Abstract
Transient behavior analysis, including rate transient analysis (RTA) and pressure transient analysis (PTA), is a powerful tool to investigate the production performance of the vertical commingled well from long-term production data and capture the formation parameters of the multilayer reservoir from transient well testing data. Current transient behavior analysis models hardly consider the effect of vertical non-uniform boundary radii (VNBR) on transient performances (rate decline and pressure response). The VNBR may cause an obvious novel radial flow regime and rate decline type, which can easily be mistaken as a radial composite reservoir. In this paper, we present a VNBR transient behavior analysis model, the extended vertical uniform boundary radii (VUBR), to investigate the rate decline behavior and pressure response characteristics through diagnostic type curves. Results indicate that the dimensionless production integral derivative curve or pressure derivative curve can magnify the differences so that we can diagnose the outer-convex shape and size of the VNBR. Therefore, it is significant to incorporate the effects of VNBR into the transient behavior analysis models of the vertical commingled well, and the model proposed in this paper enables us to better evaluate well performance, capture formation characteristics and diagnose flow regimes based on rate/pressure transient data.
Highlights
With the depletion of conventional oil and gas resources, more and more complex, multilayer oil and gas reservoirs have been discovered with the improvement of exploration technology
The objective of this paper is to investigate the influence of vertical non-uniform boundary radii (VNBR) on transient behavior and explore the corresponding relation between them
To characterize the effect of vertical non-uniform boundary radii (VNBR) on rate decline behavior and pressure response, we developed the combined type curves of VNBR and equivalent vertical uniform boundary radii (VUBR)
Summary
With the depletion of conventional oil and gas resources, more and more complex, multilayer oil and gas reservoirs have been discovered with the improvement of exploration technology. The well production performance and reservoir evaluation are of great significance for enhancing recovery in multilayer oil and gas field development [1,2,3]. Both production decline analysis and well testing analysis are important dynamic technologies for petroleum engineers to evaluate well performance [4,5,6]. Their main focus was four types of analysis: transient behavior analysis (including pressure transient analysis (PTA) [7,8,9,10,11,12] and rate transient analysis (RTA) [12,13,14,15]), vertical-heterogeneity analysis [16,17,18] and boundary effect analysis [19,20,21], for a commingled well in a multilayer reservoir.
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