Sonatrach

About: Sonatrach is a company organization based out in Algiers, Algeria. It is known for research contribution in the topics: Hydraulic fracturing & Structural basin. The organization has 460 authors who have published 494 publications receiving 6339 citations. The organization is also known as: Sonatrach SPA.

Investigation of the impact of weighting particles on drilling mud rheology and damage to reservoir formation

Abstract: The effect of calcium carbonate on drilling fluid densities after damage to the reservoir during the liquid flow was considered in the present paper. To test the initial / final permeability and fluid flow rate as well as the damage ratio, the damage tests have been completed and several Binghamian drilling formulation that were carefully prepared in the laboratory are used. Based on the obtained results, there is a minimal quantity of surfactant and the DR significantly changes beyond this limit. The drilling fluids containing 3\% of calcium carbonate and 2-3 % of the emulsifiers and wetting agent show a high flow pressure and display an immense damage ratio of about 43%. It is also that these drilling fluids containing calcium carbonates provide the rheological properties close to those used in the field level. Such drilling fluids are stable over time, giving the yield stress beteween 5-10 Pa to allow the fluid flow.

EFFET DU TAUX DE DEFORMATION SUR LES PROPRIETES MECANIQUES ET STRUCTURALES LORS DU RECUIT DE RECRISTALLISATION DE L’ALLIAGE Cu-4,6At.%In THE EFFECT OF THE DEFORMATION RATE ON THE MECHANICS AND STRUCTURAL PROPERTIES DURING RECRYSTALLIZATION OF ALLOY Cu-4,6

Abstract: Ce travail a pour but de mettre en evidence l’effet du taux de deformation sur l’evolution des proprietes mecaniques et structurales de l’alliage Cu-4,6 at-.%In, homogeneise et trempe ensuite deforme par laminage a froid et recuit a une temperature de 550°c. La microscopie optique et la microdurete Vickers sont les principales techniques d’analyse utilisees pour le suivi de l’evolution structurale et celle des proprietes mecaniques au cours des differents stades du recuit. Les resultats obtenus confirment d’une part l’influence notable du taux de deformation sur la taille des grains recristallises et d’autre part conditionnent la formation de nouveaux grains par un taux critique de deformation avoisinant 10%. The aim of this paper is to clarify the effect of the deformation rate on the evolution of the mechanic and structural properties of alloy Cu-4,6 at.%In homogenized, quensched, then deformed by cold lamination and cooked at a temperature of 550°C. The optical microscopy and microhardness Vickers are the stricking methods of analyis used for the follow ap of the structural evolution and those of mechanic properties during the different stages of cooking. The obtained results confirm from on side the notable influence of the deformation rate on the size of the recrystallised grains and from another side it will condition make ready the formation of grains again by a critical rate of deformation around 10%.

Field test investigation of the performance of corrosion inhibitors: a case study

Abstract: Corrosion is considered one of the major problems that affect flow assurance during hydrocarbon production. This irreversible phenomenon has the ability to cause serious material failure in the oil and gas industry. Consequently, heavy capital and operational costs are required to prevent corrosion processes. Sweet corrosion of raw gas production facilities in an Algerian gas field manifests inside surface installations, which leads to gas production interruption and high intervention costs. To mitigate this type of corrosion, many methods can be applied such as the selection of appropriate materials, the injection of inhibitors, and the use of protective coating. In this work, the main points of gas production system that have been affected by corrosion and the inspection techniques used in the studied field were reviewed. Moreover, the efficiency of two types of two corrosion inhibitors (film-forming/neutralizing and film-forming chemicals) was studied by measuring the corrosion rate in the field and conducting chemical analyses on the produced water samples in the laboratory. The results of laboratory analyses regarding pH and iron content measurement point out that the injection of film-forming/neutralizing chemical significantly shifted the pH of the medium from acid to more neutral value and decreased the iron content, while the injection of film-forming inhibitor affected only the iron content by decreasing its tenor in the water samples. These results confirm the functions of each inhibitor to protect metal against internal corrosion. The comparison between the single- and double-function inhibitors reveals that the film-forming inhibitor (CK981DZ) outperforms the film-forming/ neutralizing chemical with an efficiency that exceeds 99% at low injection rate. Moreover, it provides good compatibility and stability all through its injection path. Meanwhile, the application of double function inhibitor (film-forming/neutralizing) significantly reduced the corrosion rate of carbon steel structures, but it involved the formation of deposits in the gas processing plant. The findings from this study can help give a better understanding of the methodology of corrosion inhibitor performance evaluation in real condition of gas production, also the criteria of inhibitor screening based on laboratory and field tests.

Sequence Stratigraphy of the Cambrian and Ordovician Series in the Illizi Basin (Algeria)

Abstract: The Cambro–Ordovician sediments of the Southeast Saharan Platform show a facies evolution from continent to platform rather than from platform to basin and, for that reason, faciological stratigraphy (Homewood et al. 1992) has been applied. The genetic sequences are limited at their bases and tops by Maximum Flooding Surfaces (MFSs). These surfaces mark the transition between retrogradation and progradation, and are the best isochronous surfaces and easy to identify. The “Infra Tassilian Surface” or “Pan-African Surface” marking the contact between the basement and the sedimentary facies is flat and no alteration horizon is visible. The sediments are anisometric and clean, with conglomerates containing rounded gravel and sandy quartz grains. Kazi Tani (2000) considered the contact to be a marine abrasion surface. Evidence exists for eight third-order cycles, and the key surfaces (MFSs) that define them have been dated using biostratigraphy. Correlations have been made between the Tassilis outcrop series and wells. New oil stratigraphic traps and argillaceous seal rocks have been found. In this study, it was discovered that the marine flooding surfaces present two important characteristics in the formation of the stratigraphic traps: the formation of pinch-out reservoirs, and the very widespread, impermeable argillaceous facies constituting the cover of the traps. Therefore, the MFSs are presented as a new feature to be considered in the exploration for oil in this region.