System for preventing hydrate plug formation in gas wells

Details System for preventing hydrate plug formation in gas wells System for preventing hydrate plug formation in gas wells

E - Fixed Constructions

21

B

166/3

E21B 47/06 (2006.01) E21B 33/047 (2006.01) E21B 33/068 (2006.01) E21B 33/076 (2006.01)

Patent

CA 1056716

ABSTRACT OF THE DISCLOSURE A modification is provided in an assembly for use in a well test string during oil or gas tests on exploration wells. The well has a well bore and a test string with a subsea test tree located in the vicinity of the subsea blowout preventor at the sea floor. The modified assembly in- cludes at least one line having one end in communication with a supply of methanol and the other end in communication with the test string below the sea floor. The line is substantially parallel to the test string and in- cludes the following combination: upper and lower external tubing protectors mechanically associated with the external tubing and the production string; internal porting of selected sections of the subsea test tree, thereby not interrupting the functional use of any component; a pin and box connector connecting the upper external tubing to the upper internal portion; and a lower methanol injection check valve disposed below the sea floor for ad- mitting methanol into the test string while providing a bubble-tight seal against well fluids. The invention thus provides a method of preventing hy- drate plug formation in production testing of oil and gas wells by injecting methanol into the test string of the well at any desired depth at an in- jection rate of at least 1.0 g pm.

283737

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