Comprehensive Review of Damages and Repairs on Drill Pipe Connections
- Thomas Michael Redlinger (Weatherford International Ltd.) | Albert Odell (Weatherford) | Steve Griggs (Weatherford) | Stein Bergo (EuroIncon AS)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 6-8 March, San Diego, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2012. IADC/SPE Drilling Conference and Exhibition
- 4.1.5 Processing Equipment, 1.10 Drilling Equipment, 4.1.2 Separation and Treating, 4.2.3 Materials and Corrosion, 2 Well Completion, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6 Drilling Operations, 1.1 Well Planning, 4.3.4 Scale
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In the last two decades the drilling industry has experienced major changes in both drillpipe connections and related inspection criteria. Many operators and contractors now regularly use premium drill pipe connections to drill all sections of their wells. One result of this is that the drilling community is often surprised by the amount of post-well drillpipe repairs that are required. There is little or no established statistical data available to budget repairs in any given well program. Instead they have been left to guess how much to budget into a given drilling project.
This paper will review data from two inspection databases containing in excess of 200,000 joints of drill pipe. The records were derived from operational data obtained from several years of drill pipe inspection. The databases contain inspection records for premium, double shoulder and API connections. The paper will discuss how different inspection standards, premium connections, etc. can affect the "damages?? at the end of the drilling program. The objective of the paper is to provide planning factors to the drilling community in order to provide a basis for budgeting repair costs and to highlight the impact of connection selection and inspection standards on repairs.
One of the financial surprises in well planning that is often overlooked is the impact of the cost of repairing drill pipe. These costs can be high and in some cases the damage incurred can result in the downgrade and replacement of an entire string of drill pipe. This is not the normal case, but what is? Our industry has been inspecting drill pipe for decades, meticulously recording the current state of the drill pipe during the inspection, but what have we done with this information. The simple answer is not much. Normally the information is placed in the well file and forgotten. Although many drillers have developed some personal knowledge of what is a "normal?? amount of damage for their drilling conditions, this information is rarely share or placed in the public domain for comparison. As a result there exists a lack of full understanding of the inspection data because it is not available in a common database that can be readily accessed. In addition the inspection, inspectors and standards vary by customers, geographic regions, well profiles, rigs, drilling contractors and rental companies. These variations make it very difficult to make a reasonable compilation of the data required to create an accurate estimate of damages that may result from drilling operations. Such an estimate is important, as these costs can be significant.
This understanding may now be within reach since several databases have been tracking the inspection data and damage results for the last several years. The information contained within these databases should be able to form a basis for our drilling community to understand both the average results, and the variations in damages on drill pipe connections.
|File Size||1 MB||Number of Pages||20|