本文選題：壓裂氣井 + 三線性流��； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：在己探明的天然氣儲(chǔ)藏中,屬于低滲透以及特低滲透的儲(chǔ)層占據(jù)了相當(dāng)大的比例,低滲透氣藏由于滲透率低,表現(xiàn)為單井產(chǎn)量低,有的氣藏不壓裂就無自然產(chǎn)能,因此,普遍采用水力壓裂等增產(chǎn)措施進(jìn)行對(duì)低滲透氣藏儲(chǔ)層進(jìn)行改造。2002年大慶油田徐家圍子地區(qū)發(fā)現(xiàn)大型的低滲透火山巖氣藏,但在此類復(fù)雜巖性儲(chǔ)層壓后產(chǎn)量預(yù)測(cè)方面,大多采用砂巖均質(zhì)氣藏壓后產(chǎn)量預(yù)測(cè)模型,與實(shí)際差別較大,而且不能準(zhǔn)確分析影響壓裂氣井產(chǎn)能的主要因素,使得深層復(fù)雜巖性氣井(尤其是開發(fā)氣井)的壓裂規(guī)模優(yōu)化缺乏依據(jù),為此,針對(duì)以上問題,本文進(jìn)行了如下工作:首先,調(diào)研了徐深氣田火山巖氣藏的基本特征,分析了三重孔隙介質(zhì)火山巖儲(chǔ)層氣井壓后流動(dòng)形態(tài),運(yùn)用橢圓流理論和三線性流理論建立了火山巖儲(chǔ)層常規(guī)達(dá)西滲流和低速非達(dá)西滲流條件下的壓裂氣井產(chǎn)量預(yù)測(cè)數(shù)學(xué)模型,給出了壓裂氣井產(chǎn)量預(yù)測(cè)的基本原理。第二,利用拉普拉斯反演及杜哈美原理,得到了火山巖儲(chǔ)層壓裂氣井產(chǎn)量隨時(shí)間變化的解析解,繪制了火山巖儲(chǔ)層壓裂氣井產(chǎn)量遞減雙對(duì)數(shù)典型曲線,討論了氣藏儲(chǔ)層氣井壓裂后產(chǎn)量遞減規(guī)律,分析了儲(chǔ)層參數(shù)及裂縫參數(shù)對(duì)氣井壓后產(chǎn)量遞減曲線的影響規(guī)律。第三,繪制了氣井壓后產(chǎn)量預(yù)測(cè)理論圖版、裂縫半長(zhǎng)以及導(dǎo)流能力優(yōu)化理論圖版,得到了不同條件下的參數(shù)優(yōu)化曲線,對(duì)裂縫半長(zhǎng)及導(dǎo)流能力進(jìn)行了優(yōu)化分析,給出了壓裂裂縫半長(zhǎng)和裂縫導(dǎo)流能力的優(yōu)選方法,利用優(yōu)化曲線對(duì)裂縫半長(zhǎng)及導(dǎo)流能力對(duì)增產(chǎn)效果的影響進(jìn)行了分析,并對(duì)實(shí)際壓裂氣井的壓裂方案進(jìn)行了優(yōu)化設(shè)計(jì)。第四,結(jié)合XYA區(qū)塊火山巖氣藏的地質(zhì)、測(cè)井和壓裂設(shè)計(jì)等有關(guān)資料,給出了火山巖氣藏儲(chǔ)層開發(fā)氣井壓裂后產(chǎn)量預(yù)測(cè)所需參數(shù)的確定方法,建立了一套適用于XYA區(qū)塊火山巖氣藏開發(fā)氣井壓后的產(chǎn)量預(yù)測(cè)方法,并用開發(fā)氣井實(shí)例對(duì)產(chǎn)量預(yù)測(cè)方法進(jìn)行了驗(yàn)證。
[Abstract]:In the proven natural gas reservoir, low permeability and ultra-low permeability reservoirs occupy a large proportion. Because of their low permeability, low permeability gas reservoirs are characterized by low single well production, and some gas reservoirs have no natural productivity without fracturing, so,Hydraulic fracturing is widely used to improve the low permeability gas reservoir. In 2002, large low permeability volcanic rock gas reservoir was discovered in Xujiaweizi area, Daqing Oilfield.Most of them adopt the prediction model of post-pressure production of sandstone homogeneous gas reservoir, which is quite different from practice, and can not accurately analyze the main factors that affect the productivity of fracturing gas well.It makes the fracturing scale optimization of deep and complex lithologic gas wells (especially development gas wells) lack the basis. In view of the above problems, this paper has carried out the following work: firstly, the basic characteristics of volcanic gas reservoirs in Xushen gas field have been investigated.In this paper, the flow pattern after gas well pressure in volcanic reservoir with triple porosity is analyzed, and the mathematical model of fracturing gas well production prediction under the condition of conventional Darcy percolation and low velocity non-Darcy percolation is established by using elliptical flow theory and trilinear flow theory.The basic principle of production prediction for fractured gas wells is given.Secondly, by using Laplacian inversion and Duhamet principle, the analytical solution of fracturing gas well production with time in volcanic rock reservoir is obtained, and the double logarithmic typical curve of production decline of fractured gas well in volcanic rock reservoir is drawn.The law of production decline after gas well fracturing in gas reservoir is discussed, and the influence of reservoir parameters and fracture parameters on production decline curve after gas well pressure is analyzed.Thirdly, the theoretical chart of prediction of production after gas well pressure is drawn, the theoretical chart of optimization of fracture half length and conductivity is drawn, the parameter optimization curves under different conditions are obtained, and the fracture half length and conductivity are optimized and analyzed.The optimum selection method of fracture half length and fracture conductivity is given. The effect of fracture half length and flow conductivity on production increase is analyzed by using the optimization curve, and the fracturing scheme of actual fracturing gas well is optimized.Fourthly, based on the geological, logging and fracturing data of volcanic gas reservoirs in XYA block, the method of determining the required parameters for prediction of production after fracturing in volcanic gas reservoirs is given.A set of production prediction methods suitable for the development of volcanic gas reservoirs in XYA block are established, and the prediction method is verified by the example of development gas wells.
【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
【分類號(hào)】：TE377

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本文編號(hào)：1769092