Features of hydraulic fracturing planning and implementation while developing the low permeable highly dissected Oligocene reservoirs of Vietnam offshore fields

UDK: 622.276.66
DOI: 10.24887/0028-2448-2020-9-114-118
Key words: shelf, Oligocene, hydraulic fracturing, skin factor, proppant, lithology, reservoir, sandstone, porosity, well logging, geomechanical properties
Authors: A.S. Klevtsov (Vietsovpetro JV, Socialist Republic of Vietnam, Vung Tau), E.N. Grishenko (Vietsovpetro JV, Socialist Republic of Vietnam, Vung Tau), P.S. Balenko (Vietsovpetro JV, Socialist Republic of Vietnam, Vung Tau), A.N. Ivanov (Vietsovpetro JV, Socialist Republic of Vietnam, Vung Tau), A.A. Lubnin (Vietsovpetro JV, Socialist Republic of Vietnam, Vung Tau)

Vietsovpetro main line of business includes research activities, geological exploration, field development, production, gathering and treatment of oil, gas and condensate at the South of SRV continental shelf. Recently, the consistent downtrend of reserves quality is observed, which leads to necessity of searching the new development technologies and methods, as well as improving the existing ones. Hydraulic fracturing is one of the most applicable and effective method for low permeable highly dissected reservoirs, and it impacts both on the current production rates and ultimate recovery. Deep penetration fracturing takes effect on the bottom-hole area and uninvaded zones resulting in improving the sweeping and recovery efficiency.

The article covers the main results of implementing hydrofracturing in low permeable highly dissected Oligocene reservoirs of Vietnam offshore fields, as well as the implementation and planning features of such well intervention activities based on the obtained experience. Implementation of hydrofracturing in dissected and lithologically heterogeneous reservoirs results in development of hydrodynamically isolated undrilled and non-perforated interlayers and lenses. Replication of the best practice helps bringing the new blocks and reservoirs under development, from which the production considered ineffective or low-margin without hydraulic fracturing. New technologies implementation helps improving the designs adaptivity and broadens the hydrofracturing application criteria.

References

1. Utochnennaya tekhnologicheskaya skhema razrabotki i obustroystva mestorozhdeniya Belyy Tigr (Refined technological scheme for the development and construction of the White Tiger field), Vungtau, 2018

2. Ivanov A.N., Zyong Zan' Lam, Vasil'ev V.A., Enhanced recovery techniques in the white tiger oilfield: analysis of the effective use (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2008, no. 1, pp. 76-78.

3. Economides M., Oligney R., Valko P., Unified fracture design. Bridging the gap between theory and practice, Orsa Press, Alvin, Texas, 2002, 262 p.

4. Sadovnikov A.A. Klevtsov A.S. Kozyk S.S., Exploration of the Oligocene dense sandstone reservoirs potential of Nam Con Son shelf basin (In Russ.), Neftyanoe khozyaystvo = Oil Industry,  2018, no. 11, pp. 88–90.

5.  Kosad Ch., The choice of perforation strategy (In Russ.), Neftegazovoe obozrenie, 1998, V. 3, no. 1, pp. 34–51.

Vietsovpetro main line of business includes research activities, geological exploration, field development, production, gathering and treatment of oil, gas and condensate at the South of SRV continental shelf. Recently, the consistent downtrend of reserves quality is observed, which leads to necessity of searching the new development technologies and methods, as well as improving the existing ones. Hydraulic fracturing is one of the most applicable and effective method for low permeable highly dissected reservoirs, and it impacts both on the current production rates and ultimate recovery. Deep penetration fracturing takes effect on the bottom-hole area and uninvaded zones resulting in improving the sweeping and recovery efficiency.

The article covers the main results of implementing hydrofracturing in low permeable highly dissected Oligocene reservoirs of Vietnam offshore fields, as well as the implementation and planning features of such well intervention activities based on the obtained experience. Implementation of hydrofracturing in dissected and lithologically heterogeneous reservoirs results in development of hydrodynamically isolated undrilled and non-perforated interlayers and lenses. Replication of the best practice helps bringing the new blocks and reservoirs under development, from which the production considered ineffective or low-margin without hydraulic fracturing. New technologies implementation helps improving the designs adaptivity and broadens the hydrofracturing application criteria.

References

1. Utochnennaya tekhnologicheskaya skhema razrabotki i obustroystva mestorozhdeniya Belyy Tigr (Refined technological scheme for the development and construction of the White Tiger field), Vungtau, 2018

2. Ivanov A.N., Zyong Zan' Lam, Vasil'ev V.A., Enhanced recovery techniques in the white tiger oilfield: analysis of the effective use (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2008, no. 1, pp. 76-78.

3. Economides M., Oligney R., Valko P., Unified fracture design. Bridging the gap between theory and practice, Orsa Press, Alvin, Texas, 2002, 262 p.

4. Sadovnikov A.A. Klevtsov A.S. Kozyk S.S., Exploration of the Oligocene dense sandstone reservoirs potential of Nam Con Son shelf basin (In Russ.), Neftyanoe khozyaystvo = Oil Industry,  2018, no. 11, pp. 88–90.

5.  Kosad Ch., The choice of perforation strategy (In Russ.), Neftegazovoe obozrenie, 1998, V. 3, no. 1, pp. 34–51.


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