Evaluation, Impact, and Management of Casing Deformation Caused By Tectonic Forces in the Andean Foothills, Colombia
- Nigel C. Last (BP plc) | Santiago Mujica (BP Exploration Colombia Ltd.) | Phillip D. Pattillo (BP America) | Gary T. Kelso (BP Exploration Colombia Ltd.)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2006
- Document Type
- Journal Paper
- 116 - 124
- 2006. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 5.6.3 Deterministic Methods, 5.1.2 Faults and Fracture Characterisation, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 4.1.5 Processing Equipment, 1.14 Casing and Cementing, 1.14.1 Casing Design, 5.3.2 Multiphase Flow, 1.2.2 Geomechanics, 2.7.1 Completion Fluids, 2 Well Completion, 1.6 Drilling Operations, 3 Production and Well Operations, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties)
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Ovalization of casing strings has been detected in the tectonically active foothills of Colombia, South America, initially through operational difficulties, and subsequently, by extensive monitoring. The effect of this ovalization on cross-sectional collapse has been numerically and experimentally analyzed in a previous publication (Pattillo et al. 2004). The current study emphasizes the broader context to which those detailed results were applied. Here, the emphasis will fall on characterizing the deformation, assessing its impact on well integrity, and developing a strategy for managing the consequences to achieve improved business and operational decision making.
Casing deformation (ovalization) has been observed in many re-entered wells in BP's Colombian acreage, and some operational problems have been attributed to this—primarily, restricted access and failures caused by reduced collapse resistance. While drilling in the area has been plagued by problems associated with severe wellbore instability (Last et al. 1996), there is now compelling evidence that the somewhat unusual rock stresses resulting from the tectonic environment are also causal to the observed deformation of casing strings after wells have been completed; analogues have not been found.
Following early detection of ovality in wells, a monitoring policy was initiated to provide both a basis on which to characterize the changing geometry and key information for assessing well access and integrity.
Conventional collapse formulas predict a dramatic reduction in collapse resistance as ovalization increases, but the field experience in Colombia refutes this. An earlier companion study (Pattillo et al. 2004) addresses the physics of this apparent inconsistency. Numerical simulations, validated by laboratory testing, provide both insight and new collapse-resistance adjustments for ovalized pipe.
The improved understanding was used to create an operational strategy for managing the impact of casing ovalization. Implementation of the strategy provides both a statistical, risk-based means for planning wells and intervention, and important input to assessments of well and field economics.
|File Size||1 MB||Number of Pages||9|
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