Evaluation of Cementation Job Using Cement Bond Log

Abstract

Well cementing is an important process during oil and gas well drilling due role in supporting the well casing and preventing formation collapsing. Generally, there are two types of cementing process that are primary cementing and remedial cementing. The type of cement uses in oil and gas well is Portland cement mixed with improvements additives to enhance its characteristics. Various types of cements are used depends on different factors of the cemented region. This cementing process is evaluated using various methods such as ( CBL , Image, VDL, RBT , UST , RIB , URS logs ). Each one of them have its features, specifications and applications. In this paper, we evaluated the cement process for an Iraqi oil well by using CBL, Image and VDL logsy divided to two by selecting two different sections of the well; section A (depth 1780 m to 1800 m) , and section B (depth 1800 m to 1825 m). Our results show that in section A the cementing process is failed because there is no cement behind the casing (a free pipe case is available with fast formation), while section B show a good cementing process.