| 摘要 |
<p>1345774 Wells &c ESSO PRODUCTION RESEARCH CO 19 April 1971 [16 Feb 1970] 21921/71 Heading E1F A method for the consolidation of a subterranean incompetent formation surrounding a well bore, comprises sequentially injecting into the formation at least two mutually reactive resin-forming components, of which one component is a curing agent, and permitting them to react therein to form a solid resin, one of the reactive components being injected through a first conduit which extends from the surface to an elevation in the well bore proximate to the formation, and the other of the reactive components being subsequently injected through a second conduit which extends to a similar level in the well. The first and second conduits may be provided by a tubing string and the casing-tubing annulus respectively or by parallel tubing strings. The first component may be a liquid thermosetting resin such as a phenol-formaldehyde type resin obtained by the reaction of an aldehyde with a low molecular weight hydroxy aryl compound, an epoxy resin or a furfuryl alcohol resin. The resin may be in the form of a solution. Many curing agents, particularly organic acids and amine bases are specified. An injection procedure is described in which the well is first killed by pumping salt water down the casing, a tubing string is run, the salt water is replaced by circulating diesel oil, and a curing agent solution is pumped through the casing-tubing annulus followed by diesel oil and halted a few feet above the lower end of the tubing. An epoxy resin solution is pumped down the tubing preceded by an ethylene glycol monobutyl ether pre-flush and followed by a diesel oil after-flush, and the resin solution and curing agent solution are sequentially displaced into the formation by pumping their respective diesel oil after-flushes. A separation ball may be inserted in the stream between the diesel oil and preflush and between the preflush and resin solution.</p> |
