Systems and methods for detecting phases in multiphase borehole fluids

1. A method, comprising:

deploying a bottom hole assembly in a borehole on coiled tubing, the bottom hole assembly comprising a sensor, an imaging electrode and a drill bit;

drilling the borehole with the coiled tubing deployed bottom hole assembly;

circulating a drilling fluid down the coil tubing and out through the drill bit and back to the surface via an annulus between the borehole and the coil tubing;

acquiring with the sensor a first property measurement associated with a first radial portion of the borehole at a particular axial point;

acquiring with the sensor a second property measurement associated with a second radial portion of the borehole at the particular axial point;

determining based on the first and the second property measurements that the borehole comprises at the particular axial point a gas phase separated from a liquid phase;

replacing, in response to the determining, the drilling fluid with a viscous conductive pill and circulating the viscous conductive pill down the coil tubing and to the surface via the annulus to displace the gas phase from the particular axial point; and

acquiring with the imaging electrode an imaging measurement at the particular axial point as the viscous conductive pill moves to a position directly in front of the imaging electrode.

2. The method of claim 1 , wherein the first property measurement and the second property measurement are one of temperature and resistivity.

3. The method of claim 1 , comprising rotating the sensor in the borehole;

wherein the acquiring the first property measurement includes positioning the sensor adjacent to the first radial portion; and

wherein the acquiring the second property measurement includes positioning the sensor adjacent to the second radial portion.

4. The method of claim 3 , wherein the sensor is rotated at a speed of less than about five revolutions per minute and greater than about 0.05 revolutions per minute.

5. The method of claim 1 , further comprising:

acquiring a third property measurement at the particular axial point; and

determining that formation drill cuttings are located in a radial portion of borehole at the particular axial point.

6. A method, comprising:

positioning a bottom hole assembly at a particular axial point in a borehole surrounded by an underground formation, the bottom hole assembly comprising one or more sensors;

acquiring property measurements at the particular axial point via the one or more sensors;

determining that a drilling fluid occupies a first radial portion of the borehole at the particular axial point;

determining that a formation fluid occupies a second radial portion of the borehole at the particular axial point;

displacing the formation fluid from the second radial portion of the borehole by pumping a viscous pill into the borehole; and

detecting a measurement associated with the underground formation at the second radial portion as the viscous pill passes the particular axial point and displaces the formation fluid.

7. The method of claim 6 , wherein the acquiring the property measurements is performed while rotating the one or more sensors at the particular axial point in the borehole.

8. The method of claim 7 , wherein the one or more sensors are rotated at about one revolution per minute.

9. The method of claim 7 , wherein the one or more sensors are rotated at a speed of less than about five revolutions per minute and greater than about 0.05 revolutions per minute.

10. The method of claim 6 , wherein the drilling fluid has a higher electrical conductivity than the formation fluid.