stresses around the well 11 have been logged using standard methods such acoustic or sonic logging at a target depth the tool 13 is oriented such that it is aligned in directions of the maximum horizontal stress it is in this direction that fractures typically open first when the whole well is pressurized in a normal fracturing operation the mounted tool 13 can be rotated by rotating the drill string 14 and thus assume any desired orientation in the well 11 making use of the conventional operation mode of the chdt tool 13 the body 20 of the tool as shown in more detail in fig2 includes a small formation drill bit 210 mounted on an internal flexible drill string 211 while the tool is kept stationary using the sealing pad 22 and counterbalancing arms not shown the flexible drill 210 can be used to drill a small side bore 212 into the formation 10 surrounding the well 11 in the example a 9 mm diameter hole 212 is drilled to an initial depth of 7 62 cm 3 in before reaching the final depth of 15 24 cm 6 in the drilling operation is monitored with real time measurements of penetration torque and weight on bit the bit is automatically frequently tripped in and out of the hole to remove cuttings the bit 210 trips can be manually repeated without drilling if a torque increase indicates a buildup of cuttings after the drilling of the side bore 212 reservoir fluids are produced to clean it of any cuttings that could adversely affect the subsequent injection after the clean out the pressure in the side bore 212.