H油田水平井分段注入壓力及工藝研究
[Abstract]:The early development of large-scale carbonate oil fields in the H area also requires a long period of stable and stable production, and the natural decline rate of the failure-type development has been high, and the failure-type development has been unable to meet the requirements of stable and stable production. The horizontal water injection well has the advantages of low injection pressure and long injection well section, can effectively supplement the energy of the formation and drive the crude oil of the oil layer, and has an important effect on improving the oil recovery of the oil reservoir and ensuring the stable and high yield of the oil field[1]. The water injection technology of horizontal well is brand-new and has the potential oil field development technology. In the process of oil field development, the water injection technology of horizontal well has a very large advantage, can increase the water injection quantity, improve the sweep volume and the oil displacement efficiency, and can also increase the pressure of the oil reservoir and improve the development effect of the oil reservoir. The research of water injection technology in horizontal well is a technical guarantee to overcome the development of large-scale carbonate water injection technology. However, the heterogeneity of the section formation is serious, the permeability of the wellbore along the horizontal well is large, the high-permeability region, the seepage resistance is small, and the flooding is often premature; the low-permeability region has the advantages of large seepage resistance, difficult water injection and poor utilization degree of the oil layer, And the water injection development effect of the horizontal well is seriously affected. In order to solve the problem of poor connectivity and heterogeneity of the oil layer at all, the water injection is to be segmented. In this paper, the characteristics of the depth of the water injection reservoir in the H field (the Nahr Umr reservoir,3600 m, Mishruf reservoir, 3000m), the injection volume (5000-10000stb), the layer thickness (average thickness of 200-300 m), the water injection and the well pattern of the oil well are more complex (directional well injection, horizontal well, directional well, and double-branch well production) and the water shortage. In order to increase the development effect of H-reservoir, to improve the recovery ratio and to carry out the research on the matching process of H-injection sea, the horizontal well section water-filling technology is studied in this paper for the condition that the well completion method has been determined in the horizontal well of the long-well section. The compatibility of the injected water with the reservoir and the fluid is studied, and the main water source type and the water quality index of the H oil field are counted according to the standard in the petroleum and natural gas industry. And different water quality standards are required for different formation conditions through core flow experiments. Due to the difference of the water quality of the water injected by the seawater and the conventional water injection, the method and the item for seawater pretreatment are summarized and summarized. The key factor of protecting oil well casing is the reasonable water injection pressure. In this paper, it is found that pipe loss and pressure loss of water nozzle are the main factors of water injection pressure loss. And the reasonable water injection pressure of the pipe column with the injection rate of 8000 bbl/ d and 6000 bbl/ d under the condition of 8000 bbl/ d and 6000 bbl/ d, respectively, is calculated by the reasonable water injection pressure formula. The Mishruf carbonate reservoir has the characteristics of deep burial depth, large thickness, strong heterogeneity, high injection quantity of single well, multiple well-and-well distance and well-type diversity of the surrounding affected oil well. Therefore, the tracer is put into the water injection well, the existence of the injected water in the oil reservoir, the direction of motion, the flow velocity, the relation between the plane and the longitudinal communication, the influence parameters, the distribution of the pore, the evaluation of the water drive effect, and the like, and the dynamic parameters of the water injection can be obtained through the follow-up monitoring. Through the comprehensive comparison and analysis and demonstration evaluation, the first pilot wells M279, M306 and M325 in the Mishruf reservoir are recommended to be the preferred tracer for the tracer. And the experiment of the tracer in the fresh water and the experiment in the seawater can find that the recommended three inorganic salt water-soluble chemical tracers are compatible with each other. According to the water injection characteristics of the horizontal well, the water injection of the horizontal well is divided into three sections from the wellhead to the formation, the relation model between the yield and the pressure difference of each section is established according to the flow characteristics of each section, and the calculation method of the injection pressure is summarized by using the principle of the node analysis. According to the theoretical formula, the water injection pressure is the pressure + total friction generated by the bottom hole pressure-liquid injection of the water injection well, and the computer model for calculating the water injection pressure in the horizontal well is developed.
【學(xué)位授予單位】:東北石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TE357.6
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