METHOD FOR DETERMINING FILTRATION PARAMETRES OF BOTTOMHOLE FORMATION ZONE BY METHOD OF HIGH-FREQUENCY FILTRATION PRESSURE WAVES Russian patent published in 2010 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: method for determining filtration parameters of bottom-hole formation zone by method of high-frequency filtration pressure waves involves hydrodynamic well surveying. During the survey there performed is periodic hydrodynamic high-frequency pressure outbreak in the surveyed formation by means of periodic change of flow rate. Complete cycle of surveys of one well includes surveys on row of values of action periods within the range the limits of which differ by not less than 2 orders. At that, the survey is started from minimum value of the period, change of bottom hole pressure in time is recorded with time interval of not more than 1/24 of the period, amplitude and shifts of phases of bottom hole pressure and flow rate are determined. At that, according to the method of filtration pressure waves for self-sounding of wells, there made is calculation of filtration parametres: flow capacity and complex characterising the ratio of piezoconductivity of formation to square of the well radius, and radius of sounding depth of bottomhole formation zone is determined. According to comparison of the obtained values of hydrodynamic parametres and the corresponding sounding radius, the conclusion on irregularities of bottom-hole formation zone is made.

EFFECT: improving accuracy of results of hydrodynamic surveys, reducing the time required for surveys.

2 cl, 3 dwg, 1 ex