The Stab-in cementing technique is a highly efficient method that reduces displacement volume and contamination during drilling operations. By utilizing a smaller diameter inner string of drill pipe, it displaces cement effectively, saving valuable time.
To minimize the need for drill-out of cement within the large casing, the Stab-in Shoe incorporates a plunger valve and displacement fluid in the drill pipe. This ensures precise displacement control and enhances cement quality. The reduced cement/mud interface area and high flow velocity within the drill pipe minimize contamination, while the short pumping time eliminates the need for cement retarders.
One of the key benefits of the Stab-in method is its ability to reduce cement volume. Unlike conventional displacement methods that require excess cement calculations, the Stab-in method simplifies the process by only considering the volume of the drill pipe as excess cement, eliminating the need for large plugs.
By enhancing displacement accuracy and reducing the need for drill-out, the Stab-in method significantly reduces rig time. This leads to minimized circulating, pumping, and drill-out times, ultimately improving overall operational efficiency.
Another advantage of the Stab-in method is its casing protection capabilities. The cementing pressures are confined to the drill pipe, similar to a squeeze job, providing an additional safeguard to the casing.
The Stab-in cementing equipment is available in a wide range of sizes, from 4-1/2" to 36". Additionally, the Stab-in cement Float Shoe & Collar can be customized with various combinations, including Double Valve, to meet specific requirements.
