The work describes the implemented techniques which help optimize reservoir engineering for tight oil deposits with the usage of multi-stage hydraulic fracturing by up-to-date methods of fracturing values’ evaluation. The work also identifies reasons of high water cut of well production after the multi-stage hydraulic fracturing at the V. Vinogradov field. The work also describes principles of preparing and implementing the optimum design of the multi-stage hydraulic fracturing under the conditions of unconstrained growth of the vertical component of the hydraulic fracture without any restraining barriers. After the set of operations, the quality of hydraulic fracture control increased and the well production water cut reduced.
Международный университет природы, общества и человека «Дубна» В статье описана возможность применения трассерного метода для определения качества разработки нефтяных пластов. Исследования проводились для одного месторождения Среднего Поволжья. Результаты интерпретации данных трассерных исследований получены с применением специального программного обеспечения "ИНДИКАТОР".
As you know, most acid compositions intended for use in oil and gas production stimulation technology contain various surface-active agents (surfactants). During the filtration experiments the efficiency of surfactant-contained acid compositions is assessed by an increase of core permeability, which may be the result of two processes: dissolution of rock material and washing off the oil from porous medium surface. When both processes are at the same time, it is impossible to estimate the contribution of each of them. The express-method involves research on single cores. Only in case of the positive result of acid composition application regarding an increase of permeability and porosity of the core sample, you can proceed to the complete simulation on core samples with residual water or oil saturation. The filtration experiments are performed with a high pressure filtration unit and extracted core samples. The new approach is to replace a complicated research process of acid stimulation effect in order to select the most effective compositions, and the use of a simple study on a single water-saturated and oil-saturated core. This will reduce the work of testing acid compositions by eliminating the time-consuming research process on a stacked core model, as well as prevent from using the inefficient acid compositions in the field. In contrast to the experiments to determine the coefficient of oil displacement by water, as well as experiments to determine the curves of phase permeability, in which stacked core models are applied to avoid end effects, in this case a core material single-sample is used, since the main purpose of these experiments is to identify the impact of acid composition on the reservoir properties. Secondly, the feature of this method is the fact that allows you quickly and without additional expensive studies of the structure and composition of the core material, not only to select, but also to adapt the acid composition to the specific formation and porous medium conditions and characteristics. Thus, the further research is carried out only with the selected acid compositions excluding the rest of provided testing acids, saving a considerable amount of time and money.
Development of heterogeneous reservoirs is accompanied by fast increase of water-cut in producers caused by water break-trough by most permeable intervals and zones, and characterized by the poor sweep, production of large amounts of water and inefficient water injection. Development of heterogeneous reservoirs requires special approach to technology application. One of the solutions is implementation of in-depth sweep improvement technologies. Wide range of chemical reagents belonging to different classes of chemical compounds is used for well treatments. However, in general, polyacrylamide series synthetic organic polymers is used for conformance treatment, which possess a number of disadvantages, including short period of efficiency they are providing. New technology is aimed to solve this problem. Proposed to use innovative reagent – inorganic polymer. This reagent is complex composition of titanium and aluminum compounds, consisting of hydroxides, chlorides and oxide hydrochlorides of titanium and aluminum. Creation of hydrodynamic screens in high permeable and swept zones, is driven by mudding of channels by dispersed particles of titanium coagulant and coagulation products which are formed due to contact with formation and injected water. Gels formed by titanium coagulant belongs to inorganic polymers series and characterized, in comparison with the organic polymers, by stability over time and in high temperature environment. A distinguishing ability of the technology is ability to amplify hydrodynamic screen over time, which leads to increased efficiency and duration of barrier, due to volume increase of coagulation products induced by contact with injected water. A pilot project in West Siberia is currently underway. The world-wide commercial oil production has existed for over 150 years. These years have seen numerous scientific and engineering solutions implemented in oil fields, each having its own peculiar effect on oil industry development. Among them, however one should single out the unique technologies which turned out to be a prominent events in the world of oil. In fact, these are the "golden miles" the oil industry has walked, each mile being a landmark and a step to the next technological breakthrough. We do not dare identifying each and every "golden mile". Still one could hardly object when some of them would stand for the first well in the world drilled by a rotary method with a steam engine in Pennsylvania, or the first flooding ever and the first centrifugal pump that found application in the early 1900s in the USA, the first electrical well logging made in France, or the first horizontal well drilled in Azerbaijan, the first reservoir hydrofracturing performed in Oklahoma and Texas, and the first multilateral well built in Bashkiria (the USSR) [1 – 6]. Among the recent outstanding achievements, it is worth mentioning multizone reservoir hydrofracturing technology developed in the USA for oil and gas shales and successfully adapted by Russia to regular low-permeability reservoirs. The above list of the most significant engineering solutions in the oil industry may be even supplemented but the fact remains that most outstanding achievements were seen in the 20th century, and considering the complicated challenges set ahead the oil science by the current stage of oil industry development, the following question is becoming even more urgent: how will the today's generation of oil engineers will answer to arising challenges? what will the next "Golden mile" be?
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