Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations

• US 6,041,873 A
• Filed: 10/15/1998
• Issued: 03/28/2000
• Est. Priority Date: 06/14/1993
• Status: Expired due to Fees

• Current Assignee: Weatherford/Lamb Incorporated (Weatherford International PLC)
• Original Assignee: MG Nitrogen Services Inc.
• Inventors: Michael, Keith
• Primary Examiner(s): NEUDER, WILLIAM P
• Application Number:
  US09/173,285
• Time in Patent Office: 530 Days
• Field of Search: 175/71, 95/47, 95/138
• US Class Current: 175/71
• CPC Class Codes: C08K 7/08 Oxygen-containing compounds
• CPC Class Codes: E21B 21/14 using liquids and gases, e.g. foams
• CPC Class Codes: E21B 21/16 using gaseous fluids E21B21/14 takes precedence

Abstract

A method for enhancing gas or oil production by delivering a nitrogen rich gas produced from a non-cryogenic source into the well and/or reservoir where the gas and/or oil is located.

Claims

1. Apparatus for enhancing gas or oil production from a target area selected from the group consisting of a well and a reservoir containing said gas or oil, said apparatus comprising:

a) separation means for separating at least a substantial portion of oxygen contained within a feed stream of air at a site of said target area to produce a nitrogen rich gas and an oxygen enriched waste gas;

b) delivery means for delivering the nitrogen rich gas obtained from the separation means to an injection means; and

c) said injection means for injecting the nitrogen rich gas into the target area.

2. The apparatus of claim 1 wherein the separation means comprises an air separation membrane system.

3. The apparatus of claim 2 wherein the air separation membrane system comprises a plurality of bundles of hollow fiber, semi-permeable membranes and a central core tube.

4. The apparatus of claim 1 wherein the delivery means further comprises pressure increasing means for raising the pressure of the nitrogen rich gas obtained from the separation means.

5. The apparatus of claim 1 wherein the delivery means further comprises pressure control means for controlling the pressure of the nitrogen rich gas received from the separation means.

6. The apparatus of claim 1 wherein the delivery mean further comprises flow rate control means for controlling a flow of the nitrogen rich gas received from the separation means.

7. The apparatus of claim 1 wherein the delivery means further comprises means for combining the nitrogen rich gas with a drilling fluid to reduce the density thereof.

8. The apparatus of claim 1 wherein the injection means comprises a first pathway for the nitrogen rich gas from the delivery means to the target area to combine with drill cuttings and a second pathway for the flow of nitrogen rich gas and drill cuttings upwardly and out of the target area.

9. The apparatus of claim 1 wherein the injection means further comprises means for combining the nitrogen rich gas with a drilling fluid to reduce the density of the drilling fluid.

10. The apparatus of claim 1 wherein the injection means comprises a vessel secured within the target area by a cement like material and means for injecting the nitrogen rich gas into the cement like material to improve the flow properties of the cement like material.

11. The apparatus of claim 1 wherein the injection means comprises a vessel secured within the target area, and valve means for passing the nitrogen rich gas into the vessel.

12. The apparatus of claim 1 wherein the injection means further comprises means for delivering a flow of propant to the nitrogen rich gas to form a mixture and means for delivering the mixture to the target area to embed the propant within cracks or fissures in said target area.

13. The apparatus of claim 1 wherein the separation means comprises a pressure swing adsorption system.