New methods for the development of oil and gas fi ds with low-permeability reservoirs

Dmitry S. Klimov OGRI RAS Moscow
Ernest S. Zakirov OGRI RAS Moscow
The purpose of this article is to justify universal and multipurpose way of unconventional oil and gas fields development with low permeable rocks based on pressure maintaining and in-situ hydrogen and hydrocarbons synthesis revealed through the authors' lab experiments.
Materials and methods
The article presents brief summary of computer modeling results, obtained by means of commercial reservoir simulator tNavigator (Rock Flow Dynamics), and oil and gas fields development method in case of low permeable rocks, based on an previous laboratory experiments results analysis.
Presented simulation results correspond to a particular case and should not be absolutized at all. Obviously, feasible studies should comprise a large number of cases, but this was not the purpose of this paper. It is also clear that unpredictable effects could come. As far as in real reservoir conditions, layered or zonal heterogeneity often has negative impact on oilfield development indices. Nevertheless, on a qualitative level the results of simulating proves that proposed approach to oil fields development with low permeable layers can lead to increased values of oil recovery. The approach concerned to field development is realistic not only for oil, but also for gas condensate and, in some cases, gas deposits with low-permeability reservoirs.
Conducted laboratory studies and numerical experiments on sector model confirm enhanced efficiency of oil fields development in low-permeable reservoirs due to pressure maintenance by carbon dioxide injection in various modifications. The method described and technological solutions possess a number of important peculiarities and additional positive factors. Namely, firstly, pressure maintenance permit each producing well to get much oil. Incremental production may be several times higher thna the base case. Secondly, useful utilization of CO2 takes place, and according to laboratory experiments results additional generation of hydrogen and hydrocarbons occur as by-product of CO2 injection. Thirdly, practicality of the proposed method, similar to the technical and technological solutions that have long been implemented in oil and gas industry. And world-wide experience of carbon dioxide application in oil fields development confirms multi-purposedness, universality and abundance of its employment.
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low permeable reservoirs hydrogen generation