Fatigue strength of oilwell tubings screwed joints in wells curvelinear sections

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Authors:

Ye.І. Kryzhanivskyi, Corresponding Member of the National Academy of Science of Ukraine, Dr. Sci. (Tech.), Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Rector, Professor of Oil and Gas Equipment Department, Ivano-Frankivsk, Ukraine.

V.М. Ivasiv, Dr. Sci. (Tech.), Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Professor of Oil and Gas Equipment Department, Ivano-Frankivsk, Ukraine.

R.V. Rachkevych, Cand. Sci. (Tech.), Associate Professor, Ivano-Frankivsk National Technical University of Oil and Gas, Senior Lecturer of Machine Mechanics Department, doctoral candidate of oil and gas equipment department, Ivano-Frankivsk, Ukraine.

V.Ya. Vasylyshyn, Cand. Sci. (Tech.), Ivano-Frankivsk National Technical University of Oil and Gas, Assistant Lecturer of Engineering and Computer Graphics Department, Ivano-Frankivsk, Ukraine.

Abstract:

Purpose. Analysis of the intense-deformed state of oilwell tubings and calculation of fatigue straight characteristic of its screwed joints for longevity prediction in curvilinear cased well bore.

Methodology. The deformation of oilwell tubings and the normal stresses of the bend, which arise, were determined using integration of differential equation of elastic line with boundary conditions, which depend on well bore survey. A model of longitudinal-transverse bend of beam in plane was chosen as a calculation scheme. In particular, radial and axial components of weight were taken into consideration; force of tension caused by oilwell tubings that are placed below the drill interval under consideration; additional force of tension caused by the column of pumped fluid. Laboratory research of fatigue straight of oilwell tubings screwed joints was conducted too. The experiment was carried out under the regular loading of bend with symmetrical cycle of stresses.

Findings. Basic causes, types and allocation of failures of oilwell tubings elements were distinguished as a result of processing of statistical information about oilwell tubings operation. The method of analysis of oilwell tubings intense-deformed state was developed. This method allows assessing bending stress values and time behavior depending on external loading and geometrical parameters of curvilinear borehole. Two-parameter stress-cycle diagram for oilwell tubings with external diameter 89 mm was drawn.

Originality. The research showed that the oilwell tubings column in curvilinear borehole is affected by statical and dynamical bending moments in addition to the variable axial force. These moments appear due to the additional tension force caused by weight of fluid column, which influences working barrel valve during downward motion of rod hanger. We found out that bending moments could cause fatigue breakdown of oilwell tubings.

Practical value. The developed method can be used for calculation of normal stresses and prediction of oilwell tubings fatigue strength during operation in curvilinear borehole.

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Rachkevych, R.V. (2006), “Prediction of drill string fatigue life in abnormal conditions of wells drilling”, Abstract of Ph.D. dissertation, Machines for Oil and Gas Industry, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine.

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