«Onshore and offshore oil and gas well construction»

Technological approaches to the drilling fluid selection for the primary opening of Vendian terrigenous sediments in the south of the Siberian platform

UDC: 622.24.063.2
DOI: -

Authors:

¹ Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
² Irkutsk National Research Technical University, Irkutsk, Russia
³ RN-Burenie, Irkutsk, Russia

Keywords: initial opening, terrigenous deposits, asbestos, marble chips, asbestos-polymer drilling fluid

Annotation:

Initial opening when drilling productive horizons is one of the most important tasks in the well construction cycle; the subsequent efficiency of hydrocarbon production, namely flow rate and operational life-time, depends on it. When drilling, various systems of drilling fluids are used, the properties of which are selected based on definite geological conditions. The purpose of these systems is the skin effect minimization by reducing their impact on the productive formation. There are many types of drilling fluids, which are divided into two main ones: hydrocarbon-based fluids and water-based fluids. Each of them has a different impact on the degree of reservoir properties deterioration. One of the factors that negatively impacts the productive formation is the depth of penetration of the drilling fluid filtrate into the pore space. This process can be minimized through the use of micro-clogging additives, which reduce the release of filtrate by drilling fluid. A careful selection of the bridging additive type can maximally minimize filtrate production and form a thin filtration cake, which can be removed from the pore space of the productive formation during further development of the well. The existing drilling fluid systems are reviewed. The use of asbestos-polymer drilling fluid was laboratory studied. The result of the study was the assessment of the degree of the proposed solutions influence on the quality of the initial opening of productive formations of the Vendian terrigenous deposits.

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