Deployment and interpretation of tracer technology using downhole equipment
Embodiments presented provide for a method and apparatus for downhole tracer technology. In specific embodiments, different tracers may be placed into an injection well and amounts of residual carbon dioxide saturation may be determined.
1 . A method for deployment and interpretation of tracers in a geological formation, comprising:
conveying a downhole testing apparatus to a desired elevation within a wellbore;
setting a dual-packer arrangement, defining a position to evaluate next to the wellbore;
pumping mud from an interval defined by the dual-packer arrangement;
injecting carbon dioxide into the interval defined by the dual-packer arrangement;
injecting at least one tracer carried by a volume sampling chamber of the downhole testing apparatus into the formation;
interpreting residual carbon dioxide saturation by measuring a concentration of the at least one tracer versus time;
circulating a fluid other than mud to a bottom of a drill pipe;
injecting the fluid other than mud into the interval; and
deflating the dual-packer arrangement.
2 . The method according to claim 1 , wherein the conveying of the downhole testing apparatus is by the drill pipe.
3 . The method according to claim 1 , wherein the conveying of the downhole testing apparatus is by wireline.
4 . The method according to claim 1 , further comprising:
performing at least one powerup sequence for the downhole testing apparatus after the conveying of the downhole testing apparatus to the desired elevation.
5 . The method according to claim 4 , further comprising:
verifying the elevation of the downhole testing apparatus after the performing of the at least one powerup sequence.
6 . The method according to claim 1 , further comprising:
performing a pretest of the dual-packer arrangement after the setting of the dual-packer arrangement.
7 . The method according to claim 1 , wherein a downhole circulating sub is used to convey the fluid.
8 . The method according to claim 1 , wherein the fluid is pumped from a surface elevation.
9 . The method according to claim 1 , wherein drill pipe fluid is also injected into the formation.
10 . A method for deployment and interpretation of tracers in a geological formation, comprising:
conveying a downhole testing apparatus to a desired elevation within a wellbore;
setting a dual-packer arrangement, defining a position to evaluate next to the wellbore;
pumping mud from an interval defined by the dual-packer arrangement;
injecting carbon dioxide into the interval defined by the dual-packer arrangement;
removing mud from a drill pipe using a circulating sub;
closing the circulating sub;
performing a flow test of a fluid into the drill pipe;
injecting drill pipe formation water back into the interval;
injecting at least one tracer carried by a volume sampling chamber of the downhole testing apparatus into the formation;
interpreting residual carbon dioxide saturation by measuring a concentration of the at least one tracer versus time; and
conducting a test of formation fluids with the downhole testing apparatus.
11 . The method according to claim 10 , wherein the circulating sub is used to remove mud from the drill pipe, wherein a fluid is used to displace formation water, wherein the fluid used has a lower density than the formation water.
12 . The method according to claim 10 , wherein the flow test is performed in one of a balanced and an underbalanced well state.
13 . The method according to claim 10 , further comprising deflating the dual-packer arrangement.
14 . The method according to claim 13 , further comprising moving to a second desired elevation within the wellbore.
15 . The method according to claim 10 , wherein the tracer is a single well chemical tracer.
16 . The method according to claim 10 , wherein the tracer includes a biodegradable formulation.