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
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