Wells – Processes – Cementing – plugging or consolidating
Patent
1991-11-04
1993-09-07
Neuder, William P.
Wells
Processes
Cementing, plugging or consolidating
166306, E21B 4324, E21B 3600
Patent
active
052420213
ABSTRACT:
The method relates to the application to a deflected well (1) of a well-known consolidation process through the polymerization in situ of a liquid substance (L) injected within a zone (2) to be consolidated through an injection pipe (5), by interaction with a reacting gas G injected thereafter. In order to limit the zone of intervention and to properly distribute the substance and the gas all over this zone, a combination of a pipe whose wall is fitted with openings (11) all over the end part thereof (5a), a confining packer (8) and a solid separation element (10) displaced in the pipe after the liquid substance by the reacting gas, which prevents any interaction of the reacting gas before it reaches the zone to be consolidated, is used. Injecting the liquid mixture comprises successive stages of circulation between the inside of pipe (5) and the annulus between the pipe and the well (1) and of forcing to have it make through the formation properly. It is generally preceded by a stage of injection of solvent products.
REFERENCES:
patent: 4565245 (1986-01-01), Mims et al.
patent: 4640359 (1987-02-01), Livesey et al.
Gadelle Claude
Lessi Jacques
Institut Francais du Pe'trole
Neuder William P.
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