SHIFTING BHA FOR ISOLATION VALUE
Single trip CT below isolation valve stimulation made possible with DTI intervention solutions
The completions group of major service company approached DTI to provide a Coiled Tubing BHA to enable thru Isolation Valve stimulation of wells in Saudi Arabia. The wells featured a lower completion Isolation Valve with 2.94” ID and an upper completion minimum restriction of 2.813”.
A robust CT shifting and circulating BHA was required to pass through the upper completion, activate the Shifting Tool to open the Isolation Valve, bypass the Shifting Tool while pumping the stimulation fluids, and then reactivate the Shifting Tool to close the Isolation Valve.
A customised version of DTI’s High Expansion Hydraulic Shifting Tool was proposed to securely engage the shifting collet style profile within the Isolation Valve. Since similar Shifting Tools had previously been used, gaining approval to run the modified Shifting Tool was prompt.
To pump the stimulation through the BHA while bypassing the reduced ID of the Hydraulic Shifting Tool required a switchable Circulation Valve. Operating company concerns with indexing type Circulation Valves made a drop ball type valve the preferred option for this application. A Three-Way Circulation Valve was designed, manufactured, and tested specifically for this application.
The Three-Way Circulation Valve allows circulation only to the Shifting Tool initially. The Shifting Tool was hydraulically activated, and the Isolation Valve engaged to shift it open. After passing through the Isolation Valve with the CT, a ball was dropped and 2500PSI applied to open a circulation path to the well whilst plugging the flow path to the Shifting Tool below. After pumping the stimulation, a second ball was dropped and 3800PSI applied to return the flow path to the Shifting Tool only. The Shifting Tool was then hydraulically activated, and the Isolation Valve engaged to shift it closed.
The Service Company and National Operating Company were very happy with the performance of the BHA, and the successful intervention progressed discussions on completing more wells with similar Isolation Valves.
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DTI engineered solutions covering e-line, slickline and coiled tubing well intervention applications have supported our clients operational success for many years. Our intervention expertise and dedicated engineering, manufacturing and test capabilities enable us to deliver solutions rapidly.
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