Justification of a comprehensive technology for preventing the formation of asphalt-resin-paraffin deposits during the production of highlyparaffinic oil by electric submersible pumps from multiformation deposits

Abstract

Severe problems accompany the production of abnormal oils with high pour point (with a paraffin content of over 30% by weight) in Kraynego Severa, Russia, due to the intensive formation of asphalt-resin-paraffin deposits (ARPD) in the bottom hole zone of the productive formation and downhole equipment. Possessing many advantages, the existing methods and technologies for coping with ARPD cannot fully solve this problem. As a result, complications arising from the production of high-wax oils lead to a significant decrease in oil production, a reduction in the production wells' maintenance and intertreatment periods, and an increase in dewaxing unit operating costs. The obtained results of theoretical and laboratory studies show that one of the promising approaches to improve the efficiency of wells equipped with electric submersible pumps when exploitation of abnormal oils with high pour point from multilayer deposits of the Timan-Pechora oil and gas province is the use of the new integrated technology based on the joint production of abnormal oil with high pour point with the oil, characterized by a lower wax content and the manifestation of structural and mechanical properties, in conjunction with regulating the parameters of the electric submersible pump. In this paper, the authors also describe a promising scheme of downhole equipment for the simultaneous-separate production of high-wax oil from multilayer deposits. The proposed downhole equipment allows us to separate the perforation zones of two productive formations using a packer-anchor system during simultaneous-separate exploitation of the formations by a double electric submersible pump installation.

Barite-Free Muds for Drilling-in the Formations with Abnormally High Pressure

“…Potassium chloride is added to drilling fluids to stabilize water-sensitive clays through the inhibition created by potassium ions. Due to the inhibiting abilities of solutions that contain potassium chloride, clay hydration is reduced to a minimum, leading to a reduction in cavernosity, less sealing of the bit and stabilizer, less clay caving, and the preservation of reservoir properties [12,32,33]. Potassium chloride salt is used as the main source of potassium ions in the muds.…”

Influence of Asphaltenes on the Low-Sulphur Residual Marine Fuels’ Stability

“…Thus, obtaining LSFOs by selective compounding requires solving the problem of incompatibility arising when mixing the fuel components of paraffinic/naphthenic and asphaltene base [19,20]. As a result, marine fuel, as a multicomponent petroleum product, loses its sedimentation stability during storage and transportation and asphalt-resinousparaffin deposits (ARPDs) stratify, coagulate, and precipitate on pipelines and in storage tanks [21][22][23][24].…”

Use of the UNIFAC model in the calculation of physicochemical properties of ecotoxicants for technological and ecoanalytical purposes

“…Such a calculation itself would be a standard physicochemical problem if the researchers had exhaustive data on physicochemical properties of components. However, in practice the researchers face the lack of information about the system under consideration [40]. When preparing fuel for marine engines, fuel oil or other residual products of deep oil refining (oil tar, visbreaker tar) are often added to it.…”