Method for using drilling fluid in drilling operations, drilling fluid and its use

A method for employing drilling fluid in drilling operations, the method comprising:

• (a) receiving details of a salt, with its stratigraphic composition;
• (b) evaluating the upper limit and weight required at an end of a phase;
• (c) based on the well diameter, estimating through a mass balance and desired initial salinity, estimated depth of fluid saturation, and defining initial and final weight after saturation;
• (d) confirming with a cementing project which final well extension is necessary for the fluid to be close to saturation;
• (e) confirming with simulation and the stratigraphic composition provided whether a mass balance prediction is reproduced through temperature balance and salt balance;
• (f) during operation, preparing fluid according to suggested composition and observing salinity and initial weight;
• (g) performing a formation integrity test to assess whether the final weight of the well is within the planned range, and making any necessary adjustments during drilling;
• (h) replacing well fluid and start drilling;
• (i) monitoring the evolution of the weight and salinity of the fluid during drilling, noting the increase in chlorides, sodium, potassium, calcium, and magnesium in the fluid;
• (j) performing weight control with undersaturated fluid and, if necessary to ensuring a calibrated final section with weight in a certain range, use saturated and light fluid;
• (k) temporarily circulating the undersaturated fluid itself, using an undersaturated saline fluid with no viscosity, or even fresh water to release the column;
• (l) at the end of drilling, using the combination of a low rheology fluid followed by a viscous and low salinity fluid that, when combined, promotes suspension of cuttings when forming a bed in inclined sections and to dissolve during the cleaning flow, in which column rotation to aid in removal can be combined;
• (m) maneuvering the column and providing a memory profile in LWD during removal, without circulation, to measure the calibrated well extension.