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Evaluation of different technologies efficiency to intensify the development of multilayer and sharply heterogeneous objects

UDK: 622.276.1/.4.038
DOI: 10.24887/0028-2448-2017-6-104-108
Key words: multilayer objects, low-permeability reservoirs, dual completion technology, geological-statistic section, production forecast, reserve recovery, hydrofracturing
Authors: A.V. Fomkin, A.Ya. Fursov, V.V. Shcherbina (VNIIneft JSC, RF, Moscow)

Nowaday multilayer objects are usually developed using unified well spacing. In this case target reserves recovery is provided by implementation of dual completion technology. When net oil thickness is significant and there are a number of oil-bearing layers in a well profile implementation of this technology has severat limits.

Based on original method of well production forecast the authors explored a possibility and limits of dual completion technology application. Cases when it is necessary to implement alternative technology also are regarded.

As an object of research we choose terrigenous reservoirs of one of the fields in South-East Asia. Regarded commingled production zone included complex system of blocks (areas). Each block was characterizied by its own number of oil-bearing layers; layers had different hydrodynamic forces and reservoir energy. We carried out representative sampling of wells. Analysis of the sample allowed to devide wells into four groups. Well production in these groups depended on thickness and properties of layers along borehole profile. In groups characterisied as better lythotipes (sum of reservoir beds) dual completion technology is convient for enhancing wells production. In groups characterisied as worse lythotipes performance capability of this technology decreases. To develop this type of reserves hydrofracturing should be used. Hydrofracturing in this case provides with mild but stable incremental oil rate.

The results of analysis show it is necessary to use a complex of well production enhancement methods and to take into account geological features of local sites of development object.

References

1. Khisamov R.S., Nasybullina S.V., Latifullin F.M., Estimate of dual completion effect on field production rate and recovery factor by example of the Romashkinskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 3, pp. 50–53.

2. Yanin A.N., Baryshnikov A.V., Kofanov O.A., Trukhan A.Ya., Evaluation of dual completion mass application effect on the oil recovery factor of a multilayer low-permeability formation (In Russ.), Burenie i neft', 2011, no. 5, pp. 46–49.

3. Yanin A.N., The design principles of ultra-low permeability reservoirs (In Russ.), Burenie i neft', 2016, no. 11, pp. 22–24.

4. Fomkin A.V., Fursov A.Ya., Khakhulina M.V., Issledovanie usloviy povysheniya effektivnosti razrabotki mnogoplastovykh ob"ektov (Study of conditions for increasing the efficiency of  multi-layered objects development), Collected papers “Povyshenie effektivnosti razrabotki mestorozhdeniy s trudnoizvlekaemymi zapasami nefti” (Increasing the efficiency of hard-to-recover oil reserves development), 2015, V. 153, pp. 6–26.

5. Fomkin A.V., Fursov A.Ya., Khakhulina M.V., Otsenka potentsiala skvazhin, ekspluatiruyushchikh mnogoplastovye ob"ekty (Evaluation of the potential of wells exploiting multilayer objects), Collected papers “Issledovaniya tekhnologiy razrabotki trudnoizvlekaemykh zapasov nefti” (Studies of technologies for the development of hard-to-recover oil reserves), 2016, V. 154, pp. 5–19.

6. Fomkin A.V., Fursov A.Ya., Rationale for selection of consolidated blocks of multilayer and multideposit formations for development analysis (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 11, pp. 110–114.

Nowaday multilayer objects are usually developed using unified well spacing. In this case target reserves recovery is provided by implementation of dual completion technology. When net oil thickness is significant and there are a number of oil-bearing layers in a well profile implementation of this technology has severat limits.

Based on original method of well production forecast the authors explored a possibility and limits of dual completion technology application. Cases when it is necessary to implement alternative technology also are regarded.

As an object of research we choose terrigenous reservoirs of one of the fields in South-East Asia. Regarded commingled production zone included complex system of blocks (areas). Each block was characterizied by its own number of oil-bearing layers; layers had different hydrodynamic forces and reservoir energy. We carried out representative sampling of wells. Analysis of the sample allowed to devide wells into four groups. Well production in these groups depended on thickness and properties of layers along borehole profile. In groups characterisied as better lythotipes (sum of reservoir beds) dual completion technology is convient for enhancing wells production. In groups characterisied as worse lythotipes performance capability of this technology decreases. To develop this type of reserves hydrofracturing should be used. Hydrofracturing in this case provides with mild but stable incremental oil rate.

The results of analysis show it is necessary to use a complex of well production enhancement methods and to take into account geological features of local sites of development object.

References

1. Khisamov R.S., Nasybullina S.V., Latifullin F.M., Estimate of dual completion effect on field production rate and recovery factor by example of the Romashkinskoye oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 3, pp. 50–53.

2. Yanin A.N., Baryshnikov A.V., Kofanov O.A., Trukhan A.Ya., Evaluation of dual completion mass application effect on the oil recovery factor of a multilayer low-permeability formation (In Russ.), Burenie i neft', 2011, no. 5, pp. 46–49.

3. Yanin A.N., The design principles of ultra-low permeability reservoirs (In Russ.), Burenie i neft', 2016, no. 11, pp. 22–24.

4. Fomkin A.V., Fursov A.Ya., Khakhulina M.V., Issledovanie usloviy povysheniya effektivnosti razrabotki mnogoplastovykh ob"ektov (Study of conditions for increasing the efficiency of  multi-layered objects development), Collected papers “Povyshenie effektivnosti razrabotki mestorozhdeniy s trudnoizvlekaemymi zapasami nefti” (Increasing the efficiency of hard-to-recover oil reserves development), 2015, V. 153, pp. 6–26.

5. Fomkin A.V., Fursov A.Ya., Khakhulina M.V., Otsenka potentsiala skvazhin, ekspluatiruyushchikh mnogoplastovye ob"ekty (Evaluation of the potential of wells exploiting multilayer objects), Collected papers “Issledovaniya tekhnologiy razrabotki trudnoizvlekaemykh zapasov nefti” (Studies of technologies for the development of hard-to-recover oil reserves), 2016, V. 154, pp. 5–19.

6. Fomkin A.V., Fursov A.Ya., Rationale for selection of consolidated blocks of multilayer and multideposit formations for development analysis (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 11, pp. 110–114.



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