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

• US 5,862,869 A
• Filed: 10/06/1997
• Issued: 01/26/1999
• 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:
  US08/944,919
• Time in Patent Office: 477 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. A method for enhancing gas or oil production in which a compressed nitrogen rich gas is delivered to a target area selected from the group consisting of a well and a reservoir containing said gas or oil, the improvement comprising:

a) removing at least a substantial portion of the oxygen contained within a feed stream of air at the site of said drilling to produce a nitrogen rich gas and an oxygen enriched waste gas;

b) delivering the nitrogen rich gas to at least one of the well or the reservoir;

c) injecting the nitrogen rich gas into a drilling fluid to reduce the density of the drilling fluid; and

d) employing the drilling fluid within a downhole region of the well or reservoir.

2. The method of claim 1 comprising employing the drilling fluid containing injected nitrogen rich gas during drilling of the well.

3. The method of claim 2 wherein step a) comprises passing a feed stream of air through a membrane which preferentially separates nitrogen gas from the other gaseous components of air.

4. The method of claim 2 wherein the step of removing at least a substantial portion of oxygen comprises passing a feed stream of air through a pressure swing adsorption unit containing an absorbent which preferentially absorbs oxygen and other gases contained within the feed stream of air from the nitrogen rich gas.

5. The method of claim 2 wherein the nitrogen rich gas contains at least 85 volume percent of nitrogen.

6. The method of claim 2 wherein the nitrogen rich gas contains at least 95 volume percent of nitrogen.

7. The method of claim 2 further comprising raising the pressure of the nitrogen rich gas to at least 200 psig before delivering the nitrogen rich gas to the target area.

8. The method of claim 2 wherein the pressure of the nitrogen rich gas is raised to about 1,000 to 2,000 psig.

9. The method of claim 2 wherein the target area has at least one wall, the wall having cracks or fissures therein, said method further comprising providing a flow of a popant in a stream of the nitrogen rich gas to embed the popant within the cracks or fissures.

10. The method of claim 9 wherein the popants are selected from the group consisting of sand and glass beads.

11. The method of claim 9 further comprising treating the walls with a stream containing an acid and the nitrogen rich gas.

12. The method of claim 1 comprising:

a) removing at least a substantial portion of the oxygen contained within a feed stream of air by passing said feed stream through a membrane at the site of said drilling to produce a nitrogen rich gas and an oxygen enriched waste gas; and

b) delivering the nitrogen rich gas to the target area.