Abstract: The present invention relates to a method of determining present-day horizontal stresses in geological formations. The method comprises dividing the received well data in a plurality of contiguous sets of data i, a set of data For each set of data i in the plurality of sets of data, determining, at least parameters Pi, a pressure in subsoil i, bi, a Biot coefficient i, ?i, a Poisson's ratio i, ??i, a vertical constraints in subsoil i, Ei, a Young's modulus i, ?i, a thermal expansion coefficient, and Ti, and a subsoil temperature i. The method further comprises, i, computing and outputting the horizontal constraints.

Abstract: A method for determining a concentration of solid particles in a drilling fluid. The method comprises determining, based on a received dimension of a section of a fracture, a plurality of wirelines each having a diameter. For each wireline, the method determines if a solid particle or a part of a fluid is in the current wireline. If it is determined that a solid particle is in the wireline, then determining whether the current wireline is sealed. These steps are reiterated. The method further comprises determining a volume of injected fluid into the fracture and comparing the determined volume with a reference to determine if a fracturing criterion is met. If the fracturing criterion is met, it is possible to modify the current concentration of solid particles.

Abstract: The present invention relates to a method of determining present-day horizontal stresses in geological formations. The method comprises dividing the received well data in a plurality of contiguous sets of data i, a set of data For each set of data i in the plurality of sets of data, determining, at least parameters Pi, a pressure in subsoil i, bi, a Biot coefficient i, ?i, a Poisson's ratio i, ??i, a vertical constraints in subsoil i, Ei, a Young's modulus i, ?i, a thermal expansion coefficient, and Ti, and a subsoil temperature. The method further comprises, i, computing and outputting the horizontal constraints.

Abstract: A method for determining a concentration of solid particles in drilling fluid, wherein the method comprises determining, based on a received dimension, a plurality-of wirelines, each determined wireline having a diameter. In addition, for each current wireline, the method comprises: determining if a solid particle or a part of a fluid is in the current wireline. If it is determined that a solid particle is in the current wireline, determining whether the current wireline is sealed; then reiterating said steps. The method further comprises determining a volume of injected fluid into the fracture and comparing said determined volume with a reference to determine if a fracturing criterion is met. If the fracturing criterion is met, it is possible to modify the current concentration of solid particles.