Combinations of API & ISO standard conventional Oilfield Country Tubular Goods (OGTC) tubing and casing combinations have 80% to 90% liquid space within the casing as shown above. Splitting and/or weakening the tubing along its axis (vertically) allows a piston to spear a whole piece of tubing within a vertically cut piece to create a Plug and Abandonment (P&A) logging and cementing space without using a drilling rig (rigless).
Proven downhole cutting wheels are available which can be connected to a skate as shown below and deployed from slickline or electric wireline. Hoisting the cutting wheels up and down can split, weaken and/or shred tubing or casing vertically.
A compressed spring extends a skate with circular cutting wheels that are rolled up and down by lifting and lowering the tool within the well, to vertically cut a tubular form within the well to either split or shred the steel tubing or casing.
The vertical cutter uses a central shaft that is pushed by a spring drive sub-assembly (not shown here) which is compressed by commercial hydrostatic actuator at a desired depth, to extend the skate that holds the cutting wheels that are rolled up-and-down to cut steel tubulars in the well.
Once the tubular is longitudinally split, a whole tubular piece can be driven into and splay the split tubular to provide at least a 50% compaction ratio. Commercially available downhole packers, which work like the tyres (tires) on your car, can be used as a piston to drive the whole tubular into the split tubular.
If you are unsure if adequate primary cement exists behind the casing, commercially available cement bond logging tools can be used within the space created by compaction to confirm the primary cementation prior to setting a cement plug. If insufficient cement exists behind the casing, the primary cementation can be placed and/or repaired.
Poor and/or missing cementation can be repaired by shredding the tubular casing with our vertical cutter to turn the longitudinal strands of casing into rebar-like steel that provides a better cement plug than can be provided by a drilling rig after milling because it retains the properties of cement but is stronger.
Vertically cutting the casing into long "guitar string" strands that are shaped like the sail of a boat cause the strands to vibrate when dense liquid like cement or cleaning liquid passes between the strings. The vibration of the strands allows cleaning liquids and cement to flow around and encase the strands to provide a clean wettable surface that cleans the area around the casing and bonds the cement to the surfaces within the well bore to provide a stronger cement plug than can be placed by a drilling rig.
The economics of our patented method benefit the Environment, Oil & Gas Operators and Services Companies because the resource cost of the method is significantly less than the present method of drilling rig abandonments. Service Companies Benefit from the Patents and are able to provide significant savings to Oil & Gas Operators by performing well abandonments in a safer, lower cost and more environmentally friendly manner. We are presently farming down our 100% interest in exchange for a per use royalty interest. Please contact us if you are interested in developing this technology in exchange for our patent rights.
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