Multi-zone formation fluid evaluation system and method for use of same

Abstract

A formation fluid evaluation system ( 100 ) interconnected within a tubular string ( 118 ) for operation in a wellbore ( 102 ) having multiple zones ( 106, 108, 110 ). The evaluation system ( 100 ) includes a pair of straddle packers ( 120, 122 ) that isolates one zone ( 108 ) of the multiple zones ( 106, 108, 110 ), a test valve ( 124 ) disposed between the straddle packers ( 120, 122 ) and an upper packer ( 126 ) positioned uphole of the uppermost zone ( 106 ) of the multiple zones ( 106, 108, 110 ). A fluid lift assembly ( 128 ) is position uphole of the upper packer ( 126 ). The fluid lift assembly ( 128 ) is operable to draw fluid ( 134 ) from the isolated zone ( 108 ) into the tubular string ( 118 ) through the test valve ( 124 ). A formation evaluation instrument ( 136 ) is disposed within the tubular string ( 118 ) and determines a characteristic of the fluid ( 134 ) received from the isolated zone ( 108 ).

1 . A formation fluid evaluation system interconnected within a tubular string for operation in a wellbore having multiple zones, the evaluation system comprising:
 a pair of straddle packers that isolates one zone of the multiple zones;   a test valve disposed between the straddle packers, the test valve receiving fluid from the isolated zone into the interior of the tubular string;   an upper packer positioned uphole of an uppermost zone of the multiple zones;   a fluid unloading assembly position uphole of the upper packer, the fluid unloading assembly operable to draw fluid from the isolated zone into the tubular string through the test valve; and   a formation evaluation instrument disposed within the tubular string that determines a characteristic of the fluid received from the isolated zone,   wherein the evaluation system is operable to sequentially isolate individual zones of the multiple zones and evaluate fluid received from the individual zones in a single trip.   
   
   
       2 . The system as recited in  claim 1  wherein the test valve further comprises a screen element. 
   
   
       3 . The system as recited in  claim 1  wherein the fluid unloading assembly further comprises a pump. 
   
   
       4 . The system as recited in  claim 3  wherein the pump is selected from a jet pump, a progressive cavity pump, a hydraulic driven piston pump, an electrical submersible pump and a syringe pump. 
   
   
       5 . The system as recited in  claim 1  wherein the fluid unloading assembly further comprises a gas lift valve. 
   
   
       6 . The system as recited in  claim 1  wherein the formation evaluation instrument is run in the tubular string on a conveyance and passes through the fluid unloading assembly. 
   
   
       7 . The system as recited in  claim 1  wherein the formation evaluation instrument further comprises at least one sensor coupled to the tubular string. 
   
   
       8 . The system as recited in  claim 1  wherein data obtained by the formation evaluation instrument relative to the characteristic of the fluid is transmitted to the surface via a conductor operably associated with the formation evaluation instrument. 
   
   
       9 . The system as recited in  claim 1  wherein data obtained by the formation evaluation instrument relative to the characteristic of the fluid is transmitted to the surface via a wireless telemetry device operably associated with the formation evaluation instrument. 
   
   
       10 . The system as recited in  claim 1  wherein the characteristic of the fluid is at least one of temperature, pressure, flow rate and fluid composition. 
   
   
       11 . The system as recited in  claim 1  further comprises a treatment valve disposed between the straddle packers, the treatment valve operable to inject fluid from the tubular string into the isolated zone. 
   
   
       12 . A method of evaluating multiple zones during a single trip into a wellbore, the method comprising:
 interconnecting a formation fluid evaluation assembly within a tubular string;   disposing the formation fluid evaluation assembly in the wellbore proximate one zone of the multiple zones and isolating the zone;   providing a seal uphole of an uppermost zone of the multiple zones;   unloading fluid from the isolated zone into the tubular string;   receiving reservoir fluid from the isolated zone into the interior of the tubular string;   determining a characteristic of the reservoir fluid received from the isolated zone; and   performing the disposing, isolating, providing, unloading, receiving and determining steps for each of the multiple zones in a single trip.   
   
   
       13 . The method as recited in  claim 12  further comprising the step of filtering the fluid entering the tubular string from the isolated zone. 
   
   
       14 . The method as recited in  claim 12  wherein the step of unloading fluid from the isolated zone into the tubular string further comprises pumping the fluid to the surface. 
   
   
       15 . The method as recited in  claim 12  wherein the step of unloading fluid from the isolated zone into the tubular string further comprises lifting the fluid to the surface. 
   
   
       16 . The method as recited in  claim 12  wherein the step of determining a characteristic of the reservoir fluid received from the isolated zone further comprises obtained data relative to the characteristic of the fluid and transmitting the data to the surface via a conductor. 
   
   
       17 . The method as recited in  claim 12  wherein the step of determining a characteristic of the reservoir fluid received from the isolated zone further comprises obtained data relative to the characteristic of the fluid and transmitting the data to the surface via wireless telemetry. 
   
   
       18 . The method as recited in  claim 12  wherein the step of determining a characteristic of the reservoir fluid received from the isolated zone further comprises determining at least one of temperature, pressure, flow rate and fluid composition. 
   
   
       19 . The method as recited in  claim 12  further comprising the step of performing a treatment operation on the isolated zone if the characteristic of the reservoir fluid received from the isolated zone matches a predetermined characteristic. 
   
   
       20 . A method of evaluating multiple zones during a single trip into a wellbore, the method comprising:
 interconnecting a formation fluid evaluation assembly within a tubular string;   disposing the formation fluid evaluation assembly in the wellbore proximate one zone of the multiple zones and isolating the zone;   providing a seal uphole of an uppermost zone of the multiple zones;   unloading fluid from the isolated zone into the tubular string;   receiving reservoir fluid from the isolated zone into the interior of the tubular string;   determining a characteristic of the reservoir fluid received from the isolated zone;   if the characteristic of the reservoir fluid received from the isolated zone matches a predetermined characteristic, then treating the isolated zone and repeating the receiving and determining step; and   performing the disposing, isolating, providing, unloading, receiving, determining and conditional treating steps for each of the multiple zones in a single trip.