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ANALYSIS OF THE PROBABILITY OF THE INITIATION OF CONDITIONS FOR OIL, GAS AND FORMATION WATER INTERPLASTIC FLOWS ALONG THE ANNULAR SPACE OF WELL BORES

Rinat Atlasov, Ewaldt Tugi, Maria Nikolaeva, Revo Skryabin

Abstract

In nature simultaneous manifestation of several processes takes place: diffusion and filtration of hydrocarbons, their emergence, overflows along tectonic fractures, etc. Other things being equal, the dispersion of gas accumulations occurs much faster than oil accumulation, due to greater mobility (migration ability) gases, better solubility in water, higher diffusion capacity, etc. All these natural processes that can lead to the redistribution or destruction of oil and gas accumulations take place mainly over a long period of time during the development of geological history. Serious danger to the safety of industrial accumulations of hydrocarbons is the flow of oil, gas and reservoir water through the boreholes of open fields, especially if these deposits are in a long-term conservation after active reconnaissance. Underground flows of hydrocarbons and reservoir waters lead to the loss of hydrocarbon raw materials, complicate the development of deposits, make it difficult to control the formation of seams and exacerbate the ecological situation. Ultimately all of this leads to a decrease in the efficiency of field development and a reduction in the amount of hydrocarbons recovered from the bowels. The thermodynamic conditions of hydrocarbon deposits in the oil and gas bearing areas under consideration are predetermined by the insulating properties of the fluid controllers that control the productive deposits, ensuring their safety with a certain degree of reliability. The prevailing opinion is that the separation of layers in the wells by lowering the casing strings and their cementing allows restoring the impermeability of the disturbed fluids. However the separation of layers in the drilled wells does not ensure the restoration of the tightness of the fluids in full. Consequently, each well can be considered as a potential source of channels of formation fluids interplastic flows initiation, leading to the formation of secondary (technogenic) oil and gas deposits, loss of reservoir energy, flooding of productive layers, irretrievable loss of oil and gas.

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