一种考虑多因素影响的酸压裂压力降落解释模型  

A NOVEL INTERPRETION MODEL OF PRESSURE BREAKDOWN FOR ACID FRACTURING

作　　者：高贵民 刘平礼[2] 赵立强[2] 李年银[2] 

机构地区：[1]中国石油华北油田分公司采油四厂 [2]西南石油大学"油气藏地质及开发工程"国家重点实验室

出　　处：《钻采工艺》2006年第6期64-66,72,共4页Drilling & Production Technology

摘　　要：随着油气藏压裂酸化技术的发展和应用,压后裂缝诊断、分析评估技术受到广泛重视。压力降落分析方法已经成功地应用于小型压裂测试或大型水力加砂压裂评估。但是目前针对酸压井的压后裂缝参数的诊断、评估技术和解释模型在国内还研究甚少。该方法是基于压裂施工过程和停泵后裂缝内物质平衡方程和连续性方程,结合裂缝几何参数计算模型,由压力降落变化,确定出裂缝几何尺寸、闭合压力、滤失系数等参数。在前人研究的基础上,建立了一种新的考虑多因素影响的酸压裂压力降落解释模型,由于酸液是反应性流体,滤失机理复杂,酸液滤失系数至今仍无准确的求取方法,该压力降落模型采取多次迭代的方法,避免了酸液滤失系数的直接求取,方法简单而且更趋于准确。With the development of acid fracturing technologies, the post-frac diagnostic, evaluation methods and the interpretation models became more important. However, few relevant researches have been done for acid fracturing due to the complicated leakoff mechanisms. The post-frac pressure-decline analysis method has been successfully used in small scale fracturing testing or massive hydraulic fracturing. This method was used to calculate the parameters such as fracture geometries, closure pressure, leakoff coefficient by analyzing post-frac pressure breakdown in mini-frac tests and hydraulic fracturing treatments. Based on the previous researches, this paper established a novel interpretation model of pressure breakdown in acid fracturing which took into account multi-factors effect. Since acid is a kind of reactive fluid and its leakoff mechanisms are too complicated to be accurately evaluated. To avoid the direct calculation of acid leakoff coefficient, a iteration method has been proposed in this paper to calculate pressure breakdown. The method is simple and accurate.

关 键 词：酸压 压力降落 多因素 解释模型 滤失 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]