Fiber optic measurements to evaluate fluid flow

A method, comprising:

• running a first downhole tool into a first wellbore;
• perforating the first wellbore using the first downhole tool;
• running a fiber-optic cable into the first wellbore after the first wellbore is perforated;
• varying a temperature of a treatment fluid;
• pumping the treatment fluid into the first wellbore as part of a fluid diversion process or a fluid treatment process after the first wellbore is perforated and after the temperature of the treatment fluid is varied;
• obtaining a first downhole measurement in the first wellbore using the fiber-optic cable concurrently with or after the fluid diversion process or the fluid treatment process, wherein the first downhole measurement comprises a temperature measurement at a plurality of locations along the fiber-optic cable;
• obtaining an additional measurement concurrently with obtaining the first downhole measurement, wherein the additional measurement comprises:
• a pressure measurement or a flow rate measurement obtained at a surface location;
• or
• a pressure wave measurement or a shear wave measurement obtained in a second wellbore;
• combining or comparing the first downhole measurement and the additional measurement;
• determining a location where the treatment fluid is flowing through the perforations in the first wellbore based upon the combining or comparing the first downhole measurement and the additional measurement;
• and
• varying a parameter of the treatment fluid being pumped into the first wellbore in response to determining the location where the treatment fluid is flowing, wherein the parameter comprises a pressure, a flow rate, a composition, or a combination thereof.

A system, comprising:

• a first downhole tool configured to be run into a first wellbore and to perforate the first wellbore;
• a cable configured to be run into the first wellbore and to obtain a first downhole measurement concurrently with or after a fluid diversion process or a fluid treatment process in the first wellbore, wherein the fluid diversion process or the fluid treatment process takes place after the first wellbore is perforated, and wherein the fluid diversion process or the fluid treatment process comprises pumping a treatment fluid into the first wellbore after a temperature of the treatment fluid is varied;
• a first sensor configured to obtain an additional measurement concurrently with the cable obtaining the first downhole measurement;
• and
• a processor configured to combine or compare the first downhole measurement and the additional measurement and to determine a location where the treatment fluid is flowing through perforations based upon the combining or comparing the first downhole measurement and the additional measurement.

A method, comprising:

• pumping a treatment fluid into a first wellbore as part of a fluid diversion process or a fluid treatment process
• obtaining a first downhole measurement in the first wellbore using a cable in the first wellbore or a first sensor coupled to the cable concurrently with or after the fluid diversion process or the fluid treatment process;
• obtaining one or more additional measurements concurrently with obtaining the first downhole measurement, wherein the one or more additional measurements comprise a first surface measurement obtained by a second sensor at the surface, and wherein the first surface measurement comprises pressure, flow rate, or a combination thereof;
• combining or comparing the first downhole measurement and the one or more additional measurements;
• and
• determining a location where the treatment fluid is flowing through perforations in the first wellbore based upon the combining or comparing the first downhole measurement and the one or more additional measurements.

A method, comprising:

• pumping a treatment fluid into a first wellbore as part of a fluid diversion process or a fluid treatment process
• obtaining a first downhole measurement in the first wellbore using a cable in the first wellbore or a first sensor coupled to the cable concurrently with or after the fluid diversion process or the fluid treatment process;
• obtaining one or more additional measurements concurrently with obtaining the first downhole measurement, wherein the one or more additional measurements comprise a second downhole measurement obtained by a downhole tool in a second wellbore, and wherein the second downhole measurement comprises a pressure wave, a shear wave, or both;
• combining or comparing the first downhole measurement and the one or more additional measurements;
• and
• determining a location where the treatment fluid is flowing through perforations in the first wellbore based upon the combining or comparing the first downhole measurement and the one or more additional measurements.