Study of the Rheological Characteristics of Sediment-Gelling Compositions for Limiting Water Inflows

Abstract

In view of the poor knowledge of the applicability of sediment-gelling compositions (SGCs) in waterproofing the bottom-hole zone of wells, work in this area of research is one of the most promising in waterproofing today. The key goal of this work is to study the prospect of using SGCs for waterproofing as well as to calculate the rheological characteristics of the proposed SGCs depending on variations in the components of their composition (alkali and polymer). In the course of our studies, it was found that the key factors influencing the rheological characteristics of SGCs are not only the variation in the ratio in the composition of alkali and polymer but also the degree of salinity of the formation water, which must be taken into account when developing waterproofing. During this research, it was found that due to the absence of calcium and magnesium ions in fresh water, the proposed polymers have good solubility (the exponent in the rheological model is equal to or close to unity), which leads to an increase in the viscosity of solutions. The dependence of changes in the rheological constants of SGCs on such parameters as temperature and alkali concentration have been established. It was determined that an increase in the solution temperature leads to an increase in the rheological constant n from 0.8 to 0.92 (at a polymer concentration of 0.05 and a NaOH concentration of 0.1), while a variation in the NaOH alkali concentration from 0.1 to 0.75 leads to similar changes in one measured temperature range. The results obtained can be used in the future to evaluate the use of SGCs to create barrier waterproofing in the bottom-hole zone of wells during oil production.

Theoretical Justification of the Thermal Method – Steam Cyclic Treatment of Wells of the X Deposit

“…In addition, this method of treating the bottomhole zone promotes the active dissolution of paraffin-resinous deposits, loosening of sludge deposits and the elimination of water barriers. As a result, the oil permeability of the reservoir is not only restored, but often becomes higher than at the beginning of the well's operation [5]. After treatment, the surface of the pore channels is lyophobized (covered with a film of hot condensate), which, combined with long-term preservation of elevated temperature in the reservoir, greatly slows down the mechanism of re-accumulation of paraffin-resinous deposits.…”

Forecasting Orf by the Martos Method and the Statistical Method Using the Example of Deposit X

“…Wells №№14 and 29, after opening the salt strata with a thickness of 874 m and 1042 m, respectively, passed about 1000 m through Permian-Triassic terrigenous deposits. According to well logging data [5][6][7], sandstones are almost completely absent in the sub-canopy part of the interval and the prospects for discovering deposits here are very low. T-V).…”

“…Analysis of core studies. Basic information about the nature of illumination from core material and laboratory analyzes of the productive strata was obtained during exploratory drilling in 21 wells (№№1, 2, 3,5,6,7,10,11,13,14,19,20,21,22,23,24,25,36,37,38,40).…”

Study of the Dynamics of Associated Drill Strings Interacting With the Well Wall

“…Despite the use of electronic equipment, in most cases drilling remains primarily a mechanical process. The strength and static stability of the structure are necessarily studied I БУРЕНИЕ when designing an installation, however, it is almost impossible to predict in advance and completely the dynamic behavior of the system due to the large number of operating factors, which can only be taken into account approximately [4]. Extensive literature is devoted to torsional vibrations of the drill string.…”