Search

Field data are requisite in order to set up a realistic reservoir model capable of predicting the dynamic field behavior during the development stage of an oilfield. Well testing is considered as one of the most useful methods for obtaining reservoir and wellbore data. Numerous analytical models are utilized in analyzing vertical-well pressure transient tests, however, horizontal-well transient tests analysis has been considered as a more difficult undertaking. In this article, well test data of a horizontal well are simulated for homogeneous isotropic and anisotropic reservoirs. The data are later used in order to develop an empirical correlation that ratifies the vertical reservoir permeability estimated by well testing.

The complexity of wells being drilled has increased over the past few years in order to fulfill the worldwide increase in energy demand. The existing drilling technologies make it possible to construct boreholes with different directions. However, the control of paths and trajectories within the operator requirement is a non-obvious task, because of the data transmission time and the space discretization for measurements. This article aims at reviewing the most common techniques of curvature measurements and data transmission. It also compares them by outlining their advantages and weaknesses.

A comparative study is performed to elucidate the understanding of thermally and chemically assisted gas-oil gravity drainage mechanisms in the fractured carbonate Qarn Alam oilfield. The idea was to lay plans to devise an experimental apparatus that will be used to simulate the recovery mechanisms. The set-up will also be utilized to confirm that chemically-assisted thermal recovery mechanisms in fractured reservoirs are consistent with simulation predictions.

In this article, polyurethanes have been selected as potential lost circulation materials (LCMs) that will be introduced in wellbores having experienced serious drilling mud losses. The chemicals will be mixed at surface, pumped downhole, let to bridge/foam and seal open fractures/channels. Different tests have been carried out to investigate better ways of mixing and handling polyurethanes before pumping. In that, prospects of slowing down polyurethane reactions by decreasing the amount of activator and adding different proportions of diesel were investigated. Testing the effect of moisture on polyurethanes also was tested. Furthermore, testing using diesel, toluene, xylene, Musol, acetone, glycol, light crude oil, Safrasol as carrier fluids was undertaken. The mixing sequence of diluents and polyurethanes also was thought of and the effect of mixing water on foaming reaction also was investigated. Placement under pressure of pumped polyurethanes also was investigated. It was revealed that pressure enhan...