Method for interpretation of distributed temperature sensors during wellbore treatment

A method for determining flow distribution in a formation having a wellbore formed therein, comprising:

• positioning a sensor within the wellbore, wherein the sensor provides a substantially continuous temperature monitoring along a pre-determined interval of the wellbore, and wherein the sensor generates a feedback signal representing temperature measured by the sensor;
• injecting a fluid into the wellbore and into at least a portion of the formation adjacent the interval;
• shutting-in the wellbore for a pre-determined shut-in period;
• dividing the pre-determined interval into a plurality of sub sections;
• measuring temperature characteristics of each of the sub-sections at discrete time periods;
• plotting the temperature measurements of each of the sub-sections against time;
• comparing the temperature measurements of each of the sub-sections with a theoretical measurement curve;
• fitting the theoretical curve to the measurements of each of the sub-sections;
• determining the flow distribution for the entire interval of interest;
• and
• utilizing the determined flow distribution for a subsequent treatment process.

A method for determining flow distribution in a formation having a wellbore formed therein, comprising:

• positioning a distributed temperature sensor on a fiber extending along an interval within the wellbore, wherein the distributed temperature sensor provides substantially continuous temperature monitoring along the interval, and wherein the sensor generates a feedback signal representing temperature measured by the sensor;
• injecting a fluid into the wellbore and into at least a portion of the formation adjacent the interval;
• shutting-in the wellbore for a pre-determined shut-in period;
• measuring first temperature readings during the shut-in period;
• measuring second temperature readings subsequent to the shut-in period;
• comparing the first and second temperature measurements with a theoretical measurement curve;
• and
• fitting the theoretical curve to the first or second temperature measurements to determine an inversed temperature curve for the injected fluid, an average temperature profile for the wellbore interval prior to receiving the injected fluid and an average volume curve for the injected fluid.