METHOD OF CONSTRUCTION OF WELLS FOR PROSPECTING AND EXTRACTION OF FLUIDS ACCUMULATED IN FRACTURING RESERVOIRS Russian patent published in 2020 - IPC E21B7/00 E21B21/00 E21B43/02 

FIELD: construction; mining.

SUBSTANCE: invention relates to the field of well construction, and in particular to the construction of the well associated with the natural fracture type reservoirs. Method involves primary opening of the reservoir with a well using a composite drill string. Well is drilled from the drilled cuttings by the ascending flow of drilling fluid. Production string is lowered and seams are separated in its annulus space and inflow of formation fluid is stimulated. At that, primary opening of the reservoir is performed with cleaning of the well from drilled rock - sludge with drilling fluid at reverse continuous flushing. Slime samples are taken to detect characteristic minerals for filling natural cracks and to determine intervals of natural fracture clusters from these data. Data on absorption of drilling fluid or inflow of formation fluids are used to cross clusters of natural cracks with open and closed mineralized fractures. Among clusters with open cracks data on intensity of absorption of drilling fluid or inflow of reservoir fluids during drilling are allocated clusters of cracks with industrial potential, which do not need stimulation at completion of well. Clusters with low potential are identified, which need stimulation of influx at well completion. Production string is equipped with devices separating clusters of natural cracks in aforesaid column space. Influx is stimulated in intervals of clusters of mineralized cracks and clusters of open cracks with low industrial potential. Performing perforation of production string in intervals of clusters of cracks, not requiring stimulation. Then the well is developed.

EFFECT: technical result is higher efficiency of construction due to prevention of colmatation of natural cracks and targeted stimulation.

1 cl, 3 dwg