This paper outlines how a drilling team is meeting the challenge of cementing a production liner in deep horizontal drain sections in a tight sandstone reservoir. It is intended to show how the application of existing technologies and processes is leading to performance gain and improvements in cementing quality. The full field development plan for the Khazzan project in Sultanate of Oman is based on drilling around 300 wells targeting gas producing horizons at measured depths of around 6,000m MD with 1,000m horizontal sections. target reservoirs are the Barik and Amin sandstones. Effective cement placement for zonal isolation is critical across the production liner in order to contrain fracture propagation in the correct zone. The first few attempts to cement the production liner in these wells had to overcome many challenges before finally achieving the well objectives. By looking at the complete system, rather than just the design of the cement slurry, the following critea areas were identified: - Slurry design - Mud removal and cement slurry placement - Liner hanger and float equipment Improvements have been made in each of these areas, and the result has been delivery of a succesfully optimised liner cementing design for all future horizontal wells.
Number of Pages
Looking for more?
Some of the OnePetro partner societies have developed subject- specific wikis that may help.