Method and apparatus for providing a stream of pressurized substantially inert gas

• US 6,662,885 B2
• Filed: 10/24/2001
• Issued: 12/16/2003
• Est. Priority Date: 10/24/2001
• Status: Active Grant

• Current Assignee: Weatherford Canada Limited (Weatherford International PLC)
• Original Assignee: Precision Drilling Technology Services Group, Inc.
• Inventors: Krill, Ross Michael
• Primary Examiner(s): Neuder, William
• Assistant Examiner(s): Smith, Matthew J
• Application Number:
  US09/983,461
• Publication Number:
  US 20030075332A1
• Time in Patent Office: 783 Days
• Field of Search: 175/65, 175/66, 175/71, 166/305.1, 166/311, 507/102, 507/202
• US Class Current: 175/66
• CPC Class Codes: B01J 19/14 Production of inert gas mixtures; Use of inert gases in general
• CPC Class Codes: B01J 2219/00108 involving reactant vapours
• CPC Class Codes: C09K 8/38 Gaseous or foamed well-drilling compositions
• CPC Class Codes: F02C 3/34 with recycling of part of the working fluid, i.e. semi-closed cycles with combustion products in the closed part of the cycle
• CPC Class Codes: F02C 6/06 providing compressed gas F02C6/10 takes precedence
• CPC Class Codes: F02D 29/04 peculiar to engines driving pumps

Abstract

Disclosed is a method of producing a pressurized stream of substantially inert gas. The method comprises collecting the exhaust gases from an internal combustion engine, directing the exhaust gases into the intake of a compressor for compressing to a desired pressure, and recirculating a portion of the compressed exhaust gases back to the intake of the compressor such that the pressure of the exhaust gases within said compressor intake is maintained above atmospheric pressure. Also disclosed is an apparatus for producing a pressurized stream of substantially inert gas utilizing the described method.

Claims

1. A method of producing a pressurized stream of substantially inert gas, the method comprising:

(i) collecting the exhaust gases from an internal combustion engine;

(ii) directing said exhaust gases into the intake of a compressor, said compressor compressing said exhaust gases to a desired pressure, said internal combustion engine driving said compressor; and

,

(iii) recirculating a portion of said compressed exhaust gases back to said intake of said compressor such that the pressure of said exhaust gases within said compressor intake is maintained above atmospheric pressure.

2. The method as claimed in claim 1 including controlling the volume of recirculated compressed exhaust gases delivered to said compressor intake to increase the volumetric throughput of said compressor and increase the load on said internal combustion engine to thereby generate a volume of exhaust gases from said engine that substantially matches the input requirements of said compressor.

3. The method as claimed in claim 1 wherein the volume of said re-circulated compressed exhaust gas delivered to said compressor intake is controlled through the use of one or more valves situated within a re-circulation conduit that delivers said re-circulated compressed exhaust gases to said compressor intake.

4. The method as claimed in claim 1 including monitoring the gas pressure within said compressor intake and adjusting the flow of said re-circulated compressed exhaust gases delivered to said compressor intake in response to fluctuations in the gas pressure within said compressor intake so as to maintain the gas pressure within said intake within pre-determined levels.

5. A method of producing a pressurized stream of substantially inert gas, the method comprising:

(i) collecting the exhaust gases from a first internal combustion engine;

(ii) collecting the exhaust gases from an additional internal combustion engine and directing said exhaust gases into the intake of a compressor, said compressor compressing said exhaust gases to a desired pressure; and

,

(iii) recirculating a portion of said compressed exhaust gases back to said intake of said compressor such that the pressure of said exhaust gases within said compressor intake is maintained above atmospheric pressure.

6. The method as claimed in claim 5 wherein the volume of said re-circulated compressed exhaust gas delivered to said compressor intake is controlled through the use of one or more valves situated within a re-circulation conduit that delivers said re-circulated compressed exhaust gases to said compressor intake.

7. The method as claimed in claim 5 including monitoring the gas pressure within said compressor intake and adjusting the flow of said re-circulated compressed exhaust gases delivered to said compressor intake in response to fluctuations in the gas pressure within said compressor intake so as to maintain the gas pressure within said intake within pre-determined levels.