US 6,981,553 B2
Controlled downhole chemical injection
George Leo Stegemeier, Houston, Tex. (US); Harold J. Vinegar, Houston, Tex. (US); Robert Rex Burnett, Katy, Tex. (US); William Mountjoy Savage, Houston, Tex. (US); Frederick Gordon Carl, Jr., Houston, Tex. (US); and John Michele Hirsch, Houston, Tex. (US)
Assigned to Shell Oil Company, Houston, Tex. (US)
Appl. No. 10/220,372
PCT Filed Mar. 02, 2001, PCT No. PCT/US01/06951
§ 371(c)(1), (2), (4) Date Aug. 30, 2002,
PCT Pub. No. WO01/65055, PCT Pub. Date Sep. 07, 2001.
Claims priority of provisional application 60/177999, filed on Jan. 24, 2000.
Claims priority of provisional application 60/178000, filed on Jan. 24, 2000.
Claims priority of provisional application 60/178001, filed on Jan. 24, 2000.
Claims priority of provisional application 60/177883, filed on Jan. 24, 2000.
Claims priority of provisional application 60/177998, filed on Jan. 24, 2000.
Claims priority of provisional application 60/177997, filed on Jan. 24, 2000.
Claims priority of provisional application 60/181322, filed on Feb. 09, 2000.
Claims priority of provisional application 60/186376, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186380, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186505, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186504, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186379, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186394, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186382, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186503, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186527, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186393, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186394, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186531, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186377, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186381, filed on Mar. 02, 2000.
Claims priority of provisional application 60/186378, filed on Mar. 02, 2000.
Prior Publication US 2004/0060703 A1, Apr. 01, 2004
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 43/00 (2006.01)
U.S. Cl. 166—300 41 Claims
OG exemplary drawing
 
1. A chemical injection system for use in a well, comprising:
a current impedance device being generally configured for positioning about a portion of a piping structure of said well for supplying a time-varying electrical signal transmitted through and along said piping structure; and
an electrically controllable chemical injection device adapted to be electrically connected to said piping structure, adapted to be powered by an electrical signal, and adapted to expel a chemical in response to an electrical signal.