scholarly journals High-Precision Numerical Simulation on the Cyclic High-Pressure Water Slug Injection in a Low-Permeability Reservoir

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jie Zhan ◽  
Chao Fan ◽  
Xianlin Ma ◽  
Zigang Zheng ◽  
Zezhong Su ◽  
...  
Keyword(s):  
High Pressure ◽  
High Precision ◽  
Low Permeability ◽  
Pilot Test ◽  
The Novel ◽  
Reservoir Properties ◽  
Well Pattern ◽  
Short Period ◽  
Pressure Water ◽  
The Impact

The paper presents a novel waterflooding technique, coupling cyclic high-pressure water slug injection with an asynchronous injection and production procedure, to address the inefficient development of low-permeability oil reservoir in Shengli Oilfield, a pilot test with 5-spot well pattern. Based on the first-hand data from the pilot test, the reservoir model is established. With an in-depth understanding of the mechanism of the novel waterflooding technique, different simulation schemes are employed to screen the best scheme to finely investigate the historical performance of the pilot test. The production characteristics of the pilot test are both qualitatively and quantitatively investigated. It is found that the novel waterflooding technique can provide pressure support within a short period. And the formation around the injector is significantly activated and deformed. Once passing the short stage of the small elastic deformation, the reservoir immediately goes through the dilation deformation accompanied with the opening of microfractures so that the reservoir properties are significantly improved, which leads to better reservoir performance. With the multicyclic dilation-recompaction geomechanical model, the impact of pressure cyclic evolution on the reservoir properties and performance under the novel waterflooding mode of cyclic high-pressure water slug injection is taken into consideration. The historical data of the pilot test is well matched. In the study, a high-precision simulation scheme for the novel waterflooding technique in low-permeability reservoirs is proposed, which provides significant technical support for further optimization of the pilot test and large-scale application of the novel waterflooding technique.

Parametric Study of Channeling Flow in Low Permeability Reservoir with Mudstone Interlayer

2012 ◽  
Vol 524-527 ◽  
pp. 1190-1195
Author(s):  
Jian Jun Liu ◽  
Quan Shu Li ◽  
Gui Hong Pei
Keyword(s):  
High Pressure ◽  
Water Injection ◽  
Injection Pressure ◽  
Element Model ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Injection Process ◽  
Well Spacing ◽  
Pressure Water ◽  
Channeling Flow

Channeling flow frequently occurs during the high pressure water injection of low permeability reservoir. The injection process is complex and covers so many parameters of which the contribution to channeling flow is necessarily to be studied. In this paper, numerical simulation is combined with sensitivity analysis method to calculate the significance of the weight of parameters to the channeling flow. First the values of different parameters are produced by using Latin hypercube method; second, by using these parameters, finite element model have been established and simulated, and the quantity of channeling flow has been calculated; then Spearman rank relation is applied to measure the relation of parameters and channeling flow. The results states that, in 10 years continuous injection, the well spacing and injection pressure have significant impact on the channeling flow. This states that during the application of high pressure water injection, the pressure and well spacing should be controlled especially.

Low Permeability Reservoir Quantitative Analysis of Diagenesis Evolution - Taking Xishanyao Reservoir in Niuquanhu Area as an Example

2015 ◽  
Vol 1092-1093 ◽  
pp. 1410-1415
Author(s):  
Yuan Kang ◽  
Wei Sun ◽  
Ting Shang ◽  
Jian Chao Shi ◽  
Jun Sheng
Keyword(s):  
Quantitative Analysis ◽  
Physical Property ◽  
Low Permeability ◽  
Reservoir Properties ◽  
Thin Sections ◽  
Low Permeability Reservoir ◽  
Quantitative Calculation ◽  
Pore Evolution ◽  
Calculation Results ◽  
The Impact

The Xishanyao reservoir in Niuquanhu area is a typical low permeability reservoir Diagenesis is very important for the physical property of reservoir. Through analyzed data of cast thin sections and scanning electron microscopy (SEM) data, analyzed the impact of main diagenesis on reservoir properties in Niuquanhu area. First, quantitative analyzed the various types of diagenesis on reservoir porosity contribution rate. Second, through restoring the original porosity, quantitative analyzed the pore evolution of reservoir caused by various types of diagenesis. Realized the quantitative analysis of porosity of each diagenesis stage. The quantitative calculation results agree well with the experimental analysis results, the error is 1.09%~1.51%, which showed the rationality of research method and the research results have certain reliability. The study of diagenesis has important significance for fine evaluation and favorable area prediction of Niuquanhu area reservoir.

Quantifying the Effect of Multiphase Flow on Matrix Acidizing in Oil-Bearing Carbonate Formations

2021 ◽  
pp. 1-12
Author(s):  
Mohamed Elsafih ◽  
Mashhad Fahes
Keyword(s):  
High Pressure ◽  
Multiphase Flow ◽  
Injection Rate ◽  
Low Permeability ◽  
Matrix Acidizing ◽  
Permeability Heterogeneity ◽  
Acid Injection ◽  
Water Saturated ◽  
Carbonate Formations ◽  
The Impact

Summary It is common to inject acidic stimulation fluids into oil-bearing carbonate formations to enhance well productivity. This process of matrix acidizing is designed to maximize the propagation of wormholes into the formation by optimizing the injection parameters, including acid-injection rate and volume. Previous studies have suggested that saturation conditions, permeability, heterogeneity, temperature, and pressure can significantly affect the design of matrix-acidizing treatments. However, laboratory studies’ results are inconsistent in their conclusions and are mostly limited to water-saturated cores. In this work, we designed a systematic experimental study to evaluate the impact of multiphase flow on the acidizing process when injecting 15 wt% hydrochloric acid (HCl) into crude-oil-saturated Indiana Limestone cores. The results reveal the following: Contrary to published literature for water-saturated cores, acidizing in partially oil-saturatedhigh-permeability cores at high pressure requires less acid volume than in low-permeability cores; lower-pressure acid injection results in more efficient wormhole propagation in low-permeability cores compared to high-pressure acid injection; acidizing in low- and high-permeability cores at low pressure leads to similar efficiency; and wormholing is more effective in partially oil-saturated cores, resulting in multiple parallel branches as compared to inefficient leakoff in water-saturatedcores.

Study on Cold Expansion Process of High Pressure Components

2013 ◽  
Vol 312 ◽  
pp. 469-474
Author(s):  
Shi Jin Zhang ◽  
Yan Li Wang ◽  
Feng Ling Yang
Keyword(s):  
High Pressure ◽  
Pressure Field ◽  
Strengthening Mechanism ◽  
Fatigue Properties ◽  
Expansion Process ◽  
Cold Expansion ◽  
Short Period ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Very High

In high pressure water jet field, most components worked under very high fluctuated pressure. The high and fluctuated pressure would fail those components quickly, which leads to very short period of fatigue life for high pressure components. Cold expansion process could improve components fatigue properties greatly. This has been known for a while. By applying this process in high pressure field, much longer service time is expected. This paper investigated the cold expansion process experimentally. Based on micro-structure investigation, the strengthening mechanism has been explored.

scholarly journals Hard Rock Mining Using Disk Tools Supported by High-Pressure Water Jets in the Aspect of Reducing Energy Consumption

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2595
Author(s):  
Krzysztof Kotwica
Keyword(s):  
High Pressure ◽  
Cutting Tools ◽  
Similarity Criteria ◽  
Dust Generation ◽  
Water Jets ◽  
Mechanical Methods ◽  
Rock Mining ◽  
Pressure Water ◽  
Working Parameters ◽  
The Impact

The mining of hard rocks by mechanical methods, using cutting tools, is associated with problems such as sparking, dust generation and increased wear. The application of disk tools allows limiting these problems but requires constructing a machine with large dimensions and weight. To limit these problems, high-pressure water jets can be applied. The article presents the effects of using this solution in the field and stand tests when mining rocks with a symmetrical disk. The results of the bench tests of high-pressure water jets to support the process of mining with symmetrical disks, carried out at the AGH University of Science and Technology, performed on a unique test stand, which enabled the samples to be mined in a circular trajectory in conditions similar to real ones, are presented. With the use of a dimensional analysis, a theoretical-empirical model was developed to estimate the impact of slots cut by water jets on the tool load and the amount of output as a function of slots spacing and depth. Considering the similarity criteria for the mined rock sample (mechanical properties), it is possible, with the use of this model, to estimate the most advantageous working parameters while hydromechanical mining uses disks on a larger cutting radius.

The Measurement of the Velocity Outside the High Pressure Water Jet and Abrasive Water Jet Nozzle Based on the Energy Transfer Method

2010 ◽  
Vol 135 ◽  
pp. 361-364 ◽  
Author(s):  
Rong Guo Hou ◽  
C.Z. Huang ◽  
H.T. Zhu ◽  
Z.W. Niu
Keyword(s):  
High Pressure ◽  
Energy Transfer ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Impact Forces ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Transfer Method ◽  
The Impact ◽  
Core Part

The energy transfer method is used to measure the flow velocity of the outside the high pressure water jet (WJ) and Abrasive water jet (AWJ) nozzle. The impact forces of the flow measured by the piezoelectricity ergometer will be transformed to the velocity value, the average velocity of the flow outside the nozzle will be obtained. The result indicates the velocity will reduce along the direction of the flow, and the velocity of the AWJ flow will reduced greatly than the WJ flow, which indicates that the length of the core part of the AWJ flow is shorter than the WJ Flow, the stand-off should be within the 0mm-15mm ranges to gain the most effective machining.

Research on the Decoating Effect and Microstructure of Surface Damage of High-Pressure Waterjet

2014 ◽  
Vol 541-542 ◽  
pp. 180-184
Author(s):  
Qi Guo ◽  
Xiu Jie Jia ◽  
Shuo Li ◽  
Yan Yan Nie ◽  
Shun Xin Ge
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Impact Test ◽  
Surface Damage ◽  
Water Jet ◽  
Surface Damages ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Coated Surfaces ◽  
The Impact

The high-pressure water jet is utilized to perform impact test on coated surfaces with different hardness. The decoating effect is measured and the surface roughness change can be tested by White-light Interferometer (WLI). Also the microstructure of surface damage after impact test is analyzed. The result shows that when utilizing high-pressure water jet to clean the coating, it’s a better choice to start at the place where the coating is broken. The gap will be enlarged rapidly and the decoating velocity will increase linearly. Otherwise, the impact of water jet will cause surface damages and generate holes of particular shape. This kind of hole is flat in the middle, then forming a sunken district and apophysis successively along the radius outwards.

The Semiconductor Character of Passive Film of 304L Stainless Steel(SS), 316L SS and Nickel Alloy 800 Formed in Zinc Contained High-Temperature and High-Pressure Water

2011 ◽  
Vol 183-185 ◽  
pp. 1847-1851
Author(s):  
Sheng Han Zhang ◽  
Jia Lian ◽  
Yu Tan
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
High Temperature ◽  
Passive Film ◽  
304L Stainless Steel ◽  
Alloy 800 ◽  
Zinc Addition ◽  
Pressure Water ◽  
The Impact ◽  
Semiconductor Properties

The semiconductor properties of passive film formed on 304L stainless steel (SS), 316L SS and Alloy 800HT in high-temperature and high-pressure water with zinc addition have been investigated by using Polarization curve, Mott-Schottky analysis and photocurrent method. The donor density, flat band and band gap of semiconductor behavior are analyzed to investigate the impact of zinc addition to the passive film. Analysis of the experimental results indicated that passive film formed on 316L and 800HT with zinc addition showed different electrochemical, photo-electrochemical and semiconductor properties. The results indicated that corrosion resistance of passive film from in high-temperature and high-pressure water with zinc addition was obviously better than that without zinc addition.

scholarly journals The optimization of pre-slug size in CO2-N2 compound flooding

2020 ◽  
Vol 206 ◽  
pp. 02017
Author(s):  
Taoping Chen ◽  
Wen Sun ◽  
Guofang Zhang ◽  
Fuping Wang
Keyword(s):  
Oil Recovery ◽  
Oil And Gas ◽  
Element Model ◽  
Low Permeability ◽  
Experimental Conditions ◽  
Well Spacing ◽  
Well Pattern ◽  
Complete Miscibility ◽  
Enhance Oil Recovery ◽  
The Impact

In order to enhance oil recovery in low and ultra-low permeability layer, both of the numerical simulation and physical model experiment have been researched. First, the dynamic distribution of CO1 and N1 in the oil and gas phase in the CO2-N2 compound flooding process was numerically simulated by using the long slim-tube model. The results show that the CO2 slug should have at least 0.3 PV to prevent the impact of N2 channeling effectively. Second, under the experimental conditions of complete miscibility of CO2-crude oil, the two types of natural cores including low and ultra-low permeability, respectively, are used for experimental study on oil displacement. The results confirm that CO2-N2 compound flooding with 0.3 PV CO2 pre-slug can achieve a good result. Finally, a five-point well pattern element model is established by CMG. The recovery and the gas cost of per ton of oil are calculated respectively for CO2-N2 compound flooding and full CO2 flooding at 300 m well spacing of low and ultra-low permeability layer. According to the simulation results, the optimal CO2 pre-slug size in CO2-N2 compound flooding under the condition of low and ultra-low permeability layer five-point well pattern is 0.4 PV.

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