Continuing Efficiency and Assurance Advances for Deepwater BOP Testing
- C. Mark Franklin (IPT GLOBAL LLC) | Richard Cully (IPT)
- 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
- 1.6.1 Drilling Operation Management, 1.10 Drilling Equipment, 1.7 Pressure Management, 1.7.5 Well Control
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- 215 since 2007
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Recently, a significant advancement in deepwater BOP leak detection was introduced through an industry sponsored software development project. This application combined innovative algorithms for validating pressure tests with an intuitive user interface for test plan management, testing and reporting. The results have validated the application's ability to achieve accurate and objective test results with a significant increase in testing clarity and leak detection efficiency. While widespread implementation presented some obstacles, such as dealing with rig motion and complex new pumping systems, these challenges were overcome. With the experiences and suggestions gathered over the past two years, the application has advanced to new levels of assurance and functionality. This paper provides a functional review of the application and significant advancements achieved over the last year.
In addition to utilizing the application to plan, conduct and report BOP pressure tests accurately, objectively and efficiently, rigs can now utilize a customized interactive schematic feature, modeling the rig's BOP and manifold within the application. Working interactively with this model, users have the ability to optimally design tests by simply clicking on valves, rams and annulars ("components??) to open or close them and visualize the resulting pressure test path. The same methodology is used to define the objectives of a test plan ("component coverage??) by selecting required valve sides and BOP rams, annulars and pipe sizes.
Throughout planning phase a visual representation of each test step is provided, including clear identification of pressure paths and component coverage. During tests, real-time updates automatically and continuously inform users of test coverage progress. Comprehensive reports ensure clear and concise communication of test plans, valve alignments and test results.
Prior to this application, the oil and gas industry had advanced very little with respect to pressure testing critical equipment on drilling rigs. As the industry began operating in deeper water, and with the use of synthetic based fluids, the challenges associated with obtaining effective pressure tests continued to grow as thermal influences on pressure responses grew more and more complex. The industry had relied on an antiquated device, the circular chart recorder (CCR), to record pressure tests and provide the only means of determining test results through the subjective interpretation of the line drawn by the recorder.
Digital charting solutions had not typically been implemented because, while a five-minute "flat-line?? could be recorded on a CCR, the accuracy of a digital recorder clearly showed pressure was continuing to decline for an extended period of time. It was more efficient to continue using the CCR, basing test results on the flat-lines produced as a result of its limited resolution. Additionally, this device provided very little with regard to properly evaluating low pressure (LP) test.
An application solution was developed in response to these challenges (Franklin, Sargent, Brown, et al. 2010, Thermally Compensated Leak Detection Results in Significant BOP Testing Efficiencies) that has evolved to provide further assurances as its next natural progression, as described in this paper.
|File Size||2 MB||Number of Pages||18|