Oilfield Innovations have patented a new universal rigless P&A method of in-situ cement verification and plugging shown above, which are are similar or equivalent to other common downhole operations but costs 30% to 60% less than an offshore drilling rig P&A.
Step #1 (shown above) depicts vertically splitting in-situ production tubing to remove the strength of its circular shape, wherein the step requires qualification.
Step #2 (shown above) illustrates the “common task” of severing the tubing above the split and circulating a cleaning fluid into the annulus space between the tubing and casing.
Step #3 (depicted above) shows the “common task” of placing a mechanical plug for the subsequent packer (piston) to push against and then severing above the mechanical plug to create a tubing spear that can be pushed alongside the split tubing. Oilfield Innovations have proved the concept a tubing spear.
Step #4 (shown above) depicts the “common task” of inflating a packer in the casing and hydraulically pumping fluid into the well to push the packer (piston) downward to force the tubing spear alongside the split tubing, wherein the step of using proven inflatables packers requires qualification.
Step #5 (shown above) illustrates “common” through tubing logging measurements of the in-situ cement within the Rig-Equivalent-Window space created to measure cement bonding. Alternatively, research shows that shale or salt can also comprise an annulus barrier that can be confirmed by logging measurements.
Step #6 (depicted above) shows “common” placement of a P&A sealant (cement) plug that is supported by the compacted tubing, whereby the packer element’s casing seal prevents gas migration during sealant curing (hardening) to provide a universally compliant P&A plug.
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