岩石力学特征分析技术及其在元坝气田的应用

Rock Mechanics Characteristics Analysis and Its Application to Yuanba Gas Field

元坝气田超深井的钻井工程地质环境极为复杂,导致勘探前期的完钻井机械钻速低、钻井周期长。针对元坝气田的实际工程地质条件,全面分析应用地质、物探、钻井、测井、测试等资料,综合运用地球物理分析、岩石力学物理建模、地质统计等方法,细致开展了超深井岩石力学特征分析研究,明确了元坝气田的岩石力学基础参数、岩石可钻性、地应力状态、地层压力体系等多种岩石力学特征,为形成适合元坝气田的超深井钻井提速配套技术提供了准确全面的基础信息,该技术在实际应用中取得了明显的钻井提速效果。

The wells of the Yuanba gas field are ultra deep and their drilling engineering geological environment is extremely complex, which has caused low ROP and long drilling cycle of drilled wells at the early stage of exploration. According to the actual engineering geological condition of Yuanba gas field, geological, geophysical, drilling, well logging and testing data are analyzed to carry out detailed study on the rock mechanics characteristics analysis of ultra deep wells. A variety of rock mechanics characteristics including rock mechanics parameters, rock drillability, in situ stress state and formation stress system are determined by the integrated use of methods such as geophysical analysis, physical modeling of rock mechanics and geological statistics. The rock mechanics characteristics analysis has provided accurate and comprehensive basic information for the formation of drilling speed matching technology suitable for ultra deep wells of Yuanba gas field. The improving drilling speed has been obviously achieved in the practical drilling application.