Abstract: A drillable oilfield tubular plug that employs clutch faces, drilling features, anti-rotation features, and composite materials to facilitate quicker drill-out operations after the plugs have been utilized.

Abstract: A slip assembly for anchoring a sealing device, such as a bridge plug, frac plug, or packer, in an oilfield tubular. The slip assembly includes a polymeric slip cone and slip stop disposed along a mandrel. Plural wedge shaped slip elements, which each have plural teeth for selectively engaging the interior circumference of the tubular, are pressure molded of powered iron that is sintered. The plural slip elements are spaced apart from each other such that the sum length of the spaces between them along the interior circumference of the tubular accounts for greater than thirty percent of the circumference. The teeth of the plural slip elements are driven against the interior circumference of the tubular when the slip cone and the slip stop are driven toward one another along the mandrel by a setting tool.

Abstract: Methods of tracing fracking liquid in oil or gas bearing formations using plural unique oligonucleotide markers. Method includes pumping the plural volumes of fracking liquid, each marked with a unique oligonucleotide, into the formation, thereby defining plural fracture zones in the formation, and, pumping fluids out of the formation while taking plural fluid samples. Then, analyzing the concentration of the unique oligonucleotides in each of the plural fluid samples, and, calculating the ratio of each of the plural volumes of fracking liquid recovered for each of the plural fluid samples according to the concentration of the unique oligonucleotides present in each of the plural samples. And, then, establishing the quantity of the plural volumes of fracking liquids removed from the plural fracture zones.

Abstract: Methods of tracing fracking liquid in oil or gas bearing formations using plural unique oligonucleotide markers. Method includes pumping the plural volumes of fracking liquid, each marked with a unique oligonucleotide, into the formation, thereby defining plural fracture zones in the formation, and, pumping fluids out of the formation while taking plural fluid samples. Then, analyzing the concentration of the unique oligonucleotides in each of the plural fluid samples, and, calculating the ratio of each of the plural volumes of fracking liquid recovered for each of the plural fluid samples according to the concentration of the unique oligonucleotides present in each of the plural samples. And, then, establishing the quantity of the plural volumes of fracking liquids removed from the plural fracture zones.

Abstract: Tracing fracking liquid in oil and gas wells using unique DNA sequences. For each of the DNA sequences, bonding to magnetic core particles, and encapsulating them with silica. Pumping the volumes of fracking liquid, each marked with one of the unique DNA sequences, into the well. Pumping fluids out of the well while taking fluid samples. For each of the plural fluid samples, gathering the silica encapsulated DNA using magnetic attraction with the magnetic core particles, dissolving away the silica shells, thereby separating the plural unique DNA sequences form the magnetic core particles, and analyzing the concentration of the unique DNA sequences in each of the plural fluid samples. Then, calculating the ratio of each of the volumes of fracking liquid recovered for each of the fluid samples, and thereby establishing the quantity of the volumes of fracking liquids removed from the fracture zones.

Abstract: Tracing fracking liquid in oil and gas wells using unique DNA sequences. For each of the DNA sequences, bonding to magnetic core particles, and encapsulating them with silica. Pumping the volumes of fracking liquid, each marked with one of the unique DNA sequences, into the well. Pumping fluids out of the well while taking fluid samples. For each of the plural fluid samples, gathering the silica encapsulated DNA using magnetic attraction with the magnetic core particles, dissolving away the silica shells, thereby separating the plural unique DNA sequences form the magnetic core particles, and analyzing the concentration of the unique DNA sequences in each of the plural fluid samples. Then, calculating the ratio of each of the volumes of fracking liquid recovered for each of the fluid samples, and thereby establishing the quantity of the volumes of fracking liquids removed from the fracture zones.

Abstract: Tracing fracking liquid in oil and gas wells using unique DNA sequences. For each of the DNA sequences, bonding to magnetic core particles, and encapsulating them with silica. Pumping the volumes of fracking liquid, each marked with one of the unique DNA sequences, into the well. Pumping fluids out of the well while taking fluid samples. For each of the plural fluid samples, gathering the silica encapsulated DNA using magnetic attraction with the magnetic core particles, dissolving away the silica shells, thereby separating the plural unique DNA sequences form the magnetic core particles, and analyzing the concentration of the unique DNA sequences in each of the plural fluid samples. Then, calculating the ratio of each of the volumes of fracking liquid recovered for each of the fluid samples, and thereby establishing the quantity of the volumes of fracking liquids removed from the fracture zones.

Abstract: Tracing fracking liquid in oil and gas wells using unique DNA sequences. For each of the DNA sequences, bonding to magnetic core particles, and encapsulating them with silica. Pumping the volumes of fracking liquid, each marked with one of the unique DNA sequences, into the well. Pumping fluids out of the well while taking fluid samples. For each of the plural fluid samples, gathering the silica encapsulated DNA using magnetic attraction with the magnetic core particles, dissolving away the silica shells, thereby separating the plural unique DNA sequences form the magnetic core particles, and analyzing the concentration of the unique DNA sequences in each of the plural fluid samples. Then, calculating the ratio of each of the volumes of fracking liquid recovered for each of the fluid samples, and thereby establishing the quantity of the volumes of fracking liquids removed from the fracture zones.

Abstract: Methods of tracing fracking liquid in oil or gas bearing formations using plural unique oligonucleotide markers. Method includes pumping the plural volumes of fracking liquid, each marked with a unique oligonucleotide, into the formation, thereby defining plural fracture zones in the formation, and, pumping fluids out of the formation while taking plural fluid samples. Then, analyzing the concentration of the unique oligonucleotides in each of the plural fluid samples, and, calculating the ratio of each of the plural volumes of fracking liquid recovered for each of the plural fluid samples according to the concentration of the unique oligonucleotides present in each of the plural samples. And, then, establishing the quantity of the plural volumes of fracking liquids removed from the plural fracture zones.