【摘要】：儲層砂巖破壞特征及其脆性評價對油氣田開采工程具有重要意義,針對勝利油田某油井隔層和油層砂巖巖芯,開展壓縮條件下的物理試驗及數(shù)值模擬。研究結(jié)果表明:儲層巖芯在三軸壓縮條件下的破壞模式以剪切破壞為主,同種圍壓的隔層巖芯脆性高于油層巖芯,脆性指數(shù)B較好地描述了巖芯脆性的變化趨勢;分析了儲層巖芯主要力學參數(shù)與脆性指數(shù)B的相關性,即在圍壓壓縮條件下,巖芯峰值強度、擴容點、彈性模量、泊松比、殘余強度及殘余強度系數(shù)隨脆性指數(shù)B的增加而降低,且用線性關系擬合各參數(shù)與脆性指數(shù)B的相關性較好;油層砂巖黏土礦物含量大于隔層砂巖是造成其脆性較高的內(nèi)因,單軸壓縮條件下的巖芯斷面CT掃描圖從細觀上反映了2種巖芯脆性破壞特征的不同;在單軸壓縮條件下,數(shù)值巖芯脆性隨彈性模量、壓拉比、內(nèi)摩擦角的增加而增加,隨泊松比、殘余強度系數(shù)的增加而降低,與峰值強度之間的關系不大;在聲發(fā)射模式上,儲層砂巖以前震 主震 后震型和群震型為主,根據(jù)物理試驗和數(shù)值計算結(jié)果,總結(jié)了脆性指數(shù)B與巖芯破裂聲發(fā)射模式之間的內(nèi)在關系,即在相同加載速率條件下,低脆性區(qū)、中脆性區(qū)和高脆性區(qū)巖芯聲發(fā)射模式分別為群震型、前震 主震 后震型及主震型,通過對灰?guī)r試樣和不同種類煤體聲發(fā)射模式的對比,驗證了機制討論的正確性。
[Abstract]:The failure characteristics and brittle evaluation of reservoir sandstone are of great significance to oil and gas field exploitation engineering. The physical test and numerical simulation under compression conditions are carried out for sandstone cores of a certain oil well in Shengli Oilfield. The results show that shear failure is the main failure mode of reservoir core under triaxial compression. The brittleness of interlayer core of the same confining pressure is higher than that of reservoir core, and the brittleness index B describes the change trend of core brittleness. The correlation between the main mechanical parameters of reservoir core and brittleness index B is analyzed, that is, under confining pressure compression, the peak strength, expansion point, elastic modulus and Poisson's ratio of the core are analyzed. The residual strength and residual strength coefficient decrease with the increase of brittleness index B, and the correlation between the parameters fitted by linear relation and brittleness index B is good, the clay content of sandstone in oil reservoir is larger than that of interlayer sandstone is the internal cause of its high brittleness. Under uniaxial compression condition, the CT scanning diagram of core section reflects the difference of brittle failure characteristics of two cores from meso-scale, and under uniaxial compression condition, numerical core brittleness increases with the increase of elastic modulus, compression ratio and internal friction angle. With the increase of Poisson's ratio, the residual strength coefficient decreases, but has little relation to the peak intensity. In acoustic emission mode, the reservoir sandstone is dominated by the main shock type and the swarm earthquake type, based on the results of physical test and numerical calculation. The intrinsic relationship between brittle exponent B and core rupture acoustic emission mode is summarized, that is, under the same loading rate, the core acoustic emission modes in low brittle zone, middle brittle zone and high brittle zone are swarms, respectively. By comparing the acoustic emission patterns of limestone samples with different types of coal bodies, the correctness of the discussion on the mechanism is verified.
【作者單位】： 大連理工大學海岸和近海工程國家重點實驗室;紹興文理學院土木工程學院;中國石油化工股份有限公司勝利油田分公司石油工程技術研究院;
【基金】：國家自然科學基金資助項目(51479024) 國家重點基礎研究發(fā)展計劃(973)項目(2014CB047103) 安徽省科技計劃項目(1604a0802109)~~
【分類號】：TE311

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本文編號：2210885