Developments Made in the Field of Drilling Fluids by Saint Petersburg Mining University

Abstract

The article discusses researches performed in the Well Drilling Department of the St. Petersburg Mining University. The directions of development of the department are shown. Special attention in this article is paid to research in the field of developing drilling fluids for drilling wells in various mining and geological conditions. It is shown that the gas-liquid mixtures studied by the department will be effective for under balanced drilling under conditions of abnormally low reservoir pressures when using a binary mixture of sodium lauryl sulfate 0.5% + linear sodium alkyl benzene sulfate 0.5% as a surfactant and polyacrylamide FP complex 107 (0.05%) as a forming and stabilizing additive + carboxymethyl starch BUR-2 (1%). Studies in the field of development of inhibitory fluids have shown that an increase in the concentration of polar compounds in the drilling fluid compared to their concentration in the rock Cp> Cn by 0.25 mol/L makes it possible to increase the stability of the rocks around the wellbore compared to the initial conditions. Studies of lubricating additives showed that introducing 1.5-2.0% of FRW additive reduces the friction coefficient of the metal-metal pair in a clay solution by 70-75% and in an aqueous solution up to 65%. The findings suggest that drilling fluids developed at the Well Drilling Department of the St. Petersburg Mining University have a high potential for their application in oil and gas fields in order to improve the efficiency of drilling and completion of wells. It is also noted that the scientific and technical potential of the department allows for input control of reagents in drilling fluids, as well as the development and research of various compositions not only for drilling and completion of wells, but also for development and repair, which are applicable in real field conditions.

Assessment the effect of skidding techniques on the ecological efficiency of the skidding tractor

“…In general, the reach of a boom in modern harvesting machines is up to 10 meters. Thus, their operating range, i.e., the areas between the skidding trails on which the machines can effectively use the boom, is almost 20 m. Similar conclusions are drawn by other researchers [11,18].…”

“…However, wider spacing would increase the cleaning costs. Frutig et al [18] found that a wider interval (optimum: 30-50 m) is advisable in the long-term perspective, as losses due to slower growth and less valuable wood are of great importance in calculating the entire turnover period. This conclusion coincides with the results obtained in this study.…”

Effects of Drilling Mud Properties on Hydrate Dissociation Around Wellbore during Drilling Operation in Hydrate Reservoir

“…Natural gas hydrates are ice-like crystalline that is formed by water and gas molecules at low temperature and high pressure [1][2][3]. Some investigations found that organic carbon stored in gas hydrates is about twice as much that in conventional fossil energy sources [2,[4][5][6].…”

Augmented Reality System and Maintenance of Oil Pumps

“…During maintenance, according to the actual state, some parameters are monitored, and on this basis, it is determined whether equipment repair is necessary or not. This method of maintenance is the most preferred because repairs are carried out only when necessary [8].…”