Oil & Gas Well Testing & Fracking

Compare old days drill-stem tests with modern practice in North Africa’s tight gas and tight oil reservoirs, noting Ordovician and Devonian formations and back-pressure strategies in 1958–1964 and 1986 tests.

Shows a closed GST and DST configuration with drill pipe or tubing, a pressure recorder, and an open hole packer isolating the formation, highlighting residual mud and idle GOP practice.

Analyze the 1986 well test data set with short flow durations, tracing phases from initial hydrostatic pressure and packer setting to brief preopening, build-ups, drawdowns, and final pressure after removal.

An archaeology of decades of dst data reconstructs the real alpha-5 profile, showing initial hydrostatic pressure, packer isolation, drawdown, build-up, and convergence toward the reservoir virgin pressure.

In an old type DST, no reservoir pressure and a tight formation produce large drawdown; short preflush and mud cake clogging hinder stabilization, causing underestimated mobility.

Identify secondary sources of uncertainty in a real DST case study, including old Amerada gauges, modern sapphire and quartz gauges, and short flow periods biasing permeability and pressure estimates.

Explore how tight gas formations influence supercharge effects, near wellbore pressure during overbalanced drilling, and how drawdown timing affects accurate reservoir pressure estimates.

Examine hydraulic fracturing in an analogue field and its limits for the main field. Note Ordovician formations are tighter than Devonian, with Ordovician Gray porosity 6–9% and permeability around 0.01.

Analyzes hydraulic fracturing and its impact on well performance, comparing open flow potentials from Prosper's software and Kepa, and noting a 50 bar rise in wellhead pressure.

Analyze pre and post fracking data amid missing pressure information. Compare wellhead pressure shifts and gas and condensate rates across wells.

Analyzes processed well data to distinguish skin effects from fluid and completion factors, and compares Alpha and track field drawdown drivers like nutcake and retrograde condensation.

Evaluate the relevance of analogies using three axes: geology, fluid composition, and operations, and show why the field is not a good analog for driving fracking in the Alpha field.