Patent ID: 9725983
Date: 2017-08-08
CPC Classifications: E21B,F16L

Claim:
1. A method of plugging an oil pipe, comprising: locating an oil pipe which needs plugging, said pipe having an upstream end and a downstream end, wherein fluid is flowing in the pipe from the upstream end to the downstream end; then in a first step, inserting an electromagnetic oil pipe plugger (EMOPP) into the pipe, creating an annular space between the EMOPP and pipe; wherein the EMOPP is inserted into the downstream end of the pipe in an axial direction relative to the pipe through any available injection lines; wherein the EMOPP is an elongated hollow injection quill, said injection quill having an open upper end and an open lower end, and comprised of a magnetic particle collector and a stabilizer, connected to a power source; wherein the magnetic particle collector is comprised of a plurality of circumferentially spaced magnetic heads and a plurality of circumferentially spaced magnetic jaws located on the outer diameter of the EMOPP; wherein the stabilizer is comprised of a plurality of circumferentially spaced shoes located on the outer diameter of the EMOPP and spaced from the magnetic jaws; and wherein an external mechanical band fastener is attached to the outer diameter of the open upper end of the EMOPP, to additionally secure the EMOPP to the oil pipe; in a second step, the magnetic jaws and the stabilizer are activated, causing the magnetic jaws and the stabilizer shoes to be pushed outward into a gripping engagement with the inner diameter of the oil pipe against pressure forces acting thereon; in a third step, the magnetic heads are activated causing the magnetic heads to be pushed radially outward into a gripping engagement with the inner diameter of the oil pipe against pressure forces acting thereon, thereby creating an intense magnetic field in the annular space; in a fourth step which involves a first injection, a slurry carrier comprised of medium to small ferrous particles, steel wool and rubber pads to act as a shock absorber, and packed with an electromagnetic chemical adhesive mixture, is inserted into the EMOPP via an insertion valve; where the electromagnetic chemical adhesive mixture is a two-part epoxy; wherein the slurry carrier is injected through the EMOPP into the oil pipe, exits the upstream end of the EMOPP thereby accumulating in the annular space, and is trapped by the magnetic field and then is bound by the electromagnetic chemical adhesive mixture; in a fifth step which involves a second injection, injecting a cement mixture through the EMOPP at a rate sufficient to overcome the flow of the fluid in the oil pipe; and then in a sixth step, removing the EMOPP from the oil pipe.