scholarly journals Experimental Investigation on Injection and Production Pattern in Fractured-Vuggy Carbonate Reservoirs

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 603
Author(s):  
Juan He ◽  
Aowei Li ◽  
Shanshan Wu ◽  
Ruixue Tang ◽  
Dongliang Lv ◽  
...  
Keyword(s):  
Production Management ◽  
Flow Channel ◽  
Water Flooding ◽  
Production Well ◽  
New Production ◽  
Injection Wells ◽  
Gravity Segregation ◽  
Production Wells ◽  
Oil Water ◽  
Production Pattern

To constitute and adjust the injection and production pattern in fractured-vuggy reservoirs, we extracted twelve fractured-cave structures, fabricated them into physical models with acrylic plates, and performed experiments via these models. The results show that utilizing oil/water gravity segregation sufficiently and forming valid flow channels should be emphasized. Preferentially exploiting the reservoir body containing intermediate-scaled or large-scaled caves, arranging injection wells in fractures or small-scaled caves while placing production wells in large-scaled caves, and separately putting injection wells and production wells in low/high parts of an intermediate-scaled or large-scaled cave, were found to benefit oil/water gravity segregation and thus gain a better water flooding effect in these experiments. Experiments with combined models also figured out that, after adjusting the injection and production pattern, the valid flow channel newly formed must pass through caves containing enough residual oil to improve the water flooding effect and could be obtained by shutting down the old production well while adding a new production well, adding a new production well, or switching the production well into an injection well while adding a new production well. In the actual field, adjusting the well location and altering the flow channel were proposed to conduct together. This study may provide references on the production management of analogous reservoirs.

scholarly journals Viral Abundance and Diversity of Production Fluids in Oil Reservoirs

2020 ◽  
Vol 8 (9) ◽  
pp. 1429
Author(s):  
Liangcan Zheng ◽  
Xiaolong Liang ◽  
Rongjiu Shi ◽  
Ping Li ◽  
Jinyi Zhao ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Community Dynamics ◽  
Diversity Index ◽  
Microbial Evolution ◽  
Water Flooding ◽  
Epifluorescence Microscopy ◽  
Production Well ◽  
Viral Abundance ◽  
Production Wells ◽  
Microbial Flooding

Viruses are widely distributed in various ecosystems and have important impacts on microbial evolution, community structure and function and nutrient cycling in the environment. Viral abundance, diversity and distribution are important for a better understanding of ecosystem functioning and have often been investigated in marine, soil, and other environments. Though microbes have proven useful in oil recovery under extreme conditions, little is known about virus community dynamics in such systems. In this study, injection water and production fluids were sampled in two blocks of the Daqing oilfield limited company where water flooding and microbial flooding were continuously used to improve oil recovery. Virus-like particles (VLPs) and bacteria in these samples were extracted and enumerated with epifluorescence microscopy, and viromes of these samples were also sequenced with Illumina Hiseq PE150. The results showed that a large number of viruses existed in the oil reservoir, and VLPs abundance of production wells was 3.9 ± 0.7 × 108 mL−1 and virus to bacteria ratio (VBR) was 6.6 ± 1.1 during water flooding. Compared with water flooding, the production wells of microbial flooding had relative lower VLPs abundance (3.3 ± 0.3 × 108 mL−1) but higher VBR (7.9 ± 2.2). Assembled viral contigs were mapped to an in-house virus reference data separate from the GenBank non-redundant nucleotide (NT) database, and the sequences annotated as virus accounted for 35.34 and 55.04% of total sequences in samples of water flooding and microbial flooding, respectively. In water flooding, 7 and 6 viral families were identified in the injection and production wells, respectively. In microbial flooding, 6 viral families were identified in the injection and production wells. The total number of identified viral species in the injection well was higher than that in the production wells for both water flooding and microbial flooding. The Shannon diversity index was higher in the production well of water flooding than in the production well of microbial flooding. These results show that viruses are very abundant and diverse in the oil reservoir’s ecosystem, and future efforts are needed to reveal the potential function of viral communities in this extreme environment.

scholarly journals Streamline simulation study on recovery of oil by water flooding: A real case study on Haripur field

2016 ◽  
Vol 28 (1) ◽  
pp. 61-72
Author(s):  
Mohammad Amirul Islam ◽  
ASM Woobaidullah ◽  
Badrul Imam
Keyword(s):  
History Matching ◽  
Water Injection ◽  
Oil Production ◽  
Water Flooding ◽  
Present Condition ◽  
Optimum Number ◽  
Injection Wells ◽  
Reservoir Performance ◽  
Production Wells ◽  
Head Pressure

Haripur field is the first oil producing field in Bangladesh. The field produced approximately 0.53 MMSTB of oil from the well No. SY-7. The oil production began in 1987 and terminated in 1994. All of the oil was produced by the reservoir own energy from the depth of 2030 meter. Recent investigation and study have revealed that approximately 31 MMSTB Oil is remaining in that formation as validated by the reservoir performance based study i.e. oil production rate and tube head pressure history matching. At present condition, the reservoir has no pressure energy to lift the oil to surface as it requires minimum 1500 psi pressure, so it needs pressure energy to lift the oil to surface. Among the recent developed technologies water injection is one of the best methods to sweep oil towards the production well from the injection well as well as to provide sufficient pressure for lifting. In this study we proposed design for optimum waterflooding pattern and defined optimum number of injection and production wells. In addition the production and injection rates are optimized along with selection of the best placement of production and injection wells and their life.Bangladesh J. Sci. Res. 28(1): 61-72, June-2015

scholarly journals Study On Optimization Mechanism of Thermal Recovery Efficiency Under Different Geothermal Well Layout Conditions

2021 ◽  
Author(s):  
Jun-yi Gao
Keyword(s):  
Temperature Field ◽  
Rock Mass ◽  
Water Temperature ◽  
Working Condition ◽  
Thermal Recovery ◽  
Recovery Efficiency ◽  
Production Well ◽  
Injection Wells ◽  
Production Wells ◽  
Geothermal Wells

Abstract Efficient exploitation of geothermal energy is a hot issue concerned by scientific and engineering circles. The layout of different injection wells and production wells directly affects the temperature field of production wells and rock mass. In order to study the thermal recovery efficiency under different geothermal well layout conditions, based on the conceptual model of two injection wells and two production wells, a 3DEC program is used to calculate and analyze the influence of the different water inlet and water inlet of two injection wells and two production wells on the temperature field of rock mass, geothermal wells and the water temperature of production wells outlet. The results show that: (1) After the model injection wells are switched with the production wells, the temperature gradients of rock mass, production wells and injection wells are almost the same in numerical value and opposite in direction. (2) Production wells are set on the left side and injection wells are set on the right side of the model, and the injection wells and production wells are set at intervals; The temperature field of rock mass on both sides of the edge forms a central symmetry; The temperature gradient of rock mass from the middle to the edge is smaller and smaller, which indicates that the heat transfer speed of rock mass from the middle to the edge is slower and slower. Because the thermal superposition of adjacent injection wells and production wells through the rock mass between them is dominant, the water temperature at the outlet of production wells is the highest; In the interval water injection well and production well, the heat convection between water flow and rock is dominant, which makes the water temperature of production well outlet drops. (3) According to the water temperature at the outlet of production well, the optimal order of the model is working condition 3 > working condition 1 = working condition 2 > working condition 4, and the time to reach a steady state is the shortest in working condition 3 and the longest in working condition 4. The research results can provide important theoretical and practical reference for optimizing the layout of geothermal wells in efficient geothermal exploitation.

scholarly journals CAUSES AND ANALYSIS OF WATER ENCROACHMENT OF SOME OFFSHORE FIELDS PRODUCTS OF AZERBAIJAN

2021 ◽  
Vol 447 (3) ◽  
pp. 112-117
Author(s):  
Novruzova Sudaba ◽  
Gadashova Elmira ◽  
Fariz Ahmed
Keyword(s):  
Fluid Flow ◽  
Oil Recovery ◽  
Oil Production ◽  
Heterogeneous Structure ◽  
New Production ◽  
Injection Wells ◽  
Field Methods ◽  
Stage Of Development ◽  
Production Wells ◽  
The Republic

The results of researches of the water encroachment of some offshore fields (Neft Dashlary, Guneshli, Pirallahi, Darwin Banka, Apsheron Banka, Western Apsheron, etc.) of the Republic of Azerbaijan, most of which are at a late stage of development, have been presented. These fields are represented by weakly cemented and loose reservoirs of heterogeneous structure, in which there is an uneven fluid flow. Water breakthrough occurs through high-permeability layers, and layers with low permeability are involved in development to a less extent. Subsequent attempts to involve them in the development process cause an irrational increase in the volume of injected water, which leads to product encroachment. The type of reservoir, characterized by the presence of fracture zones, contributing to the flow of water from the aquifers to the producing wells, as well as improving their hydrodynamic connection with the injection wells, also contributes to the growth of the rate of watering. The geological and technological reasons for the water encroachment have been determined. The heterogeneity of the above mentioned deposits has been proven. It is indicated that an additional reason for the early water encroachment of production wells is the violation of the annulus tightness. Maintaining high rates of oil production is achieved by bringing in new production wells, while most of the watered wells are retired from operation without having exhausted their potential. It is proposed to carry out the measures that will ensure isolation of the most washed out zones and depleted areas of the main productive layer of the field. Methods of selective water isolation and flow diversion technologies should be carried out, first of all, in wells with an increased density of current reserves in order to obtain additional oil production and increase the oil recovery factor, as well as in wells with a high fluid flow rate.

OPTIONS OF PULSE NON-STATIONARY WATER FLOODING IN BLOCK SYSTEMS OF DEVELOPMENT

2017 ◽  
pp. 99-103 ◽  
Author(s):  
M. Ya. Habibullin ◽  
R. I. Suleymanov ◽  
L. Z. Zaynagalina ◽  
V. A. Petrov
Keyword(s):  
Water Injection ◽  
Filtration Velocity ◽  
Maximum Distance ◽  
Water Flooding ◽  
Relative Location ◽  
Single Group ◽  
Injection Wells ◽  
Cutting Line ◽  
Mode Of Operation ◽  
Production Wells

In the block systems of water flooding the features of relative location of injection and production wells allow for the variety of options for changing the mode of operation (single, group, block, etc.). The greatest overall effect of the change in filtration velocity at the cutting line, and hence also the effect of pulsed non-stationary flooding, is achieved by alternate stopping of wells. The maximum distance between the injection wells, the mode of operation of which can be changed at the same time, is limited by the duration of the stop and subsequent water injection. Thus, if the duration of half cycles is the same, then this ratio is equal to two, that is the wells in a row should be stopped through one row.

scholarly journals The shift of microbial population composition accompanying the injected water flowing in the water-flooding petroleum reservoirs

2014 ◽  
Vol 11 (12) ◽  
pp. 16773-16797 ◽  
Author(s):  
P. K. Gao ◽  
G. Q. Li ◽  
H. M. Tian ◽  
Y. S. Wang ◽  
H. W. Sun ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Produced Water ◽  
Water Flooding ◽  
Microbial Populations ◽  
Petroleum Reservoir ◽  
Injection Wells ◽  
Production Wells ◽  
Sieve Effect ◽  
Pass Through ◽  
A Minor

Abstract. In water-flooding petroleum reservoir, microbial populations in injected water are expected to migrate into oil-bearing strata and reach production wells. To demonstrate this, we firstly investigated microbial compositions in a homogeneous sandstone reservoir. The results indicated that the injected water harbored more microbial cells than produced water, and the shared populations and their abundance accounted for a minor fraction in injected water, while dominated in produced water, suggesting that most populations in injected water did hardly reach production wells in this reservoir. We further investigated microbial communities in water samples collected from wellhead and downhole of injection wells and production wells in a heterogeneous conglomerate reservoir. The results indicated that, except for the community reconstruction mainly resulted from dissolved oxygen, most populations were simultaneously detected in the wellhead and downhole of injection wells and production wells, suggesting that most microbial populations in injected water reached the production wells. This study suggest that microbial populations in injected water can pass through reservoir strata and reach production wells, but the reservoir heterogeneity, interwell spacing, sieve effect of strata and dissolved oxygen exert significant influence on microbial migration and distribution in reservoirs.

scholarly journals EFFICIENCY ESTIMATION OF THE FIGURE FLOODING METHOD

Neft i gaz ◽  
2020 ◽  
Vol 3-4 (117-1118) ◽  
pp. 109-117
Author(s):  
K.T. BISSEMBAYEVA ◽  
◽  
A.K. BISSEMBAYEVA ◽  
B.N. KOILYBAYEV ◽  
◽  
...  
Keyword(s):  
Development Process ◽  
Oil And Gas ◽  
Positive Impact ◽  
High Water ◽  
New Production ◽  
Injection Wells ◽  
Flow Rates ◽  
Production Wells ◽  
Efficiency Estimation ◽  
Water Cut

Methods of regulating the development of oil and gas fields play an important role in ensuring rational selection rates at the highest values of reservoir component recovery coefficients. The applied methods allowed the most rapid selection of recoverable oil reserves, but nevertheless, over time, many individual areas of the deposit were identified, whose reserves were developed at a low rate. Therefore, to improve the development of hard-to-recover reserves in these areas, zones, additional methods of influence are used by injecting a certain volume of water into the reservoir through new injection wells created by drilling them or transferring existing high-water wells for injection. At the same time, work is being carried out in existing wells to increase their productivity. This article discusses the application of figure flooding method as an additional method of regulating the development process of the Uzen deposit. The authors presented the results ДОБЫЧА 112 НЕФТЬ И ГАЗ 2020. 3–4 (117–118) of analysis of exploitation of oil areas of figure flooding. A study was conducted to identify the technological effect of the use of the figure flooding method. Figure flooding contributed to unsteady state fluid flow in reservoirs, which led to the reduction of water production wells before working intervals and also in some areas.This method hashad a positive impact on the development process by connecting new production intervals to the operation. The inclusion in the development of new productive formations and layers led to an increase in the flow rates of wells and oil production, as well as simultaneously to a decrease in the flow rates, liquid production and water cut. The quantitative assessment of efficiency was carried out by comparing the corresponding actualandcalculatedtechnological indicators.Thepaperpresentsanalyticalformulas thatwereused to calculate changes in the analyzed data in case there was no specified method. The calculated values of oil and liquid flow rates and water level of sections of the XIV and XV horizons were determined under the assumption that there would be no figure flooding. The results of calculations of technological indicators and processing of actual data, as well as the technological advantages of individual sections are presented. It is established that the use of shaped flooding in the complex will allow full connection to the work of new oil-saturated reservoirs, if new independent systems of arrangement are created to ensure the appropriate hydrodynamic parameters of pressure at the mouths and faces of injection and production wells

scholarly journals A new mathematical modeling approach for thermal exploration efficiency under different geothermal well layout conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Junyi Gao ◽  
Qipeng Shi
Keyword(s):  
Mathematical Modeling ◽  
Heat Transfer ◽  
Rock Mass ◽  
Temperature Distribution ◽  
Water Temperature ◽  
Production Well ◽  
Injection Wells ◽  
Geothermal Well ◽  
Production Wells ◽  
Geothermal Wells

AbstractThe water temperature at the outlet of the production well is an important index for evaluating efficient geothermal exploration. The arrangement mode of injection wells and production wells directly affects the temperature distribution of the production wells. However, there is little information about the effect of different injection and production wells on the temperature field of production wells and rock mass, so it is critical to solve this problem. To study the influence mechanism of geothermal well arrangement mode on thermal exploration efficiency, the conceptual model of four geothermal wells is constructed by using discrete element software, and the influence law of different arrangement modes of four geothermal wells on rock mass temperature distribution is calculated and analyzed. The results indicated that the maximum water temperature at the outlet of the production well was 84.0 °C due to the thermal superposition effect of the rock mass between the adjacent injection wells and between the adjacent production wells. Inversely, the minimum water temperature at the outlet of the production well was 50.4 °C, which was determined by the convection heat transfer between the water flow and the rock between the interval injection wells and the interval production wells. When the position of the model injection well and production well was adjusted, the isothermal number line of rock mass was almost the same in value, but the direction of water flow and heat transfer was opposite. The study presented a novel mathematical modeling approach for calculating thermal exploration efficiency under various geothermal well layout conditions.

Key Technology and Application of Workshop Production Management System

2011 ◽  
Vol 411 ◽  
pp. 370-373
Author(s):  
Ya Dong Fang ◽  
Fang Wang ◽  
Bo Sun
Keyword(s):  
Management System ◽  
Production Management ◽  
Dynamic Structure ◽  
New Production ◽  
Report Generation ◽  
Key Technology ◽  
Production Management System ◽  
Structure Tree ◽  
Jsp Technology ◽  
Generation Technology

Abstract. In order to resolve problem of production plane and dispatch problem in manufacturing plant, a new production management system is proposed, and the key technology and application of system is discussed. Generation technology of dynamic structure tree is firstly introduced. More ever, dynamic report generation technology is also discussed and based data, and information management is realized based on JSP technology. Lastly, typical interface of workshop production management system is described.

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.

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