【摘要】：異常高壓氣藏中一般存在大尺度裂縫和高滲夾層,它們構(gòu)成了邊底水的快速流動通道,導致氣井出現(xiàn)大量產(chǎn)水的現(xiàn)象。建立起能夠準確反映裂縫水竄過程的數(shù)值模型、分析儲層與生產(chǎn)因素對產(chǎn)水規(guī)律的影響、總結(jié)歸納出氣井產(chǎn)水特征,對這類氣藏地層水的控制、開發(fā)方案的優(yōu)化調(diào)整具有重要的實際意義。主要完成的工作和取得的認識如下:(1)分析了異常高壓氣藏的裂縫分布特征,并總結(jié)了有水氣藏的水侵模式以及產(chǎn)水規(guī)律影響因素;(2)針對目的層內(nèi)存在大尺度斷層、裂縫且分布不連續(xù)的特點,分析了雙重介質(zhì)、離散裂縫、局部加密、等效滲流特征四種大裂縫描述方法的優(yōu)勢與不足,并在此基礎(chǔ)上分別建立了均質(zhì)儲層模型和雙重介質(zhì)、局部加密、等效滲流特征數(shù)值模型,從描述裂縫水竄現(xiàn)象的準確性、計算成本等角度,優(yōu)選出等效滲流特征方法作為大裂縫模擬方法,建立數(shù)值模擬模型以研究具有大裂縫的異常高壓氣藏的產(chǎn)水機理。(3)建立了具有大裂縫的異常高壓氣藏數(shù)值模擬單井模型,分析了水體大小、縱向大裂縫距原始氣水界面的距離、縱向大裂縫距井水平距離、基質(zhì)與裂縫滲透率比值和應力敏感等儲層因素以及單井配產(chǎn)、射孔位置等生產(chǎn)因素對氣井產(chǎn)水規(guī)律的影響。(4)根據(jù)克拉2氣藏實際地質(zhì)資料,建立了細化的能描述大裂縫與高滲條帶的單井模型。通過生產(chǎn)測試數(shù)據(jù)的歷史擬合,分析了氣田縱向與橫向上來水方向和水侵程度;模擬水侵形成水封氣的過程,并在所得模型的基礎(chǔ)上研究了不同控水治水措施的實施效果與對產(chǎn)水規(guī)律的影響。
[Abstract]:There are generally large scale fractures and high permeability interlayers in abnormal high pressure gas reservoirs, which constitute a rapid flow channel of edge and bottom water, resulting in a large amount of water production in gas wells. A numerical model which can accurately reflect the process of fracture water channeling is established, the influence of reservoir and production factors on water production law is analyzed, the characteristics of water production in gas wells are summarized, and the control of formation water in this kind of gas reservoir is summarized. The optimization and adjustment of the development scheme is of great practical significance. The main works and understandings obtained are as follows: (1) the distribution characteristics of fractures in abnormal high pressure gas reservoirs are analyzed, and the water invasion patterns of water-bearing gas reservoirs and the influencing factors of water production are summarized. (2) aiming at the existence of large-scale faults in the target layer, In this paper, the advantages and disadvantages of four methods for describing large fractures, such as double medium, discrete fracture, local infill, equivalent seepage characteristic, are analyzed, and the homogeneous reservoir model and dual medium are established on the basis of the characteristics of fracture and discontinuous distribution. Based on the numerical model of local infill and equivalent seepage characteristics, the equivalent seepage characteristic method is selected as the simulation method of large fracture from the angles of accuracy and calculation cost of describing the phenomenon of fracture water channeling. A numerical simulation model is established to study the water production mechanism of abnormal high pressure gas reservoirs with large fractures. (3) the single well model of abnormal high pressure gas reservoirs with large fractures is established, and the size of water body and the distance between longitudinal large fractures and the original gas-water interface are analyzed. The effects of reservoir factors such as horizontal distance from longitudinal large fractures to wells, the ratio of matrix to fracture permeability, stress sensitivity, single well production and perforation location on the water production law of gas wells. (4) according to the actual geological data of Kela 2 gas reservoir. A single well model which can describe large fracture and high permeability strip is established. Through the historical fitting of production test data, the direction and degree of water invasion in longitudinal and transverse gas fields are analyzed, and the process of forming water seal by water invasion is simulated. On the basis of the model, the effect of different water control measures and its influence on water production were studied.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE37

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