【摘要】：水平井技術(shù)用于底水油藏開發(fā),能夠緩解底水上升現(xiàn)象。除了常規(guī)的全井段裸眼、射孔等完井方式,在此基礎(chǔ)上為了進(jìn)一步緩解底水脊進(jìn)問題,又出現(xiàn)了分段、變密度射孔等幾種完井方式,可以通過對水平井出水層段進(jìn)行有效的封堵以及合理調(diào)整底水入流剖面,從而延長有效生產(chǎn)時間。本文以不同完井方式下相關(guān)參數(shù)的優(yōu)化設(shè)計為目的,進(jìn)行水平井的產(chǎn)能評價、脊進(jìn)規(guī)律等方面的研究,為實際生產(chǎn)過程中的方案的優(yōu)化設(shè)計提供可靠的理論依據(jù)。首先,分析了不同完井方式下水平井近井流動規(guī)律,利用勢函數(shù)理論,建立油藏滲流與井筒沿程壓降耦合模型。模型考慮了油藏流體向水平井筒以及射孔孔眼中的滲流,可以進(jìn)行裸眼或射孔完井方式下全井段及分段生產(chǎn)時穩(wěn)態(tài)產(chǎn)能評價。離散后的模型在給定水平井井底流壓或產(chǎn)量的條件下進(jìn)行迭代了求解,可用于水平井穩(wěn)態(tài)時的產(chǎn)能評價及地層壓力的求取。其次,在所建立的模型基礎(chǔ)上進(jìn)行了產(chǎn)能敏感性研究,得到水平井布井方位、儲層各向異、孔密等各類參數(shù)以及水平井打開程度、分段模式等完井方式對水平井產(chǎn)能的影響,完成相關(guān)參數(shù)初步優(yōu)化。最后,考慮到底水突破對水平井有效生產(chǎn)時間的影響,利用所建立的耦合模型,并將底水上升過程考慮成垂向上的活塞式水驅(qū)油過程,建立底水脊進(jìn)模型。模型求解可計算出水平井底水突破時間,以及底水脊進(jìn)動態(tài)變化規(guī)律,進(jìn)而分析了不同完井方式下各類完井參數(shù)對底水上升規(guī)律的影響。結(jié)合產(chǎn)能分析的結(jié)果,以無水采油量為目標(biāo)函數(shù)完成了綜合優(yōu)化設(shè)計。本文的研究成果可以進(jìn)行全井段、分段裸眼完井以及全井段均勻密度、變密度、分段射孔完井方式下水平井的產(chǎn)能評價,并可以指導(dǎo)實際生產(chǎn)中相關(guān)參數(shù)的優(yōu)化設(shè)計。
[Abstract]:Horizontal well technology used in bottom water reservoir development can alleviate bottom water rise. In addition to conventional completion methods such as open hole and perforation in the whole well section, in order to further alleviate the problem of bottom water ridge entry, several completion methods, such as piecewise perforation and variable density perforation, have emerged. The effective production time can be prolonged by effectively plugging the effluent layer of horizontal well and adjusting the bottom water inflow profile reasonably. For the purpose of optimizing design of related parameters under different completion modes, this paper studies the productivity evaluation and ridge advance law of horizontal wells, which provides a reliable theoretical basis for the optimization design of practical projects in production process. Firstly, the near-well flow law of horizontal wells under different completion modes is analyzed, and the coupling model of reservoir percolation and wellbore pressure drop is established by using the potential function theory. The model considers the percolation of reservoir fluid to horizontal wellbore and perforated hole, and can be used to evaluate the steady-state productivity of the whole well section and the segmented production under the open hole or perforation completion mode. The discrete model is solved iteratively under the condition of the bottom flow pressure or production rate of horizontal well, which can be used to evaluate the productivity of horizontal well in steady state and to calculate the formation pressure. Secondly, on the basis of the established model, the productivity sensitivity is studied, and the effects of various parameters, such as horizontal well layout orientation, reservoir orientation, pore density, horizontal well opening degree and segmental completion mode, on horizontal well productivity are obtained. Complete the initial optimization of related parameters. Finally, considering the effect of water breakthrough on the effective production time of horizontal well, the coupling model is established, and the bottom water rising process is considered as a vertical piston water flooding process, and a bottom water ridge model is established. The model solution can calculate the breakthrough time of horizontal well bottom water and the dynamic change of bottom water ridge, and then analyze the influence of various completion parameters on bottom water rising law under different completion modes. Combined with the result of productivity analysis, the comprehensive optimization design was completed with the objective function of waterless oil recovery. The research results of this paper can be used to evaluate the productivity of horizontal wells in the whole well section, segmental open hole completion, uniform density, variable density, and piecewise perforation completion, and can guide the optimization design of relevant parameters in actual production.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE328;TE349

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本文編號：2198192