Науковий вісник НГУ

Fatigue strength of oilwell tubings screwed joints in wells curvelinear sections

• 
• 

User Rating:  / 0

PoorBest 

Details

Category: Mining

Last Updated on 04 February 2016

Published on 04 February 2016

Hits: 3986

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.

References:

1. Василишин В.Я. Підвищення працездатності різьбових з’єднань труб нафтового сортаменту: автореф. дис. на здобуття наук. ступеня канд. техн. наук: спец. 05.05.12 «Машини нафтової та газової промисловості» / Василишин Віталій Ярославович; Івано-Франків. нац. техн. ун-т нафти і газу, 2013. – 20 с.

Vasylyshyn, V.Ya. (2013), “Improving the perfor-mance of threaded pipe connections oil grades”, Abstract of Cand. Sci. (Tech.) dissertation, Machines for Oil and Gas Industry, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine.

2. Новая жизнь треугольной резьбы. Преимущества ис-пользования диффузионных цинковых покрытий для соединения труб нефтяного сортамента / Е. Проскуркин, С. Арустамов, В. Евдокимов [и др.] // Национальная металлургия. – 2007. – № 2. – С. 24–30.

Proskurkin, Ye. Aructamov, S. and Yevdokimov, V. (2007), “Service advantage of zinc diffusion coating for threaded pipe joints”, Natzionalnaya Metallurgiya, no. 2, pp. 24–30.

3. Оцінка впливу коливань колони насосно-компресорних труб на умови роботи різьових з’єднань / С.Ф. Савула, В.Т. Колодій, Є.В. Харченко [та ін.] // Науковий вісник Національного технічного університету нафти і газу. – 2004. – № 2 (8). – С. 116–125.

Savula, S.F., Kolodii, V.T. and Kharchenko, Ye.V. (2004), “Assessment of influence of flow column’s oscillations on work conditions of screw joints”, Naukovyi visnyk Natzionalnoho Tekhnichnoho Universytetu Nafty i Hazu, no. 2 (8), pp. 116–125.

4. Атнагулов А.Р. Прогнозирование технического состояния УЭЦН при эксплуатации с оценкой динамических нагрузок: автореф. дис. канд. техн. наук: 05.02.13 «Машины, агрегаты и процессы» (нефтегазовая отрасль) / А.Р. Атнагулов. – Уфа, 2008. – 24с.

Atnagulov, A.R. (2008), “Prediction of technical state of electro centrifugal pumping equipment with estima-tion of dynamic loads”, Abstract of Cand. Sci. (Tech.) dissertation, Machines, Aggregates and Processes (Oil and Gas Sector), State Oil’s Technical University of Ufa, Ufa, Russia.

5. Ишмурзин А.А. Методика расчета крутящих моментов в трубах и штангах, возникающих при спуске в скважину с пространственным искривлением ствола / А.А. Ишмурзин, Хоанг Тхинь Нян // Нефтегазовое дело. – 2006. – № 1.− С. 2−7.

Ishmurzin, A.A. and Khoang Tkhin Nyan, (2006), “Methodology of calculation of torsional moments in drill pipes and bucket rods, which arise when it lowers in hole with 3D curve of borehole”, Neftegazovoe Delo, no.1, pp. 2–7.

6. Скважинные насосные установки для добычи нефти /[ Ивановский В.М., Дарищев В.И., Сабиров А.А. и др.] – М.: ГУП Изд-во «Нефть и Газ» РГУ нефти и газа им. И.М. Губкина, 2002. – 824c.

Ivanovskiy, V.M., Darishchev, V.I., Sabirov, A.A., Kashtanov, V. and Pekin, S. (2002), Skvazhennye nasosnye ustanovki dlya dobychi nefti [Wells Pumping Facilities for Extraction of Oil], Oil and Gas, Moscow, Russia.

7. Артим В.І. Підвищення експлуатаційної надійності трубних і штангових колон для буріння та видобування нафти і газу: автореф. дис. на здобуття наук. ступеня д-ра. техн. наук: спец. 05.05.12 «Машини нафтової та газової промисловості» / Артим Володимир Іванович; Івано-Франків. нац. техн. ун-т нафти і газу, 2010. – 36 с.

Artym, V.I. (2010), “Increase of operation reliability of drill and rod columns for oil and gas drilling and extraction”, Abstract of Dr. Sci. dissertation, Machines for Oil and Gas Industry, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine.

8. Рачкевич Р.В. Прогнозування довговічності бурильної колони в ускладнених умовах буріння свердловини: автореф. дис. на здобуття наук. ступеня канд. техн. наук: спец. 05.05.12 «Машини нафтової та газової промисловості» / Рачкевич Руслан Володимирович; Івано-Франків. нац. техн. ун-т нафти і газу, 2006. – 20 с.

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.

2015_05_kryzhanivskyi
2016-02-03  530.71 KB  953

• Next >