由地面压裂施工压力资料反求储层岩石力学参数  

DETERMINATION OF ROCK MECHANICS PARAMETERS BY PRESSURE OF SURFACE FRACTURING TREATMENT

作　　者：蒋廷学[1] 汪永利[2] 丁云宏[2] 单文文[1] 

机构地区：[1]中国石油勘探开发研究院廊坊分院,廊坊065007 [2]中国地质大学,北京100083

出　　处：《岩石力学与工程学报》2004年第14期2424-2429,共6页Chinese Journal of Rock Mechanics and Engineering

摘　　要：应用常规的地面压裂施工压力资料和前置液阶段的瞬时停泵压力测试等资料,初步探讨了求取储层原位岩石力学参数的新方法。该方法首先是由地面施工压力计算井底压力,并由井底压力的增长模式确定裂缝的扩展形态(为简单起见,文中仅假设为PKN模型和KGD模型2种)。然后,根据裂缝形态的不同,确定相应的计算公式。其实质就是利用裂缝宽度既与杨氏模量相关,又与裂缝净压力相关的特点,建立不同时间的井口压力与杨氏模量间的对应关系曲线。同时,利用泊松比与最小水平主应力的相关式,由最小主应力的变化曲线,求出了泊松比的变化曲线。经其他可靠手段验证,该方法计算结果可靠,且简单易行,便于现场推广应用。既可用于压裂的实时分析,也可用于压后评估分析。所以,该方法对提高水力压裂的优化设计水平,具有一定的参考价值。The rock mechanics parameters, such as Yang's modulus and Poisson's ratio, are determined on the basis of surface fracturing treatment pressure and instantaneous shut-in pressure during PAD stage. The first step is to calculate hole bottom pressure. Then the fracture propagation model is determined based on the curve of hole bottom pressure. In order to simplify the problem, PKN model and KGD model are utilized, and different equations are deduced for different fracture models. In essences, the relation curve of Yang's modulus and surface treatment pressure is determined based on the fact that the fracture width is not only related to Yang's modulus but also to net pressure within a fracture. The Poisson's ratio curve is also calculated out based on the curve of minimal horizontal stress which may be obtained by other reliable methods. Verified by another reliable technique, the presented new method is reliable and simplified and can be put into field applications conveniently. It can also be used to perform real time analysis as well as post-fracturing analysis.

关 键 词：石油工程 水力压裂 净压力 瞬时停泵压力 就地条件 岩石力学参数 压裂设计 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程] TE21