petrophysical methods often fail to conclusively identify open fractures in in-situ sub-surface conditions. Other well testing methods such as wire-line formation testing and open-hole drill stem testing are also cumbersome and risky and often not usable in tight fractured reservoirs. In this context, the micro-mud loss detection technique becomes indispensable for both mud loss and kick detection as well as for the natural fracture characterization.

Mud losses data appear to be the only way to detect and characterize the conductive fractures in these reservoirs. In fact, the cores show that almost all the natural fractures are cemented and only a few partially open fractures can be seen. When coring operations are not fully successful, it is difficult to assess if poor recovery was due to the presence of open fractures or to other causes. Furthermore, it is impossible to use image logs in order to individuate potentially producing intervals, as they cannot discriminate between open and closed fractures.

File Size  428 KBNumber of Pages   5

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