Durability of the drill string during the construction of pipeline underwater crossings by the directional drilling method

UDK: 622.693.4 (204.1)
DOI: 10.24887/0028-2448-2018-5-88-92
Key words: durability of the drill string during, underwater crossings, main pipeline, directional drilling method, emergency situation
Authors: A.N. Sapsay (Transneft PJSC, RF, Moscow), Z.Z. Sharafutdinov (The Pipeline Transport Institute LLC, RF, Moscow), S.F. Urmancheev (Mavlyutov Institute of Mechanics, Ufa Scientific Centre of RAS, RF, Ufa)

Technical complications that arose during the construction of underwater crossings of main pipelines by directional drilling method caused the need for a detailed study of the processes of the drilling tools. Breakage the drilling tool during the underreaming of the pilot well occurred as a result of fastening of the drilling tool and the fatigue failure of metal in the body of the drill pipes. This required the development of a simulation model of the stress-strain state of drill pipes near the reamer.

The article presents the design scheme of the structure, established dangerous cross-sections and determining the effect of bending stresses on the strength of the section of the drill string. The coefficients of safety margin and endurance limit of the pipes material are determined.

The performed work allowed to form limitations on the application of technologies for underreaming the pilot wells to the drilling rig ("on yourself") and from the drilling rig ("from itself"). On the basis of calculations conclusions are drawn that if it is necessary to carry out operation of underreaming of a well by a method "from itself", there is no sufficient resource of work of a drill string in the course of underreaming. The most preferred method is to expand "on yourself", in the process of which the magnitude of the stresses in the dangerous cross-section become much smaller. For dangerous cross-section in the layout of the drill tool, the critical operation time of drill pipes is determined, at loads implemented in practice. For drill pipes operating in the hazardous area, set the service life to 520 h at a rotational speed of 32 rpm and 300 h at a rotational speed of 56 rpm.

References

1. Vafin D.R., Komarov A.I., Shatalov D.A., Zemlyanoy A.A., Controlling the stability of non-cemented grounds during construction of underwarer main pipeline crossings by directional drilling (In Russ.), Nauka i tekhnologii truboprovodnogo transporta nefti i nefteproduktov, 2016, no. 5 (25), pp. 64–71.

2. Vafin D.R., Sapsay A.N., Shatalov D.A., Technical and economic limits to the application of the horizontal direction drilling method in the construction of underwater transitions of main pipelines (In Russ.), Nauka i tekhnologii truboprovodnogo transporta nefti i nefteproduktov, 2017, V. 7, no. 3, pp. 66–73.

3. Spector Yu.I., Sharafutdinov Z.Z., Golofast S.L., Requisiti per incroci tecnologia di costruzione utilizzando trivellazione orizzontale, Italian Science Review, 2014, 12 (21), pp. 163–172, URL: http://www.ias-journal.org/archive/2014/december/Spector.pdf

4. Belyaev N.M., Soprotivlenie materialov (Strength of materials), Moscow: Nauka Publ., 1965, 856 p.

5. Kogaev V.P., Raschety na prochnost’ pri napryazheniyakh, peremennykh vo vremeni (Calculations for strength at voltages, variables in time), Moscow: Mashinostroenie Publ., 1977, 232 p.

6. Kogaev V.P., Makhutov N.A., Gusenkov A.P., Raschety detaley mashin i konstruktsiy na prochnost’ i dolgovechnost’ (Calculations of machine parts and structures for strength and durability), Moscow: Mashinostroenie Publ., 1985, 224 p.

7. Khazhinskiy G.M., Osnovy raschetov na ustalost’ i dlitel’nuyu prochnost’ (Basics of fatigue and long-term strength calculations), Moscow: LENAND Publ., 2016, 168 p.

8. PNAE G-7-008-89. Normy rascheta na prochnost’ elementov reaktorov, parogeneratorov, sosudov i truboprovodov atomnykh elektrostantsiy, opytnykh i issledovatel’skikh yadernykh reaktorov i ustanovok (Rules for arrangement and safe operation of equipment and piping of nuclear power installations), Moscow: Metallurgiya Publ., 1973, 408 p.

9. Truby neftyanogo sortamenta (Pipes of oil assortment): edited by Saroyan A.E., Moscow: Nedra Publ., 1976, 504 p.вЃ 

Technical complications that arose during the construction of underwater crossings of main pipelines by directional drilling method caused the need for a detailed study of the processes of the drilling tools. Breakage the drilling tool during the underreaming of the pilot well occurred as a result of fastening of the drilling tool and the fatigue failure of metal in the body of the drill pipes. This required the development of a simulation model of the stress-strain state of drill pipes near the reamer.

The article presents the design scheme of the structure, established dangerous cross-sections and determining the effect of bending stresses on the strength of the section of the drill string. The coefficients of safety margin and endurance limit of the pipes material are determined.

The performed work allowed to form limitations on the application of technologies for underreaming the pilot wells to the drilling rig ("on yourself") and from the drilling rig ("from itself"). On the basis of calculations conclusions are drawn that if it is necessary to carry out operation of underreaming of a well by a method "from itself", there is no sufficient resource of work of a drill string in the course of underreaming. The most preferred method is to expand "on yourself", in the process of which the magnitude of the stresses in the dangerous cross-section become much smaller. For dangerous cross-section in the layout of the drill tool, the critical operation time of drill pipes is determined, at loads implemented in practice. For drill pipes operating in the hazardous area, set the service life to 520 h at a rotational speed of 32 rpm and 300 h at a rotational speed of 56 rpm.

References

1. Vafin D.R., Komarov A.I., Shatalov D.A., Zemlyanoy A.A., Controlling the stability of non-cemented grounds during construction of underwarer main pipeline crossings by directional drilling (In Russ.), Nauka i tekhnologii truboprovodnogo transporta nefti i nefteproduktov, 2016, no. 5 (25), pp. 64–71.

2. Vafin D.R., Sapsay A.N., Shatalov D.A., Technical and economic limits to the application of the horizontal direction drilling method in the construction of underwater transitions of main pipelines (In Russ.), Nauka i tekhnologii truboprovodnogo transporta nefti i nefteproduktov, 2017, V. 7, no. 3, pp. 66–73.

3. Spector Yu.I., Sharafutdinov Z.Z., Golofast S.L., Requisiti per incroci tecnologia di costruzione utilizzando trivellazione orizzontale, Italian Science Review, 2014, 12 (21), pp. 163–172, URL: http://www.ias-journal.org/archive/2014/december/Spector.pdf

4. Belyaev N.M., Soprotivlenie materialov (Strength of materials), Moscow: Nauka Publ., 1965, 856 p.

5. Kogaev V.P., Raschety na prochnost’ pri napryazheniyakh, peremennykh vo vremeni (Calculations for strength at voltages, variables in time), Moscow: Mashinostroenie Publ., 1977, 232 p.

6. Kogaev V.P., Makhutov N.A., Gusenkov A.P., Raschety detaley mashin i konstruktsiy na prochnost’ i dolgovechnost’ (Calculations of machine parts and structures for strength and durability), Moscow: Mashinostroenie Publ., 1985, 224 p.

7. Khazhinskiy G.M., Osnovy raschetov na ustalost’ i dlitel’nuyu prochnost’ (Basics of fatigue and long-term strength calculations), Moscow: LENAND Publ., 2016, 168 p.

8. PNAE G-7-008-89. Normy rascheta na prochnost’ elementov reaktorov, parogeneratorov, sosudov i truboprovodov atomnykh elektrostantsiy, opytnykh i issledovatel’skikh yadernykh reaktorov i ustanovok (Rules for arrangement and safe operation of equipment and piping of nuclear power installations), Moscow: Metallurgiya Publ., 1973, 408 p.

9. Truby neftyanogo sortamenta (Pipes of oil assortment): edited by Saroyan A.E., Moscow: Nedra Publ., 1976, 504 p.вЃ 



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