Mürəkkəb-reoloji neftlərin quyudibi zonada süzülməsinin və nasos-kompressor borularında hərəkətinin təhlili və tədqiqi

Solution method

The discussed topic is related to the problems caused by asphaltene-resin-paraffin sediments (APS) in the process of using heavy oils, the negative effects of these problems on operating conditions, and the use of effective reagents to solve the problem. Although steps have been taken to solve this problem in the republic for a long time, the complete elimination of the problem and an effective solution have not yet been developed. Therefore, in order to solve this complex problem, it is necessary to carry out a complete analysis of the results of the solution-oriented scientific-research works conducted in other oil-producing regions. Asphaltene-tar paraffin sediments settle in oil field equipment and in the well bottom zone, complicating both the exploitation process and reducing the permeability of the well bottom zone, leading to the weakening of productivity. If this deposition process continues over a long period of time, it leads to malfunction, failure and corrosion of oilfield equipment. Therefore, finding an effective solution to the problem is aimed at protecting the productivity by eliminating the slowdown of the exploitation process. The main reason why this problem caused by AQPC has not been fully resolved so far is the lack of knowledge of the conditions and how they are formed in the oil field equipment, and the lack of complete study of the chemical composition of these sediments. In recent times, there have been several studies and proposals by scientists to study the cause of AQPCI formation in the well bottom zone and oil field equipment.[4]
In our republic, the most difficulties arise in the operation of marine oil equipment. Thus, according to N.N. Khumbatov, oil spills occur in output lines throughout the year. However, most of the deposition of paraffin occurs in the autumn-winter months and in cases where the temperature limits of sea water are 4-7 degrees. The scientific and experimental research results revealed by V.P. Tronov prove that the reason for the formation of paraffin inside the oil is the combination of paraffin particles in the nave. But later V.D. Kuznetsov , V.P.Trunov themselves rejected this idea in their experience. For example, V.V.Ragulin, E.F.Samolyanes and others note that one of the main reasons for the occurrence of ACPs in oilfield equipment is the separation of gas from oil due to the pressure drop below the saturation limit. Along with the separation of the quickly evaporating hydrocarbon group from the oil phase, the dissolution rate of its high-molecular paraffin crystals decreases. This idea is currently defended by a number of researchers abroad, for example, L.K.K. Marques, A.L.K. Makado and others. one of the known methods is acid treatment of the well bottom zone. However, after applying it in many wells, it was found that this method did not give the desired results. The main reason for this method not giving enough effect is that the chemical composition of the applied acid-containing reagent cannot dissolve the AQPC.
In order to solve the problem in Azerbaijan's onshore oil fields, it was aimed to restore the natural permeability of the well-bottom zone and rocks by influencing the well-bottom zone with thermochemical and thermo-acidic methods. A good result can be obtained by dividing the method of dealing with the problem into 3 parts:

1. Technology of cleaning asphaltene-tar-paraffin sediments from the bottom zone

2. Technology that prevents the formation of deposits in oilfield equipment
3. Cleaning technology of AQPCH formed in oil field equipment

Experiments show that the reagents used against ACP are not considered appropriate if their effectiveness percentage is 30% or less. The effectiveness of the reagents should be in the range of 55-75% so that they are able to eliminate these sediments. I would like to note that the "MORE-R" reagent, newly developed at the "Scientific-Research Institute of Oil, Gas and Chemical Research Institute" against paraffin precipitation, has passed the test stage in the well No. 2576 in the field of the Oilstones NQCI. As a result, the effectiveness of the reagent has been checked and its application considered useful. In addition, "MORE-R" reagent was tested in laboratory conditions and the solubility of the reagent was proven. Therefore, I suggest to use "MORE-R" reagent as an effective reagent against paraffin precipitation.[5]

4. 
   Results
   

Summarizing the results of the conducted laboratory experiments, the following results were obtained:
1. The restoration of the initial percolation rate of oil in the porous medium depends on the composition of the applied composition.
2. Depending on the ratio of the components in the composition, the rate of oil percolation practically recovers and takes the initial value after 2.5 pore volumes of oil pass through the composition. That is, by cleaning the bottom zone with the proposed composition, its permeability increases, and the production of the well is very close to the initial production.
3. Due to the effect of the prepared composition, clay particles in layer conditions reduce their volume up to 10%.

5.