The article discusses the reasons for the occurrence of asphaltene-resin-paraffin deposits in production tubings and pipelines, the ways to eliminate the issues, and a novel reagent based on the aromatic solvents and modifiers (copolymer of polyethylene polyamine, ethylene oxide and propylene oxide based on glycerin) developed to solve the issue. The efficacy of the newly developed XL-6 reagent against asphaltene-resin-asphaltene deposits was determined, and the effect on non-Newtonian oil rheology was investigated. The efficiency of the developed new XL-6 reagent against asphaltene-resin-paraffin deposits was studied in a comparative manner with the СНПХ-2005 reagent in the consumption interval of 50–450 g/t on the oils taken from the wells No. 2153 and 2364 of Neft Dashlari OGED (Oil-Gas Extraction Department). It has been established that XL-6 reagent at consumption of 300–350 g/t shows high efficiency against ARPD. The effectiveness of XL-6 reagent on the rheology of the studied oil at a flow rate of 300 g/t was studied. The studies were also carried out in comparison with the СНПХ -2005 reagent and crude oil.
A b s t r a c tFlooding is presently the most-commonly used EOR method. However, in fields with complicated geological structure and high-viscosity oil this method does not always produce the expected result. On the other hand, worker agents injected into the formation for residual oil displacement, moving along highly permeable sections penetrate the producer wells. This leads to premature flooding and low permeability oil-bearing zones remain aloof from development. This article presents test results obtained under laboratory conditions for air displacement, gas-water drive, surfactant solution with gas displacement through homogeneous and heterogeneous porous media under different attitude of bed. Experimental studies are aimed at maximum penetration of the working agent injected both in high permeability and low permeability zones for enhanced extraction of residual oil.
The paper presents the results of laboratory investigations on the development of lightweighted cement compositions for improvement of stabilizing of producing formation, as well as the hermetization of the areas with low frac gradients. To obtain lightweighted cement, few optimum compositions have been specified through experiments adding the agents in various thickness and concentrations into the mixture. The distribution of optimum compositions, the beginning and end of the hermetization, the solidness and density have been defined. The density of cement slurry developed on cement+seawater is 1900 kg/m3, the density of that on the cement+seawater+chamotte+bark+polymer+CaCl2 is 1610 kg/m3, the density of one developed on the cement+seawater+bark+CaCl2+carbonate+Al powder is 1700 kg/m3 and the density of cement slurry on cement+seawater+bark+CaCl2+keramzit comprised 1590 kg/m3.
The paper presents the results of theoretic, laboratory-experimental and field studies associated with using express-method for the definition of the direction of water flow pumped into the injection wells. According to the results of carried out calculations, the current distribution of injected water in selected part of the series in “Neft Dashlary” (X horizon) field has been visualized. The accuracy of the calculations has been justified via comparison of obtained results to those of the tracer study conducted in field conditions at the same time. New tracer indicative material has been tested during the tracer studies. According to the laboratory- experimental research carried out, the optimum amount of indicative substance added to the injected water for the identification in well production has been specified. The saving by using the calculation method in selected area of “Neft Dashlary” field is equal to 62.9 thousands AZN.
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