Patent ID: 6516861
Filing Date: 2003-02-11
Classification: E21B

Abstract:
An injection spool for use in the injection of a fluid into a wellhead assembly, the wellhead assembly having a central bore therethrough, the injection spool comprising:an outer housing having a central bore therethrough, the housing having a first end for connection to a wellhead assembly such that the central bore of the housing is aligned with the central bore of the wellhead assembly; an inner housing having a central bore therethrough, the inner housing being disposed within the central bore in the outer housing, whereby a cavity is formed between the inner housing and the outer housing; a port in the outer housing having an opening into the cavity between the inner housing and the outer housing; the inner housing having a portion extending from within the outer housing beyond the first end of the outer housing for forming a cavity within a wellhead assembly to which the injection spool is connected, the cavity thus formed connecting the cavity in the injection spool with an annular cavity defined by adjacent casings present in the wellhead assembly; the first end of the outer housing comprises a connector for connecting the spool to a wellhead assembly; the connector is for connecting the spool to a high pressure housing of a wellhead assembly; and, the portion of the inner housing extending from within the outer housing is formed to connect to a casing within the wellhead.