Stimulating wells created by underbalanced coiled tubing drilling

A method performed by a bottom hole assembly for stimulating an underbalanced coiled tubing drilled well, the bottom hole assembly coupled to a coiled tubing, the method comprising:

• drilling a wellbore in a formation using the bottom hole assembly, the bottom hole assembly comprising a drilling bit at a bottom end of the bottom hole assembly for drilling the wellbore, a hydrajetting tool up-string from the drilling bit, and a diverter between the drilling bit and the hydrajetting tool;
• determining fracturing locations using information about the formation, the information obtained from a 3D geomechanics model of the wellbore;
• positioning the hydrajetting tool at a location in the wellbore to perform perforation of the formation;
• creating a perforation in the formation using the hydrajetting tool by jetting a perforation fluid at a first temperature towards the formation;
• creating sharp fractures in the formation at the fracturing locations using the hydrajetting tool by jetting a cooling agent at a second temperature into a wellbore area covering the perforation cluster, the second temperature less than the first temperature;
• and
• propagating hydraulic fracture at the fracturing locations by injecting fracturing fluid downwards through an annulus and the coiled tubing simultaneously.

A system for stimulating an underbalanced coiled tubing drilled well, the system comprising:

• a computer configured to determine a position for a coplanar perforation of a wellbore by (i) extracting in-situ stresses and formation properties along the wellbore from a 3D geomechanics model, (ii) determining fracturing breakdown pressure along the wellbore in a landing zone, (iii) evaluating a diagenetic rock typing at the landing zone, and (iv) determining each fracturing location based on the fracturing breakdown pressure and the diagenetic rock typing;
• a bottom hole assembly comprising:
• a drilling bit residing at the end of the bottom hole assembly, the drilling bit for forming the wellbore,
• a hydrajetting tool up-string from the drilling bit, the hydrajetting tool to jet a fluid to create a coplanar perforation cluster in a formation at the determined position for the coplanar perforation, and thereafter to jet a cooling agent to cool a wellbore area that includes the coplanar perforation cluster, and
• a diverter substructure between the drilling bit and the hydrajetting tool, the diverter substructure being used to prevent fluid from flowing to the drilling bit during the perforating;
• and
• a surface structure to control the bottom hole assembly to stimulate the well using the hydrajetting tool without extracting the bottom hole assembly after drilling the wellbore.