METHOD FOR DEFINING STRATUM PERMEABILITY ANISOTROPY Russian patent published in 2009 - IPC E21B47/00 

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production, particularly to oil-and-gas development projects data support. Therefore drill vertical or directional well, with a minor angle of fade in PS and perform standard complex of geophysical research in open hole. After that decent and cement a production string, create two types of perforation intervals (PI) with approximate length one tenth of (PS) depth, but not more the one metre, one by the roof of PS, another by the bottom PS. Descent tubing strings and install parker in hole clearance in the mid part of PS, dividing PS from PI for approximately equal parts. After disturb PS during not more than 5 days, by taking out from its bottom part fluid with bottomhole pressure greater then oil saturation pressure or pumping water into upper part of PS throughout hole clearance with pressure not greater than hydraulic fracturing pressure. After that measure pressure change vs. time in bottom part of PS at lower PI level, pressure in upper part of PS, in the hole clearance at upper IP level and oil and water flow rates measurements. Based on results define corrective value of equivalent coefficient permeability anisotropy, used for adaptation of 3D geo-hydrodynamic sector model in well area and its actual research data. Before well casing open hole standard research can be executed, obtaining bottomhole pressure built-up curve, using formation tester fitted on pipes in PS interval and detect its permeability value along the stratums.

EFFECT: reliability improvement and correctness in defining stratum permeability anisotropy of productive stratum (PS) using field research data.

3 cl, 4 dwg