There is an increasing requirement for centralized analysis of drilling data to improve performance. Typically, data from service companies is transmitted from the rig to the clients Real Time Operating Centre (RTOC). A major problem is the quality of this data, which can lead to incorrect analysis and a breakdown in trust between the rig and the RTOC. Currently real time data is, at best, only checked for completeness. In this work, we present a model for data quality control in real-time operating centres. The following points are considered in our suggested model:Monitoring the quality of real time data for: o Completeness o Continuity o Timeliness o Validity o Accuracy o Consistency o Integrity Alarming of all unexpected data;Generating daily data quality reports.The suggested data quality control model has different groups of key performance indicators, calculated in real time from the streamed data. The model then takes the values of these performance indicators as input, and evaluates different properties of data quality as the output. Additionally, a new group of intelligent model-based key performance indicators is suggested. These indicators give the possibility to monitor actual quality and measure it against the expected one. The result is a measurement of Quality of Service (QoS) supplied by data provider at the rig.

INTRODUCTIONE xcavations at two sites in Gwynedd have produced new evidence for highland zone rural settlement during the Romano-British period. At Bryn Eryr this activity was the culmination of a long sequence of development during the Iron Age. At Bush Farm, similarly, a Romano-British phase succeeded earlier, probably late prehistoric occupation of the site. At both locations significant structural changes took place during the Romano-British period as small stone-walled houses replaced larger, clay-walled buildings. Changes in the local farming economy have been identified and the proximity of the vicus at Segontium provided access to Roman pottery vessels. The quality and range of pottery from Bryn Eryr and Bush Farm are considerable in comparison with other 'Highland Zone' settlements and the material is discussed in detail.It is intended that the Iron Age sequence at Bryn Eryr be described in a separate article, currently in preparation. 1 BACKGROUND TO THE EXCAVATIONS