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Ask an engineer why this would not stop the oil leak
Take 3x3x1/2 inch tube steel and build a rectangular frame a few inches wider than the flanges that would extend from a few inches below the bottom flange to 3 or 4 ft above the top of the leaking riser, on the bottom of the frame put 4 hydraulic cylinders on all sides pointing inward, and on the top center of the frame put a bigger hydraulic cylinder with a tapered metal plug a few inches round at the bottom to 1 or2 thousands of an inch bigger than the inside diameter of the riser, looking downward.
This outfit can be lowered over the leaking riser pipe and the bottom cylinders all activated inward to get a tight grip on the riser just below the bottom flange, after this activate the top cylinder to shove the plug into the pipe, the taper should take any deformalities out of the pipe for a tight seal. This can be done by using the underwater robots