| 摘要: |
| H+有效传质系数是酸岩反应动力学的关键参数之一,是碳酸盐岩储层酸压设计的基础参数。目前,通常采用旋转岩盘仪或常规尺寸平行板流动实验对该参数进行测定。但是,旋转岩盘仪测试不能模拟酸液在裂缝中流动条件下的反应,而且对高黏液体测试结果存在偏差。在平行板流动实验中,若岩板尺寸短小,采用岩板质量差或者酸液浓度差来计算H+传质系数误差较大。针对现有测试方法的不足,设计了一种大尺寸岩板线性动态驱替方法测试裂缝中酸液流动反应的H+有效传质系数。在过酸前后,对大尺寸岩板进行三维激光扫描,测量出岩板过酸后的酸蚀体积,进而计算酸液消耗速度和H+有效传质系数。实验测量川西下二叠统栖霞组白云岩与胶凝酸和转向酸的H+有效传质系数介于(1.50~2.31)×10-5m/s之间。大尺寸岩板酸液H+有效传质系数测定方法为酸压裂缝模拟、酸压设计及酸压效果评价提供了更可靠的关键动力学参数。 |
| 关键词: 酸压 大尺寸岩板 酸岩反应动力学 H+有效传质系数 三维激光扫描 刻蚀体积 |
| DOI：10.3969/j.issn.1007-3426.2019.06.011 |
| 分类号: |
| 基金项目:中国石油西南油气田公司科研项目“川西深层海相碳酸盐岩储层改造机理及工艺优化研究”(20180302-02-03) |
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| A new method for testing acid effective mass transfer coefficient based on large scale rock sample |
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Liu Fei1, Luo Zhifeng2, Zhou Changlin1, Chen Xiang2, Li Li1, Rantian Shilu3, He Fei3
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1. Engineering Technology Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;2. Southwest Petroleum University, Chengdu, Sichuan, China;3. Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China
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| Abstract: |
| The effective mass transfer coefficient of hydrogen ion is an important basic parameter of acid rock reaction kinetics, and it is an essential basic parameter for acid fracturing design of carbonate reservoir. It is usually measured by rotating rock disk instrument or conventional size parallel rock plate flow test, but the rotating rock disk instrument cannot simulate the reaction of acid in the formation, and there is a deviation in the test results of high viscosity liquid. In the parallel plate flow experiment, if the size of rock plate is short, then calculating the hydrogen ion mass transfer coefficient will cause large error by using the difference of the rock plate quality or the difference of acid concentration. In this paper, a new method for measuring H+ effective mass transfer coefficient in fractures by large scale linear dynamic displacement is designed. Three-dimensional laser scanning of large size rock plates before and after peracid is carried out, and the acid etching volume of the rock plates is measured, then the acid consumption rate and H+ effective mass transfer coefficient are calculated. In this paper, the H+ effective mass transfer coefficients of gelling acid and diverting acid in the dolomite of west Sichuan permian Qixia formation are tested, which are between (1.50-2.31)×10-5 m/s. The results provide key dynamic parameters for fracture simulation, acid fracturing design and acid fracturing effect evaluation. |
| Key words: acid fracturing large scale rock sample kinetics of acid rock reaction H+ effective mass transfer coefficient laser scanner acid etched volume |
