Lukoil Abandons Tub-Karagan Well in the Caspian Sea

The first exploration well was abandoned at the Tub-Karagan block located in the central part of Kazakhstan's sector of the Caspian Sea.

Tub-Karagan Operating Company B.V., the Operator of the contract area, was founded by KazMunaiTeniz (50%) and LUKOIL Overseas (50%). All costs incurred during the exploration period of this project until the commercial discovery are to be borne by the Russian party.

The first exploration well with total depth of 2,500 m was drilled from the Astra jackup, with LUKOIL-Shelf of Astrakhan being the drilling contractor. The drilling was started on April 30, 2005. The objective of the work was to study the structural cross-section, identify and appraise hydrocarbon deposits.

The well was drilled in full compliance with the engineering design under continuous geological and engineering control. During the course of the work a riser was installed and intermediate casing strings were run and cemented. A full suite of planed geological and geophysical logs through the section penetrated by the well was performed, as well as the geological and geochemical analysis of core samples, formation fluid samples and drilling cuttings. All operations were performed on the basis of the zero discharge principle and in compliance with all environmental norms.

According to the description of the core samples, the well intersected tectonic faults. The lead selected for exploration for oil and gas is characterized by high tectonic activity (compartmentalization). It is assumed that the tectonic environment did not allow the hydrocarbon traps to form, resulting in their destruction. Based on the results of the studies, the well log did not demonstrate any oil and gas bearing reservoirs and targets of commercial value.

The exploration well reached target depth and provided detailed data on the geological structure of the cross-section and a large amount of materials (core samples, drill cuttings, formation fluids) for studies. The well achieved its geological objective and was abandoned in full compliance with the technical requirements specified for this category of wells.

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