Productivity Logging (PROLOG)

PROLOG is a service for analyzing the performance of individual layers in multilayer wells. It identifies the contribution of each layer to total production, pinpoints the causes of production decline, and justifies targeted measures to restore and increase production.

In multilayer development, conventional survey methods often cannot reliably assess the parameters of each producing interval. PROLOG solves this by processing multi-rate production logging surveys and applying multilayer deconvolution algorithms.

The analysis is run in the PolyGon software and builds a digital model of the well's performance and of its individual layers.

PROLOG determines the key parameters of each layer:

• oil, water and liquid flow rate
• water cut
• current reservoir pressure
• productivity index
• effective producing thickness
• permeability
• skin factor
• formation contribution to total well production

From these results, the well's potential is calculated at a given bottomhole pressure and the scope for increasing production is evaluated.

The service also identifies and quantifies inflows from aquifers and behind-casing crossflow caused by a loss of cement-sheath integrity. This relies on integrated interpretation of the field data combined with temperature modeling.

PROLOG moves you from a general assessment of multilayer-well performance to an understanding of how each layer behaves. This makes it possible to select the most effective interventions, cut the cost of ineffective operations, and raise production by treating specific intervals.