EFFICIENCY ENHANCEMENT OF RESIDUAL OIL RESERVES RECOVERY FROM LOW-PRODUCTIVE RESERVOIRS USING GAS AND WATER-GAS IMPACT

2019 ◽  
pp. 59-64
Author(s):  
A.S. Valeev ◽  
◽  
Yu.A. Kotenev ◽  
A.Yu. Kotenev ◽  
V.Sh. Mukhametshin ◽  
...  
Keyword(s):  
Residual Oil ◽  
Efficiency Enhancement ◽  
Oil Reserves ◽  
Water Gas

Development of efficiency increase methods for water injection

2020 ◽  
pp. 57-60
Author(s):  
K.I. Mustafaev ◽  
◽  
◽  
Keyword(s):  
Water Injection ◽  
Cost Effective ◽  
Current Interest ◽  
Residual Oil ◽  
Production Well ◽  
Field Development ◽  
Oil Reserves ◽  
Production Wells ◽  
Efficiency Increase

The production of residual oil reserves in the fields being in a long-term exploitation is of current interest. The extraction of residual oil in such fields was cost-effective and simple technological process and is always hot topic for researchers. Oil wells become flooded in the course of time. The appearance of water shows in production wells in the field development and operation is basically negative occurrence and requires severe control. Namely for this reason, the studies were oriented, foremost, to the prevention of water shows in production well and the elimination of its complications as well. The paper discusses the ways of reflux efficiency increase during long-term exploitation and at the final stages of development to prevent the irrigation and water use in production wells.

scholarly journals The influence of geological and technological factors on the probability of determining zones of residual oil reserves

2019 ◽  
pp. 46-56
Author(s):  
E. S. Azarov
Keyword(s):  
Correlation Coefficient ◽  
Residual Oil ◽  
Technological Parameters ◽  
2D Modeling ◽  
Technological Factors ◽  
Oil Reserves ◽  
Probability Map ◽  
Probability Maps ◽  
Final Probability ◽  
High Degree

This article is devoted to the probability maps have been constructed for predicting the zones of residual oil reserves using the example of deposits in Shaim region. The refinement of the previously presented algorithm [4] has been made, which helps with a fairly high degree of probability to quickly localize the residual oil reserves based on 2D modeling. In the process of work, the influence of many geological and technological parameters on the final probability map was established, the influence of the observation zone on the value of the correlation coefficient of the map of residual mobile oil reserves with the map of current mobile oil reserves based on geological and hydrodynamic modeling was established.

Classification of residual oil reserves and methods of its recovery

2021 ◽  
pp. 26-33
Author(s):  
D.Yu. Chudinova ◽  
◽  
Y.D.B. Atse ◽  
R.M. Minniakhmetova ◽  
M.Yu. Kotenev ◽  
...  
Keyword(s):  
Late Stage ◽  
Oil And Gas ◽  
Residual Oil ◽  
Oil Reserves ◽  
Oil And Gas Fields ◽  
Stage Of Development ◽  
Distribution Studies ◽  
Water Cut ◽  
Gas Fields ◽  
Technical Measures

Many oil and gas fields are currently at a late stage of development, while most of them are being developed using flooding. These fields are characterized by the decreasing oil and liquid flow rates and accelerating water-cut. During the development process, the majority of oil reserves are extracted not using methods of production enhancement. Though, oil reserves within undeveloped areas are a valuable source for recovery. To involve residual reserves in active development, it is necessary to make a reasonable justification and a choice of the most effective geological and technical measures that take into account various geological field and well reservoir characteristics. Residual oil reserves at the late stage of development are classified as hard-to-recover and are mainly concentrated in areas not covered by flooding laterally and vertically. They belong to various categories that differ in the geological and technological characteristics. In this regard, it is necessary to plan various geological and technical measures taking into account the structure of residual reserves and patterns of their distribution. Studies of complex oil and gas fields were performed and a detailed analysis of the geological and physical characteristics, parameters of reservoir heterogeneity along with operational, geological and commercial assessment of reserves development were conducted.

scholarly journals IDENTIFICATION OF INHOMOGENEOUS LAYERS AND RESERVOIR LENSES IN TERRIGENOUS DEPOSITS

Neft i gaz ◽  
2020 ◽  
Vol 1 (121) ◽  
pp. 25-39
Author(s):  
S.P. NOVIKOVA ◽  
◽  
S.V. SIDOROV ◽  
Z.M. RIZVANOVA ◽  
I.Z. FARXUTDINIV ◽  
...  
Keyword(s):  
Structural Factor ◽  
Upper Devonian ◽  
Residual Oil ◽  
Reservoir Properties ◽  
Systematic Analysis ◽  
Oil Saturation ◽  
Oil Reserves ◽  
Frasnian Stage ◽  
Net To Gross ◽  
Bypassed Oil

The possibilities of localizing residual oil reserves in depleted deposits of Tatarstan oilfield analyze in the article. The object of the study is the Pashian deposits of the Frasnian stage, Upper Devonian of the Almetyevskaya area, Romashkino oilfield. Possibilities of bypassed oil searching are considered. Sedimentation and heterogeneity of strata in the terrigenous Devonian sediments within the study area are analyzed in the paper. The analysis was carried out on the basis of well logging data. A detailed correlation of strata has been carried out, and members have been identified according to the rhythm of the layers’ occurrence in the Pashian horizon. The distribution of reservoirs and seals was studied based on the results of the detailed correlation. The analysis is based on a systematic analysis of the research object, which made it possible to consider the problem from different sides. The analysis of structural surfaces, maps of total and oil-saturated thicknesses, porosity, oil saturation, net-to-gross content and dissection along the upper and lower Pashian deposits was carried out. The influence of the structural factor on the reservoir properties of the formations is analyzed. The analysis made it possible to assess the heterogeneity of reservoirs in area and section and to predict the bypassed oil reserves localization.

scholarly journals Analysis of the directions for improving the development systems for oil fields at the later stage

2021 ◽  
Vol 1 (1(57)) ◽  
pp. 34-38
Author(s):  
Volodymyr Doroshenko ◽  
Oleksandr Titlov
Keyword(s):  
Late Stage ◽  
Water Movement ◽  
Oil Fields ◽  
Flow Profile ◽  
Residual Oil ◽  
Oil Reserves ◽  
Production Wells ◽  
Design Value ◽  
Oil Productivity ◽  
Water Cut

The object of research is oil fields at a late stage of their development. The most problematic issues in the development of oil fields are the formation and withdrawal of residual oil reserves. This problem is especially acute at the late or final stage, when the oil productivity of the wells decreases and the water cut of the production catastrophically increases. The most acceptable development system in such conditions is the use of methods for increasing oil recovery and, first of all, by injecting water into the reservoir. At the same time, the problematic issue is the lack of reliable information on the paths of water movement from injection to production wells and the imperfection of methods for aligning the injectivity profile in injection wells and the flow profile in production wells. In the course of the study, statistically analytical methods were used to analyze the state of development of oil fields at a late stage and industrial approbation of methods for tracing water movement and substantiation of a reagent base to align the paths of water movement and oil inflow. A set of reagents and technological methods for ensuring the regulation of the process of flooding of oil fields at a late stage of their development have been investigated and developed. It has been proven that a promising direction is the injection of a 0.1 % aqueous solution of the Polycar polymer together with water. This solution first of all penetrates into highly permeable, water-washed, formation intervals, contributing to the leveling of the injectivity profile, reducing the water cut of surrounding production wells and increasing their oil productivity. Thanks to the research carried out, directions and means of improving the systems of field development at a later stage have been developed by organizing targeted (selective) waterflooding of oil deposits based on high-quality and comprehensive control of the movement of filtration flows in the reservoir. This will ultimately contribute to achieving and maintaining the design value of reservoir pressure, preventing a decrease in the rate of decline in oil production, obtaining the design value of the sweep efficiency by waterflooding, and withdrawing residual oil reserves.

A Tool and Mathematical Model for Estimation of Wells Initial Water-Cut and Residual Oil Reserves on Large-Sized Oil Fields

2021 ◽  
Author(s):  
Vladimir Berezkin ◽  
Anar Sharifov ◽  
Elena Khatmullina ◽  
Evgeniy Yudin ◽  
Ildus Khatmullin
Keyword(s):  
Mathematical Model ◽  
Oil Fields ◽  
Accurate Estimation ◽  
Residual Oil ◽  
Initial Water ◽  
Oil Saturation ◽  
Oil Reserves ◽  
Production Forecasting ◽  
Intervention Planning ◽  
Water Cut

Abstract Oil production forecasting and well intervention planning require an accurate estimation of the remaining oil in place (ROIP). The problem of ROIP maps generation can be solved using commercial software; however, in the case of large fields, this requires significant computing resources and takes a big amount of time to prepare and adapt the data. Mathematical models for getting a quick solution to these issues have not been sufficiently elaborated. In this work a physical and mathematical model is proposed for building ROIP, oil saturation and water cut maps. The model was used to develop a tool for well stock managing, new wells drilling planning and detection of behind casing fluid flow by comparing the actual water cut of the well with the calculated water cut map.

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