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Analysis of Non-Productive Time (NPT) in Drilling Operations- A Case Study of the Ghadames Basin

Date post: 07-Mar-2020
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Abstract An event which causes the drilling operation to stop is described as a Non-Productive Time (NPT) event. Understanding the reasons for the NPT is the starting point to reducing drilling time and saving money. The NPT is defined as time which drilling operation is ceased or penetration rate is very low. Time spent on fishing, pipe stuck, weather, tool transportation, lost circulation and tripping in/out can be counted as NPT. No well is drilled without problems. Managing drilling risk means not letting small problems become big ones. Knowing what the risks are and when they are likely to occur keeps surprises to a minimum. Most of the time spent drilling, and most of the cost, is encountered not in the reservoir, but in getting to it. The NPT events have been divided into two categories; geological or subsurface related and other issues or (non- geological related). This paper analyses the drilling operation time for 5 wells in the Ghadames Basin. The NPT events in drilling operations currently account for 18% of total drilling time in the selected wells and the analysis showed that waiting water and lost circulation are major causes of NPT in the selected wells in the Ghadames Basin. Keywords: Non Productive Time, drilling, productivity, Lost Circulation.
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Page 1: Analysis of Non-Productive Time (NPT) in Drilling Operations- A Case Study of the Ghadames Basin

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