酸岩反应非均匀刻蚀程度的精细定量表征 及其敏感性因素分析
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中国海洋石油集团有限公司重大科技项目“南海西部油田上产2000万方关键技术研究”课题“1 南海西部在生产油气田提高采 收率技术研究”(项目编号CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ),国家自然科学基金“纳米SiO2改性树脂防砂体多尺度界面变形 及防砂失效机理研究”(项目编号51874336)


Fine Quantitative Characterization of Inhomogeneous Etch Degree of Acid Rock Reaction and Analysis of Its Sensitivity Factors
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    摘要:

    酸压是碳酸盐岩油气藏常用的增产措施之一,裂缝壁面的非均匀刻蚀程度对酸压后导流能力以及最终增 产效果有着至关重要的影响,为实现酸蚀裂缝壁面刻蚀形态精细定量描述,引入非均匀刻蚀系数来表征非均匀 刻蚀程度。首先采用三维激光扫描仪获取酸岩反应前后岩心切片的点云数据,利用软件Geomgaic和Matlab处 理点云数据并计算表面形貌特性参数(在水平方向上选取扩展界面系数,垂直方向上选取酸蚀高度标准差系 数),取权重相加求得非均匀刻蚀系数。非均匀刻蚀程度越高,非均匀刻蚀系数越大。综合考虑不同因素对非均 匀刻蚀系数的影响,利用参数敏感性分析对影响因素进行重要程度排序,得出主次影响因素的关系:酸液浓度 (59.94%)>白云质含量(19.78%)>转速(14.08%)>温度(6.19%)。非均匀刻蚀系数的提出为精细定量表征酸 蚀裂缝非均匀刻蚀程度提供了可能,也为酸压设计指明了优化方向。

    Abstract:

    Acid fracturing is one of the commonly used measures to increase production in carbonate reservoirs. The degree of inhomogeneous etch on fracture morphology plays an important role in the conductivity and final effect of increasing production after acid fracturing. With the aim to describe the degree of inhomogeneous etch more comprehensively,the inhomogeneous etch coefficient was introduced to characterize the degree of inhomogeneous etch. Firstly,the point cloud data of core slices before and after acid rock reaction was obtained by three-dimensional laser scanner,and through the software Geomgaic and Matlab the point cloud data was processed and the surface morphology characteristic parameters was calculated furtherly,including the extended interface coefficient in the horizontal direction and the standard deviation coefficient of acid corrosion height in the vertical direction,and the inhomogeneous etch coefficient was obtained by weighted summation. The higher the degree of inhomogeneous etch,the greater the coefficient of inhomogeneous etch. Considering the influence of different factors,the factors was sorted by parameter sensitivity analysis,and the order relationship of primary and secondary influencing factors was obtained as follows: acid concentration(59.94%)>dolomite content(19.78%)>rotating speed(14.08%)>temperature(6.19%). The proposal of inhomogeneous etch coefficient can provide a possibility for fine quantitative characterization of inhomogeneous etch degree of acid etched cracks,and also point out the optimization direction for acid fracturing design.

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  • 在线发布日期: 2021-07-06
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