High energy fracking device for focused shock wave generation for oil and gas recovery applications

Patent metadata

Field	Value
Publication number	US-11976543-B2
Application number	US-202017441155-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Mar 19, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

A fracking device ( 100 ) for generating shock waves in a well bore ( 102 ) comprises a fracking gun ( 110 ). The fracking gun ( 110 ) includes a cartridge ( 200 ) having a hollow cavity and a cylinder ( 202 ) disposed inside the hollow cavity of the cartridge ( 200 ). The cylinder ( 202 ) has a first chamber ( 210 ) and a second chamber ( 212 ). The first chamber ( 210 ) includes a plurality of explosive charges ( 206 ) positioned on an inner surface of the cylinder ( 202 ), wherein each of the explosive charges ( 206 ) contains an explosive mixture comprising hydrogen and stoichiometric oxygen in a predetermined ratio. The second chamber ( 212 ) contains a combustion-neutral gas. The first chamber ( 210 ) is separated from the second chamber ( 212 ) by a diaphragm ( 214 ).

First claim

I claim:

1. A fracking device for generating shock waves in a well bore, the fracking device comprising:
a fracking gun comprising:
a cartridge having a hollow cavity, an open end, and a closed end;
a cylinder disposed inside the hollow cavity of the cartridge, the cylinder having:
a first chamber comprising a plurality of explosive charges positioned on an inner surface of the cylinder, wherein each of the explosive charges contains an explosive mixture comprising hydrogen and oxygen in a predetermined ratio; and
a second chamber containing a combustion-neutral gas, the first chamber being separated from the second chamber by a diaphragm.

2. The fracking device as claimed in claim 1 , wherein the combustion-neutral gas is nitrogen.

3. The fracking device as claimed in claim 1 , wherein the fracking device comprises a coupler coupled to the open end of the cartridge, wherein the coupler is to detachably couple the fracking gun with a wire line of an external unit, wherein the coupler comprises an adapter to couple to the wire line, wherein the adapter receives signals from the wire line and supplies the signals to the cylinder, wherein the adapter isolates the wire line from the cylinder.

4. The fracking device as claimed in claim 3 , wherein the fracking gun comprises:
a detonator positioned on the inner surface of the cylinder and coupled to the explosive charges to detonate the explosive mixture therein; and
a high-pressure high temperature valve provided on a body of the cylinder to couple the adapter to the detonator.

5. The fracking device as claimed in claim 4 , wherein the adapter comprises:
an input link provided at a first end of the adapter to couple to and to receive the signals from the wire line; and
an output link provided at a second end of the adapter to couple to the high pressure high temperature valve to supply the signals to the detonator.

6. The fracking device as claimed in claim 1 , wherein a surface of the cartridge in proximity of the explosive charges forms a first region of high stress concentration, and wherein the surface of the cylinder in proximity of the explosive charges forms a second region of high stress concentration, and wherein the first region of high stress concentration overlaps the second region of high stress concentration.

7. The fracking device as claimed in claim 5 , wherein the second region of high stress concentration is in the shape of a double wedge.

8. The fracking device as claimed in claim 5 , wherein the fracking gun comprises a gyro compass to orient the double wedge shape second region of high stress concentration towards fractures present at different angles in the wellbore.

9. The fracking device as claimed in claim 1 , further comprising a locking assembly coupled to the cartridge, wherein the locking assembly comprising a nut and a spacer disposed at an interface between the nut and the cylinder, wherein the nut and the spacer are coupled to threads at the inner portion of the cartridge.

10. The fracking device as claimed in claim 9 , wherein the nut is one of a four-point nut and a six-point nut.

11. The fracking device as claimed in claim 1 , wherein the fracking gun is operated based on a solid hydrogen propellant mixture, wherein the solid hydrogen propellant mixture is loaded on a front face of an explosive part with a conical shaped liner, wherein the conical shaped liner is integrated with a propellant bonnet, wherein hydrogen gas is generated at the explosive part while firing from the propellant bonnet, and wherein an outer casing, the explosive part, the conical shaped liner are loaded with a positive-negative hydrogen mixture (PNHM) inside the propellant bonnet.

12. The fracking device as claimed in claim 11 , wherein the propellant bonnet is made of Mylar.

13. The fracking device as claimed in claim 1 , wherein the fracking device comprises a pipe holding the fracking gun.

Assignees

• Indian Institute Of Tech Madras

Inventors

• Nair Rajesh Ravi

Classifications

• E21B43/263 Primary

  using explosives · CPC title

• E21B43/117

  Shaped-charge perforators (E21B43/118 takes precedence) · CPC title

• E21B43/2605

  using gas or liquefied gas · CPC title