Effect Of Water Injection Research Articles

Improvement of wettability of coal seams in water injection via co-deposition of polydopamine and polyacrylamide

Water injection into coal seams is important for dust prevention in mines. However, owing to the hydrophobicity of coal itself, the wetting effect of water injection on coal seams has yet to be enhanced. Herein, based on the hydrophobicity of coal, hydrophilic modification of the coal surface has been proposed via co-deposition of polydopamine (PDA) and polyacrylamide (PAM). Using water contact angle (WCA) test, atomic force microscope (AFM) test, X-ray photoelectron spectroscopy (XPS) characterization, and 1H nuclear magnetic resonance spectroscopy (1H NMR) measurements, the feasibility of hydrophilicity modification of coal by PDA/PAM has been investigated. The results indicate that when DA concentration is 2 mg/mL, deposition time is 45 min, and DA/PAM feeding molar ratio is 1:1, the wettability of modified coal sample clearly improves. In the water content test and dust-production test using gravity drop hammer, the modified coal exhibits good wettability and low dust production. Also, UV-Vis absorption spectroscopy and WCA results suggest that PDA/PAM coating exhibits good stability. Therefore, the modification method can effectively enhance the wetting effect of injected water on coal seam, providing a novel approach for dust prevention.

Infrared Experimental Investigations of the Effects of Direct Water Injection in an Optical Engine

Abstract The effects of water injection (WI) on combustion characteristics were investigated in an optically accessible light-duty engine retrofitted with a side-mounted water injector. The main objective was to study the effect of water injection on autoignition and subsequent combustion process in compression ignition (CI) engines. Numerical zero-dimensional simulations were first performed to separate the thermal from the kinetic effects of water on the ignition delay and maximum temperature reached by a reacting mixture. Then, experimental investigations were performed at different intake temperatures and levels of thermal stratification achieved via direct water injection. Combustion analysis was performed on cylinder pressure data to study the effect of water injection on the overall combustion process. Infrared (IR) imaging was performed to provide insight to how water injection and the resulting water distributions affect thermal stratification, autoignition, and combustion characteristics. A new method in quantifying the water distributions is suggested. The results show that the overall level of stratification is sensitive to water injection timing and pressure, where increased water injection pressures and advanced injection timings result in more homogenous distributions. Moreover, water injection was found to affect the location of ignition kernels and the local presence of water suppressed ignition. The level of water stratification was also observed to affect the combustion process, where more homogenous distributions lost their ability to influence ignition locations. Finally, the infrared images showed high levels of residual water left over from prior water-injected cycles, suggesting that hardware configurations and injection strategies must be optimized to avoid wall wetting for stable engine operation.

The Effect Mechanisms of Intake Manifold Water Injection on the Emissions of a Natural Gas Engine

NOx is the main emission of lean burn natural gas engine (NGE). Water injection (WI) is an effective method to reduce NOx, which has been widely studied in conventional fuel engine. Currently, there are few researches on the application of WI in NGE. The influences of WI on NGE are not clear. In the paper, the effect mechanisms of WI on the emissions of NGE are studied. Based on the thermodynamic properties of water and the combustion mechanism of natural gas, the emissions generation mechanism of NGE with WI was analyzed. According to the experimental system, the effects of intake manifold water injection (IMWI) on the emissions of a lean burn NGE was carried out. The results show that, with WI, the in-cylinder temperature decreased greatly, which effectively inhibited the formation of thermal NO. Water generated a lot of OH groups, which effectively inhibited the formation of rapid NO. At 1800 rpm and 0.92g/s WI rate, NOx is reduced by 70.4%. OH group could effectively promote CO oxidize to CO2. At 1000 rpm and 0.92g/s WI rate, CO is decreased by 22.2%. However, since the decrease of the total activation energy of combustion reaction, the chain breaking reaction increased, resulting in a significant increase in HC. At 800rpm and 0.92g/s WI rate, HC was increased by 11.6%.

Effect of water injection on subsequent polymer floods in viscous oil reservoirs

Waterfloods (WF) in viscous oil reservoirs (>100 cp) are unstable and usually bypass a large amount of oil. Polymer floods (PF) often follow waterfloods and improve oil recovery through improved sweep efficiency. This study examines the effect of prior waterflood on the subsequent polymer flooding. The displacement of a viscous oil by water and polymer solution is studied in a custom-built 2D porous medium. Floods are conducted at the interstitial velocity of 1 ft/day with the oil viscosity (μo) of 390 cp at 25 °C. The extent of waterflood beyond the water breakthrough (WBT) is varied from 0 to 0.5 injected pore volume (PV). Polymer injection after the waterflood displaces the oil which further pushes the brine in the established water fingers and is reflected in a decrease in the water cut down to 0–0.3. After dewatering of the fingers, the polymer solution displaces the oil across the whole cross-section. The final recoveries range from 73 to 83 % of the original oil in place (OOIP). Injecting the viscous solution at earlier stages results in earlier production, higher crest of oil cut (fo) and slightly higher cumulative oil production (NpD). This work can help engineers optimize the strategy of polymer flooding in viscous oil reservoirs.

Direct water injection and combustion time in SI engines

Over time, internal combustion engines were profoundly developed becoming more reliable, more economical and less polluting. Even if the current trend is headed towards hybrid and electric vehicles, the development of these engines continues by optimizing its operation with alternative fuels and innovative technologies. Water injection in internal combustion engines is one important way towards engine optimization. This study aims to experimentally determine the effects of direct water injection on the combustion duration of spark-ignition engines. As the thermal processes in internal combustion engines are very complex, the shape of the combustion chamber and other factors, such as the direct water injection timing has a direct influence on the results. This paper explores the potential for such a system in terms of combustion duration showing that the water injection can be beneficial. The concept was applied to a side-valve engine, as this design has a broader potential for injector location and aim.

Water injection in spark ignition engines—Impact on engine cycle

Water injection in internal combustion engines is mainly used for additional cooling of the combustion chamber and knock suppression. The main advantages of the water injection are the potential for the enhancement of the performance of the engine. Studies conducted so far have aimed to track engine performance at maximum load and fuel consumption (brake-specific fuel consumption BSFC). Specialized literature is less consistent as regards to the injection of water at medium and low loads. This work monitors the effects of water injection at medium loads and the evolution processes of the four-strokes in the engine with and without water injection. A side-valve, air cooled natural aspirated engine with water and fuel injections in the intake manifold was used for this study. The work during expansion was increased, but this trend was reversed by the higher loads required during intake, compression and exhaust strokes, leading to a reduction in the indicated efficiency when water was injected.

Effects of direct water injection timings on knock suppression, combustion, and emission performance of high compression ratio hydrogen-enriched natural gas engine

In this study, an approach of direct water injection was applied to suppress knock in the high compression ratio (CR) hydrogen-enriched natural gas (NG) engine. A CFD model for the high CR hydrogen-enriched NG engine was established and its effectiveness was verified by experimental data. On this basis, effects of water injection (WI) timings on knock mitigation, combustion, and emission features of the hydrogen-enriched NG engine were studied in detail. Results show that due to the slower flame propagation speed, monitoring points No.3 and 4 (the area near the intake valve) is more likely to knock accompanied by the higher flow velocity and turbulent kinetic energy. Besides, with the advance of WI timing, KI (knock intensity) keeps nearly unchanged firstly and then has a little increase after the second phase of reduction, whose minimum occurs at −150 °CA. Meanwhile, IMEP, CA10-90, and indicated thermal efficiency (ITE) have a similar change tendency with the maximum at −150 °CA, and ITE reaches its peak of about 40.9% with an increment of 3%. From −30 °CA to −180 °CA, NOx decreases a lot, while HC and CO emissions increase to some extent. Therefore, proper WI timing can not only effectively reduce KI and NOx emission, but also improve thermal efficiency and realize high CR in spark-ignition NG engines further.

Study on the coal damage effects caused by the CO2-alkaline water two-phase displacing gas and wetting coal

The technique of CO2-alkaline water two-phase displacing gas and wetting coal can effectively prevent the risk of coal and gas outburst, while it will damage coal under the erosion of both acid and alkali. To explore the influence of this measure on the physical and chemical properties of coal, the variations of minerals and micro-structures in different coal samples were tested with several research methods including the XRD, XRF and FTIR. The results showed that, after adopting this method, the content of kaolinite and AI, Si and S decreased to different extent, and the content of carbonate, C and Na increased clearly. In the immersed water of DL, ZX and XT coal samples, the HCO3– disappeared completely, the Ca2+ and Mg2+ decreased markedly, while the content of CO32– increased observably, with the increment of 88.7%, 85.3%, 77.7%. The micro-structure in coal was more developed, there were more granular minerals distributed on the surface of coal, and the number and diameter of pore structure all rose. The total volume and the average diameter of pore structure in three coal samples increased distinctly, with the increment of 87.5%, 62.5%, 37.5% and 121.8%, 8.5%, 20.3%, respectively. In addition, the proportion of oxygen-containing functional groups in three coal samples increased significantly, with the increment of 11.4%, 41.4% and 4.5%. Therefore, this measure can obviously improve the effects of water injection, the hydrophily, and the water-holding capacity of coal, more effectively prevent the danger of coal and gas outburst.

Effect of direct water injection on combustion and emissions characteristics of marine diesel engines

In this study, the effect of direct water injection (DWI) was investigated on the performance of marine diesel engine based on the three-dimensional simulation model. The water injection quantity, temperature and timing were researched on the in-cylinder pressure and temperature, indicated power and NOx emissions. Then, the DWI strategies were compared with the exhaust gas recirculation (EGR). The results showed that the in-cylinder pressure, temperature, indicated power and NOx emissions decrease with increasing of water quantity. Reductions in NOx emissions up to 55.6% were obtained after applying DWI to the engine at the compression stroke. The water injection temperature has a little effect on the combustion and emissions of marine engine. The indicated power decreased when the water injection timing in the compression stroke. However, the indicated power increased when the water injection timing in the late combustion phase. The water injection timing in the compression stroke has more potential in reduction NOx emissions. The NOx emissions with water injection in the compression stroke decreased by 40% compared to the value with water injection in the later combustion phase. The ability of DWI and EGR were researched on the solve the trade-off between power and NOx emissions. The results showed that the DWI strategy can reduce NOx emissions at the higher indicated power compared with the results of EGR.

Experimental Study on Enhanced Oil Recovery by Nitrogen-Water Alternative Injection in Reservoir with Natural Fractures

The production of a low permeability reservoir decreases rapidly by depletion development, and it needs to supplement formation energy to obtain stable production. Common energy supplement methods include water injection and gas injection. Nitrogen injection is an economic and effective development method for specific reservoir types. In order to study the feasibility and reasonable injection parameters of nitrogen injection development of fractured reservoir, this paper uses long cores to carry out displacement experiment. Firstly, the effects of water injection and nitrogen injection development of a fractured reservoir are compared through experiments to demonstrate the feasibility of nitrogen injection development of the fractured reservoir. Secondly, the effects of gas-water alternate displacement after water drive and gas-water alternate displacement after gas drive are compared through experiments to study the situation of water injection or gas injection development. Finally, the reasonable parameters of nitrogen gas-water alternate injection are optimized by orthogonal experimental design. Results show that nitrogen injection can effectively enhance oil production of the reservoir with natural fractures in early periods, but gas channeling easily occurs in continuous nitrogen flooding. After water flooding, gas-water alternate flooding can effectively reduce the injection pressure and improve the reservoir recovery, but the time of gas-water alternate injection cannot be too late. It is revealed that the factors influencing the nitrogen-water alternative effect are sorted from large to small as follows: cycle injected volume, nitrogen and water slug ratio, and injection rate. The optimal cycle injected volume is around 1 PV, the nitrogen and water slug ratio is between 1 and 2, and the injection rate is between 0.1 and 0.2 mL/min.

A NEW FRACTAL MODEL OF COAL PERMEABILITY BASED ON THE INCREASING FRACTAL CONSTRUCTION METHOD OF THE MENGER SPONGE

The permeability of coal seams directly determines the disaster prevention effect of water injection. It is of great significance to realize the accurate fractal expression of coal structure and construct a fractal permeability model for elucidating the dynamic evolution law of the permeability of coal during and after water injection. Therefore, a rough Menger sponge is used as the physical model to characterize the structure of the coal in this paper. Combined with the structure fractal dimension calculated by the increasing fractal construction method, a new fractal permeability model is established to describe the seepage process of water injection. The influence of the tortuosity and roughness of the pore surfaces on the seepage characteristics is discussed, and the theoretical permeability is compared with the results of NMR experiments and existing models. The volume fractal dimension obtained by calculation is between 2.74 and 2.77, which decreases with increasing confining pressure and increases with increasing pore water pressure. The research shows that the fractal dimensions of the pore structure and volume can quantitatively describe the specific surface area of porous medium and are directly proportional to the specific surface area. With the increase in the structure fractal dimension, the fluid flow resistance increases, and the theoretical permeability decreases. The results of the permeability comparison show that the variation law of the theoretical permeability is consistent with that of the liquid permeability and that the theoretical result is closer to the measured value because the tortuosity and roughness of the seepage channel surfaces is further considered in the model. The theoretical model provides reliable theoretical support for further perfecting seepage theory of porous media and improving the effect of coal seam water injection.

The effect of direct water injection on the combustion stability of a downsized boost engine under high compression ratios and load conditions

Studying the combustion stability of engines equipped with a direct water injection system, especially under high compression ratios and load conditions, is important for realizing the stable operation of downsized boost engines with high thermal efficiency. This study implements a downsized single-cylinder engine with a direct water injection system to systematically investigate the combustion stability under a high compression ratio (CR = 17) and load (IMEP = 9 bar). According to the study results, when the water mass increases, the increase in combustion duration and retardation of the combustion phase at a fixed spark timing lead to more severe fluctuations of cycle-to-cycle variations in the indicated mean effective pressure. This research also indicates that water direct injection advances spark timing to increase power capability while maintaining better combustion stability. It can extend the knock limit spark advance to varying degrees when the water/fuel ratio increases from 0.1 to 0.5. In addition, the coefficient of variation in the indicated mean effective pressure drops to 1.15% with knock limit spark advance when the water/fuel mass ratio is up to 0.5.

A comprehensive evaluation of water injection in the diesel engine

Due to increasing climate awareness and the introduction of much stricter exhaust emission legislation the internal combustion engine technology faces major challenges. Although the development and state of technology of internal combustion engines generally reached a very high level over the last years those need to be improved even more. Combining water injection with a diesel engine, therefore, seems to be the next logical step in developing a highly efficient drive train for future mobility. To investigate these potentials, a comprehensive evaluation of water injection on the diesel engine was carried out. This study covers >560 individual operating points on the test bench. The tests were carried out on a single-cylinder derived from a Euro 6d four-cylinder passenger car with the port water injection. Furthermore, a detailed pressure trace analysis (PTA) was performed to evaluate various aspects regarding combustion, emission, etc. The results show no significant effects of water injection on the combustion process, but great potential for NOx reduction. It has been shown that with the use of water injection at water-to-fuel rates of 25%, 50%, and 100%, NOx reduction without deterioration of soot levels can be achieved in 62%, 40%, and 20% of the experiments, respectively. Furthermore, water injection in combination with EGR offers additional reduction in NOx emissions.

Effects of Water Injection Strategies on Oxy-Fuel Combustion Characteristics of a Dual-Injection Spark Ignition Engine

Currently, global warming has been a serious issue, which is closely related to anthropogenic emission of Greenhouse Gas (GHG) in the atmosphere, particularly Carbon Dioxide (CO2). To help achieve carbon neutrality by decreasing CO2 emissions, Oxy-Fuel Combustion (OFC) technology is becoming a hot topic in recent years. However, few findings have been reported about the implementation of OFC in dual-injection Spark Ignition (SI) engines. This work numerically explores the effects of Water Injection (WI) strategies on OFC characteristics in a practical dual-injection engine, including GDI (only using GDI), P50-G50 (50% PFI and 50% GDI) and PFI (only using PFI). The findings will help build a conceptual and theoretical foundation for the implementation of OFC technology in dual-injection SI engines, as well as exploring a solution to increase engine efficiency. The results show that compared to Conventional Air Combustion (CAC), there is a significant increase in BSFC under OFC. Ignition delay (θF) is significantly prolonged, and the spark timing is obviously advanced. Combustion duration (θC) of PFI is a bit shorter than that of GDI and P50-G50. There is a small benefit to BSFC under a low water-fuel mass ratio (Rwf). However, with the further increase of Rwf from 0.2 to 0.9, there is an increment of 4.29%, 3.6% and 3.77% in BSFC for GDI, P50-G50 and PFI, respectively. As WI timing (tWI) postpones to around −30 °CA under the conditions of Rwf ≥ 0.8, BSFC has a sharp decrease of more than 6 g/kWh, and this decline is more evident under GDI injection strategy. The variation of maximum cylinder pressure (Pmax) and combustion phasing is less affected by WI temperature (TWI) compared to the effects of Rwf or tWI. BSFC just has a small decline with the increase of TWI from 298 K to 368 K regardless of the injection strategy. Consequently, appropriate WI strategies are beneficial to OFC combustion in a dual-injection SI engine, but the benefit in fuel economy is limited.

Investigation of Performance and Emission Parameters of Hydroxygen (HHO)-Enriched Diesel Fuel with Water Injection in the Compression Ignition Engine

The development of engine technologies and research on combustion processes are focused on finding new generation CI engines with simple control of the combustion process while efficiently maintaining desirable engine performance and meeting emission regulations. This comprehensive study on the relatively low hydrogen energy fraction (0.65–1.80%), supplied by onboard water electrolysers and on water injection, was performed on the performance and emission parameters of the CI engine. The article presents results of both experiment and simulation about the effect of hydroxygen and water injection on the combustion process, auto-ignition delay, combustion intensity, the temperature of the mixture and engine performance at BMEP of 0.2 MPa, 0.4 MPa, 0.6 MPa, and 0.8 MPa at a speed of 1900 rpm. For the first part, the test engine operated with diesel fuel with 3.5 L/min of hydroxygen gas supplied with an external mixture formation. The HHO has an effect on the combustion process at all range of BMEP. A decrease in BTE and increase in BSFC were noticed during tests. The peak pressure and the rate of heat release decreased, but the NOx decreased as well. The second part of experiment was performed with the injection of a substantial amount of water, 8.4–17.4 kg/h (140–290 cm3/min), and the same amount of hydroxygen. The injection of water further decreased the NOx; therefore, HHO and WI can be used to meet emission regulations. A simulation of the combustion process was carried out with the AVL BOOST sub-program BURN. The AVL BOOST simulation provided a detailed view of the in-cylinder pressure, pressure-rise, combustion intensity shape parameter and SOC.

Experimental studies on the influence of sodium lauryl sulfate on seepage and wetting of water infusion of coalbeds

Coal seam water injection is a disaster prevention technology that is commonly used in the mining of underground coal resources. Surfactants are widely used in the coal industry in China to enhance the effect of coal seam water injection. Surfactants may have a potential impact on the seepage stage while enhancing wetting. In order to study the characteristics of surfactants on coal seam water injection, we adopted sodium dodecyl sulfate (SDS) as a surfactant in this study. Based on the research background of the Houwenjialiang Coal Mine in Ordos City, Inner Mongolia Autonomous Region, China, we examined the effect of the surfactant SDS on the seepage stage of coal seam water injection using a laboratory triaxial seepage system. The influence of the surfactant SDS on the coal seam water injection wetting stage was investigated with a laboratory bottom-up imbibition experiment method. The main conclusions are as follows. The addition of surface activity can enhance the wetting effect but impede the seepage stage of coal seam water injection, which deteriorates the permeability coefficient. After the addition of surfactant, the permeability coefficient shows a rapid decrease first and then gradually stabilizes. The reason for the compromise to the permeability coefficient is mainly due to the small cracks or pores caused by the adsorption of SDS, which slows down the flow of the liquid. The addition of surfactants can effectively reduce the surface tension of the liquid, minimize the contact angle, and enhance the coal seam water injection wetting stage. The research results provide valuable information for evaluating coal seam water injection effect and the development of water injection technology.

Comprehensive evaluation of waterflooding front in low‐permeability reservoir

AbstractDue to the development characteristics of low‐permeability reservoirs such as weak water absorption, slow development of water injection, and strong pressure sensitivity, the effect of water injection in low‐permeability reservoirs is quite different from that in medium and high‐permeability reservoirs. Therefore, in oilfield development, it is important to study the movement law of the waterflooding front in low‐permeability reservoirs. In this paper, taking the Jilin oilfield as an example, a geological model of Xinmin 23 Block was established for the numerical simulation analysis considering the heterogeneity of low‐permeability reservoirs. In addition, artificial cores were manufactured to conduct the physical experiment of the waterflood front advance of cores with different physical properties under the influence of various factors such as the fracture and the range by the constant‐velocity flooding. Based on the numerical simulation and the physical experiment, the movement law of the waterflood front was analyzed and a basic method for evaluating the waterflooding development in low‐permeability reservoirs was established to provide feasible insights for the waterflooding development in low‐permeability reservoirs. In this paper, numerical simulation and experimental studies were performed on the effect of the waterflooding development of Xinmin 23 Block in the Jilin oilfield. The evaluation results obtained were consistent with the actual oil production providing a theoretical basis for judging the accurate advance time from the waterflood front to the production well in actual oil production.

Heat transfer of film boiling on the molten metal after water injection

In-Vessel Retention (IVR) strategy with in-vessel water injection could mitigate the thermal focusing effect of the light metallic layer, and reduce the possibility of vessel failure and the release of fission products. Water injection on the molten Zirconium-Stainless steel metallic pool experiment (ATOM) has been performed to investigate the effect of water injection on the heat transfer of the molten pool. After water injection, a film boiling is formed on the top of the molten pool. With Taylor instability, a simplified model is used to derive the form of the film boiling. By fitting it with the ATOM experiment data, a new correlation of water injection on the prototype material for the possible stratified layer molten pool is obtained. The ATOM correlation could predict the experimental results well. The maximum relative error for the ATOM experiment is 28.5%, for the ELIAS experiment is 77.3%, and for the ANAIS experiment is 15.0%. By applicating the ATOM correlation of the heat transfer coefficient as a function of surface temperature to the reactor case, it is found that the vessel failure might not occur with the large aspect ratio (H/D) in the light metallic layer and with the top boundary condition of a water layer.

Effects of groundwater abstraction and desalination brine deep injection on a coastal aquifer

As a result of climate change, population increase and improvement of living standards, the water demand is annually growing drawing worldwide attention on seawater desalination to face water crisis. The total global desalination capacity is dominated by Reverse Osmosis (RO) and, often, this desalination process is fed with the brackish water extracted from coastal aquifers. After this process the desalted freshwater is obtained at a recovery factor of ca. 50%, while concentrate byproduct, named brine, is disposed back to coastal aquifers, seas, oceans or evaporative ponds, determining detrimental effects on the surrounding environment. A common approach to clean out the brine is the deep-well injection into coastal aquifers, exacerbating the seawater intrusion. The ultimate result is a reduction of the available water both in terms quantity and quality hampering the benefits of the desalination.The aim of this study is to investigate the effects of brine water injection in the Nile coastal aquifer, one of the largest underground freshwater reservoirs in the world, and to find a way to minimize and manage the environmental impact of the RO process. In order to simulate the effects of the brackish water extraction and the brine deep-injection on the Nile coastal aquifer, a combined seawater intrusion, numerical models for flow and salt transport model in aquifers and the solution-diffusion in RO practices were implemented. Different management scenarios were considered and their consequences on salt mass storage in the Nile coastal aquifer evaluated.According to the numerical results, the salinization of the coastal aquifer can be mitigated by reducing the concentration of the water feeding the reverse osmosis plant, i.e., mixing the extracted brackish water with a lower salinity water. Besides, low feed salinity leads to significant gains by decreasing the specific energy consumption of the desalination process.

Application of wireline intelligent separate-layer water injection technology in Huabei Oilfield

In order to increase the separate-layer water injection effect of heterogeneous sandstone reservoir in Huabei Oilfield, improve the qualified rate of water injection and reduce the workload of sealing, testing and adjustment, the wireline intelligent separate-layer water injection technology was used. This technology can remotely read the downhole water injection flow, temperature, pressure which was collected by the intelligent water distributor in real time on the ground. And it also can adjust the nozzle size of the intelligent water distributor in real time to make the sealing test and adjustment work easily. Up to now, there are 180 wells were implemented by wireline intelligent separate-layer water injection technology in Huabei Oilfield. This paper introduces the characteristics, key tools and construction auxiliary devices of the wireline intelligent separate-layer water injection technology. And it also evaluates the effect of the 33 wells which were implemented in the past year. The effective probability of 33 well groups is 92%, and that of corresponding wells is 83.8%. The cumulative oil increment is more than 277830 bbl and it has saved the cost of sealing test and adjustment work by 33.12 million yuan. The effect is remarkable on cost decreasing and benefit increasing. The wireline intelligent separate-layer water injection technology can improve the water flooding oil recovery effectively and it is helpful to the accurate development of oil reservoir. This technology has great value of application and popularization.