The remedial design for 9 5/8” intermediate casing two-stage cement job for a deep gas well in Kurdistan region

This paper discusses the remedial actions prior to performing cement job in 9 5/8" Two Stage intermediate casing at predetermined depth of (784–1540) meter R.T.K.B for a deep gas well in a gas field in Kurdistan Region-north or Iraq. In completion engineering, various tasks are required to be performed; one of these tasks is the cementing job for all casings starting from surface casing till completion the well. Therefore, an intensive casing design and cement slurries are crucial for having good cement bond behind casings. This work is carried out as a requirement for launching realistic remedial operations in intermediate casing cement job of completion engineering tasks in one of the gas fields in Iraq. The name of the field is not mentioned in this work due to the confidentiality of the publication and well is named as MF#1, which is drilled for producing natural gas (retrograde natural gas) from the depth of 1982-meter R.T.K.B. This research paper includes a brief summary to the field that is considered in this work and the valid cementing operation at the country. Followed by other sections including pre-job design of casing and cement which give detailed cement and casing design for surface 9 5/8" casing to a deep gas well. Additionally, this study indicates the reasons led to have failure in the 1st stage cement job and coming gas out to the surface from the cretaceous interval and occurring complete losses of cement and mud before and during performing the cement program. In conclusion, the outcomes of the work been done are presented from different point of views. For example, well completion configuration is required to be reassessed in a way that would lead to have good cement bond behind casing. In more worst case, the annulus between the 13 3/8" casing and 9 5/8" casing is separated from the open-hole section between 9 5/8" casing and 12.5" OH though setting a casing packer above 13 3/8" casing shoe. Finally, one of the cementing parameters that is considered as key factor for having a successful cement job, is the ECD where prior to start pumping cement, it is simulated through using CEMPRO Software through considering all affecting parameters, such as cement contamination, flow rate, losses, thickening time and cement compressive strength.