Dual downhole injection system utilizing coiled tubing

Details Dual downhole injection system utilizing coiled tubing Dual downhole injection system utilizing coiled tubing

1997-07-18

1999-03-23

Tsay, Frank

Wells

Processes

Material placed in pores of formation to treat resident...

166306, 166247, E21B 4327

Patent

active

058847014

ABSTRACT:
A dual injection system for selectively injecting a treating fluid in a predetermined treating zone (16) of a well bore hole (10) adjacent a productive zone (14) with a marker fluid injected from the annulus (36) outside a coiled tubing string (34). The coiled tubing string (34) is inserted within the well bore hole (10) and a sensor (40) is provided on the coiled tubing string (34) with a lower end portion (42) extending below the sensor (40) for the discharge of the treating fluid from the lower end (44) of the extending end portion (42). The sensor (40) senses a detectable material, such as a radioactive material, in the marker fluid injected from the annulus (36) outside the coiled tubing string (34) and may be reciprocated within the well with the coiled tubing string (34) for determining the interface (46) between the marker fluid and the treating fluid so that the treating fluid does not enter the productive zone (18). In one embodiment (FIG. 4) the productive zone (14A) is located below the treating zone (16A) and the treating fluid contains the marker to provide the marker fluid.

REFERENCES:
patent: 4625803 (1986-12-01), Walhaug et al.
patent: 4842068 (1989-06-01), Vercaemer et al.
patent: 5042297 (1991-08-01), Lessi
patent: 5318123 (1994-06-01), Venditto et al.
patent: 5361632 (1994-11-01), Magnani
patent: 5441110 (1995-08-01), Scott, III
patent: 5464059 (1995-11-01), Kristiansen
patent: 5507342 (1996-04-01), Copeland et al.

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