Experience RS

The More (Laterals) The Merrier

Heavy oil operators in northern Alberta's Peace River and Clearwater plays are using multilateral drilling technology to develop their assets. Multiple horizontal legs branch off one vertical wellbore to increase reservoir contact that, in turn, improves production. By using a single vertical wellbore, the design reduces capital and operating costs, thereby increasing capital efficiencies.

Each lateral leg in Alberta is assigned a unique well identifier (UWI), shown in Figure 1. The production feeding the vertical wellbore comes from the multiple laterals, making it a challenge to analyze well performance without being able to normalize results by cumulative lateral length or considering the number of horizontal segments feeding the commingled production stream. One multilateral UWI is arbitrarily assigned as a producer and reports all production from these multiple lateral legs. The laterals that do not report production are referred to by the regulator as drain wells (Figure 2). 

To analyze the performance of multilateral wells, RSEG developed a spatial model to group laterals with the UWI in which their production flows through (Figure 3). This tagging allows for a more efficient analysis of multilateral well designs to compare results after taking into account the total length of the well exposed to the reservoir.

FIGURE 1 | Peace River Wells Colored by UWI

Source | RSEG

FIGURE 2 | Peace River Wells Colored by Well Type

Source | RSEG

FIGURE 3 | Peace River Wells Colored by RSEG Well Grouping

Source | RSEG

 


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