APPARATUS FOR USE IN WELLS

• US 3,746,088 A
• Filed: 09/07/1971
• Issued: 07/17/1973
• Est. Priority Date: 09/07/1971
• Status: Expired due to Term

• Current Assignee: Charles A. Haskin, Ralph S. Millhone
• Original Assignee: Charles A. Haskin, Ralph S. Millhone
• Inventors: Haskin, Charles A., Millhone, Ralph S.
• Primary Examiner(s): Brown, David H.
• Application Number:
  US05/177,933
• Time in Patent Office: 679 Days
• Field of Search: 175/14,17 166/57-59,260,270,274,300,302,313
• US Class Current: 166/59
• CPC Class Codes: E21B 36/02 using burners
• CPC Class Codes: E21B 7/14 Drilling by use of heat, e.g. flame drilling

Abstract

Apparatus for use in mixing reactive fluids in a well to supply heat to the well and including tubing strings providing two flow paths from the earth'"'"''"'"'s surface down the well to a reaction chamber. The reaction chamber has a closed lower end and an upper end connected to the tubing strings. The flow paths extend down to the lower portion of the reaction chamber to provide flow paths for reactive fluids down the chamber to the lower end thereof. Exhaust port means are formed near the upper end of the chamber to permit reaction products to be expelled from the chamber into the well.

Claims

1. Apparatus for use in mixing fluids in a well comprising first tubing means forming a flow path from the earth'"'"''"'"'s surface down a well, second tubing means concentrically arranged around said first tubing means and extending from the earth'"'"''"'"'s surface down said well, a source of a first reactant fluid connected to the upper end of said first tubing means, a source of a second reactant fluid connected to the upper end of said second tubing means, an elongated tubular reaction chamber having a closed lower end and an open upper end, means connecting the upper end of said reaction chamber with the lower end of said second tubing means, a crossover sub having two openings forming parallel flow paths therethrough located in the upper end of said reaction chamber and providing the only flow paths for flow into said reaction chamber from said first tubing means and said second tubing means, means connecting said first tubing means to the upper end of one of openings in said crossover sub, a pair of small diameter flow tubes connected to the lower ends of the openings in said crossover sub and extending in parallel relationship substantially the entire length of said reaction chamber and vent port means in the upper portion of said reaction chamber for venting reaction products from said reaction chamber to the well.

2. The apparatus of claim 1 where one of the small diameter flow tubes extends further down the reaction chamber than the other of said small diameter tubing sections.

3. The apparatus of claim 2 where check valves with adjustable spring force are connected to the small diameter flow tubes in the reaction chamber.

4. Apparatus for use in mixing N2H4 and H2O2 in a well comprising first tubing means forming a flow path for N2H4 from the earth'"'"''"'"'s surface down a well, second tubing means concentrically arranged around said first tubing means and extending from the earth'"'"''"'"'s surface down said well to form a flow path for H2O2, a source of a N2H4 connected to the upper end of said first tubing means, a source of H2O2 connected to the upper end of said second tubing means, an elongated tubular reaction chamber having a closed lower end and an open upper end, means connecting the upper end of said reaction chamber with the lower end of said second tubing means, a crossover sub having two openings forming parallel flow paths therethrough located in the upper end of said reaction chamber and providing the only flow paths for flow into said reaction chamber from said first and said second tubing means, means connecting said first tubing means to the upper end of one of said openings in said crossover sub, a pair of small diameter flow tubes connected to the lower ends of said openings in said crossover sub and extending substantially in parallel relationship the entire length of said reaction chamber and a vent port means in the upper portion of said reactioN chamber for venting reaction products from said reaction chamber to the well.

5. The apparatus of claim 4 further characterized by downwardly opening check valves with adjustable spring force in the lower ends of said small diameter flow tubes.