The experience of the rotary steerable systems application in the drilling of directional wells at fields of Vietsovpetro JV

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Key words: directional drilling, rotary steerable system (RSS), zenith angle
Authors: O.V. Kryukov, Nguyen Quoc Phong, G.G. Lapukhin (Vietsovpetro JV, the Socialist Republic Vietnam, Vung Tau)

The article describes experience in implementing the rotary steerable system (RSS) for drilling deviated wells under Vietsovpetro conditions. Identified main advantages of such drilling systems application, analysed the quality of the open hole and shown the occurred problems. Geometrics comparative study for boreholes drilled by combination system with downhole drilling motor and with RSS, shown that in case of RSS borehole inclination and azimuth angle amplitude, as well as the deviation rate, is much lower. Therefore, implementation of RSS significantly reduces the tortuosity of the wellbore, improves the construction quality of the open hole and reduces the complications occurrence risks during drilling, running into hole and setting the casings; improves the general well construction quality.

The authors discuss the drilling scopes of subcontracting companies Schlumberger and Baker Hughes, which provide services in deviated drilling with implementation of rotary steerable system-RSS for six years and cost efficiency of such technology application for the given period, which combined by the increased drilling rate and consequently decreased drilling time.

Having conditions of high rent rate for jack-up rigs offshore operation, reduction of technological operations duration, including the reduced time for mechanical drilling, has significant influence on general economic costs during construction of production and appraisal wells. Having that, the companies conducting the offshore drilling are interested in application of the most advanced drilling technologies, which allow reducing the wells construction time.

References

1. Kelly S., Rotary controlled systems (In Russ.), Neft' i gaz Evrazii, 2012, no 6,

pp. 44–46.

2. Menand S., A new buckling severity index to quantify failure and lock-up

risks in highly deviated wells, SPE 151279, 2012.

3. Mason C., Wellbore quality characterization for drilling and casing running

in challenging wells, SPE 112813-DL, 2007.

The article describes experience in implementing the rotary steerable system (RSS) for drilling deviated wells under Vietsovpetro conditions. Identified main advantages of such drilling systems application, analysed the quality of the open hole and shown the occurred problems. Geometrics comparative study for boreholes drilled by combination system with downhole drilling motor and with RSS, shown that in case of RSS borehole inclination and azimuth angle amplitude, as well as the deviation rate, is much lower. Therefore, implementation of RSS significantly reduces the tortuosity of the wellbore, improves the construction quality of the open hole and reduces the complications occurrence risks during drilling, running into hole and setting the casings; improves the general well construction quality.

The authors discuss the drilling scopes of subcontracting companies Schlumberger and Baker Hughes, which provide services in deviated drilling with implementation of rotary steerable system-RSS for six years and cost efficiency of such technology application for the given period, which combined by the increased drilling rate and consequently decreased drilling time.

Having conditions of high rent rate for jack-up rigs offshore operation, reduction of technological operations duration, including the reduced time for mechanical drilling, has significant influence on general economic costs during construction of production and appraisal wells. Having that, the companies conducting the offshore drilling are interested in application of the most advanced drilling technologies, which allow reducing the wells construction time.

References

1. Kelly S., Rotary controlled systems (In Russ.), Neft' i gaz Evrazii, 2012, no 6,

pp. 44–46.

2. Menand S., A new buckling severity index to quantify failure and lock-up

risks in highly deviated wells, SPE 151279, 2012.

3. Mason C., Wellbore quality characterization for drilling and casing running

in challenging wells, SPE 112813-DL, 2007.



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